KR100614998B1 - Manufacturing method of leather which was well ventilated and leather manufactured by the method - Google Patents

Abstract

The present invention relates to a breathable leather, while coating the coating liquid based on the urethane resin on the upper surface of the brushed layer portion of the brushed fiber while maintaining the feel and breathability of the brushed fiber as it is, the coating liquid can be sufficiently penetrated into the brushed fiber to be cured The purpose of the present invention is to improve washing fastness and to provide a breathable leather manufactured by embossing and a breathable leather manufactured by the method. To achieve the above object, the present invention provides an upper surface of a brushed layer of brushed fiber. 100 wt% of the urethane coating solution prepared by adding acetone or methethylketone to a composition containing polyurethane, calcium carbonate, methyl ethyl ketone, acetone, isocyanate, chlorinated plasticizer and fluorinated silicon to have a viscosity of 3000 to 4000 cps. Coated to 8 to 12 parts by weight, then dried And, by heating and pressing with heated emboss roller it provides an air-permeable leather to a method of manufacturing a breathable leather characterized in that the processing and, that produced by the method of manufacturing the same features.

Description

Manufacturing method and leather manufactured by the method of breathable leather {Manufacturing method of leather which was well ventilated and leather manufactured by the method}

The present invention relates to a breathable leather, and more specifically, by coating a coating liquid based on a urethane resin on the upper surface of the brushed layer portion of the brushed fiber, not only the touch and breathability of the brushed fiber can be maintained as it is, but also excellent washing fastness, embossing It relates to a method for producing leather which is easy to process, and a breathable leather produced by the method.

Conventionally, leather, which is artificially manufactured, has been used in shoes, clothing, sundries, furniture, bags, and sofas, and the leather is generally dried by applying a urethane-based coating solution to a release paper and then drying by applying a urethane-based adhesive, After adhering and compressing the fabric to it, the release paper has been produced by peeling.

However, when the leather is manufactured by the above method, an excess urethane adhesive should be used in order to firmly attach the urethane coating film and the fabric. Accordingly, the texture of the fabric is rapidly degraded, and the manufactured leather has a double urethane film layer. As it contains, not only the breathability is lowered, but also the manufacturing process of leather is complicated, and there are many problems such as increasing productivity and production cost.

Due to the above problems, there have been attempts to improve breathability by forming fine pores in the coating film by adding various additives for forming pores in the urethane coating solution and adhesive.

However, when the pore formation was added to the urethane coating solution and the adhesive as described above, the air permeability was partially improved, but the texture of the prepared leather was lowered and the fastness occurred between the fabric and the coating film, which lowered the fastness. There is a disadvantage that embossing is not easy.

In order to solve the above-mentioned problems, the inventors of the present invention, when coating the coating liquid based on the urethane resin on the upper surface of the brushed layer portion of the brushed fiber to allow the coating liquid to fully penetrate the inside of the brushed fiber to harden the feel of the brushed fiber The present invention was completed after studying a method for manufacturing a breathable leather which prevents the decrease in the friction fastness while maintaining the breathability and facilitates embossing.

Therefore, the present invention maintains the feel and breathability of the brushed fiber while coating the coating liquid based on the urethane resin on the brushed layer portion of the brushed fiber, and improves the washing fastness by allowing the coating liquid to sufficiently penetrate into the brushed fiber and be cured. It is an object of the present invention to provide a method for manufacturing a breathable leather embossed easily.

It is another object of the present invention to provide a breathable leather characterized in that it is produced by the above production method.

In order to achieve the above object, the present invention by adding acetone or methyl ketone to the composition containing polyurethane and calcium carbonate, methyl ethyl ketone, acetone, isocyanate, chlorinated plasticizer and fluorinated silicon on the upper surface of the brushed layer of the brushed fiber The urethane coating solution prepared to have a viscosity of 3000 to 4000 cps is coated to 8 to 12 parts by weight with respect to 100 parts by weight of the brushed fiber and then dried, and then embossed by heat-pressing with a heating roller. To provide.

In another aspect, the present invention provides a breathable leather characterized in that the manufacturing method.

Hereinafter, the present invention will be described in more detail.

In the present invention, first, the urethane coating liquid having a viscosity of 3000 to 4000 cps is coated to 8 to 12 parts by weight based on 100 parts by weight of fabric to prepare a leather.

The brushed fiber can be used natural or chemical brushed fiber, the coating is coated with the coating liquid in the direction of the brushed down by applying a conventional knife coating or roll coating method. Knife coating is used to coat the entire surface of the brushed fiber, and roll coating is used to coat the entire surface of the brushed fiber or only the desired design portion.

According to the present invention it is used in the coating process the viscosity of the urethane coating solution is 3000 to 4000cps. In this case, the urethane coating solution may be prepared by diluting the urethane-based composition used in the manufacture of ordinary leather or leather with an organic solvent to have a viscosity within the above range.

For example, acetone, methyl ketone, or the like, may be added to the composition obtained by kneading the polyurethane solution described in Korean Patent Application Publication No. 94-24162 with calcium carbonate, methyl ethyl ketone, acetone, isocyanate, chlorinated plasticizer and fluorinated silicon. By further adding a volatile organic solvent of may be adjusted to have a viscosity value within the above range can be used.

This viscosity control is to allow the coating liquid to penetrate deeply into the inside of the brushed fiber to be cured, and to improve the friction fastness by preventing the lifting phenomenon between the brushed fiber and the coating liquid while maintaining the feel and breathability of the brushed fiber. It is to let. At this time, when the viscosity of the coating liquid is less than 3000cps, sufficient coating is not made, so that the frictional fastness is lowered and the coating liquid flows down.Therefore, workability is inferior.When the viscosity of the coating liquid exceeds 4000cps, the coating liquid is inside the brushed fiber. This may not be sufficiently penetrated, the lifting phenomenon occurs, the frictional fastness is lowered, the problem of poor breathability and texture. Therefore, it is very important to control the viscosity of the coating liquid within the above range.

The coating liquid having a viscosity within the above range may vary slightly depending on the type of brushed fiber and the length of the brushed hair, but is preferably coated to be 8 to 12 parts by weight based on 100 parts by weight of the brushed fiber. At this time, when the coating amount of the coating liquid is less than 8 parts by weight to 100 parts by weight of the brushed fiber, the coating amount is not sufficient, so that the frictional fastness falls and the thermal pressure embossing, which will be described later, is not easy, and the coating amount exceeds 12 parts by weight. Since there is a problem that the breathability of the manufactured leather is lowered and the touch is lowered, it is preferable to coat the coating liquid within the above range.

As described above, the coating solution is coated on the upper surface of the brushed layer of the brushed fiber and then dried in the present invention. The coated brushed fiber may be dried by passing through a conventional heat drying furnace or dried by passing through a conventional wet heat roller. .

The drying temperature is preferably carried out at 90 to 100 ℃, the drying time may vary slightly depending on the type and use of the leather sheet paper is dried for 1 to 2 minutes, and the clothing paper is dried for 30 to 40 seconds. At this time, if the drying temperature is less than 90 ℃ there is a problem that the sufficient coating liquid hardening does not occur, the friction fastness falls, and if the drying temperature exceeds 100 ℃ excessive curing occurs, the texture is degraded and the heat pressure embossing to be described later is not easy There is a problem. Therefore, it is good to dry in the said temperature range.

When the drying is completed by performing as described above, in the present invention, the thermal embossing is performed. That is, when the coating liquid coated on the brushed fiber is completely dried, it is embossed by passing it through a press using a heating roller engraved with a design of various shapes.

The temperature of the heating roller for embossing may vary depending on the type and application of the leather, but it is preferable to carry out at a temperature higher than the drying temperature for drying the above-described coating liquid, which is easily formed into the design of the design engraved on the heating roller. Emboss is formed. The sheet paper is subjected to heat of 140 to 150 ° C., and the sheet of paper is embossed while heating to 90 to 120 ° C.

In the case where partial coating is performed without coating the coating liquid on the entire surface of the brushed fiber after the heat-pressure embossing, it is preferable to perform a brush processing to give a natural look to the uncoated coating liquid.

When the embossed heat pressure treatment as described above can be manufactured breathable leather according to the present invention, the prepared breathable leather according to the present invention by coating the coating liquid on the upper surface of the brushed layer portion of the brushed fiber, the coating liquid sufficiently penetrates inside the brushed fiber By hardening, while maintaining the air permeability and feel of the brushed fiber, the friction fastness is improved and the embossing is excellent.

Hereinafter, the present invention will be described in more detail with reference to the following examples, which are only presented to aid the understanding of the present invention, but the present invention is not limited thereto.

<Urethane Coating Liquid Preparation Example 1>

Acetone is added to the urethane composition consisting of 50 parts by weight of polyurethane, 10 parts by weight of calcium carbonate, 20 parts by weight of methyl ethyl ketone, 10 parts by weight of acetone, 2 parts by weight of isocyanate, 8 parts by weight of chlorinated plasticizer and 5 parts by weight of fluorinated silicon to obtain a viscosity of 3000 cps. The urethane coating solution was prepared.

<Urethane Coating Liquid Preparation Example 2>

Acetone is added to the urethane composition consisting of 50 parts by weight of polyurethane, 10 parts by weight of calcium carbonate, 20 parts by weight of methyl ethyl ketone, 10 parts by weight of acetone, 2 parts by weight of isocyanate, 8 parts by weight of chlorinated plasticizer and 5 parts by weight of fluorinated silicon, and the viscosity is 4000 cps. The urethane coating solution was prepared.

<Urethane Coating Solution Preparation Example 3>

The viscosity is 2000 cps by adding acetone to the urethane composition consisting of 50 parts by weight of polyurethane, 10 parts by weight of calcium carbonate, 20 parts by weight of methyl ethyl ketone, 10 parts by weight of acetone, 2 parts by weight of isocyanate, 8 parts by weight of chlorinated plasticizer and 5 parts by weight of fluorinated silicon. The urethane coating solution was prepared.

<Urethane Coating Liquid Preparation Example 4>

Acetone is added to the urethane composition consisting of 50 parts by weight of polyurethane, 10 parts by weight of calcium carbonate, 20 parts by weight of methyl ethyl ketone, 10 parts by weight of isocyanate, 2 parts by weight of isocyanate, 8 parts by weight of chlorinated plasticizer and 5 parts by weight of fluorinated silicon to obtain a viscosity of 5000 cps. The urethane coating solution was prepared.

<Example 1>

Coating the coating solution prepared in the urethane coating solution Preparation Example 1 per 1000g of alova brushed fiber at a rate of 100g and then dried by passing through a thermal drying furnace at 100 ° C. for 1 minute, and the 150 ° C. heat press roller with the emboss pattern imprinted thereon The embossed to form embossed leather.

<Example 2>

Reza was prepared in the same manner as in Example 1, except that the coating solution prepared in Preparation Example 2 of the urethane coating solution was used.

<Example 3>

Reza was prepared in the same manner as in Example 1, except that the coating solution prepared in Preparation Example 3 of the urethane coating solution was used.

<Example 4>

Reza was prepared in the same manner as in Example 1, except that the coating solution prepared in Preparation Example 4 of the urethane coating solution was used.

Example 5

Reza was prepared in the same manner as in Example 1 except that the coating solution was coated at a rate of 80 g per 1000 g of brushed fiber.

<Example 6>

Reza was prepared in the same manner as in Example 1, except that the coating solution was coated at a rate of 120 g per 1000 g of brushed fiber.

<Example 7>

Reza was prepared in the same manner as in Example 1, except that the coating solution per 1000 g of brushed fiber was coated at a rate of 60 g.

<Example 8>

Reza was prepared in the same manner as in Example 1 except that the coating solution was coated at a rate of 140 g per 1000 g of brushed fiber.

Example 9

The leather was manufactured in the same manner as in Example 1, except that the temperature of the thermal press roller was performed at 90 ° C.

Experimental Example

The leather prepared in Examples 1 to 9 was measured in the following fastness to wear fastness, breathability, feel and embossability and the results are shown in Table 1 below.

-Wear fastness-

Wear fastness was carried out according to the method of ISO 12947-2, and the applied load was 12KPa.

-Breathable-

It was carried out according to the method of KS K 0570, and breathability was evaluated by the amount of air passing through the fabric of 1 cm 2 for 1 second.

-Touch-

Sensory evaluation was carried out by rubbing the surface of the prepared leather by hand to evaluate the texture of the surface divided into good (◎), normal (○), poor (×).

-Embossability-

The surface of the embossed leather was visually observed to evaluate the degree of formation of the embossed pattern into good (◎), normal (○), and poor (×).

division Friction fastness (times) Breathability (cm 3 / cm 2 / s) touch Embossability Example 1 20000 40 to 45 Good Good Example 2 20000 40 to 45 Good Good Example 3 10000 40 to 45 Good Bad Example 4 10000 10 to 15 Bad usually Example 5 20000 40 to 45 Good Good Example 6 20000 40 to 45 Good Good Example 7 5000 40 to 45 Good Bad Example 8 2000 5 to 10 Bad usually Example 9 10000 40 to 45 usually Bad

As shown in Table 1, in Examples 1, 2, 5, and 6 prepared with leather within the preferred range of the present invention, it can be confirmed that the friction fastness and air permeability, feel and embossability are excellent.

As described above, the present invention maintains the feel and breathability of the brushed fiber while coating the coating liquid based on the urethane resin on the brushed layer portion of the brushed fiber, thereby allowing the coating liquid to sufficiently penetrate and harden into the brushed fiber. It is a useful invention which provides the manufacturing method of the breathable leather which improved washing fastness and made embossing easy, and the breathable leather manufactured by the manufacturing method.

Claims (4)

Urethane coating solution having a viscosity of 3000 to 4000 cps by adding acetone or methethyl ketone to a composition containing polyurethane, calcium carbonate, methyl ethyl ketone, acetone, isocyanate, chlorinated plasticizer and fluorinated silicon on the upper surface of brushed layer of brushed fiber It is coated to 8 to 12 parts by weight with respect to 100 parts by weight of the brushed fiber and then dried, and the embossing process by heat-pressing it with a heating roller. The method for manufacturing breathable leather according to claim 1, which is dried at 90 to 100 ° C in the process of drying after coating of the coating liquid. The method of manufacturing a breathable leather according to claim 2, wherein the heating roller is pressurized with a heating roller to carry out the temperature of the heating roller at a temperature higher than the temperature during the drying process. Breathable leather, characterized in that produced by the method of claim 1 to 3.