Aqueous polyurethane dispersoid for coating yellowing-resistant leather and preparation method thereof

A water-based polyurethane and dispersion technology, applied in polyurea/polyurethane coatings, leather surface treatment, small raw leather/big raw leather/leather/fur treatment, etc., can solve problems that cannot be solved fundamentally, and achieve low energy consumption , The effect of the simple preparation method

Inactive Publication Date: 2013-02-13
山西省应用化学研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method can only delay the yellowing of the

Method used

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  • Aqueous polyurethane dispersoid for coating yellowing-resistant leather and preparation method thereof

Examples

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Effect test

Embodiment 1

[0026] Add 60g of PPG and 20g of PTMEG into a 500mL four-necked flask, heat and melt, and vacuumize at 120°C for 1.5h. After vacuum stop, add 1g TMP, cool down to 60°C, add 15g HMDI and 20g IPDI, react for 1.5h, then add 5g dimethylol propionic acid, react for 0.5h, add 2g 1,4-butanediol, react for 2h. Neutralize with 2.5 g of triethylamine for 30 minutes, add 10 g of acetone to reduce the viscosity of the material, add 260 g of deionized water, and remove the solvent acetone by vacuuming to obtain a water-based polyurethane dispersion for leather finishing.

Embodiment 2

[0028] Add 55g of PPG and 20g of PTMEG into a 500mL four-necked flask, heat and melt, and vacuumize at 120°C for 1.5h. After stopping the vacuum, add 4g of castor oil, cool down to 60°C, add 28g of HMDI and 7g of IPDI, react for 1.5h, then add 8g of dimethylol butyric acid, react for 1h, add 1g of diethylene glycol, react for 2.5h. Neutralize with 5g of triethylamine for 30 minutes, add 10g of acetone to reduce the viscosity of the material, add 270g of deionized water, and remove the solvent acetone by vacuuming to obtain a water-based polyurethane dispersion for leather finishing.

Embodiment 3

[0030] Add 50g of PPG, 20g of PTMEG and 5g of PPA into a 500mL four-necked flask, heat and melt, and vacuumize at 120°C for 1.5h. After stopping the vacuum, add 1.5g TMP, cool down to 50°C, add 13.5g HMDI and 23g IPDI, react for 1.5h, then add 7g dimethylol propionic acid, react for 0.5h, add 0.5g triethylene glycol, react 2h. Neutralize with 4.5 g of triethylamine for 30 minutes, add 10 g of acetone to reduce the viscosity of the material, add 250 g of deionized water, and vacuumize to remove the solvent acetone to obtain a water-based polyurethane dispersion for leather finishing.

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Abstract

The invention discloses an aqueous polyurethane dispersoid for coating yellowing-resistant leather. The aqueous polyurethane dispersoid is prepared through the following steps: performing reaction on polyalcohol, a diisocyanate mixture and a crosslinking agent to generate a prepolymer with -NCO terminal group, wherein the diisocyanate mixture consisting of dicyclohexylmethane diisocyanate and isophorone diisocyanate is taken as a starting material; adding a hydrophilic chain extender into the prepolymer, further reacting and extending the chain by micromolecular dihydric alcohol; and neutralizing by using triethylamine and dispersing into water to obtain the aqueous polyurethane dispersoid. According to the aqueous polyurethane dispersoid prepared by the method, the yellowing-resistant level can reach more than level 4, the tensile strength is more than or equal to 15 MPa, the elongation ratio is more than or equal to 800 percent and the tearing strength is more than or equal to 50 MPa. The coated leather has soft and natural luster and plump and moist handfeel.

Description

technical field [0001] The invention belongs to the technical field of polyurethane production, and relates to a water-based polyurethane dispersion for leather finishing and a preparation method thereof. The water-based polyurethane dispersion of the present invention is suitable for the surface and edge finishing of leather products such as clothing, belts, handbags and seats. Background technique [0002] With the development of the leather industry, leather products are more and more widely used in people's daily life. Finishing is an important process in the leather manufacturing process, which has a vital impact on the appearance, hygienic performance and physical and mechanical properties of leather products. Through the finishing operation, the beauty and durability of the leather can be increased, the grade of the product can be improved, the varieties of designs and colors can be increased and the scope of use can be expanded. Therefore, the requirement for the c...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/66C08G18/65C08G18/10C09D175/06C09D175/08C09D175/04C14C11/00
Inventor 张保玲董永兵侯彩英周艳明任效东原丽平马国章
Owner 山西省应用化学研究所
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