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A kind of aqueous phase preparation method of maleic anhydride-conjugated diene copolymer

A technology of maleic anhydride and conjugated diene, which is applied in the field of aqueous phase preparation of maleic anhydride-conjugated diene copolymer, can solve the problems of environmental and human health impact, pollution and toxicity, and improve the reaction Efficiency, the effect of improving the induction efficiency

Active Publication Date: 2020-12-15
TIANJIN ANHAO PHARMATECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] All of the above use organic solvents as the reaction medium, which is relatively polluting and toxic, and will have a great impact on the environment and human health.

Method used

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  • A kind of aqueous phase preparation method of maleic anhydride-conjugated diene copolymer
  • A kind of aqueous phase preparation method of maleic anhydride-conjugated diene copolymer
  • A kind of aqueous phase preparation method of maleic anhydride-conjugated diene copolymer

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Experimental program
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Embodiment 1

[0036]

[0037] Add 9.806g maleic anhydride, 0.304g RAFT-1, 0.108g N,N-dimethylethanolamine and 40.000g distilled water into the reactor and stir to dissolve; heat up to 60°C, slowly add 5.409g isoprene and 0.304 g ammonium persulfate initiator, stirred at a constant speed; after the dropwise addition, the temperature was raised to 95-100°C to continue the reaction for 2 hours; the temperature was lowered to room temperature, and the pH was adjusted to neutral with alkali to obtain an aqueous solution of maleic anhydride-isoprene copolymer. The viscosity average molecular weight is 19700, and the molecular weight distribution is 2.0.

Embodiment 2

[0039]

[0040] Add 9.806g maleic anhydride, 0.304g RAFT-5, 0.108g N,N-dimethylethanolamine and 40.000g distilled water into the reactor and stir to dissolve; heat up to 65°C, slowly add 5.409g isoprene and 0.304 g ammonium persulfate initiator, stirred at a constant speed; after the dropwise addition, the temperature was raised to 95-100°C to continue the reaction for 2 hours; the temperature was lowered to room temperature, and the pH was adjusted to neutral with alkali to obtain an aqueous solution of maleic anhydride-isoprene copolymer. The viscosity average molecular weight is 18000, and the molecular weight distribution is 1.8.

Embodiment 3

[0042]

[0043] Add 9.806g maleic anhydride, 0.304g RAFT-1, 0.108g pentaerythritol triacrylate and 40.000g distilled water into the reactor and stir to dissolve; heat up to 70°C, slowly add 5.409g isoprene and 0.304g ammonium persulfate Initiator, stir at a constant speed; after the dropwise addition, raise the temperature to 95-100°C to continue the reaction for 2 hours; cool down to room temperature, adjust the pH to neutral with alkali, and obtain an aqueous solution of maleic anhydride-isoprene copolymer with a viscosity-average molecular weight of 18,500 , molecular weight distribution 1.7.

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Abstract

The invention provides an aqueous phase preparation method of a maleic anhydride-conjugated diene copolymer. The aqueous phase preparation method comprises the following steps: S1, stirring and dissolving maleic anhydride, an RAFT reagent, a cross-linking agent and water according to the quantity of a formula to obtain a mixed solution; S2, heating and warming the mixed solution to 60 to 80 DEG C,dropwise adding a conjugated diene copolymer monomer and an initiator into the mixed solution, and stirring at a constant speed; S3, after the conjugated diene copolymer monomer and the initiator areadded dropwise in the step S2, warming the solution system to 85 to 110 DEG C, and continuously reacting for 1.5 to 3 h; and S4, cooling the temperature of the system after the reaction in the step S3 to room temperature, using alkaline to adjust the pH until neutral to obtain a maleic anhydride-conjugated diene copolymer aqueous solution. According to the aqueous phase preparation method of themaleic anhydride-conjugated diene copolymer provided by the invention, water is used for taking the place of an organic solvent as a reaction medium, the preparation method is green and environmentally-friendly, and the obtained copolymer aqueous solution can be directly used in the fields of water paints, water pigments and the like.

Description

technical field [0001] The invention belongs to the field of organic polymer synthesis, and in particular relates to a water phase preparation method of a maleic anhydride-conjugated diene copolymer. Background technique [0002] Maleic anhydride-conjugated diene copolymer is an important water-soluble polymer material, which is widely used in the fields of coatings, pigments, adhesives and rubber plastics. [0003] At present, the preparation methods of maleic anhydride-conjugated diene copolymers are mainly free radical polymerization and coordination polymerization, wherein free radical polymerization is currently the main method for preparing maleic anhydride-conjugated diene. B.C.Trivedi et al. used cyclohexanone as a solvent in "MaleicAhydride" and reacted at 80°C to obtain an alternating copolymer of maleic anhydride-isoprene with a high cis 1,4-structure. [0004] Hu Zhiguo et al. used Nd(naph) in "rare earth catalyzed isoprene-maleic anhydride alternating 3 -AlEt ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F222/06C08F236/14C08F4/34C08F2/10C08F2/38
CPCC08F2/10C08F2/38C08F4/34C08F222/06C08F2438/03C08F236/14
Inventor 杨晴於兵曹育才叶晓峰
Owner TIANJIN ANHAO PHARMATECH CO LTD
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