CN1536164A - Pull-up discoloring superfine fiber artificial leather and manufacturing method thereof - Google Patents

Abstract

The invention relates to a pull-up discoloring superfine fiber artificial leather which comprises a base material, a Polyurethane layer arranged on the base material, and a wax layer arranged on the PU layer. The invention also provides a manufacturing method of the pull-up discoloring artificial leather. The discolored leather according to the present invention can be restored to its original shape by rubbing the wrinkled or scratched portion for several tens of seconds, even if the wrinkled or scratched portion is accidentally scratched by an external force after the leather is produced. In addition, the pull-up discolored leather according to the present invention has natural luster and vivid color.

Description

Pull-up discoloration microfiber artificial leather and manufacturing method thereof

technical field

The invention relates to a superfine fiber artificial leather and a manufacturing method thereof, in particular to a superfine fiber artificial leather that changes color by pulling up and a manufacturing method thereof.

Background technique

Among leather products, there is a pull-up leather whose surface changes color when pulled. According to known technology, utilize following steps to manufacture this pull-up discoloration leather. Firstly, impregnate the base material of ordinary fiber non-woven fabric or woven fabric in polyurethane (PU) coating, and then perform steps such as coagulation, washing and drying on the impregnated base material, thereby obtaining a semi-finished synthetic leather product. In addition, a layer of color-changing paint comprising PU resin, wax, and coloring material is coated on a textured release paper to form a surface layer, and a layer of adhesive for subsequent use is coated on the surface layer. Finally, the surface layer is adhered to the semi-finished product with the following adhesive. After tearing off the release paper, a synthetic leather 100 as shown in FIG. 1 is obtained. The synthetic leather 100 includes a synthetic leather semi-finished product 102 and a surface layer 104 that can be pulled up and changed color is disposed on the synthetic leather semi-finished product 102 .

The advantage of pull-up color-changing leather is that the texture and liveliness of genuine leather can be shown through the irregular color layers on its surface. However, although the artificial leather produced by the above-mentioned known method can produce a layered sense of color by pulling, once the surface is pulled and discolored, it is difficult to return to the original color. In addition, once the known pull-up and discolored leather is made into products, it is very easy to produce marks (such as wrinkles or scratches) that are not easy to recover due to careless external force, and these marks often need to be heated by hot air for more than a few minutes. It is possible to return to the original state. The aforementioned synthetic leather also has another shortcoming, that is, the dull color of its surface is not as glossy and natural and bright-coloured as the genuine leather surface.

Contents of the invention

The object of the present invention is to provide a pull-up color-changing microfiber artificial leather that can easily restore the original appearance.

Another object of the present invention is to provide a pull-up color-changing microfiber artificial leather with genuine leather luster and natural color.

In order to achieve the above and other objects, the present invention provides a pull-up color-changing microfiber artificial leather, which comprises a microfiber substrate, a polyurethane (PU) layer on the substrate, and a wax layer on the polyurethane layer superior. The thickness of the substrate is preferably in the range of 0.1 mm to 3 mm.

The wax layer is formed of paraffin or naphthenic oil, ethylene synthetic wax, solid wax or liquid paraffin. The pull-up discoloration microfiber artificial leather provided by the present invention may further include a surface resin layer disposed on the wax layer. The surface resin layer is formed by a resin composition, and the resin composition includes casein, polyurethane resin and/or acrylic resin. Preferably, the weight percentages of the casein, the polyurethane resin and the acrylic resin in the resin composition are 1-15%, 10-30% and 0-10%, respectively.

The invention also provides a method for manufacturing the pull-up discoloration leather, the main steps of which are as follows. Firstly, a layer of polyurethane composition for coating is coated on the surface of the microfiber substrate, and the coated substrate is solidified, washed with water and dried to form the semi-finished product with the polyurethane layer. Then apply a layer of wax on the surface of the polyurethane layer, and iron the wax layer at high temperature. After that, another layer of resin composition can be coated on the wax layer, and the surface resin layer can be ironed at high temperature. It is also possible to emboss the surface of the polyurethane layer so that the surface has natural lines, and then coat a layer of wax on the surface of the polyurethane layer.

In the coating step of the wax layer, the wax can be coated on the polyurethane layer by means of spray coating, printing coating or reverse roller coating.

Preferably, under the 100% stress test, the resin composition suitable for the method comprises casein, polyurethane resin and acrylic resin at 80-150Kg/cm ² , 60-130Kg/cm ² and 230- 270Kg/cm ² .

After the pull-up color-changing leather of the present invention is made into a product, even if wrinkles or scratches are caused by accidental external force, the original shape can be restored by rubbing the wrinkled or scratched parts for tens of seconds. In addition, the pull-up color-changing leather according to the present invention has natural luster and vivid color.

Description of drawings

In order to make the above and other objects, features, and advantages of the present invention more apparent, preferred embodiments of the present invention are specifically cited below and described in detail with accompanying drawings.

Fig. 1 is a sectional view of a known pull-up color-changing synthetic leather; and

Fig. 2 is a cross-sectional view of the pull-up discoloration microfiber artificial leather according to an embodiment of the present invention.

〖Description of drawing number〗

100. Synthetic leather

102. Synthetic leather semi-finished products 104. Surface layer

200. Superfine fiber artificial leather

202. Superfine fiber substrate 204. Polyurethane layer

206. Wax layer 208. Surface resin layer

Detailed ways

The pull-up discoloration microfiber artificial leather of the present invention will be described below with reference to FIG. 2 . The pull-up discoloration artificial leather 200 includes a superfine fiber substrate 202 , a polyurethane layer 204 , a wax layer 206 and a surface resin layer 208 .

The substrate 202 is preferably obtained by impregnating a base cloth of ultrafine fibers (fiber fineness of about 0.5 denier to about 0.0001 denier) with polyurethane coating, followed by steps of solidification, washing, drying and weight reduction. The artificial leather substrate. The base fabric can also be treated as an artificial leather base material after being treated by steps such as weight reduction, impregnated with polyurethane paint, and then treated by steps such as coagulation, washing, and drying. The thickness of the substrate is preferably in the range of about 0.1 mm to about 3 mm.

Referring to Fig. 1, the known pull-up color-changing synthetic leather 100 has only one layer of surface layer 104 mixed with polyurethane resin and color-changing material on the base material 102. Or after being accidentally wrinkled or scratched by external force, it is difficult to return to its original shape. Referring to Fig. 2, the pull-up discoloration microfiber artificial leather 200 of the present invention has a layer of polyurethane layer 204 that provides leather texture and color on the base material 202, and also has a wax layer that helps to produce the pull-up discoloration effect 206, a surface resin layer 208 may also be added to make the artificial leather have a leather-like luster. The pull-up color-changing leather with this structure not only has natural luster and bright color, but also the place that has been discolored by pulling up can easily return to its original color by rubbing. In addition, even if wrinkles or scratches are caused by accidental external force after the top pull color-changing leather of the present invention is made into a product, it is sufficient to rub the wrinkled or scratched parts for tens of seconds. Restore.

According to an embodiment of the present invention, the wax layer 206 is formed of paraffin or naphthenic oil, ethylene synthetic wax, solid wax or liquid paraffin. The surface resin layer 208 is formed of a resin composition. The so-called resin composition in the present invention includes casein, polyurethane resin and/or acrylic resin. The so-called polyurethane resin and/or acrylic resin in the present invention are preferably water-soluble or water-dispersible resins. Optimally, the weight percentages of the casein, the polyurethane resin and the acrylic resin in the resin composition are about 1-15%, about 10-30% and about 0-10%, respectively.

In addition, under the 100% stress test, the resin composition suitable for this method preferably contains casein in the range of 80 kg/cm ² to 150 kg/cm ² . When the casein is less than 80kg/cm ² , the surface brightness of the artificial leather will be insufficient; when the casein is greater than 150kg/cm ² , the surface of the artificial leather will be easily cracked. Under the 100% stress test, the polyurethane resin and acrylic resin suitable for the present invention are preferably about 60 kg/cm ² to about 130 kg/cm ² and about 230 kg/cm ² to about 270 kg/cm ² . The so-called 100% stress test includes the following steps. First, after the material to be tested is coated on a release paper (coating thickness GAP = 0.2mm), it is moved into an oven and baked at 60°C for 30 minutes, then baked at 120°C for 30 minutes, and then baked at 120°C for 30 minutes. Let stand at room temperature for 24 hours. Then, after baking, cut the test piece with a length of 10 cm and a width of 1 cm as a test piece, first measure the thickness of the test piece, and then place the test piece in a tensile testing machine (the distance between the upper and lower clamps is 2 cm) for testing. Test the breaking strength of the test piece, divide the breaking strength by 2cm and multiply by 100% to obtain the elongation (100%) of the resin, then divide the elongation (100%) (in Kg) by (test piece Thickness multiplied by 1cm), that is, 100% stress test results.

It should be noted that in the pull-up color-changing artificial leather provided by the present invention, although the surface resin layer 208 can make the artificial leather have a leather-like luster, the artificial leather formed by other structures without the surface resin layer 208 It has the effect of pull-up discoloration and can be restored to its original color by friction. Therefore, in the pull-up color-changing artificial leather provided by the present invention, the surface resin layer 208 is an optional structure.

The invention also provides a method for manufacturing the pull-up discoloration leather, the main steps of which are as follows. First, coating a polyurethane composition with a thickness of about 0.1 mm to about 0.5 mm on the surface of the microfiber substrate, and solidifying, washing and drying the coated substrate, Make the formed polyurethane layer elastic.

The surface of the polyurethane layer can also be treated, and the embossing step is used to make the surface have natural textures (such as capillary pores), presenting a texture similar to genuine leather.

Then coat a layer of wax with a thickness of about 1 μm to about 10 μm on the surface of the polyurethane layer, and iron the wax layer at a temperature of about 220°F-320°F. After that, it is preferable to coat a resin composition with a thickness of about 1 μm to about 10 μm on the wax layer, and iron the surface resin layer at a temperature of about 220°F-320°F, thereby obtaining a Pull-up color-changing faux leather.

In addition, in the wax coating step, the wax can be coated on the polyurethane layer by spray coating, printing coating or reverse roller coating.

The following examples are used to describe the present invention in detail, but not to limit the present invention.

Example 1

A non-woven fabric is made of sea-island microfibers whose island composition is nylon 6 (Nylon 6, BASF). The non-woven fabric was impregnated with an impregnating polyurethane coating comprising a polyurethane composition and dimethylformamide (DMF) in a weight ratio of 40:60. The impregnated non-fabric was washed with water at 90°C and dried at 140°C. Then, the sea component of the island-in-sea superfine fiber is removed by a weight reduction process, so that the treated non-woven fabric forms a superfine fiber artificial leather substrate.

After the artificial leather substrate is ground and dyed, a polyurethane colorant composition solution with a weight percentage of 35% of polyurethane is coated on the artificial leather substrate. The coated base material is subjected to processes such as coagulation, water washing, and drying to form a polyurethane layer on the base material.

First emboss the polyurethane layer with a wheel engraved with cowhide texture, then spray ethylene synthetic wax with a viscosity of 5mpa. Iron flat. Then spray the resin composition on the wax layer to form a 2.5 μm thick film, and use 280°F to iron the surface resin to obtain a natural texture, pull-up discoloration effect and recovery after rubbing Color microfiber faux leather. The resin composition is prepared from a casein composition, a polyurethane resin composition and an acrylic composition with a weight ratio of 100:80:20, wherein the casein solid content of the casein composition is 14%, The solid content of the polyurethane resin of the polyurethane resin composition is 38% and the solid content of the acrylic resin of the acrylic resin composition is 41%, and under the 100% stress test, the casein, polyurethane resin and acrylic resin 100kg/cm ² , 50kg/cm ² and 250kg/cm ² .

Example 2

A non-woven fabric is made of sea-island microfibers whose island composition is nylon 6 (Nylon 6, BASF). The non-woven fabric was impregnated with an impregnating polyurethane coating comprising a polyurethane composition and dimethylformamide (DMF) in a weight ratio of 40:60. The impregnated non-fabric was washed with water at 90°C and dried at 140°C. Then, the sea component of the island-in-sea superfine fiber is removed by a weight reduction process, so that the treated non-woven fabric forms a superfine fiber artificial leather substrate.

On the artificial leather base material, a polyurethane colored material composition solution with a weight percentage of 35% of polyurethane is coated. The coated base material is subjected to processes such as coagulation, water washing, and drying to form a polyurethane layer on the base material. The artificial leather substrate was dyed with acid dye (Lanacron Brown SGR) 5% owf at a constant temperature of 90° C. for 40 minutes, and then washed with water to obtain a colored artificial leather semi-finished product.

First emboss the polyurethane layer with a wheel engraved with a cowhide pattern, and then spray ethylene synthetic wax with a viscosity of 5 mpa.s at room temperature on the polyurethane layer to form a film with a thickness of 3 μm. The wax film was ironed at 260°F, and then the resin composition was prepared by taking a casein composition, a polyurethane resin composition and an acrylic composition in a weight ratio of 100:80:20, wherein the casein The casein solid content of the composition is 14%, the polyurethane resin solid content of the polyurethane resin composition is 38%, and the acrylic resin solid content of the acrylic resin composition is 41%, under 100% stress test, and the Cream casein, polyurethane resin and acrylic resin are respectively 100kg/cm ² , 50kg/cm ² and 250kg/cm ² , sprayed on the wax layer to form a 2.5μm thick film, and utilize 280 ° F to make the surface resin film After ironing, a superfine fiber artificial leather with natural texture, pull-up discoloration effect and color recovery after rubbing can be obtained.

Example 3

A fabric is made from island-in-sea microfibers whose island composition is nylon 6 (Nylon 6, BASF). Then, the sea component of the island-in-sea microfiber is removed by a weight reduction process, so that the treated fabric forms a superfine fiber substrate. The microfiber substrate was impregnated with impregnating polyurethane coating (containing polyurethane composition and dimethylformamide (DMF) in a weight ratio of 40:60). On the impregnated microfiber base material, a polyurethane colorant composition solution with a polyurethane weight percentage of 35% is coated. After that, the microfiber substrate was solidified, washed with water at 90°C, and dried at 140°C. Form a microfiber artificial leather substrate.

Emboss on the polyurethane layer of the superfine fiber artificial leather substrate with a wheel engraved with cowhide texture, and then spray ethylene synthetic wax with a viscosity of 5 mpa.s at room temperature on the polyurethane layer to form a 3 μm thick film. 260°F irons the wax film flat. Then spray the resin composition on the wax layer to form a 2.5 μm thick film, and use 280°F to iron the surface resin to obtain a natural texture, pull-up discoloration effect and recovery after rubbing Colored microfiber faux leather.

Comparative Example 1

Impregnate general fiber non-woven fabrics with impregnated polyurethane coatings (including polyurethane composition and dimethylformamide (DMF) in a weight ratio of 40:60), and after the impregnated non-woven fabrics are solidified, wash with water at 90°C and dry at 140°C. A synthetic leather substrate is formed.

Coating one-component polyurethane color-changing paint on the release paper printed with lines, wherein the one-component polyurethane color-changing paint includes polyurethane resin (Taijing Company) and color-changing material (Qingfengfa Company). The paint is dried at 120° C. to form a one-sided layer, and then a two-component polyurethane paint is coated on the surface layer as an adhesive layer, and the surface layer is attached to the synthetic leather substrate. After the adhesive layer is hardened, the release paper is torn off to obtain a textured synthetic leather that can be pulled up and changed color.

Comparative example 2

The impregnated fabric is impregnated with impregnated polyurethane coating (including polyurethane composition and dimethylformamide (DMF) in a weight ratio of 40:60), and the impregnated fabric is solidified, washed at 90°C and dried at 140°C to form a synthetic Leather base.

A polyurethane color-changing coating is coated on the synthetic leather substrate, wherein the polyurethane color-changing coating includes polyurethane resin (Taijing Company) and color-changing material (Qingfengfa Company). The coating is then scalded and formed into a synthetic leather that can be pulled up and changed in color.

The microfiber artificial leather obtained in Example 1 and Example 2 of the present invention is compared with the synthetic leather obtained in Comparative Example 1 and Comparative Example 2, and the results are shown in Table 1 below.

Table 1 leather gloss natural color change discoloration recovery Brightness of color Example 1 ○ ○ ○ ○ Example 2 ○ ○ ○ ○ Example 3 ○ ○ ○ ○ Comparative example 1 x x x x Comparative example 2 x x x x

As can be seen from Table 1, the pull-up discoloration microfiber artificial leather obtained according to Examples 1, 2 and 3 of the present invention has the genuine leather luster that the pull-up discoloration synthetic leather obtained according to Comparative Examples 1 and 2 does not have Sensation, natural sense of discoloration, discoloration recovery, color brightness.

Although the present invention has been disclosed in the application of the present invention with reference to the details of the preferred embodiments of the invention, it should be understood that the disclosure is by way of illustration rather than limitation, and anyone skilled in the art will not depart from the spirit of the present invention. and to the extent that modifications are foreshadowed. Therefore, the protection scope of the present invention should be determined by the scope defined in the claims.

Claims (26)

1, draw variable color superfine fibre artificial leather on a kind of, it is characterized in that this artificial leather comprises:

The superfine fibre base material;

Layer of polyurethane is formed on the front of this base material; And

The wax layer is formed on this layer of polyurethane.

2, draw variable color superfine fibre artificial leather on as claimed in claim 1, wherein the thickness of this superfine fibre base material is 0.1mm to 3mm, and the fibre fineness of this superfine fibre is the red Buddhist nun of 0.5 red Buddhist nun to 0.0001.

3, draw variable color superfine fibre artificial leather on as claimed in claim 1, wherein this wax layer is to be formed by wax, and this wax is for selecting in the colony that is made up of paraffin class finish, naphthenic finish, ethene synthetic wax, solid wax and atoleine.

4, draw variable color superfine fibre artificial leather on as claimed in claim 1, this artificial leather comprises surface resin layer in addition and is formed on this wax layer.

5, draw variable color superfine fibre artificial leather on as claimed in claim 4, wherein this surface resin layer is to be formed by resin combination, and this resin combination comprises lactic casein and polyurethane resin.

6, draw variable color superfine fibre artificial leather on as claimed in claim 5, wherein the percentage by weight of this lactic casein in this resin combination is that 1-15% and the percentage by weight of this polyurethane resin in this resin combination are 10-30%.

7, draw variable color superfine fibre artificial leather on as claimed in claim 5, wherein the lactic casein in this resin combination is 80kg/cm under 100% stress test ²To 150kg/cm ²

8, draw variable color superfine fibre artificial leather on as claimed in claim 5, wherein the polyurethane resin in this resin combination is 60kg/cm under 100% stress test ²To 130kg/cm ²

9, draw variable color superfine fibre artificial leather on as claimed in claim 5, wherein this resin combination comprises acryl resin in addition.

10, draw variable color superfine fibre artificial leather on as claimed in claim 9, wherein the percentage by weight of this lactic casein in this resin combination is 1-15%; The percentage by weight of this polyurethane resin in this resin combination is 10-30%; And the percentage by weight of this acryl resin in this resin combination is 1-10%.

11, draw variable color superfine fibre artificial leather on as claimed in claim 9, wherein the acryl resin in this resin combination is 230kg/cm under 100% stress test ²To 270kg/cm ²

The manufacture method of drawing variable color superfine fibre artificial leather on 12, a kind of is characterized in that the method includes the steps of:

The polyurethane coating of coating one deck coating usefulness on the superfine fibre base material is to form layer of polyurethane; And

Coating one deck wax on this layer of polyurethane is to form the wax layer.

The manufacture method of drawing variable color superfine fibre artificial leather on 13, as claimed in claim 12, wherein the coating thickness of the polyurethane coating of this coating usefulness is 0.1mm to 0.5mm, and the coating thickness of this wax is 1 μ m to 10 μ m.

The manufacture method of drawing variable color superfine fibre artificial leather on 14, as claimed in claim 12, wherein the thickness of this superfine fibre base material is 0.1mm to 3mm, the fibre fineness of this superfine fibre is the red Buddhist nun of 0.5 red Buddhist nun to 0.0001.

The manufacture method of drawing variable color superfine fibre artificial leather on 15, as claimed in claim 12, wherein this method is included in after this layer of polyurethane of formation in addition and before coating wax, the embossing step is carried out on this layer of polyurethane surface make its this surface have natural lines.

The manufacture method of drawing variable color superfine fibre artificial leather on 16, as claimed in claim 12 wherein is to utilize the mode of spraying, printing coating or contrary roller coating that wax is coated on this layer of polyurethane in the step that forms the wax layer.

The manufacture method of drawing variable color superfine fibre artificial leather on 17, as claimed in claim 12, wherein this wax is for selecting in the colony that is made up of paraffin class finish, naphthenic finish, ethene synthetic wax, solid wax and atoleine.

The manufacture method of drawing variable color superfine fibre artificial leather on 18, as claimed in claim 12, wherein this method is contained in coating one deck resin combination on this wax layer in addition, to form surface resin layer.

The manufacture method of drawing variable color superfine fibre artificial leather on 19, as claimed in claim 18, wherein the coating thickness of this surface resin constituent is 1 μ m to 10 μ m.

The manufacture method of drawing variable color superfine fibre artificial leather on 20, as claimed in claim 18, wherein this surface resin constituent comprises lactic casein and polyurethane resin.

The manufacture method of drawing variable color superfine fibre artificial leather on 21, as claimed in claim 20, wherein the percentage by weight of this lactic casein in this resin combination is that 1-15% and the percentage by weight of this polyurethane resin in this resin combination are 10-30%.

The manufacture method of drawing variable color superfine fibre artificial leather on 22, as claimed in claim 20, wherein the lactic casein in this resin combination is 80kg/cm under 100% stress test ²To 150kg/cm ²

The manufacture method of drawing variable color superfine fibre artificial leather on 23, as claimed in claim 20, wherein the polyurethane resin in this resin combination is 60kg/cm under 100% stress test ²To 130kg/cm ²

The manufacture method of drawing variable color superfine fibre artificial leather on 24, as claimed in claim 20, wherein this resin combination comprises acryl resin in addition.

The manufacture method of drawing variable color superfine fibre artificial leather on 25, as claimed in claim 24, wherein the percentage by weight of this lactic casein in this resin combination is 1-15%; The percentage by weight of this polyurethane resin in this resin combination is 10-30%; And the percentage by weight of this acryl resin in this resin combination is 1-10%.

The manufacture method of drawing variable color superfine fibre artificial leather on 26, as claimed in claim 24, wherein the acryl resin in this resin combination is 230kg/cm under 100% stress test ²To 270kg/cm ²

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