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Slow-release type polycarboxylic water reducing agent, preparation method thereof and application

The technology of polycarboxylic acid series and water reducing agent is applied in the field of admixtures for concrete, which can solve the problems of high cost, complicated production process, long reaction time, etc., and achieves good cement adaptability, low dosage and good plastic preservation effect. Effect

Active Publication Date: 2015-12-23
大连市建筑科学研究设计院股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of the traditional slow release type water reducer, such as complex production process, long reaction time, and high cost, and provide a kind of water reducing agent with simple process, good plastic retention effect, low dosage, good cement adaptability, energy saving and environmental protection. Slow release type polycarboxylate water reducer and preparation method thereof

Method used

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  • Slow-release type polycarboxylic water reducing agent, preparation method thereof and application
  • Slow-release type polycarboxylic water reducing agent, preparation method thereof and application
  • Slow-release type polycarboxylic water reducing agent, preparation method thereof and application

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Prepare slow release type polycarboxylate water reducer X-1 according to the following raw material quantity and process, specifically:

[0027] ①Material preparation: Add 0.09g of L-ascorbic acid into 13g of deionized water, mix evenly, use tank A as spare, it is material a; 20.0g of acrylic acid, 15.0g of hydroxypropyl acrylate, 0.5g of mercaptopropionic acid, add into 26g of deionized water, Mix evenly, reserve the B tank, it is the b material;

[0028] ② Polymerization: Add 224.7 g of deionized water, methallyl alcohol polyoxyethylene ether (M W =2400) 140g, after fully dissolved by stirring, add 30% H 2 o 2 0.50g, stir evenly, keep the temperature at 45°C, and continuously add material a and b dropwise at the same time, add material A dropwise for 2.5 hours, add material B dropwise for 2 hours, react for 2 hours after adding material A dropwise, cool down to below 40°C, Neutralize with 10 g of 40% sodium hydroxide aqueous solution until the pH value reaches 5-7 ...

Embodiment 2

[0031] Prepare slow-release polycarboxylate water reducer X-2 according to the following raw material quantity and process, specifically:

[0032] ①Material preparation: Add 0.16g of L-ascorbic acid into 13g of deionized water, mix evenly, use can A as spare, it is material A; 16.0g of acrylic acid, 14.0g of hydroxypropyl acrylate, 0.5g of mercaptopropionic acid, add into 26g of deionized water, Mix evenly, reserve the B tank, it is the b material;

[0033] ②Polymerization: Add 224.7g of deionized water, isopentenol polyoxyethylene ether (M W =2400) 145g, after fully dissolved by stirring, add 30% H 2 o 2 0.70g, stir evenly, keep the temperature at 45°C, and continuously add material a and b dropwise at the same time, add material A dropwise for 2.5 hours, add material B dropwise for 2 hours, react for 2 hours after adding material A, cool down to below 40°C, Use 10 g of 40% sodium hydroxide aqueous solution to neutralize until the pH value reaches 5-7 to obtain slow-releas...

Embodiment 3

[0035] Prepare slow-release polycarboxylate water reducer X-3 according to the following raw material quantity and process, specifically:

[0036] ①Material preparation: Add 0.35g of L-ascorbic acid into 13g of deionized water, mix evenly, use tank A as spare, it is material a; 15.0g of acrylic acid, 10.0g of hydroxyethyl acrylate, 0.8g of mercaptopropionic acid, add 26g of deionized water, Mix evenly, reserve the B tank, it is the b material;

[0037] ②Polymerization: Add 224.7g of deionized water, isopentenol polyoxyethylene ether (M W =2400) 150g, after fully dissolved by stirring, add 30% H 2 o 2 1.10g, stir evenly, keep the temperature at 50°C, and continuously add material a and b dropwise at the same time, add material A dropwise for 2.5 hours, add material B dropwise for 2 hours, react for 2 hours after adding material A dropwise, cool down to below 40°C, Use 10 g of 40% sodium hydroxide aqueous solution to neutralize until the pH value reaches 5-7 to obtain slow-re...

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Abstract

The invention belongs to the technical field of a concrete admixture in building materials and provides a slow-release type polycarboxylic water reducing agent, a preparation method thereof and application. The slow-release type polycarboxylic water reducing agent is synthesized by adopting a free-radical polymerization method in an aqueous solution. The slow-release type polycarboxylic water reducing agent is prepared by unsaturated polyoxyethylene ether, unsaturated acid or a mixture of unsaturated acid ester and the unsaturated acid, a chain transferring agent, an oxidizing agent, a reducing agent and water. The slow-release type polycarboxylic water reducing agent has the advantages of low doping amount, good plasticity-maintaining effect, good cement adaptability and good energy-saving and environmental-friendly effects and the like; the production process is simple; the equipment investment is less and the cost is low; by the adoption of the water reducing agent, water reducing components can be gradually released, and the content of the effective water reducing components in the concrete is guaranteed, and the plasticity of the concrete is maintained, and the cement hydration can be delayed, further the maintaining capability for the slump and the fluidity is excellent for concrete with large slump and concrete with medium and small slump respectively, and the large-volume concrete cracks generated by over-high hydration temperature can be reduced, and the mixability and the mechanical property of the concrete can be improved.

Description

technical field [0001] The invention relates to the technical field of admixtures for concrete in building materials, in particular to a slow release polycarboxylate water reducer and its preparation method and application. Background technique [0002] Water reducer is an important concrete admixture and an indispensable component of modern concrete. Under the condition that the workability of concrete and the amount of cement remain unchanged, the use of water reducing agent can reduce the amount of mixing water and improve the strength of concrete. Polycarboxylate superplasticizer is the third-generation high-performance superplasticizer developed after the first-generation common superplasticizers such as wood calcium and the second-generation high-efficiency superplasticizers such as naphthalene series. High efficiency, high compressive strength and other advantages, so it has gradually been widely used. [0003] In practical engineering applications, there are still ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C08F283/06C08F220/06C08F220/28C08F220/18C08F220/14C08F218/08C08F2/38
Inventor 吴长龙荀武举
Owner 大连市建筑科学研究设计院股份有限公司
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