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Synthetic method of thermocuring polyurethane elastomer composite material for sealing materials

A technology of polyurethane elastomer and sealing material, which is applied in the synthesis field of heat-curing polyurethane elastomer composite material, can solve the problems of few patents and research reports, high viscosity of prepolymer, difficult processing, etc., and achieves good thermal stability and compression. The effect of small permanent deformation and wide adjustment range

Inactive Publication Date: 2016-04-06
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polarity of the carbonate group in polycarbonate diol is very strong, resulting in a high viscosity in the molten state, which brings a lot of inconvenience to the processing operation, and its application is greatly limited
In addition, when MDI and PCDL are used as raw materials to prepare polyurethane elastomers by the prepolymer method, the viscosity of the synthesized prepolymers is high, and processing is difficult, which also leads to few patents and research reports on the preparation of sealing materials for this raw material system.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. Synthesis of prepolymer (B1)

[0042] In a machine equipped with mechanical stirring, thermometer and N 2 Add 200g of polycarbonate diol (PCDL-6002, molecular weight 2000) and 3g of TMP that have been dehydrated in advance and preheated to 60°C into a three-necked flask with an inlet and outlet volume of 500ml, stir well, add 165g of molten MDI, and The reaction was incubated at 90°C for 2 hours. Sampling and analysis showed that the NCO base content was 11.85%, and the viscosity at 80°C was 1460mPaS, and then cooled and sealed for storage until use.

[0043] 2. Preparation of chain extender (A1)

[0044] In a machine equipped with mechanical stirring, thermometer and N 2 Add 200g of pre-dehydrated PCDL-6002 and 72.8g of pre-dehydrated 1,4-butanediol (BDO), 0.0055gT- 12 Catalyst, 20g of butyl benzyl phthalate, 10g of propylene carbonate and 0.05g of UV-9, stirred for 30min, the viscosity at 80°C was measured as 2080mPaS, sealed and stored until use.

[0045] 3. ...

Embodiment 2

[0049] 1. Synthesis of prepolymer (B2)

[0050] In a machine equipped with mechanical stirring, thermometer and N 2 Add 200g of PCDL-6002 and 3g of TMP that have been dehydrated in advance and preheated to 60°C into a three-necked flask with an inlet and outlet volume of 500ml, stir evenly, add 284.3g of molten MDI, and keep it at 90°C for 2 hours. Sampling analysis showed that the NCO base content was 15.2%, and the viscosity at 80°C was 970mPaS, and then cooled and sealed for storage until use.

[0051] 2. Preparation of chain extender (A2)

[0052] In a machine equipped with mechanical stirring, thermometer and N 2 Add 200g of PCDL-6002 that has been pre-dehydrated and preheated to 80°C, 57.1g of pre-dehydrated BDO, 0.0077g of T-12 catalyst, and 20g of butyl phthalate into a three-necked flask with an inlet and outlet volume of 500ml Benzyl benzyl ester, 15g propylene carbonate and 0.05g UV-9 were stirred for 30min, and the viscosity at 80°C was measured to be 2150mPaS, ...

Embodiment 3

[0057] 1. Synthesis of prepolymer (B3)

[0058] In a machine equipped with mechanical stirring, thermometer and N 2 Add 150g of PCDL-6002 and 2.25g of TMP that have been dehydrated in advance and preheated to 60°C into a three-necked flask with an inlet and outlet volume of 500ml. After stirring evenly, add 279.4g of molten MDI, and keep it at 90°C for 2 hours. Sampling and analysis showed that the NCO base content was 17.83%, and the viscosity at 80°C was 560mPaS, and then cooled and sealed for storage until use.

[0059] 2. Preparation of chain extender (A3)

[0060] In a machine equipped with mechanical stirring, thermometer and N 2 Add 200g of PCDL-6002 that has been dehydrated in advance and preheated to 80°C, 46.5g of BDO that has been dehydrated in advance, 0.0123g of T-12 catalyst, and 20g of butyl phthalate into a three-necked flask with an inlet and outlet volume of 500ml Benzyl benzyl ester, 20g propylene carbonate and 0.05g UV-9 were stirred for 30min, and the v...

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Abstract

The invention discloses a synthetic method of a thermocuring polyurethane elastomer composite material for sealing materials. The synthetic method comprises the following steps of reacting predehydrated polyhydric alcohols with diisocyanate to synthesize an isocyanate-terminated quasi-prepolymer; uniformly mixing the predehydrated polyhydric alcohols, a small molecule chain extender, a catalyst and an assistant to prepare a chain extender; uniformly mixing the isocyanate-terminated quasi-prepolymer and the chain extender according to a metering ratio, and performing casting, mold pressing thermal curing forming and vulcanization. The thermocuring polyurethane elastomer composite material disclosed by the invention has the advantages of good mechanical property, small compression permanent deformation, as well as good rebound resilience, wear resistance and processing property.

Description

technical field [0001] The invention belongs to a method for synthesizing heat-cured polyurethane elastomer composite material used for sealing materials. Background technique [0002] As the basic equipment of equipment manufacturing industry, hydraulic and pneumatic transmission devices are widely used in mining industry, petrochemical industry, machinery manufacturing, engineering machinery and other fields. The seals used are the key to preventing leakage of liquid media, maintaining system pressure, maintaining energy transfer or conversion, and are essential to ensure the normal operation of the system. The seal material should not only have high strength, low compression set, high wear resistance and suitable elasticity, but also have high hydrolysis resistance, oil resistance and thermal stability (Meng Kai et al., Coal Mine Modern Chemical Industry, 33(5) , 1999). [0003] Nitrile rubber was mainly used as the sealing material in the early days. With the developme...

Claims

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Application Information

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IPC IPC(8): C08G18/12C08G18/66C08G18/44C08G18/32
CPCC08G18/12C08G18/3206C08G18/4018C08G18/4202C08G18/4277C08G18/44C08G18/4808C08G18/4854C08G18/6607C08G18/6611C08G18/664C08G18/6644C08G18/6674C08G18/6677
Inventor 赵雨花王军威亢茂青殷宁李其峰冯月兰
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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