Ether polycarboxylate superplasticizer and preparation method thereof

Abstract

The invention discloses an ether polycarboxylate superplasticizer and a preparation method thereof. The ether polycarboxylate superplasticizer is prepared from the following components in parts by weight: 100 parts of modified polyether monomer having the molecular weight in the range of 3000 to 3500, 6-17 parts of unsaturated acid, 0.3-5.0 parts of oxidizing agent, 0.1-1.0 part of reducing agent, 0.3-1.0 part of chain transfer agent, 6-14 parts of sodium hydroxide having the mass concentration of 32% and 90-200 parts of water. The preparation method of the ether polycarboxylate superplasticizer has the advantages that the temperature of the system rises when the oxidizing agent is added once, and in the later period, the temperature of the system also rises due to heat released by polymerization when the unsaturated acid solution and the composite solution of the reducing agent and the chain transfer agent are added dropwise; and in other words, the preparation method is capable of realizing spontaneous heating, and is relatively low in requirements on the equipment and the conditions of industrial production, capable of reducing the energy consumption and improving the production efficiency during production, and economic and environment-friendly. The modified polyether monomer having the molecular weight in the range of 3000 to 3500 is adopted for the ether polycarboxylate superplasticizer so that the length of the side chain is increased, and therefore, the early hydration of a cement dispersion system can be increased and the slump retaining property of the cement dispersion system can be improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an ether polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizers on the market today are mainly divided into two types: esters and ethers. The synthesis process of esters is relatively complicated, while ether products use a one-step synthesis method. Because of their relatively simple process, they occupy a large market share. Larger proportional share. [0003] In the application process of commercial concrete, one of the most common and main problems is the loss of concrete slump, especially for pumped concrete. This problem is more prominent in high temperature and hot weather conditions. At present, the industry mainly solves the problem of concrete slump damage through methods such as post-mixing of water reducing agents, combined use with retarders, and lowering the concrete exi...

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Problems solved by technology

This process requires an external heat source, and there is also the problem of excessive loss of slump over time

[0005] CN103508696A discloses a polycarboxylic acid anti-mud superplasticizer and its preparation method. The dropping temperature during reaction is 35-45°C, and the temperature during heat preservation is 40-80°C. Two-stage temperature control is required. In the process, the time and energy consumption caused by the high temperature control requirements reduces the production efficiency of the product and ultimately makes the cost higher

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