CN119956565B - Polyethylene non-woven material and preparation method thereof - Google Patents
Polyethylene non-woven material and preparation method thereofInfo
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- CN119956565B CN119956565B CN202311468854.8A CN202311468854A CN119956565B CN 119956565 B CN119956565 B CN 119956565B CN 202311468854 A CN202311468854 A CN 202311468854A CN 119956565 B CN119956565 B CN 119956565B
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Abstract
本发明涉及一种聚乙烯非织造材料及其制备方法，聚乙烯非织造材料包括第一纺粘层、熔喷层和第二纺粘层，熔喷层夹设于所述第一纺粘层和所述第二纺粘层之间，熔喷层是将第一高熔融指数聚乙烯和第二高熔融指数聚乙烯进行熔喷纺丝形成的，第一高熔融指数聚乙烯和第二高熔融指数聚乙烯的熔融指数均大于或等于200g/10min，且第一高熔融指数聚乙烯和所述第二高熔融指数聚乙烯的熔融指数不同。本发明采用高熔融指数聚乙烯通过熔喷纺丝制备熔喷层，且采用两种不同熔指的高熔融指数聚乙烯，可以利用不同熔指聚乙烯的结晶速率快慢和流动性，起到在结晶过程中非晶区中缚结分子诱导分子链取向的作用，从而提高纤维增强的作用，有效解决熔喷纤维力学强度低的问题。
This invention relates to a polyethylene nonwoven material and its preparation method. The polyethylene nonwoven material includes a first spunbond layer, a meltblown layer, and a second spunbond layer, with the meltblown layer sandwiched between the first and second spunbond layers. The meltblown layer is formed by meltblowing first high melt index polyethylene and second high melt index polyethylene. The melt index of both the first and second high melt index polyethylenes is greater than or equal to 200 g/10 min, and the melt indices of the first and second high melt index polyethylenes are different. This invention uses high melt index polyethylene to prepare the meltblown layer through meltblowing spinning, and uses two high melt index polyethylenes with different melt indices. The different crystallization rates and fluidity of the polyethylenes with different melt indices can be utilized to induce molecular chain orientation in the amorphous region during crystallization, thereby improving fiber reinforcement and effectively solving the problem of low mechanical strength of meltblown fibers.
Description
Technical Field
The invention relates to the field of non-woven materials, in particular to a polyethylene non-woven material and a preparation method thereof.
Background
Radiation sterilization is an effective method of killing microorganisms on most substances using electromagnetic waves generated by ionizing radiation. Examples of the radiation used for sterilization include electron beam, X-ray, and gamma ray. They can destroy ribonucleic acid, protein and enzyme of microorganism directly or indirectly, thus killing microorganism and sterilizing. The same principle applies to the inactivation of viruses by high-energy radiation. Compared with the widely adopted ethylene oxide sterilization technology, the irradiation sterilization has the advantages of thorough sterilization, no pollution, no residue, high speed, simple and convenient operation, energy conservation and the like, has no special requirements on direct packaging materials of products, can be used for boxing and then irradiating, avoids the risk of secondary pollution, can continuously operate, and can finish large-scale product irradiation in a short time.
High-end medical protective clothing is an important barrier for guaranteeing medical staff and is an important material necessary for coping with important public security events. The irradiation sterilization is adopted to replace the existing ethylene oxide sterilization process, so that the sterilization speed of the protective clothing is greatly improved, the sterilization time is shortened from 7-14 days to less than 1 day, and the supply period from the production of protection compliance to hospitals is obviously shortened. At present, the domestic protective clothing material basically adopts polypropylene non-woven fabrics as the main material, but has poorer irradiation resistance.
The high-density polyethylene non-woven fabric has good irradiation resistance and high long-term storage stability after irradiation sterilization, so that the close cooperation of a longer industrial chain is needed in the future to produce high-specification protective clothing products suitable for the irradiation sterilization process. Polyethylene has low melt index and high melt viscosity, and is not easily dissolved in a solvent at normal temperature and normal pressure, so that the conventional spinning means cannot process the polyethylene into a microfiber nonwoven material.
At present, the high-end medical protective clothing is limited to the Tevex strong polyethylene flash evaporation non-woven fabric produced by DuPont in the United states, can bear ray radiation sterilization, can be repeatedly used for a plurality of times when necessary, and has the advantage of high mechanical strength and high protective performance. However, the flash evaporation process of high-end medical protective clothing requires a large amount of solvent, and the high-temperature and high-pressure process brings great environmental pressure to production.
The Chinese patent application with the application number 202110392998.4 relates to a preparation method of a polyethylene non-woven fabric with antibacterial property and the polyethylene non-woven fabric. The preparation method comprises the steps of 1) taking high-density polyethylene, difluoromethane and tetrafluoro dichloroethane as raw materials to prepare spinning solution, 2) preparing the spinning solution obtained in the step 1) into a polyethylene non-woven fabric through a flash spinning method, and 3) preparing an antibacterial finishing agent, and coating the antibacterial finishing agent on the polyethylene non-woven fabric to perform antibacterial treatment to obtain the antibacterial polyethylene non-woven fabric. The prepared polyethylene non-woven fabric can be applied to medical materials, food packaging materials, clothing materials and the like. However, as described above, the flash spinning method is used for forming the polyethylene non-woven fabric, a large amount of solvent is required in the flash process, the temperature and the pressure are high, the process difficulty is high, and the environmental protection pressure is high.
Accordingly, there is still a need in the art for further research into polyethylene nonwoven materials.
Disclosure of Invention
The invention mainly aims to provide a polyethylene non-woven material and a preparation method thereof, which are used for overcoming the defects of complex process, unfriendly environment and the like in the preparation process of polyethylene in the prior art, and can overcome the problem that the polypropylene non-woven material is not resistant to irradiation.
In order to achieve the above object, the present invention provides a polyethylene nonwoven material, comprising a first spunbond layer, a meltblown layer and a second spunbond layer, wherein the meltblown layer is sandwiched between the first spunbond layer and the second spunbond layer, the meltblown layer is formed by melt-spinning a first high melt index polyethylene and a second high melt index polyethylene, the melt indices of the first high melt index polyethylene and the second high melt index polyethylene are both greater than or equal to 200 g/10min, and the melt indices of the first high melt index polyethylene and the second high melt index polyethylene are different.
The polyethylene non-woven material comprises a first high-melt-index polyethylene, a second high-melt-index polyethylene, a first heat-resistant layer and a second heat-resistant layer, wherein the melt index of the first high-melt-index polyethylene is 200-600 g/10min, the melt index of the second high-melt-index polyethylene is 1000-1500 g/10min, and the mass ratio of the first high-melt-index polyethylene to the second high-melt-index polyethylene is 5-20:80-95.
The polyethylene nonwoven material provided by the invention, wherein the first spun-bonded layer and the second spun-bonded layer are both polyethylene spun-bonded layers.
The polyethylene non-woven material is characterized in that a spinning auxiliary agent is further added into the melt-blown layer, the spinning auxiliary agent is at least one of dicumyl peroxide and 4,4 '-thiobis (6-tertiary butyl-3-methylphenol), the mass of the dicumyl peroxide is 0.01-0.2% of the sum of the mass of the first high-melt-index polyethylene and the mass of the second high-melt-index polyethylene, and the mass of the 4,4' -thiobis (6-tertiary butyl-3-methylphenol) is 0.1-0.2% of the sum of the mass of the first high-melt-index polyethylene and the mass of the second high-melt-index polyethylene.
The transverse and longitudinal breaking strength of the polyethylene nonwoven material is more than or equal to 80N, the moisture permeability is more than 8000 g/(m 2 & d), the water pressure resistance is more than 10kPa, and the blood grade resistance is more than 3 grades.
In order to achieve the above object, the present invention also provides a method for preparing a polyethylene nonwoven material comprising a first spunbond layer, a meltblown layer and a second spunbond layer, the method comprising:
step 1, mixing and granulating a first high melt index polyethylene and a second high melt index polyethylene;
Step 2, carrying out melt-blowing spinning on the resin obtained in the step 1 to form a melt-blowing layer on the first spun-bonding layer;
and step 3, compounding the second spun-bonded layer with the melt-blown layer so that the melt-blown layer is clamped between the first spun-bonded layer and the second spun-bonded layer to obtain the polyethylene non-woven material.
The preparation method of the polyethylene non-woven material comprises the steps of preparing a first high-melt-index polyethylene and a second high-melt-index polyethylene, wherein the melt indexes of the first high-melt-index polyethylene and the second high-melt-index polyethylene are respectively larger than or equal to 200 g/10min, and the melt indexes of the first high-melt-index polyethylene and the second high-melt-index polyethylene are different.
The preparation method of the polyethylene non-woven material comprises the steps of enabling a melt index of a first high-melt-index polyethylene to be 200-600 g/10min, enabling a melt index of a second high-melt-index polyethylene to be 1000-1500 g/10min, and enabling a mass ratio of the first high-melt-index polyethylene to the second high-melt-index polyethylene to be 5-20:80-95.
The preparation method of the polyethylene non-woven material comprises the following steps of 1, adding a spinning auxiliary agent in the mixing and granulating process of first high-melt-index polyethylene and second high-melt-index polyethylene, wherein the spinning auxiliary agent is at least one of dicumyl peroxide and 4,4 '-thiobis (6-tert-butyl-3-methylphenol), the mass of the dicumyl peroxide is 0.01-0.2% of the sum of the mass of the first high-melt-index polyethylene and the mass of the second high-melt-index polyethylene, and the mass of the 4,4' -thiobis (6-tert-butyl-3-methylphenol) is 0.1-0.2% of the sum of the mass of the first high-melt-index polyethylene and the mass of the second high-melt-index polyethylene.
The preparation method of the polyethylene non-woven material comprises the following steps of carrying out step 2 in a melt-blowing spinning machine, wherein the temperature of a screw is 200-240 o ℃, the temperature of hot air is 230-260 o ℃, and the conveying speed and the web curtain moving speed of the first spun-bonded layer are 20-100 m/min.
The invention has the beneficial effects that:
(1) The invention prepares the melt-blown layer by melt-blowing spinning with the high melt-index polyethylene, and adopts the high melt-index polyethylene with two different melt-indexes, thereby utilizing the difference of crystallization speed and fluidity of the polyethylene with different melt-indexes to play a role in inducing molecular chain orientation by tie molecules in an amorphous area in the crystallization process, improving the fiber reinforcement effect and effectively solving the problem of low mechanical strength of melt-blown fibers.
(2) In addition, the invention constructs a molecular chain structure with a comb structure by utilizing polyethylene with different melt fingers to further regulate the crystallization and orientation of the fiber and further enhance the strength of the melt-blown polyethylene microfiber.
(3) The polyethylene non-woven material has a structure of a spun-bonded layer, a melt-blown layer and a spun-bonded layer, and has excellent barrier property and safety.
Drawings
FIG. 1 is a schematic illustration of a melt blown-spun bond polyethylene microfiber nonwoven material processing process;
FIG. 2 is a schematic structural diagram of a spunbond-meltblown-spunbond polyethylene microfiber nonwoven material.
Wherein, the reference numerals:
1. Feeding device
2. Screw extruder
3. Metering pump
4. Web forming device
5. Melt-blowing die head
6. First spunbond layer
7. Winding device
Detailed Description
The following embodiments are provided by carrying out the embodiments of the present invention on the premise of the embodiments of the present invention, and the detailed implementation process is given, but the scope of the present invention is not limited to the following embodiments, and the following embodiments do not specify specific conditions, structures or experimental methods, and generally follow conventional conditions.
The invention provides a polyethylene nonwoven material, which comprises a first spun-bonded layer, a melt-blown layer and a second spun-bonded layer, wherein the melt-blown layer is arranged between the first spun-bonded layer and the second spun-bonded layer, the melt-blown layer is formed by carrying out melt-blown spinning on a first high-melt-index polyethylene and a second high-melt-index polyethylene, the melt index of the first high-melt-index polyethylene and the melt index of the second high-melt-index polyethylene are both greater than or equal to 200 g/10min (wherein the melt index refers to the melt index tested at the temperature of 190 ℃ under the load of 2.16 kg), and the melt indexes of the first high-melt-index polyethylene and the second high-melt-index polyethylene are different.
The invention adopts high melt index polyethylene to prepare the melt-blown layer through melt-blowing spinning, and adopts two kinds of high melt index polyethylene with different melt indexes, so that the crystallization speed and fluidity of the polyethylene with different melt indexes can be utilized to play a role in inducing molecular chain orientation by tie molecules in an amorphous region in the crystallization process, thereby improving the fiber reinforcement effect and effectively solving the problem of low mechanical strength of melt-blown fibers.
In one embodiment, the first high melt index polyethylene has a melt index of 200 to 600 g/10min and the second high melt index polyethylene has a melt index of 1000 to 1500 g/10min (melt index is measured at 190℃under a load of 2.16 kg). In another embodiment, the mass ratio of the first high melt index polyethylene to the second high melt index polyethylene is 5-20:80-95.
In one embodiment, the melt-blown layer of the present invention is further added with a spinning aid, which may be a processing aid, an antioxidant, etc. Specifically, the spinning aid is at least one of dicumyl peroxide and 4,4 '-thiobis (6-tertiary butyl-3-methylphenol), wherein the mass of the dicumyl peroxide is 0.01-0.2% of the sum of the mass of the first high melt index polyethylene and the mass of the second high melt index polyethylene, and the mass of the 4,4' -thiobis (6-tertiary butyl-3-methylphenol) is 0.1-0.2% of the sum of the mass of the first high melt index polyethylene and the mass of the second high melt index polyethylene.
In one embodiment, the spinning aid of the present invention is added during the mixing granulation of the first high melt index polyethylene and the second high melt index polyethylene, and the spinning aid of the present invention, such as dicumyl peroxide, preferentially reacts with the higher melt index polyethylene to induce free radicals to form a polyethylene comb chain structure with the relatively low melt index polyethylene as a backbone and the relatively high melt index polyethylene as a comb chain. The existence of the structure can efficiently induce the nucleation of the polyethylene melt-blowing process, so that the chain orientation is induced under the hot air micro-drafting to obtain the self-reinforced polyethylene microfiber.
The first spunbond layer and the second spunbond layer are prepared by adopting a spunbond method, the preparation process of the first spunbond layer and the second spunbond layer is not particularly limited, and the preparation method is conventional in the field. In one embodiment, the first spunbond layer and the second spunbond layer of the present invention are both polyethylene spunbond layers.
The transverse and longitudinal breaking strength of the polyethylene nonwoven material is more than or equal to 80N, the moisture permeability is more than 8000 g/(m 2 & d), the water pressure resistance is more than 10kPa, and the blood grade resistance is more than 3 grades. Protective apparel may be made from the polyethylene nonwoven materials of the present invention.
The invention also provides a preparation method of the polyethylene non-woven material, the polyethylene non-woven material comprises a first spun-bonded layer, a melt-blown layer and a second spun-bonded layer, and the preparation method comprises the following steps:
step 1, mixing and granulating a first high melt index polyethylene and a second high melt index polyethylene;
Step 2, carrying out melt-blowing spinning on the resin obtained in the step 1 to form a melt-blowing layer on the first spun-bonding layer;
and step 3, compounding the second spun-bonded layer with the melt-blown layer so that the melt-blown layer is clamped between the first spun-bonded layer and the second spun-bonded layer to obtain the polyethylene non-woven material.
The melt-blown layer is directly melt-blown on the first spun-bonded layer and then is compounded with the second spun-bonded layer, so that the polyethylene non-woven material with a spun-bonded-melt-blown-spun-bonded structure is obtained, and the structural non-woven material has excellent barrier property and safety.
In one embodiment, the first high melt index polyethylene and the second high melt index polyethylene each have a melt index greater than or equal to 200 g/10min and the first high melt index polyethylene and the second high melt index polyethylene have different melt indices. In another embodiment, the first high melt index polyethylene has a melt index of 200-600 g/10min, the second high melt index polyethylene has a melt index of 1000-1500 g/10min, wherein the melt index is measured under a load of 2.16kg at 190 ℃, and the mass ratio of the first high melt index polyethylene to the second high melt index polyethylene is 5-20:80-95.
The invention does not limit the mixing and granulating process of the first high melt index polyethylene and the second high melt index polyethylene, in one embodiment, the mixing and granulating of the first high melt index polyethylene and the second high melt index polyethylene are carried out in a double screw extruder, the temperature is set between 110 and 140 o ℃ in the feeding section and the homogenizing section of the screw, and the rotating speed of the screw is 30 to 100rpm.
In one embodiment, in the step 1, a spinning aid, such as a processing aid, an antioxidant, etc., is further added during the process of mixing the first high melt index polyethylene and the second high melt index polyethylene. The spinning auxiliary agent is at least one of dicumyl peroxide and 4,4 '-thiobis (6-tertiary butyl-3-methylphenol), wherein the mass of the dicumyl peroxide is 0.01-0.2% of the sum of the mass of the first high melt index polyethylene and the mass of the second high melt index polyethylene, and the mass of the 4,4' -thiobis (6-tertiary butyl-3-methylphenol) is 0.1-0.2% of the sum of the mass of the first high melt index polyethylene and the mass of the second high melt index polyethylene.
The first spunbond layer and the second spunbond layer are prepared by adopting a spunbond method, the preparation process of the first spunbond layer and the second spunbond layer is not particularly limited, and the preparation method is conventional in the field. In one embodiment, the first spunbond layer and the second spunbond layer of the present invention are both polyethylene spunbond layers.
The meltblown layer is formed directly on the first spunbond layer. In one embodiment, after the first high melt index polyethylene and the second high melt index polyethylene are mixed and granulated, the mixture enters a melt-blown spinning machine, the screw temperature is 200-240 o ℃ and the hot air temperature is 230-260 o ℃, and polyethylene microfibers obtained by melt blowing are deposited on an input first spunbond layer on a web forming device to form a nonwoven material with a spunbond-melt blown structure. In another embodiment, the conveying speed and the web moving speed of the first spunbond layer are 20-100 m/min.
The melt-blown-spun-bonded polyethylene microfiber nonwoven material of the present invention is processed as shown in fig. 1, for example, but the present invention is not limited thereto. The first high-melt-index polyethylene and the second high-melt-index polyethylene enter a screw extruder 2 through a feeding device 1, and the composite resin is extruded and granulated and then deposited on a web forming device 4 through a metering pump 3 and a melt-blowing die head 5. The first spunbond layer 6 is fed to the web forming device 4, and the polyethylene microfibers obtained by melt-blowing are deposited on the first spunbond layer 6 on the web forming device 4, and the nonwoven material of the obtained spunbond-melt-blown structure is wound up by the winding device 7.
And finally, compounding the second spun-bonded layer with the melt-blown layer, namely compounding the second spun-bonded layer on one surface of the melt-blown layer opposite to the first spun-bonded layer in the spun-bonded-melt-blown structure, so that the melt-blown layer is clamped between the first spun-bonded layer and the second spun-bonded layer, and obtaining the polyethylene non-woven material.
The present invention is not particularly limited to the process of compounding the second spunbond layer with the meltblown layer, and may be conventional in the art.
The polyethylene non-woven material has high mechanical property, high filtering property, good barrier property and irradiation resistance, and is controlled to be 16-27 kgy in metering when electron beam radiation sterilization or X-ray sterilization is selected, and no escherichia coli colony, bacterial colony, fungal colony and the like exist after irradiation.
The technical scheme of the invention will be further described in detail through specific examples.
Raw material or equipment source:
(1) Raw materials:
Polyethylene with high melt index is provided by Daqing chemical research center of China petroleum and natural gas stock company;
Dicumyl peroxide, produced by sigma aldrich (Shanghai) trade limited;
the antioxidant 4,4' -thiobis (6-t-butyl-3-methylphenol) is manufactured by wuhans microphone biotechnology limited.
(2) The device comprises:
kneading equipment, manufactured by the university of east China;
a melt-blown spinning machine produced by camel group;
x-ray irradiation apparatus, manufactured by Bruke, germany.
Example 1
1) Preparing polyethylene composite resin:
15kg of polyethylene powder with a melt index of 200 g/10min, 85kg of polyethylene powder with a melt index of 1000 g/10min, 0.1kg of dicumyl peroxide and 0.1kg of 4,4' -thiobis (6-tert-butyl-3-methylphenol) are fully and mechanically premixed, and then added into a twin screw for reactive extrusion to obtain the composite resin. Wherein, the temperature of the screw feeding section to the homogenizing section is 110-140 o ℃ and the screw rotating speed is 50rpm.
2) Preparing a melt-blown-spun-bonded polyethylene microfiber composite nonwoven material:
The back end of the camel group melt-blown spinning machine is added into a feeding device of the first spun-bonded polyethylene non-woven fabric, and then melt-blown polyethylene micro fibers are collected on the first spun-bonded polyethylene non-woven fabric (shown in figure 1). Wherein, the feeding speed of the first spun-bonded polyethylene non-woven fabric is 30m/min, the temperature of the melt-blown component is 200 o C, the temperature of hot air is 260 o C, the frequency of the hot air is 45Hz, and the receiving distance is 25 cm. Through the operation, a double-layer non-woven material with the bottom layer taking the first spun-bonded non-woven fabric as the bottom layer and the melt-blown non-woven fabric as the load layer is obtained, and the gram weight ratio of the first spun-bonded layer to the melt-blown layer is controlled to be 3-10:90-97, as shown in figure 2.
3) Spunbond-meltblown-spunbond polyethylene microfiber nonwoven material:
And compounding the double-layer non-woven material obtained by the steps with a second spun-bonded polyethylene non-woven fabric, and rolling and pressing by a hot roller to obtain the polyethylene non-woven material. The polyethylene nonwoven material is prepared into protective clothing, the transverse and longitudinal breaking strength of the protective clothing reaches 85N, the moisture permeability is more than 8200 g/(m 2 & d), the water pressure resistance is more than 11kPa, and the blood grade resistance is more than 3 grades. After the 16 kgy electron beam radiation sterilization, the protective clothing performance is not attenuated.
Example 2
1) Preparing polyethylene composite resin:
20kg of polyethylene powder with a melt index of 400 g/10min, 80kg of polyethylene powder with a melt index of 1200 g/10min, 0.01kg of dicumyl peroxide and 0.1kg of 4,4' -thiobis (6-tert-butyl-3-methylphenol) are fully and mechanically premixed, and then added into a twin screw for reactive extrusion to obtain the composite resin. Wherein, the temperature of the screw feeding section to the homogenizing section is 110-140 o ℃ and the screw rotating speed is 100rpm.
2) Preparing a melt-blown-spun-bonded polyethylene microfiber composite nonwoven material:
And adding a feeding device of the spun-bonded polyethylene non-woven fabric into the rear end of the camel group melt-blown spinning machine, and then collecting the melt-blown polyethylene micro fibers on the first spun-bonded polyethylene non-woven fabric. Wherein, the feeding speed of the first spun-bonded polyethylene non-woven fabric is 20m/min, the temperature of the melt-blown component is 210 o C, the temperature of hot air is 250 o C, the frequency of the hot air is 45Hz, and the receiving distance is 25 cm. Through the operation, the double-layer non-woven material with the bottom layer taking the first spun-bonded non-woven fabric as the bottom layer and the melt-blown non-woven fabric as the load layer is obtained, and the gram weight ratio of the first spun-bonded layer to the melt-blown layer is controlled to be 3-10:90-97.
3) Spunbond-meltblown-spunbond polyethylene microfiber nonwoven material:
And compounding the double-layer non-woven material obtained by the steps with a second spun-bonded polyethylene non-woven fabric, and rolling and pressing by hot rolls to obtain the non-woven material made of polyethylene. The polyethylene nonwoven material is prepared into protective clothing, the transverse and longitudinal breaking strength of the protective clothing reaches 93N, the moisture permeability is more than 8000 g/(m 2 & d), the water pressure resistance is more than 13kPa, and the blood grade resistance is more than 3 grades. After 27 kgy X rays are sterilized, the protective clothing performance is not attenuated.
Example 3
1) Preparing polyethylene composite resin:
17kg of polyethylene powder with a melt index of 600 g/10min, 83kg of polyethylene powder with a melt index of 1500 g/10min, 0.1kg of dicumyl peroxide and 0.2kg of 4,4' -thiobis (6-tert-butyl-3-methylphenol) are fully and mechanically premixed, and then added into a twin screw for reactive extrusion to obtain the composite resin. Wherein, the temperature of the screw feeding section to the homogenizing section is 110-140 o ℃ and the screw rotating speed is 75rpm.
2) Preparing a melt-blown-spun-bonded polyethylene microfiber composite nonwoven material:
And adding a feeding device of the spun-bonded polyethylene non-woven fabric into the rear end of the camel group melt-blown spinning machine, and then collecting the melt-blown polyethylene micro fibers on the first spun-bonded polyethylene non-woven fabric. Wherein, the feeding speed of the first spun-bonded polyethylene non-woven fabric is 30m/min, the temperature of the melt-blown component is 220 o ℃, the temperature of hot air is 250 o ℃, the frequency of the hot air is 45Hz, and the receiving distance is 30cm. Through the operation, the double-layer non-woven material with the bottom layer taking the first spun-bonded non-woven fabric as the bottom layer and the melt-blown non-woven fabric as the load layer is obtained, and the gram weight ratio of the first spun-bonded layer to the melt-blown layer is controlled to be 3-10:90-97.
3) Spunbond-meltblown-spunbond polyethylene microfiber nonwoven material:
And compounding the double-layer non-woven material obtained by the steps with a second spun-bonded polyethylene non-woven fabric, and rolling and pressing by hot rolls to obtain the non-woven material made of polyethylene. The polyethylene nonwoven material is prepared into protective clothing, the transverse and longitudinal breaking strength of the protective clothing reaches 87N, the moisture permeability is more than 8500 g/(m 2 & d), the water pressure resistance is more than 11kPa, and the blood grade resistance is more than 3 grades. After sterilization by 25 kgyX rays, the protective clothing has no attenuation in performance.
Example 4
1) Preparing polyethylene composite resin:
15kg of polyethylene powder with a melt index of 400 g/10min, 85kg of polyethylene powder with a melt index of 1100 g/10min, 0.01kg of dicumyl peroxide and 0.15kg of 4,4' -thiobis (6-tert-butyl-3-methylphenol) are fully and mechanically premixed, and then added into a twin screw for reactive extrusion to obtain the composite resin. Wherein, the temperature of the screw feeding section to the homogenizing section is 110-140 o ℃ and the screw rotating speed is 100rpm.
2) Preparing a melt-blown-spun-bonded polyethylene microfiber composite nonwoven material:
And adding a feeding device of the spun-bonded polyethylene non-woven fabric into the rear end of the camel group melt-blown spinning machine, and then collecting the melt-blown polyethylene micro fibers on the first spun-bonded polyethylene non-woven fabric. Wherein, the feeding speed of the first spun-bonded polyethylene non-woven fabric is 50m/min, the temperature of the melt-blown component is 240 o ℃, the temperature of hot air is 230 o ℃, the frequency of the hot air is 45Hz, and the receiving distance is 30 cm. Through the operation, the double-layer non-woven material with the bottom layer taking the first spun-bonded non-woven fabric as the bottom layer and the melt-blown non-woven fabric as the load layer is obtained, and the gram weight ratio of the first spun-bonded layer to the melt-blown layer is controlled to be 3-10:90-97.
3) Spunbond-meltblown-spunbond polyethylene microfiber nonwoven material:
And compounding the double-layer non-woven material obtained by the steps with a second spun-bonded polyethylene non-woven fabric, and rolling and pressing by hot rolls to obtain the non-woven material made of polyethylene. The polyethylene nonwoven material is prepared into protective clothing, the transverse and longitudinal breaking strength of the protective clothing reaches 89N, the moisture permeability is more than 8300 g/(m 2 & d), the water pressure resistance is more than 12kPa, and the blood grade resistance is more than 3 grades. After electron beam radiation sterilization, the protective clothing performance is not attenuated.
Example 5
1) Preparing polyethylene composite resin:
5kg of polyethylene powder with a melt index of 400 g/10min, 95kg of polyethylene powder with a melt index of 1100 g/10min, 0.01kg of dicumyl peroxide and 0.15kg of 4,4' -thiobis (6-tert-butyl-3-methylphenol) are fully and mechanically premixed, and then added into a twin screw for reactive extrusion to obtain the composite resin. Wherein, the temperature of the screw feeding section to the homogenizing section is 110-140 o ℃ and the screw rotating speed is 100rpm.
2) Preparing a melt-blown-spun-bonded polyethylene microfiber composite nonwoven material:
And adding a feeding device of the spun-bonded polyethylene non-woven fabric into the rear end of the camel group melt-blown spinning machine, and then collecting the melt-blown polyethylene micro fibers on the first spun-bonded polyethylene non-woven fabric. Wherein, the feeding speed of the first spun-bonded polyethylene non-woven fabric is 50m/min, the temperature of the melt-blown component is 240 o ℃, the temperature of hot air is 230 o ℃, the frequency of the hot air is 45Hz, and the receiving distance is 30 cm. Through the operation, the double-layer non-woven material with the bottom layer taking the first spun-bonded non-woven fabric as the bottom layer and the melt-blown non-woven fabric as the load layer is obtained, and the gram weight ratio of the first spun-bonded layer to the melt-blown layer is controlled to be 3-10:90-97.
3) Spunbond-meltblown-spunbond polyethylene microfiber nonwoven material:
And compounding the double-layer non-woven material obtained by the steps with a second spun-bonded polyethylene non-woven fabric, and rolling and pressing by hot rolls to obtain the non-woven material made of polyethylene. The polyethylene nonwoven material is prepared into protective clothing, the transverse and longitudinal breaking strength of the protective clothing reaches 86N, the moisture permeability is more than 8400 g/(m 2 & d), the water pressure resistance is more than 12kPa, and the blood grade resistance is more than 3 grades. After electron beam radiation sterilization, the protective clothing performance is not attenuated.
Of course, the present invention is capable of other various embodiments and its several details are capable of modification and variation in light of the present invention by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
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