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

One-step preparation of polycarboxylate high-efficiency water reducer with three-arm branched structure

A high-efficiency water-reducing agent and branched structure technology, applied in the field of concrete admixtures, can solve the problems of complex synthesis process and incomplete reaction, and achieve the effects of simple process, good mud resistance, and increased adsorption capacity

Active Publication Date: 2021-11-02
UNIV OF JINAN +1
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method is prepared by esterification, the reaction process is reversible, the reaction is not complete, and multi-step reactions are used, the synthesis process is complex, and it is not suitable for industrialization

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
  • One-step preparation of polycarboxylate high-efficiency water reducer with three-arm branched structure
  • One-step preparation of polycarboxylate high-efficiency water reducer with three-arm branched structure
  • One-step preparation of polycarboxylate high-efficiency water reducer with three-arm branched structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of A solution: In the reactor, add 0.19 g of thioglycolic acid, 1.8 g of cerium ammonium nitrate, 5.3 g of acrylic acid, and 23 g of deionized water, stir to dissolve, and mix well to obtain A solution;

[0031] (2) Solution B preparation: In the reactor, add 0.1 g glycerol, 34 g TPEG2400, 40 g deionized water, stir to dissolve TPEG2400, mix the solution evenly, and obtain B solution;

[0032] (3) Add solution B into the reactor, raise the temperature to 35°C, add solution A dropwise under constant temperature and stirring conditions, the dropping rate is 8 drops / min, and then react at constant temperature for 4 hours after the dropwise addition, after the reaction is completed, cool After reaching room temperature, adjust the pH to 6-7 with liquid caustic soda to obtain a polycarboxylate high-efficiency water reducer (marked as PC1) with a three-arm branched structure.

Embodiment 2

[0034] In this example, a polycarboxylate superplasticizer (marked as PC2) with a three-arm branched structure was prepared in the same manner as in Example 1, except that the amount of ammonium cerium nitrate in step (1) was 0.5 g.

Embodiment 3

[0036] In this example, a polycarboxylate high-efficiency water reducer (marked as PC3) with a three-arm branched structure was prepared in the same manner as in Example 1, except that the reaction time in step (2) was 3 h.

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 a one-step method for preparing a polycarboxylate superplasticizer with a three-arm branched structure, which is characterized in that the method has the following process steps: using a molecular weight regulator: 0.4-1%, acrylic acid: 16-20%, deionized Water: 76-81%, stir to dissolve, mix evenly to obtain A solution; use trihydric alcohol: 0.035-0.4%, unsaturated polyether: 41-47%, oxidant: 0.8-3%, deionized water: 51- 53%, stir to dissolve the unsaturated polyether, and mix evenly to obtain solution B; at 25-40°C, add solution A dropwise to solution B under constant temperature and stirring conditions, the dropping rate is 5-20 drops / min, solution A The volume ratio to solution B is 1:3. After the dropwise addition, react at a constant temperature for 3 to 6 hours. After the reaction is completed, cool to room temperature and adjust the pH to 6 to 7 with liquid caustic soda to obtain a three-arm branched structure. High-efficiency polycarboxylate superplasticizer.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to the preparation of a polycarboxylate high-efficiency water reducer with a three-arm branched structure in one step. Background technique [0002] Polycarboxylate high-efficiency water reducer is an important concrete admixture. It is a random copolymer obtained by free radical polymerization of unsaturated monomers containing carboxyl groups and other unsaturated monomers. Its molecular structure is comb-shaped. It has the characteristics of high water reducing rate, small change in slump over time, and good adaptability to cement. [0003] The addition of polycarboxylate high-efficiency water reducer not only greatly improves the mechanical properties of concrete, but also realizes the modernization of construction technology. Based on the application and development of polycarboxylate high-efficiency water reducer, concrete materials with different prop...

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): C08F293/00C08F283/06C08F220/06C08F2/38C08F2/10C04B24/26C04B103/30
Inventor 裴梅山李梦霞朱召进
Owner UNIV OF JINAN