A kind of high tactic polypropylene alloy and preparation method thereof

A polypropylene, high gauge technology, applied in the field of polypropylene/polyolefin copolymer elastomer alloy materials, can solve the problems of poor low temperature mechanical properties, large molding shrinkage, poor thermal creep resistance, etc., to achieve high strength, toughness, excellent The effect of elasticity and good strength

Active Publication Date: 2021-12-31
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the purposes of the present invention is to provide a new type of high-isotactic polypropylene alloy material that can improve the above-mentioned defects of polypropylene in view of the current performance defects of polypropylene such as poor low-temperature mechanical properties, large molding shrinkage, easy aging, and poor thermal creep resistance.

Method used

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  • A kind of high tactic polypropylene alloy and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1L fully-sealed magnetic stirring stainless steel pressure polymerization kettle, pumped and replaced with high-purity nitrogen for several times, then metered and added liquid phase propylene 0.5Kg, triethylaluminum (Al), external electron donor diphenyl diphenyl Methoxysilane (Si) and MgCl 2 Loaded TiCl 4 Catalyst (Ti content 2.5wt%) 0.25g, wherein Al / Ti=60 (molar ratio), Al / Si=6 (molar ratio). Stir and polymerize at 30°C for 5h, then lower the temperature and empty the propylene, add 0.25Kg of butene and 0.05Kg of hexene into the reactor, react at 20°C for 1h, and obtain 462g of powdery polymer directly after the drying is terminated. The properties of the alloy are shown in Table 1.

Embodiment 2

[0048] 1L fully-sealed magnetic stirring stainless steel pressure polymerization kettle, pumped and replaced several times with high-purity nitrogen, then metered and added triethylaluminum (Al), external electron donor cyclohexyltrimethoxysilane (Si) and MgCl 2 Loaded TiCl 4 Catalyst (Ti content: 2.5wt%) 0.25g, 0.5Kg of gas-phase propylene is fed continuously, wherein Al / Ti=80 (molar ratio), Al / Si=10 (molar ratio). Stir and polymerize at 30°C for 5h, then lower the temperature and empty the propylene, add 0.25Kg of butene and 0.05Kg of octene into the reactor, react at 30°C for 5h, and obtain 478g of powdery polymer directly after the drying is terminated. The properties of the alloy are shown in Table 1.

Embodiment 3

[0050] 1L full-sealed magnetic stirring stainless steel pressure polymerization kettle, pumped out and replaced with high-purity nitrogen for several times, then metered 0.4Kg of propylene, triethylaluminum (Al), and external electron donor diphenyl dimethoxy into the reaction kettle Silane (Si) and MgCl 2 Loaded TiCl 4 Catalyst (Ti content 2.5wt%) 0.25g, wherein Al / Ti=120 (molar ratio), Al / Si=10 (molar ratio). Stir and polymerize at 50°C for 1 hour, then lower the temperature and empty the propylene, add 0.25Kg of butene and 0.08Kg of decene into the reactor, react at 40°C for 5 hours, and obtain 388g of powdery polymer directly after drying. The properties of the alloy are shown in Table 1.

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Abstract

The invention discloses a high isotactic polypropylene alloy and a preparation method thereof. In the high isotactic polypropylene alloy of the invention, the mass content of isotactic polypropylene is 60% to 98%, and the mass content of polyolefin copolymerized elastomer is 1 % to 35%, and the mass content of random polypropylene is 1% to 5%. High isotactic polypropylene alloys are prepared by a two-step process: the first step uses Ziegler‑Natta catalyst to catalyze propylene slurry or gas phase or liquid phase bulk polymerization to prepare high isotactic polypropylene, and the second step continues to carry out butene and Gas phase copolymerization of other higher olefins to prepare high isotactic polypropylene alloys.

Description

technical field [0001] The invention belongs to the technical field of novel polyolefin materials, and in particular relates to a preparation method of a high-isotactic polypropylene alloy and a polypropylene / polyolefin copolymerized elastomer alloy material prepared by the method. Background technique [0002] Polypropylene has the advantages of light weight, high strength and modulus, insoluble in common solvents at room temperature, chemical corrosion resistance, non-toxic and recyclable, and no environmental pollution. It is widely used in automobiles, home appliances, construction, packaging and agriculture. , of which more than 80% of polypropylene materials are used to produce automobile bumpers. However, polypropylene has poor impact performance at room temperature or low temperature, high notch sensitivity, low temperature resistance, and easy aging, which greatly limits its application in automobile bumpers. [0003] In order to overcome the above defects of polyp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L23/20C08F110/06C08F2/06C08F2/34C08F2/02C08F210/08C08F210/14C08F236/08C08F236/04C08F236/20C08F4/646
Inventor 邵华锋刘晨光贺爱华
Owner QINGDAO UNIV OF SCI & TECH
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