Preparation method of special dispersion PTFE oleo-resin for thread seal tape

Abstract

The invention discloses a preparation method of special dispersion PTFE oleo-resin for a thread seal tape, comprising the following step: deionized water is used as a medium, perfluoropolyether ammonium carboxylate is used as an emulsifier, liquid paraffin is used as a stabilizer, ammonium persulfate is used as an initiator, sodium hydrogen sulfite is used as a reducing agent, succinic acid is used as a pH regulator, and tetrafluoroethene is used as a polymerization monomer; the polymerization temperature is 50-60 DEG C, and the pressure is 1.6-3.0 MPa; the reducing agent is added in the dilute solution form of 1% mass concentration at a constant speed within 90 min; and constant-pressure polymerization is conducted to obtain a mixed liquor of the PTFE emulsion and liquid paraffin; and themixed liquor of the PTFE emulsion and liquid paraffin is used as a base material to prepare a modified thread seal tape with special functionality.

Description

technical field [0001] The invention relates to a preparation method of a special dispersed PTFE oil-containing resin for raw material belts. It belongs to the technical field of fluorine-containing plastics and a preparation method thereof. Background technique [0002] Polytetrafluoroethylene raw material tape (PTFE raw material tape) is an excellent sealing material with corrosion resistance and high temperature resistance, which can be used as sealing material for water pipes, corrosive fluid delivery pipes, and steam pipeline joints. The belt has many excellent properties. Such as very low coefficient of friction, non-stick surface, wide operating temperature range -180°C-260°C, excellent insulation, aging resistance and chemical corrosion resistance, etc. [0003] Like other PTFE products, in order to deal with a wider range of applications, different aspects of modification are required, such as applications that require antistatic, anti-friction, etc. Adding filler...

AI Technical Summary

Problems solved by technology

[0003] Like other PTFE products, in order to deal with a wider range of applications, different aspects of modification are required, such as applications that require antistatic, anti-friction, etc. Adding fillers is an effective way, but the uniformity of fillers, Compatibility with extrusion aids will become an unstable factor, so the development of a special PTFE resin for raw tapes with high "compatibility" in this respect will greatly benefit the production process and product performance