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Fluorine-containing polymer processing aid and preparation method thereof

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: 2017-07-14
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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  • Fluorine-containing polymer processing aid and preparation method thereof
  • Fluorine-containing polymer processing aid and preparation method thereof
  • Fluorine-containing polymer processing aid and preparation method thereof

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 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 layers, the water layer was partitioned, the oil layer was washed to neutrality, distilled and dried to remove toluene, and 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. A corpuscule consists of a core part and a shell, wherein the core part consists of fluorocarbon polymers; the shell consists of organic silicon-modified nanometer silicon; and the nanometer silicon is the organic silicon-modified nanometer silicon which contains hydrogen bonds and hydroxyl. The invention aims to provide the fluorine-containing polymer processing aid. When the fluorine-containing polymer processing aid is used for silane crosslinked polyolefin extrusion processing, extruding speed can be obviously improved, and surface smoothness is improved. The fluorine-containing polymer processing aid is a nanometer silicon-modified processing aid, and a shell layer shell part consists of the organic silicon-modified nanometer silicon, so that utilization of an organic polymer and an organic solvent is avoided, after reaction is finished, washing is easy, and pollution to environment is less. The temperature resistance level of the nanometer silicon is very high, so that the fluorine-containing polymer processing aid is wide in application range. The invention also provides the preparation method of the fluorine-containing polymer processing aid.

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 Applications(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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