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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 segment acts as a physical cross-link points, restricting the mobility of SBS, making it easy to form cross-linked polymers in the process of toughening HIPS to form supermacromolecules

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

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Add 2.5 liters of hexanaphthene and raffinate mixture (the mixing ratio of hexanaphthene and raffinate is 9: 1) in the 5 liters of polymerizers that purify through nitrogen, wherein be 300mg / kg with the content in polymerization solvent The amount of tetrahydrofuran was added. The temperature of the mixture was raised 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, 150 g of butadiene was added to the active polymer, during which the reaction temperature was controlled at 40-115° C., stirred for 20-60 minutes, and then 5 ml of water was added to terminate the reaction. Add 0.2-0.6% of 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 as a solid suspended in water. The solid is separated, squeezed...

Embodiment 2

[0073]Add 2.5 liters of hexanaphthene and raffinate mixture (the mixing ratio of hexanaphthene and raffinate is 9: 1) in the 5 liters of polymerizers that purify through nitrogen, wherein be 300mg / kg with the content in polymerization solvent The amount of tetrahydrofuran was added. The mixture was warmed to 50° C., and 2.15 mmol of n-butyllithium were added. After stirring for 5 minutes, 162.6 g of butadiene monomer was added into the polymerization tank, during which the reaction temperature was controlled at 40-110° C., and the reaction was carried out for 20-60 minutes. Then add 75g styrene in the reactor, react and carry out 20-60 minute. Then add 12.4g of butadiene to the reaction kettle, react for 5-30 minutes, finally add 5ml of coupling agent silicon tetrachloride, react for 10-40 minutes, add 0.2-0.6% anti-corrosion compound based on the mass of polymer in the mixture Oxygen, stir for 5 minutes. Finally, the product is added to a mixture of steam and water, the so...

Embodiment 3

[0083] The styrene-butadiene copolymer of the linear structure of 0.48 kilograms of embodiment 1 of the present invention is mixed with 6 kilograms of general-purpose polystyrene, joins in twin-screw extruder and causes HIPS particle, and the temperature of 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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