Synthesis method of transparent block copolymer

Abstract

The invention discloses a synthesis method of transparent block copolymer, which comprises the following steps of: mixing diluent and polar compounds of 60 to 90 percent of the total weight of diluent, initiator of 40-70 percent and monovinylarene aryl hydrocarbon of 20-30 percent of total monomer under conditions with no water or oxygen but with high-purity argon, and vigorously stirring for 40-80min at 50-80 DEG C; adding monovinylarene aryl hydrocarbon of 13-22 percent of total monomer, and stirring 40-80min; adding conjugated diene of 4-7 percent of total monomer, and stirring for 40-80min; adding initiator of 30-60 percent and monovinylarene of 18-25 percent of total monomer, and stirring for 40-80min; adding conjugated diene of 18-20 percent of total monomer into a polymerization reactor, and making mixture react for 40-80min; adding monovinylarene aryl hydrocarbon into the polymerization reactor, making mixture reactor for 40-80 min, and adding CO2; and adding methanol or ethanol to prepare polymerization products, and naturally drying the polymerization products. The invention has the advantages of no coupling, simple steps and high transmittance.

Description

technical field [0001] The invention belongs to the technical field of block copolymers, in particular to a method for synthesizing transparent block copolymers. Background technique [0002] At present, transparent plastic products are used more and more widely in the world, and the fields can involve toy production, medical equipment, hard and flexible packaging, containers, household appliances, displays and clothes hooks, etc., and have greater market competitiveness. Commonly used transparent plastic materials include acrylic resin, polycarbonate, styrene-acrylonitrile copolymer, styrene-methyl methacrylate copolymer, polyvinyl chloride, and polyethylene terephthalate. From the perspective of raw materials, preparation process and product performance, the block copolymer prepared by solution polymerization of aromatic monoolefin such as styrene and conjugated diene such as 1,3-butadiene is different from the above-mentioned commonly used transparent Compared with plast...

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Problems solved by technology

[0007] So far, although many patents have explained the preparation process and structure of block copolymers of aromatic monoolefins and conjugated dienes, it is known from the above and other related patents that most of the preparation processes are relatively complicated, and there are times of addition and There are many synthesis steps, etc.

Since the synthesis of such block copolymers needs to be carried out under harsh conditions of anhydrous and oxygen free, the more complicated the preparation process is, the easier it is to introduce impurities, which leads to an increase in the probability of experimental failure

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