Low-surface tension hyperbranched shrinkage reduction type polycarboxylate superplasticizer and preparation method thereof

A low surface tension, polycarboxylate technology, applied in the field of construction admixtures, can solve the problems of small plastic shrinkage of high-strength concrete, insufficient reduction, increase early shrinkage and total shrinkage, etc., to achieve large steric hindrance and prevent shrinkage Effect of cracking and improving dispersion performance
CN110358024AActive Publication Date: 2019-10-22KZJ NEW MATERIALS GROUP CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
KZJ NEW MATERIALS GROUP CO LTD
Publication Date
2019-10-22

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Abstract

The invention relates to the technical field of building additives and in particular to a low-surface tension hyperbranched shrinkage reduction type polycarboxylate superplasticizer and a preparationmethod thereof. The preparation method comprises the following steps: putting an unsaturated polyether, a polyhydroxy polymer and a hyperbranched shrinkage reduction functional monomer and water intoa container, mixing at 20-60 DEG C, adding an initiator solution, a chain transfer agent solution and an unsaturated acid solution, keeping the temperature for a certain time, and adjusting the pH value of the obtained reaction product to 6.0-7.0 by using an alkali substance, thereby obtaining the low-surface tension hyperbranched shrinkage reduction type polycarboxylate superplasticizer. As a great amount of the shrinkage reduction functional monomer is introduced into a polycarboxylic acid molecular structure through copolymerization, the polycarboxylic acid molecular structure has a shrinkage reduction function chain segment, a steric hindrance segment and an adsorption group segment, the prepared superplasticizer product has low surface tension, unification of shrinkage reduction and dispersing performance of concrete can be achieved with a low doping amount, the concrete can be prevented from shrinkage cracking, then the durability of the concrete can be improved, and practical application values are great.
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Description

technical field

[0001] The invention relates to the technical field of building admixtures, in particular to a low surface tension hyperbranched shrinkage-reducing polycarboxylate water reducer and a preparation method thereof. Background technique

[0002] The brittleness and shrinkage of concrete are important factors affecting its performance. Shrinkage leads to cracks inside the concrete, which reduces the strength of the concrete and adversely affects its durability. According to survey results, from bridges, roads and other transportation facilities to coastal areas Seaport engineering structures, from civil buildings, commercial buildings to industrial buildings, are affected by cracking problems extremely widely. Therefore, reducing the shrinkage of concrete and controlling the internal defects of concrete are very important to improve the application performance of concrete.

[0003] How to reduce the shrinkage of concrete has become the focus of current engineerin...

Claims

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