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Preparation method of fiber-grade PTFE spinning emulsion

A fiber grade and emulsion technology, which is applied in the fields of fiber chemical characteristics, textiles and papermaking, single-component synthetic polymer rayon, etc., can solve the problems of weak affinity between PTFE and fiber-forming carrier, fiber defects, etc. Emulsion stability, increase in emulsion viscosity, and the effect of solving the occurrence rate of fiber defects

Pending Publication Date: 2021-10-22
泰兴梅兰新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a preparation method of fiber-grade PTFE spinning emulsion, which can solve the technical problem of fiber defect points caused by weak affinity between PTFE and fiber-forming carrier, thereby improving fiber strength and increasing fiber fineness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] The present invention provides a kind of preparation method of fiber grade PTFE spinning emulsion, it is characterized in that it comprises the following steps: Step 1, at first prepare raw material: take deionized water as medium, perfluoropolyether ammonium carboxylate as the first emulsifier, Paraffin is a stabilizer, ammonium persulfate is an initiator, sodium bisulfite is a reducing agent, sodium dodecylsulfonate is a second emulsifier, acrylic acid is a pH regulator, isopropanol is a chain transfer agent, tetrafluoroethylene For polymerization monomer, polymerization makes dispersed polytetrafluoroethylene emulsion; Step 2, then take the add-on of deionized water as the basis by weight, when deionized water is 100 parts, perfluoropolyether ammonium carboxylate is 1.43×10 -1 ~4.3×10 -1 parts, paraffin is 5 parts, ammonium persulfate is 1.14×10 -2 parts, sodium bisulfite 2.28×10 -2 Parts, sodium dodecyl sulfate is 2.14×10 -2 parts, acrylic is 2.14 x 10 -2 parts...

Embodiment 1

[0022]Example 1. When the volume of the reactor in this example is 100L, add 65L of deionized water and 3.5kg of liquid paraffin into the reactor with a volume of 100L, and perform vacuum replacement treatment. The temperature is controlled at 60°C, and tetrafluoroethylene is added to the The reaction pressure in the reactor was adjusted to 2.0MPa and maintained throughout the process. Add 7.4g of ammonium persulfate, 15g of acrylic acid, 120g of perfluoropolyether ammonium carboxylate, and 7.5g of isopropanol into the reactor with a metering pump; Concentration is 1% sodium bisulfite solution and mixing, continuously add to step reaction kettle with metering pump at 0.7L / h; Ammonium acid solution and 0.72L of sodium dodecylsulfonate solution with a mass percentage concentration of 2% were added to the reaction kettle; the reaction was terminated when the gas mass flow meter display reached 21kg; the polymerization kettle was cooled to below 40°C, and the emulsion was transferr...

Embodiment 2

[0023] Example 2, when the volume of the reactor in this example is 100L, add 65L of deionized water and 3.5kg of liquid paraffin into the reactor with a volume of 100L, and perform pumping and replacement treatment. The temperature is controlled at 60°C, and tetrafluoroethylene is added to the The reaction pressure in the reactor was adjusted to 1.6MPa and maintained throughout the whole process. Add 7.4g ammonium persulfate, 15g acrylic acid, 90g perfluoropolyether ammonium carboxylate, and 7.5g isopropanol into the reactor with a metering pump; Concentration is 1% sodium bisulfite solution and mixing, continuously add to step reaction kettle with metering pump at 0.7L / h; Ammonium acid solution and 0.72L of sodium dodecylsulfonate solution with a mass percentage concentration of 2% were added to the reaction kettle; the reaction was terminated when the gas mass flow meter display reached 12kg; the polymerization kettle was cooled to below 40°C, and the emulsion was transferre...

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Abstract

The invention discloses a preparation method of a fiber-grade PTFE spinning emulsion. The preparation method comprises the following steps: weighing raw materials in parts by weight based on the addition amount of deionized water; putting deionized water and paraffin in the raw materials into a reaction kettle for evacuation replacement treatment, keeping the initial polymerization temperature at 60 DEG C during treatment, maintaining the temperature at 65-70 DEG C in the process, and then adding tetrafluoroethylene for constant-pressure reaction; metering and adding ammonium persulfate, acrylic acid, perfluoropolyether ammonium carboxylate, isopropanol and sodium hydrogen sulfite in raw materials into the reaction kettle; when the metering reading reaches a specified value, adding perfluoropolyether ammonium carboxylate and sodium dodecyl sulfate into the reaction kettle; and stopping the reaction when the reading of the gas mass flow meter reaches a specified value, cooling to separate paraffin, introducing nitrogen to remove oxygen, neutralizing by using a sodium hydroxide aqueous solution with the mass fraction of 30% until the pH value is 7-7.5, heating to remove the low-boiling-point auxiliary agent, and increasing the solid content of the PTFE resin to 45-60% by using a concentration process.

Description

technical field [0001] The invention relates to the technical field of fluorine-containing plastics and a preparation method thereof, in particular to a preparation method of fiber-grade PTFE spinning emulsion. Background technique [0002] PTFE fiber has excellent performance, does not absorb water, has good non-stickiness, lubricity and air tightness, improves the weakness of poor oxidation resistance, and still has excellent chemical corrosion resistance at high temperatures, so the filter containing PTFE fiber components The material has been widely used as filter material in high temperature, strong acid, alkali and other environments, and has become the first choice for special working conditions such as waste incineration, blast furnace gas purification, and cement kiln exhaust gas. Emulsion spinning method is the main method used in industry, but due to the weak affinity between PTFE emulsion and fiber-forming carrier, it is usually difficult for the carrier to compl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/26C08F220/06C08F4/40C08F2/26C08F2/38D01F6/32
CPCC08F214/265C08F4/40C08F2/26C08F2/38D01F6/32C08F220/06
Inventor 司耀俊徐明钱厚琴
Owner 泰兴梅兰新材料有限公司
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