Preparation method of hydrophilic flexible graphite composite sealing material

A technology of flexible graphite and composite sealing, applied in the direction of synthetic cellulose/non-cellulose material pulp/paper, chemical instruments and methods, fiber raw material processing, etc., can solve the problems of bonding, low density, uneven distribution of flexible graphite, etc. Achieve the effect of uniform texture, simple preparation method and good sealing performance

Active Publication Date: 2019-05-21
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems that the current flexible graphite is hydrophobic, low density, unable to combine with mixed fibers, fillers and other additives, and the flexible graphite is unevenly distributed after the sealing material is processed and formed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step 1: Prepare a 5% polyvinyl alcohol solution in a beaker and keep the temperature at 30°C. Mix flexible graphite and polyvinyl alcohol evenly at a mass ratio of 1:1, then add 5% urea-formaldehyde resin relative to the mass of polyvinyl alcohol, and stir for 10 minutes. Dry in an oven at 60°C to obtain hydrophilic flexible graphite. Disperse the hydrophilic flexible graphite in water at 40°C and stir for 10 min to prepare a 5% hydrophilic flexible graphite solution.

[0019] The second step: take the quality of coniferous wood fiber, which accounts for 7% of the total absolute dry weight percentage, the mass of aramid fiber added accounts for 8%, and the mass of carbon fiber added accounts for 5%, then mix and decompose, and the decompose time is 5min.

[0020] Step 3: Add 30% of the total dry mass of hydrophilic flexible graphite solution as a filler, then add 5% of the total dry mass of diatomite and 35% of the total dry mass of calcium carbonate, and stir the fil...

Embodiment 2

[0023] Step 1: Prepare a 2% polyvinyl alcohol solution in a beaker and keep the temperature at 50°C. Mix flexible graphite and polyvinyl alcohol evenly at a mass ratio of 1:2.5, then add urea-formaldehyde resin with a mass ratio of 10% relative to the mass of polyvinyl alcohol, and stir for 5 minutes. Dry in an oven at 105°C to obtain hydrophilic flexible graphite. Disperse the hydrophilic flexible graphite in water at 25°C and stir for 5 minutes to prepare a hydrophilic flexible graphite solution with a concentration of 10%.

[0024] The second step: take the quality of hardwood fiber, which accounts for 14% relative to the total dry weight percentage, the quality of adding aramid fiber accounts for 12%, and the quality of adding sepiolite fiber accounts for 6%, and then mix and disperse, The defrosting time is 15min.

[0025] Step 3: Add 55% of the total dry mass of hydrophilic flexible graphite solution as a filler, then add 5% of the total dry mass of diatomite and 10% o...

Embodiment 3

[0028] Step 1: Prepare a 3% polyvinyl alcohol solution in a beaker and keep the temperature at 40°C. Mix flexible graphite and polyvinyl alcohol evenly at a mass ratio of 1:1.5, then add urea-formaldehyde resin with a mass ratio of 20% relative to polyvinyl alcohol, and stir for 30 minutes. Dry in an oven at 80°C to obtain hydrophilic flexible graphite. Disperse the hydrophilic flexible graphite in water at 30°C and stir for 15 minutes to prepare a hydrophilic flexible graphite solution with a concentration of 7%.

[0029]Step 2: Take the mass of hardwood fiber and softwood fiber, respectively account for 5% of the total dry weight, 10% of the added aramid fiber, 5% of the added glass fiber, and then Mix and loosen, and the loosening time is 8min.

[0030] The third step: add 40% of the total absolute dry mass of hydrophilic flexible graphite solution as filler, then add 10% of the total absolute dry mass of diatomite and 25% of the total absolute dry mass of calcium carbona...

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PUM

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Abstract

The invention relates to a preparation method of a hydrophilic flexible graphite composite sealing material. The method comprises the following steps: preparing a polyvinyl alcohol solution; uniformlymixing flexible graphite and the polyvinyl alcohol solution; then adding urea resin as a crosslinking agent; drying; dispersing into water to obtain a hydrophilic flexible graphite solution; mixing and defibering plant fibers, aramid fibers and mineral fibers; adding the hydrophilic flexible graphite solution, kieselguhr and calcium carbonate; uniformly mixing; adding aluminum sulfate, styrene-butadiene latex, a sulfur dispersoid, CPAM and bentonite; fully stirring; uniformly dispersing; performing neutral papermaking process, pressing, drying and vulcanization to obtain the hydrophilic flexible graphite composite sealing material. According to the method, the surface of the flexible graphite is covered by polyvinyl alcohol, so that a large quantity of hydroxide radicals are introduced, and the hydrophily is improved; then the urea resin crosslinking agent is added, so that the capacity of the hydrophilic flexible graphite composite sealing material combining with other raw materialsis improved, and finally the uniform sealing material is prepared, and as a result, the compressing resilience of the sealing material is improved, and the product sealing performance is improved.

Description

technical field [0001] The invention belongs to the intersecting field of the rubber industry and the papermaking industry, and relates to a method for preparing a hydrophilic flexible graphite composite sealing material. Background technique [0002] Rubber sealing materials are mainly made of rubber as the basic raw material, combined with other materials, and are mainly used to prevent liquids and fluids from leaking from mechanical parts or instrument parts. It also prevents the internal and external communication of the components, such as sand, dust, air, etc., from entering the inside of the sealing mechanism, which plays a role of complete obstruction. Asbestos fiber has excellent properties in rubber sealing materials. It was originally the main fiber raw material for rubber sealing materials, but it has been banned in recent years because it causes cancer and harms the human body. Flexible graphite (also called expanded graphite) has a loose and porous structure, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/69D21H11/00D21H13/26D21H13/40D21H13/38D21H13/50D21H17/68D21H17/67D21H17/34D21H17/45C09K3/10
Inventor 夏新兴黄善聪马海珠潘娇静曹煜成郭爱莲
Owner ZHEJIANG SCI-TECH UNIV
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