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Barium-sulfate-filling-modified polytetrafluoroethylene composite

A polytetrafluoroethylene and composite material technology, applied in the field of plastic products, can solve problems such as the influence of the overall structural strength, and achieve the effect of excellent compression and resilience performance and improved dispersion.

Inactive Publication Date: 2018-04-13
ZHEJIANG DEQING CONCEPTFE PLASTIC PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the applicant used this solution to prepare, it was found that black cores would appear inside the composite material, which would affect the strength of the overall structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A modified polytetrafluoroethylene composite material filled with barium sulfate, comprising the following preparation steps:

[0025] A, activation, stir the barium sulfate and the coupling agent evenly, the coupling agent is the titanate coupling agent NDZ-401, and add absolute ethanol to dilute it into a 5wt% coupling agent solution, heat the barium sulfate to 90°C, The coupling agent solution is sprayed onto the barium sulfate, stirred evenly, and passed through a 200-mesh sieve after drying to obtain modified barium sulfate with lipophilic groups on the surface. The weight ratio of coupling agent solution to barium sulfate is 1:50.

[0026] B, mixing materials, mix 1kg modified barium sulfate and 40kgPTFE evenly, dry under high temperature, get the mixture for subsequent use, mix in the high-speed mixer and carry out, the mixed material is put into 100 ℃ oven and baked for 12h, After cooling, the mixed material is obtained, and the mixed material is passed through...

Embodiment 2

[0030] A modified polytetrafluoroethylene composite material filled with barium sulfate, comprising the following preparation steps:

[0031] A, activation, stir barium sulfate and coupling agent evenly, coupling agent is titanate coupling agent NDZ-401, and add absolute ethanol to dilute into 50wt% coupling agent solution, barium sulfate is heated to 90 ℃, The coupling agent solution is sprayed onto the barium sulfate, stirred evenly, and passed through a 150-mesh sieve after drying to obtain modified barium sulfate with lipophilic groups on the surface. The weight ratio of coupling agent solution to barium sulfate is 1:200.

[0032] B, mixing materials, mix 1kg modified barium sulfate and 99kgPTFE evenly, dry under high temperature, get the mixture for subsequent use, mix in the high-speed mixer and carry out, the mixed material is put into 200 ℃ baking oven for 4h, After cooling, the mixed material is obtained, and the mixed material is passed through a 150-mesh sieve.

...

Embodiment 3

[0036] A modified polytetrafluoroethylene composite material filled with barium sulfate, comprising the following preparation steps:

[0037] A, activation, stir barium sulfate and coupling agent evenly, the coupling agent is titanate coupling agent NDZ-401, and add absolute ethanol to dilute to 10wt% coupling agent solution, barium sulfate is heated to 90 ℃, The coupling agent solution is sprayed onto the barium sulfate, stirred evenly, and passed through a 250-mesh sieve after drying to obtain modified barium sulfate with lipophilic groups on the surface. The weight ratio of coupling agent solution to barium sulfate is 1:65.

[0038] B, mixing, mix 60kg modified barium sulfate and 40kgPTFE evenly, dry under high temperature, get the mixture for subsequent use, mix and carry out in the high-speed mixer, the material after mixing is put into 120 ℃ of baking ovens and baked 10h, After cooling, the mixed material is obtained, and the mixed material is passed through a 100-mesh ...

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PUM

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Abstract

The invention provides a barium-sulfate-filling-modified polytetrafluoroethylene composite and belongs to the technical field of plastic products. The barium-sulfate-filling-modified polytetrafluoroethylene composite is prepared by: A, activating, to be specific, stirring well barium sulfate and a coupling agent to obtain modified barium sulfate containing lipophilic groups on the surface; B, mixing, to be specific, mixing well the modified barium sulfate and PTFE (polytetrafluoroethylene), and drying at high temperature to obtain mixture for use; C, manufacturing a base, to be specific, adding the mixture into a mold, pressing to obtain a base, and stinting the base at a high temperature. The barium-sulfate-filling-modified polytetrafluoroethylene composite has no inner black core and isan excellent washer material and sealing material having excellent compression and elasticity.

Description

technical field [0001] The invention belongs to the technical field of plastic products and relates to a polytetrafluoroethylene composite material modified by barium sulfate filling. Background technique [0002] The high chemical stability of PTFE endows its products with strong alkali and acid resistance, high temperature resistance and other characteristics. It is an indispensable material for solving many key sealing problems in modern science and technology. However, its linear expansion coefficient is large and creep resistance Poor performance limits its scope of application. [0003] Barium sulfate has high density, stable chemical properties, can absorb X-rays and γ-rays, exists as barite in nature, and has a tubular structure. [0004] A Chinese patent discloses a polytetrafluoroethylene / barium sulfate composite material and its preparation method [application number: 201610452784.0], which not only uses steel fibers and carbon fibers to improve the tensile stren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08K9/04C08K3/30
CPCC08K3/30C08K9/04C08K2003/3045C08L27/18
Inventor 吴晓明
Owner ZHEJIANG DEQING CONCEPTFE PLASTIC PROD