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A kind of preparation method of high stability nano-calcium carbonate aqueous phase dispersion liquid for papermaking coating

A nano-calcium carbonate, high-stability technology, applied in the direction of pigment-containing coatings, etc., to achieve the effect of improving dispersibility, easy operation and remarkable results

Active Publication Date: 2016-09-21
江苏华衡工程材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, in the process of preparing paper coatings, the aqueous phase dispersion method of nano-calcium carbonate particles is studied in detail, and the research on the preparation of high-stability nano-calcium carbonate aqueous phase dispersion liquid based on the joint mechanism of electrostatic interaction, steric hindrance effect and ultrasonic action, domestic Not yet reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] (1) Based on the electrostatic force formed by sodium hexametaphosphate, the dispersion stability of nano-calcium carbonate in water phase is improved: first, 0.4% (to absolute dry nano-calcium carbonate) sodium hexametaphosphate is dissolved in water, and then at 3300r / min Add nano-calcium carbonate to the sodium hexametaphosphate dispersion at a shear rate, adjust the pH of the system to 8.2, and the solid content to 30%, and continue to disperse for 18 minutes. (2) Based on the steric hindrance effect formed by sodium carboxymethyl cellulose, the dispersion stability of nano-calcium carbonate in aqueous phase is improved: at a shear rate of 4800r / min, 0.6% (for absolute dry nano-calcium carbonate) of carboxymethyl Sodium cellulose was added to the nano-calcium carbonate dispersion obtained in step (1), the pH of the system was adjusted to 9.0, and the dispersion was continued for 12 minutes. (3) Improving the dispersion stability of nano-calcium carbonate in aqueous ...

Embodiment 2

[0015] (1) Based on the electrostatic force formed by sodium hexametaphosphate, the dispersion stability of nano-calcium carbonate in water phase is improved: first, 0.6% (to absolute dry nano-calcium carbonate) sodium hexametaphosphate is dissolved in water, and then at 3400r / min Add nano-calcium carbonate to the sodium hexametaphosphate dispersion at a shear rate, adjust the pH of the system to 8.3, and the solid content to 30%, and continue to disperse for 19 minutes. (2) Based on the steric hindrance effect formed by sodium carboxymethyl cellulose to improve the dispersion stability of nano-calcium carbonate in aqueous phase: at a shear rate of 4900r / min, add 0.8% (to absolute dry nano-calcium carbonate) of carboxymethyl Sodium methylcellulose was added to the nano-calcium carbonate dispersion obtained in step (1), the pH of the system was adjusted to 9.1, and the dispersion was continued for 14 minutes. (3) Improve the dispersion stability of nano-calcium carbonate in aqu...

Embodiment 3

[0017] (1) Based on the electrostatic force formed by sodium hexametaphosphate, the dispersion stability of nano-calcium carbonate in water phase is improved: first, 0.8% (to absolute dry nano-calcium carbonate) sodium hexametaphosphate is dissolved in water, and then at 3500r / min Add nano-calcium carbonate to the sodium hexametaphosphate dispersion at a shear rate, adjust the pH of the system to 8.4, and the solid content to 30%, and continue to disperse for 20 minutes. (2) Based on the steric hindrance effect formed by sodium carboxymethyl cellulose to improve the dispersion stability of nano-calcium carbonate in aqueous phase: at a shear rate of 5000r / min, add 1.0% (to absolute dry nano-calcium carbonate) carboxymethyl Sodium methylcellulose was added to the nano-calcium carbonate dispersion obtained in step (1), the pH of the system was adjusted to 9.2, and the dispersion was continued for 15 minutes. (3) Improving the dispersion stability of nano-calcium carbonate aqueous...

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Abstract

The invention discloses a preparation method for a high-stability nano-calcium carbonate aqueous-phase dispersion liquid for a papermaking coating. The preparation method comprises the following steps: (1) improving the aqueous-phase dispersion stability of nano-calcium carbonate on the basis of a static acting force formed by sodium hexametaphosphate; (2) improving the aqueous-phase dispersion stability of nano-calcium carbonate on the basis of a steric hindrance effect formed by sodium carboxymethylcellulose; and (3) improving the aqueous-phase dispersion stability of nano-calcium carbonate on the basis of an ultrasonic action. The innovation points of the preparation method disclosed by the invention lie in that the high-stability nano-calcium carbonate aqueous-phase dispersion liquid is prepared on the basis of the combined mechanism of the static action, the steric hindrance effect and the ultrasonic action; the various steps are elaborately designed, thus realizing a synergistic effect and avoiding simple process superposition. The preparation method disclosed by the invention has the following advantages that (1) water is used as a dispersion medium in the overall technology, the concept of green design is followed, and the development trend of an environment-friendly papermaking coating is met; (2) the production process is simple, easy to operate, and remarkable in effect; (3) the production process is safe, non-toxic and pollution-free.

Description

technical field [0001] The invention belongs to the field of functional pigments for papermaking coatings, and in particular relates to a preparation method of a high-stable nanometer calcium carbonate aqueous phase dispersion liquid for papermaking coatings. Background technique [0002] In recent years, with the influx of foreign high-end coating products into the Chinese market, my country's coating processing industry has been severely impacted. Through the detection of some imported high-end coating products, it was found that different kinds of nanomaterials were added to some products. In the high-grade coating system, nano-materials endow coated paper with good printing performance and anti-aging performance with its unique physical and chemical properties and small size effect, quantum size effect and surface effect that conventional materials do not have. [0003] Nanomaterials are a hotspot in material science research at present, and the correspondingly develope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H19/38
Inventor 唐艳军
Owner 江苏华衡工程材料有限公司