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Fluoropolymer processing aid and method of making the same

A technology of processing aids and fluorocarbon polymers, which is applied in the field of fluoropolymer processing aids and its preparation, can solve the problems of lowering and modifying processing aids, the use of temperature restrictions, more organic solvents, and more waste water, etc., to avoid Electric breakdown phenomenon, high temperature resistance level, low pollution effect

Active Publication Date: 2019-05-07
于慧生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this patent also has a certain processing performance, but because its shell is an organic polymer, more organic solvents are needed in the synthesis process, and more waste water is produced by washing after the reaction, thus causing pollution
The existence of organic matter also lowers the limit of the use temperature of the modified processing aid, and the use temperature has certain limitations.

Method used

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  • Fluoropolymer processing aid and method of making the same
  • Fluoropolymer processing aid and method of making the same
  • Fluoropolymer processing aid and method of making the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 6 grams of silane coupling agent A-172, concentrated hydrochloric acid, and 3 ml of deionized water into a 250 ml three-neck flask equipped with a thermometer, reflux device and stirring device. The pH value of the reaction solution is 2, and quickly drop 15 grams of Surface treatment of the nano-silicon, then start stirring, dropwise add 50 grams of poly FKM concentrated dispersion (FKM emulsion L636, 30% solid content, purchased from Solvay Solexis S.P.A) in 1 hour, after 1 hour, add 50ml toluene to extract After 1 hour, the reaction solution was poured into a separatory funnel for stratification, the water layer was partitioned, the oil layer was washed to neutrality, and after distilling and drying to remove toluene, 29.1 grams of white powdery solids were obtained as white microspheres. The weight ratio of the nano-silicon is 60:40, the average particle size is 0.5mm, and the measured hydrogen bond / hydroxyl ratio of nano-silicon is 0.59.

Embodiment 2

[0038] Add 7.2 grams of silane coupling agent KH-570, concentrated hydrochloric acid, and 3 ml of deionized water into a 250 ml three-necked flask equipped with a thermometer, reflux device and stirring device. The pH value of the reaction solution is 3, and quickly drop 16 grams of Surface treatment of the nano-silicon, then start stirring, and drop tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride copolymer (weight-average molecular weight is 2,000,000) in 1 hour, after 1 hour, add 50ml toluene to extract, 1 After one hour, the reaction solution was poured into a separatory funnel to separate the layers, the water layer was partitioned, the oil layer was washed to neutrality, and after distilling and drying to remove toluene, 29.1 grams of white powdery solids were obtained as white microspheres, the weight of the core and the shell. The ratio is 50:50, the average particle size is 0.6mm, and the measured hydrogen bond / hydroxyl ratio of nano-silicon is 0.73.

Embodiment 3

[0040]Add 8.3 grams of silane coupling agent KH-560, concentrated hydrochloric acid, and 3 ml of deionized water into a 250 ml three-neck flask equipped with a thermometer, reflux device and stirring device. The pH value of the reaction solution is 5, and quickly drop 20 grams of Surface treatment of nano-silicon, then start stirring, dropwise add 35 grams of poly FKM concentrated dispersion (FKM emulsion L636, 30% solid content, purchased from Solvay Solexis S.P.A) in 1 hour, after 1 hour, add 50ml toluene to extract After 1 hour, the reaction solution was poured into a separatory funnel for stratification, the water layer was partitioned, the oil layer was washed to neutrality, and 29.1 grams of white powdery solids were obtained after distilling and drying to remove toluene, which were white microspheres, the core and the shell The weight ratio of the part is 40:60, the average particle size is 0.73mm, and the measured hydrogen bond / hydroxyl ratio of nano-silicon is 0.82.

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Abstract

The invention relates to a processing aid, in particular to a fluorine-containing polymer processing aid and a preparation method thereof. Microparticles formed by a core and a shell, the core is made of fluorocarbon polymer, and the shell is made of organosilicon-modified nano-silicon. Nano-silicon refers to organosilicon-modified nano-silicon containing hydrogen bonds and hydroxyl groups. The purpose of the present invention is to provide a processing aid for fluorine-containing polymers. When the processing aid is used for extrusion processing of silane crosslinked polyolefins, it can significantly increase the extrusion speed and improve the surface finish. The present invention is nano-silicon modified The shell is made of organosilicon-modified nano-silicon, avoiding the use of organic polymers and organic solvents, easy to wash after the reaction, and low pollution to the environment. Moreover, the nano-silicon has a high temperature-resistant grade and a wider application range; the invention also provides a preparation method thereof.

Description

technical field [0001] The invention relates to a processing aid, in particular to a fluorine-containing polymer processing aid and a preparation method thereof. Background technique [0002] During the extrusion process of the polymer, there is a critical shear rate. Below the critical shear rate, the surface of the extrudate is smooth, but if the critical shear rate is exceeded, the surface of the extrudate will become rough. Melt fracture will appear in different states with the increase of shear rate. When the extrusion shear rate is higher than the critical shear rate, the resistance of the die wall of the equipment to the melt increases, causing the relative flow rate of the melt at the edge to be small, and a large amount of elastic energy is stored in the melt at the exit of the die. The stresses caused by the elastic springback that occurs here tear the melt, forming what is known as sharkskin. The extent of melt fracture increases with increasing shear rate. Wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K9/06C08K9/08C08K3/36C08L23/00
CPCC08K3/36C08K9/06C08K9/08C08K2201/011C08L23/00
Inventor 张明伟高攀于慧生
Owner 于慧生
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