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
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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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