Preparation method of polycarboxylic acid with low sensitivity to silt content for 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: 2018-05-15
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 ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In parts by weight, 100 parts of allyl polyoxyethylene polyoxypropylene ether (wherein p=10, q=2), 0.2 parts of 0.1mol / L chloroplatinic acid tetrahydrofuran solution are added to the condensing recovery device In the first reaction device; start the stirring device, fill with nitrogen protection, heat up to 45 ° C, add 0.001 parts of triphenylphosphine, and then start to drop 14 parts of hydride-terminated poly(dimethylsiloxane) (where n =4), the dropwise addition was completed within 2 hours, and then the temperature was raised to 70° C., and tetrahydrofuran was distilled off. Prepare 6 parts of maleic anhydride, 4 parts of dicyclohexylcarbodiimide, 0.05 part of 4-dimethylaminopyridine and 0.05 part of 2-sec-butyl-4.6-dinitrophenol into a mixed solution, and quickly mix the solution within 5 minutes The solution was added dropwise into the first reaction device, and after continuing to react for 3 hours, the solvent was distilled off in vacuo to obtain the intermediate...

Embodiment 2

[0032] In parts by weight, 100 parts of allyl polyoxyethylene polyoxypropylene ether (wherein p=8, q=2), 0.15 parts of 0.1mol / L chloroplatinic acid tetrahydrofuran solution are added to the condensing recovery device In the first reaction device; turn on the stirring device, fill with nitrogen protection, heat up to 40 ° C, add 0.0009 parts of triphenylphosphine, and then start to drop 20 parts of hydride-terminated poly(dimethylsiloxane) (where n =6), 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 4 parts of maleic anhydride, 5 parts of dicyclohexylcarbodiimide, 0.15 parts of 4-dimethylaminopyridine and 0.1 part of β-phenylnaphthylamine, and quickly add the mixed solution dropwise to the first In the reaction device, after continuing to react for 2 h, the solvent was distilled off in vacuo to obtain the intermediate.

[0033] In parts by weight, the second...

Embodiment 3

[0035] In parts by weight, 100 parts of allyl polyoxyethylene polyoxypropylene ether (wherein p=6, q=2), 0.1 part of 0.1mol / L tetrahydrofuran solution of chloroplatinic acid, join the condensation recovery device In the first reaction device; turn on the stirring device, fill with nitrogen protection, heat up to 40 ° C, add 0.0008 parts of triphenylphosphine, and then start to drop 10 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. 3 parts of maleic anhydride, 6 parts of dicyclohexylcarbodiimide, 0.1 part of 4-dimethylaminopyridine and 0.01 part of 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxygen free The mixed solution was formulated into a mixed solution, and the mixed solution was quickly added dropwise to the first reaction device within 5 minutes, and after the reaction was continued for 3 hours, the solvent was distilled o...

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Abstract

The invention discloses a preparation method of polycarboxylic acid with low sensitivity to silt content for concrete. According to the preparation method disclosed by the invention, trimethylsilyl groups are introduced into polycarboxylic acid molecule structures, so that chemical bonding with cement particles can be formed, increase of the molecular dimension is facilitated, the polycarboxylic acid is prevented from being adsorbed by silt with an intercalated structure, the adaptability problem to the cement is improved, and the sensitivity to the silt content change can be reduced; and moreover, by introducing a polyether-ester structure into the polycarboxylic acid molecule structure, the shape and branched structure of long side chains of the polycarboxylic acid in a concrete heterogeneous system can be improved, so that the side chains are expanded and slacked, the peaceability of the concrete is improved, and the sensitivity on the silt content change is reduced.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to a method for preparing concrete with low sensitivity to mud content polycarboxylic acid. 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, polycarboxy...

Claims

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Application Information

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IPC IPC(8): C08F291/06C08F222/06C08F228/02C08F220/56C08F2/48C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F2/48C08F283/065C08F283/12C08F222/06C08F228/02C08F220/56
Inventor 方云辉温庆如赖华珍赖广兴林添兴桂苗苗林艳梅钟丽娜张小芳陈小路
Owner KZJ NEW MATERIALS GROUP CO LTD
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