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

A technology of polypropylene and propylene, which is applied in the field of polypropylene preparation and can solve problems such as high VOC content, relatively large impact on material properties, and re-release

Active Publication Date: 2018-08-17
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 odor and low VOC content
  • A kind of preparation method of impact-resistant polypropylene with low odor and low VOC content
  • A kind of preparation method of impact-resistant polypropylene with low odor and low VOC content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 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.

[0058] Polymerization method and steps are as follows:

[0059] (1) Pre-complexation reaction

[0060] Main catalyst (DQC-401 catalyst, provided by Beijing Aoda Branch of Sinopec Catalyst Company, Ti content: 2.5wt%, Mg content: 18.0wt%, di-n-butyl phthalate content: 12.8wt%) flow rate is 0.6g / hr, the cocatalyst (triethylaluminum, TEA) flow rate is 6.33g / hr, the first external electron donor (2,2-diisobutyl-1,3-dimethoxypropane, DIBMP) flow rate is 0.60g / hr, TEA / DIBMP ratio of 50 (mol / mol), pre-complexation reaction at 6°C for 8min.

[0061] (2) Prepolymerization reaction

[0062] The pre-complexed catalyst system is continuously added to the continuous stirred tank pre-polymerization reactor, and the pre-po...

Embodiment 2

[0070] 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 DIBMP of the first external electron donor is reduced, and the TEA / DIBMP 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

[0072] 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 DIBMP is changed to 2-isopropyl-2-isopentyl-1,3-dimethoxypropane (IPBMP), and TEA / IPBMP 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 anti-shocking polypropylene with low odor and low VOC content. The method comprises the following steps: in the presence of a Ziegler-natta catalyst containing a first external electron donor, and hydrogen, performing propylene homopolymerization, thereby obtaining a material flow 1 containing a homopolymerization polymer A and the catalyst; in the propylene copolymerization period, performing polymerization reaction on propylene and alpha-olefin in the presence of the material flow 1 and a second external electron donor, thereby obtaining a material flow 2 containing the homopolymerization polymer A and a copolymerization polymer B, wherein the first external electron donor is a 1,3-diether compound; the second external electron donor is alkoxysilane. By adoption of the method, an anti-shocking polypropylene product with narrow molecular weight distribution, ultralow molecular weight component content, low odor and low VOC content can be produced without using a special catalyst or greatly changing a conventional process device.

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 odor and 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 applianc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F110/06C08F210/06C08F210/16C08F4/649C08F4/646C08L23/12C08L23/14C08L23/16
Inventor 宋文波毕福勇郭梅芳张师军胡慧杰邹发生
Owner CHINA PETROLEUM & CHEM CORP
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