Low water-reducing and high slump loss resistant type polycarboxylate superplasticizer master batch

Abstract

The invention discloses a low water-reducing and high slump loss resistant type polycarboxylate superplasticizer master batch which is applicable to the condition that the quality of materials such as cement, mineral admixtures, flooring and the like is low and has the characteristic that the slump loss resistance is high in the middle and later periods of initial high water reduction. According to the limit of mass percent of 40% of mother solution, the total mass of the raw synthesis materials is 1000, and the dosage ratio is as follows: the dosage of a polyether macromonomer is 360-375; the dosage of acrylic acid is 22.0-35.0; if mercaptoacetic acid MSDS is selected as a chain transfer agent, the dosage is 1.25-1.65%; if mercaptopropionic acid MPA is selected as the chain transfer agent, the dosage is 1.37-1.80; if hydrogen peroxide serves as an oxidant, the dosage is 2.0-3.5; if vitamin C is selected as a reducing agent, the dosage is 0.55-0.75; the dosage of liquid caustic soda is 10-15; and the balance of water. The synthesized polycarboxylate superplasticizer has a moderate molecular weight of about 57000-62000; and the polycarboxylate superplasticizer master batch is moderate in main chain length, high in side chain density, low in water-reducing rate and high in slump loss resistance and has outstanding effects aiming at poor materials.

Description

technical field [0001] The invention belongs to the field of cement additives, and relates to a low-water-reducing and high-slump-preserving polycarboxylate superplasticizer masterbatch, which is suitable for poor-quality materials such as cement, mineral admixtures, and gravel floor materials. Background technique [0002] There are many factors in the process of concrete preparation that will affect the quality of concrete. The strength of the influencing factors is sandstone, cement, and mineral admixtures in order; with the excessive exhaustion of resources or the emergence of protection policies, the use of bad materials leads to the deterioration of fresh concrete. The slump loss is too large, which makes it more and more difficult for polycarboxylate-based water-reducers to be well applied in concrete; in the synthesis of water-reducers, water-reducing and slump-preserving are contradictory designs. The proportion cannot take both into consideration; the initial flow ...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a low-water-reducing and high-slump-retaining polycarboxylate superplasticizer masterbatch, which is suitable for poor quality materials such as cement, mineral admixtures, and gravel floor materials.