Dispersing agent, and preparation method and application thereof

A technology of polymer and dispersant, applied in the field of new type of dispersant for wet grinding calcium carbonate and its preparation, can solve the problems of difficult control, high viscosity, poor dispersibility, etc. The effect of cohesion

Active Publication Date: 2013-12-25
NANJING QIAOJIAN POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In reactor, add 150kg water, 20kg lignosulfonate (for reclaiming the mixture after lignin sulfonation, containing sodium salt, potassium salt, magnesium salt etc., the lignosulfonate indicated in the following specific examples is the same as this ), heated to 65°C and stirred to dissolve. Make a solution with 120kg water, 44kg methacrylic acid and 300kg acrylic acid, neutralize it with 45% caustic soda solution to a pH of about 4, then add 21kg sodium hypophosphite to make drop solution A; mix 11kg sodium persulfate, 72kg of water is made into drip 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 brown transparent liquid with 50% solid content.

Embodiment 2

[0028] Add 150kg of water into the reactor, and heat up 25kg of lignosulfonate to 65°C and stir to dissolve. 120kg of water, 50kg of itaconic acid and 340kg of acrylic acid were made into a solution, neutralized with 45% caustic soda solution to a pH of about 4, and then 22kg of sodium hypophosphite was added to make drop solution A; 11kg of sodium persulfate, 72kg of water is made into drip 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 2 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 brown transparent liquid with a solid content of 50%.

Embodiment 3

[0030] Add 150kg of water into the reactor, and heat up to 65°C to dissolve 15kg of lignosulfonate with stirring. 120kg of water, 20kg of itaconic acid, 24kg of maleic anhydride and 320kg of acrylic acid are prepared into a solution, neutralized to a pH of about 4 with 45% caustic soda solution, and then 21kg of sodium bisulfite is added to form a drop solution A; 10kg of ammonium persulfate and 72kg of 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 2 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 brown transparent liquid with a solid content of 50%.

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Abstract

The invention discloses a novel dispersing agent, and a preparation method and an application thereof. The novel dispersing agent is prepared by employing acrylic acid as a main reaction monomer, adding one or more monomers such as methacrylic acid, maleic anhydride, fumaric acid, itaconic acid and sodium methyl allyl sulfonate as comonomers; allowing lignosulfonate recycled from papermaking wastewater to participate in polymerization; taking a redox system as an initiation system; performing water solution polymerization; and neutralizing with alkaline substance. The novel dispersing agent allows the grinding of calcium carbonate to have the characteristics of low pulp viscosity, small grain size, good dispersibility and high stability.

Description

technical field [0001] The invention relates to a novel polymer dispersant, in particular to a novel dispersant for wet grinding calcium carbonate and its preparation method and application. Background technique [0002] Papermaking black liquor is the wastewater produced by the alkaline (caustic soda method and sulfate method) pulping process of the papermaking industry. It contains a large amount of lignin and is dark brown. Black liquor contains a large amount of suspended solids, organic pollutants and toxic substances, and direct discharge into water bodies will cause serious pollution. Its main hazards are: papermaking wastewater containing a large amount of fibers, pigments and inorganic salts will turn the water black and have a special stench; the biochemical oxygen demand (BOD) of papermaking black liquor containing high concentrations of organic pollutants can be as high as 5000-40000g / L, will consume a large amount of dissolved oxygen in water and affect water q...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F289/00C08F220/06C08F222/06C08F222/02C08F228/02C08F4/40C08H7/00B01F17/52C09C1/02C09C3/04C09C3/10D21H19/58C09K23/52
Inventor 雷得定谢鹏王然
Owner NANJING QIAOJIAN POLYMER MATERIAL CO LTD
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