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A kind of cement dispersant and preparation method thereof

A cement dispersant and additive technology, which is applied in the field of cement dispersant and its preparation, can solve the problems of poor dispersibility and achieve the effects of improving mechanical properties, improving surface activity and strong affinity

Active Publication Date: 2021-03-19
江苏仁爱建材科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a cement dispersant and its preparation method in view of the problem that the layered structure of cement clay will produce a large amount of adsorption on polycarboxylate water reducer and its dispersibility is poor

Method used

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  • A kind of cement dispersant and preparation method thereof

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preparation example Construction

[0023] The preparation method of grinding aid additive is:

[0024] Take lauric acid at a mass ratio of 1~3:10~20, add N,N-dimethylformamide and mix, add triisopropanolamine which is 1~3 times the mass of lauric acid, and stir and mix at 50~60°C for 20~40min , then add sodium methoxide with 2-6% lauric acid mass and xylene with 1-3% lauric acid mass, pass through nitrogen protection, stir and mix at 100-110°C for 1-3h, cool to room temperature, and rotate to evaporate to obtain Grinding additives. The surface activity enhancer is: take sodium methacrylic sulfonate and mix it with 2-hydroxyethyl methacrylate phosphate in a mass ratio of 1~3:2~5.

[0025] The coupling agent is: γ-methacryloxytrimethoxysilane, γ-vinyltrimethoxysilane, vinyltris(β-methoxyethoxy)silane, vinyltriethoxysilane Any one or any several of them are mixed in any mass ratio to obtain.

[0026] The preparation method of functional monomer is:

[0027] Take methacrylic acid-N,N-dimethylaminoethyl ester at...

Embodiment 1

[0032] The preparation method of grinding aid additive is:

[0033] Take lauric acid and mix it with N,N-dimethylformamide at a mass ratio of 1:10, add triisopropanolamine with 1 times the mass of lauric acid, stir and mix at 50°C for 20 minutes, then add methanol with 2% mass of lauric acid Sodium and 1% lauric acid in xylene, protected by nitrogen, stirred and mixed at 100°C for 1 hour, cooled to room temperature, and rotary evaporated to obtain the grinding additive. The surface activity enhancer is: take sodium methacrylate and add 2-hydroxyethyl methacrylate phosphate in a mass ratio of 1:2 and mix it.

[0034] The coupling agent is: vinyltriethoxysilane.

[0035] The preparation method of functional monomer is:

[0036]Take N,N-dimethylaminoethyl methacrylate and add absolute ethanol at a mass ratio of 1:10, pass through nitrogen protection, heat up to 85°C, add N,N-dimethylaminoethyl methacrylate dropwise Bromo-n-butane with a quality of 80%, stirred and mixed for 5 ...

Embodiment 2

[0041] The preparation method of grinding aid additive is:

[0042] Take lauric acid and mix it with N,N-dimethylformamide at a mass ratio of 2:15, add triisopropanolamine twice the mass of lauric acid, stir and mix at 55°C for 30 minutes, then add methanol with 4% mass of lauric acid Sodium and 2% lauric acid in xylene, protected by nitrogen, stirred and mixed at 105°C for 2 hours, cooled to room temperature, and rotary evaporated to obtain the grinding additive. The surface activity enhancer is as follows: take sodium methacrylate and add 2-hydroxyethyl methacrylate phosphate in a mass ratio of 2:4 to mix.

[0043] The coupling agent is: vinyl tris(β-methoxyethoxy)silane.

[0044] The preparation method of functional monomer is:

[0045] Take N,N-dimethylaminoethyl methacrylate and add absolute ethanol at a mass ratio of 3:15, pass through nitrogen protection, heat up to 87°C, add N,N-dimethylaminoethyl methacrylate dropwise Bromo-n-butane with a mass of 85%, stirred and ...

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Abstract

The invention discloses a cement dispersant and a preparation method thereof, and belongs to the technical field of concrete additives. An esterification reaction of lauric acid and triisopropanolamine is carried out to introduce hydrophilic anionic phosphate groups and sulfonic groups, so the fluidity of cement is improved; gamma-methacryloxytrimethoxy silane and other coupling agents introducedto the molecular structure of the dispersant enhance the adsorption capacity of a water reducer on the surface of the cement, so the water reducer can easily disperse the cement; N,N-dimethylaminoethyl methacrylate and n-butyl bromide undergo a nucleophilic substitution reaction, so the sensitivity to clay is reduced, and the mud resistance is achieved; and the dispersant is introduced into a polycarboxylic acid water reducer polymer by copolymerization initiation to achieve high dispersion. The problems of generation of massive adsorption and poor dispersibility of the layered structure of existing cement clays to the polycarboxylic acid water reducer are solved in the invention.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a cement dispersant and a preparation method thereof. Background technique [0002] Modern concrete structures are gradually developing in the direction of super high-rise, long-span and complex structural systems, which put forward higher requirements for the mechanical properties and construction performance of concrete, and greatly promoted the development of concrete pumping construction technology. High-strength concrete of C60 and above grades has begun to be used in super high-rise buildings, long-span bridges and super-high cable towers due to its many performance advantages such as improving bearing capacity, reducing structural weight and saving materials. However, the water-binder ratio of high-strength concrete is low, the amount of cementitious material is large, the amount of admixture is high, and the viscosity of the mixture is high, resulting in high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/16C08F283/06C08F220/06C08F228/02C08F230/02C08F220/34C08F230/08C08F222/02C04B103/40
CPCC04B24/165C04B2103/408C08F283/065C08F220/06C08F228/02C08F230/02C08F220/34C08F230/08C08F222/02
Inventor 战英权路芸庞成荣
Owner 江苏仁爱建材科技开发有限公司