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Preparation method of anti-mud polycarboxylic water reducer

A polycarboxylate-based, mud-resistant technology, which is applied in the field of mud-resistant polycarboxylate-based water reducers and the preparation of polycarboxylate-based water-reducers, can solve the problems of insufficient concrete water reduction, large slump loss, Without increasing the dosage and other problems, it can achieve the effect of enhancing steric hindrance, low equipment requirements, and increasing water reducing rate

Active Publication Date: 2015-07-08
NANJING RUIDI HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of this polycarboxylate water reducer when the aggregate mud content is high can avoid the adverse effect of the aggregate mud content on the polycarboxylate water reducer in ready-mixed concrete, without increasing the polycarboxylate water reducer. Solve the problems of insufficient water reduction, large slump loss, and low strength of concrete under the premise of the amount of water reducing agent

Method used

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  • Preparation method of anti-mud polycarboxylic water reducer
  • Preparation method of anti-mud polycarboxylic water reducer
  • Preparation method of anti-mud polycarboxylic water reducer

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Preparation of quaternary ammonium salt oligomers: add 137 parts by weight of epibromohydrin, 400 parts by weight of The water of ethanol and 98.2 parts by weight; Nitrogen replacement is carried out to reaction vessel under stirring condition and be heated to 30~35 ℃ under nitrogen atmosphere, then slowly add the trimethylamine solution (30%) of 236 parts by weight dropwise in 1 hour, and stir at low speed; add 23 parts by weight of phosphoric acid to adjust the pH value of the system to 1 to 2, add 0.8 parts by weight of ammonium persulfate, 5 parts by weight of sodium hypophosphite and a composite initiator solution composed of 100 parts by weight of water, and then heat up to 65 ~70°C reaction stopped after 5.5 hours. The reaction solution was distilled under reduced pressure at 70kPa vacuum degree and 90°C to obtain light yellow viscous quaternary ammonium salt oligomer PQA-1.

[0024] (2) Preparation of mud-resistant polycarboxylate water reducer: add 19.2 pa...

Embodiment 2

[0026] (1) Preparation of quaternary ammonium salt oligomers: add 137 parts by weight of epibromohydrin, 200 parts by weight of The water of Virahol and 165.2 parts by weight; Nitrogen replacement is carried out to reaction vessel under stirring condition and be heated to 30~35 ℃ under nitrogen atmosphere, then the triethylamine solution (30 parts by weight) of 370 parts by weight is slowly added dropwise in 1.5 hours %), and low-speed stirring; Add the phosphoric acid adjustment system pH value 1~2 of 21 weight parts, add the composite initiator solution that the potassium persulfate of 0.8 weight part, the sodium bisulfite of 6 weight parts and 100 weight parts water form, Then the temperature was raised to 65-70° C. and the reaction was stopped for 7 hours. The reaction solution was distilled under reduced pressure at 70kPa vacuum degree and 90°C to obtain light yellow viscous quaternary ammonium salt oligomer PQA-2.

[0027](2) Preparation of mud-resistant polycarboxylate...

Embodiment 3

[0029] (1) Preparation of quaternary ammonium salt oligomers: add 137 parts by weight of epibromohydrin, 340 parts by weight of Methanol and 112 parts by weight of water; the reaction vessel is replaced with nitrogen under agitation and heated to 30-35°C under a nitrogen atmosphere, and then 292 parts by weight of diethylamine solution (30%) is slowly added dropwise within 1.5 hours , and stir at a low speed; add 11 parts by weight of concentrated sulfuric acid to adjust the pH value of the system to 1 to 2, add 1 part by weight of sodium persulfate, 7 parts by weight of sodium sulfite and a composite initiator solution composed of 100 parts by weight of water, then heat up to 65 The reaction stopped at ~70°C for 6 hours. The reaction solution was distilled under reduced pressure at 70kPa vacuum degree and 90°C to obtain light yellow viscous quaternary ammonium salt oligomer PQA-3.

[0030] (2) Preparation of mud-resistant polycarboxylate-based water reducer: add 22.5 parts b...

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Abstract

The invention relates to an anti-mud polycarboxylic water reducer and a preparation method thereof and belongs to the field of water reducers. The preparation method of the water reducer comprises the steps of (1) preparing quaternary ammonium salt oligomer: allowing epibromohydrin and tertiary amine compound aqueous solutions to react by the action of a composite initiator in a mixed solvent of low alcohol and water when a system pH (potential of hydrogen) value is 1-2, then performing reduced pressure distillation, and obtaining light yellow viscous quaternary ammonium salt oligomer, and (2) preparing the anti-mud polycarboxylic water reducer, performing radical copolymerization on quaternary ammonium salt oligomer, isopentene alcohol ethoxylate, amino trimethylene phosphonic acid, unsaturated monocarboxylic acid and a derivative of unsaturated monocarboxylic acid by the action of an initiator and a chain transfer agent to form the colorless to light yellow transparent polycarboxylic water reducer. An adverse effect of a mud content of aggregate in concrete on the polycarboxylic water reducer can be avoided, and the problems of insufficient water reduction, great slump loss and lower strength of the concrete are solved on the premise that the mixing amount of the polycarboxylic water reducer is not increased.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures in building materials, in particular to a mud-resistant polycarboxylate water reducer, and in particular to a preparation method of the polycarboxylate water reducer. Background technique [0002] Polycarboxylate water reducer is more and more widely used in concrete engineering because of its excellent properties such as high water reducing rate, high slump retention, high reinforcement and high durability. However, a large number of engineering examples and studies have shown that compared with naphthalene-based, melamine-based and sulfamic acid-based water-reducers, polycarboxylate-based water-reducers are more sensitive to the clay content of aggregates, mainly manifested as polycarbonate-based water-reducers. The water-reducing and dispersing ability of the carboxylic acid-based water-reducing agent is severely reduced, and the slump-preserving effect is poor, resulting in a decre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F283/10C08F220/06C08F220/56C08F220/28C08F220/14C08F2/38C08G59/10C04B24/26C04B103/30
Inventor 陈国新祝烨然王冬刘兴荣杜志芹蔡明付丹华黄国泓方绪顺
Owner NANJING RUIDI HIGH TECH
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