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Concentrated sulfuric acid resistant fluoro-rubber sealing spacer

A technology of sealing gasket and fluororubber, which is applied in other chemical processes, chemical instruments and methods, etc., can solve the problems of expensive gaskets, high maintenance costs, and difficulty in ensuring the normal use of gaskets.

Active Publication Date: 2005-11-23
蒋惠成
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After use, it was found that under the action of concentrated sulfuric acid and compression, the heat plate could be used normally for the first 18 months. After 18 months, the gasket lost more weight, and the compression deformation was greater than the assembly requirements of the plate heat exchanger. It was difficult to ensure the gasket The plate heat exchanger continues to be used normally, and the gasket is expensive, and the maintenance cost of a replacement is relatively high, so the application of the plate heat exchanger in the sulfuric acid industry is limited

Method used

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  • Concentrated sulfuric acid resistant fluoro-rubber sealing spacer
  • Concentrated sulfuric acid resistant fluoro-rubber sealing spacer
  • Concentrated sulfuric acid resistant fluoro-rubber sealing spacer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 60 parts of tetrapropyl fluororubber, 40 parts of 23 type fluorine rubber, 2.5 parts of vulcanizing agent dicumyl peroxide, 4.5 parts of co-curing agent triallyl cyanurate, 15 parts of filler spray carbon black, filler barium sulfate 18 parts and 2 parts of lubricant polyethylene wax, put in a container, stir and mix evenly, then molded, and after secondary hot air treatment, the finished product of concentrated sulfuric acid resistant fluororubber sealing gasket is obtained.

Embodiment 2

[0021] Take 65 parts of tetrapropylene fluoro rubber, 35 parts of 23 type fluoro rubber, 2.8 parts of dicumyl peroxide, 4 parts of triallyl cyanurate, 18 parts of spray carbon black, 15 parts of barium sulfate and 2.2 parts of polyethylene wax Put it in a container, stir and mix evenly, mold it, and heat it for the second time to get the finished product of concentrated sulfuric acid resistant fluororubber sealing gasket.

Embodiment 3

[0023] Take 63 parts of tetrapropylene fluoro rubber, 38 parts of 23 type fluoro rubber, 2.6 parts of dicumyl peroxide, 4.3 parts of triallyl cyanurate, 17 parts of spray carbon black, 16 parts of barium sulfate, 2.1 parts of polyethylene wax 1 part and 0.6 part of thickening aid, placed in a container, stirred and mixed evenly, molded, and treated with hot air for the second time to obtain the finished product of concentrated sulfuric acid resistant fluororubber sealing gasket. The tackifier is mixed with asphalt and resin, and the mixing weight ratio of the two is 1:2-5. The structural formula of described resin is:

[0024]

[0025] Note:

[0026] Type 23 fluororubber is a rubbery copolymer prepared by suspension polymerization of vinylidene fluoride and chlorotrifluoroethylene [Rubber Industry Handbook Revised Edition Volume 1, Raw Rubber and Skeleton Materials Page 606, Chemical Industry Press , Xie Suizhi, Liu Dengxiang, Zhou Mingluan, the third printing in Beijing ...

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Abstract

The invention relates to a concentrated sulfuric acid resistant fluoro-rubber sealing spacer which comprises the following raw material (by weight ratio), terafluoroethylene-propylene rubber 60-65, type 23 fluoro rubber 35-40, dicumyl peroxide 2.5-2.8, triallyl cyanurate 4-4.5, spraying carbon black 15-18, barium sulfate 15-18, lubricating agent 2-2.2.

Description

Technical field: [0001] The invention relates to a sealing gasket, in particular to a concentrated sulfuric acid resistant fluorine rubber sealing gasket. It is mainly used as a seal for plate heat exchangers in concentrated sulfuric acid cooling posts. It belongs to the technical field of seals. Background technique: [0002] The plate heat exchanger used for concentrated sulfuric acid cooling post is composed of three major components: heat exchanger frame, corrugated heat exchanger sheet and tetrapropylene fluorine rubber sealing gasket. The sealing gasket is also one of the most critical parts of the plate heat exchanger. It must not only be resistant to concentrated sulfuric acid, but also maintain good elasticity and low compression deformation to ensure that the heat exchanger remains completely intact during a long period of use. In a sealed state, the equipment can operate normally without leakage. [0003] Before the present invention was made, conventional tetr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/12
Inventor 蒋惠成
Owner 蒋惠成
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