Transparent phenylethylene-dialkene star shaped copolymer and continuous preparation thereof

A diene star and styrene technology, applied in the field of transparent styrene-diene star copolymer and its continuous preparation, can solve problems such as large rigidity loss, and achieve low production cost, high transparency and low operating cost Effect

Inactive Publication Date: 2012-05-09
ZHEJIANG SANPO POLYMER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The weight percentage of butadiene in K-Resin is generally 20-35%. Although it overcomes the shortcomings of general-purpose polystyrene, such as brittleness and environmental stress cracking resistance, its rigidity loss is lower compared with general-purpose polystyrene. Large, the application in some fields is not ideal, so in the application fields that require long-term rigidity, K-Resin cannot completely replace general-purpose polystyrene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The operating temperature of the reverse conveying four-screw extruder with an aspect ratio of 200 was controlled at 200° C., and the rotational speed was controlled at 30 r / min. The monomer styrene in the liquid state is pumped into the reverse conveying four-screw extruder for one-stage polymerization; when the conversion rate of the first-stage monomer reaches more than 95%, 1,3-butadiene is added for two-stage polymerization; the second-stage When the monomer conversion rate is greater than 95%, add 1,3-butadiene and styrene mixed monomers for three-stage polymerization, then add styrene for four-stage polymerization, and finally add coupling agent to form a 3 "arm" star molecular structure. The weight ratio of styrene to 1,3-butadiene during polymerization is: 80.1:19.9. Then by using the German Bruker NMR instrument ( 1 H NMR) to measure the diene content, to obtain the final polymer, the weight percentage of 1,3-butadiene is 19.9%, as shown in Table 1, Table 1 ...

Embodiment 2

[0021] The working temperature of the forward conveying single-screw extruder with an aspect ratio of 140 was controlled at -10°C, and the rotational speed was controlled at 30r / min. The monomer styrene in the liquid state is pumped into the forward conveying single-screw extruder for one-stage polymerization; when the conversion rate of the first-stage monomer reaches more than 95%, 2-methyl-1,3-butadiene is added for two-stage polymerization. One-stage polymerization; when the conversion rate of the two-stage monomer is greater than 95%, a mixed monomer of 2-methyl-1,3-butadiene and styrene is added for three-stage polymerization, and finally a coupling agent is added to form a 10-arm star shaped molecular structure. The weight ratio of styrene to 2-methyl-1,3-butadiene during polymerization is: 88.0:12.0. Then by using the German Bruker NMR instrument ( 1 H NMR) to measure diene content, obtain 2-methyl-1 in the final polymer, the weight percent of 3-butadiene is 12%, as ...

Embodiment 3

[0023] The operating temperature of the reverse conveying reciprocating single-screw extruder with an aspect ratio of 10 is controlled at 80° C., and the rotational speed is controlled at 30 r / min. The liquid monomer styrene is pumped into the reverse conveying reciprocating single-screw extruder for one-stage polymerization; when the conversion rate of the first-stage monomer reaches more than 95%, 1,3-butadiene is added for two-stage polymerization; When the conversion rate of the second-stage monomer is greater than 95%, the mixed monomer of 1,3-butadiene and styrene is added for three-stage polymerization, and finally a coupling agent is added to form a star-shaped molecular structure with 5 "arms". In the polymerization process, the weight ratio of styrene and 1,3-butadiene is: 92.0: 8.0, then by adopting German Bruker nuclear magnetic resonance instrument ( 1 HNMR) to measure diene content, obtain in the final polymer, the weight percent of 1,3-butadiene is 8%, as shown in...

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Abstract

The invention discloses a transparent styrene-diolefin star copolymer and a continuous preparation method thereof. The copolymer has the following structure: (PS-PB-PB / PS-PS) n-R or (PS-PB-PB / PS) n-R, wherein PS represents a polystyrene block, PB represents a polydiolefin block, PB / PS represents a styrene-diolefin random copolymer block, and R represents the core of the star structure. The invention also discloses the continuous preparation method for the copolymer. The preparation method has a high monomer conversion rate above 99.999 percent. The preparation method is characterized by low production cost, short reaction time, high yield, low operating cost, simple maintenance, no leakage of unconverted monomers and solvents during the production, reutilization, safety and environmental protection, and wide application range.

Description

technical field [0001] The present invention relates to a transparent styrene-diene star copolymer and its continuous preparation method. Background technique [0002] Styrene resin is one of the five general-purpose synthetic resins, and generally ranks fourth in terms of output after PE, PVC and PP. Polystyrene (PS), in 1925, the German I.G.Farben Industrial Company began to engage in the industrial production and development of styrene, and realized industrial production in 1930. In 1958, China began to prepare for production equipment, creating the industrial production of polystyrene resin in China. In the early stage of the development of styrene-based resins, only general-purpose polystyrene was produced. It is hard and brittle, has low mechanical strength, poor heat resistance, and is flammable. For this reason, people have done a lot of improvement work, forming high-impact polystyrene (HIPS), expandable polystyrene (EPS), styrene-butadiene copolymer (K-Resin) an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F297/04
Inventor 周赞斌程国丽冯震高碧波高书峰
Owner ZHEJIANG SANPO POLYMER
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