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Method for preparing powdery polycarboxylic acid hyperdispersant

A technology of hyperdispersant and polycarboxylic acid, which is applied in the field of preparation of powdery hyperdispersant, can solve the problem of high product packaging and transportation costs, easy water absorption and agglomeration, and affect the storage stability of powdery polycarboxylate hyperdispersant products Performance and ease of use and other issues, to achieve the effect of excellent dispersion stability, excellent dispersion, excellent anti-caking performance

Inactive Publication Date: 2011-02-02
SHANGHAI SUNRISE CHEMISTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, polycarboxylate hyperdispersants are mainly circulated and used in the form of liquids, resulting in high packaging and transportation costs, and the disadvantages of being difficult to measure when used on site; in addition, liquid polycarboxylate hyperdispersants cannot be used for dry powder mortar and grouting Materials, powder coatings and other fields
[0004] Since the polycarboxylate hyperdispersant contains a large amount of hydrophilic groups such as polyoxyalkylene and carboxylic acid groups, it is very easy to absorb water and agglomerate when it is prepared into a powdery hyperdispersant, which seriously affects the powdery polycarboxylate superdispersant. Storage stability and ease of use of dispersant products

Method used

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  • Method for preparing powdery polycarboxylic acid hyperdispersant
  • Method for preparing powdery polycarboxylic acid hyperdispersant
  • Method for preparing powdery polycarboxylic acid hyperdispersant

Examples

Experimental program
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Effect test

Embodiment 1

[0038] In the case of stirring, gradually make the specific surface area to 30.0g 25.0m 2 The nano calcium carbonate powder of / g is added gradually in the polycarboxylate polymer solution PC1 of 2.0kg 30.0% solid content, and continue to stir until the polycarboxylate slurry is even. Then the obtained polycarboxylate slurry is atomized by a high-speed centrifugal atomizer at 30,000 rpm, and enters a drying tower with an inlet air temperature of 160° C. for drying and dehydration. At the same time, 30.0 g of 1250 mesh calcium carbonate is blown into the drying tower to separate agent, the speed of adding the polycarboxylate slurry is controlled so that the outlet air temperature of the drying tower is around 85°C. Collect and filter the powder with a 20-mesh square sieve to obtain a powdery polycarboxylate hyperdispersant, denoted as SDP-1.

Embodiment 2

[0040] In the case of stirring, gradually make the specific surface area to 20.0g 300.0m 2 The nano silicon dioxide powder powder of / g is added gradually in the polycarboxylate polymer solution PC2 of 2.0kg 40.0% solid content, and continue to stir until the polycarboxylate slurry is even. Then the obtained polycarboxylate slurry is atomized by a high-speed centrifugal atomizer at 35,000 rpm, and enters a drying tower with an inlet air temperature of 240° C. for drying and dehydration. At the same time, 60.0 g of 1250-mesh talcum powder release agent is blown into the drying tower , The speed of adding the polycarboxylate slurry is controlled so that the outlet air temperature of the drying tower is around 100°C. Collect and filter the powder with a 10-mesh square sieve to obtain a powdery polycarboxylate hyperdispersant, denoted as SDP-2.

Embodiment 3

[0042] In the case of stirring, gradually the specific surface area is 54.0g 50.0m 2The nano titanium dioxide powder of / g is added gradually in the polycarboxylate polymer solution PC3 of 2.0kg 45.0% solid content, and continue to stir until the polycarboxylate slurry is even. Then the obtained polycarboxylic acid slurry is atomized by a 30000rpm high-speed centrifugal atomizer, and enters a drying tower with an inlet air temperature of 140°C for drying and dehydration. At the same time, 18.0g300.0m 2 / g of nano-silica powder powder, the speed of adding the polycarboxylate slurry is controlled to make the outlet air temperature of the drying tower around 70°C. Collect and filter the powder with a 20-mesh square sieve to obtain a powdery polycarboxylate hyperdispersant, designated as SDP-3.

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Abstract

The invention discloses a method for preparing a powdery polycarboxylic acid hyperdispersant. The method comprises the following steps of: a) adding superfine inorganic powder or sol into solution of polycarboxylic acid polymer and uniformly mixing to obtain polycarboxylic acid slurry, wherein the solid content of the solution of polycarboxylic acid polymer is 10 to 60 percent, and the weight ratio of the superfine inorganic powder or sol to the solution of polycarboxylic acid polymer is 0.001 to 20; and b) forming atomized droplets from the polycarboxylic acid slurry which is obtained in the step a by using an atomizer, and introducing the atomized droplets into a dying chamber to dry and dewater; and when the polycarboxylic acid slurry is atomized and dried, simultaneously adding an inorganic separant into the dying chamber to prevent the formed powder from sticking to walls and caking so as to obtain the powdery polycarboxylic acid hyperdispersant. The product obtained by the invention has the advantages of high neat cement paste dispersibility, high dispersion stability and high anti-caking performance.

Description

technical field [0001] The present invention relates to a kind of preparation method of powdery hyperdispersant, more specifically, relate to a kind of preparation method of powdery polycarboxylic acid hyperdispersant. Background technique [0002] At present, the common powder hyperdispersants on the market include naphthalene-based, melamine-based and sulfamic acid-based dispersants, but these dispersants have a high dosage and poor dispersion stability, and the residual naphthalene and formaldehyde will pollute the environment. Therefore, people are committed to finding new hyperdispersants to replace traditional naphthalene-based and melamine-based dispersants. [0003] Polycarboxylate hyperdispersant has the advantages of low dosage, high dispersion performance and dispersion stability, and has been widely used in the fields of concrete, mortar, cement-based self-leveling materials, gypsum-based self-leveling materials and coatings. At present, polycarboxylate hyperdis...

Claims

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Application Information

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IPC IPC(8): C08F290/06C04B103/40C04B24/26
CPCC04B2103/0069C04B40/0042C04B14/02C04B14/28C04B40/0046Y02W30/91C04B24/2694C04B28/02C04B2103/0081C04B20/0092C04B14/042C04B14/303C04B14/305C04B14/306C04B14/308C04B18/146C04B20/0076C04B22/10
Inventor 郑柏存冯中军傅乐峰沈军
Owner SHANGHAI SUNRISE CHEMISTRY CO LTD
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