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MDI prepolymer, preparation method thereof and synthetic method for two-component polyurethane elastomer

A synthesis method and prepolymer technology, applied in the field of chemical products, can solve the problems of slow curing molding speed, detachment of epidermis matrix, peeling, etc., and achieve the effects of improving pass rate and production efficiency, increasing molding speed, and reducing shrinkage

Inactive Publication Date: 2018-07-03
中聚(福建)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in production practice, we found that polyurethane soles are prone to problems such as shrinkage, peeling, and slow curing and molding, which greatly affect the product qualification rate and production efficiency.
The reason is that the molding speed of the sole product in the curing molding stage is slow, which leads to the slow molding speed of the skin of the sole product, and the skin is easy to separate from the matrix.

Method used

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  • MDI prepolymer, preparation method thereof and synthetic method for two-component polyurethane elastomer
  • MDI prepolymer, preparation method thereof and synthetic method for two-component polyurethane elastomer
  • MDI prepolymer, preparation method thereof and synthetic method for two-component polyurethane elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Preparation of MDI prepolymer

[0037] (1) 100 parts by weight of pure MDI, 1 part by weight of liquefied MDI and 0.002 part by weight of phosphoric acid are added in the reactor simultaneously to mix and stir, and the temperature in the control reactor is 60-70 ℃;

[0038] (2) 5 parts by weight of polyester polyol and 5 parts by weight of polyether polyol are added to the reactor, and the temperature in the control reactor is 70-80 ° C, and reacted for 1-3 hours;

[0039] (3) adding 1 weight part of small molecular polyol, 1 weight part of terephthalic acid two (1,2-propylene glycol) ester in the reactor, the temperature in the control reactor is 60-70 ℃, reacted 1-3 hours , MDI prepolymers were obtained.

[0040] 2. Preparation of component A

[0041] Physically mix 100 parts by weight of polyester polyol, 0.1 part by weight of foaming agent, 0.1 part by weight of foam stabilizer, 1 part by weight of chain extender, and 0.5 part by weight of catalyst.

[0042] 3...

Embodiment 2

[0045] 1. Preparation of MDI prepolymer

[0046] (1) 100 parts by weight of pure MDI, 50 parts by weight of liquefied MDI and 0.008 parts by weight of phosphoric acid are added in the reactor simultaneously to mix and stir, and the temperature in the control reactor is 60-70 ℃;

[0047] (2) 100 parts by weight of polyester polyols and 100 parts by weight of polyether polyols are added to the reactor, and the temperature in the control reactor is 70-80 ° C, and reacted for 1-3 hours;

[0048] (3) 5 parts by weight of small molecular polyols, 10 parts by weight of two (1,2-propylene glycol) terephthalate are added in the reactor, the temperature in the control reactor is 60-70 ° C, and the reaction is 1-3 hours , MDI prepolymers were obtained.

[0049] 2. Preparation of component A

[0050] Physically mix 100 parts by weight of polyester polyol, 5 parts by weight of foaming agent, 2 parts by weight of foam stabilizer, 20 parts by weight of chain extender, and 3 parts by weight...

Embodiment 3

[0054] 1. Preparation of MDI prepolymer

[0055] (1) 100 parts by weight of pure MDI, 25 parts by weight of liquefied MDI and 0.005 parts by weight of phosphoric acid are added in the reactor simultaneously to mix and stir, and the temperature in the control reactor is 60-70 ℃;

[0056] (2) 30 parts by weight of polyester polyol and 30 parts by weight of polyether polyol are added to the reaction kettle, and the temperature in the control reaction kettle is 70-80 ° C, and reacted for 1-3 hours;

[0057] (3) 3 parts by weight of small molecular polyols, 5 parts by weight of two (1,2-propylene glycol) terephthalate are added in the reactor, the temperature in the control reactor is 60-70 ° C, and the reaction is 1-3 hours , MDI prepolymers were obtained.

[0058] 2. Preparation of component A

[0059] Physically mix 100 parts by weight of polyester polyol, 3 parts by weight of foaming agent, 1 part by weight of foam stabilizer, 10 parts by weight of chain extender, and 2 parts b...

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Abstract

The invention relates to an MDI (diphenyl methane diisocyanate) prepolymer, a preparation method thereof and a synthetic method for a two-component polyurethane elastomer. The two-component polyurethane elastomer is prepared by the following steps: performing mixing on pure MDI, liquefied MDI, a small-molecule polyol, di(1,2-propanediol) terephthalate, a polyester polyol, a polyether polyol and phosphoric acid, performing a reaction, wherein the reaction temperature is 60-80 DEG C, and the reaction time is 2-6h, so as to obtain the MDI prepolymer; mixing a polyester polyol, a foaming agent, afoam stabilizer, a chain extender and a catalyst to be used as a component A; and mixing the MDI prepolymer and the component A according to a certain weight ratio, injecting the mixed material into amold, performing a reaction for forming, wherein the mold temperature is 40-60 DEG C, and the forming time is 2-10min, and performing demoulding, so as to obtain the polyurethane elastomer. The method provided by the invention accelerates the forming speed of a material in the forming process, thereby avoiding the phenomenon of shrinkage or peeling of a finished product.

Description

technical field [0001] The invention relates to an MDI prepolymer, a preparation method thereof, and a synthesis method of a two-component polyurethane elastomer, belonging to the technical field of chemical products. Background technique [0002] Polyurethane is a general term for macromolecular compounds containing repeating urethane groups on the main chain. It is a polymer compound obtained by the interaction of dibasic or polyvalent organic isocyanates and polyol compounds. Polyurethanes can be generally divided into rigid polyurethane foams, flexible polyurethane foams, polyurethane elastomers and polyurethane coatings according to their physical properties and uses. Polyurethane is widely used in construction, automobile, light industry, textile, petrochemical and many other fields because of its excellent performance. It is an emerging organic polymer material and is known as the "fifth largest plastic". Especially in the field of shoemaking, polyurethane soles have...

Claims

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Application Information

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IPC IPC(8): C08G18/42C08G18/48C08G18/66C08G18/76C08G18/12C08G18/32C08J9/14
CPCC08G18/12C08G18/3206C08G18/3215C08G18/4018C08G18/4238C08G18/48C08G18/6607C08G18/7671C08J9/144C08J2203/142C08J2375/08C08G18/664
Inventor 李慧廖加健陈金焰杨林玲许俊杰刘士兵
Owner 中聚(福建)新材料有限公司
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