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Polymerization method for low molecule polytetrafluoroethylene resin

A technology of polytetrafluoroethylene and polymerization method, which is applied in the field of chemical production, can solve the problems of prolonged reaction time, complicated process, and the need to recycle organic solvents, and achieve the effect of uniform molecular weight distribution and particle size distribution

Active Publication Date: 2008-07-09
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polymerization solution obtained by this process is relatively stable. The initiator used is an organic peroxide, and the addition amount is 0.05-5wt% monomer wt. If too much PTFE is added, the molecular weight is very low, the reaction time will be prolonged, and there will be more initiator residues in the solvent. Therefore, it is necessary to treat the end group of PTFE, which makes it complicated and the organic solvent needs to be recovered, and the tail gas needs to be treated, which makes the process complicated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The polymerization method of low-molecular polytetrafluoroethylene resin, concrete method is as follows:

[0025] 1) Add 60 parts by weight of deionized water, 0.4 parts by weight of 10% ammonium perfluorooctanoate and hydrocarbon surfactant TX-4 emulsifier mixed solution, 0.02 parts by weight of ammonium persulfate initiator in a polymerization kettle with agitator , close the polymerization kettle, evacuate and flush with nitrogen, and add 0.03 parts by weight of molecular weight regulator ether under the condition that the oxygen content is less than 30PPm;

[0026] 2) Heat the polymerization kettle, and when the temperature in the polymerization kettle rises to 70° C., add tetrafluoroethylene monomer, make the pressure in the polymerization kettle reach 2.0 Mpa, and carry out constant pressure polymerization under constant stirring conditions;

[0027] 3) During the reaction process, since tetrafluoroethylene polymerization is a strong exothermic reaction, with the ...

Embodiment 2

[0030] The polymerization method of low-molecular polytetrafluoroethylene resin, concrete method is as follows:

[0031] 1) Add 60 parts by weight of deionized water, 0.4 parts by weight of 15% ammonium perfluorooctanoate and hydrocarbon surfactant TX-4 emulsifier mixed solution, 0.02 parts by weight of ammonium persulfate initiator in a polymerization kettle with agitator , close the polymerization kettle, evacuate and flush with nitrogen, and add 0.03 parts by weight of molecular weight regulator ether under the condition that the oxygen content is less than 30PPm;

[0032] 2) Heat the polymerization kettle, and when the temperature in the polymerization kettle rises to 70° C., add tetrafluoroethylene monomer to make the pressure in the polymerization kettle 2.0 Mpa, and carry out constant pressure polymerization reaction under constant stirring conditions;

[0033] 3) During the reaction process, since tetrafluoroethylene polymerization is a strong exothermic reaction, with...

Embodiment 3

[0037] The polymerization method of low-molecular polytetrafluoroethylene resin, concrete method is as follows:

[0038] 1) Add 60 parts by weight of deionized water, 0.5 parts by weight of 10% ammonium perfluorooctanoate and hydrocarbon surfactant TX-4 emulsifier mixed solution, 0.02 parts by weight of ammonium persulfate initiator in a polymerization kettle with agitator , close the polymerization kettle, evacuate and flush with nitrogen, and add 0.03 parts by weight of molecular weight regulator ether under the condition that the oxygen content is less than 30PPm;

[0039] 2) Heat the polymerization kettle, and when the temperature in the polymerization kettle rises to 70° C., add tetrafluoroethylene monomer to make the pressure in the polymerization kettle 2.0 Mpa, and carry out constant pressure polymerization reaction under constant stirring conditions;

[0040] 3) During the reaction process, since tetrafluoroethylene polymerization is a strong exothermic reaction, with...

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PUM

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Abstract

The invention relates to a process for polymerization of low-molecular polytetrafluoroethylene resin, which belongs to the technical field of chemical production. The process comprises utilizing deionized water to be reaction medium, adding a little amount of molecular weight conditioning agent, polymerizing under an initiation system of peroxodisulfate, obtaining fine particles namely polytetrafluoroethylene emulsion after handling polymer which is got, and obtaining concentrated solution or polytetrafluoroethylene particles after handling the emulsion which is obtained. The invention provides an emulsion polymerization system which utilizes aqueous medium ammonium peroxodisulfate to be initiating agent without using dissolvent and without handling terminal group, and the process has the advantages of even molecular weight distribution, even molecular weight distribution, and even grain-size distribution, which is beneficial for industrial production.

Description

[0001] low technology field [0002] The invention relates to a polymerization method of low-molecular polytetrafluoroethylene resin, which belongs to the technical field of chemical production. Background technique [0003] Due to its large molecular weight, large fluorine atomic radius, and good shielding effect, PTFE resin has superior mechanical properties, electrical properties, chemical properties, and weather resistance. The molecular weight of polytetrafluoroethylene is usually around 1 million to 10 million. The molecular weight of low-molecular polytetrafluoroethylene is generally less than 10% of that of polytetrafluoroethylene. Since the polymer is completely composed of carbon atoms and fluorine atoms, the hydrocarbon surfactant has been removed. Although the molecular weight is small, it has full fluorine-containing materials. superior performance. Has excellent high temperature resistance and weather resistance. At the same time, low-molecular polytetrafluoro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F114/26C08F2/24C08F2/38
Inventor 胡庆喜孙百开董金文孔凯张方东
Owner SHANDONG DONGYUE POLYMER MATERIAL
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