Preparation method of amphoteric polycarboxylate clay inhibitor

A technology of amphoteric polycarboxylate and clay inhibitors, which is applied in the field of preparation of amphoteric polycarboxylate clay inhibitors, can solve problems affecting the later strength of concrete, reduce strength and durability, increase concrete shrinkage, etc., and achieve shielding It has good dispersion effect, improves the ability to resist clay, and is beneficial to industrial production.

Active Publication Date: 2014-11-19
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although polycarboxylate superplasticizer has many advantages, it also has its own defects. Among them, the raw materials of concrete, especially the mud content in sand and gravel, have a significant impact on the performance of polycarboxylate superplasticizer.
Clay has a strong adsorption effect on polycarboxylate superplasticizer, which can absorb polycarboxylate superplasticizer into its interlayer structure, so that the superplasticizer that interacts with concrete is greatly reduced; and clay has a strong water absorption effect , after mixing, the free water in the slurry will decrease, which will seriously affect the fluidity and slump retention of concrete; increase the shrinkage of concrete, increase the risk of cracking, reduce the strength and durability, and greatly restrict its promotion and application
The impact of clay on concrete can be improved by increasing the amount of polycarboxylate water-reducing

Method used

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  • Preparation method of amphoteric polycarboxylate clay inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In a reactor with a reflux and stirring device, dissolve 2.5 g of unsaturated sulfonate monomer and 1.5 g of methacryloyloxyethyl dimethylamine in 60 g of deionized water, stir to dissolve, and heat up to 60 At ℃, start to add 2.0g ammonium persulfate dissolved in 12g deionized water and 32.5g unsaturated carboxylic acid monomer by dropping at the same time, control the dropwise addition in 1.5 hours, keep the temperature for 4.0 hours, and then cool down to 40 After ℃, use 0.5g of dimethyl sulfate for quaternization for 1 hour, add sodium hydroxide to neutralize to pH = 5-6, and obtain a light yellow viscous transparent liquid, which is an amphoteric polycarboxylic acid Salt clay inhibitor.

Embodiment 2

[0020] In a three-port reactor with reflux and stirring devices, dissolve 3g of unsaturated sulfonate monomer and 1.5g of methacryloyloxyethyl dimethylamine in 65g of deionized water, stir to dissolve, and heat up to 85°C. At the same time, dissolve 2.0g potassium persulfate and 37.5g acrylic acid monomer with 12g deionized water by dropwise addition, control the dropwise addition in 2.0 hours, and keep it warm for 3.0 hours, then cool down to 45°C, use 0.5g sulfuric acid Dimethyl ester was subjected to quaternization reaction for 1 hour, and then neutralized with sodium hydroxide to pH=5-6 to obtain a light yellow viscous transparent liquid, which was an amphoteric polycarboxylate clay inhibitor.

Embodiment 3

[0022] In a three-port reactor with reflux and stirring devices, dissolve 5g of unsaturated sulfonate monomer and 2.5g of methacryloyloxyethyl dimethylamine in 70g of deionized water, stir to dissolve, and heat up to 80°C , start to add 2.0g of sodium persulfate initiator and 35g of methacrylic acid monomer dissolved in 12g of deionized water at the same time by dropwise addition, control the dropwise addition in 2.0 hours, and keep the reaction for 3.5 hours, and then cool down to 40°C, Use 1.0g of diethyl sulfate for quaternization for 1.5 hours, and then neutralize with sodium hydroxide to pH=5-6 to obtain a light yellow viscous transparent liquid, which is an amphoteric polycarboxylate clay inhibitor agent.

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Abstract

The invention discloses a preparation method of an amphoteric polycarboxylate clay inhibitor. The preparation method comprises the following steps: dissolving unsaturated sulfonate monomer and methylpropenylacyloxy ethyldimethylamine in deionized water in a reactor, heating to a certain temperature while stirring, simultaneously adding an initiator and unsaturated carboxylic acid monomer, keeping the temperature to react, cooling to room temperature, carrying out quaternization with diol sulfate, and finally, neutralizing to obtain a light yellow viscous transparent liquid. The amphoteric polycarboxylate clay inhibitor can be compounded with a polycarboxylic acid water reducer as an additive for inhibiting negative influence of clay on the performance of the concrete polycarboxylate water reducer so as to reduce the water reducer consumption by the clay and enhance the sludge resistance of the water reducer. The amphoteric polycarboxylate clay inhibitor has small relative molecular mass and high dispersion speed, can be violently adsorbed on the clay surface, is free of chlorine ions, and has competitive adsorption advantages as compared with the polycarboxylic acid water reducer, thereby reducing the water reducer consumption by the clay and effectively relieving the adverse influence of the clay on the polycarboxylic acid water reducer.

Description

technical field [0001] The invention belongs to the technical field of concrete additives, in particular to a preparation method of an amphoteric polycarboxylate clay inhibitor. Background technique [0002] Polycarboxylate water reducer is the third generation of high-performance water reducer after wood sodium water reducer and naphthalene water reducer, which has the advantages of low dosage, high water reducing rate, small loss of concrete slump Good adaptability and low content of harmful ingredients. It has been widely used in the construction of large national infrastructure projects such as high-speed rail, bridges, airports, and nuclear power. Although polycarboxylate superplasticizer has many advantages, it also has its own defects, among which the raw materials of concrete, especially the mud content in sand and gravel, have a significant impact on the performance of polycarboxylate superplasticizer. Clay has a strong adsorption effect on polycarboxylate superpl...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F228/02C08F220/34C04B24/16
Inventor 张光华刘磊陈淼李俊国朱军锋
Owner SHAANXI UNIV OF SCI & TECH
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