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Preparation method of polycarboxylic acid water reducing agent with low sensitivity on mud content of concrete

A type of polycarboxylic acid and mud content technology, which is applied in the field of construction admixtures, can solve the problems of mud content sensitivity, etc., and achieve the effects of reducing sensitivity, improving shape and branched structure, and improving adaptability

Active Publication Date: 2018-06-22
KZJ NEW MATERIALS GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem that traditional polycarboxylate superplasticizer products are too sensitive to mud content has gradually been exposed, which has been greatly restricted in practical applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In parts by weight, 100 parts of 4-hydroxybutyl vinyl ether polyoxyethylene polyoxypropylene ether (wherein p=6, q=1), 0.1 part of 0.1mol / L chloroplatinic acid ethanol solution were added to the In the first reaction device of the condensation recovery device, nitrogen was filled while stirring for protection, the temperature was raised to 40°C, 0.0008 parts of triphenylphosphine was added, and then 10 parts of hydride-terminated poly(dimethylsiloxane) was added dropwise. ) (where n=4), the dropwise addition was completed within 1 to 3 hours, and then the temperature was raised to 80° C., and the ethanol was distilled off. 2 parts of acrylic acid, 1 part of dicyclohexylcarbodiimide, 0.05 part of 4-dimethylaminopyridine and 0.01 part of hydroquinone are prepared into a mixed solution, and the mixed solution is quickly added dropwise to the first reaction device within 5 minutes, After continuing the reaction for 2 h, the solvent was distilled off in vacuo to obtain the i...

Embodiment 2

[0031] In parts by weight, 100 parts of 4-hydroxybutyl vinyl ether polyoxyethylene polyoxypropylene ether (wherein p=10, q=2), 0.15 parts of 0.1mol / L chloroplatinic acid ethanol solution were added to the In the first reaction device of the condensation recovery device, nitrogen was filled while stirring for protection, the temperature was raised to 50°C, 0.0006 parts of triphenylphosphine was added, and then 16 parts of hydride-terminated poly(dimethylsiloxane) were added dropwise. ) (where n=6), the dropwise addition was completed within 1 to 3 hours, and then the temperature was raised to 80° C., and the ethanol was distilled off. Prepare a mixed solution with 3 parts of acrylic acid, 2 parts of dicyclohexylcarbodiimide, 1 part of 4-dimethylaminopyridine and 0.08 part of p-benzoquinone, quickly add the mixed solution dropwise to the first reaction device within 5 minutes, continue After reacting for 2 h, the solvent was distilled off in vacuo to obtain the intermediate.

...

Embodiment 3

[0034] In parts by weight, 100 parts of 4-hydroxybutyl vinyl ether polyoxyethylene polyoxypropylene ether (wherein p=8, q=2), 0.2 parts of 0.1mol / L chloroplatinic acid ethanol solution were added to the In the first reaction device of the condensation recovery device, nitrogen was filled while stirring for protection, the temperature was raised to 40°C, 0.0005 parts of triphenylphosphine was added, and then 20 parts of hydride-terminated poly(dimethylsiloxane) was added dropwise. ) (wherein n=6), the dropwise addition was completed within 1 to 3 hours, and then the temperature was raised to 85° C., and the ethanol was distilled off. Mix 6 parts of acrylic acid, 4 parts of dicyclohexylcarbodiimide, 0.15 parts of 4-dimethylaminopyridine and 0.06 parts of phenothiazine to prepare a mixed solution, quickly add the mixed solution dropwise to the first reaction device within 5 minutes, continue After reacting for 1 h, the solvent was distilled off in vacuo to obtain the intermediate...

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Abstract

The invention discloses a preparation method of a polycarboxylic acid water reducing agent with low sensitivity on mud content of concrete. A silane group is introduced into a polycarboxylic acid molecular structure, the silane group and cement granules can form chemical bonding, the molecular size is increased, the polycarboxylic acid is prevented from being adsorbed by the mud with an intercalated structure, the adaptability problem of the polycarboxylic acid and the cement is improved, and the sensitivity on the change of the mud content can be reduced; and a polyether ester structure is introduced in the polycarboxylic acid molecular structure, so that the shape and the branched structure of the long side chain of the polycarboxylic acid in a concrete multi-phase system can be improved, the side chain is extended and relax, the peaceability of the concrete is improved and the sensitivity on the change of the mud content is reduced.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to a preparation method of a low-sensitivity polycarboxylate water reducer to concrete mud content. Background technique [0002] Concrete admixtures, especially water reducers, are widely used in cement-based materials, such as cement paste, mortar and concrete, and are very necessary in the field of engineering construction and building structures. These concrete admixtures can increase the fluidity of cement-based materials and effectively improve the performance of hardened concrete such as strength and durability. [0003] With the development of concrete in the direction of high performance and multifunctionality, concrete is required to have high workability, high strength, high durability, and can meet the application in many special cases. Compared with traditional admixtures such as naphthalene-based water-reducers and aliphatic water-reducers, pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F291/06C08F291/00C08F220/06C08F220/20C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08F283/124
Inventor 方云辉赖广兴温庆如林艳梅蒋卓君柯余良陈小路李格丽林添兴桂苗苗
Owner KZJ NEW MATERIALS GROUP CO LTD
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