Process system for producing straw-starch modified biomass-polycarboxylate composite water reducer

Abstract

The invention discloses a process system for producing a straw-starch modified biomass-polycarboxylate composite water reducer. The production process system comprises the steps of primarily crushinga straw raw material, carrying out fine crushing, carrying out cleaning, carrying out drying, carrying out micro-crushing, carrying out hydrolysis pretreatment, carrying out primary and secondary oxidation-sulfonation esterification modification of a straw-starch mixture, carrying out hydroxymethylation-etherification modification and carrying out graft copolymerization modification. The compositeconcrete water reducer with comprehensive performance of a biomass-based water reducer and a polycarboxylate water reducer is easily synthesized through the production process system. The composite concrete water reducer has the characteristics of high water reducing rate and moderate retarding effect, so that continuous industrial production of compounding the biomass water reducer and the polycarboxylate water reducer can be realized, and the composite concrete water reducer has the characteristics of energy conservation, high efficiency and easy industrialization.

Description

technical field [0001] The invention relates to the technical field of concrete water reducer preparation, in particular to a process system for producing straw-starch modified biomass-polycarboxylic acid composite water reducer. Background technique [0002] At present, with the increasing shortage of petrochemical raw materials required for the preparation of a new generation of high-performance petroleum-based polycarboxylate water reducers for concrete admixtures, the outstanding problem of rising prices has restricted the new generation of high-performance polycarboxylate water reducers. The rapid development of additives has led to rising production costs, making polycarboxylate superplasticizers that have higher performance advantages than naphthalene-based, aliphatic-based, sulfamate-based, and lignin-based water-reducing agents unable to be used in the market. The vigorous promotion and application of the construction industry. Scholars at home and abroad have begu...

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Problems solved by technology

The water reducing agent prepared by this method has a low water reducing rate and can only be used as the most common water reducing agent

Chinese Patent CN 101759856B "Preparation Method of Sodium Lignosulfonate Water Reducer", using corncobs, corncob acid hydrolysis slag, bagasse or corn stalks as raw materials through alkali boiling black liquor, after coarse filtration, ultrafiltration membrane Concentrate, sulfonate and spray dry to prepare sodium lignosulfonate water reducer with low water content. This process has no pollution to the environment, simple process and low cost, but the raw material of straw cannot be fully utilized and the waste is serious

However, the results of these two studies are only small laboratory shake-flask experiments. First, the degree and method of crushing the straw are not proposed, only the straw crushing. Bringing in excess chloride ions and sulfate ions will affect the performance of the water reducer. Third, there is no idea and idea for industrial testing, and there is still a long way to go from industrial production equipment and production systems.

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