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Preparation methods for polyolefin alloy

A polyolefin and alloy technology, applied in the field of polyolefin alloys, can solve the problem of high content of random substances, and achieve the effects of improving productivity, good hydrogen sensitivity, and realizing rational utilization

Active Publication Date: 2015-07-15
QINGDAO UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above patents involve the copolymerization reaction of butene-1 and other α-olefins, the content of random substances is relatively high, and the obtained products are all soluble in the medium

Method used

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  • Preparation methods for polyolefin alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The reaction device for the preparation of polybutene alloy material by the continuous method process of the present invention is a pilot plant with a production capacity of 15kg / h, which is connected in series by three stainless steel pressure-resistant reactors with mechanical stirring devices and temperature control jackets. There is a separator between the first reactor and the third reactor, and the third reactor is followed by a flash tank. Cocatalyst triethylaluminum (5% by mass percent hexane solution), external electron donor diisopropyldimethoxysilane (3% by mass percent hexane solution), Ti-containing main catalyst (5% by mass percent % liquid paraffin mixed liquid), hexane, liquid butene-1, and hydrogen continuously enter the first reactor at a fixed rate to carry out butene-1 liquid phase polymerization. At the same time, the materials in the first reactor flow out into the second reactor at a certain rate to continue the homopolymerization of butene-1. Th...

Embodiment 2

[0046] Using the same continuous polymerization device and operating process as in Example 1, the cocatalyst is changed to triisobutylaluminum (5% hexane solution by mass percent), and the external electron donor is changed to methylcyclohexyldimethoxysilane (3% hexane solution by mass percent), the mol ratio of the Al element of triisobutylaluminum to the Ti element in the main catalyst is 80:1, the Al element of triethylaluminum and the external electron donor methylcyclohexyl di The molar ratio of methoxysilane is 8:1, and other conditions are the same as in Example 1.

[0047] The polymerization product is free-flowing granular or spherical fine powder particles, and the properties of the obtained polymer alloy are shown in Table 1.

Embodiment 3

[0049] Using the same continuous polymerization device as in Example 1, the molar ratio of Ti element to butene-1 in the main catalyst is 1 × 10 -6 : 1, the mol ratio of the Al element in the triethylaluminum and the Ti element in the main catalyst is 100:1, and the mol ratio of the Al element in the triethylaluminum and the external electron donor diisopropyldimethoxysilane is 10:1, control the flow rate of monomer propylene entering the third tank so that the flow rate ratio of butene-1 is 5:1. The temperatures of the three reactors are 30°C, 50°C, and 80°C, the pressures are controlled at 1.2MPa, 0.9MPa, and 2.0MPa, and the residence times are 0.5h, 6h, and 2h, respectively.

[0050] The polymerization product is free-flowing granular or spherical fine powder particles, and the properties of the obtained polymer alloy are shown in Table 1.

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Abstract

The invention discloses preparation methods for a polyolefin alloy. A first preparation method for the polyolefin alloy comprises a first step of polymerization of butene-1 and a second step of introduction of propylene so as to obtain a polyolefin alloy with polybutene-1 as a core and polypropylene as a shell. A second preparation method for the polyolefin alloy comprises a first step of polymerization of propylene and a second step of introduction of butene-1 so as to obtain a polyolefin alloy with polypropylene as a core and polybutene-1 as a shell. The two methods both employ a continuous slurry polymerization process for polymerization in three or more than three tandem reactors so as to obtain a polybutene alloy material including, by mass, 10 to 99% of polybutene-1, 1 to 80% of polypropylene and 0.01 to 10% of a butylenes-1-propylene copolymer. With the continuous production process in the invention, a process cycle is shortened; the preparation methods are simplified; the content of a random copolymer is reduced as much as possible and the modulus of the alloy is guaranteed; the prepared polybutene alloy material can replace a part of polyethylene and polypropylene in use; production power is improved; and industrial production is facilitated.

Description

technical field [0001] The invention relates to the technical field of preparation of polyolefin alloy materials, in particular to a preparation method of polyolefin alloy, especially polybutene alloy. Background technique [0002] The polybutene alloy material improves its strength and modulus without affecting the high temperature creep resistance and impact resistance of the poly1-butene resin. The preparation of polybutene alloy by in-situ polymerization in the kettle can effectively improve the two-phase dispersion problem of physical blending of polybutene and polypropylene, and at the same time, the in-situ synthesis of a small amount of copolymer can significantly improve the phase interface of the alloy, and also Parameters such as the composition content, molecular weight and distribution of the alloy can be adjusted by changing the parameters of the polymerization process. Therefore, the preparation of polybutene alloy by in-situ polymerization in the kettle can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/20C08L23/12C08F110/08C08F110/06C08F4/649C08F2/06C08F2/01
CPCC08F110/06C08F110/08C08L23/12C08L23/20C08L2205/18C08L2205/025C08L2205/03C08L2308/00C08L2314/02C08L2207/53C08F2/06C08F2/01C08F4/6498C08F4/685
Inventor 贺爱华刘晨光邵华锋姜秀波
Owner QINGDAO UNIV OF SCI & TECH
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