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A kind of preparation method of retarding type ester polycarboxylate water reducer

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, too fast slump loss, and short setting time, etc., and achieve excellent dispersion. performance and slump retention, reducing negative effects, prolonging initial and final setting times

Active Publication Date: 2022-02-22
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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  • A kind of preparation method of retarding type ester polycarboxylate water reducer

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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, and react at a constant temperature of 120°C for 6 hours under the protection of nitrogen. 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 water...

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Abstract

The invention discloses a preparation method of a retarding type ester polycarboxylate water reducer, which comprises the following steps: (1) preparation of esterified monomers; (2) copolymerization reaction; (3) neutralization reaction. The preparation method of the present invention utilizes sugar compounds and crotonic acid to carry out esterification to prepare esterification monomers, which has the advantages of low cost and easy operation, and the prepared sugar esterification products participate in the next step of copolymerization reaction, making polycarboxylic acid The main chain of the superplasticizer has a polyhydroxyl structure, so that the prepared polycarboxylate superplasticizer has a good retarding effect, effectively prolonging the initial setting and final setting time of cement, and reducing the use of retarders. negative impact. Moreover, the polyhydroxy structure of sugar compounds makes the polycarboxylate superplasticizer have better slump retention performance, which is beneficial to the summer pumping construction of concrete.

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 Patents(China)
IPC IPC(8): C08F290/06C08F230/02C08F220/06C08F220/04C08F222/14C08F222/20C04B24/26C04B103/30
CPCC08F290/062C04B24/2694C04B2103/302
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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