KR20010105991A - Preparation of seat for artificial leather having good antibiosis and deorderization - Google Patents

Abstract

The present invention relates generally to industrial machinery, specifically to apparatus (1) for the manufacture of twisted wire (12) from two or more feed wires (10), whereby the twisted wire (12) is taken up onto a take up spool (3). The take up spool (3) is axially reciprocatingly displaceable along its longitudinal axis (15). The feed wires (10) are advanced through the apparatus by a capstan (19) configured and disposed to be axially aligned with the twisting means (2, 8) of the apparatus (1).

Description

Manufacturing method of artificial leather sheet having excellent antibacterial and deodorizing performance {Preparation of seat for artificial leather having good antibiosis and deorderization}

The present invention relates to a method of manufacturing a sheet for manufacturing artificial leather by filling a polyurethane in a non-woven fabric composed of synthetic fibers, in particular, the structure is dense by impregnating the polyurethane composition in a structure made of composite fibers of 3.5 denier or less capable of miniaturization The present invention relates to a method for producing a sheet for artificial leather with excellent antibacterial and deodorizing performance.

As is well known, leather sheets made by filling microporous polyurethane elastomers with a wet processing method in a microfibrous composite fiber nonwoven fabric and subjected to a series of processes such as fiber miniaturization are widely used as basic materials for artificial leather. Has been.

The manufacturing method of the artificial leather manufacturing sheet consisting of a conventional microfiber nonwoven fabric of less than 0.3 denier and a polyurethane elastic body is as follows.

2 to 5 denier composite fibers capable of microfiber can be opened, carded and cross-laminated to form a web, and then needle punched to produce a three-dimensional interwoven nonwoven fabric.

The nonwoven fabric is shrink-processed to increase the density of the nonwoven fabric, thereby giving a compactness to the sheet, and minimizing the composite fiber by removing all the extracted components of the composite fiber under a solvent such as caustic soda.

The ultra-fine nonwoven fabric is filled with a water-soluble polymer such as polyvinyl alcohol or carboxymethyl cellulose to facilitate post-processing, improve breathability of leather-like sheets, and stabilize the shape of the nonwoven fabric.

The stabilized nonwoven fabric is impregnated with polyurethane, a polymer elastomer, with dimethylformamide solution, solidified in water, and washed with water to fill the polyurethane elastomer inside the nonwoven fabric.

Polyurethane-filled nonwoven fabrics are manufactured into flexible sheets through sand buffing, buffing, and dyeing and softening processes.

In the method of manufacturing artificial leather with a nonwoven fabric sheet, various methods for providing flexibility and various functionalities have been used.

Japanese Patent Application No. 45-20790 and Japanese Patent Application No. 52-49042 show a method of softening a sheet by adding a softening agent and a porous agent in impregnated polyurethane, and Japanese Patent Application No. 89-174678 provides weather resistance. How to do it is shown. In addition, Japanese Patent Application Laid-Open No. 94-122969 discloses a method for imparting conductivity. However, the method of applying antibacterial and deodorization to artificial leather was extremely limited.

In general, the method for imparting the antimicrobial deodorant is treated separately during or after the dyeing process.

If the antibacterial deodorant is treated in this way, the productivity is reduced due to the additional process, and the problem of disproportionation occurs due to poor compatibility of the antibacterial deodorant with other softening agents and dyeing agents, resulting in poor appearance of the final product. do.

Accordingly, an object of the present invention is to provide a sheet for manufacturing artificial leather which is not only the structure is compact and flexible, but also has excellent appearance quality and excellent antibacterial and deodorizing performance.

In addition, an object of the present invention is to improve the productivity and leveling properties by providing antibacterial deodorization performance in the manufacturing process for artificial leather, without additional post-processing during or after the dyeing process.

According to the present invention, a method of manufacturing a sheet for artificial leather by filling a nonwoven fabric made of synthetic fibers with polyurethane, wherein the sheet for artificial leather manufacturing is characterized in that the nonwoven fabric is impregnated with an impregnation solution containing an antimicrobial deodorant and polyurethane. A manufacturing method is provided.

In addition, the impregnating solution is prepared by dispersing by adding 5 to 25 parts with respect to the polyurethane solid content in which the antimicrobial deodorant is added to the impregnation solution is provided.

In addition, there is provided a method for producing an artificial leather sheet, characterized in that the size of the antimicrobial deodorant is a powder type antibacterial deodorant of 0.05 ~ 0.30㎛.

In addition, the antibacterial deodorant is provided a method for producing artificial leather sheet, characterized in that the titanium oxide antibacterial deodorant.

Hereinafter, the present invention will be described in more detail with reference to an example of the manufacturing method of the present invention. However, the present invention is not limited by the following production method.

Synthetic fiber used in manufacturing synthetic fiber nonwoven fabric for manufacturing artificial leather sheet uses polymer material that can form continuous fibrils as a solvent and polymer material that acts as a binder that binds fibrils. Polymeric inter-array fibers, that is, island-in-sea fibers, are mainly used.

The present invention is not limited by the cross-sectional shape, island component or sea component of the composite fiber. In general, in the case of island-in-the-sea composite fiber, polyethylene terephthalate or nylon-6 is used as the island component, and polystyrene, polyethylene, or copolymerized polyester having different solvent soluble properties is used as the sea component.

In particular, in order to increase the density of nonwoven fabrics and to manufacture dense artificial leather, nylon-6 is preferred as the island component, and it is preferable to use polyester or polyethylene copolymerized with 5-sodium sulfoisophthalic acid as the sea component. It can be easily manufactured and is excellent in workability.

The composite fiber can be manufactured in artificial leather sheet after the fineness of the fineness component is less than 1 denier. However, in order to increase the flexibility of the sheet and to consider the surface appearance, the fineness of the island component after the micronization is more preferably 0.1 denier or less. This is not only to obtain a sheet having a flexible and excellent surface appearance, but also to prevent the strong deterioration of the sheet by forming a fine entanglement in three dimensions after the micronization treatment.

In general, three-dimensional interlaced nonwoven fabrics are prepared by stapling islands-in-the-sea composite fibers as described above, and sequentially performing carding, cross-lapping, and needle punching processes in a conventional manner.

The nonwoven fabric thus prepared is shrunk by treatment with hot water at 100 ° C. for 3 to 10 minutes. After the shrinkage process, the nonwoven fabric has a shrinkage of 10 to 20 relative to the area, resulting in higher density, and consequently, a sense of fidelity.

The shrunken nonwoven is micronized with a solution of caustic soda and penetrants. The relationship between weight loss time and caustic soda content is important in the micronization process. In other words, it is preferable to adjust the amount of caustic soda to an appropriate level in consideration of workability because the loss time should be lengthened if the content of caustic soda is small. In general, the reduction time for the extraction of sea components is preferably 5 to 15 minutes, the content of caustic soda is preferably 5 to 20 weight.

The micronized nonwoven fabric is immersed in aqueous polyvinyl alcohol solution, squeezed at a suitable pressure and dried at a temperature of 110 ° C. or higher. Through such a process, polyvinyl alcohol is filled at the intersection of the surface of the fiber and the fiber and the fiber, thereby stabilizing the shape of the nonwoven fabric.

It is important to control the process so that the polyvinyl alcohol is uniformly distributed because the filling state of the polyurethane depends on the distribution or content of polyvinyl alcohol prefilled in the nonwoven fabric, which greatly affects the physical properties of the final product.

Polyvinyl alcohol is filled to fill the polyurethane with a stabilized nonwoven fabric.

The manufacturing method of the artificial leather manufacturing sheet of the present invention is to fill the polyurethane in the non-woven fabric and at the same time to process the antibacterial deodorant, more specifically, to impregnate the non-woven fabric composed of synthetic fibers in the impregnation solution containing the antibacterial deodorant and polyurethane. It is characterized in that the antimicrobial deodorant treatment while filling the polyurethane with a non-woven fabric.

The impregnation solution contains dimethylformamide as a solvent, and includes an antibacterial deodorant and a polyurethane, and may be added a surfactant or a coloring pigment. The antimicrobial deodorant is to impart antimicrobial deodorization performance to the sheet for artificial leather manufacturing and is preferably excellent in dispersibility.

In the present invention, it is preferable that the impregnation liquid is sufficiently dispersed. If the impregnating solution is not sufficiently dispersed, the filling and antibacterial deodorization treatment of polyurethane is not uniformly made on the nonwoven fabric, so the touch and antimicrobial properties of the final product are uneven, which is not preferable.

The amount of polyurethane and other processing agents added to the impregnation solution depends on the concentration of the impregnation solution, the gap between the impregnation rolls and the density of the nonwoven fabric to be impregnated. Therefore, it is preferable to properly adjust according to the characteristics of the nonwoven fabric filled with polyvinyl alcohol.

In the present invention, the antimicrobial deodorant added to the impregnation solution is preferably dispersed in 5 to 25 parts with respect to the polyurethane solid content added to the impregnation solution.

If the antibacterial deodorant added to the impregnation solution is less than 5 parts of the polyurethane solids added to the impregnation solution, the antibacterial performance of the manufactured artificial leather sheet is deteriorated, which is not preferable. When more than 25 parts of the polyurethane solid content is added to the antibacterial performance of the manufactured artificial leather sheet is excellent, but the amount of the solid content impregnated into the sheet is excessive, so the touch of the sheet itself is not preferable.

The antibacterial deodorant of the present invention is preferably a powdered antibacterial deodorant having a size of 0.05 ~ 0.30㎛.

If the size of the antimicrobial deodorant is smaller than 0.05 μm, it is not preferable because the antimicrobial deodorant together with the dimethylformamide escapes from the nonwoven fabric when polyurethane coagulates. As the dispersibility in the liquid becomes worse, the filling of the polyurethane into the sheet and the antibacterial and deodorizing treatments become uneven, which is undesirable.

In addition, if the antimicrobial deodorant is a liquid, it is water-soluble, and when mixed with polyurethane, it cannot be used because it is coagulated, and a powder type is preferable.

The antibacterial deodorant of the present invention is preferably a titanium oxide antibacterial deodorant.

Titanium oxide antimicrobial deodorant is a photocatalyst applied sterilizer, which is heated to 30,000 ℃ or more when it receives sunlight or fluorescent light to sterilize bacteria and decompose pollutants to deodorize various odors.

In the manufacturing method of the present invention, after impregnating a nonwoven fabric with an impregnating solution containing a polyurethane and an antibacterial deodorant, it is preferable to squeeze to have a thickness of about 50 to 80 of the previous process thickness to fill the polyurethane and the antibacterial deodorant together. Do.

The nonwoven fabric is filled with polyurethane and an antibacterial deodorant and then coagulated in a coagulation bath. As for the temperature of a coagulation tank, 30-40 degreeC is preferable, and, as for the density | concentration of the dimethylformamide in a coagulation tank, 5-30 are preferable.

The solidified nonwoven fabric is sufficiently washed with water at 80 to 90 ° C. to completely remove polyvinyl alcohol, which is a water-soluble binder. After removing the polyvinyl alcohol, the sheet obtained is cut into two sheets having a thickness of half through a slicing process, and the buffing and dyeing processes are sequentially performed.

Artificial leather manufacturing sheet produced by the manufacturing method of the present invention is not only excellent antimicrobial and anti-fog, but also can increase the productivity and solve the problem of uneven salt by performing antibacterial deodorization treatment at the same time when filling the polyurethane. Artificial leather manufacturing sheet produced by the manufacturing method of the present invention can be produced in various forms through a variety of post-processing.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, the present invention is not limited by the following examples.

<Examples 1 to 2 and Comparative Examples 1 to 3>

An island-in-the-sea composite fiber staple having a fineness of 3.5 denier, a length of 51 mm and a crimp number of 12 to 18 pieces / inch was prepared using 70 parts of nylon-6 as a island component and 30 parts of copolyester as a sea component. The island-in-sea composite fiber staples thus prepared were opened, carded and needle punched to produce a three-dimensional entangled needle punching nonwoven fabric having a weight of 700 g / m 2, a thickness of 3.15 mm, and an apparent density of 0.222 g / cm 3.

The prepared nonwoven fabric was shrunk by treatment with hot water at 100 ° C. for 5 minutes. The area shrinkage rate at this time was 10.

The heat-shrinkable nonwoven fabric was weight-reduced continuously in 10 caustic soda solution and 1 ionic penetrant aqueous solution for 8 minutes, washed with water at 80 ° C. and dried. The fineness of the composite fiber micronized by the weight reduction process was 0.07 denier.

The non-woven fabric, which was micronized by the weight reduction process, was padded in an aqueous polyvinyl alcohol solution having an average degree of polymerization of 500 and dried to stabilize the form.

In order to impart elasticity and antimicrobial properties to the stabilized nonwoven fabric, the polyurethane solids in which the titanium oxide powder type antibacterial deodorant was added to the impregnation solution were dispersed in pure dimethylformamide at the dosages shown in Table 1, and then 100 modulus was 30. An impregnation solution having a concentration of 12 wt% was prepared by completely dissolving 100 wt% of polyether-based polyurethane (kgf / cm 2), 2 wt% of a surfactant, and 0.02 wt% of a colored pigment in a dimethylformamide solution in which the antimicrobial deodorant was dispersed. At this time, the size of the powder-type antibacterial deodorant was as shown in Table 1.

The prepared impregnation solution was impregnated with a non-woven fabric stabilized in polyvinyl alcohol to fill a polyurethane and simultaneously treated with an antibacterial deodorant. At this time, padding with a gap of 80 to sufficiently fill the polyurethane and wet coagulation in a coagulation bath consisting of 80 parts of water and 20 parts of dimethylformamide. The nonwoven fabric coagulated in the coagulation bath was washed with a water bath at 90 ° C. to completely remove polyvinyl alcohol and to dry it.

The amount of polyurethane filled in the dried nonwoven fabric is shown in Table 1. The amount of polyurethane at this time is the weight with respect to the sheet.

The sheet thus prepared was cut into two sheets having a thickness of half through a slicing process, and the surface of the sheet was buffed by buffing the opposite side of the cut surface.

The prepared sheet was dyed under normal conditions and measured and evaluated antimicrobial, amiability, touch, and appearance (equilibrium) after treatment with the softener.

<Table 1>

division Size of antibacterial deodorant Input amount of antibacterial deodorant The amount of polyurethane filled in the dried nonwoven Example 1 0.3 μm Part 5 33 weight Example 2 0.05 μm Part 25 35 weight Comparative Example 1 0.3 μm Part Three 33 weight Comparative Example 2 0.3 μm Part 30 36 weight Comparative Example 3 0.03 μm Part 30 36 weight

<Table 2>

division Antimicrobial Degree () Bangmido touch Appearance (Glucolytic) ATCC9642 ATCC9644 Example 1 98.6 - - Great Great Example 2 99.7 - - Great Great Comparative Example 1 56.5 + + Great Great Comparative Example 2 99.7 - - Below average usually Comparative Example 3 53.5 + + Great Great

* Antibacterial measurement method: was measured by the method of ATCC 6538 (KSK-0693), and evaluated after washing 5 times using Staphyfocoocus (Staphyfocoocus) bacteria.

* Measuring degree of taste: measured by the method of ATCC9642 (used bacteria: Aspergillus niger) and ATCC9644 (used bacteria: penicillium pinophilum), the growth rate of mold after 10 washes Evaluated as. At this time,-indicates that the mold did not grow, but disappeared, + indicates that the mold grew.

* Tactile and external (measuring) measurement method: evaluated by sensory tests of five artificial leather technicians.

As shown in the above examples, the artificial leather manufacturing sheet manufactured by the manufacturing method of the present invention has excellent antibacterial and aroma, and can be seen that it is excellent in appearance (economy). As described above, the present invention is a novel and useful invention that can solve the problems caused by the conventional antimicrobial deodorization treatment or perform separate treatment and obtain the effect of improving productivity.

Claims (4)

A method of manufacturing a sheet for manufacturing artificial leather by filling a nonwoven fabric composed of synthetic fibers with a polyurethane, the method of manufacturing a sheet for manufacturing artificial leather, comprising impregnating a nonwoven fabric with an impregnation solution containing an antibacterial deodorant and a polyurethane. The method according to claim 1, wherein the impregnating solution is dispersed by adding 5 to 25 parts of the polyurethane solid content into which the antimicrobial deodorant is added to the impregnation solution. The method of claim 1, wherein the size of the antibacterial deodorant is 0.05 ~ 0.30㎛ powder type antibacterial deodorant manufacturing method of artificial leather manufacturing sheet. The method of claim 1, wherein the antibacterial deodorant is a titanium oxide antibacterial deodorant.