Styrene-maleic anhydride grafted polyethylene glycol and preparation method thereof

A technology of grafting polyethylene glycol and maleic anhydride, which is applied in the preparation of polymers and the field of polycarboxylic acid-based water reducers, which can solve the problem of reduced effect of water reducers, difficulty in controlling the distribution of branched chains, and the reduction of water reducers. effect and other issues to achieve the effect of improving utilization

Inactive Publication Date: 2014-02-12
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned methods are all deficient. It is difficult to control the distribution of branched chains on the polymer, and it appears as a random or block copolymer, which reduces the effect of the water reducing agent.
Moreover, since the carboxyl group an

Method used

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  • Styrene-maleic anhydride grafted polyethylene glycol and preparation method thereof
  • Styrene-maleic anhydride grafted polyethylene glycol and preparation method thereof
  • Styrene-maleic anhydride grafted polyethylene glycol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Example 2:

[0054] (1) Slowly add 4.4ml of lyre and 6g of Malaysic acid anhydride solution to 70ml toluene, slowly add it to the reactor, and heated slowly. When the temperature rises to 90 ° C, the 30ml 0.005g oxidation benzohydraxidyl -dioxide solutionSlowly drip into the reactor, the titration time is 1h, the reaction temperature is 90 ± 1 ℃, and the reaction time is 7h.After the reaction is over, use toluene and petroleum ether mixed solutions to washed and refined solid powder. By decompression filtering, white powder is obtained, and SMA will be refined, and at 80 ° C, the decompression is dry for 10h.Get the SMA with the average molecular weight of 410.

[0055] (2) Under 50 ° C, dissolve the refined SMA at 1 w Among the % concentrated sulfuric acid solution, it is acidified, the treatment time is 2H, and the polymer obtained by the decompression is filtered with a 75ml 0.9g zinc chloride, 2ml dichlogenne, and 2ml dichloroethylene solution to add the reactor.Slowly ...

Embodiment 2

[0057] Example 3:

[0058] (1) Slowly add 5.5ml styrene and 5.2g Malayanine solution solution in 70ml toluene slowly added to the reactor and heat it slowly. When the temperature rises to 90 ° C, the 30ml of 0.029g peroxide oxide is theThe solution is slowly drip into the reactor, the titration time is 30min, the reaction temperature is 90 ± 1 ℃, and the reaction time is 8H.After the reaction is over, use toluene and petroleum ether mixed solutions to washed and refined solid powder. The white powder is obtained by decompression filtering, that is, refined SMA, and at 80 ° C, the decompression is dry for 24 hours.Get the SMA with the average molecular weight of 360.

[0059] (2) Under 50 ° C, the refined SMA is dissolved in a 1W % concentrated sulfate solution for acidification treatment, the treatment time is 2H, and the polymer obtained by the decompression is filtered.The solution is added to the reactor together, slowly heating to 50 ° C, the reaction temperature is 60 ± 1 ° C...

Embodiment 3

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Abstract

The invention relates to styrene-maleic anhydride grafted polyethylene glycol and preparation method thereof. The preparation method comprises the following steps: with styrene and maleic anhydride as comonomers, synthesizing a styrene-maleic anhydride copolymer under the action of benzoyl peroxide; with the styrene-maleic anhydride copolymer as a substrate for chloromethylation reaction, introducing a reactive group onto a phenyl ring in a carbon chain of the polymer through the chloromethylation reaction; synthesizing the styrene-maleic anhydride grafted polyethylene glycol though nucleophilic substitution reaction of polyethylene glycol and chloromethyl. The preparation method is mild in reaction conditions, short in reaction time and high in yield.

Description

Technical field [0001] The present invention involves a composite synthesis of a styrene-Malayic anhydride closure of polyethylene glycol, which can be used as a polycarboxylic acid water reduction agent. The invention also involves the preparation method of this polymer. Background technique [0002] In recent years, the superior performance of a new high -efficiency water reduction agent represented by polycarboxylic acid system has been widely recognized internationally.After incorporating a polycar carboxylic acid reducing agent in the concrete, many properties of cement slurry, such as micro structure, pore rate, adsorption, hardening speed, strength, etc. will change. At the same timeSome performance will also be affected.In terms of structural characteristics, a polycarboxylic acid water reducing agent is completely different from the traditional sulfonal formaldehyde shrimp or sulfide melamine formaldehyde contraction.The main chain of the polymerization of water is mainl...

Claims

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Application Information

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IPC IPC(8): C08G81/02C08F212/08C08F222/08C08F8/24
Inventor 李继新王海玥郭丽颖刘金麟
Owner SHENYANG POLYTECHNIC UNIV
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