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Preparation method of low temperature resistant plastic valve sealing ring

A technology of valve sealing and low temperature resistance, applied in the field of plastic materials, can solve the problems of material hardening and leakage, and achieve the effect of easy-to-obtain raw materials, simple process and strong airtight performance

Inactive Publication Date: 2018-03-23
吴江市强塑阀门管件厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low temperature is relatively rare. Generally, the use of cold-resistant nitrile rubber NBR material is considered at 20 to 40 ° C. Generally, the material will harden and cause leakage in a low temperature environment. For example, such problems often occur in railway locomotives in winter in the north.

Method used

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  • Preparation method of low temperature resistant plastic valve sealing ring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Combine 15 parts of polysulfone, 6 parts of polyamide, 2 parts of polyoxymethylene, 2 parts of wollastonite, 1 part of butylhydroxyanisole, 3 parts of diphenylamine, 1 part of zinc stearate, three ( 1 part of 2,4-di-tert-butylphenyl) phosphite and 1 part of γ-aminopropylmethyl diethoxysilane were injected into the vacuum reactor and stirred and mixed well at a speed of 2000 rpm, stirred and mixed well 15 After a few minutes, heat to 500°C, continue to react for 30 minutes, and reach the mixture, keep it warm for later use;

[0020] (2) Inject the mixture of step (1) into the injection molding machine to perform injection molding, wherein the barrel of the injection molding machine is four barrels, three barrels, and two barrels in the direction from the feed port to the nozzle. The temperature of the first section of the barrel is 210-215°C, the temperature of the second section of the barrel is 205-210°C, the temperature of the third section of the barrel is 200-205°C...

Embodiment 2

[0025] (1) Combine 16 parts of polysulfone, 7 parts of polyamide, 3 parts of polyoxymethylene, 3 parts of wollastonite, 1 part of butylated hydroxyanisole, 3 parts of diphenylamine, 1 part of zinc stearate, four ( β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate) 1 part of pentaerythritol ester and 1 part of aniline methyl triethoxysilane are injected into the vacuum reactor and stirred and mixed evenly, the speed is 2000 rpm / Minutes, stir and mix for 15 minutes, then heat to 520°C, continue to react for 30 minutes, to the mixture, keep warm for later use;

[0026] (2) Inject the mixture of step (1) into the injection molding machine to perform injection molding, wherein the barrel of the injection molding machine is four barrels, three barrels, and two barrels in the direction from the feed port to the nozzle. The temperature of the first section of the barrel is 210-215°C, the temperature of the second section of the barrel is 205-210°C, the temperature of the third section of ...

Embodiment 3

[0031] (1) Mix 19 parts of polysulfone, 9 parts of polyamide, 4 parts of polyoxymethylene, 4 parts of wollastonite, 2 parts of butylhydroxyanisole, 4 parts of diphenylamine, 2 parts of zinc stearate, β- 2 parts of (3,5-di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate and 2 parts of dichloromethyltriethoxysilane are injected into the vacuum reactor and stirred and mixed evenly, the speed is 2000 rpm / Min, stir and mix well for 15 minutes, then heat to 540°C, continue to react for 30 minutes, to the mixture, keep warm for later use;

[0032] (2) Inject the mixture of step (1) into the injection molding machine to perform injection molding, wherein the barrel of the injection molding machine is four barrels, three barrels, and two barrels in the direction from the feed port to the nozzle. The temperature of the first section of the barrel is 210-215°C, the temperature of the second section of the barrel is 205-210°C, the temperature of the third section of the barrel is 200-205...

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Abstract

The invention discloses a preparation method of a low temperature resistant plastic valve sealing ring. According to the preparation method, polysulfone, polyamide, polyformaldehyde, wollastonite, butyl hydroxy anisd, diphenylamine, and zinc stearate are taken as raw materials, an anti-oxidant and a silane coupling agent are added for specific mixing reaction, high temperature reaction and injection moulding are carried out, a specific antifreezing agent is added, and low temperature curing is carried out so as to obtain the low temperature resistant plastic valve sealing ring. The low temperature resistant plastic valve sealing ring is excellent in low temperature resistance, high in sealing performance, and promising in application prospect.

Description

Technical field [0001] The invention relates to the technical field of plastic materials, in particular to a method for preparing a low-temperature resistant plastic valve sealing ring. Background technique [0002] When selecting seals, the working conditions must be considered, so as to select the appropriate seals and materials, and the installation structure. The required condition considerations generally include: temperature, pressure, and medium. Its mechanical seals also need to be considered in combination with the characteristics of the equipment itself. Regarding temperature, such as nitrile rubber materials at 40-120°C. If the operating temperature exceeds 120 degrees Celsius, consider using fluoroelastomer or PTFE material. Low temperature is relatively rare. Generally, the use of cold-resistant nitrile rubber NBR material is considered at 20 to 40°C. Generally, the material will become hard and cause leakage in a low temperature environment. Such problems often o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L81/06C08L77/00C08L71/02C08K13/02C08K3/34C08K5/18C08K5/098C08K5/13B29C45/78
Inventor 钱全
Owner 吴江市强塑阀门管件厂
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