JPS588174A - Manufacturing method for suede-like artificial leather with flexible napping - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preparing suede-like artificial leather having soft raised naps and less shedding of fuzz.

Conventionally, in suede-like artificial leather that uses ultra-fine fibers as napped fibers, we can spin out the napped fibers and improve the physical properties of sheet-like fiber structures.

Polyurethane to improve wind effect, II! IR, N.I.
B.

It is known to use an elastic polymeric material such as acrylic as a binder for treatment. However, when a sheet-like fibrous structure is attached using a binder, the nap fibers present in Table 11 are also firmly attached to KrIA, which not only results in poor S-hair properties, but also that the resulting nap is uneven and has a poor texture. Bad,
It had the disadvantage of lacking the delicate fluff movement (lighting effect) required for suede-like artificial leather.

The inventors of the present invention have already proposed a method (Il?111@8B-16971) for manufacturing suede-like artificial leather with soft napped appearance by improving the drawbacks of the conventional method. A water-based binder is attached to a sheet-like fiber structure having raised naps.

A water-soluble agent is applied to the undried raised hair area.

After the dry heat treatment, the water-soluble sizing agent is removed. However, although the stiffening method can obtain a soft, high-density fuzzy surface, it requires detailed process control for the adhesion of water-soluble glue, and in some cases, the water-soluble adhesive reaches inside the base layer of the fibrous structure! 1
The @ agent penetrates.

As a result, we discovered that polyurethane migrates to the lower layers, resulting in problems such as the nape easily coming off, and the 凰AI-like trap also becoming a paper-like product. As a result, the present invention was achieved.

The present invention provides a sheet-like fiber structure having raised naps with 50 to 1
Apply an aqueous binder liquid with a viscosity of 0.000 ape, and without drying (apply a water-soluble glue to the raised surface).
The present invention provides a method for producing suede-like artificial leather having soft raised naps, which is characterized in that a water-soluble sizing agent is removed after a dry heat treatment.

The sheet-like fibrous structure with napped fibers applied in the present invention is a sheet-like fibrous structure with napped fibers mainly composed of at least napped fibers, preferably ultrafine fibers of 0.8 denier or less, and is of a non-woven type or knitted type. textile type,
Any type of flocked fabric can be used. Also, regarding the constituent fibers of the base of the fiber structure, see 4! There is no limit to

Examples of the binder used in the present invention include acrylic acid type, polyurethane type, boria-based type, polyurethane, tyrene-vinyl type, N
Using IR type, 5zii type Misaki high molecular elastic polymer,
Dissolve, disperse or emulsify in water and apply as an aqueous liquid.

Furthermore, in order to improve the water resistance and solvent resistance of this binder, resins and catalysts such as melakenin, urea, and glyozal are added, and fillers such as calcium carbonate and barium sulfate, pigments, dye.

A coloring agent such as carbon black, a softening agent, a texture control agent such as silicone or colloidal silica, etc. may be used in combination.The binding agent varies depending on the composition of the sheet-like fiber structure and the desired texture. aivt for the shaped fibrous structure
It is desirable to apply by means such as padding - 1 to 30 weight minutes per minute.

If the weight is less than 1 weight, the adhesion of the nap will be poor, and if it exceeds 30 weight, the texture will become rough and hard, which is not preferable.

In the present invention, it is important to control the viscosity of the aqueous binder liquid to a desired viscosity range. That is, in the present invention, in the past, when used as a binder aqueous liquid, the IIN concentration of the binding agent f was at most 30% by weight;
By increasing the viscosity of the binder aqueous liquid within a certain range, while the viscosity of the binder aqueous liquid is low, less than 50 eps.

This makes it possible to prevent the water-soluble agent applied in the post process 11 from penetrating into the inner layer of the substrate, and to prevent the binder from migrating to the lower layer during the drying process 11. To explain the features of the present invention with reference to the drawings, FIG. 1 is a schematic cross-sectional view of artificial leather according to a conventional method, and FIG. 2 is a schematic cross-sectional view of artificial leather according to the present invention.

In the case of artificial leather produced by the conventional method using only a binder as shown in Fig. 1, the binder adheres to the tip of the raised naps on the surface, and as a result, the lighting effect is poor. As shown in Figure 2, the artificial leather according to the present invention.

The distribution of the binder in the base layer is relatively uniform, and the binder is also attached to the raised portions, so the texture is soft and there are no wrinkles.

The viscosity of the aqueous binder liquid in the present invention is from 50 to
A range of 1000 ops is suitable.

If the viscosity is less than sO・p-, the desired effect will not be obtained (on the other hand, if the viscosity exceeds 10001-, the desired effect will be obtained, but the effect of the water-soluble agent deposited in post-processing 11 will be reduced, and as a result It lacks the delicate fluff movement that is necessary for suede-like artificial leather.

The viscosity of the aqueous binder can be adjusted using commonly used thickeners (e.g., water-soluble natural polymers such as alginic acid, cellulose, etc., polyvinyl alcohol, polyacrylic, etc.). Sodium-based, polyacrylamide-based, polyethylene oxide-based, polyvinylpyrrolid y
A water-soluble synthetic polymer such as a water-soluble polymer is used.

Depending on the type of binder, these thickeners must be selected to have excellent stability in combination.

On the other hand, water-soluble adhesives to be applied to masterpieces include 47-acid soda adhesives, polyvinyl alcohol adhesives, carboxymethyl cellulose adhesives, and other adhesives used in ordinary printing, as well as emulsion adhesives. applies.

The method of attaching these water-soluble sizing agents to the raised surface of the sheet-like fiber structure is to apply a water-soluble sizing agent solution to the raised surface of the sheet-like fiber structure using a knife coater, a roll coater, a spray method, etc.
It is preferable to use a K coating method.

When applying with a roll coater, the viscosity is 1000~
20000@psQ degree, more preferably 6000-80
00rihata's water-soluble agent solution was applied to the sheet-like fibrous structure at 5°C.
It is best to apply 0 to 200 weight rice cakes.

In this case, if the viscosity is less than 1000 epm, the permeation of the liquid becomes too large and penetrates into the interior of the base layer of the sheet-like fibrous structure, resulting in a product with fine napping and poor shedding. 20000 on the contrary
If it exceeds ip-, the penetration is too low and it is not possible to obtain a soft touch and free movement of piloerection. Also, if the amount of adhesion is less than 40% by weight, it will not be possible to prevent the previously applied binder from forming on the raised part, and if it exceeds 200% by weight, the previously applied binder will not adhere. The effect of adhesion of the raised part becomes too weak and the purpose cannot be achieved.

In the present invention, when a water-soluble glue is attached to the raised surface, it is necessary that the raised surface to which the binder is attached is in an undried state, and the binder is attached to the portions of the sheet-like fiber structure. The binder easily transfers to the subsequently applied water-soluble adhesive liquid, and as a result, no binder adheres at all or only a small amount of binder adheres to the raised portions.

Next, the sheet-like fibrous structure is subjected to a dry heat treatment, and then only the water-soluble sizing agent is extracted and removed by washing and soaping. The dry heat treatment is carried out at 100 to 1150°C for 5 to 10 minutes, and the washing soaping is carried out at 70 to 80°C for 20 to 30 minutes.

By washing and soaping with water, the binder adhered to the tip of the napped part 41 is removed together with the water-soluble glue.

As explained above, the product obtained by the present invention has excellent physical properties, texture, etc., because the base part of the sheet-like fiber structure with raised naps is bonded with a binder made of an elastic polymer. There is no problem with the napping fibers coming off, and the napping area is centered around the tips of the napping [because the binder is not attached at all or only in a small amount, the napping area is uniform and has excellent napping properties, and the napping area is centered on the tip of the napping. A product with a supple touch due to the easy movement of the tip and a soft texture can be obtained.

The present invention will be explained below with reference to Examples.

Example 1 Fiber obtained by wet spinning a copolymer of 92% acrylonitrile* and 8% vinyl acetate
11. Pour acrylic ultra-fine short fibers with a diameter of 3 in length into water to create a dispersion liquid, and then pour it onto a wire mesh! A paper-like product of OP/- was obtained.

On the other hand, polyester filament) 7! A knitted fabric with a fabric weight of 56t/-0 using high shrinkage yarn of $4/36f is placed on a wire mesh of 200 mesh, and the above-mentioned paper-like material is placed on top, and the fabric is heated at 5f/min.
The knitted fabric and the acrylic ultrafine fibers were intertwined and integrated by applying water jet treatment to the top of the paper-like material while moving at a speed of i/min, and then the above-mentioned paper-like material was placed on top of it again and treated in the same manner. Interlaced acrylic microfibers. Thereafter, shrink tin salt was applied in hot water to strengthen entangling properties, and then dried to obtain a composite sheet.

L″1: The obtained composite sheet was dyed using an IL dyeing machine, dried, and then the composite sheet surface was fluffed using a brushing device. After soaking in V-tan aqueous solution and squeezing it with a mangle, use a gastrocoater on the exposed surface of the undried product.
L<viscosity 820010) by changing the coating amount and then drying in a hot air dryer at 140°C.

For comparison, a sample was prepared without applying sodium alginate. Next, it was washed in hot water at 70° C. containing 0.51711 soda ash to remove sodium alginate, and then dried, softened, and sanded with sandpaper in order to obtain a product. The evaluation results of this product are shown in Table 1.

The texture during evaluation was determined by handling, and those that were supple and flexible were rated O.

Also, for the lighting effect, stroke the fluffy surface of the finished product with your finger and check the movement of the fluff and choose a good one.
Bad ones were marked with an X.

To remove the fluff, use a Gakushin League friction tester to rub the product and cotton cloth a certain number of times, and then judge the fluff adhesion to the 2-meter cloth. Good ones are rated O, poor ones are rated ×.

The viscosity was measured using a B-type viscosity needle.

Table 1 -3, 4, 8, 9, and 10 are the methods of the present invention, as shown in Table 1, using polyurethane alone (7) and low viscosity treatment (7).
Compared to Nal)K, the product obtained by the treatment of the present invention was extremely durable and had excellent performance, and its appearance was similar to that of natural suede leather.

゛ Example 2 A dispersion was prepared by adding acrylic ultrafine short fibers of 1 m01 denier and 3 sm fiber length obtained by wet-spinning a copolymer of 92 wt. of acrylonitrile and 8 wt. of vinyl acetate into water. A knitted fabric with a fabric weight of 120 P/- made of woolly processed yarn of 1804760f (acrylic fiber filament) was then formed into a composite in which an acrylic ultrafine short fiber web was laminated on a knitted fabric of acrylic filament processed yarn.

This composite was placed on a 200 mesh wire mesh and subjected to water jet treatment from the side of the acrylic ultrafine short fiber web.

For the water jet treatment, a water jet was jetted at a pressure of 28 kP/an''G using a liquid jet nozzle with a hole diameter of 0.15 m and a hole distance of 1. The distance between the jet nozzle and Kuep was 2 scratches.
The wire mesh with softened web was moved at a speed of 2 Hm/min.

This composite was then guided onto a metal roll with a diameter of 201 mm and, using a similar nozzle, 30 k
When dried by spraying water at a pressure of p/cm''G, a composite sheet with a basis weight of 1921/wl was obtained, #t-length.

The composite sheet thus obtained was dyed in a jet dyeing machine and then dried.

Use this sheet as commercially available emulsion type polycretan 1.
2% alone water-soluble and this emulsion shore type polyurethane (129g) with carboxymethylcellulose added as a thickener, viscosity 320%. After immersing in both Hatake and Shinyu's aqueous solution, squeezing with a mangle, the fluffy surface was left undried. Then, use a roll coater to apply 3-liquid sodium alginate (
Apply 120% of viscosity 8000epm) to 1
Then, it was dried in a hot air dryer at 140°C. The surface was then sanded, followed by soaping, softening treatment, drying, and hair conditioning tin salt treatment by plucking to prepare a product.

The results of evaluating the obtained products are shown in Table 2.

As shown in Table 2 above, the product of the present invention was a suede-like product with a high-quality feel and excellent appearance, feel, and performance.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of suede-like artificial leather prepared using a binder alone in the conventional method, and FIG. 2 is a schematic cross-sectional view of suede-like artificial leather prepared by Honjitsu 1jlK.

Claims (1)

[Scope of Claims] 1. 50 to 1000 in a sheet-like fiber structure having raised naps
After adhering a water-controlling liquid with a viscosity of 100 ml, a water-soluble sizing agent was applied to standing soda in an undried state, and then a dry hot tin layer was applied. A method for preparing suede-like artificial leather having flexible raised naps using tatami mold to remove a water-soluble sizing agent. 2. The method according to claim 1, wherein the sheet-like fiber structure is a sheet-like fiber structure having naps mainly composed of ultrafine fibers of 0.8 denier or less. 3. The method according to claim 1, wherein 50 to 200 weight of water-soluble adhesive is deposited.