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Chlorion-free amphiprotic polycarboxylic acid high-performance water reducing agent and preparation method thereof

An amphoteric, polycarboxylic acid technology, used in the field of concrete admixture synthesis, can solve the problems of poor dispersibility and water-reducing effect, low early compressive strength, steel corrosion hazards, etc., to eliminate steel corrosion and excellent plastic retention performance. , the effect of no environmental pollution

Inactive Publication Date: 2017-01-04
LIMING VOCATIONAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a chloride-ion-free amphoteric polycarboxylate high-performance water reducer and its preparation method to solve the problems of poor dispersibility and water-reducing effect in today's commercially available polycarboxylate water reducers , large slump loss and low early compressive strength, and solve the potential harm caused by the chloride ion contained in the commercially available polycarboxylate water reducer to the corrosion of steel bars in reinforced concrete, etc.

Method used

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  • Chlorion-free amphiprotic polycarboxylic acid high-performance water reducing agent and preparation method thereof
  • Chlorion-free amphiprotic polycarboxylic acid high-performance water reducing agent and preparation method thereof
  • Chlorion-free amphiprotic polycarboxylic acid high-performance water reducing agent and preparation method thereof

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preparation example Construction

[0037] Such as figure 1 As shown, the preparation method of the chlorine ion-free amphoteric polycarboxylate high-performance water reducer provided by the embodiment of the present invention includes the following steps:

[0038] S101: Add 24.3g to 16.2g of acrylic acid monomer and 9.9g to 39.6g of ammonium methacryloyloxyethyldimethylpropanesulfonate in 36.6mL-24.3mL, 15.0mL-60.0mL, and 63mL of deionized water, respectively Amphoteric monomer and 41.4g of polyethylene glycol monomethyl ether acrylate macromer, the preparation mass fraction is the mixed monomer solution and mass fraction of acrylic acid and methacryloyloxyethyl dimethyl propane sulfonate ammonium The fraction is 40% polyethylene glycol monomethyl ether acrylate macromer solution for standby;

[0039] S102: Then, in a four-necked flask equipped with a thermometer, a stirrer, a peristaltic pump feeding device and a constant temperature water bath (working temperature is -5°C to 100°C); first add polyethylene g...

Embodiment 1

[0048] Add 24.3g of acrylic acid monomer, 9.9g of ammonium methacryloxyethyl dimethyl propanesulfonate amphoteric monomer and 41.4g of polyethylene glycol monomethyl ether into 36.6mL, 15.0mL, and 63mL of deionized water, respectively. Acrylate macromolecular monomer, the preparation mass fraction is 40% the mixed monomer solution of acrylic acid and methacryloyloxyethyl dimethyl propane sulfonate ammonium and the mass fraction is 40% polyethylene glycol monomethyl ether acrylate The macromolecular monomer solution is ready for use; then in a four-necked flask equipped with a thermometer, a stirrer, a peristaltic pump feeding device and a constant temperature water bath (working temperature is -5°C to 100°C), first add polyethylene glycol monomethanol Ether acrylate macromer standby liquid, start the stirrer (stirring speed is 45r / min), when the temperature reaches the set temperature of the constant temperature water bath, add a certain amount of chain transfer agent thioglyco...

Embodiment 2

[0058] It is basically the same as Example 1, the difference is:

[0059] Preferably, the chain transfer agent thioglycolic acid used in the step is 1.2% (accounting for the total mass of the reaction monomers).

[0060] Preferably, the mass ratio of the strong oxidant hydrogen peroxide to the reducing agent ferrous sulfate in the step is 0.9:1.

[0061] Preferably, the time for adding the reducing agent ferrous sulfate in the step is 1.5h.

[0062] Preferably, the reaction temperature in the step is 10°C.

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Abstract

The invention discloses a chlorion-free amphiprotic polycarboxylic acid high-performance water reducing agent and a preparation method thereof. The preparation method comprises the following steps: preparing an acrylic acid and methylacryloyloxyethyl dimethyl ammonium propanesulfonate mixed monomer solution and a polyethylene glycol monomethyl ether acrylate macromonomer solution; adding a chain transfer agent mercaptoacetic acid and a strong oxidant hydrogen peroxide; respectively dropwise adding the acrylic acid and methylacryloyloxyethyl dimethyl ammonium propanesulfonate mixed monomer solution and a reducing agent ferrous sulfate; and performing precipitation, washing, filtering and vacuum drying to obtain the chlorion-free amphiprotic polycarboxylic acid high-performance water reducing agent. According to the invention, by reasonably selecting the preparation monomer, a chlorion-free amphiprotic polycarboxylic acid high-performance water reducing agent can be obtained so as to eliminate potential hazard caused by rebar corrosion in reinforced concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete admixture synthesis, and in particular relates to a chlorine ion-free amphoteric polycarboxylate high-performance water reducer and a preparation method thereof. Background technique [0002] With the official operation of the Asian Infrastructure Investment Bank and the in-depth implementation of the national "Belt and Road" strategy, the construction of major engineering projects such as roads, bridges, railways, dams, oceans, ports and nuclear power will be accelerated. Modern concrete structures rely on high-performance concrete technology. High-performance concrete has been widely used in the field of infrastructure construction due to its wide source of raw materials, low price, simple preparation process and high strength. High-performance concrete has become the largest building material used in modern infrastructure concrete projects in Asia and even in the world. The output of high-perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/38C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F283/065C08F220/387
Inventor 陈宝璠卓玲
Owner LIMING VOCATIONAL UNIV
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