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Dispersant for wet grinding of heavy calcium carbonate and preparation method thereof

A technology of heavy calcium carbonate and wet grinding, which is applied in the direction of fibrous filler, dyeing physical treatment, dyeing organic silicon compound treatment, etc. It can solve the problems of high initial viscosity, low initial viscosity, and thickening of inorganic pigment slurry. Achieve good dispersion stability, low initial viscosity and good aging stability

Inactive Publication Date: 2008-07-30
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But, the problem that these dispersing agents exist is, the initial viscosity of the inorganic pigment slurry obtained with these dispersing agents is high, and the aging stability of inorganic pigment slurry also can't meet the requirement, for example: make 75% (weight) When calcium carbonate slurry, the initial viscosity is low, with the passage of time, the viscosity will increase significantly
Another problem is that it is difficult to obtain high concentration and fine particles when calcium carbonate is wet pulverized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 247.24 g of deionized water to a 1-liter four-neck flask equipped with a stirring, thermometer, condenser, nitrogen gas inlet pipe and monomer feeding pipe, raise the temperature to 90 ° C under nitrogen filling and stirring conditions, and put 2.3 g of Ammonium sulfate was dissolved in 40g deionized water to form an initiator solution and a mixed solution composed of 288g (meth)acrylic acid and 2.88g molecular weight regulator mercaptoethanol was added linearly dropwise at the same time, and the dropping time was 2 hours.

[0037] After the dropwise addition, keep the reaction at 90±2°C for 2 hours, then cool to 45°C and add 330g of sodium hydroxide solution with a weight concentration of 50% dropwise to make the pH of the reaction solution 7.52, and finally cool to 30°C to discharge, measure The weight average molecular weight is 2780.

Embodiment 2

[0039] In a 1-liter four-necked flask equipped with stirring, thermometer, condenser, nitrogen inlet pipe and monomer feed pipe, add 250 g of deionized water, raise the temperature to 85 ° C under nitrogen filling and stirring conditions, and dissolve 2.7 g of persulfuric acid Ammonium was dissolved in 40g of deionized water to form an initiator solution and a mixed solution composed of 216g of acrylic acid, 2.16g of molecular weight regulator 3-mercaptopropionic acid and 54g of hydroxypropyl acrylate was added dropwise for 3 hours. After the dropwise addition, keep the temperature at 85°C for 1.5 hours, then cool to 50°C and add 240g of 50% sodium hydroxide solution by weight dropwise to make the pH of the reaction solution 7.10, and finally cool to 30°C to discharge, and measure the weight average. The molecular weight is 3280.

Embodiment 3

[0041] In a 1-liter four-neck flask equipped with stirring, thermometer, condenser, nitrogen inlet pipe and monomer feed pipe, add 250 g of deionized water, raise the temperature to 80 ° C under the condition of nitrogen filling and stirring, and dissolve 4.2 g of persulfuric acid Ammonium was dissolved in 40g deionized water to form an initiator solution and a mixture composed of 252g methacrylic acid, 28g sodium allyl sulfonate and 1.4g molecular weight modifier 2-mercaptopropionic acid was added dropwise at the same time, and the dropping time was 4 hours Hour. After the dropwise addition, keep the reaction at 85°C for 1 hour, then cool to 40°C and add 280g of a 50% weight concentration sodium hydroxide solution dropwise to make the pH of the reaction solution 7.82, and finally cool to 30°C to discharge, and test the weight average The molecular weight is 5910.

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PUM

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Abstract

The invention provides a dispersant used for wet grinding of heavy calcium carbonate and the preparation method thereof. The dispersant is composed of Alpha and Beta-unsaturated carboxylic acid of 80 to 100 parts by weight, and other monomers of 0 to 20 parts by weight, which are polymerized together, and a neutralizing agent in the polymer is selected from one or two of inorganic base ammonium hydroxide, sodium hydroxide, potassium hydroxide, calcium hydroxide, etc., or organic base diethylamine, triethylamine, mono ethanolamine, diethanolamine, triethanolamine, etc. The dispersant of the invention is used for grinding calcium carbonate pulp with high solid content, low viscosity and good time efficiency and stability.

Description

technical field [0001] The invention relates to a dispersant for wet grinding of heavy calcium carbonate and a preparation method thereof. Background technique [0002] Ground calcium carbonate is a widely used inorganic raw material, especially in the field of paper making, it can be used as coating or filler. When ground calcium carbonate is used as a papermaking auxiliary, wet grinding is usually required, and a dispersant is added during wet grinding. [0003] At present, alkali metal salts (sodium, lithium salts, etc.), alkaline earth metal salts, quaternary ammonium salts, etc. of polyacrylic acid are used as dispersants (for example: Japanese Patent Application Publication No. 54-82416, Japanese Patent Application No. 7-308563 Bulletins, etc.). [0004] But, the problem that these dispersing agents exist is, the initial viscosity of the inorganic pigment slurry obtained with these dispersing agents is high, and the aging stability of inorganic pigment slurry also ca...

Claims

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Application Information

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IPC IPC(8): C09C3/04C09C3/12C09C1/02C08F220/06
Inventor 施晓旦李改霞王养臣
Owner SHANGHAI DONGSHENG NEW MATERIALS
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