Preparation method and device of sulfonation-hydroxymethylation modified straw-based water reducing agent

Abstract

The invention relates to a preparation method and device of a sulfonation-hydroxymethylation modified straw-based water reducing agent, relates to the method and the equipment for preparing the straw-based biomass water reducing agent through modification, and aims at preparing the biomass water reducing agent through pretreatment and sulfonation-hydroxymethylation modification of a straw raw material. The preparation method comprises two parts of straw raw material pretreatment and sulfonation-hydroxymethylation modification, wherein the straw pretreatment comprises the processes of primary crushing, cleaning, drying, secondary crushing, micro-crushing and hydrolysis; the sulfonation-hydroxymethylation modification is composed of material oxidation chain scission, sulfonation modification, alkalization and hydroxymethylation modification. The used equipment comprises a primary crushing device, a cleaning device, a drying device, a cyclone separator, a secondary crushing device, a micro-crushing device, an aggregate bin weighing device, a screw extrusion hydrolyzer, a batching storage tank, a screw extrusion modification reaction unit and a storage tank. The method is used for preparing the straw-based biomass water reducing agent.

Description

technical field [0001] The invention relates to a method and a device for preparing a straw-based biomass water reducer through modification, in particular to a method and a device for preparing a straw-based water reducer modified by sulfonation-methylolation. 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 superplasticizers for concrete admixtures, the price has been rising all the way and the gradual depletion of high-quality concrete aggregates has forced the use of mud content. The prominent problem of high-quality and low-quality sand and gravel aggregates restricts the rapid development of a new generation of high-performance polycarboxylate superplasticizers, making its production costs continue to rise and the high content of sand and gravel in concrete. The loss of "high performance" such as high water reduction,...

AI Technical Summary

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 101759856 B "Preparation Method of Sodium Lignosulfonate Water Reducer", using corn cob, corn cob acid hydrolysis residue, bagasse or corn stalks as raw materials to produce black liquor after alkali boiling, after coarse filtration and ultrafiltration Membrane concentration, sulfonation and spray drying to prepare sodium lignosulfonate superplasticizer with low water content. This process has no pollution to the environment, simple process and low cost, but straw raw materials 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.

[0009] The direct modification of crop straws to prepare water reducers requires high requirements for the pretreatment method, modification method and corresponding equipment of straw raw materials, which directly affects the performance of the subsequent straw-based water reducers. The key issues that must be considered in industrial production, otherwise the development and utilization value of new water reducers will not be achieved

However, the use of crop straws to directly prepare straw raw materials for water reducing agents, such as micro-crushing, hydrolysis pretreatment methods, and special equipment for sulfonation, has not yet been reported in this regard.

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