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

Method for preparing liquid alkali-free accelerator through ring opening of cyclic amide monomer

A technology of cyclic amide and quick-setting agent, which is applied in the field of liquid alkali-free quick-setting agent for cement concrete, to achieve the effect of reducing preparation cost, high early strength and improving early performance

Active Publication Date: 2022-05-06
BEIJING UNIV OF TECH +2
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prepared comb-shaped organic complexing agent not only has excellent ability to complex aluminum ions, but also has outstanding application performance as an accelerator component in cement-based materials, which is conducive to industrialization. There has been no report on this aspect at home and abroad

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
  • Method for preparing liquid alkali-free accelerator through ring opening of cyclic amide monomer
  • Method for preparing liquid alkali-free accelerator through ring opening of cyclic amide monomer
  • Method for preparing liquid alkali-free accelerator through ring opening of cyclic amide monomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The liquid alkali-free quick-setting agent prepared by the ring-opening of the cyclic amide monomer in this embodiment includes the following components in mass percentage:

[0035]

[0036] The liquid alkali-free quick-setting agent prepared by the ring-opening of the cyclic amide monomer of this embodiment is prepared by the following method:

[0037] (1) The preparation of anion initiator: at first 50g cytosine, 6.9g magnesium bromide, 100g mass fraction are 5% dilute hydrochloric acid to join in the reactor, stir and be warming up to 40 ℃, continue feeding N 2 After protection and constant temperature reaction for 2 hours, the precipitate was filtered out, washed once with dilute hydrochloric acid with a mass fraction of 5%, and then the hydrochloric acid was removed by vacuum distillation to obtain an anionic initiator;

[0038] (2) Ring-opening polymerization: Add 100g of cytosine and 0.5g of 2,4-toluene diisocyanate into the reactor, stir and heat up to 60°C f...

Embodiment 2

[0042] The liquid alkali-free quick-setting agent prepared by the ring-opening of the cyclic amide monomer in this embodiment includes the following components in mass percentage:

[0043]

[0044]

[0045] The liquid alkali-free quick-setting agent prepared by the ring-opening of the cyclic amide monomer of this embodiment is prepared by the following method:

[0046] (1) The preparation of anionic initiator: at first 50g 5-methylcytosine, 5.7g magnesium bromide, 200g mass fraction are 10% dilute hydrochloric acid to join in the reactor, stir and be warming up to 45 ℃, continue feeding N 2 After protection and constant temperature reaction for 3 hours, the precipitate was filtered out, washed twice with dilute hydrochloric acid with a mass fraction of 10%, and then the hydrochloric acid was removed by vacuum distillation to obtain an anionic initiator;

[0047] (2) Ring-opening polymerization: Add 100g of 5-methylcytosine and 1g of 2,6-toluene diisocyanate into the rea...

Embodiment 3

[0051] The liquid alkali-free quick-setting agent prepared by the ring-opening of the cyclic amide monomer in this embodiment includes the following components in mass percentage:

[0052]

[0053]

[0054] The liquid alkali-free quick-setting agent prepared by the ring-opening of the cyclic amide monomer of this embodiment is prepared by the following method:

[0055] (1) The preparation of anionic initiator: at first 50g 5-fluorocytosine, 5.1g magnesium bromide, 300g mass fraction are 15% dilute hydrochloric acid to join in the reactor, stir and be warming up to 50 ℃, continue feeding N 2 After protection and constant temperature reaction for 4 hours, the precipitate was filtered out, washed 3 times with dilute hydrochloric acid with a mass fraction of 15%, and then decompressed to distill off the hydrochloric acid to obtain an anionic initiator;

[0056] (2) Ring-opening polymerization: Add 100g of 5-fluorocytosine and 1.5g of 1,6-hexamethylene diisocyanate into the r...

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

PropertyMeasurementUnit
strengthaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for preparing a liquid alkali-free accelerator by ring opening of a cyclic amide monomer, which comprises the following steps of: performing ring opening polymerization, performing amidation reaction to synthesize a comb-shaped organic complexing agent, and compounding multiple components to prepare the liquid alkali-free accelerator, namely performing ring opening polymerization on the cyclic amide monomer to prepare a polymer main chain; then carrying out amidation reaction with small molecule polypeptide to obtain a comb-shaped organic complexing agent, and compounding the comb-shaped organic complexing agent with aluminum sulfate, montmorillonite powder, alcohol amine and the like to obtain the liquid alkali-free accelerator. According to the method, the self-made comb-shaped organic complexing agent is adopted and can be widely applied to preparation of the liquid alkali-free accelerator, the stability of the accelerator is greatly improved, the problems of precipitation and layering of the accelerator and the like are well solved, the self-made comb-shaped organic complexing agent is applied to a cement-based material, the setting rate of the cement-based material can be effectively increased, and the early strength is improved; compared with the conventional liquid alkali-free setting accelerator, the liquid alkali-free setting accelerator has the advantages of high later strength retention rate, no shrinkage, better action effect and application adaptability, and wide market prospect.

Description

technical field [0001] The present invention relates to the technical field of a liquid alkali-free quick-setting agent for cement concrete, in particular to a method of synthesizing a comb-shaped organic complexing agent by ring-opening a cyclic amide monomer and then compounding multiple components to obtain a liquid alkali-free accelerator. Preparation. Background technique [0002] Accelerator is an admixture that can make concrete set and harden quickly. Shotcrete is widely used in tunnel engineering, slope support, bridge construction and many other fields, and accelerator has become one of the indispensable admixtures of shotcrete due to its excellent characteristics of quick setting and early strength. Due to the large amount of dust during construction, traditional powder accelerators are very harmful to the health of construction workers. Due to the high alkali content of alkaline accelerators, alkali-aggregate reactions will occur in the later stage and seriously...

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): C04B24/28C08G69/20C08G69/48C04B103/12
CPCC04B40/0046C08G69/20C08G69/48C04B2103/12C04B24/287C04B22/148C04B24/122C04B14/104C04B22/165C04B24/123C04B24/04C04B24/06Y02W30/91
Inventor 刘晓谢辉张宇宁杨维刚杨健王子明罗奇峰赵一霖郑旭
Owner BEIJING UNIV OF TECH
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