Formula and preparation process for low-temperature-resistant high-elasticity polyurethane used for sealing

A technology with low temperature resistance and high elasticity, which is applied in the field of polyurethane materials, can solve the problems of low temperature resistance and elasticity, poor elasticity, etc., and achieve the effect of expanding the use temperature range, stable performance, and expanding the temperature range

Inactive Publication Date: 2019-10-22
上海唯万密封科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The operating temperature of polyether type ordinary polyurethane material: -45~90°C, the elasticity is 55%; the operating temperature of polyether type high resilience polyurethane material is: -50~100°C, the elasticity is 73%; : -30~110℃, elasticity 40%; polycaprolactone type high resilience polyurethane material operating temperature: -35~120℃, elasticity 66%; the above 4 polyurethane materials either have poor elasticity, or cannot achieve good balance Excellent low temperature resistance and elasticity

Method used

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  • Formula and preparation process for low-temperature-resistant high-elasticity polyurethane used for sealing
  • Formula and preparation process for low-temperature-resistant high-elasticity polyurethane used for sealing
  • Formula and preparation process for low-temperature-resistant high-elasticity polyurethane used for sealing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A low-temperature-resistant high-elastic polyurethane formula for sealing, comprising the following raw materials in parts by weight:

[0050]

[0051] The relative molecular mass of the polytetrahydrofuran is 1400-2000; the relative molecular mass of the polycaprolactone polyol is 1800-2200.

[0052] Preferably, the low-temperature-resistant high-elastic polyurethane formula for sealing includes the following raw materials in parts by weight:

[0053]

[0054]

[0055] The present invention also provides a preparation process of the low-temperature-resistant high-elasticity polyurethane for sealing comprising the following steps:

[0056] A. Take by weight: p-phenylene diisocyanate, polytetrahydrofuran, polycaprolactone polyol, hydroquinone dihydroxyethyl ether, 1,4-butanediol, antioxidant and filler;

[0057] B. Add polytetrahydrofuran and polycaprolactone polyol into the reaction kettle, stir at a medium speed of 500-800rpm, and control the temperature in t...

Embodiment 2

[0070] A low-temperature-resistant high-elastic polyurethane formula for sealing, comprising the following raw materials in parts by weight:

[0071]

[0072] The relative molecular mass of the polytetrahydrofuran is 1400; the relative molecular mass of the polycaprolactone polyol is 1800.

[0073] In this embodiment, the preparation process of the low-temperature-resistant high-elastic polyurethane for sealing includes the following steps:

[0074] A. Take by weight: p-phenylene diisocyanate, polytetrahydrofuran, polycaprolactone polyol, hydroquinone dihydroxyethyl ether, 1,4-butanediol, antioxidant and filler;

[0075] B. Add polytetrahydrofuran and polycaprolactone polyol into the reaction kettle, stir at a medium speed of 500rpm, and control the temperature in the reaction kettle at 102°C;

[0076] C, add antioxidant and filler again, adopt 2100rpm high-speed stirring and vacuumize, the temperature in the described reactor is controlled at 110 ℃;

[0077] D. After 1 h...

Embodiment 3

[0086] A low-temperature-resistant high-elastic polyurethane formula for sealing, comprising the following raw materials in parts by weight:

[0087]

[0088] The relative molecular mass of the polytetrahydrofuran is 2000; the relative molecular mass of the polycaprolactone polyol is 2200.

[0089] In this embodiment, the preparation process of the low-temperature-resistant high-elastic polyurethane for sealing includes the following steps:

[0090] A. Take by weight: p-phenylene diisocyanate, polytetrahydrofuran, polycaprolactone polyol, hydroquinone dihydroxyethyl ether, 1,4-butanediol, antioxidant and filler;

[0091] B. Add polytetrahydrofuran and polycaprolactone polyol into the reaction kettle, stir at a medium speed of 800rpm, and control the temperature in the reaction kettle at 98°C;

[0092] C, add antioxidant and filler again, adopt 2200rpm high-speed stirring and vacuumize, the temperature in the described reactor is controlled at 100 ℃;

[0093] D. After 2 ho...

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Abstract

The invention discloses a formula for low-temperature-resistant high-elasticity polyurethane used for sealing. The formula comprises the following raw materials by weight: 10-25 parts of p-phenylene diisocyanate, 20-40 parts of polytetrahydrofuran, 20-40 parts of polycaprolactone polyol, 4-8 parts of hydroquinone bis(2-hydroxyethyl)ether, 10-20 parts of 1,4-butanediol, 1-3 parts of an antioxidantand 2-4 parts of a filler, wherein the relative molecular mass of the polytetrahydrofuran is 1400-2000, and the relative molecular mass of the polycaprolactone polyol is 1800-2200. Theow-temperature-resistant high-elasticity polyurethane used for sealing prepared by the invention has good low-temperature resistance and high elasticity, is expanded in the range of use temperature and not liable tothermal ageing, and can be injection-molded.

Description

technical field [0001] The invention relates to the field of polyurethane materials, in particular to a low-temperature-resistant high-elasticity polyurethane formula for sealing and a preparation process. Background technique [0002] Polyurethane is a polymer containing carbamate groups in the main chain of macromolecules, called polyurethane. The polyester type is a polyurethane prepared from diisocyanate and hydroxyl-terminated polyester. Polyether polyurethane is a polyurethane prepared from diisocyanate and hydroxyl-terminated polyether. According to the isocyanate, it is divided into diphenylmethane diisocyanate (MDI), p-phenylene diisocyanate (PPDI), dimethyl diphenyl diisocyanate (TODI) and so on. The MDI system has strong availability of raw materials, mature production and processing, and its products are widely used around the world. The TODI system is limited by raw materials and formulations, and only a few countries use this system as polyurethane elastomer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/32C08G18/12
CPCC08G18/12C08G18/3206C08G18/4277C08G18/4854C08G18/6607C08G18/3215
Inventor 仲建雨
Owner 上海唯万密封科技股份有限公司
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