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Preparation method of syndiotactic polystyrene

A technology of polystyrene and styrene, which is applied in the field of polystyrene preparation, can solve the problems of poor processing fluidity, bending resistance, low impact strength, high rigidity, etc., and achieve the effect of improving processing performance

Inactive Publication Date: 2019-10-18
山东菏泽玉皇化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The molecular weight distribution of existing syndiotactic polystyrene (sPS) is generally 1-3, and the molecular chain rigidity is relatively large, resulting in brittle materials, low bending and impact strength, and poor processing fluidity, which limit its wide application. application
Due to the narrow molecular weight distribution (MWD) of sPS obtained by traditional methods, there is often a problem of edge-inward shrinkage during hollow molding, sheet and film molding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1, a kind of syndiotactic polystyrene preparation method of high molecular weight distribution

[0018] (1) Weigh 1.0g main catalyst, wherein Cp*ZrCl 3 and [Cp*Zr] 2 [(CH 3 ) 2 C(C 6 h 4 O) 2 ] 3 The molar ratio is 1:1, and Cp* is pentamethylcyclopentadienyl; the above-mentioned main catalyst is dissolved in toluene for later use.

[0019] (2) Clean the self-cleaning reaction kettle, dry it at 120°C, and replace it with high-purity nitrogen several times to ensure that the content of water, oxygen and other impurities in the self-cleaning reaction kettle is 8ppm.

[0020] (3) Add 1.5 L of styrene monomer, the catalyst prepared in step (1), 1 L of isopentane, 15 ml of MAO (10% toluene solution), and 20 ml of triethylaluminum into the reactor.

[0021] (4) Set the temperature to 120°C, start the self-cleaning reactor, and stop running after 2 hours of reaction.

[0022] (5) After the reaction, the product was taken out and soaked in ethanol, then filte...

Embodiment 2

[0024] Example 2: Weigh 0.075g of the main catalyst, the molar ratio of A:B is 0:1, and dissolve it in toluene for later use. After the self-cleaning reactor is cleaned up, add 1.2L of refined styrene, 300mL of n-hexane, 10ml of MAO (10% toluene solution), 15ml of triisobutylaluminum, set the temperature at 70°C, start the self-cleaning reactor, and react Stop running after 1h. After the reaction, the product is taken out and soaked in ethanol, then filtered and dried to obtain the finished product syndiotactic polystyrene. The detected molecular weight distribution of syndiotactic polystyrene is 1.9, and the melting point is 270.3°C.

Embodiment 3

[0025] Example 3: Weigh 0.059g of the main catalyst, the molar ratio of which is A:B is 0.3:1, and dissolve it in toluene for later use. After the self-cleaning reactor is cleaned up, add 1.2L of refined styrene, 0L of n-hexane, 4ml of MAO (10% toluene solution), 6ml of triisobutylaluminum, set the temperature at 100°C, start the self-cleaning reactor, and react Stop running after 0.5h. After the reaction, the product is taken out and soaked in ethanol, then filtered and dried to obtain the finished product syndiotactic polystyrene. The detected molecular weight distribution of syndiotactic polystyrene is 4.7, and the melting point is 269.7°C.

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PUM

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Abstract

The invention relates to a preparation method of syndiotactic polystyrene (sPS). The method comprises the following steps: performing a reaction by using styrene as a monomer, a metallocene zirconiumcompound as a main catalyst, a mixture of methylaluminoxane (MAO) and triethylaluminum as a cocatalyst, and isopentane as a heat dissipating agent for 0.5-2 h at normal pressure and 110-130 DEG C; andafter the reaction is completed, taking out the product, performing soaking by using ethanol, performing filtration, and performing drying to obtain the syndiotactic polystyrene having molecular weight distribution of 5-10. According to the method provided by the invention, the sPS prepared by the method has wider molecular weight distribution, and does not have the problem that inward shrinkageof edges easily occurs when original sPS is used for hollow molding, sheets and film forming; and the method greatly improves processing performance of the sPS under the premise of ensuring the basicperformance is unchanged.

Description

technical field [0001] The invention relates to a method for preparing polystyrene, in particular to a method for preparing syndiotactic polystyrene with high molecular weight distribution. Background technique [0002] The molecular weight distribution of existing syndiotactic polystyrene (sPS) is generally 1-3, and the molecular chain rigidity is relatively large, resulting in brittle materials, low bending and impact strength, and poor processing fluidity, which limit its wide application. application. Due to the narrow molecular weight distribution (MWD) of sPS obtained by traditional methods, there is often a problem of edge-in shrinkage during hollow molding, sheet and film molding. Contents of the invention [0003] In order to make up for the defects of the prior art, the invention provides a method for preparing syndiotactic polystyrene with high molecular weight distribution. The method includes: [0004] With styrene as monomer, metallocene zirconium compound...

Claims

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Application Information

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IPC IPC(8): C08F112/08C08F2/38C08F4/6592
CPCC08F112/08C08F4/6592C08F2/38
Inventor 张怀泉蔡杰郭天鹏宋春华
Owner 山东菏泽玉皇化工有限公司