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Method for improving viscosity of PTFE (polytetrafluoroethylene) dispersed emulsion

A technology for dispersing emulsion and PTFE, which is applied in the field of polymer materials, can solve problems such as insufficient viscosity and unstable concentrated liquid body, and achieve the effect of stabilizing PTFE dispersion emulsion

Inactive Publication Date: 2015-02-25
福建三农新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main problems in the quality of PTFE dispersion emulsion are: 1. Insufficient viscosity
2. The concentrate body is unstable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Get 25kgPTFE dispersion emulsion (viscosity is 15 * 10 -3 Pa·s,) in a mixing bucket, get 50g of ammonium chloride and dissolve it in 100g of warm water, the quality of the ammonium salt is 0.20% of the quality of the dispersed emulsion, start stirring, slowly pour the prepared brine into the mixing bucket and stir for 3min, The stirring speed is 20r / min, and the viscosity obtained after stirring is 36.5×10 -3 Pa·s PTFE dispersion emulsion.

Embodiment 2

[0015] Get 50kgPTFE dispersion emulsion (viscosity is 14 * 10 -3 Pa·s,) in a mixing bucket, get 90g of ammonium carbonate and dissolve it in 150g of warm water, the quality of the ammonium salt is 0.18% of the quality of the dispersed emulsion, start stirring, slowly pour the prepared brine into the mixing bucket and stir for 5min, stir The speed is 20r / min, and the viscosity obtained after stirring is 34.5×10 -3 Pa·s PTFE dispersion emulsion.

Embodiment 3

[0017] Get 25kgPTFE dispersion emulsion (viscosity is 14 * 10 -3 Pa·s,) in a mixing bucket, take 42.5g of ammonium bisulfate and dissolve it in 100g of warm water, the quality of the ammonium salt is 0.17% of the quality of the dispersed emulsion, start stirring, slowly pour the prepared brine into the mixing bucket and stir for 5min , the stirring speed is 20r / min, and the viscosity obtained after stirring is 34×10 -3 Pa·s PTFE dispersion emulsion.

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Abstract

The invention belongs to the field of polymer materials and particularly relates to a method for improving viscosity of PTFE (polytetrafluoroethylene) dispersed emulsion. The method includes the steps of dissolving ammonium salt in deionized water to obtain ammonium salt solution, and adding the ammonium salt solution into the PTFE dispersed emulsion. The ammonium salt is one or combination of any of ammonium chloride, ammonium carbonate, ammonium bisulfate, ammonium bicarbonate, ammonium sulfate, ammonium bisulfite and diammonium hydrogen phosphate. The ammonium salt added accounts for 0.01-0.50% of the weight of the PTFE dispersed emulsion. The method has the advantages that the PTFE dispersed emulsion is an emulsifier-concentrated product produced at normal temperature, the problem that the PTFE dispersed emulsion normally produced may have low viscosity is solved, the proper amount of ammonium salt is added to the dispersed emulsion before mixing, the ammonium salt and the PTFE dispersed emulsion are blended according to different ratios, and the PTFE dispersed emulsions of different viscosities are produced.

Description

technical field [0001] The invention relates to a method for increasing the viscosity of PTFE dispersion emulsion, which belongs to the field of polymer materials. Background technique [0002] PTFE dispersion emulsion is a dispersion concentrate in the presence of nonionic surfactant after tetrafluoroethylene polymerization. The appearance is milky white, and the solid content of polytetrafluoroethylene is about 60% (wt). The product treated with the dispersed concentrated solution has excellent chemical corrosion resistance, such as resistance to strong acid, strong alkali, strong oxidant, etc., and has outstanding resistance to chemical corrosion. Heat, cold resistance and friction resistance, as well as excellent electrical insulation, and is not affected by temperature and frequency. [0003] PTFE dispersion emulsion can be directly used to impregnate porous materials such as asbestos products, glass fibers, ceramics and electric carbon products, etc.; it can be used t...

Claims

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Application Information

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IPC IPC(8): C08F6/14C08J3/03C08L27/18
Inventor 张俊杰项冬梅徐万鑫徐美燚
Owner 福建三农新材料有限责任公司
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