CN105463867B - A kind of manufacture method of waterborne polyurethane synthetic leather - Google Patents

Abstract

A kind of manufacturing method of water-based polyurethane synthetic leather, adopts the mixed solution of calcium formate and calcium chloride to impregnate the base cloth, dry after rolling liquid, obtain the pre-treated base cloth; add foam coagulant, calcium formate and The pigments are mixed evenly to obtain water-based polyurethane slurry; the water-based polyurethane slurry is scraped and coated on the pretreated base cloth to obtain a water-based polyurethane synthetic leather base; the water-based polyurethane synthetic leather base is subjected to water-based surface treatment and vacuum absorption to obtain a water-based Polyurethane synthetic leather. The mixed solution of calcium formate and calcium chloride is used to impregnate the base fabric, which can prevent the slurry of the adhesive layer from infiltrating too much into the base fabric and affect the feel of the synthetic leather; the water-based surface treatment and the post-finishing process of vacuum absorption make the fabric Waterborne polyurethane synthetic leather has good hand feeling and mechanical properties. The invention adopts environment-friendly raw materials and a clean production process, and the content of any solvent in the obtained synthetic leather is less than 5ppm, which meets the requirements of ecological synthetic leather.

Description

A kind of manufacture method of waterborne polyurethane synthetic leather

technical field

The invention relates to the technical field of synthetic leather, in particular to a method for manufacturing water-based polyurethane synthetic leather.

Background technique

Synthetic leather is a composite material that simulates the structure and performance of natural leather and can be used as a substitute for natural leather. Usually, the non-woven fabric impregnated with high molecular polymer is used as the simulated mesh layer, and the microporous polyurethane layer is used to simulate the grain layer. The front and back of the obtained synthetic leather are very similar to leather, and have certain air permeability Artificial leather is closer to natural leather. Widely used in making shoes, boots, bags and ball games.

At present, as far as the development of synthetic leather technology is concerned, there are two main technical bottlenecks that hinder the rapid development of the synthetic leather industry: first, the environmental pollution caused by the solvent-based production system. The demand for solvent-based resins is more than 2 million tons, which means that about 1.5 million tons of toxic substances are volatilized and discharged into the air every year. Such a huge amount of waste gas emissions seriously pollutes the environment during the manufacturing process and is harmful to on-site operations. It poses a threat to the health of personnel, especially in the area around the synthetic leather factory. Second, due to the use of a solvent-based production system, there will be solvent residues in synthetic leather products, especially the residue of solvent dimethylformamide (DMF) will exceed the standard, which is difficult to meet the requirements of ecological synthetic leather.

Contents of the invention

In order to overcome the problems in the prior art, the object of the present invention is to provide a kind of manufacture method of waterborne polyurethane synthetic leather, this method adopts the raw material of environmental protection and clean production process, the obtained waterborne polyurethane synthetic leather has good mechanical property and Hand feeling characteristics, and the content of any solvent is less than 5ppm, which meets the requirements of ecological synthetic leather.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A kind of manufacture method of waterborne polyurethane synthetic leather, comprises the following steps:

(1) impregnating the base cloth with a mixed solution of calcium formate and calcium chloride, and drying after squeezing the liquid to obtain a pretreated base cloth;

(2) In parts by weight, add 7 to 10 parts of foaming coagulant, 5 to 10 parts of calcium carbonate and 1 to 2 parts of pigment to 100 parts of water-based polyurethane, and mix evenly to obtain water-based polyurethane slurry;

(3) scrape-coat the water-based polyurethane slurry on the pretreated base cloth, then dry to obtain the water-based polyurethane synthetic leather base;

(4) The water-based polyurethane synthetic leather base is subjected to water-based surface treatment and vacuum embossing to obtain the water-based polyurethane synthetic leather.

The pretreated base cloth in the step (1) is specifically prepared by the following method: in parts by weight, 1 to 2 parts of calcium formate and 1 to 2 parts of calcium chloride are dissolved in 80 to 100 parts of water Prepare the treatment solution, stir it evenly, put it into the dipping tank, the base cloth is impregnated with the treatment solution through the dipping tank, and then pass through the roll, the impregnation amount is 70% to 90% of the weight of the base cloth, and then it is baked under the condition of 100°C to 120°C Dry to obtain a pretreated base cloth.

The water-based polyurethane in the step (2) is water-based polyurethane with a solid content of 30-50%.

In the step (2), the foaming coagulant is prepared by the following method: in parts by weight, 2 to 5 parts of ammonium carbonate and 2 to 5 parts of ammonium nitrate are dissolved in 80 to 100 parts of water to obtain foam Foam coagulant.

The drying in the step (3) is carried out under the condition of 80°C to 120°C.

The scraping amount of the water-based polyurethane slurry in the step (3) is 230-480 g/m ² .

The water-based surface treatment in the step (4) is specifically as follows: evenly roll-coat the water-based surface treatment agent on the surface of the water-based polyurethane synthetic leather with a roll coating amount of 35-50 g/m ² Tumble dry.

The water-based surface treatment agent is prepared by the following method: in parts by weight, 30-50 parts of water-based polyurethane, 1-3 parts of nano-silicon dioxide, 1-3 parts of sodium alginate, and 50-100 parts of water are uniformly mixed , to obtain a water-based surface treatment agent.

The water-based polyurethane synthetic leather base after the water-based surface treatment is preheated at 150° C. to 180° C. for 1 to 2 minutes before the vacuum embossing.

Compared with the current technology, the present invention has the following beneficial effects: first, the base cloth is impregnated with calcium formate and calcium chloride mixed solution, which effectively prevents the water-based polyurethane slurry from penetrating into the base cloth; then, ammonium carbonate and ammonium nitrate It is a foaming coagulant, which will decompose and generate gas when heated, and make the water-based polyurethane slurry enter an acidic state, make the water-based polyurethane solidify, and form cells in the water-based polyurethane coating at the same time to obtain a water-based polyurethane synthetic leather base; finally use water-based polyurethane The surface treatment agent and the rubbing method are used to post-treat the waterborne polyurethane synthetic leather base to obtain the waterborne polyurethane synthetic leather. Since all environmentally friendly raw materials are used, environmentally friendly products can be obtained, and various chemical indicators of the products can reach the standards of ecological synthetic leather; the entire production process of the present invention does not generate waste gas and waste water, and is a clean and environmentally friendly production process; The present invention adopts the method for impregnating the base cloth with the mixed solution of calcium formate and calcium chloride, which can prevent the slurry of the adhesive layer from infiltrating into the base cloth too much and affect the feel of synthetic leather; the present invention uses ammonium carbonate and ammonium nitrate as the base cloth Foaming coagulant can be used to obtain foamed water-based polyurethane synthetic leather base; water-based surface treatment and vacuum absorbing post-finishing process can be used to obtain water-based polyurethane synthetic leather with good hand feeling and mechanical properties. The invention adopts environment-friendly raw materials and a clean production process, and the content of any solvent in the obtained synthetic leather is less than 5ppm, which meets the requirements of ecological synthetic leather.

detailed description

The present invention will be further described in detail through specific embodiments below, but the present invention is not limited to these examples.

The water-based polyurethane in the present invention is a water-based polyurethane with a high solid content, specifically a water-based polyurethane with a solid content of 30-50%, such as the water-based polyurethane dispersion of Wanhua Chemical Group Co., Ltd. But not limited to this kind of water-based polyurethane.

Example 1

A kind of manufacture method of waterborne polyurethane synthetic leather, comprises the following steps:

(1) In parts by weight, 1 part of calcium formate and 2 parts of calcium chloride are dissolved in 80 parts of water to make a treatment solution, stirred evenly and packed into a dipping tank, the base cloth is soaked in the treatment solution through the dipping tank, Then pass through rollers, the impregnation amount is 90% of the weight of the base cloth, and then dry in an oven at 100° C. to obtain a pretreated base cloth.

(2) In parts by weight, 5 parts of ammonium carbonate and 2.5 parts of ammonium nitrate were dissolved in 100 parts of water to obtain a foaming coagulant.

In parts by weight, 8 parts of foaming coagulant, 9 parts of calcium carbonate and 1 part of pigment are added to 100 parts of water-based polyurethane, and the mixture is evenly mixed to obtain water-based polyurethane slurry; wherein, water-based polyurethane is manufactured by Wanhua Chemical Group Co., Ltd. Waterborne Polyurethane Dispersion

(3) Scrape-coat the water-based polyurethane slurry on the pretreated base cloth, the amount of the water-based polyurethane slurry is 230g/ ^m2 , and then dry it in an oven at 90°C to obtain the water-based polyurethane synthetic leather bass;

(4) Using a three-plate printing machine, evenly roll-coat the water-based surface treatment agent on the surface of the water-based polyurethane synthetic leather with a roll coating amount of 50g/m ² , then dry it at 120°C, and then dry it at 170°C Preheat for 1 minute under the same conditions, then use a vacuum absorbing machine to vacuum absorb the grain, and wind it up after cooling to obtain water-based polyurethane synthetic leather. Wherein, the water-based surface treatment agent is prepared by the following method: in parts by weight, 30 parts of water-based polyurethane, 1 part of nano-silicon dioxide, 2 parts of sodium alginate, and 50 parts of water are uniformly mixed to obtain the water-based surface treatment agent.

Example 2

A kind of manufacture method of waterborne polyurethane synthetic leather, comprises the following steps:

(1) In parts by weight, 2 parts of calcium formate and 1 part of calcium chloride are dissolved in 90 parts of water to make a treatment solution, stirred evenly and packed into a dipping tank, the base cloth is soaked in the treatment solution through the dipping tank, Then pass through rollers, the impregnation amount is 80% of the weight of the base cloth, and then dry in an oven at 120° C. to obtain a pretreated base cloth.

(2) In parts by weight, 2 parts of ammonium carbonate and 3 parts of ammonium nitrate were dissolved with 85 parts of water to obtain a foaming coagulant.

In parts by weight, 9 parts of foam coagulant, 8 parts of calcium carbonate and 2 parts of pigment are added to 100 parts of water-based polyurethane, and mixed uniformly to obtain water-based polyurethane slurry; wherein, water-based polyurethane is a product of Wanhua Chemical Group Co., Ltd. Waterborne Polyurethane Dispersion

(3) Scrape-coat the water-based polyurethane slurry on the pretreated base cloth, the amount of the water-based polyurethane slurry is 300g/ ^m2 , and then dry it in an oven at 110°C to obtain the water-based polyurethane synthetic leather bass;

(4) Using a three-plate printing machine, evenly roll-coat the water-based surface treatment agent on the surface of the water-based polyurethane synthetic leather with a roll coating amount of 45g/m ² , then dry it at 80°C, and then dry it at 160°C Preheat for 2 minutes under the same conditions, and then use a vacuum absorbing machine to vacuum absorb the grain. After cooling, it is wound up to obtain water-based polyurethane synthetic leather. Wherein, the water-based surface treatment agent is prepared by the following method: in parts by weight, 40 parts of water-based polyurethane, 2 parts of nano silicon dioxide, 1 part of sodium alginate, and 70 parts of water are uniformly mixed to obtain the water-based surface treatment agent.

Example 3

A kind of manufacture method of waterborne polyurethane synthetic leather, comprises the following steps:

(1) In parts by weight, 2 parts of calcium formate and 1.5 parts of calcium chloride are dissolved in 100 parts of water to make a treatment solution, stirred evenly and packed into a dipping tank, the base cloth is soaked in the treatment solution through the dipping tank, Then pass through rollers, the impregnation amount is 70% of the weight of the base cloth, and then dry in an oven at 110° C. to obtain a pretreated base cloth.

(2) In parts by weight, 3 parts of ammonium carbonate and 2 parts of ammonium nitrate were dissolved in 80 parts of water to obtain a foaming coagulant.

In parts by weight, 10 parts of foaming coagulant, 6 parts of calcium carbonate and 1.5 parts of pigment are added to 100 parts of water-based polyurethane with a solid content of 30%, and mixed uniformly to obtain water-based polyurethane slurry.

(3) Scrape-coat the water-based polyurethane slurry on the pretreated base cloth, the amount of the water-based polyurethane slurry is 480g/ ^m2 , and then dry it in an oven at 80°C to obtain the water-based polyurethane synthetic leather bass;

(4) Use a three-plate printing machine to evenly roll-coat the water-based surface treatment agent on the surface of the water-based polyurethane synthetic leather base with a roll-coating amount of 50g/m ² , then dry it at 110°C, and then dry it at 150°C Preheat for 1.5 minutes under the same conditions, then use a vacuum absorbing machine to vacuum absorb the grain, and wind it up after cooling to obtain water-based polyurethane synthetic leather. Wherein, the water-based surface treatment agent is prepared by the following method: in parts by weight, 45 parts of water-based polyurethane, 3 parts of nano-silicon dioxide, 1.5 parts of sodium alginate, and 100 parts of water are uniformly mixed to obtain the water-based surface treatment agent.

Example 4

A kind of manufacture method of waterborne polyurethane synthetic leather, comprises the following steps:

(1) In parts by weight, 1.5 parts of calcium formate and 1 part of calcium chloride are dissolved in 85 parts of water to make a treatment solution, after being stirred evenly, the dipping tank is packed into, and the base cloth is impregnated with the treatment solution through the dipping tank. Then pass through rollers, the impregnation amount is 85% of the weight of the base cloth, and then dry in an oven at 115° C. to obtain a pretreated base cloth.

(2) In parts by weight, 4 parts of ammonium carbonate and 5 parts of ammonium nitrate were dissolved with 90 parts of water to obtain a foaming coagulant.

In parts by weight, 7 parts of foaming coagulant, 10 parts of calcium carbonate and 2 parts of pigment are added to 100 parts of water-based polyurethane with a solid content of 40%, and mixed uniformly to obtain water-based polyurethane slurry.

(3) Scrape-coat the water-based polyurethane slurry on the pretreated base cloth, the amount of the water-based polyurethane slurry is 400g/ ^m2 , and then dry it in an oven at 120°C to obtain the water-based polyurethane synthetic leather bass;

(4) Using a three-plate printing machine, evenly roll-coat the water-based surface treatment agent on the surface of the water-based polyurethane synthetic leather, with a roll coating amount of 35g/m ² , then dry it at 90°C, and then dry it at 180°C Preheat for 1 minute under the same conditions, then use a vacuum absorbing machine to vacuum absorb the grain, and wind it up after cooling to obtain water-based polyurethane synthetic leather. Wherein, the water-based surface treatment agent is prepared by the following method: in parts by weight, 35 parts of water-based polyurethane, 2.5 parts of nano silicon dioxide, 3 parts of sodium alginate, and 80 parts of water are uniformly mixed to obtain the water-based surface treatment agent.

Example 5

A kind of manufacture method of waterborne polyurethane synthetic leather, comprises the following steps:

(1) In parts by weight, 1 part of calcium formate and 2 parts of calcium chloride are dissolved in 95 parts of water to make a treatment solution, and after stirring evenly, the dipping tank is packed into, and the base cloth is impregnated with the treatment solution through the dipping tank. Then pass through rollers, the impregnation amount is 75% of the weight of the base cloth, and then dry under the condition of 105° C. in an oven to obtain a pretreated base cloth.

(2) In parts by weight, 3.5 parts of ammonium carbonate and 4 parts of ammonium nitrate were dissolved with 95 parts of water to obtain a foaming coagulant.

In parts by weight, 8.5 parts of foaming coagulant, 5 parts of calcium carbonate and 1 part of pigment are added to 100 parts of water-based polyurethane with a solid content of 50%, and mixed uniformly to obtain water-based polyurethane slurry.

(3) Scrape-coat the water-based polyurethane slurry on the pretreated base cloth, the amount of the water-based polyurethane slurry is 350g/ ^m2 , and then dry it in an oven at 115°C to obtain the water-based polyurethane synthetic leather bass;

(4) Using a three-plate printing machine, evenly roll-coat the water-based surface treatment agent on the surface of the water-based polyurethane synthetic leather, with a roll coating amount of 40g/m ² , then dry it at 100°C, and then dry it at 165°C Preheat for 2 minutes under the same conditions, and then use a vacuum absorbing machine to vacuum absorb the grain. After cooling, it is wound up to obtain water-based polyurethane synthetic leather. Wherein, the water-based surface treatment agent is prepared by the following method: in parts by weight, 50 parts of water-based polyurethane, 1.5 parts of nano-silicon dioxide, 2.5 parts of sodium alginate, and 90 parts of water are uniformly mixed to obtain the water-based surface treatment agent.

The present invention has the following advantages: first, all environmentally friendly raw materials are used to obtain environmentally friendly products, and the chemical indicators of the products can reach the standards of ecological synthetic leather; second, the entire production process will not produce waste gas and waste water, It is a clean and environmentally friendly production process; third, the method of impregnating the base fabric with a mixture of calcium formate and calcium chloride can prevent too much slurry of the adhesive layer from penetrating into the base fabric and affecting the feel of the synthetic leather; Fourth, using ammonium carbonate and ammonium nitrate as foaming coagulants, foamable water-based polyurethane synthetic leather can be obtained; fifth, using water-based surface treatment and post-finishing techniques for vacuum absorption, the obtained water-based polyurethane synthetic leather has Good feel and mechanical properties.

The invention adopts environment-friendly raw materials and a clean production process, and the content of any solvent in the obtained synthetic leather is less than 5ppm, which meets the requirements of ecological synthetic leather.

Claims (7)

1. a manufacture method of water-based polyurethane synthetic leather, is characterized in that, comprises the following steps: (1) impregnating the base cloth with a mixed solution of calcium formate and calcium chloride, and drying after squeezing the liquid to obtain a pretreated base cloth; (2) In parts by weight, add 7 to 10 parts of foaming coagulant, 5 to 10 parts of calcium carbonate and 1 to 2 parts of pigment to 100 parts of water-based polyurethane, and mix evenly to obtain water-based polyurethane slurry; (3) scrape-coat the water-based polyurethane slurry on the pretreated base cloth, then dry to obtain the water-based polyurethane synthetic leather base; (4) The water-based polyurethane synthetic leather base is subjected to water-based surface treatment and vacuum suction to obtain the water-based polyurethane synthetic leather; In terms of parts by weight, 1-2 parts of calcium formate and 1-2 parts of calcium chloride are dissolved in 80-100 parts of water to make a treatment solution, stirred evenly, then put into the dipping tank, and the base cloth is impregnated through the dipping tank The treatment solution is passed through rollers, the impregnation amount is 70% to 90% of the weight of the base cloth, and then dried at 100°C to 120°C to obtain a pretreated base cloth; In the step (2), the foaming coagulant is prepared by the following method: in parts by weight, 2 to 5 parts of ammonium carbonate and 2 to 5 parts of ammonium nitrate are dissolved in 80 to 100 parts of water to obtain foam Foam coagulant. 2. A method for producing water-based polyurethane synthetic leather according to claim 1, characterized in that: in the step (2), the water-based polyurethane is water-based polyurethane with a solid content of 30-50%. 3. A method for producing water-based polyurethane synthetic leather according to claim 1, characterized in that: the drying in the step (3) is carried out under the condition of 80°C to 120°C. 4 . The method for producing water-based polyurethane synthetic leather according to claim 1 , characterized in that: in the step (3), the scraping amount of the water-based polyurethane slurry is 230-480 g/m ² . 5. the manufacture method of a kind of water-based polyurethane synthetic leather according to claim 1 is characterized in that: the water-based surface treatment in the described step (4) is specifically as follows: the uniform roll coating of the water-based surface treatment agent on the water-based polyurethane synthetic leather On the bass surface, the amount of roller coating is 35~50g/m ² , and then dried at 80℃~120℃. 6. The manufacturing method of a kind of water-based polyurethane synthetic leather according to claim 5, characterized in that: the water-based surface treatment agent is obtained by the following method: in parts by weight, 30-50 parts of water-based polyurethane, nano 1-3 parts of silicon dioxide, 1-3 parts of sodium alginate and 50-100 parts of water are uniformly mixed to obtain a water-based surface treatment agent. 7. The manufacturing method of a kind of water-based polyurethane synthetic leather according to claim 1, characterized in that: the water-based polyurethane synthetic leather base after the water-based surface treatment is pre-treated under the condition of 150°C to 180°C before the vacuum absorption. Heat for 1-2 minutes.