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

Polycarboxylate water reducer and preparation method thereof

A technology of water reducing agent and polycarboxylate, which is applied in the field of polycarboxylate water reducing agent and its preparation, which can solve the problems of high concrete shrinkage rate and insufficient water reducing performance, and achieve shrinkage deformation, increase water reducing rate, and strong shrinkage resistance sexual effect

Active Publication Date: 2021-05-14
江苏亚琛材料科技有限公司
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned polycarboxylate water reducer has the problems of insufficient water reduction and high shrinkage of concrete after adding

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
  • Polycarboxylate water reducer and preparation method thereof
  • Polycarboxylate water reducer and preparation method thereof
  • Polycarboxylate water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 90g of acetone, place it under the condition of 10°C, continue to feed nitrogen and stir, take 2.02g of tripropylene phosphite, and add it dropwise to the acetone at a speed of 2d / s. After the dropwise addition, put The aforementioned acetone solution and 8900g of acetone were mixed uniformly to form a solution a, and the temperature of the solution a was raised to 55°C, and at the same time, the nitrogen gas was continuously blown and stirred, and 332g of maleic acid, 44.5g of 3-hydroxyacrylamide, and 450g of polyoxyethylene ether were added to the solution a , wherein the alkyl carbon chain length of polyoxyethylene ether is 7, and the degree of polymerization of oxyethylene ether is 8. Stir until the above-mentioned monomers are all dissolved, and after continuing to stir for 10 minutes, add 3.28g of azobisisobutyronitrile and 4.04g of ten Dialkyl mercaptan, the reaction can be stopped after 6 hours of reaction. After the reacted product is subjected to vacuum d...

Embodiment 2

[0025] Take 60g of acetone, place it under the condition of 10°C, continue to feed nitrogen and stir, take 2.02g of tripropylene phosphite, and add it dropwise to the acetone at a speed of 2d / s. After the dropwise addition, put The aforesaid acetone solution and 5940g of acetone were mixed uniformly to form solution b, and the temperature of solution b was raised to 50°C while continuously blowing nitrogen and stirring, and 174g of fumaric acid, 35.6g of 3-hydroxyacrylamide, and 370.5g of polyoxyethylene ether were added to solution b Among them, the alkyl carbon chain length of polyoxyethylene ether is 12, and the degree of polymerization of oxyethylene ether is 7. Stir until the above-mentioned monomers are all dissolved. After stirring for 10 minutes, add 4.92g of azobisisobutyronitrile and 8.58g of Octadecyl mercaptan, the reaction can be stopped after 5 hours of reaction. After the reacted product is subjected to vacuum distillation at 25° C., the obtained product is the ...

Embodiment 3

[0027] Take 55g of acetone, put it under the condition of 5°C, continuously feed nitrogen and stir, take 0.909g of tripropylene phosphite, drop it into acetone at a speed of 2d / s, after the dropwise addition, put The aforementioned acetone solution and 5445g of acetone were mixed uniformly to form a solution c, and the temperature of the solution c was raised to 60°C, while continuously blowing nitrogen and stirring, and 195g of glutaconic acid, 42.7g of 3-hydroxyacrylamide, and 270g of polyoxyethylene ether were added to the solution c Among them, the alkyl carbon chain length of polyoxyethylene ether is 12, and the degree of polymerization of oxyethylene ether is 6. Stir until the above-mentioned monomers are all dissolved. After stirring for 10 minutes, add 4.92g of azobisisobutyronitrile and 8.58g of Octadecyl mercaptan, the reaction can be stopped after 7 hours of reaction. After the reacted product is subjected to vacuum distillation at 25° C., the obtained product is th...

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 polycarboxylate-based water reducer and a preparation method thereof, and relates to the technical field of cement additives. The polycarboxylate superplasticizer is made of the following components: dibasic carboxylic acid containing ethylenic bond, 3-hydroxyacrylamide, unsaturated phosphite, alkyl alcohol polyoxyethylene ether, azo initiator, fat Group mercaptan chain transfer agent and organic solvent. During preparation, add unsaturated phosphite to organic solvent, then add dibasic carboxylic acid containing ethylenic bond, 3-hydroxyacrylamide and alkyl alcohol polyoxyethylene ether, after it is stirred evenly, add initiator and The chain transfer agent can be obtained after several hours of reaction. By using unsaturated dicarboxylic acid as the polycarboxylic acid matrix, the water reducing rate of the polycarboxylate water reducer is higher than that of conventional water reducers; by introducing amide groups, the polycarboxylate water reducer of the present invention is increased The water reducing rate is high, and the compressive strength of the concrete is not affected; it has strong shrinkage resistance, making the concrete not easy to shrink and deform, and safer to use.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a polycarboxylate water reducer and a preparation method thereof. Background technique [0002] In many concrete projects, traditional high-efficiency concrete such as naphthalene series is increasingly unable to meet engineering needs due to limitations in technical performance. A new generation of water reducer that has attracted much attention at home and abroad, polycarboxylate high-performance water reducer, because it has truly designed an effective molecular structure based on the mechanism of dispersed cement, has a super-dispersion type, and can prevent concrete slump loss. It does not cause obvious retardation, exerts a high plasticizing effect at a low dosage, has good fluidity retention, has a large degree of freedom in adapting to a wide molecular structure of cement, has many synthesis techniques, and has a large room for high performance. T...

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): C08F283/06C08F222/02C08F220/58C08F230/02C04B24/26C04B103/30
CPCC04B24/246C04B2103/302C08F283/06C08F222/02C08F220/58C08F230/02
Inventor 关志文
Owner 江苏亚琛材料科技有限公司