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Linear low-density polyethylene composition

A linear low-density polyethylene technology, applied in the field of polyolefin compositions, can solve problems such as low strength and poor processing performance, and achieve the goals of prolonging service life, balanced melt viscosity, excellent extrusion processability and usability Effect

Active Publication Date: 2012-05-30
XINJIANG TIANYE WATER SAVING IRRIGATION SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to improve the compatibility of polypropylene and polyethylene blends, solve the delamination and separation of pipes, improve the shortcomings of poor processability and low strength of linear low-density polyethylene compositions, and provide a processing A linear low-density polyethylene composition with excellent performance, good impact strength, tensile strength, elongation at break, high pressure resistance, burst strength, chemical stability, heat resistance and flexibility

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 2000g of linear low density polyethylene with a density of 0.918g / cm 3 , melt flow index is 10g / 10min; low density polyethylene 1800g, density is 0.910g / cm 3 , melt flow index is 30g / 10min; high-density polyethylene 1500g, density is 0.941g / cm 3 , melt flow index is 10g / 10min; polypropylene 1000g, density is 0.830g / cm 3 , melt flow index is 50g / 10min; ethylene-vinyl acetate 500g, density is 0.926g / cm 3 ; Tetrafluoroethylene-hexafluoropropylene copolymer 0.4g; Maleic anhydride and ethylene-vinyl acetate copolymer 400g, melt flow index is 50g / 10min; 4,4'-thiobis(2-methyl-6- tert-butylphenol) 10g; carbon black 10g. Put the measured components into a high-speed mixer and mix evenly. The mixing time is 12 minutes, the speed is 145 rpm, and then added to the twin-screw extruder to melt and blend at a temperature of 140-200 ° C, extruded and granulated . After the pellets are dried, the pipe is extruded on the pipe extrusion unit at a temperature of 140-200°C. The o...

Embodiment 2

[0020] Weigh 3920g of linear low density polyethylene with a density of 0.920g / cm 3 , melt flow index is 5g / 10min; low density polyethylene 500g, density is 0.918g / cm 3 , melt flow index is 15g / 10min; high-density polyethylene 20g, density is 0.955g / cm 3 , melt flow index is 4.7g / 10min; polypropylene 1800g, density is 0.880g / cm 3 , melt flow index is 25.2g / 10min; ethylene-vinyl acetate 4g, density is 0.932g / cm 3 0.4g of tetrafluoroethylene-hexafluoropropylene copolymer; 0.4g of vinylidene fluoride-hexafluoropropylene copolymer; 50g of maleic anhydride and ethylene-vinyl acetate copolymer, the melt flow index is 25.3g / 10min; 4, 20 g of 4'-thiobis(2-methyl-6-tert-butylphenol); 0.4 g of carbon black. Put the measured components into a high-speed mixer and mix evenly. The mixing time is 12 minutes and the speed is 145 rpm. Then the pipe is extruded on the pipe extruder at a temperature of 140-200°C. The appearance of the obtained pipe is Smooth, good flexibility, high mechanic...

Embodiment 3

[0022] Weigh 3000g of linear low density polyethylene with a density of 0.922g / cm 3 , melt flow index is 0.1g / 10min; low density polyethylene 20g, density 0.925g / cm 3 , the melt flow index is 0.1g / 10min; high-density polyethylene 1800g, the density is 0.970g / cm 3 , melt flow index is 0.5g / 10min; polypropylene 20g, density is 0.910g / cm 3 , melt flow index is 0.5g / 10min; ethylene-vinyl acetate 500g, density 0.939g / cm 3; rheology modifier masterbatch 40g; maleic anhydride graft copolymer 20g, melt flow index is 0.5g / 10min; 1,3,5-trimethyl-2,4,6-three (3,5 - 0.4 g of di-tert-butyl-4-hydroxybenzyl)benzene; 5 g of carbon black. The produced pipe has smooth appearance, good flexibility, high mechanical strength, and the elongation at break is increased by 21%.

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Abstract

The invention relates to a linear low-density polyethylene composition comprising components of, by weight: 50-98 parts of linear low-density polyethylene with a density of 0.918-0.922g / cm<3> and a melt flow index of 0.1-10g / 10min, 0.5-45 parts of low-density polyethylene with a density of 0.910-0.925g / cm<3> and a melt flow index of 0.1-30g / 10min, 0.5-45 parts of high-density polyethylene with a density of 0.941-0.970g / cm<3> and a melt flow index of 0.5-10g / 10min, 0.5-45 parts of polypropylene with a density of 0.830-0.910g / cm<3> and a melt flow index of 0.5-50g / 10min, 0.1-20 parts of an ethylene-vinyl acetate copolymer with a density of 0.926-0.939g / cm<3>, 0.01-1 part of a rheology modifying agent, and 0.5-20 parts of a compatibilizing agent with a melt flow index of 0.5-50g / 10min. With the composition, extrusion processing performance can be effectively improved, a melt fracture phenomenon can be eliminated, and the compatibility can be improved. With the composition, the strength, flexibility and aging resistance of a product can be improved. The composition can be used for producing films, drip irrigation tapes, and pipes with various specifications.

Description

technical field [0001] The invention relates to a polyolefin composition, in particular to a linear low-density polyethylene composition. Background technique [0002] Linear low-density polyethylene is the third generation of polyethylene after low-density polyethylene and high-density polyethylene. Injection molded products. Products made of linear low-density polyethylene have good flexibility, high impact resistance and tensile strength, but its processing performance is relatively poor, the melt viscosity is high, the strength is low, and the melt fracture is serious, so it is used to extrude Processing and molding are more difficult. [0003] Chinese patent CN1247878 discloses a low-density polyethylene composition and its pipe material. Its composition is mixed with low-density polyethylene, high-density polyethylene, polypropylene, and ethylene / α-olefin copolymer in an appropriate proportion. Additives (such as: stabilizers, flow modifiers, dispersants, colorants)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08L23/06C08L23/12
Inventor 张友新魏妍丽李双全
Owner XINJIANG TIANYE WATER SAVING IRRIGATION SYST
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