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Polymerized thylene carbonate urethane elastomer and its preparation method

A technology of polyethylene carbonate and polyurethane elastomer, which is applied in the preparation of polyurethane elastomer, the field of polyethylene carbonate polyurethane elastomer, and can solve the problems of poor physical properties of polyurethane elastomer, high cost of ring-opening polymerization, and carbonic acid Low content of ester groups, etc., to achieve good room temperature curing performance, good biocompatibility, and excellent hydrolysis resistance

Active Publication Date: 2008-12-17
JIANGSU ZHONGKE JINLONG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The polycarbonate polyols used above are mainly synthesized by phosgene interfacial polycondensation, melt transesterification or cyclic carbonate ring-opening method. The first two methods all use phosgene in the synthesis process, which is easy to cause environmental pollution. The cost of ring-opening polymerization is too high
Although the polyol used by Harris et al. is a copolymer prepared by carbon dioxide and ethylene oxide, the content of carbonate groups in it is relatively small, and it is also compared with the small molecule polyol before putting the polyol into the reaction. The transesterification reaction is carried out at high temperature, and the structure of the polycarbonate polyol is greatly changed, which not only increases the cost, but also the physical properties of the obtained polyurethane elastomer are not high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 100 parts of polyethylene carbonate diol (the number-average molecular mass is 1000, the hydroxyl functionality is 2, and the carbonate group content is 20% by mass fraction) in a 250mL three-necked bottle, and add 2 parts by mass fraction 36% to 38% concentrated hydrochloric acid, dehydrated and degassed at 90°C for 2 hours. Cool to 60°C, add 60 parts of carbodiimide-modified diphenylmethane diisocyanate (the NCO mass fraction is 29.7%), use a strong stirring device (stirrer speed 2000r / min), heat up to 75°C and react for 1h , Vacuum defoaming to obtain prepolymer.

[0020] 10.4 parts of 1,4-butanediol (chain extender) and 0.86 parts of trimethylolpropane (crosslinking agent) were mixed evenly, then added to the above prepolymer and stirred vigorously, and quickly poured into the mold after vacuum defoaming, at 80°C Curing and crosslinking for 4 hours at low temperature, and curing at 110°C for 6 hours.

[0021] Measure the physical properties of the product aft...

Embodiment 2

[0026] Take 100 parts of polyethylene carbonate diol (the number-average molecular mass is 5000, the hydroxyl functionality is 4, and the carbonate group content is 40% by mass fraction) in a 250mL three-necked bottle, and add 2 parts by mass fraction 36% to 38% concentrated hydrochloric acid, dehydrated and degassed at 90°C for 2 hours. Cool to 60°C, add 24 parts of carbodiimide-modified diphenylmethane diisocyanate (the NCO mass fraction is 29.7%), use a strong stirring device (stirrer speed 2000r / min), heat up to 70°C and react for 3h , Vacuum defoaming to obtain prepolymer.

[0027] Take 4.48 parts of dehydrated trimethylolpropane (crosslinking agent) and add it to the above prepolymer and stir vigorously. After vacuum defoaming, pour it into the mold quickly, cure and crosslink at 75°C for 2h, and mature at 120°C for 5h.

[0028] Measure the physical properties of the product after demoulding, the results are as follows:

[0029] Tensile strength: 7.62MPa; elongation at...

Embodiment 3

[0031] Get 100 parts of polyethylene carbonate diol (the number-average molecular mass is 2000, the hydroxyl functionality is 2, and the carbonate group content is 20% by mass fraction) in a 250mL three-necked bottle, and add 2 parts by mass Concentrated hydrochloric acid with an amount of 36% to 38%, dehydrated and degassed at 90°C for 2 hours. Cool to 60°C, add 30 parts of carbodiimide-modified diphenylmethane diisocyanate (NCO mass fraction 29.7%), use a strong stirring device (stirrer speed 2000r / min), heat up to 75°C for 3 hours, Vacuum defoaming to obtain prepolymer.

[0032] Take 5.6 parts of dehydrated 1,4-butanediol (chain extender) and add it to the above prepolymer and stir vigorously. After vacuum defoaming, quickly pour into the mold, cure and cross-link at 80°C for 2 hours, and mature at 100°C for 8 hours.

[0033] Measure the physical properties of the product after demoulding, the results are as follows:

[0034] Tensile strength: 6.07MPa; elongation at break...

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Abstract

The invention discloses a polyethylene carbonate polyurethane elastomer and making method, which produces polycarbonate polyhydric alcohol through carbon dioxide and oxirane with 20-60 percent diisocyanate, 0.05-2 percent polymerization inhibitor, 2.4-17 percent chain-extending agent and or cross linking agent and 0-0.4 percent catalyst. The method possesses better mechanic property, plasticity, anti-oxidizing property and water weakened-durability, which can be applied in the liner, screen, sealing ring and medical equipments.

Description

technical field [0001] The invention relates to an aliphatic polycarbonate polyurethane elastomer, in particular to a polyethylene carbonate polyurethane elastomer, and also to a preparation method of the polyurethane elastomer. Background technique [0002] The polycarbonate polyols used in the preparation of aliphatic polycarbonate polyurethane elastomers are polyhexylene carbonate diol, polybutylene carbonate diol, polycarbonate Propylene glycol, etc. For example, a class of polycarbonate polyurethane elastomers with excellent biological properties (Xie Xingyi, Liu Fang, Zhong Yinping, etc.. Journal of Biomedical Engineering, 1999, 16 (Supplement): 121-122), or synthesized some solvent-resistant aliphatic polycarbonate polyurethane elastomers (Harris R F, Joseph M D, avidson C D et al. JAppl Polym Sci, 1990, 41: 487-507), Or take polypropylene carbonate and toluene diisocyanate (TDI) as raw material to synthesize polypropylene carbonate polyurethane elastomer (Peng Han ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/08C08K5/18
Inventor 张敏徐守萍刘保华张松伟
Owner JIANGSU ZHONGKE JINLONG CHEM
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