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Anti-mud polycarboxylate water reducer as well as preparation method and application thereof

A technology of polycarboxylic acid and water-reducing agent, applied in the field of building admixtures, can solve the problems of affecting the use effect of water-reducing agent and concrete strength, inconvenient use of natural zeolite powder and water-reducing agent, and expensive vinyl cationic monomers, etc. , to achieve the effect of increasing water reduction effect, good binding force and effective coating

Active Publication Date: 2019-04-12
詹烨
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The powder and sand materials used in the concrete production process will contain a certain amount of soil and various inorganic salts, such as sulfate, sulfite, etc., these soil and inorganic salts will be adsorbed to the surface of the cement, and polycarboxylic acid Adsorption produces competition, which seriously affects the use effect of water reducing agent and concrete strength
CN101798197A uses compounding method to solve the problem of high mud content in aggregate, but the combination of natural zeolite powder and water reducing agent will bring inconvenience in use, and the addition of retarder will cause concrete retardation, which will bring construction and safety problems. impact on strength
However, the price of vinyl cationic monomer is relatively expensive, which makes the cost of the obtained concrete anti-mud agent relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Preparation of hydroxy silicone oil modified polyether: In a container equipped with a thermometer, a stirrer, a nitrogen air duct and a reflux condenser, add 50 parts of 3 ) 2 O{Si(CH 3 ) 2 O} 3.2 Si(CH 3 ) 2 -OH hydroxy silicone oil, 100 parts of 3-methyl-3-butene-1-polyoxyethylene ether and 1 part of KRA-1, stirred, and blown with nitrogen, raised the temperature to 100°C, and reacted at constant temperature for 2 hours. After the reaction, cool to 60°C and discharge to obtain hydroxy silicone oil modified polyether 1.

[0032] (2) Preparation of esterified monomers: In a container equipped with a thermometer, a stirrer, a nitrogen gas guide tube and a reflux condenser, add 100 parts of polyethylene glycol-200, 200 parts of 4,4-stilbene dicarboxylic acid, 6 parts of p-toluenesulfonic acid, 1 part of hydroquinone and 0.5 part of hydroquinone were stirred, nitrogen gas was passed, the temperature was raised to 90°C, and the reaction was performed at constant ...

Embodiment 2

[0035] (1) Preparation of hydroxy silicone oil modified polyether: In a container equipped with a thermometer, a stirrer, a nitrogen gas guide tube and a reflux condenser, add 40 parts of 3 ) 2 O{Si(CH 3 ) 2 O} 20.5 Si(CH 3 ) 2 -OH hydroxy silicone oil, 100 parts of allyl polyoxyethylene ether and 2 parts of KRA-2, stirred, blown with nitrogen, raised the temperature to 110°C, and reacted at constant temperature for 3 hours. After the reaction is finished, cool to 60°C and discharge to obtain hydroxy silicone oil modified polyether 2.

[0036] (2) Preparation of esterified monomers: In a container equipped with a thermometer, a stirrer, a nitrogen gas guide tube and a reflux condenser, add 100 parts of polyethylene glycol-400, 180 parts of 4,4-stilbene dicarboxylic acid, 8 parts of p-toluenesulfonic acid, 1.5 parts of hydroquinone and 0.75 parts of hydroquinone were stirred, nitrogen gas was passed, the temperature was raised to 80°C, and the reaction was carried out at ...

Embodiment 3

[0039] (1) Preparation of hydroxy silicone oil modified polyether: In a container equipped with a thermometer, a stirrer, a nitrogen gas guide tube and a reflux condenser, add 30 parts of chemical structure HO-Si(CH 3 ) 2 O{Si(CH 3 ) 2 O} 6.8 Si(CH 3 ) 2 -OH hydroxy silicone oil, 100 parts of 2-methallyl polyoxyethylene ether and 0.5 parts of platinum-supported catalyst supported on a silica solid carrier, stirred, and nitrogen gas was introduced, and the temperature was raised to 100 ° C , constant temperature reaction 2h. After the reaction is finished, cool to 60°C and discharge to obtain hydroxy silicone oil modified polyether 3.

[0040] (2) Preparation of esterified monomers: In a container equipped with a thermometer, a stirrer, a nitrogen gas guide tube and a reflux condenser, add 100 parts of polyethylene glycol-600, 220 parts of 4,4-stilbene dicarboxylic acid, 10 parts of p-toluenesulfonic acid, 2 parts of hydroquinone and 1 part of hydroquinone were subjected...

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Abstract

The invention belongs to the technical field of building additives, and relates to an anti-mud polycarboxylate water reducer as well as a preparation method and application thereof. A synthetic product of an unsaturated polyether monomer and hydroxyl silicone oil is used for preparing a polycarboxylate water reducer, a siloxane structure is introduced into the end of the branched chain of the polycarboxylate water reducer molecule, the siloxane structure enables the polycarboxylate water reducer to have stronger resistance to clay, and the steric hindrance effect of the branched chains of themolecule is enhanced; secondly, an esterification product of polyethylene glycol and 4,4-stilbene dicarboxylic acid is introduced, the structure of the benzene ring enables the the branched chains ofthe molecule of the polycarboxylate water reducer to have a steric hindrance effect, and by slow condensation hydrolysis under an alkaline condition, the anti-mud and dispersing retention performancesof the obtained polycarboxylate water reducer are good.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to a mud-resistant polycarboxylate water reducer, a preparation method and an application. Background technique [0002] The polycarboxylate superplasticizer is more sensitive to the clay content of the aggregate, mainly manifested in a severe decrease in the water reducing and dispersing ability of the polycarboxylate superplasticizer, poor slump retention effect, and a decrease in the strength of hardened concrete. In the case of high aggregate mud content, simply increasing the amount of polycarboxylate-based superplasticizers cannot solve the problems of water-reducing rate and slump retention. An important reason for scale promotion. [0003] The powder and sand materials used in the concrete production process will contain a certain amount of soil and various inorganic salts, such as sulfate, sulfite, etc., these soil and inorganic salts will be adsorb...

Claims

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Application Information

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IPC IPC(8): C04B24/16C08F283/12C08F220/06C08F222/02C08G77/46C08G63/676C08G63/91C04B103/30
CPCC04B24/165C04B2103/302C08F283/124C08G63/676C08G63/918C08G77/46C08F220/06C08F222/02
Inventor 詹烨
Owner 詹烨
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