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Highly adaptable multi-branched amidoimide type polycarboxylate water reducer and preparation method thereof

A branched amidoimide type polycarboxylic acid and amidoimide type technology, which is applied in the field of concrete admixtures, can solve the problems of few research reports and time-consuming industrialization

Inactive Publication Date: 2020-07-07
SHANDONG VOCATIONAL COLLEGE OF LIGHT IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The third-generation amide-type polycarboxylate water-reducer has more excellent performance, especially in terms of high water-reducing rate, good plasticity and adaptability to cement concrete, but the domestic third-generation amide-type polycarboxylate There are few research reports on water reducers
Although this method has low energy consumption, it will take some time for industrialization

Method used

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  • Highly adaptable multi-branched amidoimide type polycarboxylate water reducer and preparation method thereof
  • Highly adaptable multi-branched amidoimide type polycarboxylate water reducer and preparation method thereof
  • Highly adaptable multi-branched amidoimide type polycarboxylate water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The molecular weight of HPEG is 3000, the molar ratio of the HPEG macromer: AA: XAY: JYQ is 1:3.0:0.3:0.6, and the initiator is H 2 o 2 , its dosage is 1.3wt% of the total mass of the monomer, H 2 o2 The mass ratio to VC is 1:0.3.

[0044] Add HPEG to the reaction bottle, and add quantitative deionized water to make a 50% aqueous solution, turn on the stirring, and raise the temperature to 60°C. AA, XAY, JYQ, VC and a certain amount of water make 40% aqueous solution A, initiator H 2 o 2 Make 2.0% aqueous solution B, and add it dropwise to the bottom liquid at 60°C at the same time. Among them, material A is dripped at a constant speed in 2.0 hours, and material B is dripped at a constant speed in 2.5 hours. After adding material B, continue to keep warm at 60°C for 2.0h. Lower the temperature to below 30°C, adjust the pH to 7.0 with sodium hydroxide, and then add water to adjust the solid content to 30%, which is the multi-branched amidoimide polycarboxylate supe...

Embodiment 2

[0046] The molecular weight of TPEG is 1200, the molar ratio of TPEG macromer: AA: XAY: JYQ is 1:5.0:0.5:0.8, the initiator is APS, and its dosage is 1.0wt% of the total mass of the monomer, and the mass ratio of APS and VC is 1 :0.5.

[0047] Add TPEG to the reaction bottle, and add quantitative deionized water to prepare an aqueous solution with a concentration of 60%, turn on the stirring, and raise the temperature to 50°C. Make AA, XAY, JYQ, VC and a certain amount of water to make 50% aqueous solution A, add water to initiator APS to make 3.0% aqueous solution B, and drop them into the bottom liquid at 50°C at the same time. Among them, material A was dripped at a constant speed in 1.5 hours, and material B was dripped at a constant speed in 2.0 hours. After adding material B, continue to keep warm at 50°C for 1.0h. Lower the temperature to below 30°C, adjust the pH to 7.0 with sodium hydroxide, and then add water to adjust the solid content to 40%, which is the multi-b...

Embodiment 3

[0049] TPEG molecular weight 2400, HPEG molecular weight 3000, the TPEG and HPEG macromonomer: the molar ratio of MAA: XAY: JYQ is 1:4.0:0.6:1.0, and the initiator is Na 2 o 2 , its dosage is 0.8wt% of the total mass of the monomer, N 2 o 2 The mass ratio to VC is 1:0.5.

[0050] Add TPEG and HPEG into the reaction bottle, and add quantitative deionized water to prepare an aqueous solution with a concentration of 65%, turn on the stirring, and raise the temperature to 40°C. Mix AA, XAY, JYQ, VC and a certain amount of water to form a 60% aqueous solution A, the initiator Na 2 o 2 Add water to make 5% aqueous solution B, and drop it into the bottom liquid at 40°C at the same time. Among them, material A is dripped at a constant speed in 2.5 hours, and material B is dripped at a constant speed in 3.0 hours. After adding material B, continue to keep warm at 40°C for 2.0h. Lower the temperature to below 30°C, adjust the pH to 8.0 with sodium hydroxide, and then add water to...

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Abstract

The invention relates to a high-adaptability multi-branched-chain amide imine type polycarboxylate based water reducer and a preparation method thereof, and belongs to the technical field of concreteadditives. The polycarboxylate based water reducer is composed of the following substances: polyether macromonomers, unsaturated acid monomers, branched-chain functional monomer methoxy polyethylene glycol mercaptoacetate, amide imine type functional monomer diethylenetriamine maleate, an initiator, a reducing agent and deionized water, wherein the molar ratio of the polyether macromonomers to theunsaturated acid monomers to the branched-chain monomers to the amide imine type monomers is 1:(2-5):(0.3-0.6):(0.5-1.0). The prepared water reducer has a relatively high water reducing rate and excellent slump retaining performance, and the problem of adaptability between cement concrete and the polycarboxylate based water reducer is also solved. The invention further provides a preparation method thereof. The preparation method comprises four steps, is scientific and reasonable, and is simple and feasible.

Description

technical field [0001] The invention relates to a highly adaptable multi-branched amidoimide type polycarboxylate water reducer and a preparation method thereof, belonging to the technical field of concrete admixtures. Background technique [0002] In the production process of cement, mineral admixtures such as fly ash and slag powder of different qualities are used as mixed materials. Due to the difference between fly ash and mineral powder, it will cause the adaptability of cement concrete and polycarboxylate superplasticizer to a certain extent, and the many domestic cement brands have exacerbated this problem. The poor adaptability is mainly manifested in the phenomenon of no water-reducing plasticizing effect, rapid loss of concrete slump, increased shrinkage and easy cracking. [0003] Polycarboxylate water reducer is the third generation of water reducer after lignin and naphthalene type water reducer. Due to its many advantages, it has been widely used. The molecul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065
Inventor 郭春芳申万意
Owner SHANDONG VOCATIONAL COLLEGE OF LIGHT IND
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