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Novel dispersant, preparation method thereof and application thereof

A dispersant, a new type of technology, applied in the field of new dispersant for wet grinding calcium carbonate and its preparation, can solve the problems of difficult control, high viscosity, low solid content, etc., to achieve improved effect, low slurry viscosity, and dispersibility Good results

Inactive Publication Date: 2011-07-06
山东永港伟方环保材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the calcium carbonate slurry prepared by the existing dispersant has low solid content, large particles, poor dispersibility, poor slurry stability and high viscosity, which cannot meet the needs of the papermaking field, and the preparation method of the dispersant has many steps. The material is complex and difficult to control, so it is of great significance to improve it, so that the calcium carbonate grinding has the characteristics of low slurry viscosity, small particle size, good dispersion and relatively stable

Method used

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  • Novel dispersant, preparation method thereof and application thereof

Examples

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Effect test

Embodiment 1

[0025] Add 190kg of water and 20kg of maleic anhydride into the reactor, heat up to 65°C and stir to dissolve. Make a solution of 150kg water, 34kg methacrylic acid and 337kg acrylic acid, neutralize it with 45% caustic soda solution to a pH of about 4, then add 12kg r-methacryloxypropyltrimethoxysilane, 21kg Sodium phosphate is made into drop solution A; 11kg sodium persulfate and 72kg water are made into drop solution B. Raise the temperature of the reactor to 80°C and start adding A and B dropwise at the same time. After 2.5 hours of dropwise addition, react for another 3 hours, lower the temperature to below 50°C, measure the pH value, adjust the pH value to 4 with 45% caustic soda solution, and discharge to obtain a yellow transparent liquid with a solid content of 50%.

Embodiment 2

[0027] Add 190kg of water and 4kg of maleic anhydride to the reaction kettle and raise the temperature to 65°C and stir to dissolve. Make a solution of 150kg water, 50kg itaconic acid, and 320kg acrylic acid, neutralize it with 45% caustic soda solution until the pH is about 4, then add 12kg r-methacryloxypropyltrimethoxysilane, 20kg trimethoxysilane Sodium phosphate is made into drop solution A; 12kg sodium persulfate and 72kg water are made into drop solution B. Raise the temperature of the reactor to 80°C and start adding A and B dropwise at the same time. After 4 hours of dropwise addition, react for another 1 hour, lower the temperature to below 50°C, measure the pH value, adjust the pH value to 4 with 45% caustic soda solution, and discharge to obtain a light yellow transparent liquid with 49% solid content.

Embodiment 3

[0029] Add 180kg of water and 15kg of fumaric acid into the reaction kettle and raise the temperature to 65°C and stir to dissolve. Make a solution with 160kg of water, 20kg of sodium methacrylate, 24kg of itaconic acid, and 340kg of acrylic acid, neutralize it with 45% caustic soda to a pH of about 4, and then add 13kg of r-methacryloyloxypropyl Trimethoxysilane, 20kg sodium bisulfite is made into drop solution A; 10kg ammonium persulfate and 72kg water are made into drop solution B. Raise the temperature of the reactor to 75°C and start adding A and B dropwise at the same time. After 4 hours of dropwise addition, react for another 1 hour, lower the temperature to below 50°C, measure the pH value, adjust the pH value to 4 with 45% caustic soda solution, and discharge to obtain a light yellow transparent liquid with 50% solid content.

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Abstract

The invention discloses a preparation method of a novel dispersant, which comprises the steps of: taking crylic acid as a main reaction monomer; adding at least one of monomers such as methacrylic acid, maleic anhydride, fumaric acid, itaconic acid and methyl sodium allylsulfonate as comonomer; taking r-methacryloxypropyl trimethoxy silane, vinyl trimethoxy silane or vinyl triethoxysilane as organic silicon monomer to participate in polymerization; taking a redox system as an initiating system; and polymerizing by water solution, and neutralizing by alkaline substance to obtain the novel dispersant. Due to the novel dispersant, the grinding of calcium carbonate has the characteristics of being low in sizing agent viscosity, small in grain size, good in dispersibility and high in stability.

Description

technical field [0001] The invention relates to a novel dispersant, in particular to a novel dispersant for wet grinding calcium carbonate and its preparation method and application. Background technique [0002] Calcium carbonate exists in many forms in nature, and calcite is the most useful for paper coatings. However, natural calcite must be mechanically crushed, ground, and classified to make fine particles (we call it ground calcium carbonate or ground calcium carbonate, GCC) before it can be used in the preparation of paper coatings. [0003] The dispersant is adsorbed on the surface of the pigment particles to generate electrostatic repulsion and steric hindrance, so that the particles can exist stably in a suspended state. With the help of dispersants in calcium carbonate grinding, calcium carbonate slurry with high solid content and low viscosity can be obtained, the grinding efficiency can also be improved, and the energy required for grinding can be saved. There ...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F222/06C08F222/02C08F228/02C08F230/08C08F4/40B01F17/52C09C3/04C09C3/10C09C1/02C09K23/52
Inventor 雷得定王然孙睢州
Owner 山东永港伟方环保材料科技有限公司
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