KR102912322B1 - Method for manufacturing an ultra-thin, ultra-permeable microporous membrane - Google Patents

Abstract

A method for manufacturing an ultra-thin, ultra-permeable microporous membrane is provided. The ultra-thin, ultra-permeable microporous membrane is a membrane containing micropores, the membrane thickness is 5 μm or less, and the pore diameter of the micropores is 5 μm or less. The manufacturing method comprises foaming a water-based foam adhesive using a micro-nano foaming machine to obtain bubbles, and then performing a micro-concave, high-precision coating to obtain an ultra-thin, ultra-permeable microporous membrane. The water-based foam adhesive mainly consists of a water-based adhesive, a water-based foam stabilizer, a silicone resin polyether emulsion-based water-based foam stabilizer, and water. The foaming control parameters of the micro-nano foaming machine include a bubble specific gravity of 350 to 700 g/L, a stirring head operating rotation speed of 250 to 400 rpm, and a pump output of 100 to 500 L/h, the bubble diameter is 5 μm or less, and the thickness of the coating layer during micro-concave high-precision coating is 5 μm or less and not less than the diameter of the bubble. The method is simple, and the manufactured product has a thin thickness, good breathability, and excellent feather leakage prevention performance.

Description

Method for manufacturing an ultra-thin, ultra-permeable microporous membrane

The present invention belongs to the field of textile finishing and coating technology, and relates to a method for producing an ultra-thin, ultra-permeable microporous membrane.

Down jackets, down comforters, and many outdoor textiles are popular for their excellent thermal insulation. However, down fillings such as duck down, goose down, and hollow synthetic fibers can leak out of the fabric through needle holes, resulting in feather leakage, which can affect the wearability of the fabric. Conventional techniques enhance the fabric's feather leakage prevention by applying a coating layer. Here, the coating layer involves applying a layer of feather leakage prevention adhesive or PU adhesive to the fabric surface to block the gaps between fibers, preventing feathers from escaping. While the coating layer can enhance the fabric's feather leakage prevention, it can also reduce its breathability, affecting comfort. Furthermore, it can foster the growth of large amounts of bacteria in hot and humid environments, making the fabric less than ideal for wear. Furthermore, current coating methods typically employ a direct coating method, which results in a relatively thick coating that not only affects the fabric's breathability but also leaves the garment feeling relatively dull.

Recently, micro-nano foaming machines and micro-nano foaming coating technologies have been widely used in the coating industry, bringing about an environmentally friendly technological revolution in foam coating. Micro-nano foaming machines can generate micro-nano aerosol bubbles under certain conditions. Micro-nano aerosol bubbles refer to bubbles with diameters ranging from approximately 10 microns to several hundred nanometers when generated. These bubbles lie between micron and nanometer bubbles and possess physical and chemical properties not found in conventional adhesives. Micro-nano foaming technology for water-based adhesives is a recently emerging eco-friendly foaming coating technology. With the introduction and development of micro-nano foaming technology for water-based adhesives, eco-friendly water-based adhesive foaming coating technology has also been widely used, and production technology is gradually maturing. However, water-based eco-friendly ultrafine foams (less than 5 μm) and ultra-thin coatings (less than 5 μm) have long been challenging issues in the industry. If these problems can be solved, it will be possible to obtain a highly permeable, ultra-thin micro-nanoporous membrane in the form of an internal network through ultra-fine and nano-foaming, which will solve the problems that conventional fabrics have had difficulty in considering, such as excellent feather leakage prevention effect, excellent breathability, and relatively thin thickness.

The purpose of the present invention is to provide a method for manufacturing an ultra-thin, ultra-permeable microporous membrane that can solve the problems of the prior art.

To achieve the above purpose, the technical solutions adopted by the present invention are as follows.

The method for manufacturing an ultra-thin, ultra-permeable microporous membrane is to perform foaming treatment on a water-based foam adhesive using a micro-nano foaming machine to obtain bubbles, and then perform micro-concave, high-precision coating (currently, a relatively stable method of ultra-thin coating is the micro-concave, high-precision coating method, which accurately calculates the amount of liquid in the micro-concave holes and transfers it to the surface of the fabric to control the thickness) to obtain an ultra-thin, ultra-permeable microporous membrane.

On a weight basis, the water-based foam adhesive comprises 100 parts of water-based adhesive (e.g., PU, PE, PP, PET and other polymer materials), 0 to 15 parts of a functional auxiliary agent, 0.1 to 5 parts of a water-based foam stabilizer (a silicone oil-based water-based foam adhesive or a non-silicone oil-based water-based foam adhesive), 0.1 to 5 parts of a silicone resin polyether emulsion-based (MPS) water-based foam stabilizer and n parts of water, and when the functional auxiliary agent exceeds 0, the viscosity of the mixture of the water-based adhesive, the functional auxiliary agent and the water is 500 CPS, and when the functional auxiliary agent is 0, the viscosity of the mixture of the water-based adhesive and the water is 500 CPS, and n parts of water are determined by the weight parts of the components constituting the water-based foam adhesive and the viscosity of the mixture.

The foaming control parameters of the micro-nano foamer include a foam specific gravity of 350 to 700 g/L, a stirring head operating rotation speed of 250 to 400 rpm, and a pump output of 100 to 500 L/hour.

The diameter of the bubbles (in the present invention, the diameter of the bubbles is the outer diameter of the bubbles) is 5 μm or less.

In the case of fine concave high-precision coating, the thickness of the coating layer is less than 5 μm and greater than the diameter of the bubble.

An ultra-thin, ultra-permeable microporous membrane is a membrane containing micropores, the membrane thickness is 5 μm or less, and the pore diameter of the micropores is 5 μm or less.

In the prior art, the diameter of the bubbles obtained by performing a foaming process on a water-based foam adhesive using a micro-nano foaming machine is often 10 μm or more, and it is difficult to reach 10 μm or less. The present invention can achieve a bubble diameter of 5 μm or less by performing a foaming process on a water-based foam adhesive using a micro-nano foaming machine, and the main reasons are as follows.

① The present invention reasonably sets the foaming control parameters of a micro-nano foaming machine. Here, the bubble specific gravity is 350 to 700 g/L, the stirring head operating speed is 250 to 400 rpm, and the pump output is 100 to 500 L/hour. The bubble specific gravity is the ratio of gas to liquid. A large bubble specific gravity results in a small bubble diameter, while a small bubble specific gravity results in a large bubble diameter. A high stirring head operating speed results in a large amount of bubble formation, while a low stirring head operating speed results in a small amount of bubble formation. The pump output is determined by the coating demand, and the pump output required for different water-based adhesives varies. To produce pre-production samples, foaming debugging parameter tests must be performed, and small samples must be scraped for electron microscopy analysis. Mass production can only be carried out when the particle size reaches less than 5 μm.

② Add a certain amount of water-based foam stabilizer to the water-based foam adhesive, and the water-based foam adhesive can narrow the pore size of the foam, and the capacity of the water-based foam adhesive is appropriate, if the capacity is too large, the bubble diameter will be relatively small, but it may affect the hole formation, and if the capacity is too small, the bubble diameter will be relatively large.

③ A certain amount of a silicone resin polyether emulsion-based water-based foam stabilizer is added to the water-based foam adhesive, and the silicone resin polyether emulsion-based water-based foam stabilizer can control the structural stability of the bubble liquid film, and regularly distribute the surfactant molecules in the bubble liquid film, thereby providing excellent elasticity and self-restoring force to the bubbles. The silicone resin polyether emulsion-based water-based foam stabilizer has a remarkable bubble stabilization effect, is convenient to use, extends the retention time of small bubbles, and reduces the occurrence of small bubbles fusing into large bubbles, so that the diameter characteristics of the bubbles can be maintained at the micro-nano level.

Typically, the thickness of the coating layer is greater than the diameter of the bubbles. Since bubble diameters in conventional techniques are often 10 μm or more, they can only be used for simple thick coatings (e.g., 25 to 50 μm scrape coating), and ultra-thin microporous membranes with a thickness of 5 μm or less cannot be manufactured using micro-concave, high-precision coating. However, in the present invention, since the bubble diameter is 5 μm or less, an ultra-thin microporous membrane with a thickness of 5 μm or less can be manufactured using micro-concave, high-precision coating.

The coating layer of the prior art generally adopts the method of direct coating, so not only is the thickness of the coating layer relatively large, but also the feather leak-proof adhesive or PU adhesive directly penetrates into the yarn fibers of the fabric, so that the fabric may produce a swishing sound when it is stiffened and shaken. The coating layer of the present invention adopts the method of micro-concave high-precision coating, so not only is the thickness of the coating layer relatively thin, but also the water-based adhesive does not excessively penetrate into the yarn fibers of the fabric, so that the fabric is soft and comfortable, and the muting effect is better.

A desirable technical solution is:

The method for manufacturing the ultra-thin, super-permeable microporous membrane as described above is such that the membrane thickness is 0.5 to 5 μm, the pore diameter of the micropores is 0.1 to 5 μm, the breathability of the membrane conforms to the national standard according to the standard detection of GB/T 5453 <Test of Breathability of Textile Fabrics>, the feather leakage prevention performance of the membrane conforms to the national standard according to the standard detection of GB/T14272-2011 <Down Clothing>, and the membrane has excellent muting effect and does not make any sound when rubbed. The length of natural fibers such as cotton and wool is about 1,000 to 3,000 times its diameter, and the length of cotton fiber is 1 to 5 cm, and the diameter is about 20 μm. Silk is the thinnest natural fiber, with a cross-sectional diameter of about 10 μm, and the fineness range of cashmere fibers is very narrow (13 to 19 μm), and cashmere fibers with a fineness of 14 μm or less basically do not exceed 30 mm in length, and the diameter of down used in down jackets has a high air content and low breathability. Down is generally made from duck or goose breast feathers, and since the average diameter of down fibers is larger than 5 μm, the micropores of the present invention having a pore diameter of 5 μm or less have excellent feather leakage prevention performance.

In the method for manufacturing the ultra-thin, ultra-permeable microporous membrane described above, the micro-concave high-precision coating is used in a high-precision micro-concave coating machine in which the membrane formation is uniform, the membrane surface is uniform, and there is no blind spot in the coating membrane when the coating layer thickness is 1 to 5 μm.

In the aforementioned method for manufacturing an ultra-thin, ultra-permeable microporous membrane, the target of the micro-concave, high-precision coating is a base fabric or base film. Generally, when a membrane is to be coated on the surface of a fabric, the fabric is referred to as a "base fabric." When a membrane is coated on a base membrane with a peeling effect and then peeled off, the base membrane is referred to as a "base film."

In the above-described method for manufacturing an ultra-thin, ultra-permeable microporous membrane, prior to the high-precision micro-concave coating, an electron beam irradiation treatment is further performed on the base fabric or base film. The purpose is to improve the water-based adhesive grafting ability of the surface of the base fabric or base film, so that the surface of the base fabric or base film actively absorbs the water-based adhesive, thereby solving the problems of difficulty in high-precision transfer of the liquid micron membrane from the micro-concave coating roller to the base fabric or base film and difficulty in maintaining static stability of the liquid micron membrane. Bubbles from a foaming machine are applied to the surface of the base fabric or base film, and the transverse uniformity is a key factor affecting the quality of the coating layer. A key factor in determining the uniformity of the application is that the bubbles must align with the transverse path of the base fabric or base film, because the bubbles constantly decay over time. If the paths are not aligned, the concentration of bubbles flowing to the surface of the base fabric or base film will be inconsistent, resulting in inconsistent adhesive transport and unstable coating quality. The present invention effectively ensures the stability of coating quality by performing electron beam irradiation scanning treatment on a base fabric or base film.

In the method for manufacturing the ultra-thin, ultra-permeable microporous membrane described above, the base fabric is an ultra-fine filament fabric that has undergone calendering (such as an ultra-fine, ultra-thin sponge, nylon taffeta, etc.). Since the fabric surface is a fabric surface, there is an ups and downs in the fabric surface where the warp and weft yarns intersect. If the ups and downs are large, there is more adhesive in the concave portion and less adhesive in the protruding portion. Considering that the unevenness of the ultra-fine filament fabric surface is small, the present invention preferably uses it as a base fabric, and at the same time, in order to minimize the adverse effect of the uneven structure of the fabric surface on the smoothness of the coating, the present invention performs a calendering process on the ultra-fine filament fabric to reduce the uneven structure of the fabric surface.

In the method for manufacturing the ultra-thin, ultra-permeable microporous membrane described above, in the calender employed for calendering, the rollers in contact with the base fabric are high-precision mirror alloy rollers, and the support rollers are highly flat rubber rollers. The calender is preferably a machine with high-precision intelligent temperature control and pressure control functions, and at the same time, photoelectric induction is used to synchronously control the linear speed of each contact roller surface and the linear speed of each roller, so that the ultra-fine membrane only receives pressure on the vertical surface during calendering.

In the above-described method for producing an ultra-thin, ultra-permeable microporous membrane, after the micro-concave, high-precision coating, hot pressing or cold pressing is further performed on the coating layer surface of the base fabric or the base film, the temperature of the hot pressing is lower than the melting point of the water-based adhesive (i.e., the material forming the membrane) and higher than room temperature, and at the same time does not exceed the highest temperature resistance value of the base fabric or the base film, the temperature of the cold pressing is room temperature, the pressure of the hot pressing or cold pressing is 0.5 to 1 MPa (the value indicated on the pressure gauge), and the speed of the hot pressing or cold pressing is 15 to 50 m/min. The purpose of the hot pressing or cold pressing is to form an ultra-thin membrane layer having a slow recovery property that is thinner and smoother than the original, after the micro-nano holes connected to the wall of the microporous membrane collapse and penetrate, so that an ultra-thin, highly permeable, and mute micro-nano hole membrane can be obtained. The use of hot pressing involves thermal expansion of the air within the hole, which, under the action of external pressure, penetrates the micropores, increasing air permeability. Furthermore, hot pressing collapses and penetrates some of the micropores, creating a thinner, smoother film. This alters the internal structure of the micropores, achieving ultra-thin, fractured, penetrated, and ultra-soft pores with a slow recovery effect. If temperature control during hot pressing is a concern, the process can be replaced with multiple rounds of cold pressing.

If the microporous membrane of the present invention has excellent breathability, on the one hand, the pore diameter of the micropores is relatively small, and on the other hand, the walls within the microporous membrane collapse and penetrate by connecting micro-nano holes, so the wall connections and penetration holes of the microporous membrane manufactured by the conventional method are relatively small, and the breathability is relatively poor.

In the method for manufacturing the ultra-thin, ultra-permeable microporous membrane described above, after the micro-concave, high-precision coating, a hydrophobic treatment is further performed on the coating layer of the base fabric or base film. The hydrophobic treatment may be performed by impregnating the base fabric or base film with a hydrophobic finishing agent solution and then drying, or by spraying the hydrophobic finishing agent solution onto the coating layer of the base fabric or base film and then drying. The hydrophobic finishing agent may be a fluorine-containing hydrophobic finishing agent, a carbon-containing hydrophobic finishing agent, etc., and is preferably an environmentally friendly hydrophobic finishing agent. The purpose of the hydrophobic treatment is to provide excellent waterproofing properties to the microporous membrane.

The ultra-thin, ultra-permeable microporous membrane is coated with 1 to 5 wt% of a hydrophobic finishing agent. The waterproofing level of the membrane (tested according to GB/T 4745-2012 <Waterproofing Method for the Detection and Evaluation of Waterproofing Performance of Textiles>) is at least Level 4, and the water resistance of the membrane (tested according to GB/T 4744-2013 <Hydrostatic Method for the Detection and Evaluation of Waterproofing Performance of Textiles>) is at least 5 kPa.

Both hot pressing (or cold pressing) and hydrophobic treatment are performed after the micro-concave high-precision coating, and the order of the two is not limited, and hot pressing (or cold pressing) may be performed first and then hydrophobic treatment may be performed, or hydrophobic treatment may be performed first and then hot pressing (or cold pressing) may be performed.

In the above-described method for manufacturing an ultra-thin, ultra-permeable microporous membrane, after obtaining the ultra-thin, ultra-permeable microporous membrane, it must be wound. The ultra-thin, ultra-permeable microporous membrane and the base fabric or base film may be separated before being wound again, or the membrane may be wound directly without separation. The roller in the winding device that comes into contact with the ultra-thin, ultra-permeable microporous membrane is a high-precision mirror roller. The purpose is to prevent damage to the surface of the microporous membrane, and the winding device can control the winding tension, and the preferred winding device can perform tension-free winding to reduce the impact on the microporous membrane.

Beneficial effects:

(1) The present invention reasonably sets the foaming control parameters of a micro-nano foaming machine and reasonably designs the mixing method of a water-based foaming adhesive to generate bubbles having a diameter of 5 μm or less, and further manufactures an ultra-thin, ultra-permeable microporous membrane having a diameter of 5 μm or less and a micropore diameter of 5 μm or less through micro-concave, high-precision coating, thereby filling the gap in the prior art.

(2) The present invention performs hot pressing or cold pressing on the surface of the coating layer of the base fabric or base film so that the walls within the microporous membrane connect the micro-nano holes and collapse and penetrate, and then slowly recover, thereby obtaining an ultra-thin film layer that is thinner, softer, and has slow recovery properties than the original, thereby obtaining an ultra-thin, highly permeable, and mute micro-nano hole film.

(3) The present invention provides excellent water pressure resistance to a microporous membrane by performing a hydrophobic treatment on the coating layer of the base fabric or base film.

(4) The thickness of the microporous membrane of the present invention is relatively small, which reduces the dull feeling of clothing and increases the lightness of clothing. The microporous membrane of the present invention has excellent breathability, which makes the human body comfortable and increases the sweat-wicking effect, thereby improving the breathability and comfort of clothing. The microporous membrane of the present invention has excellent feather leakage prevention performance, which improves the wearing comfort of the fabric. The microporous membrane of the present invention has excellent waterproofing properties, which increases the weather resistance against bad weather such as snow and rain when the product is used outdoors, so that the user can be protected in all weathers.

(5) The ultra-thin, ultra-permeable microporous membrane of the present invention has excellent performance and has a wide range of application prospects in down jackets, outdoor products, and technologies with high breathability, feather leakage prevention, and waterproofing.

Figure 1 is a flow chart of a manufacturing process of an ultra-thin, ultra-permeable microporous membrane according to Example 1 of the present invention.
Figures 2 and 3 are SEM images of an ultra-thin, ultra-permeable microporous membrane according to Example 3 of the present invention.
Figure 4 is an SEM image of a cross-section of an ultra-thin, ultra-permeable microporous membrane according to Example 3 of the present invention.
FIG. 5 is a SEM image of a portion of an ultra-thin, ultra-permeable microporous membrane according to Example 3 of the present invention after slow recovery 24 hours after hot pressing at 100°C.

Below, the present invention is described in more detail, in combination with specific implementation methods. It should be understood that these examples are used solely to illustrate the present invention and are not intended to limit its scope. Furthermore, upon learning the teachings of the present invention, those skilled in the art will appreciate that various modifications and variations can be made to the present invention, and these equivalent forms are also within the scope defined by the appended claims of this application.

In each of the following embodiments, the order of steps (2) and (3) is not limited and can be adjusted or performed simultaneously. This does not affect the structure and performance of the final product. Steps (3) and (4) can be performed simultaneously. When performing electron beam irradiation treatment and calendar treatment on the base fabric in step (3), the electron beam irradiation treatment can be performed first and then the calendar treatment, or the calendar treatment can be performed first and then the electron beam radiation treatment. This does not affect the structure and performance of the final product. The order of steps (6) and (7) is not limited and can be adjusted or performed simultaneously. This does not affect the structure and performance of the final product.

Example 1

The method for manufacturing an ultra-thin, ultra-permeable microporous membrane is as shown in Fig. 1, and the specific steps are as follows.

(1) Preparation of raw materials;

Water-based adhesive: PU;

Functional supplements: Shanghai Houjing ( ) Colorless transparent silver nano solution, brand name AGS-WM1000A/B/C;

Mercury Foam Stabilizer: Shenzhen Guangshuyuan ( ) Polyurethane soft foam stabilizer GSYPU G-595 silicone oil;

Silicone resin polyether emulsion type water-based foam stabilizer: Shandong Yusu Chemical Co., Ltd. ) Modified silicone resin polyether fine emulsion FM-550;

water;

Base fabric: Ultra-fine filament fabric;

Hydrophobic finish: Shanghai Houzheng ( ) Colorless transparent hydrophobic coating additive SSJ-FG3/SSJ-F181;

(2) Adhesive mixing;

Based on the weight part, 100 parts by weight of a water-based adhesive, 2 parts by weight of a functional auxiliary agent, and water are mixed in an adhesive container to obtain a mixture having a viscosity of 500 CPS, and then 0.1 part of a water-based foam stabilizer and 0.5 part of a silicone resin polyether emulsion-based water-based foam stabilizer are added to the mixture to obtain a water-based foam adhesive.

(3) Base fabric treatment;

Electron beam irradiation treatment and calendar treatment are performed on a base fabric, and in a calendar used for the calendar treatment, a roller in contact with the base fabric is a high-precision mirror alloy roller, and a support roller is a high-altitude flat rubber roller.

(4) Micro-nano foaming;

The micro-nano foaming machine automatically extracts water-based foaming adhesive from the adhesive tank and then foams the water-based foaming adhesive. The foaming control parameters of the micro-nano foaming machine include a bubble specific gravity of 500 g/L, a stirring head operating rotation speed of 330 rpm, and a pump output of 150 L/hour.

The diameter of the bubbles obtained through foaming treatment is less than 5 μm and the average diameter is 3 μm.

(5) Micro-concave high-precision coating;

Micro-concave high-precision coating is used in a high-precision micro-concave coating machine with a uniform film formation, uniform film surface, and no blind spots in the coating film when the coating layer thickness is 5 μm, and the specific steps are as follows.

(5.1) Clean the material bin and select and assemble the micro-concave coating shaft: Clean the micro-concave coating material bin for production, select 150 anilox roller lines, design a micro-concave roller with a coating layer thickness of 5 μm, and install it on the material bin according to the standard work process.

(5.2) Fabric loading: The base fabric is loaded into the entire machine according to the fabric guiding direction requirement of the machine, and the product after fabric coating (i.e., ultra-thin, ultra-permeable microporous membrane) is wound at the winding point, and the roller in contact with the ultra-thin, ultra-permeable microporous membrane in the winding equipment is a high-precision mirror roller.

(5.3) Fabric coating: The product of step (4) is transferred to a micro-concave coating material tank through an adhesive transfer pipe, and the fabric coating roller is immersed, and the immersion depth is 1/4 to 1/2 of the diameter of the fabric coating roller (since the auxiliary agent in the tank is dynamic, the immersion depth is one range).

(5.4) Drying: After coating, the base fabric is transported to a 4-section oven at a speed of 50 m/min to be dried, and the temperature of the first to fourth section ovens is 100°C, 130°C, 155°C, and 155°C, respectively, according to the order in which the base fabric is introduced, and the wind speed of the first to fourth section ovens is 3 m/sec, 4 m/sec, 5 m/sec, and 5 m/sec, respectively.

(6) Hot pressing;

The coated surface of the base fabric processed in step (5) is hot pressed.

The hot pressing temperature is 155℃, the hot pressing pressure is 1MPa, and the hot pressing speed is 35m/min.

(7) Hydrophobic treatment

In step (5), the coated surface of the base fabric is hydrophobic-treated so that 8 wt% of the hydrophobic finishing agent is distributed on the ultra-thin, ultra-permeable microporous membrane.

The ultra-thin, ultra-permeable microporous membrane finally manufactured is a membrane containing micropores, the membrane thickness is 4.5 μm, the pore size of the micropores is 1 to 4 μm, and the average pore size is 2.5 μm. The air permeability of the membrane meets the national standard according to the standard test of GB/T 5453 <Test of Air Permeability of Textile Fabrics>, and the feather leakage prevention of the membrane meets the national standard according to the standard test of GB/T14272-2011 <Down Clothing>, the waterproof grade of the membrane is not less than Grade 4, and the water pressure resistance of the membrane is greater than 5 KPa.

Example 2

The method for manufacturing an ultra-thin, ultra-permeable microporous membrane is basically the same as Example 1, with the only difference being that step (6) is omitted.

The ultra-thin, ultra-permeable microporous membrane finally manufactured is a membrane containing micropores, the thickness of the membrane is 5 μm, the pore size of the micropores is 1 to 5 μm, and the average pore size is 3 μm. The air permeability of the membrane meets the national standard according to the standard test of GB/T 5453 <Test of Air Permeability of Textile Fabrics>, and the feather leakage prevention of the membrane meets the national standard according to the standard test of GB/T14272-2011 <Down Clothing>, the waterproof grade of the membrane is not less than Grade 4, and the water pressure resistance of the membrane is greater than 5 KPa.

As can be seen from comparing Examples 1 and 2, the thickness of the ultra-thin, ultra-permeable microporous membrane of Example 2 that was not subjected to hot pressing is slightly larger than that of the ultra-thin, ultra-permeable microporous membrane of Example 1 that was subjected to hot pressing, and at the same time, the touch is not as soft as that of Example 1. This is because the ultra-thin, ultra-permeable microporous membrane of Example 1 was subjected to hot pressing, and during the hot pressing process, the solid support of the holes connected to the inner wall is ruptured after the hot pressing, and a slow recovery effect appears.

Example 3

The specific steps of the method for manufacturing an ultra-thin, ultra-permeable microporous membrane are as follows.

(1) Preparation of raw materials;

Water-based adhesive: PU;

Functional supplement: Shanghai Houjing ( ) Colorless transparent silver nano solution, brand name AGS-WM1000A/B/C;

Mercury Foam Stabilizer: Shenzhen Guangshuyuan ( ) Polyurethane soft foam stabilizer GSYPU G-595 silicone oil;

Silicone resin polyether emulsion type water-based foam stabilizer: Shandong Yusu Chemical Co., Ltd. ) Modified silicone resin polyether fine emulsion FM-550;

water;

Base film: opp film;

Hydrophobic finish: Shanghai Houzheng ( ) Colorless transparent hydrophobic coating additive SSJ-FG3/SSJ-F181;

(2) Adhesive mixing;

Based on the weight part, 100 parts by weight of a water-based adhesive, 2 parts by weight of a functional auxiliary agent, and water are mixed in an adhesive container to obtain a mixture having a viscosity of 500 CPS, and then 0.1 part of a water-based foam stabilizer and 0.5 part of a silicone resin polyether emulsion-based water-based foam stabilizer are added to the mixture to obtain a water-based foam adhesive.

(3) Base film treatment;

Electron beam transfer processing is performed on the base film.

(4) Micro-nano foaming;

The micro-nano foaming machine automatically extracts water-based foaming adhesive from the adhesive tank and then foams the water-based foaming adhesive. The foaming control parameters of the micro-nano foaming machine include a bubble specific gravity of 500 g/L, a stirring head operating rotation speed of 330 rpm, and a pump output of 150 L/hour.

The diameter of the bubbles obtained through foaming treatment is less than 5 μm and the average diameter is 3 μm.

(5) Micro-concave high-precision coating;

Micro-concave high-precision coating is used in a high-precision micro-concave coating machine with a uniform film formation, uniform film surface, and no blind spots in the coating film when the coating layer thickness is 5 μm, and the specific steps are as follows.

(5.1) Clean the material bin and select and assemble the micro-concave coating shaft: Clean the micro-concave coating material bin for production, select 150 anilox roller lines, design a micro-concave roller with a coating layer thickness of 5 μm, and install it on the material bin according to the standard work process.

(5.2) Fabric loading: The base film is loaded into the entire machine according to the fabric guiding direction requirement of the machine, and the product after fabric coating (i.e., ultra-thin, ultra-permeable microporous membrane) is wound at the winding point, and the roller in contact with the ultra-thin, ultra-permeable microporous membrane in the winding equipment is a high-precision mirror roller.

(5.3) Fabric coating: The product of step (4) is transferred to a micro-concave coating material tank through an adhesive transfer pipe, and the fabric coating roller is immersed, and the immersion depth is 1/4 to 1/2 of the diameter of the fabric coating roller (since the auxiliary agent in the tank is dynamic, the immersion depth is one range).

(5.4) Drying: After coating, the base film is transported to a 4-section oven at a speed of 25 m/min to be dried, and the fabric coating is carried out in the order in which the base film is introduced, with the temperatures of the first to fourth section ovens being 100°C, 105°C, 110°C, and 110°C, respectively, and the wind speeds of the first to fourth section ovens being 3 m/sec, 4 m/sec, 5 m/sec, and 5 m/sec, respectively.

(6) Hot pressing;

The coated surface of the base film processed in step (5) is hot pressed.

The hot pressing temperature is 100℃, the hot pressing pressure is 0.8MPa, and the hot pressing speed is 25m/min.

Some SEM images of the membrane after 24 hours of hot pressing and slow recovery are shown in Fig. 5. As can be seen from the figure, there is a penetration flattening collapse effect in the pores, which can increase the flexibility, comfort, and muting effect of the membrane.

(7) Hydrophobic treatment

The coating surface of the base film processed in step (5) is subjected to hydrophobic treatment so that 8 wt% of the hydrophobic finishing agent is distributed on the ultra-thin, ultra-permeable microporous membrane.

The ultra-thin, ultra-permeable microporous membrane finally fabricated is a membrane containing micropores (as shown in Figs. 2 and 3, many micro-nano pores can be seen on the membrane surface in high-magnification electron microscope photographs, and as shown in Fig. 4, many micro-nano pores are seen in the cross-section when viewed under a high-magnification electron microscope). The thickness of the membrane is 4 μm, the pore diameter of the micropores is 1 to 4 μm, and the average pore diameter is 2 μm. The breathability of the membrane meets the national standard according to the standard test of GB/T 5453 <Test of Breathability of Textile Fabrics>, and the feather leakage resistance of the membrane meets the national standard according to the standard test of GB/T14272-2011 <Down Clothing>, and the waterproof grade of the membrane is not lower than Grade 4, and the water pressure resistance of the membrane is greater than 5 KPa.

Example 4

The specific steps of the method for manufacturing an ultra-thin, ultra-permeable microporous membrane are as follows.

(1) Preparation of raw materials;

Water-based adhesive: PE;

Functional supplements: Shanghai Houjing ( ) Colorless transparent nano zinc ion solution, brand name ZNS-WP20;

Mercury Foam Stabilizer: Jinan Guolan New Material Co., Ltd. ) F-8805 Organic silicone foam stabilizer;

Silicone resin polyether emulsion type water-based foam stabilizer: Shandong Mobeier Chemical Co., Ltd. ) Modified silicone resin polyether fine emulsion FM-550;

water;

Base film: PE film;

Hydrophobic finish: Shanghai Houzheng ( ) Colorless transparent graffiti prevention aid FTY-FG3;

(2) Adhesive mixing;

Based on the weight part, 100 parts by weight of a water-based adhesive, 2 parts by weight of a functional auxiliary agent, and water are mixed in an adhesive container to obtain a mixture having a viscosity of 500 CPS, and then 0.1 part of a water-based foam stabilizer and 0.5 part of a silicone resin polyether emulsion-based water-based foam stabilizer are added to the mixture to obtain a water-based foam adhesive.

(3) Base film treatment;

Electron beam transfer processing is performed on the base film.

(4) Micro-nano foaming;

The micro-nano foaming machine automatically extracts water-based foaming adhesive from the adhesive tank and then foams the water-based foaming adhesive. The foaming control parameters of the micro-nano foaming machine include a bubble specific gravity of 550 g/L, a stirring head operating rotation speed of 330 rpm, and a pump output of 100 L/hour.

The diameter of the bubbles obtained through foaming treatment is less than 5 μm and the average diameter is 3 μm.

(5) Micro-concave high-precision coating;

Micro-concave high-precision coating is used in a high-precision micro-concave coating machine with a uniform film formation, uniform film surface, and no blind spots in the coating film when the coating layer thickness is 5 μm, and the specific steps are as follows.

(5.1) Clean the material bin and select and assemble the micro-concave coating shaft: Clean the micro-concave coating material bin for production, select 150 anilox roller lines, design a micro-concave roller with a coating layer thickness of 5 μm, and install it on the material bin according to the standard work process.

(5.2) Fabric loading: The base film is loaded into the entire machine according to the fabric guiding direction requirement of the machine, and the product after fabric coating (i.e., ultra-thin, ultra-permeable microporous membrane) is wound at the winding point, and the roller in contact with the ultra-thin, ultra-permeable microporous membrane in the winding equipment is a high-precision mirror roller.

(5.3) Fabric coating: The product of step (4) is transferred to a micro-concave coating material tank through an adhesive transfer pipe, and the fabric coating roller is immersed, and the immersion depth is 1/4 to 1/2 of the diameter of the fabric coating roller (since the auxiliary agent in the tank is dynamic, the immersion depth is one range).

(5.4) Drying: After coating, the base film is transported to a 4-section oven at a speed of 25 m/min to be dried, and the fabric coating is carried out in the order in which the base film is introduced, with the temperatures of the first to fourth section ovens being 100°C, 105°C, 110°C, and 110°C, respectively, and the wind speeds of the first to fourth section ovens being 3 m/sec, 4 m/sec, 5 m/sec, and 5 m/sec, respectively.

(6) Cold pressing;

The coated surface of the base film processed in step (5) is cold pressed.

The cold pressing temperature is 25℃, the cold pressing pressure is 0.8MPa, and the cold pressing speed is 30m/min.

(7) Hydrophobic treatment

The coating surface of the base film processed in step (5) is subjected to hydrophobic treatment so that 8 wt% of the hydrophobic finishing agent is distributed on the ultra-thin, ultra-permeable microporous membrane.

The ultra-thin, ultra-permeable microporous membrane finally manufactured is a membrane containing micropores, the thickness of the membrane is 4 μm, the pore size of the micropores is 1 to 4 μm, and the average pore size is 2 μm. The air permeability of the membrane meets the national standard according to the standard test of GB/T 5453 <Test of Air Permeability of Textile Fabrics>, and the feather leakage prevention of the membrane meets the national standard according to the standard test of GB/T14272-2011 <Down Clothing>, the waterproof grade of the membrane is not less than Grade 4, and the water pressure resistance of the membrane is greater than 5 KPa.

Example 5

The specific steps of the method for manufacturing an ultra-thin, ultra-permeable microporous membrane are as follows.

(1) Preparation of raw materials;

Water-based adhesive: PP;

Functional supplement: Shanghai Houjing ( ) Nano titanium dioxide aqueous dispersion, trade name TIO-WPR010;

Mercury Foam Stabilizer: Jinan Guolan New Material Co., Ltd. ) F-8805 Organic silicone foam stabilizer;

Silicone resin polyether emulsion type water-based foam stabilizer: Shandong Mobeier Chemical Co., Ltd. ) Modified silicone resin polyether fine emulsion FM-550;

water;

Base film: PE film;

Hydrophobic finish: Shanghai Houzheng ( ) Colorless transparent graffiti prevention aid FTY-FG3;

(2) Adhesive mixing;

Based on the weight part, 100 parts by weight of a water-based adhesive, 1 part of a functional auxiliary agent, and water are mixed in an adhesive container to obtain a mixture having a viscosity of 500 CPS, and then 0.1 part of a water-based foam stabilizer and 0.5 part of a silicone resin polyether emulsion-based water-based foam stabilizer are added to the mixture to obtain a water-based foam adhesive.

(3) Micro-nano foaming;

The micro-nano foaming machine automatically extracts water-based foaming adhesive from the adhesive tank and then foams the water-based foaming adhesive. The foaming control parameters of the micro-nano foaming machine include a bubble specific gravity of 550 g/L, a stirring head operating rotation speed of 330 rpm, and a pump output of 200 L/hour.

The diameter of the bubbles obtained through foaming treatment is less than 5 μm and the average diameter is 3 μm.

(4) Micro-concave high-precision coating;

Micro-concave high-precision coating is used in a high-precision micro-concave coating machine with a uniform film formation, uniform film surface, and no blind spots in the coating film when the coating layer thickness is 5 μm, and the specific steps are as follows.

(4.1) Clean the material bin and select and assemble the micro-concave coating shaft: Clean the micro-concave coating material bin for production, select 150 anilox roller lines, design a micro-concave roller with a coating layer thickness of 5 μm, and install it on the material bin according to the standard work process.

(4.2) Fabric loading: The base film is loaded into the entire machine according to the fabric guiding direction requirement of the machine, and the product after fabric coating (i.e., ultra-thin, ultra-permeable microporous membrane) is wound at the winding point, and the roller in contact with the ultra-thin, ultra-permeable microporous membrane in the winding equipment is a high-precision mirror roller.

(4.3) Fabric coating: The product of step (3) is transferred to a micro-concave coating material tank through an adhesive transfer pipe, and the fabric coating roller is immersed, and the immersion depth is 1/4 to 1/2 of the diameter of the fabric coating roller (since the auxiliary agent in the tank is dynamic, the immersion depth is one range).

(4.4) Drying: After coating, the base film is transported to a 4-section oven at a speed of 25 m/min to be dried, and the fabric coating is carried out in the order in which the base film is introduced, with the temperatures of the first to fourth section ovens being 100°C, 105°C, 110°C, and 110°C, respectively, and the wind speeds of the first to fourth section ovens being 3 m/sec, 4 m/sec, 5 m/sec, and 5 m/sec, respectively.

(5) Hydrophobic treatment

The coating surface of the base film processed in step (4) is subjected to hydrophobic treatment so that 8 wt% of a hydrophobic finishing agent is distributed on the ultra-thin, ultra-permeable microporous membrane.

The ultra-thin, super-permeable microporous membrane finally manufactured is a membrane containing micropores, the membrane thickness is 5 μm, the pore size of the micropores is 1 to 4 μm, and the average pore size is 2 μm. The air permeability of the membrane meets the national standard according to the standard test of GB/T 5453 <Test of Air Permeability of Textile Fabrics>, and the feather leakage prevention of the membrane meets the national standard according to the standard test of GB/T14272-2011 <Down Clothing>, the waterproof grade of the membrane is not less than Grade 4, and the water pressure resistance of the membrane is greater than 5 KPa.

Example 6

The specific steps of the method for manufacturing an ultra-thin, ultra-permeable microporous membrane are as follows.

(1) Preparation of raw materials;

Water-based adhesive: PET;

Functional supplement: Shanghai Houjing ( ) Nano copper aqueous dispersion, trade name CUS-WM1000;

Mercury Foam Stabilizer: Shenzhen Du Dao United Chemical Co., Ltd. ) 9002-84-0 Synthetic leather foam stabilizer;

Silicone resin polyether emulsion type water-based foam stabilizer: Shandong Yusu Chemical Co., Ltd. ) Modified silicone resin polyether fine emulsion FM-550;

water;

Base fabric: Ultra-fine filament fabric;

(2) Adhesive mixing;

Based on the weight part, 100 parts by weight of water-based adhesive, 10 parts of Shanghai Houjing nano copper water-based dispersion, and water are mixed in an adhesive container to obtain a mixture having a viscosity of 500 CPS, and then 0.1 part of a water-based foam stabilizer and 0.5 part of a silicone resin polyether emulsion-based water-based foam stabilizer are added to the mixture to obtain a water-based foam adhesive.

(3) Micro-nano foaming;

The micro-nano foaming machine automatically extracts water-based foaming adhesive from the adhesive tank and then foams the water-based foaming adhesive. The foaming control parameters of the micro-nano foaming machine include a bubble specific gravity of 500 g/L, a stirring head operating rotation speed of 330 rpm, and a pump output of 200 L/hour.

The diameter of the bubbles obtained through foaming treatment is less than 5 μm and the average diameter is 3 μm.

(4) Micro-concave high-precision coating;

Micro-concave high-precision coating is used in a high-precision micro-concave coating machine with a uniform film formation, uniform film surface, and no blind spots in the coating film when the coating layer thickness is 5 μm, and the specific steps are as follows.

(4.1) Clean the material bin and select and assemble the micro-concave coating shaft: Clean the micro-concave coating material bin for production, select 150 anilox roller lines, design a micro-concave roller with a coating layer thickness of 5 μm, and install it on the material bin according to the standard work process.

(4.2) Fabric loading: The base fabric is loaded into the entire machine according to the fabric guiding direction requirement of the machine, and the product after fabric coating (i.e., ultra-thin, ultra-permeable microporous membrane) is wound at the winding point, and the roller in contact with the ultra-thin, ultra-permeable microporous membrane in the winding equipment is a high-precision mirror roller.

(4.3) Fabric coating: The product of step (3) is transferred to a micro-concave coating material tank through an adhesive transfer pipe, and the fabric coating roller is immersed, and the immersion depth is 1/4 to 1/2 of the diameter of the fabric coating roller (since the auxiliary agent in the tank is dynamic, the immersion depth is one range).

(4.4) Drying: After coating, the base fabric is transported to a 4-section oven at a speed of 40 m/min to be dried, and the temperature of the first to fourth section ovens is 100°C, 130°C, 155°C, and 155°C, respectively, according to the order in which the base fabric is introduced, and the wind speed of the first to fourth section ovens is 3 m/sec, 4 m/sec, 5 m/sec, and 5 m/sec, respectively.

The ultra-thin, super-permeable microporous membrane finally manufactured is a membrane containing micropores, the membrane thickness is 5 μm, the pore size of the micropores is 1 to 4 μm, and the average pore size is 2 μm. The air permeability of the membrane meets the national standard according to the standard test of GB/T 5453 <Test of Air Permeability of Textile Fabrics>, and the feather leakage prevention of the membrane meets the national standard according to the standard test of GB/T14272-2011 <Down Clothing>, the waterproof grade of the membrane is not less than Grade 4, and the water pressure resistance of the membrane is greater than 5 KPa.

Example 7

The specific steps of the method for manufacturing an ultra-thin, ultra-permeable microporous membrane are as follows.

(1) Preparation of raw materials;

Water-based adhesive: PE;

Mercury Foam Stabilizer: Shenzhen Du Dao United Chemical Co., Ltd. ) 9002-84-0 Synthetic leather foam stabilizer;

Silicone resin polyether emulsion type water-based foam stabilizer: Shandong Yusu Chemical Co., Ltd. ) Modified silicone resin polyether fine emulsion FM-550;

water;

Base fabric: Ultra-fine filament fabric;

(2) Adhesive mixing;

Based on the weight part, 100 parts by weight of a water-based adhesive and water are mixed in an adhesive container to obtain a mixture having a viscosity of 500 CPS, and then 0.1 part of a water-based foam stabilizer and 0.5 part of a silicone resin polyether emulsion-based water-based foam stabilizer are added to the mixture to obtain a water-based foam adhesive.

(3) Base fabric treatment;

Electron beam irradiation treatment and calendar treatment are performed on a base fabric, and in a calendar used for the calendar treatment, the roller in contact with the base fabric is a high-precision mirror alloy roller, and the support roller is a rubber roller.

(4) Micro-nano foaming;

The micro-nano foaming machine automatically extracts water-based foaming adhesive from the adhesive tank and then foams the water-based foaming adhesive. The foaming control parameters of the micro-nano foaming machine include a bubble specific gravity of 500 g/L, a stirring head operating rotation speed of 330 rpm, and a pump output of 300 L/hour.

The diameter of the bubbles obtained through foaming treatment is less than 5 μm and the average diameter is 3 μm.

(5) Micro-concave high-precision coating;

Micro-concave high-precision coating is used in a high-precision micro-concave coating machine with a uniform film formation, uniform film surface, and no blind spots in the coating film when the coating layer thickness is 5 μm, and the specific steps are as follows.

(5.1) Clean the material bin and select and assemble the micro-concave coating shaft: Clean the micro-concave coating material bin for production, select 150 anilox roller lines, design a micro-concave roller with a coating layer thickness of 5 μm, and install it on the material bin according to the standard work process.

(5.2) Fabric loading: The base fabric is loaded into the entire machine according to the fabric guiding direction requirement of the machine, and the product after fabric coating (i.e., ultra-thin, ultra-permeable microporous membrane) is wound at the winding point, and the roller in contact with the ultra-thin, ultra-permeable microporous membrane in the winding equipment is a high-precision mirror roller.

(5.3) Fabric coating: The product of step (4) is transferred to a micro-concave coating material tank through an adhesive transfer pipe, and the fabric coating roller is immersed, and the immersion depth is 1/4 to 1/2 of the diameter of the fabric coating roller (since the auxiliary agent in the tank is dynamic, the immersion depth is one range).

(5.4) Drying: After coating, the base fabric is transported to a 4-section oven at a speed of 45 m/min to be dried, and the temperature of the first to fourth section ovens is 100°C, 130°C, 155°C, and 155°C, respectively, according to the order in which the base fabric is introduced, and the wind speed of the first to fourth section ovens is 3 m/sec, 4 m/sec, 5 m/sec, and 5 m/sec, respectively.

(6) Cold pressing;

The coated surface of the base fabric processed in step (5) is cold pressed.

The cold pressing temperature is 27℃, the cold pressing pressure is 1MPa, and the cold pressing speed is 30m/min.

The ultra-thin, ultra-permeable microporous membrane finally manufactured is a membrane containing micropores, the membrane thickness is 5 μm, the pore size of the micropores is 1 to 5 μm, and the average pore size is 3 μm. The air permeability of the membrane meets the national standard according to the standard test of GB/T 5453 <Test of Air Permeability of Textile Fabrics>, and the feather leakage prevention of the membrane meets the national standard according to the standard test of GB/T14272-2011 <Down Clothing>, and the waterproof grade of the membrane is Grade 4, and the water pressure resistance of the membrane is 5 KPa.

Example 8

The specific steps of the method for manufacturing an ultra-thin, ultra-permeable microporous membrane are as follows.

(1) Preparation of raw materials;

Water-based adhesive: PP;

Mercury Foam Stabilizer: Shenzhen Du Dao United Chemical Co., Ltd. ) 9002-84-0 Synthetic leather foam stabilizer;

Silicone resin polyether emulsion type water-based foam stabilizer: Shandong Yusu Chemical Co., Ltd. ) Modified silicone resin polyether fine emulsion FM-550;

water;

Base film: opp film;

Hydrophobic finish: Shanghai Houzheng ( ) Colorless transparent graffiti prevention aid FTY-FG3;

(2) Adhesive mixing;

Based on the weight part, 100 parts by weight of a water-based adhesive and water are mixed in an adhesive container to obtain a mixture having a viscosity of 500 CPS, and then 0.1 part of a water-based foam stabilizer and 0.5 part of a silicone resin polyether emulsion-based water-based foam stabilizer are added to the mixture to obtain a water-based foam adhesive.

(3) Base film treatment;

Electron beam transfer processing is performed on the base film.

(4) Micro-nano foaming;

The micro-nano foaming machine automatically extracts water-based foaming adhesive from the adhesive tank and then foams the water-based foaming adhesive. The foaming control parameters of the micro-nano foaming machine include a bubble specific gravity of 500 g/L, a stirring head operating rotation speed of 330 rpm, and a pump output of 250 L/hour.

The diameter of the bubbles obtained through foaming treatment is less than 5 μm and the average diameter is 3 μm.

(5) Micro-concave high-precision coating;

Micro-concave high-precision coating is used in a high-precision micro-concave coating machine with a uniform film formation, uniform film surface, and no blind spots in the coating film when the coating layer thickness is 5 μm, and the specific steps are as follows.

(5.1) Clean the material bin and select and assemble the micro-concave coating shaft: Clean the micro-concave coating material bin for production, select 150 anilox roller lines, design a micro-concave roller with a coating layer thickness of 5 μm, and install it on the material bin according to the standard work process.

(5.2) Fabric loading: The base film is loaded into the entire machine according to the fabric guiding direction requirement of the machine, and the product after fabric coating (i.e., ultra-thin, ultra-permeable microporous membrane) is wound at the winding point, and the roller in contact with the ultra-thin, ultra-permeable microporous membrane in the winding equipment is a high-precision mirror roller.

(5.3) Fabric coating: The product of step (4) is transferred to a micro-concave coating material tank through an adhesive transfer pipe, and the fabric coating roller is immersed, and the immersion depth is 1/4 to 1/2 of the diameter of the fabric coating roller (since the auxiliary agent in the tank is dynamic, the immersion depth is one range).

(5.4) Drying: After coating, the base film is transported to a 4-section oven at a speed of 25 m/min to be dried, and the fabric coating is carried out in the order in which the base film is introduced, with the temperatures of the first to fourth section ovens being 100°C, 105°C, 110°C, and 110°C, respectively, and the wind speeds of the first to fourth section ovens being 3 m/sec, 4 m/sec, 5 m/sec, and 5 m/sec, respectively.

(6) Hot pressing;

The coated surface of the base film processed in step (5) is hot pressed.

The hot pressing temperature is 100℃, the hot pressing pressure is 0.8MPa, and the hot pressing speed is 35m/min.

(7) Hydrophobic treatment

The coating surface of the base film processed in step (5) is subjected to hydrophobic treatment so that 8 wt% of the hydrophobic finishing agent is distributed on the ultra-thin, ultra-permeable microporous membrane.

The ultra-thin, ultra-permeable microporous membrane finally manufactured is a membrane containing micropores, the membrane thickness is 4.5 μm, the pore size of the micropores is 1 to 4 μm, and the average pore size is 2 μm. The air permeability of the membrane meets the national standard according to the standard test of GB/T 5453 <Test of Air Permeability of Textile Fabrics>, and the feather leakage prevention of the membrane meets the national standard according to the standard test of GB/T14272-2011 <Down Clothing>, and the waterproof grade of the membrane is Grade 4, and the water pressure resistance of the membrane is 5 KPa.

Claims (7)

In a method for manufacturing an ultra-thin, ultra-permeable microporous membrane,
An ultra-thin, ultra-permeable microporous membrane is obtained by foaming a water-based foam adhesive using a micro-nano foaming machine to obtain bubbles and then performing a micro-concave, high-precision coating.
On a weight basis, the water-based foam adhesive comprises 100 parts of water-based adhesive, 0 to 15 parts of functional additive, 0.1 to 5 parts of water-based foam stabilizer, 0.1 to 5 parts of silicone resin polyether emulsion-based water-based foam stabilizer, and n parts of water.
When the functional additive exceeds 0, the viscosity of the mixture of water-based adhesive, functional additive and water is 500 CPS,
When the functional additive is 0, the viscosity of the mixture of water-based adhesive and water is 500 CPS.
The water n part is determined by the weight parts of the components constituting the water-based foam adhesive and the viscosity of the mixture,
The foaming control parameters of the micro-nano foamer include a bubble specific gravity of 350 to 700 g/L, a stirring head operating rotation speed of 250 to 400 rpm, and a pump output of 100 to 500 L/hour.
The diameter of the bubbles is less than 5 μm,
In the case of fine concave high-precision coating, the thickness of the coating layer is less than 5 μm and greater than the diameter of the bubble.
A method for producing an ultra-thin, ultra-permeable microporous membrane, characterized in that the ultra-thin, ultra-permeable microporous membrane is a membrane containing micropores, and the membrane has a thickness of 5 μm or less and the pore diameter of the micropores is 5 μm or less. In the first paragraph,
A method for producing an ultra-thin, ultra-permeable microporous membrane, characterized in that the target of the micro-concave high-precision coating is a base fabric or a base film. In the second paragraph,
A method for producing an ultra-thin, ultra-permeable microporous membrane, characterized in that electron beam irradiation treatment is performed on a base fabric or base film prior to fine concave high-precision coating. In the second paragraph,
A method for manufacturing an ultra-thin, ultra-permeable microporous membrane, characterized in that the base fabric is an ultra-fine filament fabric that has undergone calendar processing. In paragraph 4,
A method for producing an ultra-thin, ultra-permeable microporous membrane, characterized in that in a calendar used for calendar processing, the roller in contact with the base fabric is a high-precision mirror alloy roller, and the support roller is a high-level flat rubber roller. In the second paragraph,
A method for producing an ultra-thin, ultra-permeable microporous membrane, characterized in that after fine concave high-precision coating, hot pressing or cold pressing is performed on the coating layer of the base fabric or base film, the temperature of the hot pressing is lower than the melting point of the water-based adhesive and higher than room temperature, and at the same time does not exceed the highest temperature resistance value of the base fabric or base film, the temperature of the cold pressing is room temperature, the pressure of the hot pressing or cold pressing is 0.5 to 1 MPa, and the speed of the hot pressing or cold pressing is 15 to 50 m/min. In the second paragraph,
A method for producing an ultra-thin, ultra-permeable microporous membrane, characterized in that after fine concave high-precision coating, a hydrophobic treatment is performed on the coating layer of a base fabric or base film.