High-melt-index polypropylene and preparation process thereof

A technology of polypropylene and high melting index, applied in the chemical industry, can solve the problems of uneven dispersion, insufficient reaction, interference of other components, etc., and achieve the effects of low melting temperature, avoiding reaction imbalance and high melting index

Pending Publication Date: 2020-10-30
CHANGZHOU TIANWANG PLASTIC IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polypropylene is a polymer formed by the addition polymerization of propylene. Its normal state is a colorless, odorless, non-toxic, translucent solid. Polypropylene has excellent comprehensive properties and has been widely developed and applied in various fields. According to Different application scenarios have different requirements on the processing performance of polypropylene. For example, some production requires polypropylene to have good melt flow properties. This performance is based on the melt flow index, which is called melt flow index or melt flow index. Melt index, referred to as melt index, is the weight value of the thermoplastic melt passing through the standard capillary within ten minutes at a certain temperature and pressure, expressed in (g/10min), an

Method used

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  • High-melt-index polypropylene and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Mix 73.3 parts of polypropylene with molecular sieves, stir evenly, and knead at 160°C for 7 minutes to obtain product A; take 0.8 parts of plasticizer, add 0.05 parts of erucamide and 10 parts of polyethylene wax and mix evenly. For bis (2-ethylhexyl) phthalate, mixture B is obtained;

[0037] Take the product A and put it in the reaction kettle and seal it, add the mixture B and mix evenly, add 0.15 parts of organic peroxide and stir evenly, the organic peroxide is di-tert-butyl peroxide, heat to 170°C, and stir at a speed of 180r / min 30min;

[0038] Add 0.3 part of polymerization inhibitor, 0.1 part of antioxidant and shear at 600r / min for 45min. The polymerization inhibitor is p-hydroxyanisole, and the antioxidant is dibutyl hydroxytoluene and 2-tert-butyl p-phenyl Diphenol, and irradiated, the irradiation dose is 30kGy;

[0039] Add 0.001 part of stearate-dibasic acid complex and mix evenly. The stearate in the stearate-dibasic acid compound is zinc stearate, and...

Embodiment 2

[0041] Mix 80.94 parts of polypropylene with molecular sieves, stir evenly, and knead at 165°C for 11 minutes to obtain product A; take 1.4 parts of plasticizer, add 0.17 parts of erucamide and 15 parts of polyethylene wax and mix evenly. For dibutyl phthalate, mixture B is obtained;

[0042]Take the product A and put it in the reaction kettle and seal it, add the mixture B and mix evenly, add 1.5 parts of organic peroxide and stir evenly, the organic peroxide is dicumyl peroxide, heat to 185°C, and stir at a speed of 210r / min 45min;

[0043] Add 0.4 part of polymerization inhibitor, 0.4 part of antioxidant and shear 52min under the rotating speed of 750r / min, polymerization inhibitor is p-methoxyphenol, antioxidant is dibutyl hydroxytoluene and 2-tert-butyl p-phenyl Diphenol, and irradiated, the irradiation dose is 35kGy;

[0044] Add 0.003 parts of stearate-dibasic acid complex and mix evenly. The stearate in the stearate-dibasic acid compound is calcium stearate, and the ...

Embodiment 3

[0046] Mix 88.58 parts of polypropylene with molecular sieves, stir evenly, and knead at 170°C for 15 minutes to obtain product A; take 2 parts of plasticizer, add 0.3 parts of erucamide and 20 parts of polyethylene wax and mix evenly. For bis (2-ethylhexyl) phthalate, mixture B is obtained;

[0047] Take the product A and put it in the reaction kettle and seal it, add the mixture B and mix evenly, add 3 parts of organic peroxide and stir evenly, the organic peroxide is 2,5-dimethyl-2,5-bis(tert-butyl peroxy base) hexane, heated to 200°C, and stirred at a speed of 240r / min for 60min;

[0048] Add 0.5 parts of polymerization inhibitor, 0.8 parts of antioxidant and shear at 900r / min for 60min. The polymerization inhibitor is 2,5-di-tert-butylhydroquinone, and the antioxidant is dibutylhydroxytoluene and 2-tert-butylhydroquinone, and irradiated, the irradiation dose is 40kGy;

[0049] Add 0.005 parts of stearate-dibasic acid complex and mix evenly. The stearate in the stearate-...

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Abstract

The invention discloses high-melt-index polypropylene and a preparation process thereof. The high-melt-index polypropylene is prepared from the following components in parts by weight: 73.3 to 88.58 parts of isotactic polypropylene, 0.8 to 2 parts of a plasticizer, 0.15 to 3 parts of an organic peroxide, 0.05 to 0.3 part of erucyl amide, 10 to 20 parts of polyethylene wax, 0.3 to 0.5 part of a polymerization inhibitor, 0.1 to 0.8 part of an antioxidant and 0.001 to 0.005 part of a stearate-binary acid compound. According to the invention, material components are selected and process steps andparameters are set, so that the raw materials are always changed in the degradation direction, the local bond breaking or cross-linking phenomenon caused by the unbalanced reaction of the raw materials is avoided, and the final finished product polypropylene has characteristics of uniform molecular weight, uniform molecular weight distribution, high fluidity and low melting temperature so as to achieve the high melt index, and is suitable for wide promotion and use.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a high melting index polypropylene and a preparation process thereof. Background technique [0002] Polypropylene is a polymer formed by the addition polymerization of propylene. Its normal state is a colorless, odorless, non-toxic, translucent solid. Polypropylene has excellent comprehensive properties and has been widely developed and applied in various fields. According to Different application scenarios have different requirements on the processing performance of polypropylene. For example, some production requires polypropylene to have good melt flow properties. This performance is based on the melt flow index, which is called melt flow index or melt flow index. Melt index, referred to as melt index, is the weight value of the thermoplastic melt passing through the standard capillary within ten minutes at a certain temperature and pressure, expressed in (g / 10min), and used t...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L23/06C08K13/04C08K7/26C08K5/20C08K5/098C08K5/12C08K5/14C08K5/13C08K5/092
CPCC08L23/12C08L2207/10C08L2205/02C08L23/06C08K13/04C08K7/26C08K5/20C08K5/098C08K5/12C08K5/14C08K5/13C08K5/092
Inventor 吴建国史良吴建锋
Owner CHANGZHOU TIANWANG PLASTIC IND CO LTD
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