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Solvent-free polyurethane with self-repairing function and preparation method thereof

A polyurethane and self-healing technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as emissions, achieve high production efficiency, mild trigger conditions, and solve the effects of polluting the environment

Pending Publication Date: 2021-11-16
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the polyurethane synthesized by the present invention does not need to use a solvent, and also solves the problem of organic pollutant discharge in the production and use of solvent-based polyurethane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0072] (1) Preparation of Component A: According to parts by weight, mix 60-90 parts of polyol, 50-80 parts of di-selenide glycol, 30-60 parts of T-type chain extender, 0.1-1 part of catalyst and fluid 0.1~1 parts of the leveling agent are mixed and stirred to react to obtain a polymer containing terminal hydroxyl groups, that is, component A;

[0073] (2) Preparation of component B: According to parts by weight, mix and stir 100-250 parts of polyisocyanate and 30-100 parts of polyol under nitrogen atmosphere for 2-4 hours to obtain polyurethane prepolymer, which is the component B;

[0074] (3) Add the prepared component A and component B into the reaction kettle according to the weight ratio of 1:1~1.1, stir and mix, and then ripen at 105°C~125°C to obtain a solvent-free polyurethane with self-healing function.

Embodiment 1

[0075] Embodiment 1: A solvent-free polyurethane with self-healing function, the preparation steps are as follows:

[0076] First, prepare the double selenide compound and the T-type chain extender according to the above method.

[0077] Then, prepare each raw material according to the following ratio,

[0078] Component A raw materials: 85 parts of polypropylene glycol, 30 parts of T-type chain extender, 80 parts of diselenide glycol, 1 part of dibutyltin dilaurate, 101 parts of leveling agent BYK-UV3510;

[0079] Component B raw materials: 100 parts of isophorone diisocyanate, 75 parts of polypropylene glycol.

[0080] Then, using the above-mentioned method, 100 parts of isophorone diisocyanate and 75 parts of polypropylene glycol were mixed and stirred at a high speed for 10 minutes to obtain material B. 30 parts of T-type chain extender, 80 parts of diselenide, 1 part of dibutyltin dilaurate, and 1 part of leveling agent BYK-UV3510 were gradually added to 85 parts of pol...

Embodiment 2

[0082] Embodiment 2: A solvent-free polyurethane with self-healing function, the preparation steps are as follows:

[0083] First, prepare a double selenide glycol compound and a T-type chain extender according to the above method;

[0084] Then, prepare each raw material according to the following ratio,

[0085] Component A raw materials: 45 parts of polytetrahydrofuran ether diol, 40 parts of polyglycolide diol,

[0086] 40 parts of T-type chain extender, 60 parts of double selenium glycol, 1 part of dibutyltin dilaurate, 0.1 parts of leveling agent BYK-UV35100;

[0087] Component B raw materials: 78 parts of toluene diisocyanate, 40 parts of polytetrahydrofuran ether diol, 35 parts of polyglycolide diol;

[0088] Mix 78 parts of toluene diisocyanate with 40 parts of polytetrahydrofuran ether diol and 35 parts of polyglycolide diol, and stir at high speed for 10 minutes to prepare material B. Gradually add 40 parts of T-type chain extender, 60 parts of double selenium gl...

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Abstract

The invention relates to the technical field of high polymer material polyurethane, in particular to solvent-free polyurethane with a self-repairing function and a preparation method of the solvent-free polyurethane. The polyurethane is prepared from a component A and a component B according to the weight ratio of 1: (1-1.1) through a pouring method; the component A comprises the following raw material: polyhydric alcohol, double-selenium dihydric alcohol, a T-type chain extender, a catalyst and a flatting agent; and the component B comprises polyisocyanate and polyol. The polyurethane disclosed by the invention can be self-repaired at room temperature, and the synthesized polyurethane can be repeatedly used. The self-repairing polyurethane is synthesized by a solvent-free two-component method, does not release toxic and harmful gases, is healthy and environment-friendly, has excellent mechanical properties and high production efficiency, and solves the problems of environmental pollution and resource waste of solvent type polyurethane.

Description

technical field [0001] The invention relates to the technical field of polymer material polyurethane, in particular to a solvent-free self-repairing polyurethane and a preparation method thereof. Background technique [0002] Polyurethane resin is a general term for a class of polymer compounds with carbamate units on the main chain synthesized from isocyanate, polyol and small molecule chain extender. Polyurethane resin can be made into polyurethane plastic, polyurethane fiber, polyurethane rubber and elastomer, polyurethane coating, polyurethane adhesive and polyurethane synthetic leather. [0003] However, polyurethane resin usually involves two common problems during use. One is that the product is prone to microscopic cracks due to scratches and collisions during use, and the microscopic cracks develop into macroscopic cracks, which eventually lead to permanent damage to the material, which not only damages the appearance quality of the product, but also affects the se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/32C09D175/08
CPCC08G18/6666C08G18/66C08G18/4018C08G18/42C08G18/48C08G18/3897C08G18/3825C09D175/08
Inventor 黄志超戚栋明田千俊杨浩
Owner ZHEJIANG SCI-TECH UNIV
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