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

The technology of raw material tape and resin is applied in the field of preparation of special dispersed PTFE oil-containing resin for raw material tape, which can solve the problems of uniformity, compatibility and instability, achieve uniform molecular weight distribution, good compatibility, and improve tensile properties. Effect

Inactive Publication Date: 2019-07-02
江苏梅兰化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] ⑴Add 65L of water and 3.5kg of liquid paraffin to a 100L reactor, pump it out for replacement, control the temperature at 50°C, then add tetrafluoroethylene to the reactor, adjust the pressure to 2.0MPa and maintain it throughout.

[0015] (2) Add 7.4g of ammonium persulfate, 15g of succinic acid, and 120g of perfluoropolyether ammonium carboxylate into the reactor in step (1) with a metering pump;

[0016] (3) With a metering pump, 1.48L of sodium bisulfite solution with a mass percentage concentration of 1% is continuously added to step (1) reactor;

[0017] ⑷ When the gas mass flow meter shows 7kg, add 80g of perfluoropolyether ammonium carboxylate solution into the reaction kettle with a metering pump;

[0018] (5) Terminate the reaction after adding the sodium bisulfite solution;

[0019] (6) Add 25L of graphite dispersion with a mass percentage concentration of 10% (the present invention provides a method rather than a specific filler, graphite is used as an exam...

Embodiment 2

[0024] Change the graphite dispersion liquid described in step (6) into titanium dioxide dispersion liquid in embodiment 1, and other operations are the same as embodiment 1.

[0025] The raw material tape finally prepared in this example has a uniform appearance and color, no defect points, no color fading after rubbing, and no abnormality in the tensile data.

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): C08L27/18C08L91/06C08K3/04C08K3/22C08F114/26C08F2/26
CPCC08F2/26C08F114/26C08K2003/2241C08K2201/017C08L27/18C08L91/06C08K3/04C08K3/22
Inventor 司耀俊钱厚琴吴玉勋
Owner 江苏梅兰化工有限公司
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