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Method for increasing polyolefin grafting efficiency

A technology of grafting efficiency and polyolefin, which is applied in the field of polyolefin modification, can solve the problems of low efficiency and low grafting efficiency of graft copolymers, so as to reduce crosslinking or degradation, improve initiation efficiency and polyolefin grafting Efficiency, the effect of preventing excessive local free radical concentration

Inactive Publication Date: 2016-08-17
ENERGY RES INST OF SHANDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since all the initiators are added to the extruder at one time through the extruder hopper, there will be too many free radicals generated by the decomposition of the initiator in the initial stage of the extrusion reaction. These free radicals will not only form on the polyolefin chain segment In addition to the main reaction of grafting of polar monomers triggered by grafting points, too many grafting points will also cause many side reactions (such as polyethylene crosslinking or polypropylene degradation side reactions), which will be significant Reduce the efficiency of peroxygen compounds initiating the grafting of polar monomers to polyolefins, so the grafting efficiency of the graft copolymers described in the above-mentioned patents and documents is not high, all less than 1.5%

Method used

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  • Method for increasing polyolefin grafting efficiency
  • Method for increasing polyolefin grafting efficiency
  • Method for increasing polyolefin grafting efficiency

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: comparative example

[0034] Take by weighing 93.9 parts of low-density polyethylene (parts by weight, the same below), 5.0 parts of maleic anhydride, 0.1 part of initiator 1 dibenzoyl peroxide, and 1.0 part of antioxidant 1010, and dissolve maleic anhydride in 5.0 parts without In water ethanol, dissolve dibenzoyl peroxide in 5.0 parts of absolute ethanol, mix low-density polyethylene, dibenzoyl peroxide solution, maleic anhydride solution, and antioxidant 1010 in a high-speed mixer , put the above mixture into the hopper of the extruder, the temperature of each zone of the extruder is between 140°C and 190°C, the speed of the main screw is 70 rpm, the speed of the feeding screw is 60 rpm, and the extruded product is drawn, cooled, drying and pelletizing to obtain polar monomer graft modified polyolefin particles.

Embodiment 2

[0036] Take by weighing 93.9 parts of low-density polyethylene (parts by weight, the same below), 5.0 parts of maleic anhydride, 0.1 part of initiator 1 dibenzoyl peroxide, and 1.0 part of antioxidant 1010, and dissolve maleic anhydride in 5.0 parts without In water ethanol, dissolve dibenzoyl peroxide in 5.0 parts of absolute ethanol, mix low-density polyethylene, maleic anhydride solution, and antioxidant 1010 in a high-speed mixer, and add the above mixture to the extruder In the hopper, the temperature of each zone of the extruder is between 140°C and 190°C, the speed of the main screw is 70 rpm, and the speed of the feeding screw is 60 rpm, and the dibenzoyl peroxide solution is pumped into the extruder I and Zone II, the pumping speeds are 1 part / minute and 0.8 part / minute respectively, and the extruded product is drawn, cooled, dried and pelletized to obtain polar monomer grafted modified polyolefin particles.

Embodiment 3

[0038] Take by weighing 93.9 parts of low-density polyethylene (parts by weight, the same below), 5.0 parts of maleic anhydride, 0.1 part of initiator 1 dibenzoyl peroxide, and 1.0 part of antioxidant 1010, and dissolve maleic anhydride in 5.0 parts without In water ethanol, dissolve dibenzoyl peroxide in 5.0 parts of absolute ethanol, mix low-density polyethylene, maleic anhydride solution, and antioxidant 1010 in a high-speed mixer, and add the above mixture to the extruder In the hopper, the temperature of each zone of the extruder is between 140°C and 190°C, the speed of the main screw is 70 rpm, and the speed of the feeding screw is 60 rpm, and the dibenzoyl peroxide solution is pumped into the extruder I , II, and III areas, the pumping speed is 1 part / min, 0.8 part / min, 0.6 part / min respectively, and the extrudate is drawn, cooled, dried, and pelletized to obtain a polar monomer graft-modified polymer Olefin pellets.

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Abstract

The invention relates to a method for increasing polyolefin grafting efficiency. The method comprises the steps of weighing the raw materials in parts by weight: 99.88-83.0 parts of polyolefin, 0.1-12.0 parts of polar monomer, 0.01-3.0 parts of initiator and 0.01-2.0 parts of antioxidant, dissolving the polar monomer in a solvent, dissolving the initiator in anhydrous ethanol, uniformly mixing the polyolefin, the antioxidant and the solution of the polar monomer in a high-speed mixer, adding the mixture into a hopper of an extruder after the solvent of the polar monomer is volatilized, pumping the anhydrous ethanol solution of the initiator into different heating sections of the extruder according to different speeds, and subjecting extrudate to drawing, cooling, drying and granulating, thereby obtaining polar monomer grafted modified polyolefin granules. According to the method, the number of local free radicals is effectively prevented from being too high, the occurrence of side reactions such as polyolefin bridging or degrading is remarkably lowered, and the polyolefin grafting efficiency is greatly increased.

Description

technical field [0001] The invention relates to a method for modifying polyolefin, in particular to a method for improving grafting efficiency of polyolefin. Background technique [0002] Polyolefin is a kind of general-purpose plastic with the largest output. It has excellent electrical insulation, water repellency, chemical solvent corrosion resistance, low temperature and ductility. At the same time, it has low cost and good processing performance. It mainly includes low-density polyethylene, High density polyethylene, linear low density polyethylene, polypropylene, ethylene propylene copolymer, ethylene octene copolymer, etc. However, polyolefins are non-polar materials, and their dyeability and adhesion are poor, and their compatibility with other polar polymers is poor. These shortcomings restrict their application in many fields. [0003] Introducing polar groups, such as carboxyl groups, acid anhydrides, hydroxyl groups, epoxy groups, ester groups, etc., into the po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/02C08F222/06B29B9/06B29C47/10
CPCC08F255/02B29B9/06B29C48/29B29C48/297C08F222/06
Inventor 蒋波蔡飞鹏杨改王波
Owner ENERGY RES INST OF SHANDONG ACAD OF SCI
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