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A kind of preparation method of polypropylene foam special material based on sorbitol acetal compound

A technology of sorbitol acetal and compound, which is applied in the field of polypropylene foaming, can solve the problems of reduced processing fluidity, inability to balance polypropylene melt strength and processing fluidity, and processing difficulties, etc.

Inactive Publication Date: 2018-06-26
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, these methods cannot take into account the melt strength and processing flow properties of polypropylene. When the melt strength is improved, the processing fluidity is usually reduced, which brings difficulties to the subsequent processing of the product.

Method used

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  • A kind of preparation method of polypropylene foam special material based on sorbitol acetal compound
  • A kind of preparation method of polypropylene foam special material based on sorbitol acetal compound
  • A kind of preparation method of polypropylene foam special material based on sorbitol acetal compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 100 parts of homopolypropylene (produced by Sinopec Yangzi Petrochemical Company, brand F401) were evenly added from the main feeding port of the extruder; 0.3 parts of benzoyl peroxide and 0.2 parts of 1,3:2,4-bis( p-Methylbenzylidene) sorbitol is evenly added from the weight-loss metering feeding system; 0.3 parts of styrene and 4 parts of petroleum ether are miscible and added from the second heating zone of the extruder through a precision feed pump to extrude and make pellets to obtain special polypropylene foaming materials. Simultaneously open the vacuum pump at the tail of the extruder to remove unreacted styrene.

[0017] Among them, the length-to-diameter ratio of the extruder is 40; the temperatures of the 9 heating zones are: 140°C, 160°C, 180°C, 190°C, 200°C, 200°C, 200°C, 210°C, 210°C; The speed of the main feeding screw is 120r / min, the speed of the main feeding screw is 20r / min, the feeding speed of the loss-in-weight metering feeding system is 2.5Kg / mi...

Embodiment 2

[0021] Add 100 parts of homopolypropylene (produced by Sinopec Yangzi Petrochemical Company, brand F401) from the main feeding port of the extruder; add 0.2 parts of dicumyl peroxide and 0.5 parts of 1,3:2,4-di (3,4-Dimethylbenzaldehyde) sorbitol is evenly added from the weight-loss metering feeding system; 0.2 parts of divinylbenzene, 0.05 parts of styrene and 4 parts of acetone are miscible and heated from the second section of the extruder The zone is added through a precision feed pump, extruded and granulated to obtain foamed polypropylene special materials. Among them, the feeding speed of the loss-in-weight metering feeding system is 3.5Kg / min; the flow rate of the precision feeding pump is 3mL / min.

[0022] Its operating steps and implementation method are all with embodiment 1.

Embodiment 3

[0024] Add 100 parts of homopolypropylene (produced by Sinopec Yangzi Petrochemical Company, brand F401) from the main feeding port of the extruder; 3: 2,4-bis (p-chlorobenzylidene) sorbitol is evenly added from the weight-loss metering feeding system; It is added through a precision feed pump, extruded and granulated to obtain a special material for polypropylene foaming. Among them, the feeding speed of the loss-in-weight metering feeding system is 8Kg / min; the flow rate of the precision feeding pump is 5mL / min.

[0025] Its operating steps and implementation method are all with embodiment 1.

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Abstract

The invention discloses a preparation technology of a polypropylene foaming special-purpose material of a sorbitol acetal compound. The polypropylene foaming special-purpose material comprises, by weight, 100 parts of polypropylene, 0.1-0.7 parts of an initiator, 0.1-1 part of a sorbitol acetal compound and 0.05-1 part of a benzenoid aromatic hydrocarbon grafted monomer. A volume ratio of the benzenoid aromatic hydrocarbon grafted monomer to a solvent is 1-15. The preparation technology comprises feeding polypropylene into an extruder through a main feed inlet, feeding the initiator and the sorbitol acetal compound into the extruder through an auxiliary feed system, dissolving the benzenoid aromatic hydrocarbon grafted monomer in the solvent, feeding the solution into the extruder through a liquid feed inlet, simultaneously, starting a vacuum pump at the tail of the extruder, pumping the solvent and the unreacted grafted monomer and carrying out reactive extrusion, cooling and granulation to obtain the polypropylene foaming special-purpose material. The preparation technology has simple processes, can be operated flexibly and is suitable for continuous industrial production of the polypropylene foaming special-purpose material with high melt strength and excellent processing fluidity.

Description

technical field [0001] The invention relates to the technical field of polypropylene foaming, in particular to a method of adding an initiator and a sorbitol acetal compound into an extruder through an auxiliary feeding system, and adding a benzene-type aromatic hydrocarbon graft monomer into an extruder through a liquid feed port. The invention discloses a method for preparing polypropylene foam special material in the machine. Background technique [0002] Polypropylene foam has a tendency to gradually replace other thermoplastic foams due to its excellent properties such as good toughness, high rigidity, fatigue resistance and environmental stress cracking resistance. However, general-purpose polypropylene is usually produced by Ziegler-Natta and metallocene catalysts. Its structure is linear and its molecular weight distribution is relatively narrow, which leads to its disadvantages such as poor toughness, low melt strength and poor sag resistance. Limit its application...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08K5/1575C08F255/02B29B9/06B29C47/40B29C47/80B29C47/60B29C47/10B29C31/06
Inventor 辛忠周帅王卫霞
Owner EAST CHINA UNIV OF SCI & TECH
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