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Method for preparing polycarboxylic compound ceramic water reducing agent

A ceramic water-reducing agent and a polycarboxylic acid-based technology are applied in the field of preparation of a polycarboxylic acid-based composite ceramic water-reducing agent, which can solve the problems of unsatisfactory water-reducing effect and comprehensive performance, no industrialization, poor adaptability of raw materials, etc. , to achieve the effect of simple post-treatment process, reduced slurry moisture content, and low production cost

Inactive Publication Date: 2010-09-22
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The most widely used composite superplasticizers in China are traditional inorganic salt ceramic superplasticizers. Although this type of superplasticizer has a better application effect in some clay materials, it is different from the clay components in various regions of the country. According to the current situation and experimental results, the traditional inorganic composite water reducer has poor adaptability to raw materials from different origins, and its water reducing effect and comprehensive performance cannot meet the needs of modern ceramic manufacturers.
In view of the production cost, the research on organic macromolecular ceramic water reducers is still in the research stage, and has not yet been industrialized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Weigh 21g of maleic anhydride and 2.38g of ammonium persulfate into a four-neck flask, dissolve in distilled water, stir and heat to 80°C. After dissolving the mixture of 210g of acrylic acid and 23.8g of chain transfer agent sodium bisulfite in water, pour it into a separatory funnel and slowly drop it into a four-neck flask. After dripping, raise the temperature to 90°C, and react at a constant temperature for 1.5 hours, add an aqueous solution containing 1.19 g of sodium phosphite, and then keep it warm for 1 hour to obtain the main body of the polycarboxylic acid-based water reducer, that is, acrylic acid-maleic anhydride copolymer.

[0025] (2) When the temperature of the copolymer was lowered to 50° C., 30% NaOH solution was added dropwise to make the pH of the copolymer 8, thereby obtaining a polyacrylic acid-maleic anhydride sodium salt copolymer with a solid content of 78%.

[0026] (3) After uniformly mixing 100 g of sodium salt copolymer, 18 g of sodium t...

Embodiment 2

[0030] (1) Weigh 21g of maleic anhydride and 2.1g of potassium persulfate into a four-neck flask, dissolve in distilled water, stir and heat to 85°C, mix 315g of acrylic acid with 18.9g of chain transfer agent potassium bisulfite After the solution was completely dissolved in water, it was poured into a separatory funnel and slowly added dropwise to a four-neck flask for reaction. After dripping, raise the temperature to 90°C, and react at constant temperature for 2 hours, add a quencher solution containing 1.19 g of sodium phosphite and keep it warm for 1 hour to obtain acrylic acid-maleic anhydride copolymer, the main body of the polycarboxylic acid-based water reducer.

[0031] (2) When the temperature of the copolymer was lowered to 45° C., 35% NaOH solution was added dropwise to make the pH of the copolymer 8, thereby obtaining a polyacrylic acid-maleic anhydride sodium salt copolymer with a solid content of 83%.

[0032] (3) After uniformly mixing 100 g of sodium salt co...

Embodiment 3

[0036] (1) Weigh 36g of maleic anhydride and 12g of sodium persulfate into a four-neck flask, dissolve in distilled water, stir and heat up to 80°C, mix 315g of acrylic acid and 50g of chain transfer agent potassium bisulfite with Dissolved in distilled water, poured into a separatory funnel and slowly added dropwise to a four-neck flask. After dripping, raise the temperature to 95°C, and react at a constant temperature for 2 hours, add an aqueous solution containing 5.1 g of sodium polyphosphate, and keep it for 1.5 hours to obtain an acrylic acid-maleic anhydride copolymer as the main body of a polycarboxylic acid-based water reducer.

[0037] (2) When the temperature of the copolymer was lowered to 50° C., 30% NaOH solution was added dropwise to make the pH of the copolymer 8, thereby obtaining a polyacrylic acid-maleic anhydride sodium salt copolymer with a solid content of 79%.

[0038] (3) After uniformly mixing 100 g of sodium salt copolymer, 16 g of sodium hexametaphos...

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Abstract

The invention discloses a method for preparing a polycarboxylic compound ceramic water reducing agent. The method comprises the following steps of: mixing maleic anhydride, an initiator and water; raising a temperature; adding mixed solution of acrylic acid and an inorganic chain transfer agent; performing a reaction at a constant temperature; adding an inorganic salt quencher to obtain a polycarboxylic water reducing agent main body, namely an acrylic acid-maleic anhydride copolymer; cooling to the temperature of between 40 and 50 DEG C; adjusting the pH value of a reaction system to be between 7 and 8 by using 25 to 35 mass percent NaOH solution to obtain a polycarboxylate copolymer; compounding the polycarboxylate copolymer with an inorganic salt; and dissolving the compound in the water so as to prepare the polycarboxylic compound ceramic water reducing agent. The method has the characteristics of mild reaction conditions without nitrogen for protection, simple synthesis process, low requirement on equipment, low energy consumption, and low production cost. After the compound water reducing agent is added into ceramic slurry, the water content of the slurry is below 38 percent; the thixotropy is good; and combination properties of a ceramic product can be improved.

Description

technical field [0001] The invention relates to the field of water reducers, in particular to a preparation method of a polycarboxylic acid composite ceramic water reducer. Background technique [0002] As an additive, ceramic water reducer is widely used in the process of mud making, pulp refining, glaze making and other processes in the ceramic industry. The application of ceramic water reducer is directly related to the reduction of the cost of ceramic products, the improvement of product quality and the improvement of performance. [0003] At present, the polycarboxylate superplasticizers that have been studied more at home and abroad are mainly used in the cement industry, but less in ceramic production. The polycarboxylate water reducer, which is currently in the laboratory research and development stage, is used in ceramic mud, but there are still problems such as low water reducing rate, poor system stability and compatibility. Therefore, the polycarboxylate superp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/02C08F220/06C08F222/06C08K3/32C04B35/634
Inventor 廖兵计红果庞浩蒋冰艳
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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