Ethers polycarboxylic acid water reducing agent and preparation

A kind of ether polycarboxylate and preparation technology, applied in the field of ether polycarboxylate water reducer and its preparation technology, can solve the problems of difficult control of polymer molecular weight, increase of industrial production cost, low water reducing rate of concrete, etc. Achieve the effect of improving the performance of slump retention, easy control of reaction conditions, and good workability
CN101492518AInactive Publication Date: 2009-07-29杭州传化建筑新材料有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
杭州传化建筑新材料有限公司
Publication Date
2009-07-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an ether polycarboxylic water reducing agent which is obtained through water solution copolymerization of three types of monomers of 10-70 percent of allyl polyxyethylated alcohol ether, 20-70 percent of acrylic acid and 10-30 percent of hydroxy-ethyl acrylate. Due to the introduction of hydroxy-ethyl acrylate, the ether polycarboxylic water reducing agent reduces the self-polymerization proportion of the acrylic acid, improves the copolymerization proportion, and greatly reduces the cost of the raw materials; in addition, the molecular weight of the polymer is controllable, the water reduction rate is high, the loss of slump constant with the time is low, and the prepared concrete has high fluidity, good workability, and enough early strength in the beginning of hardening. Besides, the preparation technique of the ether polycarboxylic water reducing agent is a one-step method, the operation is simple, the reaction conditions are easy to control, the production period is short, and the ether polycarboxylic water reducing agent is green and environment-friendly, has low cost and is applicable to industrial production on large scale.
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Description

technical field

[0001] The invention relates to an ether polycarboxylate water reducer and a preparation process thereof, belonging to the technical field of concrete admixtures. Background technique

[0002] Concrete high-efficiency water reducer, also known as superplasticizer, mainly plays three different roles in concrete production: ① Improve the workability of concrete construction and facilitate mechanized operations without changing the concrete components; ② Under given conditions , reduce the mixing water and water-cement ratio to increase the strength of concrete and improve durability; ③Under a given workability, reduce the amount of water and cement, save cement, and reduce creep, shrinkage and cement hydration heat Thermal Stress.

[0003] Although traditional polycondensation-type superplasticizers such as naphthalene and melamine have good workability for fresh concrete, their dosage is high, and the slump loss over time is too large. Generally, multiple add...

Claims

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