Preparation method of dispersion resins filled with polytetrafluoroethylene

A technology of polytetrafluoroethylene and dispersed resin, which is applied in the field of preparation of organic polymer compounds, can solve the problems of uniformity of color of filled PTFE, difficulty in controlling electrical conductivity, etc., and achieve simple and easy-to-operate industrial process, good resin processing performance, and filler separate effect

Active Publication Date: 2014-04-30
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to control the color uniformity and conductivity of filled PTFE

Method used

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  • Preparation method of dispersion resins filled with polytetrafluoroethylene
  • Preparation method of dispersion resins filled with polytetrafluoroethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) In a 5L coagulation bucket (cylindrical, length-to-diameter ratio 2.5:1, 3 layers of stirring blades, six-blade straight paddle), add 3.5L of polytetrafluoroethylene emulsion with a specific gravity of 1.04, and add a surfactant linear secondary Alcohol polyoxyethylene ether (15-S-9, DOW company) 0.74g (3‰), mechanically stirred at 30rpm for 2min and mixed evenly.

[0033] 2) Add 0.48 g (0.2%) of graphite to the polytetrafluoroethylene emulsion obtained in step 1), and mechanically stir at 50 rpm for 10 minutes to obtain an emulsified polytetrafluoroethylene emulsion.

[0034] 3) Add 8 g of electrolyte ammonium bicarbonate to the polytetrafluoroethylene emulsion obtained in step 2), stir at 100 rpm for 5 minutes to obtain filled polytetrafluoroethylene powder, filter the water, wash, and dry in an oven at 160 ° C for 10 hours to obtain filled polytetrafluoroethylene dispersion resin.

[0035] Embodiment 1 obtains resin 240g, gets four parts of samples, measures fill...

Embodiment 2

[0037] 1) Add 3.5L of polytetrafluoroethylene emulsion with a specific gravity of 1.08 to the 5L coagulation bucket (cylindrical, length-to-diameter ratio 2.5:1, 3 layers of stirring blades, six-blade straight paddle), add surfactant branched chain secondary Alcohol polyoxyethylene ether (TMN-6, DOW company) 1.48g (3‰), mechanically stirred at 50rpm for 2min and mixed evenly.

[0038] 2) Add 1.0 g (0.2%) of carbon black to the polytetrafluoroethylene emulsion obtained in step 1), and mechanically stir at 50 rpm for 10 minutes to obtain an emulsified polytetrafluoroethylene emulsion.

[0039] 3) Add 8 g of electrolyte ammonium bicarbonate to the polytetrafluoroethylene emulsion obtained in step 2), stir at 120 rpm for 5 minutes to obtain filled polytetrafluoroethylene powder, filter the water, wash, and dry in an oven at 160 ° C for 10 hours to obtain filled polytetrafluoroethylene dispersion resin.

[0040] Embodiment 2 obtains resin 495g, gets four samples, measures filling ...

Embodiment 3

[0042] 1) Add 3.5L of polytetrafluoroethylene emulsion with a specific gravity of 1.04 to the 5L coagulation bucket (cylindrical, length-to-diameter ratio of 2.5:1, 3 layers of stirring blades, six-blade straight paddle), and add surfactant linear secondary Alcohol polyoxyethylene ether (15-S-9, DOW company) 1.24g (5‰ of the weight of polytetrafluoroethylene), mechanically stirred at 30rpm for 2min and mixed evenly.

[0043] 2) Add 99.2 g (40%) of graphite to the polytetrafluoroethylene emulsion obtained in step 1), and mechanically stir at 50 rpm for 10 minutes to obtain an emulsified polytetrafluoroethylene emulsion.

[0044] 3) Add 8 g of electrolyte ammonium bicarbonate to the polytetrafluoroethylene emulsion obtained in step 2), stir at 100 rpm for 5 minutes to obtain filled polytetrafluoroethylene powder, filter the water, wash, and dry in an oven at 160 ° C for 10 hours to obtain filled polytetrafluoroethylene dispersion resin.

[0045]Embodiment 3 obtains resin 247g, ...

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Abstract

The invention relates to a preparation method of dispersion resins filled with polytetrafluoroethylene. The preparation method comprises the following steps: 1) adding surfactants to polytetrafluoroethylene emulsion with specific gravity of 1.04-1.08g/cm<3>, and mechanically stirring the materials uniformly, wherein the addition of the surfactants is 0.3-0.5% of the weight of polytetrafluoroethylene solid in the emulsion; 2) adding graphite and/or carbon black to the polytetrafluoroethylene emulsion obtained in the step 1), and mechanically stirring the materials; 3) adding electrolyte to carry out chemical and mechanical cohesion, wherein the electrolyte is alkaline or acid and the rotating speed is 1-3 times that in the step 2). The preparation method provided by the invention is simple and practicable and can ensure the mixing uniformity of the filler in the base material. The conductivity and mechanical properties of products are controlled by adjusting the addition of the filler. The preparation method has multiple purposes.

Description

technical field [0001] The invention belongs to the field of organic polymer compounds, and in particular relates to a preparation method of fluorine-containing organic polymer compounds. Background technique [0002] Among PTFE products, filled PTFE products are the one with the largest output. The wear resistance, heat resistance, dimensional stability, electrical conductivity and other properties of PTFE can be improved by adding different fillers such as inorganic, metal and high polymer to PTFE resin. Graphite has stable chemical properties, corrosion resistance, is not easy to react with chemicals such as acids and alkalis, and is resistant to high and low temperatures. It can be used as a filler to improve the wear resistance and electrical conductivity of products. Carbon black can be used as a black dye, and as a filler, it has a reinforcing effect and can also enhance the conductivity of the substrate. [0003] There are three mixing methods for fillers to fill P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/16C08L27/18C08K3/04C08K3/28
Inventor 张春静张建新姚权卫胡显权秦向明苏小龙
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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