Preparation method of delayed coagulation type ester polycarboxylate water reducing agent

An ester polycarboxylic acid, retarding technology, used in the field of building admixtures, can solve the problems of different components of the retarder in the standing time, excessive slump loss, affecting engineering construction, etc., and achieve excellent dispersibility. and slump retention, reducing negative effects, and easy operation

Active Publication Date: 2020-01-03
KZJ NEW MATERIALS GROUP CO LTD
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Problems solved by technology

[0003] Although the excellent water-reducing performance of polycarboxylate superplasticizers has been widely recognized by the industry, due to factors such as changes in cement, mud content in sand, and stone materials, polycarboxylate superplasticizers have also appeared in practical applications. Problems such as excessive slump loss and poor workability
For some concrete that is transported over long distances in summer and constructed in hot weather, compound retarders are often used to prolong the setting time. The retarder components contained in the layer superplasticizer are different, which will cause some problems of short or long setting time in the actual application process, which will affect the engineering construction. Water agent is of great significance

Method used

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  • Preparation method of delayed coagulation type ester polycarboxylate water reducing agent

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Embodiment 1

[0025] (1) Preparation of esterification monomer: by weight, 100 parts of glucose, 57 parts of crotonic acid, 0.8 part of supported solid acid catalyst SO 4 2- / SiO 2 -TiO 2 Add 2 parts of 4-tert-butylcatechol into the first reaction device equipped with a condensing device, under the protection of nitrogen, react at a constant temperature of 90 °C for 4 hours, after the reaction is completed, the temperature is lowered to 40 °C, and the sugar-containing product is obtained Esterification monomers of mixtures of esterification products and crotonic acid;

[0026] (2) Copolymerization reaction: by weight, first 5 parts of esterified monomers prepared in step (1), 1.5 parts of azobisisobutylamidine hydrochloride, 0.2 parts of manganese sulfate and 84 parts of water are added to the first In the second reaction device; 80 parts of molecular weight are 2400 polypropylene glycol di(meth)acrylate, 4 parts of acrylic acid hydroxypropyl phosphate, 8 parts of acrylic acid and 20 par...

Embodiment 2

[0029] (1) Preparation of esterification monomer: by weight, 100 parts of glucose, 70 parts of crotonic acid, 1.5 parts of supported solid acid catalyst SO 4 2- / SiO 2 -TiO 2 and 1.5 parts of 2,5-di-tert-butylhydroquinone were added to the first reaction device equipped with a condensing device, and under the protection of nitrogen, they were reacted at a constant temperature of 100°C for 6 hours, and after the reaction was completed, the temperature was lowered to 40°C. That is, the esterification monomer containing the mixture of sugar esterification products and crotonic acid is obtained;

[0030] (2) Copolymerization reaction: in parts by weight, first 8 parts of esterified monomers prepared in step (1), 3 parts of azobisisobutyronitrile, 0.2 parts of zinc chloride and 96 parts of water are added to the second reaction In the device; 80 parts of polytetramethylene glycol monomethacrylate with a molecular weight of 3000, 6 parts of acrylic acid hydroxypropyl phosphate, 9...

Embodiment 3

[0033] (1) Preparation of esterification monomer: by weight, 100 parts of sucrose, 50 parts of crotonic acid, 1.2 parts of supported solid acid catalyst SO 4 2- / SiO 2 -TiO 2 Add 0.5 parts of hydroquinone to the first reaction device equipped with a condensing device, under the protection of nitrogen, react at a constant temperature of 120 ° C for 6 hours, after the reaction is completed, the temperature is lowered to 40 ° C, and the sugar-containing esterification product is obtained Esterification monomer of mixture with crotonic acid;

[0034](2) Copolymerization reaction: by weight, first 12 parts of esterified monomers prepared in step (1), 2 parts of N, N'-dihydroxyethyl azobisisobutylamidine hydrochloride, 0.8 parts Zirconium chloride and 99 parts of water are added in the second reaction device; 80 parts of molecular weight are polyethylene glycol polypropylene glycol di(meth)acrylate of 5000, 3 parts of acryl phosphite, 10 parts of acrylic acid and 20 parts of wate...

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Abstract

The invention discloses a preparation method of a delayed coagulation type ester polycarboxylate water reducing agent. The preparation method comprises the following steps: (1) preparing an esterification monomer; (2) performing a copolymerization reaction; and (3) performing a neutralization reaction. The preparation method utilizes a saccharide compound and crotonic acid to prepare the esterification monomer, and has the advantages of low costs and simple and convenient operation; the prepared saccharide esterification product participates in the next step of the copolymerization reaction, so that the main chain of the polycarboxylate water reducing agent has a polyhydroxy structure, and the prepared polycarboxylate water reducing agent has a better delayed coagulation effect, effectively prolongs the initial setting and final setting time of cement, and can reduce negative effects caused by using a retarder; and the polyhydroxy structure of the saccharide compound enables the polycarboxylatewater reducing agent to have better slump loss resistance, so that the pumping construction of concrete in summer is facilitated.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to a preparation method of a retarding type ester polycarboxylate water reducer. Background technique [0002] With the construction of national large-scale infrastructure nuclear power, water conservancy, bridges and various large-scale projects, the performance requirements of concrete are constantly improving, which will inevitably lead to higher requirements for the performance of concrete admixtures. [0003] Although the excellent water-reducing performance of polycarboxylate superplasticizers has been widely recognized by the industry, due to factors such as changes in cement, mud content in sand, and stone materials, polycarboxylate superplasticizers have also appeared in practical applications. Problems such as excessive slump loss and poor workability. For some concrete that is transported over long distances in summer and constructed in hot weathe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F230/02C08F220/06C08F220/04C08F222/14C08F222/20C04B24/26C04B103/30
CPCC08F290/062C04B24/2694C04B2103/302C08F230/02C08F220/06C08F220/04C08F222/1006
Inventor 张小芳方云辉柯余良钟丽娜赖华珍
Owner KZJ NEW MATERIALS GROUP CO LTD
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