CN101586311A - Production process of environmental protection PU composite leather and formula thereof - Google Patents

Abstract

Environmentally friendly PU synthetic leather production process, semi-finished base: prepare the base with PU mixed liquid to impregnate and coat on the non-woven fabric; put it into a liquid that has affinity with solvent but has no affinity with PU resin for wet process Film forming, shaping and drying; semi-finished leather: dissolve the dry-process PU resin, prepare the PU mixture for the skin layer; apply the mixture for the skin layer on the release paper, dry and cool, and then coat the skin layer with adhesive Paste the semi-finished base with the layering mixture, peel off the release paper after drying to obtain semi-finished leather; post-treatment: mix nano-scale modified aliphatic PU resin and cross-linking agent to prepare nano-scale treatment agent and roll coat the semi-finished PU Synthetic leather is made of environmentally friendly PU synthetic leather. Wet process formula: wet process PU resin, DMF, surfactant, color paste, dry process formula: dry process PU resin, DMF, MEK, toner; third stage post-treatment formula: modified aliphatic PU resin, crosslinking agent.

Description

Environmentally friendly PU synthetic leather production process and formula

technical field

The invention relates to a production process and formula of PU synthetic leather, in particular to a production process and formula of waterproof, oil-proof and anti-fouling high-grade environment-friendly PU synthetic leather.

Background technique

PU synthetic leather is a substitute material for leather. The production method is to dip polyurethane on fabric or non-woven fabric, and there are two methods of dry or wet coagulation to form a film. At present, due to the large molecular particles of the dense layer formed by the surface resin, the general PU synthetic leather is easy to stick to water, oil, dust and other pollutants, and cannot be removed directly. It needs to be washed in water with detergent to achieve the purpose of cleaning.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned shortcoming of prior art, provide a kind of high-grade synthetic leather of waterproof, oil-repellent, antifouling, make the synthetic leather surface that pollutes lightly wipe clean, reduce the impact of water on synthetic leather products. pollution of the environment. The principle is to produce a nano-scale protective layer on the surface of synthetic leather through special processing, forming a synthetic leather surface similar to the "lotus leaf effect".

In order to achieve the above object, the solution of the present invention is:

Environmentally friendly PU synthetic leather production process, the process includes:

The first stage: semi-finished base process:

1. Dissolve wet-process PU resin in DMF solvent to prepare PU mixture for substrate;

2. Use the PU mixture for the above base to impregnate and coat the non-woven fabric;

3. Put the above-mentioned dip-coated non-woven fabric into a liquid that has affinity with the solvent but not with the PU resin, and extract the solvent in the mixed liquid to form a wet film;

4. The product after film formation is washed with water to remove the residual DMF, and the semi-finished base is made after setting and drying. The speed of the machine is controlled at 8-12m/min.

The second stage: the technological process of semi-finished leather:

1. Dissolve the dry-process PU resin in DMF and MEK solvents to prepare the PU mixture for the skin layer;

2. Apply the mixed solution for the skin layer on the release paper at the amount of (110-140) g/m ² by scraping, dry it with hot air at 70-110°C, and cool it for 1-2 minutes to give the leather surface texture and color;

3. Then coat (120-170) g/m ² adhesive layer mixture on the epidermis, control the patch pressure at about 4-5kg/cm ² , and stick the semi-finished base;

4. Dry with hot air at 100-120°C for 1-2 minutes and then peel off the release paper. The product after peeling is semi-finished leather. The speed of the production line is controlled at 12-18m/min.

The third stage: post-processing process:

1. Mix nanoscale modified aliphatic PU resin with crosslinking agent to prepare nanoscale treatment agent.

2. Using the 100-mesh printing process, evenly roll-coat the prepared nano-scale treatment agent on the semi-finished PU synthetic leather, and properly slow down the speed and control it at 3-5m/min;

3. Use an oven temperature of 130-150°C to cure the synthetic leather to make environmentally friendly PU synthetic leather.

The formula of described environment-friendly PU synthetic leather production technological process is:

Wet recipe for the first stage:

Wet PU resin: 100

DMF: 20-30

Surfactant: 3-7

Color paste: 4-6

Consumption: 1400-1600g/y

The dry recipe for the second stage:

Dry PU resin: 100

DMF: 40-60

MEK: 40-60

Toner: 8-12

Consumption: 300-400g/y

The third stage post-processing formula:

Modified aliphatic PU resin: 100

Cross-linking agent: 20-30

Consumption: 80-120g/y

The optimal formula of described environment-friendly PU synthetic leather production technological process is:

Wet recipe for the first stage:

Wet PU resin: 100

DMF: 25

Surfactant: 5

Color paste: 5

Consumption: 1500g/y

The dry recipe for the second stage:

Dry PU resin: 100

DMF: 50

MEK: 50

Toner: 10

Consumption: 350/y

The third stage post-processing formula:

Modified aliphatic PU resin: 100

Cross-linking agent: 25

Consumption: 100g/y

Using the above process flow and formula, the invention produces a nano-scale protective layer on the surface of the synthetic leather through special process treatment, forming a surface similar to the "lotus leaf effect" of the synthetic leather. High-grade synthetic leather with waterproof, oil-proof, and anti-fouling functions can make the contaminated synthetic leather surface clean with a light wipe, reducing the pollution to the water environment when synthetic leather products are cleaned.

Description of drawings

Fig. 1 is a process flow chart of semi-finished base of the present invention;

Fig. 2 is the process flow chart of semi-finished leather of the present invention;

Fig. 3 is a flow chart of the post-treatment process of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Environmentally friendly PU synthetic leather production process, the process includes:

The first stage: semi-finished base process:

Dissolve the wet PU resin in DMF solvent, prepare the PU mixed solution for the semi-finished base, use the mixed solution to impregnate and coat the non-woven fabric, and then put it into the non-woven fabric that has affinity with the solvent but not with the PU resin. in liquid. The solvent in the mixed solution is extracted to form a wet film. Continuous air bubbles are generated during the solvent extraction process, resulting in a porous film, and the semi-finished base is obtained after washing to remove DMF in the film and drying.

The second stage: the technological process of semi-finished leather:

Dissolve the dry-process PU resin mixture in DMF and MEK, use a scraper to prepare the surface, and apply the PU mixture for the skin layer on the release paper at a dosage of (110-140) g/ ^m2 , and heat it with hot air at 70-110°C Dry and cool for 1 to 2 minutes to give texture and color to each surface. Then coat (120-170) g/m ² adhesive layer mixture on the epidermis, control the sticking pressure at about 4-5kg/cm ² , paste the semi-finished base, and dry it with hot air at 100-120°C After 2 minutes, release paper is peeled off, and the product after peeling is semi-finished leather. The production line speed is controlled at 12-18m/min.

The third stage: post-processing process:

Using the 100-mesh printing process, the prepared nano-scale treatment agent is evenly rolled onto the semi-finished PU synthetic leather, the production line speed is appropriately slowed down to 4m/min, and the synthetic leather is matured at the temperature of the oven to obtain "easy to clean" environmentally friendly PU synthetic leather. leather.

Wet formulation for the first stage of the above process:

Wet PU resin: 100

DMF: 20-30 (best 25)

Surfactants: 3-7 (best 5)

Color paste: 4-6 (best 5)

Consumption: 1400-1600g/y (best 1500)

The dry recipe for the second stage:

Dry PU resin: 100

DMF: 40-60 (best 50)

MEK: 40-60 (best 50)

Toner: 8-12 (best 10)

Consumption: 300-400g/y (best 350)

The third stage post-processing formula:

Modified aliphatic PU resin: 100

Cross-linking agent: 20-30 (best 25)

Consumption: 80-120g/y (best 100)

Using the above-mentioned technological process and formula, the invention produces a nano-scale protective layer on the surface of the synthetic leather through special technological treatment, forming a similar "lotus leaf effect". Its waterproof, oil-proof, and anti-fouling high-grade synthetic leather can make the contaminated synthetic leather surface clean with a light wipe, reducing the pollution to the water environment when synthetic leather products are cleaned.

Claims (3)

1. The production process of environmentally friendly PU synthetic leather, characterized in that: the process includes: The first stage: semi-finished base process: (1) Dissolve the wet-process PU resin in DMF solvent to prepare the PU mixture for the substrate; (2), using the PU mixture for the above-mentioned substrate by dipping and coating on the non-woven fabric; (3), put the above-mentioned dip-coated non-woven fabric into a liquid that has affinity with the solvent but not with the PU resin, and extracts the solvent in the mixed solution to form a wet film; (4) The product after film formation is washed with water to remove residual DMF, and the semi-finished base is obtained after finalizing and drying, and the speed of the production line is controlled at 8-12m/min. The second stage: the technological process of semi-finished leather: (1) Dissolve the dry-process PU resin in DMF and MEK solvents to prepare the PU mixture for the epidermis; (2) Apply the mixed solution for the skin layer on the release paper in an amount of (110-140) g/ ^m2 by scraping, dry with hot air at 70-110°C, cool for 1-2 minutes, and give the leather surface texture and color; (3) Then coat (120-170) g/m ² adhesive layer mixture on the epidermis, control the patch pressure at about 4-5kg/cm ² , and stick the semi-finished base; (4) Dry with hot air at 100-120°C for 1-2 minutes and then peel off the release paper. The product after peeling is semi-finished leather. The speed of the production line is controlled at 12-18min/m. The third stage: post-processing process: (1) Mix nanoscale modified aliphatic PU resin and crosslinking agent to prepare nanoscale treatment agent; (2) Using the 100-mesh printing process, evenly roll-coat the prepared nano-scale treatment agent on the semi-finished PU synthetic leather, and properly slow down the production line speed, and control it at 3-5m/min; (3) Using a high temperature of 130-150° C. to ripen the synthetic leather to make environmentally friendly PU synthetic leather. 2. The formula for the production process of environmentally friendly PU synthetic leather as claimed in claim 1, characterized in that: (1), the wet formula of the first stage: Wet PU resin: 100 DMF: 20-30 Surfactant: 3-7 Color paste: 4-6 Consumption: 1400-1600g/y (2), the dry formula of the second stage: Dry PU resin: 100 DMF: 40-60 MEK: 40-60 Toner: 8-12 Consumption: 300-400g/y (3), the third stage post-treatment formula: Modified aliphatic PU resin: 100 Cross-linking agent: 20-30 Consumption: 80-120g/y. 3. The recipe for the production process of environmentally friendly PU synthetic leather as claimed in claim 2, characterized in that: the ratio of the best recipe is: (1), the wet formula of the first stage: Wet PU resin: 100 DMF: 25 Surfactant: 5 Color paste: 5 Consumption: 1500g/y (2), the dry formula of the second stage: Dry PU resin: 100 DMF: 50 MEK: 50 Toner: 10 Consumption: 350/y (3), the third stage post-treatment formula: Modified aliphatic PU resin: 100 Cross-linking agent: 25 Consumption: 100g/y.

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