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Preparation method of mud content low-sensitive type polycarboxylic acid superplasticizer

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

Inactive Publication Date: 2018-06-01
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

[0029]In parts by weight, 100 parts of methallyl polyoxyethylene polyoxypropylene ether (wherein p=6, q=2), 0.05 parts of 0.1mol / L tetrahydrofuran solution of chloroplatinic acid are added to the equipment equipped with condensation recovery In the first reaction device of the device, nitrogen was filled while stirring for protection, the temperature was raised to 45° C., 0.0008 parts of triphenylphosphine was added, and then 10 parts of hydride-terminated poly(dimethylsiloxane) ( where n=6), the dropwise addition was completed within 3 hours, and then the temperature was raised to 70° C., and tetrahydrofuran was distilled off. Prepare a mixed solution of 2 parts of methyl acrylate, 1 part of dicyclohexylcarbodiimide, 0.2 part of 4-dimethylaminopyridine and 0.05 part of p-hydroxyanisole, and quickly add the mixed solution to reactor A dropwise within 5 minutes After continuing the reaction for 1 h, the solvent was distilled off in vacuo to obtain the intermediate.

[0030] In...

Embodiment 2

[0032] In parts by weight, 100 parts of methallyl polyoxyethylene polyoxypropylene ether (wherein p=6, q=1), 0.15 parts of 0.1mol / L chloroplatinic acid tetrahydrofuran solution are added to the equipment equipped with condensation recovery In the first reaction device of the device, nitrogen was filled while stirring for protection, the temperature was raised to 40° C., 0.001 part of triphenylphosphine was added, and then 18 parts of hydride-terminated poly(dimethylsiloxane) ( where n=6), the dropwise addition was completed within 1 h, and then the temperature was raised to 75° C., and tetrahydrofuran was distilled off. Prepare a mixed solution with 6 parts of methyl acrylate, 3 parts of dicyclohexylcarbodiimide, 0.15 part of 4-dimethylaminopyridine and 0.06 part of 2-tert-butylhydroquinone, and quickly drop the mixed solution within 5 minutes Add it to reactor A, continue to react for 3 hours, and then remove the solvent by vacuum distillation to obtain the intermediate.

[...

Embodiment 3

[0035] In parts by weight, 100 parts of methallyl polyoxyethylene polyoxypropylene ether (wherein p=10, q=1), 0.1 part of 0.1mol / L tetrahydrofuran solution of chloroplatinic acid are added to the equipment equipped with condensation recovery In the first reaction device of the device, nitrogen was filled while stirring for protection, the temperature was raised to 40° C., 0.0005 parts of triphenylphosphine was added, and then 15 parts of hydride-terminated poly(dimethylsiloxane) ( where n=4), the dropwise addition was completed within 3 hours, and then the temperature was raised to 80° C., and tetrahydrofuran was distilled off. Prepare a mixed solution with 5 parts of methyl acrylate, 2 parts of dicyclohexylcarbodiimide, 0.1 part of 4-dimethylaminopyridine and 0.01 part of 2,5-di-tert-butylhydroquinone, and quickly mix the solution within 5 minutes The solution was added dropwise into reactor A, and after continuing to react for 2 hours, the solvent was distilled off in vacuo ...

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Abstract

The invention discloses a preparation method of a mud content low-sensitive type polycarboxylic acid superplasticizer. According to the preparation method disclosed by the invention, a silane group isintroduced into a polycarboxylic acid molecular structure and can be chemically bonded with cement grains; meanwhile, the molecule size is easy to increase, a condition that polycarboxylic acid is adsorbed by mud with an intercalated structure is avoided and the adaptability problem between the polycarboxylic acid and cement is improved; the sensitivity on mud content changes can be reduced; a polybasic ether ester structure is introduced into the polycarboxylic acid molecular structure so that a shape and a branched structure of a polycarboxylic acid long side chain in a concrete multi-phasesystem can be improved, and the side chain is stretched and loosened better; the workability of concrete is improved and the sensitivity on the mud content changes 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 superplasticizer to 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, polycarbo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F283/12C08F220/06C08F228/02C08G77/46C04B24/16C04B24/42C04B103/32
CPCC04B24/165C04B24/42C04B2103/32C08F283/065C08F283/12C08G77/46C08F220/06
Inventor 方云辉温庆如赖华珍赖广兴桂苗苗林添兴张小芳陈小路林艳梅钟丽娜
Owner KZJ NEW MATERIALS GROUP CO LTD
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