A kind of preparation method of polyurethane elastomer with low resilience and low compression set

A polyurethane elastomer and permanent deformation technology, which is applied in the field of polyurethane elastomer preparation, can solve the problems of low rebound value and compression set value, so as to reduce the rebound resilience and compression set rate, and change the rebound and compression Effect of permanent deformation and improvement of mechanical strength

Active Publication Date: 2022-04-08
上海博盛聚氨酯制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the deficiencies in the above-mentioned technologies, the purpose of this application is to provide a method for preparing a polyurethane elastomer with low resilience and low compression set, which has low rebound value, low compression set, and low loss of mechanical properties. Advantages of low compression set values

Method used

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  • A kind of preparation method of polyurethane elastomer with low resilience and low compression set
  • A kind of preparation method of polyurethane elastomer with low resilience and low compression set
  • A kind of preparation method of polyurethane elastomer with low resilience and low compression set

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Embodiment 1

[0038] A kind of preparation method of polyurethane elastomer with low resilience and low compression set, such as figure 1 As shown, the specific preparation steps are:

[0039] S1, prepolymer preparation: add polyester diol containing pendant methyl groups and a number average molecular weight of 1000 into the reaction kettle, heat up to 120°C, dehydrate for 2h under vacuum of -0.1MPa, and then cool down to 40°C , contact the vacuum and add it to toluene diisocyanate, the molar ratio of toluene diisocyanate and polyester diol is 1.5:1, the reaction is exothermic until the reaction system is naturally heated to 30min, then slowly heated to 80 ℃, and the reaction is kept for 3h to obtain prepolymer;

[0040] S2, mixing and stirring: the prepolymer, the chain extender, the crosslinking agent, the catalyst, and the colorant are mixed according to the weight ratio of 100:1.9:2.9:0.03:0.5 and stirred at 600 rpm for 30 minutes to obtain a mixture, wherein the cross-linked The joi...

Embodiment 2

[0044] A preparation method of a polyurethane elastomer with low resilience and low compression set, the specific preparation steps are:

[0045]S1, prepolymer preparation: add polyester diol containing pendant methyl groups and a number average molecular weight of 1000 into the reaction kettle, heat up to 140°C, dehydrate for 3h under a vacuum of -0.1MPa, and then cool down to 60°C , contact the vacuum and add it to toluene diisocyanate, the molar ratio of toluene diisocyanate and polyester diol is 1.5:1, the reaction exotherms until the reaction system naturally heats up to 40min, then slowly heat to 90 ℃, and keep the reaction for 2h to obtain prepolymer;

[0046] S2, mixing and stirring: the prepolymer, the chain extender, the crosslinking agent, the catalyst, and the colorant are mixed according to the weight ratio of 100:1.9:2.9:0.03:0.5 and stirred at 600 rpm for 30 minutes to obtain a mixture, wherein the cross-linked The joint agent is a mixture of trimethylolpropane...

Embodiment 3

[0050] A preparation method of a polyurethane elastomer with low resilience and low compression set, the specific preparation steps are:

[0051] S1, prepolymer preparation: add polyester diol containing pendant methyl groups and a number average molecular weight of 1000 into the reaction kettle, heat up to 120°C, dehydrate for 2h under vacuum of -0.1MPa, and then cool down to 40°C , contact the vacuum and add it to toluene diisocyanate, the molar ratio of toluene diisocyanate and polyester diol is 1.8:1, the reaction is exothermic until the reaction system is naturally heated to 30min, then slowly heated to 80 ℃, and the reaction is kept for 3h to obtain prepolymer;

[0052] S2, mixing and stirring: the prepolymer, the chain extender, the crosslinking agent, the catalyst, and the colorant are mixed according to the weight ratio of 100:2.2:3.3:0.1:1 and stirred at 600rpm for 30min to obtain a mixture, wherein the crosslinking The joint agent is a mixture of trimethylolpropane...

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Abstract

This application discloses a method for preparing a polyurethane elastomer with low resilience and low compression set, which relates to the technical field of polymer materials, and includes the following steps: S1, prepolymer preparation: prepare a polymer containing side methyl groups, number average molecular weight The polyester polyol of 800‑1000 and toluene diisocyanate are used as raw materials for crosslinking reaction to generate prepolymer; S2, mixing and stirring: mixing and stirring the prepolymer with chain extender, crosslinking agent, catalyst and colorant evenly, Obtain the mixture; S3, casting molding: inject the mixture into the mold, and demould after pre-curing in an oven to obtain a semi-finished product; S4, post-vulcanization: continue vulcanizing the semi-finished product in an oven for 20-24 hours to obtain a low springback 1. Polyurethane elastomer with low compression set. The polyurethane elastomer prepared by the present application has the advantages of low rebound value and low compression set value under the condition of less loss of mechanical properties.

Description

technical field [0001] The present application relates to the technical field of polymer materials, and more particularly, to a method for preparing a polyurethane elastomer with low resilience and low compression set. Background technique [0002] Polyurethane (TPU) is a new type of organic polymer synthetic material with excellent properties, which can replace rubber and soft polyvinyl chloride material PVC. TPU has excellent physical properties such as wear resistance, aging resistance and toughness. [0003] The biggest feature of polyurethane elastomers is good elasticity. Usually, polyurethane elastomers have a low rebound value, so the corresponding compression set value is usually higher (the elastic recovery of the material is poor), and the rebound value is high. , the compression set will be lower. In the face of some special fields or material use environments, such as polyurethane elastomers used as shock absorbing materials and vibration absorbing materials, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/32C08G18/10
CPCC08G18/6651C08G18/42C08G18/10C08G18/3206C08G18/3814
Inventor 何正清高晓明
Owner 上海博盛聚氨酯制品有限公司
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