Fluoropolymer processing aid, silane-crosslinked polyethylene composition containing same and application thereof

A processing aid, silane cross-linking technology, applied in coatings and other directions, can solve problems such as spark failure and breakdown

Active Publication Date: 2011-12-21
上海鲁聚聚合物技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In many cases, this phenomenon can le...

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  • Fluoropolymer processing aid, silane-crosslinked polyethylene composition containing same and application thereof

Examples

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preparation example Construction

[0016] The preparation method of the above-mentioned MQ silicone resin is to first add a head sealant and a silicate monomer, a strong acid such as hydrochloric acid or sulfuric acid, deionized water, and a solvent such as toluene, xylene, methyl ethyl ketone or ethanol to the reactor. or a mixture of two or more. Then add the core emulsion solution while stirring, carry out hydrolysis and condensation, keep the hydrolysis state and stir the reaction for 1-10 hours, preferably 2-5 hours, so that the reaction is complete. Finally add toluene for extraction, the extraction process is 1-4 hours, preferably 1-2 hours later, pour the reaction solution into a separatory funnel to separate layers, divide the water layer, wash the oil layer until neutral, distill and dry to remove toluene to obtain fluorine-containing polymer The polymer processing aid is dried to make the water content less than 5%, preferably less than 1%, to obtain the finished polymer processing aid.

[0017] In ...

Embodiment 1

[0028] Add 6 grams of hexamethyldisiloxane, 0.3 ml of concentrated hydrochloric acid, 3 ml of deionized water and a mixture of 6 ml of ethanol in a 250 ml three-neck flask with a thermometer, a reflux device and a stirring device, then start stirring, and then 50 g of poly FKM concentrated dispersion (FKM emulsion L636, 30% solids, purchased from Solvay Solexis S.P.A) was added dropwise within hours. Then quickly drop 15 grams of tetraethyl orthosilicate for hydrolysis and condensation. After hydrolysis for 1 hour, add 50ml of toluene for extraction. After 1 hour, pour the reaction solution into a separatory funnel for layering. After distillation and drying to remove toluene, 29.1 grams of white powdery solids were obtained as white microspheres, with an average particle diameter of 0.5 mm, wherein the fluorocarbon polymer content was 38% by weight, and the measured M / Q ratio of the silicone resin was 0.59.

Embodiment 2

[0030] The manufacturing process is the same as in Example 1, except that the silane monomer is replaced by 7.2 grams of 1,3 divinyl-1,1,3,3,-tetramethyldisiloxane and 12 grams of ethyl orthosilicate. The reaction product was washed and dried to obtain 27.5 g of processing aids, which were white microspheres with an average particle diameter of 0.57 mm, the fluorocarbon polymer content was 40% by weight, and the measured M / Q of the silicone resin was 0.73.

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Abstract

The invention provides a fluoropolymer processing aid. The fluoropolymer processing aid is particles which are formed by a core part and a shell part and have average particle diameter of 0.2 to 1 micron, wherein the core part is made of fluorocarbon polymer, the shell part is made of MQ silicon resin, the ratio of M to Q is 0.5 to 0.9, and the weight ratio of the core part to the shell part is 20:80-45:55. The invention also provides a silane cross-linked polyethylene composition containing the processing aid and application of the fluoropolymer processing aid in silane cross-linked polyethylene extrusion molding. Not only the silane cross-linked polyethylene added with the fluoropolymer processing aid has high extrusion velocity, but also the extruded product has high surface finishment.

Description

technical field [0001] The present invention relates to a fluoropolymer processing aid, a silane crosslinked polyethylene containing it and its application, in particular to a silicone resin-modified fluoropolymer processing aid, a silane crosslinked polyethylene containing it and its application. 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 t...

Claims

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Application Information

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IPC IPC(8): C08J7/04C08L27/12C08G77/06C08L23/06B29C47/00
Inventor 智锋高攀
Owner 上海鲁聚聚合物技术有限公司
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