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Method for producing aqueous polyurethane synthetic leather

A water-based polyurethane and manufacturing method technology, applied in the field of synthetic leather, can solve the problems of difficult to meet ecological synthetic leather, threat, solvent residue, etc., and achieve the effect of good hand feeling and mechanical properties

Active Publication Date: 2016-04-06
江西中望实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 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. 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, and it is difficult to meet the requirements of ecological synthetic leather

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of manufacture method of waterborne polyurethane synthetic leather, comprises the following steps:

[0024] (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.

[0025] (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.

[0026] 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 i...

Embodiment 2

[0030] A kind of manufacture method of waterborne polyurethane synthetic leather, comprises the following steps:

[0031] (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.

[0032] (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.

[0033] 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 ...

Embodiment 3

[0037] A kind of manufacture method of waterborne polyurethane synthetic leather, comprises the following steps:

[0038] (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.

[0039] (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.

[0040] 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.

[0041] (3) ...

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Abstract

A method for producing an aqueous polyurethane synthetic leather is as below: impregnating a fabric by using a mixed liquid of calcium formate and calcium chloride, drying the rolling liquid to obtain a pretreated fabric; adding a foam coagulant, calcium formate and pigment in the aqueous polyurethane, mixing evenly to obtain an aqueous polyurethane slurry; scraping the slurry on the pretreated aqueous polyurethane fabric to obtain an aqueous polyurethane synthetic leather base; and subjecting the aqueous polyurethane synthetic leather base to aqueous surface treatment and vacuum line suction to obtain the aqueous polyurethane synthetic leather. The method employs a mixed liquid of calcium formate and calcium chloride for impregnating treatment on the fabric, so as to prevent excessive bleeding of the slurry in the adhesive layer into the fabric and influence on the handle feel of the synthetic leather; the aqueous surface treatment and vacuum line suction post-finishing process endow the aqueous polyurethane synthetic leather with good handle feel and mechanical properties. The present invention uses environmentally friendly materials and clean production process; and the obtained synthetic leather has content of any solvent less than 5ppm, and meets the requirements of ecological synthetic leather.

Description

technical field [0001] The invention relates to the technical field of synthetic leather, in particular to a method for manufacturing water-based polyurethane synthetic leather. Background technique [0002] 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. [0003] 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 e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06N3/14D06M13/188D06M11/155D06C23/04
CPCD06C23/04D06M11/155D06M13/188D06N3/0063D06N3/0065D06N3/0088D06N3/145D06N2211/28
Inventor 马兴元段月秦苏丁博
Owner 江西中望实业有限公司
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