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Preparation method of vermiculite-based high temperature-resistant sealing material

A sealing material and high-temperature-resistant technology, which is applied in the field of preparation of vermiculite-based high-temperature-resistant sealing materials, can solve the problems of flexible graphite gasket oxidation, weight loss of sealing materials, and reduced sealing performance, so as to facilitate dispersion, promote coating, and prevent The effect of reunion

Active Publication Date: 2017-09-22
WUHAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the temperature exceeds 400°C, the sealing performance of the flexible graphite sealing material gradually decreases, and the edge of the flexible graphite gasket begins to oxidize, and then quickly spreads to most of the material, resulting in a large amount of weight loss of the sealing material, resulting in its sealing failure. It greatly restricts its application in the field of high temperature flue gas pipe sealing

Method used

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  • Preparation method of vermiculite-based high temperature-resistant sealing material
  • Preparation method of vermiculite-based high temperature-resistant sealing material
  • Preparation method of vermiculite-based high temperature-resistant sealing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This example provides a preparation method for preparing a vermiculite-based high temperature resistant sealing material:

[0032] 1) Raw material formula

[0033] High-temperature expanded vermiculite powder 500g, chemically expanded vermiculite powder 500g, modifier vinyltriethoxysilane (A151) 5g, nitrile rubber 30g, vulcanizing agent dicumyl peroxide (DCP) 2.5g.

[0034] 2) Preparation process

[0035] Add water to adjust the concentration of the mixed material to 35%, send it into a vacuum kneader, add modifier A151 to modify at room temperature for 1.5 hours, add nitrile rubber and vulcanizing agent DCP, and vacuum knead for 1 hour to obtain a mixed vermiculite slurry, and then use an adjustable The film applicator preforms the slurry with a scraper, and controls the drying temperature at 65°C for 3 hours to obtain a vermiculite-based sealing material blank. The moisture content of the blank is 8%, and the preformed blank is placed on a flat vulcanizing machine fo...

Embodiment 2

[0037] This example provides a preparation method for preparing a vermiculite-based high temperature resistant sealing material:

[0038] 1) Raw material formula

[0039] High-temperature expanded vermiculite powder 250g, chemically expanded vermiculite powder 750g, modifier γ-mercaptopropyltrimethoxysilane (A189) 10g, styrene-butadiene rubber 50g, vulcanizing agent sulfur 3g.

[0040] 2) Preparation process

[0041] Add water to adjust the concentration of the mixed material to 40%, send it into a vacuum kneader, add modifier A189 to modify at room temperature for 1.5 hours, add styrene-butadiene rubber and vulcanizing agent sulfur, and knead in vacuum for 1.5 hours to obtain a mixed vermiculite slurry, and then use Adjust the film applicator to preform the slurry with a scraper, and control the drying temperature to 70°C for 2.5 hours to obtain a vermiculite-based sealing material blank. The moisture content of the blank is 8%, and the preformed blank is vulcanized on a fla...

Embodiment 3

[0043] This example provides a preparation method for preparing a vermiculite-based high temperature resistant sealing material:

[0044] 1) Raw material formula

[0045] 750g of high-temperature expanded vermiculite powder, 250g of chemically expanded vermiculite powder, 20g of modifier γ-aminopropyltriethoxysilane (A1100), and 50g of organic silica gel.

[0046] 2) Preparation process

[0047] Add water to adjust the concentration of the mixed material to 45%, send it into a vacuum kneader, add modifier A1100 to modify at room temperature for 1 hour, add silicone rubber, and vacuum knead for 2 hours to obtain a mixed vermiculite slurry, and then use an adjustable film applicator to correct the slurry The material is preformed with a scraper, and the drying temperature is controlled at 75°C, and the drying time is 2h to obtain a vermiculite-based sealing material blank. The moisture content of the blank is 8%, and the preformed blank is vulcanized on a flat vulcanizing machi...

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Abstract

The invention relates to a preparation method of a vermiculite-based high temperature-resistant sealing material. The preparation method comprises the following steps: preparing materials: selecting high-temperature expanded vermiculite powder, chemical expanded vermiculite powder, a modifier and an adhesive; uniformly mixing two types of expanded vermiculite powder and water to obtain a mixed material with the mass concentration of 35-45%; sending the mixed material into a vacuum kneading machine, and adding the modifier for performing surface modification for 0.5-2h; adding the adhesive for performing vacuum kneading for 0.5-2.0h, together with the adhesive; performing coating premoulding on a kneaded slurry, and drying, wherein the moulding thickness is 2.0-4.0mm and the drying temperature is 60-75 DEG C; performing hot-pressing vulcanization moulding on a dried premoulded blank on a hot-pressing vulcanizing machine; cooling and demoulding the material, and cutting into shapes to obtain the vermiculite-based high temperature-resistant sealing materials with different thicknesses. According to a process method of performing coating premoulding first and then performing mould-pressing vulcanization molding, the vermiculite content can reach 95%, the contents of other auxiliary agents are low, and the high temperature resistance of the sealing material is effectively improved.

Description

technical field [0001] The invention relates to a preparation method of a vermiculite-based high-temperature resistant sealing material. Background technique [0002] Expanded polytetrafluoroethylene (ePTFE) gaskets and flexible graphite gaskets are currently more commonly used sealing materials in the static sealing industry. Expanded PTFE gaskets are stretched into fibers by processing and then woven into sealing packing, which is an excellent sealing material. Flexible graphite sealing gaskets are made of expanded graphite after mechanical compression molding. They have good compression resilience and low creep relaxation rate, and are widely used in the sealing field. [0003] In an aerobic environment, expanded polytetrafluoroethylene (ePTFE) gaskets can only withstand a service temperature of 240°C. When the temperature exceeds 400°C, the sealing performance of the flexible graphite sealing material gradually decreases, and the edge of the flexible graphite gasket be...

Claims

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Application Information

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IPC IPC(8): C04B26/04C04B26/32
CPCC04B26/045C04B26/32C04B2111/00482C04B2201/20C04B2201/50C04B14/204C04B24/42C04B24/00C04B22/02
Inventor 钱玉鹏吴益民贺壹城高惠民张凌燕孙利杰王仕江秦煦坤江学峰苗慧男
Owner WUHAN UNIV OF TECH
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