Ultrahigh-molecular-weight atactic polypropylene resin capable of being used for 3D printing, and preparation method and application thereof

An ultra-high molecular weight, random polypropylene technology, applied in the field of ultra-high molecular weight random polypropylene resin and its preparation, can solve the problems of high energy consumption, application limitation, poor melt fluidity, etc., and achieve the effect of low energy consumption

Active Publication Date: 2014-08-13
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For ultra-high molecular weight polymers, due to their poor melt fluidity, screw extrusion and granulation steps require high energy

Method used

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  • Ultrahigh-molecular-weight atactic polypropylene resin capable of being used for 3D printing, and preparation method and application thereof
  • Ultrahigh-molecular-weight atactic polypropylene resin capable of being used for 3D printing, and preparation method and application thereof

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preparation example Construction

[0076] 1. Preparation of supported metallocene catalysts

[0077] The supported metallocene catalyst used in the present invention is selected from SiO 2 A metallocene catalyst as a carrier, characterized in that the particle size of the catalyst particles is 0.1 to 30 μm, prepared by the following method:

[0078] Take 5.0g of SiO 2 The carrier (particle size 1-30 μm) was placed in a two-neck flask filled with argon and mechanically stirred, then 30 mL of toluene solution was added, the temperature was lowered to 0 °C, 20 mL of MAO solution (concentration was 1.4 mol / L) was slowly added, and continued After stirring the reaction for 12h, add 3.7g metallocene compound (C 2 h 4 ) 2 Flu(2-CH 3 -5,6-Cyclopentyl-Ind)Hf(CH 3 ) 2 , Continue to stir the reaction for 3h. The reaction product was washed three times with toluene and hexane respectively, and dried in vacuum to obtain a supported metallocene catalyst A. The particle diameter of the catalyst is 1-30 μm.

[0079] ...

Embodiment 1

[0088] Add 200g liquid propylene, 0.2ml (CPh 3 )[B(C 6 f 5 ) 4 ] (concentration is 1.0mol / L) and 100mg above-mentioned prepared catalyst A, carry out polymerization at 0 ℃, after reacting for 30 minutes, vent the residual gas in the polymerization reactor, collect the polymerization product, obtain 35g white ultrahigh molecular weight after drying Atactic polypropylene resin powder.

[0089] The molecular weight of the obtained polypropylene resin is 4.90×10 6 g / mol, [mmmm] content is 17%, and the particle size of polymer particles is 100-400 μm.

Embodiment 2

[0091] Add 300g liquid propylene, 0.2ml (CPh 3 )[B(C 6 f 5 ) 4 ] (concentration is 1.0mol / L) and 100mg above-mentioned catalyst A of preparation, carry out polymerization at 20 ℃, after reacting for 30 minutes, empty the residual gas in the polymerization reactor, collect polymerization product, obtain 140g white ultrahigh molecular weight after drying Atactic polypropylene resin powder.

[0092] The molecular weight of the obtained polypropylene resin is 1.60×10 6 g / mol, the [mmmm] content is 24%, and the particle size of the polymer particles is 200-600 μm.

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Abstract

The invention discloses an ultrahigh-molecular-weight atactic polypropylene resin capable of being used for 3D printing, and a preparation method and an application thereof. The molecular weight of the ultrahigh-molecular-weight atactic polypropylene resin is 9*10<5>-5*10<6> g/mol, and the isotacticity (according to the percentage of a propylene unit isotactic sequence pentad [mmmm] in a polypropylene molecular chain) is 15-80%. The ultrahigh-molecular-weight atactic polypropylene resin is obtained by polymerization of propylene, the polymerized product is granular in shape, and the particle diameter is 50-1000 [mu]m. Because the resin has small and uniform particle morphology, the resin can be directly used as a raw material of 3D printing by adding a heat stabilizer, and is especially suitable for high-flexibility and high-ductility products molded by 3D printing.

Description

technical field [0001] The invention relates to an ultra-high molecular weight random polypropylene resin that can be used for 3D printing and its preparation method and application, in particular to an ultra-high molecular weight random polypropylene resin that can be used for 3D printing and which is directly prepared in a polymerization kettle. Its preparation method and application. Background technique [0002] Atactic polypropylene has the characteristics of low density, easy processing, and good flexibility, which can improve the brittleness of isotactic polypropylene. The molecular weight of random polypropylene prepared by traditional methods is usually below 1 million. Due to the nature of the linear structure of its molecular chain, it can be shaped or applied by thermal processing. Ultra-high molecular weight random polypropylene refers to random polypropylene with a molecular weight of one million and a linear structure, and the content of isotactic sequences i...

Claims

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Application Information

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IPC IPC(8): C08F110/06C08F4/6592C08F4/02C08L23/12B29C67/00
Inventor 董金勇牛慧秦亚伟王宁李春成符文鑫林学春马永梅孙文华徐坚
Owner INST OF CHEM CHINESE ACAD OF SCI
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