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

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

Active Publication Date: 2013-01-16
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% isocyanate, 80-90% polyol compound and antioxidant to DMF and react at 75-85℃ for 1-2h, and the solid content of the reaction liquid is controlled at 40-50%; -NCO / - The molar ratio of OH is 0.8-0.9:1;

[0045] b. Add 5-15% of polyol compound and 15-30% of diol chain extender to the reaction solution, add 15-20% of isocyanate for prepolymerization, and add 0.1-0.5kg of organic bismuth catalyst Prepolymer is obtained by reacting at 75-85℃ for 1-3h in the presence of presence. DMF is added during the reaction to adjust the solid content of the prepolymer at 45-60% and the viscosity at 30,000-70000cps / 75℃;

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

Embodiment 2

[0051] The preparation method of this embodiment is the same as that of embodiment 1. The raw materials used in each step and the addition amount are as follows:

[0052]

Embodiment 3

[0054] The preparation method of this embodiment is the same as that of embodiment 1. The raw materials used in each step and the addition amount 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 wet polyurethane resin with high peel strength and hydrolysis resistance 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 in market demand, higher requirements are put forward for technological development and updating. For example, for certain fields with higher physical properties, such as footwear, the requirements for peel strength, hydrolysis resistance and other physical properties are higher, which requires polyurethane ...

Claims

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Application Information

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Patent Type & Authority Applications(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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