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High impact high gloss bimodal polystyrene material and preparation method thereof

A polystyrene, high-gloss technology, used in the preparation of high-impact high-gloss bimodal polystyrene materials, high-impact high-gloss bimodal polystyrene materials

Active Publication Date: 2011-07-27
SHANGHAI SECCO PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method also requires two or more reaction zones

Method used

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  • High impact high gloss bimodal polystyrene material and preparation method thereof
  • High impact high gloss bimodal polystyrene material and preparation method thereof

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preparation example Construction

[0041] Preparation method of high-impact and high-gloss bimodal polystyrene material

[0042] A preparation method of a high-impact high-gloss bimodal polystyrene material provided by the invention comprises the following steps:

[0043] (a) providing a solution of polybutadiene rubber component in styrene monomer, wherein said polybutadiene rubber component is selected from high cis polybutadiene or low cis polybutadiene or a combination thereof , wherein the cis content of high cis polybutadiene is not less than 94 mole % (preferably such as 95 mole %-99 mole %), and the cis content of low cis polybutadiene is 33-40 mole %between;

[0044] (b) The solution in the step (a) is subjected to a prepolymerization reaction of styrene monomer to obtain a prepolymerization liquid system without phase transition;

[0045] (c) The pre-polymerization liquid system of the step (b) is further subjected to a polymerization reaction of styrene monomer under a shear force field until a pha...

Embodiment 1

[0079] Example 1 Modification of high-cis polybutadiene rubber to produce high-impact polystyrene .

[0080] The proportioning ratio of prepolymerized feed is shown in Table 1 below:

[0081] The prepolymerization feed ratio of table 1 embodiment 1

[0082] materials

parts by weight

other instructions

High cis polybutadiene rubber

7.5 parts by weight

The cis content is 96.5% by weight

Styrene

82.5 parts by weight

Ethylbenzene

9 parts by weight

mineral oil

1 part by weight

[0083] The rubber is fully dissolved in styrene, and the rubber solution is mixed with ethylbenzene, initiator, etc. according to a certain ratio to form the pre-polymerization feed, which is continuously fed into the pre-polymerization tank for pre-polymerization. The components are thoroughly mixed.

[0084] The prepolymerization tank is a continuous stirred tank reactor (CSTR), in which the reaction temperature is con...

Embodiment 2

[0090] Example 2 Modified raw materials using a blend of low-cis polybutadiene rubber and high-cis polybutadiene rubber Produced in high impact polystyrene.

[0091] Adopt the method as embodiment 1 to prepare high-impact high-gloss polystyrene material, the difference is that the formula is as follows in Table 2 and the process conditions are according to Table 4:

[0092] The prepolymerized feed ratio of table 2 embodiment 2

[0093] materials

[0094] Adjust the composition ratio of the materials entering the prepolymerization tank (and adjust according to the reaction conditions in Table 4), carry out prepolymerization in the prepolymerization tank to reach a certain conversion rate (measured as 9%), enter the main reactor, and carry out at 116 ° C. Reaction, the residence time is controlled to be 2.7h, so that styrene and rubber undergo grafting reaction, and a phase transition occurs, and the stirring speed is controlled at 28 rpm, so that the distribution ...

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Abstract

The invention provides a high impact high gloss bimodal polystyrene material and preparation method thereof, comprising the following steps: (a) the solution of polybutadiene rubber component mixed with polystyrene monomers is provided; wherein, the polybutadiene rubber component is selected from high cis-polybutadiene and / or low cis-polybutadiene, the cis-content of high cis-polybutadiene is notless than 94% by mole and the cis-content of low cis-polybutadiene is between 33% to 40% by mole ; (b) the solution obtained from the step (a) is used to perform prepolymerization reaction of styrenemonomers to obtain a prepolymerization solution system which does not generate phase transition; (c) the prepolymerization solution system obtained from the step (b) is used to perform further prepolymerization reaction of styrene monomers in shearing force field until the system generates phase transition to obtain rubbery state material of which the particle size presents bimodal distribution; (d) the conversion rate of styrene monomers in the material obtained from the step (c) is further increased to obtain the high impact high gloss bimodal polystyrene material. The invention also provides a preparation method of the high impact high gloss bimodal polystyrene material.

Description

technical field [0001] The present invention specifically relates to a method for preparing a bimodal polystyrene material and the resulting bimodal polystyrene material, more specifically, to a method for preparing a high-impact and high-gloss bimodal polystyrene material and The resulting high impact high gloss bimodal polystyrene material. Background technique [0002] In the prior art, it is known that the impact strength of polystyrene can be greatly improved by dispersing added rubbery particles throughout the polystyrene resin. However, while the impact strength of polystyrene is increased, the gloss of the product is greatly reduced, and the rubbery particle size and rubber particle concentration are the main reasons for the contradiction between the two. [0003] In order to solve the above-mentioned problem of gloss reduction, the prior art mainly adopts the technical solution of bimodal high-impact polystyrene, that is, the polystyrene material contains rubbery p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L25/08C08L51/04C08F279/02
Inventor 钱圣强王建龙申晓燕明键康毅勇姚会明
Owner SHANGHAI SECCO PETROCHEM
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