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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 low compression set value, reduce the rebound elasticity and compression set rate, improve mechanical strength, increase The effect of chemical crosslinking

Active Publication Date: 2020-11-03
上海博盛聚氨酯制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Preparation method of polyurethane elastomer with low resilience and low compression set
  • Preparation method of polyurethane elastomer with low resilience and low compression set
  • Preparation method of polyurethane elastomer with low resilience and low compression set

Examples

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Embodiment 1

[0038] A kind of preparation method of the polyurethane elastomer of low resilience, 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, raise the temperature to 120°C, dehydrate for 2 hours at a vacuum degree of -0.1MPa, and then cool down to 40°C , exposed to vacuum and added to toluene diisocyanate, the molar ratio of toluene diisocyanate to polyester diol is 1.5:1, the reaction is exothermic until the reaction system naturally heats up to 30 minutes, then slowly heated to 80 ° C, and kept for 3 hours to obtain prepolymer;

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

Embodiment 2

[0044] A method for preparing 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, raise the temperature to 140°C, dehydrate for 3h at a vacuum degree of -0.1MPa, and then cool down to 60°C , exposed to vacuum and added to toluene diisocyanate, the molar ratio of toluene diisocyanate to polyester diol is 1.5:1, the reaction is exothermic until the reaction system naturally heats up to 40 minutes, then slowly heated to 90 ° C, and kept for 2 hours to obtain prepolymer;

[0046] S2, mixing and stirring: the prepolymer, chain extender, crosslinking agent, catalyst, and colorant are mixed according to the weight ratio of 100:1.9:2.9:0.03:0.5 and stirred at 600rpm for 30min to obtain the mixture, wherein The joint agent is a mixture of trimethylolpropane and 1,4-butanedio...

Embodiment 3

[0050] A method for preparing 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, raise the temperature to 120°C, dehydrate for 2 hours at a vacuum degree of -0.1MPa, and then cool down to 40°C , exposed to vacuum and added to toluene diisocyanate, the molar ratio of toluene diisocyanate to polyester diol is 1.8:1, the reaction is exothermic until the reaction system naturally heats up to 30 minutes, then slowly heated to 80 ° C, and kept for 3 hours to obtain prepolymer;

[0052] S2, mixing and stirring: the prepolymer, chain extender, crosslinking agent, catalyst and coloring agent are mixed according to the weight ratio of 100:2.2:3.3:0.1:1 and stirred at 600rpm for 30min to obtain the mixture, wherein The joint agent is a mixture of trimethylolpropane and 1,4-b...

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Abstract

The invention discloses a preparation method of a polyurethane elastomer with low resilience and low compression set, and relates to the technical field of high polymer materials. The preparation method comprises the following steps: S1, prepolymer preparation: taking polyester polyol containing side methyl and having a number-average molecular weight of 800 to 1000 and toluene diisocynate as rawmaterials, and carrying out a cross-linking reaction to generate a prepolymer; S2, mixing and stirring: uniformly mixing and stirring the prepolymer, a chain extender, a cross-linking agent, a catalyst and a coloring agent to obtain a mixture; S3, casting molding: injecting the mixture into a mold, pre-curing and then demolding the mixture in an oven in order to obtain the semi-product; S4, after-vulcanization: continuously vulcanizing the semi-finished product for 20 h in an oven, so that the polyurethane elastomer with low resilience and low compression set is prepared. The polyurethane elastomer prepared through the method has the advantages of being low in resilience value and low in compression set value under the condition that the mechanical property loss is small.

Description

technical field [0001] This application relates to the technical field of polymer materials, more specifically, it relates to a preparation method of 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 and 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 should have low rebound values, so the corresponding compression set values ​​will usually be high (the elastic recovery of materials is poor), while high rebound values , 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 material...

Claims

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Application Information

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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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