Preparation method for foamed polypropylene

A technology for foaming polypropylene and polypropylene, applied in the field of foaming materials, can solve the problems of waste of carbon five fractions and low comprehensive utilization of raw materials, and achieve the effects of corrosion resistance, high impact strength, and excellent high temperature resistance.

Active Publication Date: 2012-06-20
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this treatment method is that other components of the C5 fraction are wasted, and the comprehensive utilization level of raw materials is low

Method used

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preparation example Construction

[0025] The embodiment of the present invention discloses a preparation method of foamed polypropylene, comprising:

[0026] Mix and melt the raw materials to obtain foamed polypropylene;

[0027] The raw material comprises polypropylene, reaction aids and initiators with a weight ratio of 100:(0.5-50):(0.01-10);

[0028] The reaction aid includes at least a carbon five fraction;

[0029] The molar ratio of olefins and alkanes in the reaction aid is 1:(2-50).

[0030] The present invention directly utilizes the C5 fraction as a reaction aid to prepare foamed polypropylene. During the preparation process, the olefin in the C5 fraction acts as a crosslinking agent, and its double bonds can be grafted onto the main chain of polypropylene to improve the polypropylene foam. Improves the melt strength of propylene and improves its foaming properties. The alkanes in the C5 fraction mainly function as physical blowing agents.

[0031] In order to make the polypropylene melt have a ...

Embodiment 1

[0043] Adding n-pentane to the C5 fraction until the molar ratio of alkenes and alkanes is 1:10 to obtain a reaction aid;

[0044] Get 100 parts by weight of homopolypropylene powder with a melt index of 2.2g / 10min, 10 parts by weight of the above-mentioned reaction aids, 0.3 parts by weight of DHBP, 0.2 parts by weight of antioxidant B215 and 0.5 parts by weight of nucleating agent talcum powder , to obtain raw materials after uniform mixing;

[0045] Add the above raw materials into the twin-screw extruder for melt extrusion, set the temperature of the feeding section to 150°C, the temperature of the melting section to 230°C, the temperature of the reaction section to 230°C, the temperature of the extrusion section to 190°C, and the temperature of the die to 160°C , sheet die. After melt extrusion, a foamed polypropylene sheet with a foaming ratio of 10 times and a cell diameter of 100-300 microns is obtained.

Embodiment 2

[0047] Adding n-hexane to the C5 fraction until the molar ratio of alkenes and alkanes is 1:20 to obtain a reaction aid;

[0048] Get the melt index of 100 parts by weight and be 0.8g / 10min copolymerized polypropylene powder, the above-mentioned reaction aid of 20 parts by weight, the POE elastomer of 20 parts by weight, the TBPB of 0.3 parts by weight, 0.2 parts by weight of antioxidant 1010 and 0.5 parts by weight The nucleating agent silicon dioxide of weight part, obtain raw material after uniform mixing;

[0049] Put the above raw materials into a single-screw extruder for melt extrusion, set the temperature of the feeding section to 150°C, the temperature of the melting section to 230°C, the temperature of the reaction section to 230°C, the temperature of the extrusion section to 200°C, and the temperature of the die to 130°C , a sheet die, and after melt extrusion, a foamed polypropylene sheet with a foaming ratio of 30 times and a cell diameter of 500-800 microns is ob...

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Abstract

The invention provides a preparation method for foamed polypropylene. The method comprises: carrying out mixing, melting and extruding on raw materials to obtain the foamed polypropylene, wherein the raw materials comprise polypropylene, a reaction additive, and an initiator, the weight ratio is 100:(0.5-50):(0.01-10), the reaction additive comprises at least a C5 fraction, and a mole ratio of olefin to alkane in the reaction additive is 1:(2-50). According to the present invention, the C5 fraction is directly utilized to prepare the foamed polypropylene, the olefin in the C5 fraction provides an effect of a cross-linking agent during the reaction process, and the olefin component can be grafted on the polypropylene main chain by using the double bond of the olefin so as to increase the melt strength of the polypropylene, and improve the foaming performance of the polypropylene; the alkane in the C5 fraction mainly provides the effect of the physical foaming agent; the method provideshigh compressive utilization rate for the C5 fraction, such that the high value utilization of the C5 fraction is achieved; in addition, with the method of the present invention, the cheap price C5 fraction is adopted as the reaction additive, such that the production cost is reduced.

Description

technical field [0001] The invention relates to the field of foam materials, in particular to a preparation method of foam polypropylene. Background technique [0002] The C5 fraction is obtained from the separation of refinery gas and hydrocarbon cracking gas, mainly containing C 5 A mixture of hydrocarbons that is a volatile liquid at room temperature. The composition of the C5 fraction varies with different sources, mainly including C5 alkanes, alkenes, dienes, alkynes, and cycloalkanes, etc. Among them, the components with more uses include 1-pentene, isoprene, and cyclopentadiene Among them: 1-pentene is an important agricultural chemical intermediate; isoprene is mainly used in the synthesis of rubber and thermoplastic elastomers, and it is also an important pharmaceutical intermediate and spice intermediate; cyclopentene Diene is an intermediate of alicyclic petroleum resin and hydrogenated petroleum resin; piperylene is an important intermediate of cyclophatic petr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/14C08L23/12C08F255/02
Inventor 唐涛邢海平
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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