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Method for grafting linear low density polyethylene to polar monomer

A linear low-density, polyethylene grafting technology, applied in the field of linear low-density polyethylene graft modification, can solve the problems of operator eye and skin damage, difficult production process, easy volatilization or sublimation, etc., to ensure uniformity and heat transfer effect, good biocompatibility, and the effect of overcoming material bonding

Inactive Publication Date: 2013-07-31
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Currently commonly used LLDPE graft modified monomers mainly include maleic anhydride (MAH), glycidyl methacrylate (GMA), acrylic acid (AA), methyl methacrylate (MMA), N-cyclohexyl maleic acid Imines, etc. These monomers are often highly toxic, have low boiling points, are volatile or sublimated, and cause damage to the eyes and skin of field operators, and there are great difficulties in the actual production process

Method used

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  • Method for grafting linear low density polyethylene to polar monomer
  • Method for grafting linear low density polyethylene to polar monomer
  • Method for grafting linear low density polyethylene to polar monomer

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Dissolve 5 parts by weight of unsaturated carboxylic acid monomer 1-methacryloylpyrrolidine-2-carboxylic acid in 60 parts of N,N-dimethylformamide (DMF), 2 parts of diphenyl peroxide Acyl (BPO) was dissolved in 10 parts of interface agent xylene; 100 parts of LLDPE particles and 15 parts of the second graft monomer styrene (St) were placed in a reaction vessel containing 300 parts of water, and stirred to make the LLDPE particles evenly Suspend in water; Add the unsaturated carboxylic acid monomer solution and BPO solution into the reaction vessel through a syringe, stir at 60°C under a nitrogen atmosphere for 1.5h, react at 95°C for 2 hours, then cool, wash, filter, and use methanol Extracted with acetone and dried in vacuum to obtain the final grafted product with a grafting rate of 2.1%.

[0028] The invention uses a chemical titration method to measure the grafting rate of unsaturated carboxylic acid monomer grafted LLDPE. The specific method is as follows: firstly...

Embodiment 2

[0033] Dissolve 10 parts by weight of unsaturated carboxylic acid monomer 1-methacryloylpyrrolidine-2-carboxylic acid in 60 parts of N,N-dimethylformamide (DMF), 2 parts of diphenyl peroxide Acyl (BPO) is dissolved in 10 parts of interface agent xylene; 100 parts of LLDPE particles and 10 parts of the second graft monomer styrene (St) are placed in a reaction vessel containing 300 parts of water, and stirred to make the LLDPE particles evenly Suspend in water; Add the unsaturated carboxylic acid monomer solution and BPO solution into the reaction vessel through a syringe, stir at 60°C under a nitrogen atmosphere for 1.5h, react at 95°C for 2 hours, then cool, wash, filter, and use methanol and acetone extraction, vacuum drying, the final grafted product can be obtained, and its grafting rate is 5.3%.

Embodiment 3

[0035] Dissolve 15 parts by weight of unsaturated carboxylic acid monomer 1-methacryloylpyrrolidine-2-carboxylic acid in 60 parts of N,N-dimethylformamide (DMF), 2 parts of diphenyl peroxide Acyl (BPO) is dissolved in 10 parts of interface agent xylene; 100 parts of LLDPE particles and 5 parts of the second graft monomer styrene (St) are placed in a reaction vessel containing 300 parts of water, and stirred to make the LLDPE particles evenly Suspend in water; Add the unsaturated carboxylic acid monomer solution and BPO solution into the reaction vessel through a syringe, stir at 60°C under a nitrogen atmosphere for 1.5h, react at 95°C for 2 hours, then cool, wash, filter, and use methanol and acetone extraction, vacuum drying, the final grafted product can be obtained, and its grafting rate is 11.2%.

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Abstract

The invention provides a method for grafting linear low density polyethylene to a polar monomer. The method includes: dissolving 5-25 parts of an unsaturated carboxylic acid monomer in 60 parts of N, N-dimethyl formamide, and dissolving 2-10 parts of benzoyl peroxide in 10-50 parts of an interface agent dimethylbenzene; placing 100 parts of linear low density polyethylene particles and 5-50 parts of a second grafting monomer styrene in a reaction vessel containing 300 parts of water, conducting stirring to make the linear low density polyethylene particles uniformly suspended in water; adding the unsaturated carboxylic acid monomer solution and the benzoyl peroxide solution into the reaction vessel, stirring them at 60DEG C for 1.5h under a nitrogen atmosphere to perform swelling, raising the temperature to 80-95DEG C to let the materials react for 2-6h, and then carrying out cooling, washing, filtering and drying, thus obtaining the product. The linear low density polyethylene grafted product obtained in the invention contains amino acid residues, thus having good biocompatibility and being able to maintaining the excellent mechanical properties of the linear low density polyethylene raw material.

Description

technical field [0001] The invention relates to a method for grafting and modifying linear low-density polyethylene. Background technique [0002] Linear low-density polyethylene (LLDPE) is a synthetic resin obtained by polymerizing ethylene and higher α-olefins (such as butene-1, hexene-1) under low pressure. It is a low-density polyethylene containing short-chain branches. The product The molecular weight distribution is narrow. In addition to the properties of general polyolefin resins, its tensile strength, tear strength, environmental stress cracking resistance, low temperature resistance, heat resistance and puncture resistance are particularly superior, and are widely used in agricultural films, packaging films, composites, etc. Films, pipes, hollow containers, wires, cable insulation, etc. [0003] Since the molecular chain of linear low-density polyethylene is non-polar, its hydrophilicity, dyeability, gas permeability, antistatic property, compatibility with othe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/02C08F220/58C08F212/08C08F2/01
Inventor 徐晓冬周慧云张立芬范群福邱蕾蕾常秀娟周建
Owner HARBIN ENG UNIV
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