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Amphoteric mud-resistant polycarboxylate superplasticizer

An anti-mud type, polycarboxylic acid technology, applied in the field of amphoteric anti-mud type polycarboxylate water reducer, can solve the problem that the polyether side chain is not easy to stretch, it is difficult to play steric hindrance, the dispersibility of the water reducer is reduced, etc. problems, to avoid incompatibility, inhibit water swelling, and reduce adsorption.

Inactive Publication Date: 2021-12-07
SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of phenolic alcohol head and propylene oxide will seriously reduce the compatibility of the water reducer in water, and the polyether side chain is not easy to be stretched in the cement pore liquid, and it is difficult to play a role of steric hindrance, so that the water reducer Dispersion is greatly reduced

Method used

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  • Amphoteric mud-resistant polycarboxylate superplasticizer
  • Amphoteric mud-resistant polycarboxylate superplasticizer
  • Amphoteric mud-resistant polycarboxylate superplasticizer

Examples

Experimental program
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Effect test

Embodiment 1

[0021] This embodiment provides an amphoteric anti-mud type polycarboxylate superplasticizer, the preparation method of which is as follows:

[0022] Take 54 parts of acrylic acid, 5 parts of allyltrimethylammonium chloride, and 35 parts of water, mix well, and mark it as liquid A; take 0.9 parts of vitamin C, 2 parts of mercaptoethanol, and 20 parts of water, mix well, and mark it as liquid B liquid.

[0023] Take 450 parts of isopentenyl polyethylene glycol ether and 380 parts of water, mix and stir until the isopentenyl polyethylene glycol ether is completely dissolved, and start the reaction at 30°C, add 5 parts of hydrogen peroxide while stirring, and then start dripping at the same time Add liquid A and liquid B, control the time of adding liquid A to 2 hours, and the time of adding liquid B to 2.5 hours, after the end of the dropping, keep warm for 1 hour.

[0024] Sodium hydroxide solution was added to adjust the pH value to 7 to obtain an amphoteric mud-resistant pol...

Embodiment 2

[0026] Take 39 parts of acrylic acid, 6 parts of allyltrimethylammonium chloride, and 32 parts of water, mix well, and mark it as liquid A; take 0.8 parts of vitamin C, 1.6 parts of mercaptoethanol, and 20 parts of water, mix well, and mark it as liquid B liquid.

[0027] Take 400 parts of ethylene glycol monovinyl polyglycol ether and 400 parts of water, mix and stir until the ethylene glycol monovinyl polyglycol ether is completely dissolved, start the reaction at 20°C, add 3 parts of hydrogen peroxide while stirring, Then start to add liquid A and liquid B dropwise at the same time, control the time for adding liquid A to 0.4h, and the time for adding liquid B to be 1h, after the end of dropping, keep warm for 0.5h.

[0028] Sodium hydroxide solution was added to adjust the pH value to 7 to obtain an amphoteric mud-resistant polycarboxylate superplasticizer.

Embodiment 3

[0030] This embodiment provides an amphoteric anti-mud type polycarboxylate superplasticizer, the preparation method of which is as follows:

[0031] Take 57 parts of methacrylic acid, 5 parts of allyltrimethylammonium chloride, and 55 parts of water, mix well, and mark it as liquid A; take 1 part of vitamin C, 7 parts of sodium hypophosphite, and 40 parts of water, mix well, Labeled as liquid B.

[0032] Take 550 parts of isopentenyl polyethylene glycol ether and 500 parts of water, mix and stir until the isopentenyl polyethylene glycol ether is completely dissolved, add 6 parts of ammonium persulfate under stirring, start the reaction at 35°C, and then simultaneously Start to add liquid A and liquid B dropwise, control the time for adding liquid A to 1.5h, and the time for adding liquid B to be 2h, after the end of dropping, keep warm for 1h.

[0033] Sodium hydroxide solution was added to adjust the pH value to 7 to obtain an amphoteric mud-resistant polycarboxylate superp...

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Abstract

The invention discloses an amphoteric mud-resistant polycarboxylate superplasticizer. Unsaturated quaternary ammonium salt monomers are introduced to obtain the amphoteric mud-resistant polycarboxylate superplasticizer. The specific preparation process is as follows: under an oxidation-reduction initiation system, unsaturated carboxylic acid monomers, unsaturated polyether monomers and the unsaturated quaternary ammonium salt monomers are subjected to free radical polymerization reaction in a water phase to obtain the mud-resistant polycarboxylate superplasticizer. The preparation method is simple and easy to implement and stable in process, the cationic quaternary ammonium salt in the synthesized amphoteric mud-resistant polycarboxylate superplasticizer can effectively inhibit expansion of a clay layered structure, water absorbed by clay expansion can be reduced, and the intercalation effect of polyether side chains of the polycarboxylate superplasticizer in the clay layered structure can be reduced; and anionic carboxylic acid in the amphoteric mud-resistant polycarboxylate superplasticizer can form an electrostatic adsorption effect on the surfaces of cement particles, so that the effect of effectively dispersing concrete is achieved. Moreover, the dispersion retentivity and adaptability of the amphoteric mud-resistant polycarboxylate superplasticizer are improved, and the workability of concrete can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of concrete admixture synthesis, and in particular relates to an amphoteric mud-resistant polycarboxylate water reducer. Background technique [0002] Concrete admixtures are known as the fifth component in concrete and are an essential component for high-performance concrete applications. As the most important admixture in concrete admixture, water reducing agent plays an important role in concrete construction. In recent years, polycarboxylate superplasticizer has developed into the largest concrete admixture because of its low dosage, high water reducing rate, and environmental friendliness. [0003] However, with the rapid development of the construction industry, the quality of sand and gravel resources has declined sharply, and the mud content in sand and gravel aggregates has increased significantly, and the main components of aggregate mud include bentonite, muscovite, etc. Some of these clay minera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F226/02C08F220/34C08F222/06C04B24/26C04B103/30
CPCC08F283/065C04B24/2694C04B2103/302C08F220/06C08F226/02C08F220/34C08F222/06
Inventor 毛玉成傅乐峰冯中军
Owner SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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