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Thermal aging-resistant polyurethane elastomer and preparation method thereof

A technology of polyurethane elastomer and heat-resistant aging, which is applied in the field of polyurethane elastomer and its preparation and heat-resistant aging polyurethane elastomer, which can solve the problems that the heat-resistant aging performance of polyurethane materials is not obviously improved and the application range is limited, and achieve heat resistance The aging performance is obvious, the preparation process is simple, and the effect of heat aging resistance improvement

Inactive Publication Date: 2013-11-20
HUBEI CHENGYU XINNUO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above methods improve the heat resistance of the material by changing the raw material composition and adding fillers, but the heat aging resistance of polyurethane materials is not significantly improved, and the application range is very limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The heat aging resistant polyurethane elastomer provided in the present embodiment, its preparation steps are as follows:

[0019] Add 51~57wt% polymer diol to the reactor, dehydrate at 80~100℃ for 1~3h; then add 20~25wt% diisocyanate and 3~4wt% catalyst, stir at 50~70℃ for 1~ 3h, the polyurethane prepolymer was prepared; the polyurethane prepolymer was mixed with 12~17wt% chain extension crosslinking agent and 1~3wt% auxiliary agent, poured, demoulded, and finally vulcanized at 60~85°C for 10~ 20h, the polyurethane elastomer was prepared.

[0020] In this embodiment: the diisocyanate is toluene-2,4-diisocyanate; the catalyst is triethylenediamine; the polymer diol is polytetrahydrofuran ether diol with a molecular weight of 1000-2000; the chain-extending cross-linking agent is 3, 3'-Dichloro-4,4'-diaminodiphenylmethane.

[0021] The polyurethane elastomer prepared in this example was tested by aging at 150°C for 3 days: the tensile strength before aging was 37.8~38.7...

Embodiment 2

[0023] The heat-aging-resistant polyurethane elastomer provided in this example has the same preparation steps as Example 1 except for the following raw materials:

[0024] In this embodiment: the diisocyanate is toluene-2,4-diisocyanate; the catalyst is triethylenediamine; the polymer diol is polytetrahydrofuran ether diol with a molecular weight of 2000~3000; the chain-extending crosslinking agent is 3, Mixture of 3'-dichloro-4,4'-diaminodiphenylmethane and 3,5-dimethylthiotoluenediamine.

[0025] The polyurethane elastomer prepared in this example was tested by aging at 150°C for 3 days: the tensile strength before aging was 48.9~52.1MPa, the elongation at break was 528~586%, the tensile strength after aging was 47.9~51.8MPa, and the elongation at break was 47.9~51.8MPa. The growth rate is 545~591%.

Embodiment 3

[0027] The heat-aging-resistant polyurethane elastomer provided in this example has the same preparation steps as Example 1 except for the following raw materials:

[0028] In this embodiment: the diisocyanate is a mixture of toluene-2,4-diisocyanate and 4,4'-diphenylmethane diisocyanate; the catalyst is triethylene diamine; the polymer diol is polytetrahydrofuran ether diol, The molecular weight is 3000~4000; the chain-extending cross-linking agent is a mixture of 3,3'-dichloro-4,4'-diaminodiphenylmethane and 1,4-butanediol.

[0029] The polyurethane elastomer prepared in this example was tested by aging at 150°C for 3 days: the tensile strength before aging was 39.5~40.7MPa, the elongation at break was 565~622%, the tensile strength after aging was 37.8~38.7MPa, and the elongation at break was 37.8~38.7MPa. The growth rate is 575~628%.

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Abstract

The invention provides a thermal aging-resistant polyurethane elastomer. The polyurethane elastomer is formed by mixing a polyurethane prepolymer, a chain extension cross-linking agent and auxiliaries, pouring, demolding and vulcanizing, wherein the polyurethane prepolymer is formed by stirring polymer diol, diisocyanate and a catalyst at the temperature of 50-100 DEG C, and the raw materials respectively comprise the following components in percentage by weight: 47-60wt% of polymer diol, 15-30wt% of diisocyanate, 0-4wt% of catalyst, 8-17wt% of chain extension cross-linking agent and 1-6wt% of auxiliaries. The invention simultaneously provides a preparation method of the thermal aging-resistant polyurethane elastomer. The method has the advantages of simple process and low equipment cost, and the produced polyurethane elastomer has excellent thermal aging resistance.

Description

technical field [0001] The invention provides a polyurethane elastomer and a preparation method thereof, in particular to a heat-resistant aging polyurethane elastomer, which belongs to the technical field of polymer materials. technical background [0002] Polyurethane has a hard and soft block structure, which shows many excellent low temperature resistance, wear resistance and wide hardness range, so it is widely used. However, due to the high temperature caused by the contact with air and internal heat generated during the use of its products, it may cause thermal oxidation and decomposition, which will cause the loss of material properties and affect the use. According to its characteristics, there are many modification methods, such as adjusting its molecular structure, adding antioxidants or inorganic fillers, etc. [0003] "A preparation method of rigid polyurethane" patent technology (CN 201110330929), discloses that the heat resistance of rigid polyurethane produc...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/75C08G18/73C08G18/66C08G18/48C08G18/32C08G18/10C08K5/12C08K5/06
Inventor 陈红祥卢运胜熊肖李威
Owner HUBEI CHENGYU XINNUO TECH
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