A kind of preparation method of solid polycarboxylate water reducer

Abstract

The invention discloses a preparation method of a solid polycarboxylate water reducer, comprising the following steps: (1) adding unsaturated polyether monomers and unsaturated sulfonic acid monomers into a reaction kettle, and raising the temperature to 50-80°C , make it in a molten state, then add the catalyzer at one time, and stir evenly; (2) drop respectively the first mixed solution composed of unsaturated carboxylic acid monomer and initiator in the material obtained in step (1) and the mixture composed of The second mixed solution composed of unsaturated phosphate ester monomer and chain transfer agent is dripped for 1-3 hours. After the addition is completed, it is aged for 0.8-1.2 hours, and then solid sodium hydroxide is added for neutralization; (3) Finally, condensation is used to A slicer slices the material obtained in step (2) to obtain the solid polycarboxylate water reducer in the form of white flakes. The solid polycarboxylate water-reducer prepared by the invention has excellent water-reducing and dispersing effects, and can still show good fluidity and retention ability at a lower dosage, and shows strong adaptability to different types of cement sex.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to a preparation method of a solid polycarboxylate water reducer. Background technique [0002] As the fifth component of modern concrete, polycarboxylate superplasticizer has been widely used in the field of concrete engineering technology due to its excellent low dosage, high slump retention, and large degree of freedom in molecular design. At present, most widely used polycarboxylate superplasticizers are solution products with a concentration of 10-50%. Due to the remote distance of some construction sites, the lower solid content will increase the transportation cost; in addition, the wide application of dry powder mortar also puts forward an urgent demand for the production and application of solid polycarboxylate water reducer. At present, most of the powder polycarboxylate water-reducers on the market are obtained by spray drying, but when they are d...

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Problems solved by technology

However, this patent requires the use of organic solvents such as alcohols, aromatic hydrocarbons, aliphatic hydrocarbons, esters, etc. After obtaining the polymerized product, it is necessary to dry and separate the solvent, and the production process is not green enough.

[0005] At present, the preparation of solid polycarboxylate superplasticizers is high in preparation cost, expensive in equipment, and high in energy consumption. The effect of water reduction is affected to a certain extent

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