Polycarboxylic acid type concrete water reducer with maleic anhydride residues as raw materials and preparation method of polycarboxylic acid type concrete water reducer

Abstract

The invention relates to the field of concrete additives and specifically relates to a polycarboxylic acid type concrete water reducer with maleic anhydride residues as raw materials and a preparation method of the polycarboxylic acid type concrete water reducer. The water reducer is prepared by a polymerization reaction of, by weight, 120-130 parts of allyl polyoxyethylene ether, 30-40 parts of maleic anhydride residues, 3-7 parts of chain transfer agents and 3-9 parts of initiating agents, wherein the maleic anhydride residues are crystals in waste residues and waster water which are produced in the process of maleic anhydride. The preparation method includes adding the allyl polyoxyethylene ether and the maleic anhydride residues into water according to an appropriate proportion, stirring a mixture and heating the mixture to 55 DEG C-65 DEG C, then adding the chain transfer agents and the initiating agents, subjecting the mixture to two-step heating, performing the polymerization reaction, and subjecting the mixture to cooling and PH value adjusting to obtain the water reducer. According to the polycarboxylic acid type concrete water reducer with the maleic anhydride residues as the raw materials and the preparation method of the polycarboxylic acid type concrete water reducer, the zero discharge of the maleic anhydride waste residues is achieved, the cost of the polycarboxylic acid water reducer is reduced, the maleic anhydride residues are recycled, useful components in the waste residues can be utilized to the maximum, the greening production of the maleic anhydride is achieved, and good social and economic benefits are achieved.

Description

technical field [0001] The invention relates to the field of concrete additives, in particular to a polycarboxylic acid-based concrete water reducer using maleic anhydride slag as a raw material and a preparation method thereof. Background technique [0002] The waste residue from the production of maleic anhydride is similar to soil in color and acidic. If it is discarded directly, it will bring great harm to the environment. The main components of maleic anhydride waste residue are maleic anhydride, maleic acid, fumaric acid and other small molecular acids. At present, one of the main ways of recycling maleic anhydride residue is to produce fumaric acid. The production of fumaric acid from maleic anhydride residue requires catalytic isomerization, decolorization, and regeneration of activated carbon. The process is cumbersome and complicated. , the processing cost is relatively high, and the oxidatively coupled substances contained in it are difficult to remove through th...

AI Technical Summary

Problems solved by technology

At present, one of the main ways of recycling maleic anhydride slag is to produce fumaric acid. The production of fumaric acid from maleic anhydride slag needs to go through processes such as catalytic isomerization, decolorization, and regeneration of activated carbon. The process is cumbersome and complicated. , the treatment cost is relatively high, and the oxidatively coupled species contained in it are difficult to remove through the decolorization process

Maleic anhydride slag is also used to produce esters such as dimethyl fumarate and succinic diester. Although the production of esters can recover high value-added products, it needs to be separated by distillation, which requires a large investment in equipment.

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