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Dispersant for grinding superfine heavy calcium carbonate and preparation method thereof

A heavy calcium carbonate, dispersant technology, applied in chemical instruments and methods, dyed polymer organic compound treatment, fibrous fillers, etc. big problem

Active Publication Date: 2011-12-21
SHANGHAI DONGSHENG NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But in actual work at present, the problem that these dispersing agents exist is: (1) often use high solid content about 70% mud cake, mud, paste when heavy calcium carbonate coated paper, this makes fixed layer ratio and The viscosity shear is large, which increases the pressure of the scraper during the coating process and increases the loss of the machine; (2) to optimize the performance of the scraper on the coating machine, the solid content must be reduced, which means that a large amount of scrap must be removed. Water consumes more drying energy, so it is necessary to develop a new type of high-efficiency dispersant for grinding ultra-fine calcium carbonate

Method used

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  • Dispersant for grinding superfine heavy calcium carbonate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 0.1 g of sodium persulfate into 20 g of deionized water, stir and dissolve to obtain solution A;

[0028] Add 0.1 g of sodium bisulfite to 20 g of deionized water, stir and dissolve to obtain solution B;

[0029] Mix 70 grams of acrylic acid and 10 grams of styrene to obtain mixed monomer C;

[0030] Add 110 grams of deionized water, 0.02 grams of ferrous sulfate, 10 grams of maleic anhydride and 10 grams of sodium allyl sulfonate in a 500ml four-necked flask equipped with stirring, thermometer, ventilation pipe and feed pipe, and start stirring And dissolve under heating conditions, when the temperature of the system rises to 95°C and the dissolution is complete, add solution A, solution B and mixed monomer C dropwise at the same time, and the dropping time is 4 hours;

[0031] After the dropwise addition, react at 95°C for 2 hours, lower the temperature to 40°C, adjust the pH value of the system to 7.0 with a 40% weight concentration of sodium hydroxide solution,...

Embodiment 2

[0033] Add 1.5 grams of ammonium persulfate into 20 grams of deionized water, stir and dissolve to obtain solution A;

[0034] Add 7.5 grams of sodium bisulfite to 20 grams of deionized water, stir and dissolve to obtain solution B;

[0035] 90 grams of acrylic acid and 5 grams of styrene are mixed uniformly to obtain mixed monomer C;

[0036] Add 85 grams of deionized water, 0.15 grams of ferrous sulfate and 5 grams of sodium methallyl sulfonate in a 500ml four-neck flask equipped with stirring, thermometer, vent pipe and feed pipe, start stirring and When the temperature of the system rises to 80°C and the dissolution is complete, add solution A, solution B and mixed monomer C dropwise at the same time, and the dropping time is 4 hours;

[0037] After the dropwise addition, react for 2 hours at 80°C, then cool down to 40°C, adjust the pH value of the system to 7.5 with a 40% weight concentration of sodium hydroxide solution, and finally cool to 30°C to discharge the materia...

Embodiment 3

[0039] Add 1.0 g of potassium persulfate to 20 g of deionized water, stir and dissolve to obtain solution A;

[0040] Add 1.5 grams of sodium bisulfite to 20 grams of deionized water, stir and dissolve to obtain solution B;

[0041] Mix 80 grams of acrylic acid and 10 grams of styrene to obtain mixed monomer C;

[0042] Add 110 gram of deionized water, 0.1 gram of ferrous sulfate, 5 gram of itaconic acid and 5 gram of sodium methallyl sulfonate in the 500ml four-neck flask that stirring, thermometer, ventilation pipeline and feeding pipeline are housed, Start stirring and dissolve under heating conditions. When the temperature of the system rises to 90°C and the dissolution is complete, add solution A, solution B and mixed monomer C dropwise at the same time, and the dropping time is 4 hours;

[0043] After the dropwise addition, react for 1 hour at 95°C, then cool down to 40°C, adjust the pH value of the system to 8.0 with a 40% weight concentration of sodium hydroxide solut...

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Abstract

The invention discloses a dispersant for grinding superfine heavy calcium carbonate and a preparation method thereof. The preparation method comprises the following steps: simultaneously adding persulfate aqueous solution A, sodium bisulfite aqueous solution B and mixed monomer C containing unsaturated The aqueous solution of dibasic carboxylic acid, unsaturated sulfonate and ferrous sulfate is reacted at 80-95°C for 1-2 hours, and sodium hydroxide solution is added until the pH value of the system reaches 7-8 to obtain the dispersant. The synthesis process of the invention is simple and the production period is short. It is used for grinding superfine ground calcium carbonate with high solid content, and has the advantages of small particle size, narrow particle size distribution, less impurities and high whiteness. It is suitable for industries such as papermaking, coatings, plastics, and sealants.

Description

technical field [0001] The invention relates to a dispersant for grinding superfine heavy calcium carbonate and a preparation method thereof. Background technique [0002] Ultrafine ground calcium carbonate is widely used in papermaking, plastics, rubber, coatings and other fields due to its high whiteness and high opacity. In the grinding process of ultrafine ground calcium carbonate, adding dispersant is an important method to improve the grinding efficiency, increase the solid content of the slurry, and reduce the particle fineness. [0003] At present, polyacrylic acid salts (sodium, lithium salts, etc.), alkaline earth metal salts, quaternary ammonium salts, etc. are used as dispersants (for example: Japanese Patent Application No. 54-82416, Japanese Patent Application No. 7-308563). Wait). [0004] But in actual work at present, the problem that these dispersing agents exist is: (1) often use high solid content about 70% mud cake, mud, paste when heavy calcium carbon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F222/02C08F212/08C08F228/02B01F17/52C09C3/04C09C3/10C09C1/02C09K23/52
Inventor 施晓旦李改霞王养臣
Owner SHANGHAI DONGSHENG NEW MATERIALS