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Impregnation method of water-saving superfine fiber synthetic leather base cloth based on cationic waterborne polyurethane

A cationic polyurethane and water-based polyurethane technology, which is applied in the field of synthetic leather manufacturing, can solve the problems of difficult control of cell structure uniformity, easy cell rupture, and short foam life, and achieve good hydrolysis resistance, plump hand feeling, and reduced energy consumption. quantified effect

Active Publication Date: 2017-05-10
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN201110028118.1 reports "a kind of waterborne polyurethane superfine fiber synthetic leather and its preparation method". It is impregnated with microfiber base cloth, but the base cloth needs to be squeezed repeatedly during the impregnation process, and the cells are easy to break; in addition, when the viscosity is low, the life of the foam after foam stabilization is short, and when the viscosity is high, it is difficult to penetrate, and the cell structure is uniform Difficult to control, and the method needs to coagulate in water, still producing impregnated wastewater
The chemical foaming method is difficult to realize because there is no foaming agent suitable for the waterborne polyurethane system at present.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] First, mix 100 parts of water-based hydrolysis-resistant aromatic polyurethane emulsion with a solid content of 20% and a modulus of 30MPa, 5 parts of water-based color paste, 1.0 part of water-based penetrant, and 3 parts of water-based non-ionic polyurethane thickener. Water-based impregnation slurry with a viscosity of about 4000mPa·s; then impregnate the PA / COPET island-fixed superfine fiber non-woven fabric in the water-based impregnation slurry with an impregnation amount of 300 g / m 2 ; Then put the impregnated ultrafine fiber non-woven fabric directly into 10% sodium hydroxide aqueous solution for coagulation and alkali reduction treatment, the reduction temperature is 95 ° C, and the reduction time is 30 minutes; the base after alkali reduction Wash the cloth until it is neutral, and dry it at 100-130°C to obtain a superfine fiber synthetic leather base cloth. The microfiber synthetic leather base cloth is ground, dyed, and raised to produce suede microfiber syn...

Embodiment 2

[0033] First, mix 100 parts of water-based hydrolysis-resistant aromatic polyurethane emulsion with a solid content of 35% and a modulus of 40MPa, 7 parts of water-based color paste, 2.0 parts of water-based penetrant, and 2.0 parts of water-based non-ionic polyurethane thickener. Form a water-based impregnation slurry with a viscosity of 4500mPa·s; then impregnate the PA / PET island-fixed superfine fiber non-woven fabric in the water-based impregnation slurry with an impregnation amount of 450 / m 2 ; Then put the impregnated ultrafine fiber non-woven fabric directly into 15% sodium hydroxide aqueous solution for coagulation and alkali reduction treatment, the reduction temperature is 100 ° C, and the reduction time is 45 minutes; the base after alkali reduction Wash the cloth until it is neutral, and dry it at 100-130°C to obtain a superfine fiber synthetic leather base cloth. The superfine fiber synthetic leather base cloth is then ground and dry-laid to make superfine fiber s...

Embodiment 3

[0036] First, mix 100 parts of water-based hydrolysis-resistant aliphatic polyurethane emulsion with a solid content of 50% and a modulus of 50 MPa, 10 parts of water-based color paste, 5.0 parts of water-based penetrant, 50 parts of water, and 1.0 part of water-based cationic ionic polyurethane thickener. Uniform, made into a water-based impregnating slurry with a viscosity of 5000mPa·s; then impregnated the PA / PET island-fixed superfine fiber non-woven fabric in the water-based impregnating slurry, with an impregnation amount of 600 / m 2 ; Then put the impregnated superfine fiber non-woven fabric directly into 15% sodium hydroxide aqueous solution for coagulation and alkali reduction treatment, the reduction temperature is 100 ° C, and the reduction time is 60 minutes; the base after alkali reduction Wash the cloth until it is neutral, and dry it at 100-130°C to obtain a superfine fiber synthetic leather base cloth. The superfine fiber synthetic leather base cloth is then gro...

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Abstract

The invention discloses a water-saving superfine fiber synthetic leather base cloth impregnation method based on cationic water-based polyurethane. The impregnation method includes the steps that 100 parts of the water-based alkali-hydrolysis-resisting cationic polyurethane with the solid content ranging from 20% to 50%, 0 part to 50 parts of water, 5 parts to 10 parts of color paste and 1 part to 3 parts of thickening agents are evenly mixed, and water-based impregnation slurry is prepared; superfine fiber non-woven fabric is immersed into the water-based polyurethane slurry to be impregnated, and finally placed into a 10%-15% sodium hydroxide aqueous solution to be subjected to synchronous solidification and alkali-weight-reduction treatment, wherein the solidification and weight-reduction bath temperature ranges from 95 DEG C to 100 DEG C, the solidification and weight-reduction time ranges from 30 min to 60 min, under the alkali condition, the cationic polyurethane is solidified in superfine fiber synthetic leather and forms a foam structure, and a sea component PET is dissolved under the effect of hot alkali to achieve weight reduction; the base cloth obtained after alkali weight reduction is washed, dried and buffed, and finally superfine fiber synthetic leather is obtained through dry-method surface making and after-treatment. According to the impregnation method, the water-based polyurethane replaces solvent type resin to be used for impregnating the superfine fiber synthetic leather base cloth, and ecological environmental protection is achieved; the foam structure is formed through the characteristic that the cationic polyurethane is rapidly solidified when encountering alkali, and the foam feeling and the fullness of the finished leather are improved; the solidification and alkali-weight-reduction process is completed in one bath, and therefore water consumption, energy consumption and technologies are reduced.

Description

technical field [0001] The invention relates to a method for impregnating a water-saving superfine fiber synthetic leather base cloth based on cationic waterborne polyurethane, which belongs to the field of synthetic leather manufacture. Background technique [0002] As the latest generation of synthetic leather products, microfiber synthetic leather has excellent resilience, softness, imitation, and air permeability. It is replacing genuine leather and ordinary synthetic leather to meet the demand for high-end products in domestic and foreign markets. , reflecting the main direction of synthetic leather technology development. Microfiber can be divided into fixed-island fiber and indeterminate-island fiber. Correspondingly, the manufacturing process of superfine fiber synthetic leather is divided into indeterminate-island process and fixed-island process. The process flow is as follows: [0003] (i) Adventitious island process: adventitious island sea-island fiber → needle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06N3/14D06M15/564D06M101/34D06M101/32
Inventor 范浩军颜俊陈意刘若望张家发郭学方许平凡
Owner SICHUAN UNIV
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