Polycarboxylate superplasticizer and preparation method thereof

Abstract

The invention discloses a polycarboxylate superplasticizer and a preparation method thereof. The polycarboxylate superplasticizer is prepared from raw materials: by weight, 340-360 parts of methoxypolyethylene glycol, 20-40 parts of methacrylic acid, 2-10 parts of hydroxyalkyl acrylic ester, 2-6 parts of catalyst, 2-6 parts of polymerization inhibitor, 2-6 parts of oxidizing agent, 1-5 parts of reducing agent, 1-5 parts of tartaric acid and 640 parts of water. The preparation method of the polycarboxylate superplasticizer is carried out at the temperature ranging from 5 DEG C to 40 DEG C. According to the preparation method, the problem of low efficiency at temperature during use of one type of reducing agent can be avoided, dropwise adding time can be shortened, production cycle can be shortened, energy consumption can be lowered, and production cost can be decreased.

Description

technical field [0001] The invention belongs to the technical field of chemical building materials, and in particular relates to a polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Concrete water reducer is the most widely used concrete admixture, which can significantly improve the performance of concrete and is regarded as the fifth component of concrete. It has gone through three generations so far. The first generation is lignosulfonate ordinary water reducing agent, mainly using papermaking waste liquid cellulose as raw material, and the water reducing rate is lower, less than 10%; the second generation is mainly composed of β-naphthalenesulfonic acid formaldehyde condensate Naphthalene-based high-efficiency water-reducers are representative, and also include melamine-based water-reducers, sulfamic acid-based water-reducers and aliphatic high-efficiency water-reducers. The water-reducing rate can reach more than 20%. Cement ...

AI Technical Summary

Problems solved by technology

When configuring high-performance concrete, in order to improve the compactness, strength and durability of concrete, a better way is to reduce the water-binder ratio, but it will also cause certain problems. A low water-binder ratio will lead to an increase in the viscosity of the concrete. Poor rheology, difficult construction