Styrene-butadiene copolymer as well as preparation and applications thereof

A technology of butadiene and styrene, applied in the field of styrene-butadiene copolymer and its preparation, can solve problems such as restricted mobility

Active Publication Date: 2013-04-10
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The molecular composition of traditional block SBS is composed of three segments: polystyrene segment (S)-polybutadiene segment (B)-polystyrene segment (S), and the PS segme

Method used

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  • Styrene-butadiene copolymer as well as preparation and applications thereof
  • Styrene-butadiene copolymer as well as preparation and applications thereof
  • Styrene-butadiene copolymer as well as preparation and applications thereof

Examples

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Example Embodiment

[0065] Example 1

[0066] Add 2.5 liters of a mixture of cyclohexane and raffinate (the mixing ratio of cyclohexane and raffinate is 9:1) into a 5-liter polymerization vessel purged with nitrogen, and the content in the polymerization solvent is 300 mg / kg Add tetrahydrofuran in the same amount. The mixture was heated to 50° C., 100 g of styrene was first added, and then 1.0 mmol of n-butyllithium was added to initiate the reaction. After stirring and reacting for 20-60 minutes, 150g of butadiene was added to the living polymer, during which the reaction temperature was controlled at 40-115°C, the reaction was stirred for 20-60min, and then 5ml of water was added to terminate the reaction. Add 0.2-0.6% antioxidant based on the mass of the polymer to the reaction mixture, and stir for 5 minutes. Finally, the product is added to a mixture of steam and water, the solvent is evaporated, and the polymer is isolated in a solid state and suspended in water. Separate the solids, squeez...

Example Embodiment

[0072] Example 2

[0073] Add 2.5 liters of a mixture of cyclohexane and raffinate (the mixing ratio of cyclohexane and raffinate is 9:1) into a 5-liter polymerization vessel purged with nitrogen, and the content in the polymerization solvent is 300 mg / kg Add tetrahydrofuran in the same amount. The mixture was heated to 50°C, and 2.15 mmol of n-butyllithium was added. After stirring for 5 minutes, 162.6 g of butadiene monomer was added to the polymerization vessel, during which the reaction temperature was controlled at 40-110°C, and the reaction was carried out for 20-60 minutes. Then 75g of styrene is added to the reaction kettle, and the reaction is carried out for 20-60 minutes. Then add 12.4g of butadiene to the reaction kettle, react for 5-30 minutes, and finally add 5ml of coupling agent silicon tetrachloride, react for 10-40 minutes, add 0.2-0.6% of the antioxidant based on the mass of the polymer to the mixture. Oxygen, stir for 5 minutes. Finally, the product is add...

Example Embodiment

[0082] Example 3

[0083] 0.48 kg of the linear structure styrene-butadiene copolymer of Example 1 of the present invention is uniformly mixed with 6 kg of general-purpose polystyrene, and added to the twin-screw extruder to form HIPS particles. The temperature of the twin-screw machine is 140°C.

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Abstract

The invention relates to a styrene-butadiene copolymer as well as a preparation method and applications thereof. The styrene-butadiene copolymer is obtained by regulating an arrangement mode of a polystyrene chain segment and a polybutadiene chain segment, wherein the polybutadiene chain segment can freely move. The copolymer is mainly used for preparing high-gloss and high-impact-resistance polystyrene. According to the styrene-butadiene copolymer provided by the invention, the viscosity of 5 % styrene solution of the styrene-butadiene copolymer is low, the styrene-butadiene copolymer exists in a polystyrene polymer molecular chain mainly in a block mode when being added into the polystyrene, can also freely flow in the polystyrene, can be used for improving the physical and mechanical properties of the polystyrene and is particularly used for keeping high gloss of the polystyrene when the properties are impacted.

Description

technical field [0001] The invention relates to a styrene-butadiene copolymer and its preparation method and application. More specifically, the present invention obtains styrene-butadiene copolymers in which polybutadiene segments can move freely and the copolymer by adjusting the arrangement of polystyrene segments and polybutadiene segments. The polymerization method and the application of the copolymer are used to prepare high-gloss and high-impact polystyrene. Background technique [0002] High-impact polystyrene is a chemically grafted high-impact polystyrene obtained by adding synthetic rubber to styrene monomers for free radical polymerization. The synthetic rubber used is mainly polybutadiene rubber, which is divided into low-cis polybutadiene rubber and high-cis polybutadiene rubber. The impact strength of polystyrene modified by polybutadiene rubber is greatly increased, but while the impact strength of polystyrene is improved, the gloss of the product is greatl...

Claims

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Application Information

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IPC IPC(8): C08F297/04C08F8/42C08L25/06C08L53/02C08F287/00
Inventor 许安军彭红丽余振银梁红文陈徐忠胡朝阳
Owner CHINA PETROLEUM & CHEM CORP
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