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Process for preparing polyolefin alloy

A polyolefin and alloy technology, which is applied in the field of polyolefin alloy preparation, can solve the problems of decreased rigidity, difficulty in balancing alloy rigidity and toughness at the same time, and achieve the effects of high flexural modulus, reduced product cost, and high impact strength

Inactive Publication Date: 2002-11-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented method allows for simultaneously producing both flexible-modulus (high tensile) and strong properties with good particle size distribution consistently without causing issues like clumping or stickiness during production. By mixing different types of starting material together, this new type can be used more effectively than existing ones due to its unique shape characteristics.

Problems solved by technology

This patented technical solution described for improving the quality of thermoplastic resin compositions involves combining different types of plastic together through physical mixing methods like milling or extrusion processes. These techniques improve the flexibility and durability of these mixtures while maintaining excellent thermal stability compared to pure material made from each type alone.

Method used

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Examples

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preparation example Construction

[0018] The preparation method of the polyolefin alloy includes several steps such as prepolymerization, ethylene polymerization (or copolymerization), propylene polymerization (or copolymerization) and ethylene / propylene copolymerization. The specific operation method and process conditions can be selected from the following methods according to the needs.

[0019] Step 1) Pre-polymerization adopts a slurry polymerization process. The pre-polymerized monomer is propylene, or 1-butene, styrene, or 4-methyl-1-pentene. The preferred prepolymerization conditions are: temperature 0-60°C, solvent n-heptane, n-hexane or petroleum ether, monomer concentration 0.1-1.0 mol / L. The cocatalyst is triethylaluminum or triisobutylaluminum. The molar ratio of titanium in the main catalyst to aluminum in the co-catalyst is 50-200. The molar ratio of the external electron donor compound to titanium is 5-20. The stirring method and stirring speed of the pre-polymerization reaction need to be ...

Embodiment 1

[0027] The PE / PP or PE / PP / EPR reactor alloy synthesized by the above step 3) or step 4) polymerization process exhibits excellent mechanical properties, and its main features are: both high rigidity (flexural modulus of 1300~ 1600MPa), and high impact strength (notched Izod impact strength greater than 200J / m), and the impact resistance at low temperature is very outstanding (notched Izod impact strength at -30°C is greater than 80J / m). In addition to maintaining high rigidity and impact strength, the PE / PP / EPR alloy synthesized by the four-stage polymerization process further improves the low-temperature impact strength (the notched Izod impact strength at -30°C is greater than 120J / m). These two alloy materials can be used in occasions that require high low temperature impact resistance and high rigidity at the same time. The preparation of embodiment 1 spherical PE particles (1) pre-polymerization

[0028] Under the protection of inert gas, add petroleum ether, cocatalyst ...

Embodiment 3

[0032] The prepolymerization of embodiment 3 and ethylene polymerization operating procedure and reaction condition are identical with embodiment 1. After ethylene polymerization was carried out for 1 hour, the ethylene pressure in the kettle was reduced to -0.09MPa (gauge pressure) and maintained for 30 seconds, then propylene was pressed to 0.7MPa, and the reaction was continued at 60°C for 3 hours to obtain 165g of the product. The product is regular spherical particles with an average particle diameter of 2.3mm and a porosity of 24%. The polyethylene content in the product was 41.3% (wt). The operating procedure and reaction conditions of embodiment 4 are the same as embodiment 3, but the ethylene polymerization time is reduced to 30 minutes. 126 g of product were obtained. The polyethylene content of the product was 28.5%. Embodiment 5~7 and comparative example 8,9

[0033] The prepolymerization method is the same as in Example 1. In Examples 5-7, ethylene polymeriza...

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Abstract

A process for preparing polyolefin alloy includes such steps as firstly, prepolymerization of propene as monomer with the trialkyl aluminium-catalyzed slurry under the action of TiCl4/MgCl2.ID carried spherical catalyst, where ID is diisobulyl phlhalate; then swithing to ethene as monomer for ethene slurry or gas-phase polymerization in saturated hydrocarbon as medium; and further switching to propene as monome for propene slurry or gas-phase polymerization in saturated hydrocarbon as medium. Its advantages are simple process and low cost. Its product features high bending modulum and impact strength, regular spherical form and low cost.

Description

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Claims

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Application Information

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Owner ZHEJIANG UNIV
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