Rust conversion type high-dispersion polycarboxylate superplasticizer and preparation method thereof

A technology of polycarboxylic acid and water reducing agent, applied in the field of polycarboxylate water reducing agent, can solve the problems of dispersibility and corrosion of water-reducing steel bars, improve performance and strength, improve dispersibility and dispersibility retention ability, prevent The effect of corrosion

Active Publication Date: 2021-06-18
LANZHOU PETROCHEM COLLEGE OF VOCATIONAL TECH
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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 provide a new rust-reversing high-dispersion polycarboxylate water-reducer and its The preparation method is to synthesize macromonomers with rust-reducing and water-reducing functions by chemical grafting, and then copolymerize

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039](1) Add 7.2g of acrylamide and 130mL of deionized water into a reactor equipped with a condenser, a thermometer, a constant pressure dropping funnel and a stirrer, stir well for 10min, control the temperature of the reactor at 50°C, and slowly Add 8g formaldehyde solution dropwise, keep warm for 1.5 hours, add 2.2g tannic acid in the reactor, add 0.05g hydrochloric acid and adjust the pH to be 5, control the reaction temperature to be 80°C, cool down to room temperature after reacting for 4.5 hours, and obtain Rust conversion and corrosion inhibition and water-reducing functional macromer solution;

[0040] (2) Take 14.4g of acrylic acid and 3.2g of mercaptoacetic acid and dissolve them in 50mL of deionized water to obtain solution A;

[0041] (3) Get 4g of ammonium persulfate and dissolve it with 50mL of deionized water to obtain solution B;

[0042] (4) Add 15.8 g of sodium methacryl sulfonate and 120 g of allyl polyethylene glycol (molecular weight 2400) to the solut...

Embodiment 2

[0045] (1) Add 6.6g of acrylamide, 1.2g of N-tert-butylacrylamide, and 100mL of deionized water into a reactor equipped with a condenser, a thermometer, a constant pressure dropping funnel, and a stirrer, fully stir for 0.5 hours, and control The temperature of the reactor is 52°C, slowly drop 10g of glyoxylic acid solution within 1 hour, keep the temperature for 1.5 hours, add 2g of gallic acid, 0.5g of glutamic acid, 0.1g of hydrochloric acid and adjust the pH to 5 in the reactor to control the reaction The temperature was 82°C, and after 5 hours of reaction, the temperature was cooled to room temperature to obtain a macromonomer solution with rust-transferring, corrosion-inhibiting and water-reducing functions;

[0046] (2) Take 7.2g of methacrylic acid, 7.2g of hydroxypropyl methacrylate, and 3.6g of mercaptopropionic acid, and dissolve them with 50mL of deionized water to obtain solution A; take 4.8g of ammonium persulfate, and dissolve them with 50mL of deionized water to...

Embodiment 3

[0050] (1) Add 7g of acrylamide, 1.8g of N-tert-butylacrylamide, and 100mL of deionized water into a reactor equipped with a condenser, a thermometer, a constant pressure dropping funnel, and a stirrer, and stir thoroughly for 0.5 hours to control the reaction. The temperature of the reactor is 50°C, slowly drop 8g of benzaldehyde solution in 1 hour, keep the temperature for 1.5 hours, add 1g of glutamic acid, 1.5g of tannic acid in the reactor, add 0.1g of hydrochloric acid and adjust the pH to 4.5, and control the reaction temperature 85°C, react for 5 hours and cool down to room temperature to obtain a macromonomer solution with functions of rust conversion, corrosion inhibition and water reduction;

[0051] (2) Take 7.2g of acrylic acid, 6.5g of hydroxyethyl methacrylate, 2.5g of dodecanethiol, and vitamin C, and dissolve them in 50mL of deionized water to obtain solution A;

[0052] (3) Get 3.2g of ammonium persulfate and dissolve it with 50mL of deionized water to obtain...

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Abstract

The invention discloses a preparation method of a rust conversion type high-dispersion polycarboxylate superplasticizer and the polycarboxylate superplasticizer prepared by the method. The preparation method comprises the following steps: carrying out condensation reaction on an amino-containing unsaturated monomer, aldehyde and natural acid to synthesize a macromolecular monomer which is rich in groups such as hydroxyl and carboxylate radical and has the functions of rust conversion, corrosion inhibition and water reduction; and carrying out free radical copolymerization on monomers such as sodium methallyl sulfonate and acryloyl monomers to obtain the polycarboxylate superplasticizer. The superplasticizer has good dispersing, retarding, water reducing, rust preventing and rust converting functions. According to the present invention, the superplasticizerhas characteristics of good dispersibility and good dispersibility maintaining ability on concrete under the low mixing amount so as to effectively improve the performance and the strength of the concrete, and the superplasticizer is converted into the protective passivation film layer on the steel bar surface after the concrete pouring so as to prevent the steel bar from being corroded in the concrete;.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer, in particular to a rust-reversing high-dispersion polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Following the lignosulfonate water reducer and naphthalene-based water reducer, the third-generation polycarboxylate high-efficiency water reducer has the advantages of high water reducing rate, less dosage, low concrete shrinkage rate, and less environmental pollution. Gradually replace other types of water reducers. From the perspective of molecular structure, the structure of polycarboxylate superplasticizer belongs to comb structure, that is, it is composed of main chain and side chain or branch chain. The main chain generally has polar active groups, and the branch chain has many A hydrophilic active group, the whole structure has a high steric hindrance effect. [0003] Research on polycarboxylate superplasticizers abroad was earlier, and Japan t...

Claims

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Application Information

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IPC IPC(8): C08F283/00C08F283/06C08F228/02C08F220/06C04B24/16C04B103/30
CPCC08F283/00C08F283/065C04B24/165C04B2103/30C08F228/02C08F220/06
Inventor 王有朋梁斌唐蓉萍潘有江宋瑞霞武占全李东旭吴瑞军赫桐桐邸福森蒋文祥苟怡田健龙
Owner LANZHOU PETROCHEM COLLEGE OF VOCATIONAL TECH
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