Fluor-containing polymer processing aid, silanes cross-linked polyethylene composition with the processing aid and use of the processing aid

A processing aid and silane cross-linking technology, applied in the field of silane cross-linked polyethylene, can solve problems such as spark failure and breakdown

Active Publication Date: 2011-01-19
GUANGZHOU SHINE POLYMER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In many cases, this phenomenon can lead to spark failure or electrical breakdown

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In a 500ml four-necked bottle, add 80 grams of methyl methacrylate, 15 grams of butyl acrylate, 5 grams of acrylic acid and 0.5 grams of azobisisobutyronitrile, pre-react at 60 ° C for 1 hour, and then dropwise add 100 grams of vinylidene fluoride— Hexafluoropropylene copolymer dispersion (FKM emulsion L636, 30% solid content, purchased from Solvay SolexisS.P.A), high-speed stirring, add 0.2 grams of hydroxypropyl cellulose and dodecylbenzene 0.1 g of sodium sulfonate in 100 g of deionized water, and adjust the pH value to 6 with 20% sodium hydroxide solution. Raise the temperature to 75°C for 5 hours. After cooling, filter with a 200-mesh filter cloth and dry to obtain 118 grams of particles with an average particle diameter of 4.5 mm. Hereinafter referred to as fluoropolymer A.

Embodiment 2

[0035] In a 500ml four-necked bottle, add 60 grams of methyl methacrylate, 25 grams of butyl acrylate, 15 grams of methacrylic acid and 0.5 grams of azobisisobutylcyanide mixture, pre-react at 60 ° C for 1 hour, and then dropwise add 100 grams of partial Vinyl fluoride-hexafluoropropylene copolymer dispersion (FKM emulsion L636, 30% solid content, purchased from Solvay Solexis S.P.A), high-speed stirring, add 0.2 grams of hydroxypropyl cellulose dissolved in it, dodecane Add 0.1 g of sodium phenylsulfonate to 100 g of deionized water, and adjust the pH value to 6 with 20% sodium hydroxide solution. Raise the temperature to 75°C for 5 hours. After cooling, filter with a 200-mesh filter cloth and dry to obtain 107.8 grams of particles with an average particle diameter of 4.5 mm. Hereinafter referred to as fluoropolymer B.

Embodiment 3

[0037] In a 500ml four-necked bottle, add 70 grams of methyl methacrylate, 20 grams of butyl acrylate, 10 grams of acrylic acid and 0.5 grams of azobisisobutylcyanide mixture, pre-react at 60 ° C for 1 hour, and then dropwise add 100 grams of vinylidene fluoride - Hexafluoropropylene copolymer dispersion (FKM emulsion L636, 30% solid content, purchased from Solvay Solexis S.P.A), high-speed stirring, and adding 0.2 grams of hydroxypropyl cellulose and dodecylbenzene 0.1 g of sodium sulfonate in 100 g of deionized water, and adjust the pH value to 6 with 20% sodium hydroxide solution. Raise the temperature to 75°C for 5 hours. After cooling, filter with a 200-mesh filter cloth, and obtain 113 grams of particles with an average particle diameter of 4.5 mm after drying. Hereinafter referred to as fluoropolymer C.

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Abstract

The invention provides a fluorine-containing polymer processing agent, which includes microparticles formed by a core section and a shell section and having a mean particle diameter of 0.2 to 1 mum. The core section is formed from a fluorine-carbon polymer, the shell section is formed from alkyl (meth)acrylates-alpha,beta-olefinic bond unsaturated carboxylic acid copolymer, and the weight ratio of the core section to the shell section is 20:80 to 60:40. The invention also provides a silicane crosslinked polyethylene composition containing the fluorine-containing polymer processing agent, and the application in extrusion molding of silicane crosslinked polyethylene. Silicane crosslinked polyethylene added with the fluorine-containing polymer processing agent has high extrusion speed, and the extruded product has high surface smoothness.

Description

technical field [0001] The present invention relates to a fluoropolymer processing aid, a silane crosslinked polyethylene containing it and applications thereof, in particular to a (meth)acrylic acid copolymer-modified fluoropolymer processing aid, a silane crosslinked polyethylene containing it Ethylene and its applications. 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 caus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/38C08F220/18C08L23/06C08K5/54C08J3/24B29C47/00
Inventor 石建伟刘辉楼文奎
Owner GUANGZHOU SHINE POLYMER TECH
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