Dispersing agent and its preparation method and application

A technology of dispersant and molecular weight regulator, applied in the direction of adding inorganic compounds, can solve the problems of low solid content, high viscosity, large particles, etc., and achieve the effect of good slurry stability, high solid content and good dispersibility

Active Publication Date: 2009-12-09
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the calcium carbonate slurry prepared by conventional equipment has low solid content, large particles, poor dispersion, poor slurry stability, and high viscosity, which cannot meet the needs of the papermaking field, so the existing technology must be improved. The role of dispersants, such as dispersants, cannot be underestimated. The performance of dispersants will directly affect the stability and viscosity of the slurry. Therefore, it is of great significance to develop and research new dispersants for grinding calcium carbonate slurry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of dispersant:

[0028] Reaction solution A:

[0029] Acrylic: 138 grams

[0030] Dimethyldiallyl ammonium chloride: 62 grams

[0031] Mercaptoacrylic acid: 2 grams

[0032] Above-mentioned three kinds of substances are mixed to make mixed liquid A

[0033] Reaction solution B:

[0034] Initiator ammonium persulfate: 1.4 grams

[0035] Deionized water: 26.6 grams

[0036] Mix to obtain solution B;

[0037] In a four-neck flask with a condenser, a thermometer, a nitrogen channel and a dropping pipe, add 280 grams of water and 0.6 grams of initiator, under the protection of nitrogen, stir and heat, when the temperature rises to 60 ° C, slowly drop the reaction Liquid A and reaction liquid B, control the reaction liquid A and reaction liquid B dropwise at the same time, after the dropwise addition, the temperature is raised to 90 ° C, and kept at this temperature for 3 hours, then cooled to 40 ° C, with a weight concentration of 5 % sodium hydroxide sol...

Embodiment 2

[0043] Dispersant preparation:

[0044] Reaction solution A:

[0045] Acrylic: 138 grams

[0046] Dimethyldiallyl ammonium chloride: 310 grams

[0047] Mercaptoacrylic acid: 4.48 grams

[0048] Above-mentioned three kinds of substances are mixed to make mixed liquid A

[0049] Reaction solution B:

[0050] Initiator ammonium persulfate: 5.4 grams

[0051] Deionized water: 102.6 grams

[0052] Mix to make solution B

[0053] Add 467 grams of water and 2.6 grams of initiator in a four-necked flask with a condenser, a thermometer, a nitrogen channel, and a dropping pipe. Under nitrogen protection, stir and heat. When the temperature rises to 80°C, slowly add the reaction solution dropwise. Solution A and reaction solution B, control the reaction solution A and reaction solution B to be added dropwise at the same time, after the dropwise addition is completed, the temperature is raised to 100 ° C, and kept at this temperature for 1 hour, then cooled to 40 ° C, with a weight...

Embodiment 3

[0058] Preparation of dispersant:

[0059] Reaction solution A:

[0060] Acrylic: 138 grams

[0061] Dimethyldiallyl ammonium chloride: 150 grams

[0062] Mercaptoacrylic acid: 2.88 grams

[0063] Above-mentioned three kinds of substances are mixed to make mixed liquid A

[0064] Reaction solution B:

[0065] Initiator ammonium persulfate: 2.88 grams

[0066] Deionized water: 54.72 grams

[0067] Make a 5% solution B

[0068]Add 353 grams of water and 1.44 grams of initiator to a four-necked flask with a condenser, a thermometer, a nitrogen channel, and a dropping pipe. Under nitrogen protection, stir and heat. When the temperature rises to 60°C, slowly add the reaction solution dropwise. Liquid A and reaction liquid B, control the reaction liquid A and reaction liquid B to be added dropwise at the same time, after the dropwise addition is completed, the temperature is raised to 90 ° C, and kept at this temperature for 3 hours, then cooled to 40 ° C, with a weight conce...

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PUM

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Abstract

The invention discloses a dispersant and its preparation method and application. The preparation method comprises the following steps: (1) mixing 280-467 parts by weight of water and 0.6-2.6 parts by weight of an initiator; (2) mixing 138 parts by weight of (Meth)acrylic acid, 62-310 parts by weight cationic monomer and the molecular weight regulator of 1-3 parts by weight are mixed to make reaction solution A; (3) use the initiator of 1-6 parts by weight and 26-105 parts by weight water to make reaction solution B; (4) add reaction solution A and B dropwise at the same time, and the dropping time is 3-5 hours; (5) after the dropwise addition is completed, heat up to 90-100°C, and react 1-3 Hours, then lower the temperature to 40-50°C, neutralize the pH value to 7-9 with alkaline substances. The calcium carbonate slurry prepared by using the dispersant of the invention has high solid content, small particle size, good dispersibility, good slurry stability and low viscosity.

Description

technical field [0001] The invention relates to a dispersant for preparing calcium carbonate slurry with high solid content and a preparation method thereof. Background technique [0002] Papermaking filler dispersant is a fine chemical product, it can make the calcium carbonate, kaolinite, talcum powder and other fillers used in the papermaking process evenly distributed on the surface of the paper, reduce the cost of paper, increase the performance of paper, and improve the quality of paper. Formation, increase paper opacity and whiteness, increase printability and dimensional stability. Dispersants include sodium pyrophosphate, sodium hexametaphosphate and sodium polyacrylate. The currently used dispersant is mainly sodium polyacrylate, which has a good dispersion effect on kaolin, but the grinding and dispersion effect on calcium carbonate is not ideal. [0003] As a white pigment, calcium carbonate has a whiteness greater than 92% and a density of 2.7g / cm 3 , the refr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H17/67
Inventor 施晓旦李改霞
Owner SHANGHAI DONGSHENG NEW MATERIALS
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