A kind of low molecular weight styrene maleic anhydride copolymer and preparation method thereof
A technology of styrene maleic acid and low molecular weight, which is applied in the field of low molecular weight styrene maleic anhydride copolymer and its preparation, can solve the problems of dark color, difficult control of molecular weight, and difficult control of heat release, etc., and achieve the goal of copolymerization The effect of uniform molecular weight and uniform molecular weight
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[0042] The present invention also provides a kind of preparation method of above-mentioned low molecular weight styrene maleic anhydride copolymer, comprises the following steps:
[0043] S1. Adding the first solvent into the reaction vessel, blowing in nitrogen gas, and raising the temperature to a certain temperature; wherein, the mass of the first solvent is 20-50% of the mass of the monomer.
[0044] In a preferred embodiment of the present invention, the polymerization reaction is generally carried out in a four-neck flask equipped with a thermometer and mechanical stirring, so that the temperature can be controlled and stirred.
[0045] Further, in step S1, the temperature of the first solvent is raised to the corresponding temperature 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. Mixing the monomer, the second solvent and the i...
Embodiment 1
[0056] The present embodiment provides a kind of styrene maleic anhydride copolymer, is made according to the following steps:
[0057] Add 20 g of dipropylene glycol dimethyl ether into a 250 ml four-necked flask equipped with a mechanical stirrer, a condenser and a thermometer, raise the temperature to 110° C., and blow nitrogen. Mix 21g of styrene, 19.8g of maleic anhydride, 5g of oleic acid, 2g of dibenzoyl peroxide, and 35g of dipropylene glycol dimethyl ether evenly, and evenly drop them into the flask through a constant pressure funnel within 3.5 hours. After the addition is complete, keep warm for 0.5h, add 0.1g of dibenzoyl peroxide and 5g of dipropylene glycol dimethyl ether to mix, and keep warm for 2h. A pale yellow transparent solution was obtained.
Embodiment 2
[0059] The present embodiment provides a kind of styrene maleic anhydride copolymer, is made according to the following steps:
[0060] Add 20 g of propylene glycol methyl ether acetate into a 250 ml four-necked flask equipped with a mechanical stirrer, a condenser, and a thermometer, raise the temperature to 140° C., and blow nitrogen. 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 evenly drop them into the flask through a constant pressure funnel within 3.5 hours. After the dropwise addition, keep the temperature for 0.5h, add 0.1g of tert-butyl peroxybenzoate and 5g of propylene glycol methyl ether acetate and mix them, and keep the temperature for 2h. A pale yellow transparent solution was obtained.
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Abstract
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