Industrial production method of multicomponent copolymer chlorinated polyethylene by water phase grafting

A technology of co-polymerizing chlorinated polyethylene and its production method, which is applied in the field of polymer chemical industry, and achieves the effects of low cost, easy operation and considerable economic benefits

Inactive Publication Date: 2009-07-08
汪立波
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  • Application Information

AI Technical Summary

Problems solved by technology

The industrialized production method of multi-component copolymerized chlorinated polyethylene does not cause pollution to the surrounding environment

Method used

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Experimental program
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Embodiment

[0011] Add 1500Kg of clean water to a 2000-liter glass-lined reactor with stirring; crush and sieve to reach a particle size of 60-120 mesh, 70Kg of high-pressure low-density polyethylene, 600g of emulsification accelerator, 2Kg of dispersion and isolation agent, and 600g of activation initiator. Under stirring, gradually raise the temperature to 90-100°C and keep it warm for 0.5-1 hour, so that carboxyl groups, hydroxyl groups, ester groups and carbonyl groups are connected to the polyethylene molecular chains, and when the temperature is lowered to 60°C, chlorine gas is introduced. Before the temperature reaches 88°C, the amount of chlorine gas must reach 60% of the total amount, and then continue to heat up to 110°C, and the amount of chlorine gas must reach 95%; the last 5% chlorine gas must be at 100-120°C The total input amount of chlorine gas is 330Kg, the whole process of chlorination reaction is 3 hours and 20 minutes, and the chlorination reaction is over; first keep ...

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PUM

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Abstract

The invention relates to an industrialized production method for producing multielement copolymerization chlorinated polyethylene through water phase grafting. The method comprises the following steps: taking polyethylene powder as the raw material, and adding the raw material into an aqueous solution containing an emulsification promoter, a dispersion separation agent and an activation initiator; making the polyethylene powder be in a suspended state under the action of stirring, and linking up functional groups with the molecular chain of polyethylene before chlorine is introduced to have a chlorination reaction. The method comprises the following key points: the functional groups can be four functional groups, namely a carboxyl functional group, a hydroxyl functional group, an ester functional group and a carbonyl functional group, and the number of the grafted functional groups can be 15 to 25 percent of the weight of polyethylene; then a certain proportion of chlorine is respectively introduced through three temperature sections, and the chlorination reaction is carried out in the same glass lining reaction kettle so as to finally obtain the multielement copolymerization chlorinated polyethylene with the chlorine content of 70 to 80 percent; and the raw material of polyethylene has the molecular weight of 3,000 to 5,000. The method causes no pollution on the ambient surroundings, and has the short reaction time and convenient operation. The method is suitable for the large-scale production, and has lower cost and great economic benefits.

Description

technical field [0001] The invention relates to the field of macromolecule chemical industry, and is an industrialized production method for producing multi-component copolymerized chlorinated polyethylene after grafting in a water phase suspension state. Background technique [0002] Multi-component copolymerized chlorinated polyethylene (HPHCPE) is mainly used for coatings, inks, flame retardants, high-grade adhesives, etc. Its manufacture method, at present well-known solid phase chlorination method, solvent chlorination method and aqueous phase suspension chlorination method. Since solid-phase chlorination is to pass chlorine gas directly into polyethylene powder, the specific surface area of ​​contact between polyethylene and chlorine molecules is limited, so it is difficult to realize in large-scale production, so it is generally not used in industry. Usually, the solvent method is used for chlorination in industry, but because of the high production cost, and some so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/22C08F255/02
Inventor 汪立波
Owner 汪立波
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