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Polypropylene/polystyrene alloy and preparation method thereof

A polystyrene and polypropylene technology, applied in the field of polypropylene/polystyrene alloy and its preparation, can solve the problems of many side reactions and complex process, and achieve improved compatibility, simple process and increased free volume Effect

Inactive Publication Date: 2015-11-11
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has problems such as complex process and many side reactions.

Method used

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  • Polypropylene/polystyrene alloy and preparation method thereof
  • Polypropylene/polystyrene alloy and preparation method thereof

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preparation example Construction

[0020] The invention provides a kind of preparation method of polypropylene / polystyrene alloy, it comprises the steps:

[0021] a Weigh 50-90 parts by weight of polypropylene, 10-50 parts by weight of polystyrene, 1-5 parts by weight of acrylate monomer with multifunctional groups, 0.1-0.5 parts by weight of antioxidant, and 0.01-0.5 parts by weight of initiator share;

[0022] b. Add the acrylate monomer with multifunctional groups, antioxidant and initiator into the organic solvent to premix and obtain a premixed solution, and then mix the premixed solution with polypropylene and polystyrene to obtain a mixture;

[0023] c. Put the mixture into a screw extruder, and feed supercritical carbon dioxide into 1 / 5-1 / 3 of the screw of the screw extruder, and melt and extrude to obtain a polypropylene / polystyrene alloy.

[0024] In step a, the polypropylene can be homopolypropylene, copolymerized polypropylene or a blend of the two in any proportion, and the melt index of the polyp...

Embodiment 1

[0032] Weigh 0.1 part of dibenzoyl peroxide, 0.2 part of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester and 3 parts of 1,6-hexanediol diacrylic acid ester;

[0033] Add dibenzoyl peroxide, tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol, 1,6-hexanediol diacrylate into 5 mL of acetone and pre-mix Obtain the premixed solution, put 70 parts of polypropylene, 30 parts of polystyrene and the premixed solution into the high-speed mixer afterwards, mix 10min with the speed of 300r / min to obtain the mixture, wherein, initiator dibenzoyl peroxide and The weight ratio of acetone is 1:70;

[0034] The mixture is added to the screw extruder; wherein, the screw speed is set to 40r / min, the temperature in the first half of the screw is set to 190°C, and the temperature in the second half of the screw is set to 165°C; 5 Parts by weight of carbon dioxide in a supercritical state, the injection pressure is set to 10 MPa, and the po...

Embodiment 2

[0036] Weigh 0.08 parts of dicumyl peroxide, 0.1 parts of thiodiethylene bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] and 5 parts of trimethylolpropane Triacrylate;

[0037] Add dicumyl peroxide, thiodiethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and trimethylolpropane triacrylate into 3 mL of ethanol Pre-mixed to obtain a pre-mixed solution, then put 70 parts of polypropylene, 30 parts of polystyrene and the pre-mixed solution into a high-speed mixer, and mixed at a speed of 300r / min for 10 minutes to obtain a mixture, wherein the initiator diisopropyl peroxide The weight ratio of benzene to ethanol is 1:60;

[0038] The mixture is added to the screw extruder; wherein, the screw speed is set to 70r / min, the temperature in the first half of the screw is set to 205°C, and the temperature in the second half of the screw is set to 158°C; 10 Parts by weight of carbon dioxide in a supercritical state, the injection pressure is set to 14 MPa, and the polyp...

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Abstract

The invention provides a preparation method of polypropylene / polystyrene alloy. The preparation method comprises the following steps: 1, weighing, by weight, 50-90 parts of polypropylene, 10-50 parts of polystyrene, 1-5 parts of acrylate monomers with polyfunctional groups, 0.1-0.5 part of antioxygen and 0.01-0.5 part of initiating agent; 2, adding the acrylate monomers with polyfunctional groups, the antioxygen and the initiating agent into organic solvent, conducting premixing, obtaining a premixed solution, and then mixing the premixed solution, the polypropylene and the polystyrene for obtaining a mixture; 3, adding the mixture into a screw extruder, introducing supercritical carbon dioxide at 1 / 5-1 / 3 position of a screw of the screw extruder, conducting melt extrusion, and obtaining the polypropylene / polystyrene alloy. According to the method, the supercritical carbon dioxide is introduced into the screw, the reaction temperature is lowered substantially, the reaction capacity between the polypropylene and the polystyrene is improved greatly, more polypropylene grafted polystyrene is formed in situ, and therefore the consistency between the polypropylene and polystyrene is improved remarkably. The invention further provides the polypropylene / polystyrene alloy.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a polypropylene / polystyrene alloy and a preparation method thereof. Background technique [0002] Polypropylene and polystyrene are widely used polymer materials, both of which have their own performance advantages and application fields. Among them, polypropylene has the characteristics of low price, low density, non-toxicity, chemical corrosion resistance and excellent mechanical properties, but it has the characteristics of large molding shrinkage and easy shrinkage and deformation, which limits its application range. Polystyrene has a small shrinkage rate and high rigidity, but it is brittle, has low impact strength, and is prone to stress cracking. Therefore, it is hoped that by blending the above two polymers, a high-performance polypropylene / polystyrene alloy with both common advantages can be obtained. [0003] However, polypropylene and polystyrene are two co...

Claims

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Application Information

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IPC IPC(8): C08F291/00C08F222/14C08K5/134C08K5/375C08K5/18C08K5/526C08L23/12C08L25/06
CPCY02P20/54
Inventor 郑文革庞永艳王坤吴飞王舒生
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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