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Poly((meth)acrylic acid-b-styrene-b-(isoprene-co-butadiene)-b-styrene) block copolymer latex and preparation method

A block copolymer, ip-co-bd technology, applied in the field of block copolymer materials, can solve the problems of being unable to replace SBS commercial applications, losing the unique properties of elastomers, and losing the advantages of thermoplasticity, etc., to achieve good control, Avoid cross-linking problems and facilitate continuous production

Active Publication Date: 2016-08-24
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] At present, although SBS and SIS have been successfully prepared by living radical emulsion polymerization, compared with anionic solution polymerization, it has shown great advantages in terms of polymerization conditions, cost, and environmental protection. However, due to the characteristics of free radical polymerization, the prepared Due to the cross-linking polymerization of butadiene, the SBS bulk material has a serious gel problem, especially when the molecular weight of the butadiene segment is high, the cross-linking problem is serious, resulting in the loss of the thermoplastic advantage that the final material should have, and reduced After the butadiene chain end molecular weight is increased, the final material also loses its unique properties as an elastomer due to the reduction of butadiene soft segment components
In the process of SIS preparation, the problem of isoprene cross-linking is relatively less, but the price of isoprene is high, so that the SIS product obtained by this method cannot replace the commercial application field of SBS

Method used

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  • Poly((meth)acrylic acid-b-styrene-b-(isoprene-co-butadiene)-b-styrene) block copolymer latex and preparation method
  • Poly((meth)acrylic acid-b-styrene-b-(isoprene-co-butadiene)-b-styrene) block copolymer latex and preparation method
  • Poly((meth)acrylic acid-b-styrene-b-(isoprene-co-butadiene)-b-styrene) block copolymer latex and preparation method

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Experimental program
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preparation example Construction

[0027] A method for preparing the reversible addition-fragmentation chain transfer emulsion polymerization of the block copolymer latex according to claim 1, comprising the steps of:

[0028] (1) 2.4-7.5 parts by weight of the amphiphilic macromolecular reversible addition fragmentation chain transfer reagent is stirred and dissolved in 50-200 parts by weight of water to form a water phase, and then together with an oil phase composed of 10-100 parts by weight of St Pour into reactor and stir to mix. Raise the temperature of the reactor to 60-80°C, keep stirring, pass nitrogen to remove oxygen for more than 5 minutes, add 0.04-0.12 parts by weight of water-soluble initiator, and react for 1-2.5 hours to obtain X-AA n1 -b-St n2 -b-St n3 -R polymer latex.

[0029] (2) After the first step of reaction is completed, add 80-380 parts by weight of IP monomer and 20-240 parts by weight of Bd monomer, the reaction temperature is 60°C-80°C, and after 1-12 hours of reaction, the mate...

Embodiment 1

[0050] The first step: 5.5 parts by weight of the amphiphilic macromolecular reversible addition fragmentation chain transfer reagent (1) is stirred and dissolved in 150 parts by weight of water to form a water phase, and then poured together with the oil phase composed of 80 parts by weight of St Stir to mix in the reactor. Raise the temperature of the reactor to 70°C, keep stirring, add 0.06 parts by weight of ammonium persulfate after passing nitrogen for 30 minutes, and react for 2.5 hours to obtain X-AA n1 -b-St n2 -b-St n3 -R polymer latex.

[0051] The second step: after the first step reaction, add 150 parts by weight of IP monomer and 50 parts by weight of Bd monomer, the reaction temperature is 60 ° C, and X-AA is obtained after 4 hours of reaction n1 -b-St n2 -b-St n3 -b-(IP-co-Bd) n4 -R block copolymer latex.

[0052] The third step: After the second step reaction, add 80 parts by weight of St monomer, the reaction temperature is 70°C, and X-AA is obtained a...

Embodiment 2

[0056] The first step: 4.5 parts by weight of the amphiphilic macromolecular reversible addition fragmentation chain transfer reagent (1) is stirred and dissolved in 100 parts by weight of water to form a water phase, and then poured into the oil phase together with 35 parts by weight of St Stir to mix in the reactor. Raise the temperature of the reactor to 70°C, keep stirring, add 0.12 parts by weight of ammonium persulfate after 30 minutes of nitrogen gas, and react for 2 hours to obtain X-AA n1 -b-St n2 -b-St n3 -R polymer latex.

[0057] The second step: after the first step of reaction, add 200 parts by weight of IP monomer and 180 parts by weight of Bd monomer, the reaction temperature is 70 ° C, and X-AA is obtained after 8 hours of reaction n1 -b-St n2 -b-St n3 -b-(IP-co-Bd) n4 -R block copolymer latex.

[0058] The third step: After the second step reaction is completed, add 35 parts by weight of St monomer, the reaction temperature is 70°C, and X-AA is obtaine...

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Abstract

The invention discloses a poly((meth)acrylic acid-b-styrene-b-(isoprene-co-butadiene)-b-styrene) block copolymer latex and its preparation method, by adding Styrene monomer, isoprene and butadiene mixed monomer, styrene monomer, undergo reversible addition and fragmentation chain transfer emulsion polymerization, and obtain a random copolymer of isoprene and butadiene as a soft segment , Styrene homopolymer as the hard block copolymer latex. The process equipment of the present invention is simple, the process is environmentally friendly and energy-saving, which not only realizes good control of monomer polymerization, but also avoids the use of traditional emulsifiers; the growth of process colloids and polymers is stable and controllable; poly((meth)acrylic acid- b-styrene-b-(isoprene-co-butadiene)-b-styrene) block copolymer latex has great potential in the fields of asphalt modification, adhesives, water-based coatings, polymer modification, etc. application prospects.

Description

technical field [0001] The invention relates to a block copolymer material, in particular to a reversible addition-fragmentation chain transfer emulsion polymerization to prepare poly((meth)acrylic acid-b-styrene-b-(isoprene-co-butadiene )-b-styrene) block copolymer latex method. Background technique [0002] Styrene thermoplastic elastomer (TPS) has important applications in industry, including asphalt modification, adhesives, shoemaking, polymer toughening modification and many other aspects. Polystyrene-b-polybutadiene-b-polystyrene) triblock copolymer (SBS) and polystyrene-b-polyisoprene-b-polystyrene triblock copolymer (SIS ) and is one of the most important species. SBS has the characteristics of plasticizing at high temperature and showing the characteristics of rubber elastic body at room temperature. Due to the thermodynamic incompatibility of the polystyrene block / polybutadiene block, microphase separation occurs in the block copolymer, and the micro-domains of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F293/00C08F212/08C08F236/10C08F236/08C08F236/06
Inventor 高翔罗英武
Owner ZHEJIANG UNIV
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