Polycarboxylate-type water reducing agent mother liquid, preparation method and application thereof

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 sensitivity, easy bleeding and segregation of concrete, complicated production process, etc., and achieves low dosage and improved slump retention effect. , the effect of simple process

Active Publication Date: 2016-01-13
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

[0008] The purpose of the present invention is to overcome the disadvantages of complex production process, easy bleeding and segregation of concrete, and high sensitivity in the past, to provide a carboxylic acid-based

Method used

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  • Polycarboxylate-type water reducing agent mother liquid, preparation method and application thereof
  • Polycarboxylate-type water reducing agent mother liquid, preparation method and application thereof
  • Polycarboxylate-type water reducing agent mother liquid, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Prepare high water retention and high slump retention type polycarboxylate water reducer according to the following raw material quantity and process, specifically:

[0038] (1) Preparation of high water retention and high slump retention type polycarboxylate superplasticizer mother liquor D-1

[0039] ①Material preparation: add 3.20g of ammonium persulfate to 13g of deionized water, mix well, and use tank A for spare, which is material a; 32.0g of acrylic acid, 1.5g of vinyl acetate, 0.7g of mercaptopropionic acid, add 30g of deionized water, mix Evenly, the B tank is spare, it is the b material;

[0040]②Polymerization: Add 543.5g of deionized water and 355g of prenol polyoxyethylene ether (MW=2400) into a glass reactor equipped with a thermometer and an electric stirrer, stir evenly, raise the temperature to 60±1°C, and add dropwise Material a and material b, material a is added dropwise for 3 hours, material b is added dropwise for 2.5 hours, after the addition of ...

Embodiment 2

[0045] Prepare high water retention and high slump retention type polycarboxylate water reducer according to the following raw material quantity and process, specifically:

[0046] (1) Preparation of high water retention and high slump retention type polycarboxylate superplasticizer mother liquor D-2

[0047] ①Material preparation: Add 3.0g of ammonium persulfate to 13g of deionized water, mix evenly, reserve in tank A, which is material a; add 50.0g of acrylic acid, 0.5g of mercaptopropionic acid, add 30g of deionized water, mix well, reserve in tank B, It is for b material;

[0048] ②Polymerization: Add 543.5g of deionized water and 340g of methallyl alcohol polyoxyethylene ether (MW=2200) into a glass reactor equipped with a thermometer and an electric stirrer, stir evenly, raise the temperature to 60±1°C, and drop Add material a and material b, add material a dropwise for 3 hours, add material b dropwise for 2.5 hours, continue the reaction for 3 hours after adding materi...

Embodiment 3

[0052] Prepare high water retention and high slump retention type polycarboxylate water reducer according to the following raw material quantity and process, specifically:

[0053] (1) Preparation of high water retention and high slump retention type polycarboxylate superplasticizer mother liquor D-3

[0054] ①Material preparation: Add 2.80g of ammonium persulfate to 13g of deionized water, mix evenly, reserve in tank A, which is material a; add 37.0g of acrylic acid, 0.45g of mercaptopropionic acid, add 30g of deionized water, mix well, reserve in tank B, It is for b material;

[0055] ②Polymerization: Add 543.5g of deionized water and 350g of prenol polyoxyethylene ether (MW=2400) into a glass reactor equipped with a thermometer and an electric stirrer, stir evenly, raise the temperature to 60±1°C, and add dropwise Material a and material b, material a is added dropwise for 3 hours, material b is added dropwise for 2.5 hours, after the addition of material a is completed, t...

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Abstract

The invention belongs to the technical field of concrete additives in building materials and provides a polycarboxylate-type water reducing agent mother liquid, a preparation method and an application thereof. The polycarboxylate-type water reducing agent mother liquid is prepared from unsaturated polyoxyethylene ether, a chain transfer agent, unsaturated acid and/or unsaturated acid derivatives, an initiator and water. The polycarboxylate-type water reducing agent mother liquid is prepared through a one-step method. A water reducing agent is compounded from the mother liquid, preferably-selected slump-retaining components, a defoamer and water. The water reducing agent prepared from the mother liquid is low in doping quantity, is high in water reducing efficiency, is good in water retention and slump retaining effects and has good cement adaptability. The production process is simple, is less in investment and device and is low in cost. The polycarboxylate-type water reducing agent has excellent slump degree keeping capability, can significantly improve disintegration and bleeding in concrete, can improve operation performance, mechanical performance and durability of concrete, thereby improving building engineering quality and prolonging service life of buildings.

Description

technical field [0001] The invention relates to the technical field of admixtures for concrete in building materials, in particular to a polycarboxylate water-reducer mother liquor and a preparation method and application thereof. 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] However, at present, the synthesis methods of po...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F283/06C08F220/28C08F218/08C08F220/58C08F220/18C04B103/30
Inventor 荀武举吴长龙辛德胜王跃松王岳华
Owner 大连市建筑科学研究设计院股份有限公司
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