Tetrafluoroethylene dispersion resin for manufacturing long fiber for base cloth and preparation method of tetrafluoroethylene dispersion resin

A tetrafluoroethylene, dispersing resin technology, applied in the direction of chemical characteristics of fibers, textiles and papermaking, one-component synthetic polymer rayon, etc. problems, to achieve the effect of low cost, high production efficiency and stable operation

Active Publication Date: 2017-08-18
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] At present, there are various kinds of tetrafluoroethylene dispersion resins used in the manufacture of long fibers, but the production process is relatively complicated, and various additives or modified monomers need to be added, and the molecular weight distribution is unstable, which leads to difficulties in long fiber processing and unstable performance of the final product.

Method used

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  • Tetrafluoroethylene dispersion resin for manufacturing long fiber for base cloth and preparation method of tetrafluoroethylene dispersion resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1: Add 50% volume deionized water into the polymerization kettle, after vacuuming, add fluorine-containing surfactant, emulsion stabilizer, pH regulator and initiator, stir evenly, then pass in modified monomer, and Continue to add tetrafluoroethylene monomer until the pressure in the polymerization tank is 1.8MPa to start the reaction. During the reaction, the stirring speed is 60r / min, and the reaction time is 30min; add fluorine-containing surfactant accounting for 40% of the total addition amount;

[0029] Step 2: Continue to add the remaining tetrafluoroethylene monomer and fluorine-containing surfactant accounting for 40% of the total addition amount, and increase the rotation speed to 50-60r / min; the reaction time is 90min;

[0030] Step 3: After step 2, add the remaining fluorine-containing surfactant, accounting for 20% of the total addition amount, maintain the rotation speed at 30-40r / min, and the reaction time: 30minmin, to obtain the emulsion;

[0031]...

Embodiment 2

[0035] Step 1: Add 70% volume deionized water into the polymerization kettle, after vacuuming, add fluorine-containing surfactant, emulsion stabilizer, pH regulator and initiator, stir evenly, then pass in modified monomer, and Continue to add tetrafluoroethylene monomer until the pressure in the polymerization tank is 2.5MPa to start the reaction. During the reaction, the stirring speed is 70r / min, and the reaction time is 35min; add fluorine-containing surfactant accounting for 40% of the total addition amount;

[0036] Step 2: Continue to add the remaining tetrafluoroethylene monomer and fluorine-containing surfactant accounting for 40% of the total addition amount, and increase the rotation speed to 50-60r / min; the reaction time is 90min;

[0037] Step 3: After step 2, add fluorine-containing surfactant accounting for 20% of the total addition amount, maintain the rotation speed at 40r / min, and the reaction time: 30min to obtain the emulsion;

[0038]The total reaction tim...

Embodiment 3

[0041] A kind of preparation method of the tetrafluoroethylene dispersed resin of long fiber for making base cloth, comprises the steps:

[0042] Step 1: Add 2600L of deionized water to a 4000L polymerization kettle with a horizontal spiral stirrer, vacuumize, add 1.2kg of ammonium perfluorooctanoate, 75kg of paraffin, 1.3kg of succinic acid and 7g of ammonium persulfate, and close the inlet and outlet with nitrogen Replace and analyze that the oxygen content is less than 20ppm, raise the temperature of the reactor to 75°C, add hexafluoropropylene, and continue to add tetrafluoroethylene monomer until the pressure in the kettle is 2.2Mpa, stir at a speed of 65r / min, start the reaction, and react for 30min;

[0043] Step 2: Continue to add the remaining tetrafluoroethylene monomer and 1.2kg ammonium perfluorooctanoate, increase the rotation speed to 55r / min, and continue the reaction for 90min; the added amount of hexafluoropropylene is 90kg;

[0044] Step 3: After step 2, add ...

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Abstract

The invention relates to the technical field of polymer resin and particularly relates to tetrafluoroethylene dispersion resin for manufacturing a long fiber for base cloth and a preparation method of the tetrafluoroethylene dispersion resin. The preparation method comprises the steps of adding about 60% of deionized water to a polymerization reactor, evacuating and then adding a fluorine-containing surfactant, an emulsion stabilizer, a pH modifier and an initiator; introducing a tetrafluoroethylene monomer to react, adding a surfactant and a modified monomer in the reaction process by stages and controlling the reaction rate and the reaction time by stages to obtain a tetrafluoroethylene emulsion with a specific molecular weight distribution range; and carrying out density deployment, condensation, dehydration and drying on the emulsion to obtain the tetrafluoroethylene dispersion resin. The tetrafluoroethylene dispersion resin obtained through the preparation method is suitable for manufacturing the long fiber through multiple methods and can be used for manufacturing PTFE base cloth, and a filter assembly is synthesized by the tetrafluoroethylene dispersion resin and a PTFE needled filter felt.

Description

technical field [0001] The invention relates to the technical field of polymer resins, in particular to a tetrafluoroethylene dispersed resin for manufacturing long fibers for base cloth and a preparation method thereof. Background technique [0002] Polytetrafluoroethylene, commonly known as Teflon, is known as the "King of Plastics". Its relative molecular weight reaches millions or even tens of millions. , and arranged in a zigzag shape. Due to the large radius of the fluorine atoms, a very stable chemical bond is formed, which can shield and protect the carbon atoms on the main bond, and the molecular chain is difficult to be destroyed. Therefore, PTFE materials have good corrosion resistance, heat resistance and oxidation resistance, and are almost not corroded by any chemical reagents except molten alkali metals. Maintain excellent mechanical properties in a wide temperature range; because the dipole moment of PTFE macromolecules is close to zero and basically non-pol...

Claims

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Application Information

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IPC IPC(8): C08F214/26C08F214/28D01F6/32
CPCC08F214/26D01F6/32C08F214/28
Inventor 徐万鑫徐美燚余道腾王志喜胡张春
Owner 福建三农新材料有限责任公司
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