Halogen-containing branched polyethylene and preparation method thereof

A branched polyethylene, branched degree technology, applied in coatings, adhesives, etc., can solve the problems of no practical value, low polymerization activity, and high synthesis cost, and achieve the effects of easy industrialization, low halogen content, and low cost.

Active Publication Date: 2020-01-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The first method requires the use of noble metal palladium, the polymerization activity is very low, the synthesis cost is too high, and the polar groups are all at the end of the branch chain
The second method also uses the precious metal palladium, which has no practical value, and this method can only introduce chlorine atoms at the end of the chain of HBPE, and other polymer chains can only be introduced into HBPE through atom transfer radical polymerization and other methods.

Method used

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  • Halogen-containing branched polyethylene and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The number of branched polyethylene used in this example is PER-3.

[0049] The preparation steps are as follows: add 20 milliliters of CCl in a 100 milliliter three-neck flask 4 , 1 g of branched polyethylene cut into small pieces was added with stirring. Nitrogen was passed through the reaction system for 5 minutes, and the air in the system was exhausted, so that it was in a nitrogen atmosphere. Turn off the nitrogen, pass condensed water, and start to heat up to 80°C. Dissolve 0.1 g of initiator azobisisobutyronitrile in 100 ml of CCl 4 , configured as a solution. After the branched polyethylene is completely dissolved, 10 ml of AIBN in CCl 4 The solution was evenly injected into the reaction system with a syringe, and stirred at 300 rpm for about 10 minutes. Open nitrogen, quickly add 0.1 g of N-bromosuccinimide powder into the system, and add 5 ml of CCl 4 Rinse off the NBS powder adhering to the vessel wall, and immediately reseal the system. Timed and rea...

Embodiment 2

[0051] The consumption of NBS is changed into 0.15 gram, other conditions and operation method are with embodiment 1. The obtained brominated branched polyethylene has a bromine content of 2.5 wt%, and a Mooney viscosity ML(1+4) of 26 at 125°C.

Embodiment 3

[0053] Change the consumption of NBS into 0.2 gram, other conditions and operation method are with embodiment 1. The obtained brominated branched polyethylene has a bromine content of 3 wt%, and a Mooney viscosity ML(1+4) of 28 at 125°C.

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Abstract

The invention relates to the technical field of polyolefin functionalization, and aims to provide halogen-containing branched polyethylene and a preparation method thereof. The halogen-containing branched polyethylene contains a halogen group and is obtained by modifying an ethylene homopolymer with the branching degree not lower than 42 branched chains / 1000 carbon atoms by using a halogen-containing modifier. The halogen in the halogen group is one or more of fluorine, chlorine and bromine. Compared with the prior art, the halogen-free flame-retardant polyolefin material is a novel polyolefinmaterial and has elasticity in a wider halogen content range; due to the lower halogenation degree, the crystal structure of the branched polyethylene with lower branching degree is effectively broken, so that the branched polyethylene has elasticity; the processing and application methods of the branched polyethylene can be enriched, and the branched polyethylene can be used as an elastomer material, a sealing material, a binder, a coating and the like; particularly, when the method is applied to branched polyethylene with low branching degree and high molecular weight, the branched polyethylene with low halogen content and high physical and mechanical properties can be obtained. And the adopted halogenation method is easy to operate and low in cost, and industrialization is easy to achieve.

Description

technical field [0001] The invention belongs to the technical field of polyolefin functionalization, and in particular relates to a halogen-containing branched polyethylene and a preparation method thereof. Background technique [0002] Polyethylene (PE) is the variety with the largest output among general-purpose synthetic resins. It has high cost performance and is widely used in various fields such as industry and agriculture, medical and health care, scientific research and daily life. Polyethylene mainly includes high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE) and some products with special properties. In 1995, the combination of (α-diimine) nickel / palladium late transition metal catalyst and MAO, discovered by Brookhart et al. in 1995, catalyzed the homopolymerization of ethylene. Depending on the ligand structure and polymerization conditions, branched polyethylene with different microstructures and propertie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/22C08F8/20C08F110/02C09D123/28C08L23/28C09J123/28
CPCC08F8/20C08F8/22C08L23/286C09D123/286C09J123/286C08F110/02
Inventor 傅智盛范志强
Owner ZHEJIANG UNIV
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