CN105256600A - Waterborne superfine fiber synthetic leather with two-sided lines and preparation method thereof - Google Patents

Abstract

The invention provides waterborne superfine fiber synthetic leather with two-sided lines. The waterborne superfine fiber synthetic leather with the two-sided lines is prepared in the mode that the back side and the front side of superfine fiber synthetic leather base cloth are processed in a dry-method face making step through waterborne polyurethane resin, water-based color paste, auxiliaries and the like. The prepared waterborne superfine fiber synthetic leather with the two-sided lines overcomes the defect that not both sides of common superfine fiber synthetic leather can be used as a surface since only single-side lines exist, has the advantage that the two sides can have different lines and different colors, and is widely applied to shoes, cases and other products with the portions with a special two-side requirement.

Description

Water-based microfiber synthetic leather with double-sided texture and preparation method thereof

technical field

The invention relates to the field of synthetic leather, in particular to a water-based microfiber synthetic leather with double-sided grain.

Background technique

Microfiber synthetic leather has almost all the characteristics and advantages of natural leather, and is superior to natural leather in terms of mechanical strength, chemical resistance, quality uniformity, shape retention, and adaptability to automatic cutting and processing; in fullness, softness The properties of high-strength, peeling force, durability, and surface-making are all superior to ordinary polyurethane synthetic leather. It has become the development trend of international artificial leather, and it is the third-generation artificial leather that is most likely to replace real leather. The superfine fiber synthetic leather of the conventional dry method has only one side grain.

The leather straps of bags need to be aesthetically pleasing on both sides. Generally, two layers of leather are used to face the back and then stitched; similarly, the shoe tongue and other parts, in order to satisfy both sides at the same time, use two layers of leather to face the back. Needle car to finish or stitch on the back of the leather for cloth-like materials. Manpower is consumed during processing, and after the sewing thread is broken, the material is divided into two layers, which reduces the service life of the product.

Solvent-based products will emit low-boiling point organic solvents during the production process, causing environmental pollution.

Contents of the invention

The main purpose of the present invention is to overcome the shortcomings of the prior art and provide a water-based superfine fiber synthetic leather with double-sided textures, which overcomes the disadvantages that ordinary superfine fiber synthetic leather has only one-sided texture and cannot be used on both sides at the same time. It can be double-sided with different textures and colors, and the manufacturing process is green and environmentally friendly. It is widely used in shoes, bags and other products with special needs.

The present invention adopts following technical scheme:

In the dry production line, water-based polyurethane resin is used to prepare the back and front of the superfine fiber synthetic leather base cloth, which is specifically achieved through the following steps:

a. 100 parts by weight of water-based polyurethane surface layer resin, 5-15 parts by weight of water-based color paste, 0.1-2 parts by weight of wetting aid, 0.1-3 parts by weight of thickener, and 1-3 parts by weight of water-based crosslinking agent, Use water to adjust the solid content to 25-30%, mix and stir evenly, and use it as a fabric;

b. Mix 100 parts by weight of water-based polyurethane adhesive resin, 5-10 parts by weight of filler, and 0.1-3 parts by weight of thickener with water to adjust the solid content to 40-45%, mix and stir evenly, and use it as a binder;

c. Coat the water-based fabric on the surface of the textured release paper in the dry production line, and dry it in an oven at a drying temperature of 100-130°C to form a surface layer. The thickness of the fabric coating is controlled at 0.8-1.5mm;

d. Coat the bonding material on the fabric layer to form a bonding layer. The coating amount is controlled at 80-100g/square meter, and it is dried in an oven until it is semi-dry. The temperature of the oven is 110-140°C, and then the bonding layer is pasted The roller is bonded to the back of the microfiber leather base cloth and dried in an oven at a temperature of 120-140°C to obtain a primary product consisting of a fabric layer, an adhesive layer and a microfiber leather base cloth. The release paper and Separation of primary products;

e. Use the same equipment and process to form a coating consisting of a surface layer and an adhesive layer on the back of the primary product (the front of the superfine fiber leather base cloth). You can choose different textures and colorants of release paper according to your needs. After drying, separate the release paper from the finished product to obtain water-based microfiber synthetic leather with double-sided texture.

The waterborne polyurethane surface layer resin is at least one of aliphatic and/or aromatic waterborne polyurethanes with a solid content greater than or equal to 30%, a modulus of 50-70 MPa, and excellent wear and scratch resistance.

The waterborne polyurethane adhesive resin is at least one aliphatic and/or aromatic waterborne polyurethane with a solid content greater than or equal to 40%, an adhesive force greater than 3kg/cm, and excellent water and solvent resistance.

The water-based crosslinking agent is at least one of water-based HDI trimer and/or aziridine crosslinking agent.

The water-based thickener is at least one of non-ionic polyurethane and/or water-based polyacrylic acid thickeners.

The filler is at least one of kaolin, light calcium and/or fumed silica which are easily dispersed in the water phase.

As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following beneficial effects:

1. It can overcome the shortcoming that ordinary superfine fiber synthetic leather has only one side texture and cannot be used on both sides at the same time.

2. It has the characteristics of different textures and colors on both sides, and can be widely used in shoes, luggage and other products that have special double-sided requirements.

3. When used in double-sided parts, it can effectively reduce the labor consumption in the processing process and improve the durability of the used parts.

4. Water-based polyurethane is used instead of oil-based polyurethane, which is green and environmentally friendly.

detailed description

The present invention is described in detail by the following examples, it is necessary to point out that the following examples are only used to further illustrate the present invention, and can not be interpreted as limiting the protection scope of the present invention, those skilled in the art can according to the above-mentioned present invention The contents of the invention make some non-essential improvements and adjustments, which still belong to the protection scope of the present invention.

Embodiment one:

For water-based microfiber synthetic leather with double-sided texture, water-based polyurethane resin is used to prepare the back and front of the superfine fiber synthetic leather base cloth in the dry-laid production line. The specific steps are as follows:

a. Mix 100 parts by weight of aliphatic water-based polyurethane surface layer resin, 5 parts by weight of black water-based color paste, 0.3 parts by weight of wetting aid, 1 part by weight of thickener, and 3 parts by weight of water-based HDI trimer. The content is 25%, mixed and stirred evenly, used as fabric;

b. 100 parts by weight of aliphatic water-based polyurethane adhesive resin, 5 parts by weight of kaolin, and 0.2 parts by weight of thickener are adjusted to a solid content of 40% with water, mixed and stirred evenly, and used as a binder;

c. Coat the water-based fabric on the surface of the textured release paper DE43C in the dry production line, and dry it in an oven at a drying temperature of 130°C to form a surface layer. The coating thickness of the fabric is controlled at 1mm;

d. Coat the bonding material on the fabric layer to form a bonding layer. The coating amount is controlled at 100g/square meter, and it is dried in an oven until it is semi-dry. The temperature of the oven is 110°C. The back of the fiber leather base cloth is pasted and dried in an oven at a temperature of 130°C to obtain a primary product consisting of a fabric layer, an adhesive layer and a microfiber leather base cloth, and the release paper is separated from the primary product;

e. Select red color paste, use the same equipment and process to form a coating consisting of a surface layer and an adhesive layer on the back of the primary product, and separate the release paper from the finished product after drying to obtain a red DE43C pattern on the front and a red DE43C pattern on the back. Water-based microfiber synthetic leather with double-sided texture in black DE43C texture.

The water-based microfiber synthetic leather with double-sided texture prepared in this embodiment has a front peel strength of 2.9kg/cm and a back peel of 3.1kg/cm.

Embodiment two:

For water-based microfiber synthetic leather with double-sided texture, water-based polyurethane resin is used to prepare the back and front of the superfine fiber synthetic leather base cloth in the dry-laid production line. The specific steps are as follows:

a. Use 100 parts by weight of aromatic water-based polyurethane surface layer resin, 12 parts by weight of light blue water-based color paste, 0.1 parts by weight of wetting aid, 1.2 parts by weight of thickener, and 2 parts by weight of aziridine crosslinking agent. Adjust the solid content to 30% with water, mix and stir evenly, and use it as a fabric;

b. 100 parts by weight of aromatic water-based polyurethane adhesive resin, 10 parts by weight of light calcium, and 0.2 parts by weight of thickener are adjusted to a solid content of 45% with water, mixed and stirred evenly, and used as a binder;

c. Coat the water-based fabric on the surface of the textured release paper R8 in the dry production line, and dry it in an oven at a drying temperature of 110°C to form a surface layer. The coating thickness of the fabric is controlled at 0.8mm;

d. Coat the bonding material on the fabric layer to form a bonding layer. The coating amount is controlled at 80g/square meter, and it is dried in an oven until it is semi-dry. The temperature of the oven is 120°C. The back of the fiber leather base cloth is pasted and dried in an oven at a temperature of 140°C to obtain a primary product consisting of a fabric layer, an adhesive layer and a microfiber leather base cloth, and the release paper is separated from the primary product;

e. Use the same equipment and process to form a coating consisting of a surface layer and an adhesive layer on the back of the primary product. After drying, separate the release paper from the finished product to obtain a double-sided light blue R8 texture. Water-based microfiber synthetic leather.

The water-based microfiber synthetic leather with double-sided texture prepared by this embodiment has a front peel strength of 2.5kg/cm and a back peel of 3.2kg/cm.

Embodiment three:

For water-based microfiber synthetic leather with double-sided texture, water-based polyurethane resin is used to prepare the back and front of the superfine fiber synthetic leather base cloth in the dry-laid production line. The specific steps are as follows:

a. Mix 100 parts by weight of aliphatic water-based polyurethane surface layer resin, 15 parts by weight of red water-based color paste, 0.6 parts by weight of wetting aid, 1.1 parts by weight of thickener, and 1 part by weight of water-based HDI trimer. The content is 26%, mixed and stirred evenly, used as fabric;

b. 100 parts by weight of aromatic water-based polyurethane adhesive resin, 7 parts by weight of fumed silica, and 0.3 parts by weight of thickener are adjusted to a solid content of 43% with water, mixed and stirred evenly, and used as a binder;

c. Coat the water-based fabric on the surface of the textured release paper R51 in the dry production line, and dry it in an oven at a drying temperature of 100°C to form a surface layer. The coating thickness of the fabric is controlled at 1.5mm;

d. Coat the bonding material on the fabric layer to form a bonding layer. The coating amount is controlled at 100g/square meter, and it is dried in an oven until it is semi-dry. The temperature of the oven is 130°C. The back of the fiber leather base cloth is pasted and dried in an oven at a temperature of 120°C to obtain a primary product consisting of a fabric layer, an adhesive layer and a microfiber leather base cloth, and the release paper is separated from the primary product;

e. Replace the release paper with DE7 and purple color paste. Use the same equipment and process to form a coating consisting of a surface layer and an adhesive layer on the back of the primary product. After drying, separate the release paper from the finished product. Water-based microfiber synthetic leather with double-sided textures of purple DE7 texture on the front and red R51 texture on the back.

The water-based microfiber synthetic leather with double-sided texture prepared by this embodiment has a front peel strength of 2.8kg/cm and a back peel of 3.5kg/cm.

Claims (6)

1. the aqueous ultrafine fiber synthetic leather and preparation method thereof of a two-sided lines, is characterized in that: use waterborne polyurethane resin to carry out the back side to superfine fiber synthetic leather base cloth and face preparation is made in front respectively at dry process production line, realize especially by following steps:

A, by 100 weight portion water-based polyurethane cover resins, 5-15 weight portion aqueous color paste, 0.1-2 weight portion wetting aid, 0.1-3 parts by weight of thickening agent, 1-3 weight portion water cross-linking agent, use water adjustment solid content to be 25-30%, mix and stir, using as fabric;

B, by 100 weight portion water-based polyurethane adhesive resins, 5-10 parts of filler material by weight, 0.1-3 parts by weight of thickening agent, use water adjustment solid content be 40-45%, mix and stir, using as binding material;

C, at dry process production line water-based fabric is coated on the release liners surface of band lines, and through oven for drying, bake out temperature 100-130 DEG C, form surface layer, fabric coating thickness controls at 0.8-1.5mm;

D, binding material is coated on precoat forms tack coat, coating weight control 80-100g/ square meter, and be dried to half-dried through baking oven, oven temperature 110-140 DEG C, then is carried out fitting and entering oven for drying in the back side of tack coat by doubling roller and superfiber leather base cloth, oven temperature 120-140 DEG C, obtains the primary product with precoat, tack coat and superfiber leather base cloth formation, release liners is separated with primary product;

E, identical equipment and process method is adopted to form the coating be made up of surface layer and adhesive linkage at the back side of primary product, the lines of different release liners and the color of mill base can be selected as required, after oven dry, release liners is separated with finished product, obtains the aqueous ultrafine fiber synthetic leather of two-sided lines.

2. the aqueous ultrafine fiber synthetic leather and preparation method thereof of a kind of two-sided lines as claimed in claim 1, is characterized in that: described aqueous polyurethane surface layer resin is at least one in the aliphatic and/or aromatic waterborne polyurethane that solid content is more than or equal to 30%, modulus 50-70MPa, wear-resisting scratch resistance are excellent.

3. the aqueous ultrafine fiber synthetic leather and preparation method thereof of a kind of two-sided lines as claimed in claim 1, it is characterized in that: described aqueous polyurethane adhering resin is that solid content is more than or equal to 40%, bonding force is greater than the excellent aliphatic of 3kg/cm, water-fast solvent resistance and/or aromatic waterborne polyurethane at least one.

4. the aqueous ultrafine fiber synthetic leather and preparation method thereof of a kind of two-sided lines as claimed in claim 1, is characterized in that described water cross-linking agent is at least one in water-based HDI tripolymer and/or aziridine crosslinker.

5. the aqueous ultrafine fiber synthetic leather and preparation method thereof of a kind of two-sided lines as claimed in claim 1, is characterized in that described water-based thickener is at least one in non-ionic polyurethane and/or acid-thickened dose of aqueous polyacrylamide.

6. the aqueous ultrafine fiber synthetic leather and preparation method thereof of a kind of two-sided lines as claimed in claim 1, is characterized in that described filler is at least one in kaolin, fine particle calcium carbonate and/or the aerosil being easy in aqueous phase disperse.