Modified alkali lignin ceramic grind-aid dispersing agent and preparation method thereof

A technology of alkali lignin and dispersant, which is applied in the field of modified alkali lignin ceramic grinding aid dispersant and its preparation, can solve the problems of secondary pollution of solid waste, etc., and achieve excellent cost performance and excellent grinding aid dispersion performance , high efficiency effect

Active Publication Date: 2012-01-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alkali lignin is only soluble in strong alkaline solution, poor water solubility severely limits the application of alkali lignin, resulting in secondary pollution of solid waste
The price of alkali lignin is extremely low, and it has the advantages of rich sources, non-toxicity, and biodegradability. At present, there is no application research on the use of alkali lignin to research and develop ceramic slurry grinding aids and dispersants. Therefore, alkali lignin is improved. The introduction of hydrophilic groups into its molecules improves the dispersion performance, and the development of high-efficiency ceramic grinding aids and dispersants has great social and economic significance for both the ceramic industry and the paper industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Take 100 g of wheatgrass alkali lignin powder and add it to water, adjust the pH value to 10 with NaOH with a mass percentage concentration of 50% under stirring, heat up to 80°C and dissolve it into an aqueous solution with a mass percentage concentration of 40%, add 20 g of sodium sulfite to react for 2 hours; Adjust the pH of the system to 3 with dilute sulfuric acid with a percentage concentration of 20%, add 15g of acrylic acid dropwise, and react at 70°C for 1 hour; then adjust the pH of the system to 12 with NaOH with a concentration of 50% by mass, and add 3g of ammonium persulfate, 8 g of sodium hypophosphite and 8 g of sodium allyl sulfonate were reacted at 85° C. for 5 hours, and a modified alkali lignin ceramic grinding aid and dispersant was obtained after the reaction.

Embodiment 2

[0039] Take 100g of wheatgrass alkali lignin powder and add it to water, adjust the pH value to 9 with NaOH with a mass percentage concentration of 50% under stirring, heat up to 75°C to dissolve into an aqueous solution with a mass percentage concentration of 30%, and add 25g of sodium p-aminobenzenesulfonate React for 2 hours; use dilute sulfuric acid with a concentration of 20% by mass to adjust the pH of the system to 4, add 5g of acrylic acid and 5g of maleic acid dropwise, and react at 80°C for 1.5h; then adjust the pH of the system with NaOH with a concentration of 50% by mass Adjust the value to 11, add 5g of ammonium cerium nitrate, 5g of sodium hypophosphite and 10g of sodium allyl sulfonate, react at 90°C for 3 hours, and obtain a modified alkali lignin ceramic grinding aid dispersant after the reaction.

Embodiment 3

[0041] Take 100g of bamboo pulp alkali lignin powder and add it to water, adjust the pH value to 11 with NaOH with a mass percentage concentration of 50% under stirring, heat up to 85°C to dissolve into an aqueous solution with a mass percentage concentration of 35%, add 15g of sodium metabisulfite and react for 1.5h The pH of the system is adjusted to 3 with dilute sulfuric acid with a concentration of 20% by mass percentage, 20 g of maleic acid is added dropwise, and reacted for 1 h at 75° C.; the pH value of the system is adjusted to 11 with NaOH with a concentration of 50% by mass percentage, and added 3g of ammonium persulfate, 10g of sodium hypophosphite and 6g of sodium allyl sulfonate were reacted at 85°C for 1 hour, and a modified alkali lignin ceramic grinding aid and dispersant was obtained after the reaction.

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PUM

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Abstract

The invention discloses a modified alkali lignin ceramic grind-aid dispersing agent and a preparation method thereof. The preparation method comprises the following steps of: firstly heating an alkali lignin alkaline solution to 75-85 DEG C and adding sulfonating agents; regulating a system PH (Potential of Hydrogen) value to 3-4 by using dilute sulfuric acid, and adding carboxyl-containing materials dropwise; and then regulating the system PH value to 11-12 by using sodium hydroxide; adding initiating agents, sodium hypophosphite and sodium allyl sulfonate to perform a reaction for 1-5 hours at a temperature of 80-90 DEG C; and obtaining the modified alkali lignin ceramic grind-aid dispersing agent after the reaction is completed. A formulation comprises the following reaction materials in parts by weight: 100 parts of alkali lignin, 15-25 parts of sulfonating agent, 10-20 parts of carboxyl-containing material, 2-5 parts of initiating agent, 5-10 parts of sodium hypophosphite, and 5-10 parts of sodium allyl sulfonate. The molecules of the ceramic grind-aid dispersing agent have sulfonic groups, carboxyl and phosphonic acid groups and good water solubility so that a raw-material ball-grinding efficiency can be greatly increased; a raw-material ball-grinding time is shortened; a liquidity and stability of ceramic slurry are improved; and an obvious reinforcing effect on an embryonic plant is realized.

Description

technical field [0001] The invention relates to a ceramic grinding aid dispersant, in particular to a modified alkali lignin ceramic grinding aid dispersant and a preparation method thereof. Background technique [0002] At present, my country's ceramic production mainly adopts wet process, that is, the ceramic raw materials are ball-milled into mud first, then dried and formed, and finally fired. The energy consumption of the ball milling process and spray drying reaches 40% of the total energy consumption and accounts for 70% of the installed capacity. Improving the efficiency of ball milling of raw materials, shortening the time of ball milling and reducing the water content in the mud have important practical significance for energy saving, consumption reduction and production cost reduction of ceramic enterprises. Many studies and productions have shown that adding an appropriate amount of grinding aid and dispersant to ceramic slurry can effectively improve the surfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/00C08F289/00C08H7/00B01F17/50C09K23/50
Inventor 邱学青庞煜霞邓永红楼宏铭杨东杰
Owner SOUTH CHINA UNIV OF TECH
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