Polycarboxylate superplasticizer and preparation method thereof

A technology of water reducing agent and polycarboxylic acid, which is applied in the field of chemical building materials, can solve the problems of chain transfer agent not being environmentally friendly, poor production environment, and hidden safety hazards, and achieve the elimination of pollution and safety hazards, and the adaptability of high-slump cement , the effect of reducing production costs

Active Publication Date: 2015-04-08
KZJ NEW MATERIALS GROUP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At this stage, some progress has been made in the preparation of polycarboxylate superplasticizers under low temperature (normal temperature), but in most normal temperature and heating processes, the chain transfer agents used are toxic thioglycolic acid and mercaptopropylene. These toxic chain transfer agents have a strong pungent odor, which may cause allergies and poisoning if inhaled, ingested, or absorbed through the skin, which not only makes the production environment worse, but also brings great safety hazards
CN102504124A uses modified polyether and acryli

Method used

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  • Polycarboxylate superplasticizer and preparation method thereof
  • Polycarboxylate superplasticizer and preparation method thereof
  • Polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0028]

[0029]

[0030] (2) dissolving acrylic acid and hydroxyethyl acrylate in 30 parts by weight of water to obtain the first solution, dissolving the sodium hypophosphite in 30 parts by weight of water to obtain the second solution, dissolving the tartaric acid in 30 parts by weight of water to obtain the second solution Three solutions, isopentenol polyoxyethylene ether is dissolved in 135 parts by weight of water to obtain the fourth solution;

[0031] (3) Add sodium persulfate and 100 parts by weight of water into the reaction kettle, stir and dissolve at 5-40°C, add the first solution, the second solution, the third solution and the fourth solution dropwise, and add dropwise The time is 1.5 to 3 hours, and the temperature is kept for 1 to 2 hours after the dropwise addition, and the copolymerization reaction is carried out;

[0032] (4) After the end of the copolymerization reaction, adjust the...

Embodiment 2

[0034] (1) Take each raw material component by weight as follows:

[0035]

[0036] (2) Acrylic acid and hydroxyethyl methacrylate are dissolved in 30 parts by weight of water to obtain the first solution, the sodium hypophosphite is dissolved in 30 parts by weight of water to obtain the second solution, and the tartaric acid is dissolved in 30 parts by weight of water To obtain the third solution, prenol polyoxyethylene ether was dissolved in 135 parts by weight of water to obtain the fourth solution;

[0037] (3) Add ammonium persulfate and hydrogen peroxide into the reaction kettle together with 100 parts by weight of water, stir and dissolve at 5-40°C, then add dropwise the first solution, the second solution, the third solution and the fourth solution respectively. solution, the dropping time is 1.5 to 3 hours, and the temperature is kept constant for 1 to 2 hours after the dropping, and the copolymerization reaction is carried out;

[0038] (4) After the end of the c...

Embodiment 3

[0040] (1) Take each raw material component by weight as follows:

[0041]

[0042] The block number range of EO and PO in the above-mentioned methallyl polyoxyethylene polyoxypropylene ether is EO:PO=100:0.5~2;

[0043] (2) dissolving acrylic acid and hydroxyethyl acrylate in 30 parts by weight of water to obtain the first solution, dissolving the sodium hypophosphite in 30 parts by weight of water to obtain the second solution, dissolving the tartaric acid in 30 parts by weight of water to obtain the second solution Three solutions, methallyl polyoxyethylene polyoxypropylene ether is dissolved in 135 parts by weight of water to obtain the fourth solution;

[0044] (3) Add sodium persulfate and 100 parts by weight of water into the reaction kettle, stir and dissolve at 5-40°C, add the first solution, the second solution, the third solution and the fourth solution dropwise, and add dropwise The time is 1.5 to 3 hours, and the temperature is kept for 1 to 2 hours after the ...

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Abstract

The invention discloses a polycarboxylate superplasticizer and a preparation method thereof. The raw materials of the polycarboxylate superplasticizer comprise the following components in parts by weight: 190-200 parts of a polyether monomer, 15-25 parts of unsaturated acid, 1-5 parts of hydroxyl alkyl acrylate, 1.5-3.5 parts of an oxidizing agent, 1-3 parts of sodium hypophosphite, 0.5-2.5 parts of tartaric acid, 325 parts of water and 11-21 parts of 30-32% sodium hydroxide by mass concentration, wherein the polyether monomer is 600-3000 methylallyl polyoxyethylene-polyoxypropylene or isopentenol polyoxyethylene ether. The preparation method of the polycarboxylate superplasticizer, disclosed by the invention, is carried out in a temperature range of 5-40 DEG C and can be used for solving the problem that the initiating efficiency is relatively low at a relatively low temperature when a single reducing agent is used, meanwhile, the dropwise adding time can be shortened, the production cycle is shorter, the energy consumption is relatively low and the production cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of chemical building materials, and in particular relates to a polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Concrete water reducer is the most widely used concrete admixture, which can significantly improve the performance of concrete and is regarded as the fifth component of concrete. It has gone through three generations so far. The first generation is lignosulfonate ordinary water reducing agent, mainly using papermaking waste liquid cellulose as raw material, and the water reducing rate is lower, less than 10%; the second generation is mainly composed of β-naphthalenesulfonic acid formaldehyde condensate Naphthalene-based high-efficiency water-reducers are representative, and also include melamine-based water-reducers, sulfamic acid-based water-reducers and aliphatic high-efficiency water-reducers. The water-reducing rate can reach more than 20%. Cement ...

Claims

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Application Information

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IPC IPC(8): C04B24/32C08F283/06C08F220/06C08F220/28C08F4/40C08F2/38C04B103/30
Inventor 钟丽娜方云辉蒋卓君林艳梅
Owner KZJ NEW MATERIALS GROUP CO LTD
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