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Polypropylene composition and preparation method thereof

A polypropylene composition and polypropylene technology, applied in the field of polypropylene composition and its preparation, to achieve the effects of cost reduction, high crystallization temperature, and good cost performance

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, above-mentioned method can not fundamentally solve the smell problem that material itself brings

Method used

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  • Polypropylene composition and preparation method thereof
  • Polypropylene composition and preparation method thereof
  • Polypropylene composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0139] 1) Preparation of polypropylene raw material

[0140] A, the preparation of main catalyst:

[0141]After the 16L pressure-resistant reactor with a stirrer was fully replaced with nitrogen, 10L ethanol, 300mL 2‐ethylhexanol, 11.2g iodine, 8g magnesium chloride and 640g magnesium powder were added to the reactor. While stirring, the temperature of the system was raised to 75° C. for reflux reaction until no more hydrogen gas was released. Stop the reaction, wash with 3L of ethanol, filter and dry to obtain dialkoxymagnesium carrier of spherical particles. The resulting dialkoxymagnesium carrier has a D50 of 30.2 μm, a span value of 0.81, and an m value of 0.015. Take 650g of the above-mentioned dialkoxymagnesium carrier, 3250mL of toluene and 65mL of 2-isopropyl-2-isoamyl-1,3-dimethoxypropane to prepare a suspension. In a 16L pressure-resistant reaction kettle that has been repeatedly replaced with high-purity nitrogen, add 2600mL of toluene and 3900mL of titanium tetr...

Embodiment 2

[0157] 1) Preparation of polypropylene raw material

[0158] A. raw material (same as embodiment 1)

[0159] B. Test device (same as embodiment 1)

[0160] C. Test conditions

[0161] Step (1) Pre-polymerization: Reaction pressure is 2.5MPa, reaction temperature is 10°C, reaction time is 12 minutes; main catalyst and triethylaluminum feeding amount are 0.4g / hour and 0.058mol / hour respectively; propylene feeding amount It is 10 kg / hour, and the prepolymerization ratio is 65 grams of polymer / gram of catalyst.

[0162] Step (2) gas phase polymerization: reaction temperature is 91°C, reaction pressure is 2.3MPa, reaction time is 60 minutes; propylene feed rate is 30 kg / hour; hydrogen feed rate is 0.4 g / hour; The propylene molar ratio was 0.008.

[0163] D. Test results

[0164] The continuous test was carried out for 48 hours according to the above conditions, and the operation of the device was stable. The polymer obtained by the reaction was analyzed and tested, and the res...

Embodiment 3

[0171] 1) Preparation of polypropylene raw material

[0172] A. raw material (same as embodiment 1)

[0173] B. Test device (same as embodiment 1)

[0174] C. Test conditions

[0175] Step (1) pre-polymerization: reaction pressure 2.5MPa, reaction temperature 10°C, reaction time 12 minutes; main catalyst, triethylaluminum, dicyclopentyldimethoxysilane DCPDMS (commonly known as D-Donor) feed The amount is 1.1g / hour, 0.051mol / hour, 0.0082mol / hour respectively; Al / Si (mol / mol)=6.2; The feed rate of propylene is 10 kg / hour, and the prepolymerization ratio is 90 grams of polymer / gram of catalyst .

[0176] Step (2) gas phase polymerization: reaction temperature is 98°C, reaction pressure is 2.3MPa, reaction time is 60 minutes; feed rate of propylene is 30 kg / hour; feed rate of hydrogen is 0.6 g / hour; The propylene molar ratio was 0.012.

[0177] D. Test results

[0178] The continuous test was carried out for 48 hours according to the above conditions, and the operation of th...

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Abstract

The invention relates to a polypropylene composition and a preparation method thereof, and particularly relates to a high-strength high-modulus polypropylene composition and a processing preparation method thereof. The polypropylene composition comprises polypropylene, glass fiber, a toughening agent and an antioxidant, wherein the molecular weight distribution index of polypropylene is 2.5-5.5, and the polymer tailing index in molecular weight distribution width is more than 1.9. Polypropylene can achieve a reinforced effect as long as a small amount of glass fiber is added. Compared with polypropylene prepared by a degradation method, the polypropylene composition has the advantages of simple processing, low cost, better cost performance and wider application.

Description

technical field [0001] The invention relates to a polypropylene composition and a preparation method thereof, in particular to a high-strength and high-modulus polypropylene composition and a processing preparation method thereof. Background technique [0002] As an important member of the polyolefin field, polypropylene is the most used plastic material in the world. Derivative products based on polypropylene matrix have a broad market. Reinforced polypropylene materials are rich in raw materials, light in weight, resistant to solvents, and easy to use. With the advantages of excellent processing and comprehensive performance, it has been widely used in many fields such as automobile industry, household appliances, food packaging, building decoration, etc. It is an important part of general-purpose plastic products. However, polypropylene has poor impact strength, large molding shrinkage, and lower surface hardness than other materials, and poor scratch resistance, so its a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K13/04C08K7/14C08L51/06C08L9/06C08K5/526C08K5/134C08K5/372B29C47/92B29C48/92
CPCC08L23/12C08L2314/02C08L51/06C08L9/06C08L13/00C08K7/14C08K5/1345C08K5/526C08K13/04C08K5/372
Inventor 邵静波张师军王良诗徐萌吕芸董穆邹浩李杰张丽英胡慧杰刘建叶初立秋权慧
Owner CHINA PETROLEUM & CHEM CORP
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