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

Preparation method of polycarboxylic acid admixture for reducing viscosity of concrete

A technology of polycarboxylic acid and admixture, which is applied in the field of preparation of polycarboxylic acid admixture, can solve the problems of increasing the viscosity of fresh concrete and reducing the concrete water-cement ratio, and achieve the effect of reducing viscosity and solving contradictions

Pending Publication Date: 2021-02-19
CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP +2
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The occurrence of the above two situations has greatly increased the viscosity of the freshly mixed concrete.
On the other hand, with the gradual enlargement of buildings, the demand for high-strength concrete in various projects is also increasing, and the grade of concrete is also getting higher and higher, which leads to the reduction of concrete water-binder ratio.

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
  • Preparation method of polycarboxylic acid admixture for reducing viscosity of concrete
  • Preparation method of polycarboxylic acid admixture for reducing viscosity of concrete
  • Preparation method of polycarboxylic acid admixture for reducing viscosity of concrete

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028]Such asfigure 1As shown, the preparation method of the polycarboxylic acid admixture for reducing the viscosity of concrete in the embodiment of the present invention includes the following steps:

[0029]In step 11, the cyclic polyether and deionized water are configured into an intermediate solution, and the temperature of the intermediate solution is maintained at a preset first temperature.

[0030]In the technical scheme of the present invention, a variety of cyclic polyethers can be used to prepare the above-mentioned intermediate solution.

[0031]For example, as an example, in a preferred embodiment of the present invention, the molecular weight of the cyclic polyether is 1500-2700.

[0032]For another example, as an example, in a preferred embodiment of the present invention, the cyclic polyether is an itaconate type cyclic polyether.

[0033]For another example, as an example, in another preferred embodiment of the present invention, the itaconate cyclic polyether is a substance ha...

specific Embodiment 1

[0059]Dissolve 60 parts of cyclic polyether (molecular weight 1500) in 80 parts of deionized water, stir evenly until completely dissolved, prepare an intermediate solution, and heat the intermediate solution to 60°C and maintain the temperature; then, add 15.2 Acrylic acid, 0.7 part ammonium persulfate, 0.1 part mercaptopropionic acid were added and dissolved in 30 parts of water to form a solution as a dropping liquid; in 2.5 hours, the dropping liquid was added uniformly while stirring In the intermediate solution in the reaction kettle; after the dripping is completed, keep the temperature of the solution at 60° C., and then stir for 1.5 hours to complete, to obtain the polycarboxylic acid admixture.

specific Embodiment 2

[0061]Dissolve 60 parts of cyclic polyether (molecular weight 2000) in 100 parts of deionized water, stir evenly to completely dissolve, prepare an intermediate solution, and heat the intermediate solution to 70°C and maintain the temperature; then, add 7.2 Acrylic acid, 0.5 part ammonium persulfate, 0.15 part mercaptopropionic acid were added and dissolved in 30 parts of water to form a solution as a dripping liquid; in 1.5 hours, while stirring, the dripping liquid was added uniformly In the intermediate solution in the reaction kettle; after the dripping is completed, keep the temperature of the solution at 70°C, and then stir for 1.5 hours to complete, to obtain the polycarboxylic acid admixture.

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 preparation method of a polycarboxylic acid admixture for reducing the viscosity of concrete. The method comprises the steps: preparing an intermediate solution from cyclic polyether and deionized water, and keeping the temperature of an intermediate solution at a preset first temperature; preparing a solution from an acrylic monomer, an initiator and a chain transfer agent, and taking the solution as a dropwise adding solution; uniformly adding the dropwise adding solution into the intermediate solution within a preset first duration, and continuously stirring; and after dropwise adding is completed, continuously keeping the temperature at the preset first temperature, and stirring for a preset second duration, so as to obtain the polycarboxylic acid admixture. The polycarboxylic acid admixture capable of being used for reducing the viscosity of fresh mixed concrete can be prepared by applying the preparation method disclosed by the invention.

Description

Technical field[0001]This application relates to the technical field of concrete admixtures, in particular to a method for preparing a polycarboxylic acid admixture for reducing the viscosity of concrete.Background technique[0002]With the continuous progress of my country's infrastructure construction, natural concrete aggregates have been depleted day by day. Therefore, in recent years, the use of artificial aggregates such as machine-made sand, tailings sand, and construction solid waste has gradually become common. Artificial aggregate is a product produced by mechanically changing the original state of solid matter. Its gradation is far from natural river sand, the gradation fault phenomenon is very serious, and the proportion of needle-flaky grains is large. At the same time, with the requirements of improving efficiency and reducing costs, cement has become finer and finer. The appearance of the above two situations greatly increases the viscosity of fresh concrete. On the oth...

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): C04B24/32C04B103/30
CPCC04B24/32C04B2103/302
Inventor 郭诚冯宁宁王垚董红静樊伟
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP