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

Method used

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  • Novel dispersant, preparation method thereof and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] Add 190 kg of water and 20 kg of maleic anhydride to the reaction kettle, and stir to dissolve at 65°C. Mix 150kg of water, 34kg of methacrylic acid, and 337kg of acrylic acid into a solution, neutralize it with 45% caustic soda solution to a pH of about 4, then add 12kg of r-methacryloxypropyltrimethoxysilane and 21kg of sub Sodium phosphate is made into dripping solution A; 11kg of sodium persulfate and 72kg of water are made into dripping solution B. The temperature of the reactor was increased to 80°C, and A and B were added dropwise. The dropwise addition was completed in 2.5h, and then reacted for 3h, cooled to below 50°C, measured the pH value, adjusted the pH value to 4 with 45% caustic soda solution, and discharged 50% solid content yellow transparent liquid.

Example Embodiment

[0026] Example 2

[0027] Add 190kg of water and 4kg of maleic anhydride to the reaction kettle, raise the temperature to 65°C and stir to dissolve. Mix 150kg water, 50kg itaconic acid and 320kg acrylic acid into a solution, neutralize it with 45% caustic soda solution to a pH of about 4, then add 12kg r-methacryloxypropyltrimethoxysilane and 20kg sub Sodium phosphate is made into dripping solution A; 12kg of sodium persulfate and 72kg of water are made into dripping solution B. The temperature of the reactor was increased to 80°C, and A and B were added dropwise. After 4h dripping is completed, react for another 1h, cool 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 a solid content of 49%.

Example Embodiment

[0028] Example 3

[0029] Add 180 kg of water and 15 kg of fumaric acid to the reaction kettle and raise the temperature to 65° C. and stir to dissolve. Mix 160kg water, 20kg sodium methacrylic acid sulfonate, 24kg itaconic acid and 340kg acrylic acid into a solution, neutralize it with 45% caustic soda solution to a pH of about 4, and then add 13kg r-methacryloxypropyl Trimethoxysilane and 20kg sodium bisulfite were mixed into dripping liquid A; 10kg ammonium persulfate and 72kg water were mixed into dripping liquid B. The temperature of the reactor was increased to 75°C, and A and B were added dropwise. After 4h dripping is completed, react for another 1h, cool to below 50℃, measure the pH value, adjust the pH value to 4 with 45% caustic soda solution, 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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