Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Early-strength polycarboxylate water reducer and preparation method thereof

A technology of polycarboxylic acid and water-reducing agent, applied in the field of concrete admixtures, can solve the problems of sensitive dosage, negative impact on concrete durability, and will not improve early strength, etc. effect of reactivity

Inactive Publication Date: 2017-05-31
中建西部建设新材料科技有限公司 +2
View PDF4 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common inorganic salts such as chloride, nitrate or sulfate can improve the early strength of concrete to a certain extent, but have a potential negative impact on the durability of concrete
Alcohol amine organic early-strength agents are used in a small amount, and the effect is obvious, but they are sensitive to the dosage. If the dosage is too high, not only will not improve the early strength, but will have the opposite effect.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Early-strength polycarboxylate water reducer and preparation method thereof
  • Early-strength polycarboxylate water reducer and preparation method thereof
  • Early-strength polycarboxylate water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] An early-strength polycarboxylate superplasticizer whose molecular structure is shown in Formula 7, wherein a is 53-55, b is 14-16, d is 94-96, e is 21-23, and c is 2-2. 4, a, b, c, d are all integers; R 1 for CH 3 , R 2 for H, R 3 for H, R 4 For n-hexyl. GPC test average molecular weight is about 45000.

[0037]

[0038]The preparation method of the above-mentioned early-strength polycarboxylate water reducer, the specific steps are:

[0039] (1) The preparation method of maleic acid monoamide is: under an inert atmosphere, n-hexylamine and maleic anhydride are dropped into the reactor, then add solvent DMF and catalyzer benzenesulfonic acid, the quality of n-hexylamine and maleic anhydride total amount The concentration was 40wt%. During the stirring process, the temperature was slowly raised to 40° C., stirred and refluxed for 2 hours, and the solvent DMF was distilled off under reduced pressure to obtain maleic acid monoamide (N-n-hexyl maleic acid monoamid...

Embodiment 2

[0047] The early-strength polycarboxylate superplasticizer of the present invention has a molecular structural formula as shown in Formula 10, wherein a is 73-76, b is 11-13, d is 123-125, e is 45-47, and c is 0, a, b, d are all integers; R 2 for H, R 3 for H, R 4 For cyclohexyl. GPC test average molecular weight is about 60000.

[0048]

[0049] The preparation method of the above-mentioned early-strength polycarboxylate water reducer, the specific steps are:

[0050] (1) The preparation method of maleic acid monoamide is: under an inert atmosphere, cyclohexylamine and maleic anhydride are dropped into the reaction kettle, then add solvent DMF and catalyst p-toluenesulfonic acid, cyclohexylamine and maleic anhydride The mass concentration of the total amount of acid anhydride was 50wt%. During the stirring process, the temperature was slowly raised to 25° C., stirred and refluxed for 3.5 hours, and the solvent DMF was distilled off under reduced pressure to obtain male...

Embodiment 3

[0057] The early-strength polycarboxylate superplasticizer of the present invention has a molecular structural formula as shown in Formula 13, wherein a is 110-112, b is 12-14, d is 50-52, e is 89-91, and c is 0, a, b, d are all integers; R 2 for CH 3 , R 3 for H, R 4 For phenyl. GPC test average molecular weight is about 86000.

[0058]

[0059] The preparation method of the above-mentioned early-strength polycarboxylate water reducer, the specific steps are:

[0060] (1) The preparation method of maleic acid monoamide is: under inert atmosphere, aniline and maleic anhydride are dropped into reactor, then add solvent toluene and catalyst DMAP, the mass concentration of aniline and maleic anhydride total amount is 60wt% , during the stirring process, the temperature was slowly raised to 60° C., stirred and refluxed for 5 h, and the solvent toluene was distilled off under reduced pressure to obtain maleic acid monoamide (N-phenyl maleic acid monoamide). Wherein, the ra...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to an early-strength polycarboxylate water reducer and a preparation method thereof. The preparation method comprises the following steps: maleic anhydride and organic amine are subjected to an acylation reaction to prepare a maleic monoamide monomer; the monomer is copolymerized with polyoxyethylene ether macromonomer, unsaturated monocarboxylic acid and derivatives thereof under the action of an initiator and a chain transfer agent. The polycarboxylate water reducer can be used for effectively improving the early strength of concrete, and has 12h and 24h colloidal mortar compression strength respectively increased by over 18 percent and 12 percent in comparison with those of a conventional commercial early-strength polycarboxylate water reducer.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to an early-strength polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Early-strength water reducer can promote the development of early strength of concrete, shorten the steam curing time of concrete or even eliminate the steam curing process, thereby greatly improving production efficiency and saving energy consumption, which has significant economic and social benefits. [0003] In order to improve the early strength performance of polycarboxylate superplasticizer, the molecular structure of polycarboxylate superplasticizer is mainly modified at present, such as preparing macromonomers with super long side chains, introducing unsaturated amide monomers or Compound other organic or inorganic components. Although the above method can improve the early strength performance of the polycarboxylate superplasticizer to a certain extent, it also has cer...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F228/02C08F220/06C08F222/38C04B24/26C04B24/16C04B103/30
CPCC04B24/165C04B24/2694C04B2103/302C08F283/065C08F228/02C08F220/06C08F222/38
Inventor 刘明李东来吕锐陈景郑广军
Owner 中建西部建设新材料科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com