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Cross-linked polyethylene composition powder and its prepn

A technology for cross-linked polyethylene and composition, applied in the field of cross-linked polyethylene composition powder and preparation, can solve problems such as adverse effects on coating performance and limited adhesion of matrix materials.

Active Publication Date: 2007-06-06
GUANGZHOU LUSHAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the technical solution disclosed in the above-mentioned patent, the prepared powder coating needs to be constructed under the condition of >180°C, and the adhesion to the matrix material is limited; , causing the powder to have a certain gel content before the powder coating is applied, which adversely affects the performance of the coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 80 parts of low-density polyethylene 1C7A, add 12.5 parts of linear low-density polyethylene 7144 grafted maleic anhydride, 5 parts of high-density polyethylene 8910, antioxidant tris(2,4-di-tert-butylphenyl) phosphite 1 part is extruded and granulated in a twin-screw extruder. After granulation, the material is crushed into an 80-mesh powder in a pulverizer at room temperature, with 1 part of divinylbenzene and 0.5 part of benzoyl peroxide (pure product )well mixed. Preheat the galvanized steel pipe to 160°C, soak it in a fluidized bed for 5 seconds, level it in an oven at 160°C for 10 minutes, take it out and let it cool naturally.

Embodiment 2

[0026] Take 85 parts of low-density polyethylene 1F7B, add 7.5 parts of linear low-density polyethylene 7042 grafted maleic anhydride, 5 parts of high-density polyethylene 5200B, antioxidant tris(2,4-di-tert-butylphenyl) phosphite 1 part, extruded and granulated in a twin-screw extruder, and the granulated material was crushed into an 80-mesh powder in a pulverizer at room temperature, with 1 part of diallyl phthalate and 0.5 part of lauric acid peroxide tert-butyl ester mixed well. Preheat the galvanized steel pipe to 160°C, soak it in a fluidized bed for 5 seconds, level it in an oven at 160°C for 10 minutes, take it out and let it cool naturally.

Embodiment 3

[0028] Take 90 parts of low-density polyethylene 1C7A, add 5 parts of linear low-density polyethylene 7042 grafted maleic anhydride, 1 part of high-density polyethylene 5200B, and 1 part of antioxidant 2,6-di-tert-butylphenol. Extrude and granulate in a screw extruder. After granulation, the material is crushed into 80-mesh powder in a pulverizer at room temperature, and mixed with 2 parts of diallyl phthalate and 1 part of tert-butyl peroxylauricate. uniform. Preheat the galvanized steel pipe to 160°C, soak it in a fluidized bed for 5 seconds, level it in an oven at 160°C for 10 minutes, take it out and let it cool naturally.

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Abstract

The present invention discloses peroxide cross-linked polyethylene composition powder and its production process. The peroxide cross-linked polyethylene composition powder consists of: low density polyethylene of density 0.910-0.925 g / cu cm and MI 2-30 g / 10min in 70-90 weight portions, linear low density polyethylene graft of density 0.910-0.930 g / cu cm and MI 5-20 / 10min in 5-16 weight portions, high density polyethylene of density 0.940-0.960 g / cu cm and MI 0.5-10 g / 10 min in 1-10 weight portions, antioxidant in 0.1-1 weight portion, and cross-linking agent and assistant in 0.1-3 weight portions. Its production process includes extruding polyethylene composition in a double screw extruder to obtain granular composition, mixing the granular composition with cross-linking agent assistant, milling, and mixing with cross-linking agent. The cross-linked polyethylene composition powder may be cross-linking formed at low temperature.

Description

technical field [0001] The invention relates to a peroxide crosslinked polyethylene composition powder and a preparation method. technical background [0002] Compared with conventional coatings, powder coatings have the characteristics of no solvent volatilization, green environmental protection, convenient production and transportation, and convenient construction. Due to the special properties of polyethylene, polyethylene powder coatings have excellent corrosion resistance, non-toxicity, and good durability. However, it also has disadvantages such as low service temperature and poor resistance to environmental stress cracking. Aiming at this characteristic, several patents modify polyethylene by cross-linking. For example, Chinese patent 03104814.5 cross-links polyethylene by peroxide; Chinese patent 03150344.6 cross-links polyethylene by silane. However, according to the technical solution disclosed in the above-mentioned patent, the prepared powder coating needs to b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08J3/12C08J3/24C08K5/14
Inventor 汪加胜王新波唐舫成
Owner GUANGZHOU LUSHAN NEW MATERIALS
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