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Room temperature synthesis method for polycarboxylic acid high slump retaining water reducer

A synthesis method and a technology for synthesis at room temperature, which are applied in the field of polycarboxylate water reducing agents, can solve the problems of fast slump loss, fast concrete slump loss, and can not be well solved, and achieve short reaction period, High production efficiency and the effect of changing the electrification

Inactive Publication Date: 2014-07-02
山东卓星化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional polycarboxylate superplasticizer is mainly a comb-type copolymer with a main chain composed of polyacrylic acid copolymer and polyoxyethylene as a side chain. The steric hindrance effect of long side chains is used to control the agglomeration of cement particles. It plays a role of dispersion and improves the fluidity, but as the hydration proceeds, the molecules of the water reducer will be covered by the hydrolyzate, and the slump will lose quickly
[0004] Aiming at the problem of rapid concrete slump loss, various patents disclose some improvement methods: such as changing the length and density of the hydrophilic side chain in the water reducing agent molecule, using esterification products as macromonomers for synthesis, or even through Compounding retarder and water retaining agent, etc., but in the current situation of diversification of cement and poor sand and gravel materials, the problem is still not well resolved

Method used

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  • Room temperature synthesis method for polycarboxylic acid high slump retaining water reducer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 205g of water, 205g of methacryl alcohol polyoxyethylene ether (HPEG2400), 8.2g of butyl acrylate and 8.2g of acrylamide into a 1000ml round bottom three-necked flask as the reaction bottom solution.

[0027] Prepare dropping solution A: Mix 20.5g of acrylic acid, 0.82g of mercaptopropionic acid and 40g of water and put them in the dropping bottle.

[0028] Adding solution B: Mix 0.11g of Diaobai, 0.11g of vitamin C and 60g of water and put them in the dropping bottle.

[0029] Stir until the monomers in the flask are dissolved, add 2.05 grams of ammonium persulfate to the bottom liquid, immediately start to drop liquids A and B at the same time, drop them at the same time in 1 hour, continue the heat preservation reaction for 1 hour, add 10.6 grams of 33wt.% Sodium hydroxide solution, adjust the pH value of the solution to 6-7, and replenish water to obtain 40% slump-retaining agent mother liquor.

Embodiment 2

[0031] Add 205g of water, 205g of methacryl alcohol polyoxyethylene ether (HPEG2400), 12g of butyl acrylate and 12g of acrylamide into a 1000ml round-bottomed three-necked flask as the reaction bottom liquid.

[0032] Prepare dropping solution A: Mix 30g of acrylic acid, 1.64g of mercaptopropionic acid and 30g of water and put them in the dropping bottle.

[0033] Adding solution B: mix 0.2 g of diacid cubes, 0.4 g of vitamin C and 60 g of water and put them in the dropping bottle.

[0034] Stir until the monomers in the flask are dissolved, add 1 gram of hydrogen peroxide (concentration: 27.5%), and 2.28 grams of ammonium persulfate into the bottom liquid, immediately start to drop A and B liquids at the same time, drop them at the same time in 1 hour, and continue to keep warm for 1 hour After one hour, add 10.6 grams of 33wt.% sodium hydroxide solution to adjust the pH value of the solution to 6-7, and replenish water to obtain a 40% slump-preserving agent mother solution. ...

Embodiment 3

[0036] Add 205g of water, 205g of methacryl alcohol polyoxyethylene ether (HPEG2400), 10g of butyl acrylate and 10g of acrylamide into a 1000ml round-bottomed three-neck flask as the reaction bottom solution.

[0037] Prepare dropping solution A: Mix 28g of acrylic acid, 1.5g of mercaptopropionic acid and 30g of water and put them in the dropping bottle.

[0038] Preparation of drop solution B: Mix 0.15 g of Diaobai, 0.35 g of vitamin C and 60 g of water and put them in the drop bottle.

[0039] Stir until the monomers in the flask are dissolved, add 1 gram of hydrogen peroxide (concentration: 27.5%) and 2 grams of ammonium persulfate to the bottom liquid, immediately start to add liquid A and liquid B dropwise at the same time, drop them at the same time in 1 hour, and continue the heat preservation reaction for 1 After one hour, add 10.6 grams of 33wt.% sodium hydroxide solution to adjust the pH value of the solution to 6-7, and replenish water to obtain a 40% slump-preservi...

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Abstract

The invention relates to a polycarboxylic acid water reducer, and particularly relates to a room temperature synthesis method for a polycarboxylic acid high slump retaining water reducer. The method comprises steps of putting water, unsaturated polyoxyethylene ether, acrylic acid alkyl ester and amides monomer into a reaction kettle without heating, stirring to be dissolved, putting an oxidant solution into the reaction kettle, then simultaneously dripping a liquid A and a liquid B which are prepared in advance into the reaction kettle and finishing dripping the liquid A and the liquid B simultaneously in one hour, preserving heat for one hour, then adding alkali liquor to be neutralized till the pH is 6-7, supplementing water so as to obtain 40% polycarboxylic acid high slump retaining water reducer, wherein the liquid A is acrylic acid, a chain transfer agent and water, and the liquid B is a reducible catalyst. The method introduces a hydrophobic side chain into the water reducer and changes the electrical nature of the water reducer molecule, has a short reaction cycle for the room temperature reaction spends only 2 hours, and has high production efficiency.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer, in particular to a method for synthesizing a polycarboxylate high slump water reducer at room temperature. Background technique [0002] In recent years, the market demand for polycarboxylate superplasticizers has been increasing, and its research and application have greatly promoted the development of concrete technology and the modernization of building construction technology. The development in the direction of complication, complexity and functionality has put forward higher and higher requirements on the performance of concrete, and new water reducers with better performance need to be developed urgently. [0003] The traditional polycarboxylate superplasticizer is mainly a comb-type copolymer with a main chain composed of polyacrylic acid copolymer and polyoxyethylene as a side chain. The steric hindrance effect of long side chains is used to control the agglomeration of cement particles...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F220/16C08F220/56C04B24/26C04B103/30
Inventor 王建军王双平
Owner 山东卓星化工有限公司
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