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Composition for preparing monolayer antiseptic polyethylene powder coating and method for preparing composition

A polyethylene powder and composition technology, applied in powder coatings, anti-corrosion coatings, coatings, etc., can solve the problems of molecular structure difference, complex operation process, high production cost, and achieve good mechanical properties, easy coating operation, and coating. Low cost coverage

Inactive Publication Date: 2012-09-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The three-layer (three-PE) structure has high anti-corrosion performance, but its operation process is relatively complicated, and the production cost is high. In addition, the additives in the epoxy powder layer are harmful to the environment.
However, there is always a difference in the molecular structure between the layers in the multilayer structure, which will cause separation between the layers when the ambient temperature changes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 100 parts of linear low density polyethylene, 1 part of maleic anhydride, 0.1 part of peroxide initiator, twin-screw extruder speed 100 rpm, reaction temperature 190°C.

[0023] 25 parts of linear low-density polyethylene grafted with maleic anhydride, 60 parts of high-density polyethylene, 10 parts of ethylene-vinyl acetate copolymer, 5 parts of carbon black, 0.05 parts of antioxidant, 0.05 parts of light stabilizer . The rotational speed of the twin-screw extruder is 120 rpm, and the reaction temperature is 230°C.

[0024] The tensile strength of the composition is 26.5MPa, and the elongation at break is 480%. When the composition is compounded with aluminum foil, its peel strength is 6.1N / cm.

Embodiment 2

[0026] 100 parts of linear low density polyethylene, 1 part of maleic anhydride, 0.1 part of peroxide initiator, twin-screw extruder speed 100 rpm, reaction temperature 190°C.

[0027] 30 parts of linear low-density polyethylene grafted with maleic anhydride, 60 parts of high-density polyethylene, 5 parts of ethylene-vinyl acetate copolymer, 5 parts of carbon black, 0.05 parts of antioxidant, 0.05 parts of light stabilizer . The rotational speed of the twin-screw extruder is 120 rpm, and the reaction temperature is 230°C.

[0028] The tensile strength of the composition is 27.8 MPa, and the elongation at break is 430%. When the composition is combined with aluminum foil, its peel strength is 6.3 N / cm.

Embodiment 3

[0030] 100 parts of linear low density polyethylene, 1 part of maleic anhydride, 0.1 part of peroxide initiator, twin-screw extruder speed 100 rpm, reaction temperature 190°C.

[0031] 25 parts of linear low-density polyethylene grafted with maleic anhydride, 59 parts of high-density polyethylene, 15 parts of ethylene-vinyl acetate copolymer, 1 part of carbon black, 0.3 parts of antioxidant, 0.3 parts of light stabilizer . The rotational speed of the twin-screw extruder is 120 rpm, and the reaction temperature is 230°C.

[0032] The tensile strength of the composition is 25.8 MPa, and the elongation at break is 510%. When the composition is combined with aluminum foil, its peel strength is 7.2 N / cm.

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Abstract

A composition for preparing monolayer antiseptic polyethylene powder coating is made of, by weight, 25-60 parts of melt grafting copolymer of linear low-density polyethylene and functional monomer, 25-60 parts of high-density polyethylene, 5-25 parts of ethylene and vinyl acetate copolymer, 1-5 parts of carbon black, 0.05-0.3 part of antioxidant and 0.05-0.3 part of light stabilizer, wherein the functional monomer can be maleic anhydride, acrylic acid, maleic acid or methyl maleic acid. The components are well mixed and then fed into a double-screw extruder for melt extrusion at the temperature ranging from 190 DEG C to 230 DEG C to obtain the composition for preparing the monolayer antiseptic polyethylene powder coating. The composition for preparing the monolayer antiseptic polyethylene powder coating has fine mechanical property and highly adhesive to metal, the tensile strength ranges from 15MPa to 28MPa, and the peel strength ranges from 6N / mm to 15N / mm. The invention further discloses a method for preparing the composition.

Description

technical field [0001] The invention relates to the application of functionalized polyethylene and its blend, in particular to a composition for preparing a single-layer anticorrosive polyethylene powder coating and a preparation method thereof. Background technique [0002] In the field of pipeline anticorrosion, a three-layer (three-PE) structure is mostly used, mainly including an epoxy powder layer, an adhesive layer, and an outer polyethylene protective layer. The three-layer (three-PE) structure has high anti-corrosion performance, but its operation process is relatively complicated, and the production cost is high. In addition, the additives in the epoxy powder layer are harmful to the environment. Two-layer (two-PE) structure anti-corrosion has been reported in patents (CN1865379A, CN101240134A), which combines the adhesive layer and the outer PE layer to form a two-layer structure of epoxy powder and adhesive PE, which simplifies the pipeline anti-corrosion operatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D151/06C09D123/06C09D123/08C09D7/12C09D5/03C09D5/08C08F255/02F16L58/10
Inventor 柯卓邱敦瑞
Owner CHINA PETROLEUM & CHEM CORP
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