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Polycarboxylic acid water reducer and preparation method thereof

A technology of water reducer and polycarboxylate, applied in the field of polycarboxylate water reducer and its preparation, can solve the problems of unfavorable operation for workers, heavy taste, etc., achieve good slump retention, high water reducing rate, and improve the production workshop environmental effects

Active Publication Date: 2015-01-28
KZJ NEW MATERIALS GROUP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the chain transfer agents used in most processes are mercapto-based raw materials such as mercaptoacetic acid and mercaptopropionic acid. These raw materials have a strong taste and are unfavorable to the environment and the operation of industrial workers.

Method used

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  • Polycarboxylic acid water reducer and preparation method thereof
  • Polycarboxylic acid water reducer and preparation method thereof
  • Polycarboxylic acid water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Take each raw material component by weighing as follows:

[0028]

[0029]

[0030] (2) Copolymerization reaction: Add TPEG, isopropenylphosphonic acid, vinyltrimethoxysilane and 190 parts by weight of water into the reactor, stir and dissolve at 5-35°C, then add aqueous sodium persulfate ( Sodium persulfate and 30 parts by weight of water) and the mixed aqueous solution (acrylic acid, ferrous chloride, sodium hypophosphite and 30 parts by weight of water) of acrylic acid, sodium hypophosphite and ferrous chloride, the time of dropping is 2.5 hours, dropwise After the end, the temperature was kept constant for 1.5 hours, and the concentration of the product obtained from the reaction was about 40%;

[0031] (3) After the copolymerization reaction, adjust the pH value in the range of 6.0 to 7.0 with sodium hydroxide to obtain a clear solution which is the polycarboxylate water reducer.

Embodiment 2

[0033] (1) Take each raw material component by weighing as follows:

[0034]

[0035] (2) Copolymerization reaction: Add TPEG, 2-acrylamide-2-methylpropylphosphonic acid, vinyltriethoxysilane and 190 parts by weight of water into the reactor, stir and dissolve at 5-35°C Afterwards, dropwise the mixed aqueous solution (acrylic acid, ferrous sulfate, sodium hypophosphite and 30 parts by weight of water) of ammonium persulfate aqueous solution (ammonium persulfate and 30 parts by weight of water) and acrylic acid, sodium hypophosphite and ferrous chloride respectively, The dropping time is 3 hours, and the temperature is kept constant for 1 hour after the dropping, and the concentration of the product obtained from the reaction is about 40%;

[0036] (3) After the copolymerization reaction, adjust the pH value in the range of 6.0 to 7.0 with potassium hydroxide to obtain a clear solution which is the polycarboxylate water reducer.

Embodiment 3

[0038] (1) Take each raw material component by weighing as follows:

[0039]

[0040] (2) Copolymerization reaction: Add HPEG, ethylenediamine-dimethylphosphonic acid, vinyltriisopropoxysilane and 190 parts by weight of water into the reaction kettle together, stir and dissolve at 5-35°C, respectively Add dropwise the mixed aqueous solution of aqueous hydrogen peroxide (hydrogen peroxide and 30 parts by weight of water) and acrylic acid, sodium hypophosphite, ferrous chloride and ferrous sulfate (acrylic acid, ferrous chloride, ferrous sulfate, sodium hypophosphite and 30 parts by weight water), the dropping time was 4 hours, and the constant temperature was 1 hour after the dropping, and the concentration of the product obtained from the reaction was about 40%;

[0041] (3) After the copolymerization reaction, adjust the pH value in the range of 6.0 to 7.0 with triethanolamine to obtain a clear solution which is the polycarboxylate water reducer.

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Abstract

The invention discloses a polycarboxylic acid water reducer and a preparation method thereof. Raw materials of the polycarboxylic acid water reducer comprise the following components in parts by weight: 160-170 parts of an ether-based monomer having a molecular weight of 600-3000, 1-4 parts of an unsaturated phosphorous-containing monomer, 1-3 parts of an unsaturated silicon-containing monomer, 15-25 parts of acrylic acid, 1-2 parts of an oxidant, 2-2.5 parts of sodium hypophosphite, 0.3-1.0 part of promoter and 250 parts of water. Since unsaturated phosphorous-containing and silicon-containing monomers are added into the raw materials of the polycarboxylic acid water reducer, a plurality of phosphorous-containing and silicon-containing groups are introduced into molecular chains of the water reducer, so that the polycarboxylic acid water reducer having the advantages of high water-reducing rate, good slump-retaining property and facilitation in development of early strength of concrete is prepared and the common problems of low water-reducing rate and poor slump-retaining property when the polycarboxylic acid water reducer is applied in machine-made sand are overcome.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a polycarboxylate water reducer and a preparation method thereof. Background technique [0002] As a new type of water reducer, polycarboxylate water reducer has the advantages of low dosage, high water reducing rate, good slump retention, small shrinkage, relatively good adaptability to cement and admixtures, and obvious reinforcement effect. The outstanding performance of the series has been widely used in various engineering fields. [0003] Sand is an important component of concrete. Although national standards and industry standards have strict restrictions on its mud content and mud content, due to the different regional distribution of natural resources, there are great differences in the sand used for concrete in various places, including: river sand , machine-made sand and mixed sand composed of river sand and machine-made sand, among which the mu...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F230/02C08F230/08C08F220/06C08F4/40C08F2/38C04B24/40C04B103/30
Inventor 林艳梅方云辉蒋卓君钟丽娜柯余良李格丽林倩郑荣平冉鹏徐仁崇
Owner KZJ NEW MATERIALS GROUP CO LTD
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