Low molecular weight styrene maleic anhydride copolymer and preparation method thereof

A technology of styrene maleic acid and low molecular weight, applied in the field of low molecular weight styrene maleic anhydride copolymer and its preparation, can solve the problems of deep color, difficult control of molecular weight, and difficult control of heat release, etc., and achieve uniform molecular weight , The effect of uniform molecular weight of the copolymer

Active Publication Date: 2019-04-05
上海深竹化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of living polymerization is that the preparation of RAFT reagent is complicated, and at the same time, due to the introduction of sulfur-containing compounds, the color is darker under low molecular weight conditions
[0007] Shi Zhengjin etc. disclose a kind of preparation method of styrene-maleic anhydride random copolymer in patent CN1130401C, this method is by putting styrene, maleic anhydride and a small amount of styrene copolymer into the reactor, then dropwise adding styrene The molecular weight of this method is not easy to control, and at the same time, due to the one-pot input, the heat release is not easy to control

Method used

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Examples

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preparation example Construction

[0042] The present invention also provides a method for preparing the aforementioned low molecular weight styrene maleic anhydride copolymer, which includes the following steps:

[0043] S1. The first solvent is added to the reaction vessel, nitrogen is introduced, and the temperature is raised to a certain temperature; wherein the mass of the first solvent is 20-50% of the mass of the monomer.

[0044] In the preferred embodiment of the present invention, the polymerization reaction is generally carried out in a four-necked flask with a thermometer and mechanical stirring, which is convenient for temperature control and stirring.

[0045] Further, in step S1, the first solvent is heated to a temperature corresponding to when the half-life of the initiator is 30-60 min. According to known techniques, the polymerization temperature is determined by the decomposition temperature of the initiator.

[0046] S2. Mix the monomer, the second solvent, and the initiator to obtain a mixed solut...

Embodiment 1

[0056] This embodiment provides a styrene maleic anhydride copolymer, which is prepared according to the following steps:

[0057] Add 20g of dipropylene glycol dimethyl ether into a 250ml four-necked flask equipped with mechanical stirring, condenser and thermometer. The temperature is raised to 110°C and nitrogen is introduced. Mix 21g of styrene, 19.8g of maleic anhydride, 5g of oleic acid, 2g of dibenzoyl peroxide, and 35g of dipropylene glycol dimethyl ether, pass through a constant pressure funnel, and add them to the flask evenly within 3.5 hours. After the addition is completed, keep it for 0.5h, add 0.1g of dibenzoyl peroxide and 5g of dipropylene glycol dimethyl ether to mix, keep for 2h. A light yellow transparent solution was obtained.

Embodiment 2

[0059] This embodiment provides a styrene maleic anhydride copolymer, which is prepared according to the following steps:

[0060] Add 20g of propylene glycol methyl ether acetate into a 250ml four-necked flask equipped with mechanical stirring, condenser and thermometer. The temperature is raised to 140°C and nitrogen is introduced. Mix 21g of styrene, 19.8g of maleic anhydride, 5g of palmitic acid, 2g of tert-butyl peroxybenzoate, and 35g of propylene glycol methyl ether acetate, and add them to the flask evenly through a constant pressure funnel within 3.5 hours. After the dripping is completed, keep it for 0.5h, add 0.1g of tert-butyl peroxybenzoate and 5g of propylene glycol methyl ether acetate, and mix it for 2h. A light yellow transparent solution was obtained.

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Abstract

The invention provides a low molecular weight styrene maleic anhydride copolymer and a preparation method thereof, and relates to the field of polymer material synthesis. The copolymer is obtained byfree radical copolymerization of monomers, and the monomers comprise the following components according to the mole fraction: 45-50% of styrene; 45-50% maleic anhydride; 5-10% of C12-C18 monounsaturated fatty acids; and 0-5% of unsaturated monomers, wherein the unsaturated monomers do not comprise styrene, maleic anhydride and C12-C18 monounsaturated fatty acids. The invention further provides a preparation method of the copolymer. The copolymer has the characteristics of light color, high acid value, low molecular weight and uniform structure, and can be respectively used as a surface sizingagent, an organic pigment dispersant, an emulsion polymerization protective colloid, a photoresist and the like of paper in the industries of papermaking, textile, printing and dyeing, coating, chemical industry, photoelectricity and the like.

Description

Technical field [0001] The invention relates to the field of polymer material synthesis, and particularly relates to a low molecular weight styrene maleic anhydride copolymer and a preparation method thereof. Background technique [0002] Styrene maleic anhydride copolymer (SMA) and its derivatives are widely used in many aspects due to its cheap and easy availability and many unique properties. For example, in environmental treatment, it is used for the adsorption of divalent copper ions, divalent cadmium ions, divalent nickel ions, and the recovery of rare earths; in the field of biomedicine, it is used as a vehicle for cancer drug delivery, tumor treatment and imaging , Intracellular gene transfer, immobilization of enzymes, etc.; in terms of new materials, it can be used in functional graphene modification, new dispersants and emulsifiers, phase change energy storage materials and urea-formaldehyde resin modification. [0003] In the new electronic industry, photoresist produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F222/06C08F220/64
CPCC08F212/08C08F222/06C08F220/64
Inventor 罗菊香程德书柳靖龙欣
Owner 上海深竹化工科技有限公司
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