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
5 Cites 10 Cited by

AI-Extracted 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...
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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.

Technology Topic

Butadiene-styrene rubberPolystyrene +7

Image

  • 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(6)
  • Comparison scheme(3)

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, squeeze water with an extrusion dehydrator, and devolatilize in a drying box to obtain a linear structure of styrene-butadiene copolymer. The molecular weight of this copolymer is 290,000 (Mn). In this polymer, styrene and butadiene are polymerized in a block manner. The NMR and GPC spectra are shown respectively figure 1 , figure 2.

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 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, squeeze water with an extrusion dehydrator, and devolatilize in a drying box to obtain a star-shaped styrene-butadiene copolymer. The molecular weight of the copolymer is 400,000 (Mn). The nuclear magnetic spectrum and GPC spectrum are shown respectively image 3 , Figure 4.

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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Description & Claims & Application Information

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