Polycarboxylic acid water reducing agent used for polyether with molecular weight of 1200 and preparation method of polycarboxylic acid water reducing agent

Abstract

The invention provides a polycarboxylic acid water reducing agent used for a polyether with a molecular weight of 1200 and a preparation method of the polycarboxylic acid water reducing agent. The polycarboxylic acid water reducing agent comprises the following components in parts by weight: 310-330 parts of a polyether macromonomer with a molecular weight of 1200, 4-14 parts of acrylic acid, 2-9parts of a carboxylate monomer, 2-5 parts of a fluoro functional monomer, 0.9-1.8 parts of hydrogen peroxide, 4-10 parts of a flexible chain monomer, 0.32-0.5 part of a reducing agent, 0.3-0.7 part ofa chain transfer agent, 6-10 parts of a neutralizing agent, and the balance water, wherein a total mass is 1000 parts, and after preparation is performed, a mass fraction of a finished product is 40%, and an acid-ether ratio is 2.7-3.3. The method is performed according to the following steps: 1, material addition for the first time; 2, addition of the hydrogen peroxide; 3, addition of a solutionA and a solution B; and 4, preparation of the finished product. The polycarboxylic acid water reducing agent and method provided by the invention adopt the polyether monomer with the molecular weightof 1200 as a raw material to obtain a suitable side-chain length which can be stretched in the environment, and the problem of weaken steric hindrance brought by a short side chain is compensated.

Description

Technical field: [0001] The invention relates to the technical field of building materials and polycarboxylic acid water reducer, and particularly relates to a polycarboxylic acid water reducer for 1200 molecular weight polyether and a preparation method. Background technique: [0002] As the third-generation high-performance water-reducing agent, polycarboxylic acid water-reducing agent has excellent performance in concrete applications. However, due to the differences in the regional types of sand and gravel materials, ordinary polycarboxylic acid water-reducing agents are often unable to take care of it. Especially as the use of raw materials with large powder content such as machine-made sand continues to expand, there is an urgent need for a suitable one. The situation of the new polycarboxylic acid water reducer is supplemented. [0003] Ordinary polycarboxylate water-reducing agent when there are more fine powders, the extension of the side chain is inhibited, the steric hi...

AI Technical Summary

Problems solved by technology

However, due to the differences in the types of sand and gravel materials in different regions, ordinary polycarboxylate superplasticizers are often unable to take care of both. Especially with the continuous expansion of the use of raw materials with large powder content such as machine-made sand, there is an urgent need for a suitable A new type of polycarboxylate superplasticizer to supplement the situation

[0003] When the ordinary polycarboxylate superplasticizer has a lot of fine powder, the stretching of the side chain is inhibited, and the steric hindrance effect is limited. On the concrete, the water reducing rate is not high, and the encapsulation and slump retention are relatively poor. Poor, it is difficult to ensure the working performance of pumping and pouring