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

Defoaming type functional monomer, polycarboxylate superplasticizer and preparing methods of defoaming type functional monomer and polycarboxylate superplasticizer

A technology of functional monomer and water reducing agent, applied in the field of polycarboxylate water reducing agent and its preparation, defoaming type functional monomer, can solve the problem of different sizes, poor effect, defoamer and polycarboxylate reduction. Problems such as poor compatibility and stability of water agents, to achieve the effects of stable structure performance, elimination of residual bubbles, and excellent defoaming function

Inactive Publication Date: 2017-01-04
SICHUAN INSITITUTE OF BUILDING RES
View PDF4 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of the concrete industry and the improvement of various performance requirements of concrete, polycarboxylate superplasticizers have been widely and rapidly applied. However, due to their own molecular structure characteristics, polycarboxylate superplasticizers have strong air-entraining capabilities and are used in concrete preparation. Bubbles of different sizes are introduced during the process, and the air content is too high, which seriously affects the strength, appearance and durability of concrete
[0003] In response to this problem, many studies have proposed to add an appropriate amount of defoamer to the polycarboxylate superplasticizer for compounding to control the air content. However, due to the poor compatibility and stability of the defoamer and polycarboxylate superplasticizer, This method is less effective in controlling air content problems

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
  • Defoaming type functional monomer, polycarboxylate superplasticizer and preparing methods of defoaming type functional monomer and polycarboxylate superplasticizer
  • Defoaming type functional monomer, polycarboxylate superplasticizer and preparing methods of defoaming type functional monomer and polycarboxylate superplasticizer
  • Defoaming type functional monomer, polycarboxylate superplasticizer and preparing methods of defoaming type functional monomer and polycarboxylate superplasticizer

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0041] The preparation method of the polycarboxylate water reducer with defoaming function according to an exemplary embodiment of the present invention comprises the following steps:

[0042] 1) Preparation of defoaming functional monomer: Add polyether-modified silicone oil into a three-necked bottle equipped with a stirring rod, a constant-pressure dropping funnel, and a thermometer, and heat the polyether-modified silicone oil to 60-100°C. Add unsaturated carboxylic acid or acyl chloride containing an acid catalyst to the polyether modified silicone oil dropwise through a constant pressure dropping funnel within 1 to 2 hours, stir while adding dropwise, and continue the esterification reaction after the dropwise addition is completed for 1~ 2 hours, or add the acid anhydride into the polyether modified silicone oil to disperse and dissolve and heat for 1 to 2 hours for esterification reaction, after the reaction, a defoaming type functional monomer containing siloxane and p...

example 1

[0062] 1) Preparation of defoaming type functional monomer containing siloxane and polyether side chain: Add 500 parts by weight of polyether modified silicone oil into a three-necked bottle equipped with a stirring rod, a constant pressure dropping funnel and a thermometer, and heat to 90°C. Add 0.1 parts by weight of 98 wt% concentrated sulfuric acid to 7.9 parts by weight of acrylic acid and add it dropwise to polyether modified silicone oil through a constant pressure dropping funnel in 2 hours, stir, and continue to react for 2 hours after the dropwise addition to obtain silicon-containing Antifoaming functional monomer SPA-1 of oxane and polyether side chain.

[0063] 2) Preparation of polycarboxylate water reducer with defoaming function: Add 4.0 parts by weight of defoaming functional monomer SPA-1, 300 Parts by weight of prenyl alcohol polyoxyethylene polyoxypropylene ether and 200 parts by weight of water are heated to 60°C and stirred to dissolve; 40 parts by weigh...

example 2

[0065] 1) Preparation of defoaming type functional monomer containing siloxane and polyether side chain: Add 500 parts by weight of polyether modified silicone oil into a three-necked bottle equipped with a stirring rod, a constant pressure dropping funnel and a thermometer, and weigh Add 10.3 parts by weight of maleic anhydride to polyether-modified silicone oil to disperse and dissolve, heat to 60°C, stir, and react for 1 hour to obtain the defoaming functional monomer SPA-2 containing siloxane and polyether side chains.

[0066] 2) Preparation of polycarboxylate water reducer with defoaming function: Add 6.5 parts by weight of defoaming functional monomer SPA-2, 360 Parts by weight of methallyl polyoxyethylene polyoxypropylene ether and 240 parts by weight of water are heated to 45°C and stirred to dissolve; 45 parts by weight of methacrylic acid, 15 parts by weight of methyl methacrylate, 0.5 parts by weight of ascorbic acid, 3.5 parts by weight of mercaptoacetic acid and ...

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 provides a defoaming type functional monomer, a polycarboxylate superplasticizer and preparing methods of the defoaming type functional monomer and the polycarboxylate superplasticizer. The preparing method of the defoaming type functional monomer comprises the step that a siloxane chain segment with a defoaming function is introduced into the molecular structure of the defoaming type functional monomer, and the defoaming type functional monomer is obtained. The preparing method of the polycarboxylate superplasticizer with a defoaming function comprises the steps that a siloxane chain segment with a defoaming function is introduced into the molecular structure of the polycarboxylate superplasticizer in a polymerization mode to obtain the polycarboxylate superplasticizer with a defoaming function. The siloxane structure is introduced into the defoaming type functional monomer prepared through the method, and the defoaming type functional monomer has a more excellent defoaming function; besides, no Si-O-C structure is contained in the structure, so that the stability issue appearing due to hydrolysis of the Si-O-C structure is avoided. The polycarboxylate superplasticizer achieves the defoaming function on the premise of not influencing the water reducing effect, and has the water reducing and defoaming integrated function, and the issues such as compatibility and stability appearing due to compounding are avoided.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures in building materials, and specifically relates to a defoaming type functional monomer with defoaming function, a polycarboxylate water reducer and a preparation method thereof. Background technique [0002] It is inevitable to introduce air bubbles in concrete configuration and construction, and air bubbles with a diameter below 50nm can significantly improve the frost resistance, impermeability, and durability of concrete, and can also improve the fluidity and constructability of concrete, thereby improving the quality of concrete. With the development of the concrete industry and the improvement of various performance requirements of concrete, polycarboxylate superplasticizers have been widely and rapidly applied, but polycarboxylate superplasticizers have strong air-entraining ability due to their own molecular structure characteristics, so they are used in concrete preparation. Bu...

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
IPC IPC(8): C08G77/46C08G77/38C08F290/06C08F283/06C08F220/06C04B24/16C04B24/26C04B103/30
CPCC04B24/165C04B24/2694C04B2103/302C08F283/065C08F290/068C08G77/38C08G77/46C08F220/06
Inventor 贾二鹏徐创霞杨小卜毛海勇廖志华张伟刘洋
Owner SICHUAN INSITITUTE OF BUILDING RES