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A kind of preparation method of impact-resistant polypropylene with low VOC content

A polypropylene and propylene technology, applied in the field of preparation of low VOC content impact polypropylene, can solve the problems of increased cost, high VOC content, and relatively large impact on material properties.

Active Publication Date: 2019-03-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above methods are all completed in the processing stage, whether physical adsorption or chemical reaction, have played a role in reducing the VOC content of polypropylene, but the ultra-low molecular weight components or hydrocarbon compounds existing in polypropylene matrix materials have not fundamentally Remove, and these are the root causes of sample odor and high VOC content
In addition, whether it is the use of adsorbents, chemical reagents or vacuum devices, it is bound to increase the cost
In addition, whether it is a physical method, a chemical method or a physical-chemical method has its own limitations, the substances adsorbed by the physical adsorption method still exist in the system, and there is a risk of re-release under the effects of long-term heat aging and photoaging; The chemical method is relatively targeted, generally only for one factor, and cannot solve the sporadic problems caused by various factors at the same time; the physical-chemical method requires the use of various additives, which has a greater impact on the performance of the material

Method used

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  • A kind of preparation method of impact-resistant polypropylene with low VOC content
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The propylene polymerization reaction is carried out on a set of 25Kg / hr propylene polymerization device, which mainly includes a pre-complexation reactor, a pre-polymerization reactor, a first loop reactor, a second loop reactor and a third gas phase reactor.

[0056] Polymerization method and steps are as follows:

[0057] (1) Pre-complexation reaction

[0058] The main catalyst (DQC-602 catalyst, provided by Beijing Aoda Branch of Sinopec Catalyst Company, Ti content: 2.4wt%, Mg content: 18.0wt%, di-n-butyl phthalate content: 13.0wt%) flow rate is 0.8g / hr, the cocatalyst (triethylaluminum, TEA) flow rate is 6.33g / hr, the first external electron donor (3-aminopropyltriethoxysilane, KHTES) flow rate is 0.60g / hr, TEA / The KHTES ratio was 50 (mol / mol), and the pre-complexation reaction was performed at 6° C. for 8 minutes.

[0059] (2) Prepolymerization reaction

[0060] The pre-complexed catalyst system is continuously added to the continuous stirred tank pre-polyme...

Embodiment 2

[0068] The catalyst used in embodiment 2, pre-complexation and polymerization process conditions are identical with embodiment 1. The difference from Example 1 is that the amount of the first external electron donor KHTES is increased, and TEA / KHTES is changed to 40 (mol / mol). The specific process parameters of this embodiment and the performance test results of the obtained polymer are listed in Table 1 and Table 2.

Embodiment 3

[0070] The catalyst used in embodiment 3, pre-complexation and polymerization process conditions are identical with embodiment 1. The difference from Example 1 is that the first external electron donor KHTES is changed to diethylaminotriethoxysilane (BEATES), and TEA / BEATES is changed to 30 (mol / mol). The specific process parameters of this embodiment and the performance test results of the obtained polymer are listed in Table 1 and Table 2.

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Abstract

The invention provides a method for preparing impact-resistant polypropylene with low VOC (Volatile Organic Compounds) content. The method comprises a propylene homopolymerization stage and a propylene copolymerization stage, wherein at the propylene homopolymerization stage, a propylene homopolymerization reaction is carried out in the presence of a Ziegler-Natta catalyst containing a first external electron donor and hydrogen gas so as to obtain a material flow 1 containing a homopolymerized polymer A and the catalyst, and at the propylene copolymerization stage, a propylene and alpha-olefin copolymerization reaction is carried out in the presence of the material flow 1 and a second external electron donor so as to obtain a polypropylene flow 2 containing the homopolymerized polymer A and a copolymerized polymer B; and the first external electron donor is trialkoxysilane, and the second external electron donor dialkoxysilane. According to the method, impact-resistant polypropylene products with narrow molecular-weight distribution, low ultralow-molecular-weight component content, light odor and low VOC content can be produced without special catalysts and great change on the existing processing equipment.

Description

technical field [0001] The invention relates to a method for preparing polypropylene, in particular to a method for preparing impact-resistant polypropylene with low VOC content. Background technique [0002] Polypropylene includes homopolypropylene, copolymerized polypropylene, grafted polypropylene and impact-resistant polypropylene. It has excellent comprehensive properties and is widely used in automobiles, household appliances, construction, sanitary products, chemical materials, packaging products and other fields. However, polypropylene materials are different from metal materials. In the process of synthesis, processing and use, small molecular weight and volatile organic substances are precipitated, that is, VOC (volatile organic compounds) are separated out, and at the same time they emit peculiar smell. In closed spaces, food and drug appliances, etc. The use in special fields is limited, especially in automotive interior materials, household appliances, etc., and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F110/06C08F210/06C08F210/16C08F4/646C08L23/12C08L23/14C08L23/16
Inventor 毕福勇宋文波郭梅芳张师军胡慧杰邹发生
Owner CHINA PETROLEUM & CHEM CORP
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