Processing agent for polyolefin and alloy thereof, preparation method and application thereof

Abstract

The invention provides a processing agent for polyolefin and alloy thereof, comprising the following blended components: oligomer and polyprotic acid, wherein the molar ratio of the oligomer to the polyprotic acid is from 1:0.1 to 1:10; the oligomer is linear or short branched chain oligomer, of which the molecular weight is from 2000 to 20000, and two ends or one end of the oligomer is provided with polar end groups or a polar end group; and the polyprotic acid is organic polyprotic acid or inorganic polyprotic acid. The processing agent has the advantages of small volume of addition, short effective time, favorable viscosity effect and the like when used in the polyolefin and the alloy thereof. By adopting an acid modifying method of acid modification, the heat resistance of the oligomer is improved so that the decomposition problem is not existed under the normal processing temperature and the product can not fade.

Description

technical field [0001] The invention relates to a processing aid for polyolefin and its alloy, its preparation method and application. technical background [0002] With the development of my country's manufacturing industry, the demand for polyolefins is increasing year by year. In 2007, the national consumption of polyolefins reached 20 million tons. With the advancement of catalysts and polymerization processes, some high-performance polyolefins, such as metallocene polyolefins, ultra-high molecular weight polyethylene, and polybutene, have been able to achieve large-scale industrial production, but due to the poor processability of these polyolefins, limit their large-scale application. [0003] Under the existing technical conditions, the use of processing aids is the best solution to these problems. Processing aids are a general term for several types of materials used to improve the processing and handling properties of high molecular weight polymers, mainly in the ...

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Problems solved by technology

However, this processing aid has the disadvantages of long onset time, fluorine decomposition pollution, difficult cleaning, high cost, etc.

[0005] U.S. Patent US5015693 provides a processing aid compounded with polyethylene glycol and fluorine-containing rubber, which can increase the critical shear rate of the extrudate, but the processing aid also has the disadvantages of fluorine decomposition pollution, difficulty in cleaning, and high cost.

[0006] Chinese patent CN03135482 provides a processing aid compounded with polyethylene glycol and inorganic particles, which has a good effect on assisting the processing of polyolefins, but the aid will be decomposed due to the decomposition of polyethylene glycol at the processing temperature problem, resulting in discoloration of the final product

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