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Slump-retaining water-reducing polycarboxylic acid water reducing agent and low-temperature quick preparation method thereof

A technology of polycarboxylic acid and water reducing agent, applied in the field of building materials, can solve problems such as dependence, and achieve the effects of good workability, wide adaptability and high conversion rate

Active Publication Date: 2015-11-11
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the process of social and economic development, cost control is particularly important. Commercial concrete mixing plants have been looking for ways to reduce the cost of single concrete. Recently, the special mix ratio of high-grade and low-gel materials has become popular. This mix ratio can be greatly improved. Save the amount of cement and effectively reduce the production cost, but this kind of mix ratio is more dependent on the admixture, and puts forward higher requirements on the performance of the admixture, and the admixture with high slump retention and high water reducing function can meet its requirements , therefore, it is of great significance to develop a polycarboxylate superplasticizer with slump retention and water reduction

Method used

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  • Slump-retaining water-reducing polycarboxylic acid water reducing agent and low-temperature quick preparation method thereof
  • Slump-retaining water-reducing polycarboxylic acid water reducing agent and low-temperature quick preparation method thereof
  • Slump-retaining water-reducing polycarboxylic acid water reducing agent and low-temperature quick preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Prepare solution A with 15 parts of acrylic acid and 30 parts of water; 0.4 parts of sodium formaldehyde sulfoxylate, 0.1 part of sodium sulfite, 0.1 part of 2-carboxy-2-sulfinic acid disodium salt and 30 parts of water Prepare solution B with a pH value of 7-9; prepare solution C with 1 part of chain transfer agent thioglycolic acid and 30 parts of water;

[0030] 2) Add 100 parts of isopentenyl polyoxyethylene ether (TPEG) (molecular weight 1200-4800), 2 parts of acrylic acid, 2 parts of oxidant hydrogen peroxide and 40 parts of water into the reaction kettle, mix to obtain a pH value of 3 ~6 mixed solution, adjust the reaction temperature to 60°C, stir and dissolve; first add solution B and solution C dropwise to the mixed solution at the same time, after 10 minutes, continue to add solution B and solution C Add solution A dropwise, wherein the dropping rate of the first 2 / 3 of solution A is 0.1g / s~0.2g / s, and the dropping rate of the last 1 / 3 of solution A is 0.0...

Embodiment 2

[0033] 1) Prepare solution A with 7 parts of acrylic acid, 3 parts of hydroxypropyl acrylate and 20 parts of water; prepare 0.2 parts of sodium formaldehyde sulfoxylate as a reducing agent, 0.1 part of succulent and 20 parts of water to make the pH value 7-9 Solution B; 0.2 parts of chain transfer agent mercaptoacetic acid, 0.1 part of sodium methyl propyl sulfonate and 20 parts of water are prepared into solution C;

[0034] 2) Mix 20 parts of hydroxybutyl vinyl ether polyoxyethylene ether (VPEG), 80 parts of isopentenyl polyoxyethylene ether (molecular weight is 1200-4800), 2 parts of acrylic acid, 1 part of methacrylic acid, 1 Add one part of oxidant hydrogen peroxide and 70 parts of water into the reaction kettle, mix to obtain a mixed solution with a pH value of 3 to 6, adjust the reaction temperature to 30°C, and stir to dissolve; first drop solution B and solution C into the mixed solution at the same time , after 20 minutes of dropping, start to drop solution A while c...

Embodiment 3

[0037] 1) Prepare solution A with 6 parts of acrylic acid, 3 parts of methacrylic acid, 2 parts of hydroxyethyl acrylate and 20 parts of water; the reducing agent is 0.05 parts of sodium formaldehyde sulfoxylate, 0.15 parts of sodium sulfite, 0.05 parts of 2-carboxy-2 - Disodium sulfinic acid glycolate and 20 parts of water are prepared into a solution B with a pH value of 7 to 9; 0.2 parts of mercaptoacetic acid, 0.3 parts of mercaptopropionic acid and 20 parts of water are prepared into solution C as a chain transfer agent;

[0038]2) Mix 30 parts of hydroxybutyl vinyl ether polyoxyethylene ether, 70 parts of isopentenyl polyoxyethylene ether (all molecular weights are 1200 to 4800), 1 part of acrylic acid, 1 part of hydroxyethyl acrylate, and 0.5 parts of oxidizing agent Add sodium persulfate and 70 parts of water into the reaction kettle, mix to obtain a mixed solution with a pH value of 3-6, adjust the reaction temperature to 40°C, stir and dissolve; first add solution B a...

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Abstract

The invention discloses a slump-retaining water-reducing polycarboxylic acid water reducing agent and a low-temperature quick preparation method thereof. The preparation method comprises the following steps: mixing 100 parts of unsaturated polyethenoxy ether, 1-10 parts of unsaturated carboxylic acid, 0.05-2 parts of oxidizer and 40-90 parts of water, regulating the reaction temperature to 15-60 DEG C, and dissolving by stirring; simultaneously dropwisely adding a solution B containing a reducer sodium formaldehyde sulfoxylate and a solution C containing a chain-transfer agent, and after 5-30 minutes, starting dropwisely adding a solution A containing unsaturated carboxylic acid, wherein the dropwise addition of the three solutions is finished within 1-3 hours, and the finishing time of the solution B and solution C is 10-30 minutes later than that of the solution A; and keeping the temperature to react for 30-60 minutes, adding 1-10 parts of sodium hydroxide into the reaction solution to obtain the slump-retaining water-reducing polycarboxylic acid water reducing agent. By controlling the dropwise addition time and sequence of the materials and carrying out high-efficiency polymerization reaction by using the novel mixed reducer, the reactant conversion rate is higher. Compared with the existing water reducing agent, the water reducing agent disclosed by the invention has the advantages of higher slump retaining property, higher water reducing rate, higher workability and wider adaptability.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a slump-retaining water-reducing polycarboxylate water-reducer and a low-temperature rapid preparation method thereof. Background technique [0002] With the development of concrete in the direction of high performance and multifunctionality, higher requirements are put forward for admixtures. In order to meet the pumpability and strength requirements of concrete, it is necessary to develop a variety of polycarboxylate superplasticizers with different functions. meet social needs. [0003] The preparation process of polycarboxylate superplasticizer can be based on the design principle of molecular structure, and some functional groups such as water reducing and slump retention can be grafted on the macromolecular chain by free radical polymerization to obtain a comb-shaped structure, Macromolecules with star structure or cross-linked structure, these diffe...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/28C08F228/02C08F4/40C04B24/16C04B24/26C04B103/30
Inventor 吴银财方云辉柯余良曾贤华张小芳郑荣平李格丽林倩
Owner KZJ NEW MATERIALS GROUP CO LTD
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