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Synthetic method of polyurethane prepolymer, prepolymer and castable polyurethane elastomer

A technology of polyurethane prepolymer and synthesis method, applied in the field of cast polyurethane elastomer, can solve the problems of no obvious improvement effect, difficulty in balancing modulus, tear strength and permanent deformation at low temperature, etc.

Active Publication Date: 2019-05-31
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Changing the NCO content of the prepolymer, or adjusting the composition of the prepolymer or elastomer product is a common solution. These common solutions either have no obvious improvement effect, or it is difficult to balance the modulus, tear strength and permanent deformation with the material elasticity, Low temperature and other properties

Method used

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  • Synthetic method of polyurethane prepolymer, prepolymer and castable polyurethane elastomer
  • Synthetic method of polyurethane prepolymer, prepolymer and castable polyurethane elastomer
  • Synthetic method of polyurethane prepolymer, prepolymer and castable polyurethane elastomer

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preparation example Construction

[0026] The invention relates to a synthesis method of an isocyanate-terminated polyurethane prepolymer, the prepolymer and a casting polyurethane elastomer containing the same.

[0027] Prepolymer Synthesis

[0028] The processing of cast polyurethane elastomer (CPU) products is mainly formed by reacting toluene diisocyanate (TDI) or diphenylmethane diisocyanate (MDI) type prepolymers with amines or small molecule alcohols chain-extending cross-linking agents. . TDI-type prepolymers often use amine chain extension cross-linking agents, such as 3,3'-dichloro-4,4'-diaminodiphenylmethane (MOCA), 3,5-dimethylthiotoluenediamine ( DMTDA) and diethyltoluene diamine (DETDA) and other diamines; MDI type prepolymers often use small molecule alcohol chain extension crosslinking agents, such as ethylene glycol, 1,4-butanediol, propylene glycol, 1, 6-hexanediol, 1,4-cyclohexanediol, neopentyl glycol, hydroquinone bis(β-hydroxyethyl) ether (HQEE), hydrogenated bisphenol A, resorcinol dihy...

Embodiment 1

[0074] Preparation of Isocyanate-terminated Polyurethane Prepolymer

[0075] According to the prepolymer theoretical NCO value (8.0%), the R value of calculating the total formula system (MDI / P1) is 3.689, setting R1 as 2.162, calculating the feeding ratio of the first process according to R1, i.e. MDI: P1= 100:350.17 (mass ratio), adding phosphoric acid (concentration 85wt%) accounting for 12ppm of the first process reactant total amount, and stirring and reacting for 3 hours at 70-80°C, the measured NCO value was about 4.00%; according to the R value and For the feeding of MDI and P1 in the first process, calculate the feeding amount of MDI in the second process, and stir and react at 70-80°C for 0.5 hours, and the measured NCO value is about 8.0%; after vacuum degassing for 0.5h, nitrogen gas After cleaning, seal and set aside.

[0076] Casting polyurethane elastomer preparation

[0077] First, pre-treat the chain-extending cross-linking agent, heat and melt 1,4-butanedio...

Embodiment 2-4

[0079] Referring to Example 1, the preparation of isocyanate group-terminated polyurethane prepolymer was carried out, and the synthesis formula parameters are shown in Table 1.

[0080] The physical properties of cast polyurethane elastomer samples are shown in Table II.

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Abstract

The invention relates to a synthetic method of an isocyanate-terminated polyurethane prepolymer, a prepolymer and a castable polyurethane elastomer containing the prepolymer. The synthetic method comprises the steps of first, subjecting a polyhydroxy material and a first part of a polyisocyanate to mixing in a reactor, heating to allow to react under about theoretic NCO value to obtain a first liquid, wherein the total quantity of isocyanate groups in the first part of the polyisocyanate and the total quantity of hydroxy groups in the polyhydroxy material have a molar ratio R1; second, addinga second part of the polyisocyanate to the first liquid, mixing, heating to allow to react until about the theoretic NCO value so as to obtain a prepolymer, wherein the molar ratio of all isocyanate groups in the prepolymer to all hydroxy groups is R, and R and R1 need to meet a limited relationship.

Description

technical field [0001] The invention relates to a synthesis method of an isocyanate-terminated polyurethane prepolymer, the prepolymer and a casting polyurethane elastomer containing the same. Background technique [0002] Casting polyurethane elastomer (CPU) is prepared by reacting oligomer polyol, polyisocyanate and chain-extending cross-linking agent. According to the type of oligomer polyol, it is divided into polyoxypropylene ether type, polytetramethylene ether type, polyester type, polycaprolactone type; according to the type of polyisocyanate, it is divided into TDI (toluene diisocyanate) type , MDI (diphenylmethane diisocyanate) type and other isocyanate types; according to the type of chain extension crosslinking agent, it is divided into alcohol chain extension type, amine chain extension type, etc. [0003] The processing of CPU often adopts two-step method, also known as prepolymer method or prepolymer method; the first step is to react the oligomer polyol and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/32C08G18/42C08G18/12
Inventor 刘振东王凯高彦升
Owner WANHUA CHEM GRP CO LTD
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