High-peel strength and anti-hydrolysis wet polyurethane resin and preparation method thereof

A polyurethane resin and hydrolysis-resistant technology, which is applied in the field of thermoplastic polyurethane resin for synthetic leather and its preparation, can solve the problems of peel strength and hydrolysis resistance gap, etc., and achieve the effect of high peel strength, improved peel strength and enhanced compatibility

Active Publication Date: 2014-06-11
HEFEI ANLI POLYURETHANE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, many polyurethane resins appearing on the market still have certain gaps in peel strength, hydrolysis resistance, etc., so that the products produced have some defects.

Method used

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  • High-peel strength and anti-hydrolysis wet polyurethane resin and preparation method thereof
  • High-peel strength and anti-hydrolysis wet polyurethane resin and preparation method thereof
  • High-peel strength and anti-hydrolysis wet polyurethane resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] a. Add 10-20% of isocyanate, 80-90% of polyol compound and antioxidant into DMF and react at 75-85°C for 1-2h. The solid content of the reaction solution is controlled at 40-50%; -NCO / - The OH molar ratio is 0.8-0.9:1;

[0045] b. Add 5-15% polyol compound and 15-30% diol chain extender to the reaction solution, add 15-20% isocyanate to carry out prepolymerization reaction, and use organic bismuth catalyst 0.1-0.5kg React in the presence of 75-85 ℃ for 1-3 hours to obtain a prepolymer, add DMF during the reaction to adjust the solid content of the prepolymer to 45-60%, and control the viscosity to 30000-70000cps / 75℃;

[0046] c. Add the remaining amount of polyol compound, the remaining amount of diol chain extender and the remaining amount of isocyanate to the prepolymer, after stirring evenly, continue to react at 75-85°C for 2-5h, depending on the degree of reaction during the reaction Add DMF to the system for dilution in two to three steps to control the viscosity...

Embodiment 2

[0051] The preparation method of the present embodiment is the same as that of Example 1, and the raw materials and additions used in each step are as follows:

[0052]

Embodiment 3

[0054] The preparation method of the present embodiment is the same as that of Example 1, and the raw materials and additions used in each step are as follows:

[0055]

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Abstract

The invention discloses a high-peel strength and anti-hydrolysis wet polyurethane resin and a preparation method thereof. The resin is prepared from isocyanate, a polyatomic alcohol compound, dihydric alcohol chain extender, an organic tin or organic bismuth catalyst, a reaction terminating agent and the conventional aid. The stable and high peel strength is determined by a special synthesis process; according to the adopted preparation process, the characteristic that the soft and hard sections of polyurethane can be adjusted is fully applied; and by controlling the amount of the soft and hard sections and the adding time, the compatibility of the soft and hard sections is improved ingeniously, the microphase separation in the leather forming process of the resin is reduced, the thickness of a pore wall obtained after the leather is formed by a wet method can be improved, and the resin is high and stable in peel strength. The peel strength and the anti-hydrolysis physical property of the polyurethane resin are greatly improved, and a product is durable and high in level and has market competitiveness.

Description

1. Technical field [0001] The invention relates to a thermoplastic polyurethane resin for synthetic leather and a preparation method thereof, in particular to a high peel strength, hydrolysis-resistant wet polyurethane resin and a preparation method thereof. 2. Background technology [0002] The application of polyurethane resin in synthetic leather is mainly reflected in many fields such as clothing, bags, shoes, furniture, automobiles, etc. Although the development of polyurethane resin for leather has a history of several decades, it is still in its infancy in China. In recent years, the development speed has gradually accelerated. Faced with the gradual increase of market demand, higher requirements are put forward for technological development and updating. For example, for some fields that require high physical properties, such as footwear, etc., the requirements for physical properties such as peel strength and hydrolysis resistance are high, which requires polyureth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/42C08G18/32C08G18/12C08L75/06C08L75/08
Inventor 张彪武春余惠坚强吴兴保田海英刘永福
Owner HEFEI ANLI POLYURETHANE NEW MATERIAL
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