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Preparation method of polystyrene-b-polybutadiene segmented copolymer nanometer latex

A polybutadiene block and polystyrene technology, applied in the field of polymers, can solve the problems of limiting the application of SBS, inability to introduce polar groups in situ, etc., and achieve the effects of large molecular weight, low pollution and high polymerization rate

Active Publication Date: 2014-01-29
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In addition, under mild conditions, the anionic solution polymerization process cannot introduce polar groups in situ, which limits the application of SBS in many fields.

Method used

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  • Preparation method of polystyrene-b-polybutadiene segmented copolymer nanometer latex
  • Preparation method of polystyrene-b-polybutadiene segmented copolymer nanometer latex
  • Preparation method of polystyrene-b-polybutadiene segmented copolymer nanometer latex

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preparation example Construction

[0018] The preparation method of polystyrene-b-polybutadiene block copolymer nano latex of the present invention comprises the steps:

[0019] Add 0.5-10 parts by weight of amphiphilic macromolecular emulsifier to 40-100 parts by weight of water to form a water phase; mix 5-20 parts by weight of styrene and 0.02-1 part by weight of a reversible addition-fragmentation chain transfer reagent , to form an oil phase; after fully mixing the water phase and the oil phase, move it into the reactor, pass nitrogen gas and exhaust oxygen for 30-60 minutes while stirring, heat up to 50-80°C, add 0.005-0.5 parts by weight of the initiator, and initiate polymerization After 10 to 60 minutes, add 0.05 to 1.5 parts by weight of sodium hydroxide, after 0.5 to 5 hours of polymerization, add 1 to 80 parts by weight of butadiene, polymerize for 1 to 15 hours, cool and discharge, add 0.01 to 0.5 parts by weight Terminator hydroquinone.

[0020] The general chemical structure formula of the rever...

Embodiment 1

[0034] Add 0.5 parts by weight of amphiphilic macromolecular emulsifier to 40 parts by weight of water to form a water phase; 5 parts by weight of styrene and 0.1 parts by weight of RAFT1 to form an oil phase; after fully mixing the water and oil phases, Move it into the reactor, pass nitrogen gas and exhaust oxygen for 30 minutes while stirring, heat up to 80°C, add 0.01 parts by weight of potassium persulfate, initiate polymerization for 20 minutes, add 0.05 parts by weight of sodium hydroxide, and after polymerization for 1 hour, add 2.5 parts by weight part of butadiene, polymerized for 2 hours, cooled and discharged, and added 0.01 parts by weight of terminator hydroquinone to obtain latex with a block structure, its composition is as follows figure 1 SB1 in the nuclear magnetic spectrum, the polybutadiene in the copolymer has three configurations of cis-1,4 addition, trans-1,4 addition and 1,2 addition, the polybutadiene block The mass fraction is 32%, and the inside of th...

Embodiment 2

[0036] Add 1 part by weight of amphiphilic macromolecular emulsifier to 50 parts by weight of water to form a water phase; mix 10 parts by weight of styrene and 0.2 parts by weight of RAFT2 to form an oil phase; fully mix the water phase and the oil phase , moved into the reactor, passed nitrogen gas and deoxygenated for 60 minutes while stirring, heated up to 70°C, added 0.02 parts by weight of potassium persulfate, initiated polymerization for 30 minutes, added 0.1 parts by weight of sodium hydroxide, and added 8 parts by weight after polymerization for 30 minutes. The butadiene of weight part, polymerize 5 hours, cool discharge, add 0.1 weight part terminator hydroquinone, can obtain the latex with block structure, its composition is as follows figure 1 SB2 in the nuclear magnetic spectrum, the polybutadiene in the copolymer has three configurations: cis-1,4 addition, trans-1,4 addition and 1,2 addition, the polybutadiene block The mass fraction is 42%, and the interior of ...

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Abstract

The invention discloses polystyrene-b-polybutadiene segmented copolymer nanometer latex and a preparation method of the Polystyrene-b-polybutadiene segmented copolymer nanometer latex. The preparation method comprises adding styrene and bivinyl monomer through a sequence and carrying out reversible addition fragmentation chain transfer emulsion polymerization so as to directly obtain stable polystyrene-b-polybutadiene segmented copolymer latex, wherein the latex particle has an average size of 50-200nm and is formed by regulating segments to change the micro-phase shape in the nanometer particle. The preparation method is simple, environment-friendly and energy-saving. The polystyrene-b-polybutadiene segmented copolymer nanometer latex has great application prospect in the fields of water paint, adhesives and polymer modification.

Description

technical field [0001] The invention relates to the technical field of polymers, in particular to a polystyrene-b-polybutadiene block copolymer nano latex and a preparation method thereof. Background technique [0002] Polystyrene-b-polybutadiene block copolymer latex can be used as emulsified asphalt modifier, impact modifier, etc. In the prior art, the polystyrene-b-polybutadiene block copolymer bulk material is usually prepared into micron-sized particles by a high-shear approach, and an emulsifier is used to stabilize the preparation. The preparation of polystyrene-b-polybutadiene block copolymer bulk materials adopts anionic solution polymerization process, by sequentially adding monomers, adjusting polymerization temperature, initiating system, solvent, coupling agent and other means to control the block The structure of the copolymer. Anionic solution polymerization uses organometallic catalysts, the polymerization conditions are extremely harsh, and a large amount ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F293/00C08F236/10C08F2/30C08F2/38C08J3/03
Inventor 魏任重高翔罗英武
Owner ZHEJIANG UNIV
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