Unlock instant, AI-driven research and patent intelligence for your innovation.

A cement-based material dispersant suitable for low-temperature construction and its preparation method

A cement-based material and dispersant technology, applied in the field of cement-based material dispersant, can solve the problems of reduced dispersion performance, increased concrete fluidity, concrete bleeding and segregation, etc.

Active Publication Date: 2021-04-20
JIANGSU SOBUTE NEW MATERIALS +1
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the dispersing performance of traditional polycarboxylate cement dispersants decreases in winter, if the dosage is increased to improve the dispersing effect, it is easy to reverse the increase in the fluidity of concrete in the later stage, resulting in bleeding and segregation of concrete. The present invention provides a suitable Cement-based material dispersant for construction at low temperature and preparation method thereof

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
  • A cement-based material dispersant suitable for low-temperature construction and its preparation method
  • A cement-based material dispersant suitable for low-temperature construction and its preparation method
  • A cement-based material dispersant suitable for low-temperature construction and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0069] 1. Preparation of Monomer D

[0070] (1) D1: prepared by reacting 3-thiophenecarboxylic acid with polyethylene glycol monomethyl ether (MPEG350, number average molecular weight 350, m=8, n=0, sourced from Sigma-Aldrich).

[0071] Compound 3-thiophenecarboxylic acid (13.45g, 0.105mol) and MPEG350 (35g, 0.1mol) were mixed with 500mL CHCl 3 Dissolved, DMAP (0.125g, 1mmol) was added thereto, DCC (22.67g, 0.11mol) dissolved in CHCl was added dropwise at room temperature 3 (200mL) solution, added dropwise for 2h, a white precipitate appeared in the system, continued to stir for 2h after the dropwise addition, filtered, and distilled under reduced pressure, the resulting liquid was distilled with CHCl 3 Dissolve, then precipitate with ether, centrifuge to take the lower layer, and repeat the resulting liquid with CHCl 3 / diethyl ether precipitation twice, and vacuum-dried the final product to obtain monomer D1 with a yield of 91%.

[0072] (2) D2: Prepared by reacting 2-(3-...

Embodiment 1

[0094] Add water / acetonitrile mixed solvent (water 21.25g, acetonitrile 186.9g) in reactor, then add thiophene (TP, 1.8g, 21.4mmol), 2-(3-thienyl)-acetic acid (TP-3- AcA, 17.32 g, 121.8 mmol), 2-(3-thienyl)-ethanesulfonate sodium (TP-3-ESNa, 1.37 g, 6.4 mmol) and polyethylene glycol monomethyl ether-3-thienylcarboxylic acid Ester (D1, number average molecular weight 460.2, 29.5g, 64.1mmol), stirred to dissolve completely, adjusted the solution temperature to 20°C, adjusted the pH of the solution to 3 with NaOH, and added FeCl once under stirring 3 A solution dissolved in water / acetonitrile mixed solvent (34.67g, 213.7mmol, dissolved in 21.25g water and 186.9g acetonitrile), reacted for 6h, neutralized to pH8 with NaOH, extracted all volatile components under reduced pressure, especially volatile Add water to dissolve the small organic molecules, dilute and filter, remove the organic phase and insoluble matter, and dry after dialysis to obtain the required concrete dispersant S...

Embodiment 2

[0096] Add water / acetone mixed solvent (water 144.65g, acetone 36.15g) in the reactor, then add 3-methylthiophene (3-MeTP, ​​3.11g, 31.7mmol), 2-(3-thienyl)- Malonic acid (TP-3-PDA, 11.42g, 61.3mmol), 2-(3-thienyl)-ethanesulfonate sodium (TP-3-ESNa, 13.14g, 61.3mmol) and poly(ethylene oxide -Propylene oxide) monomethyl ether-2-(3-thienyl) acetate (D2, number average molecular weight 11200, 47.34g, 4.2mmol), stir to dissolve completely, adjust the solution temperature to 20°C, and use NaOH Adjust the pH of the solution to 5, and add Fe at one time under stirring 2 (SO 4 ) 3 A solution (63.38g, 158.5mmol, 144.65g of water and 36.15g of acetone) dissolved in water / acetone mixed solvent was reacted for 12h, neutralized to pH8 with NaOH, and all volatile components, especially volatile organic Small molecules, add water to dissolve, dilute and filter, remove the organic phase and insoluble matter, and dry after dialysis to obtain the required concrete dispersant S2, with a weigh...

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 discloses a cement-based material dispersant suitable for low-temperature construction and a preparation method thereof. The cement-based material dispersant is a comb-shaped cement dispersant, the main chain of which is a polythiophene conjugated ring chain substituted by substituents, and the side chain is composed of ethoxy and / or isopropoxy groups as repeating units The water-soluble polyether long chain; the weight average molecular weight of the cement-based material dispersant is 8000-100000. The cement-based material dispersant of the present invention, under low temperature conditions (<5 o C), such as winter construction, the amount of dispersant to achieve the fluidity required for construction can be reduced by 10-25% compared with the traditional polymer admixture, the mixing time is significantly shortened, and it can effectively prevent the work caused by the bleeding and segregation of concrete in the later stage Sexual defects.

Description

technical field [0001] The invention relates to the field of dispersants for cement-based materials, in particular to a dispersant for cement-based materials suitable for low-temperature construction and a preparation method thereof. Background technique [0002] The term "concrete" is used here generally indiscriminately to mean concrete such as concrete, mortar or grout, and this applies elsewhere in this document as well. [0003] Since the invention of high-performance water reducer (polycarboxylate water reducer), it has been widely used and developed greatly, and it has become an indispensable component in concrete. Generally, the polycarboxylate superplasticizer is a comb-shaped structure, which is generally prepared by free radical polymerization of vinyl monomers, and its main chain (generally -CH 2 -CH 2 -Structure or functional group substituted -CH 1 -CH 2 - structure) is connected with charged functional groups (such as carboxyl, sulfonic acid and phosphoric...

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 Patents(China)
IPC IPC(8): C08G61/12C04B24/16C04B103/40
CPCC04B24/166C04B2103/408C08G61/126C08G2261/122C08G2261/1412C08G2261/1424C08G2261/1426C08G2261/143C08G2261/1452C08G2261/3223
Inventor 舒鑫冉千平杨勇黄振张建纲毛永琳严涵李申桐曹攀攀
Owner JIANGSU SOBUTE NEW MATERIALS