Method for preparing paper-making coating-grade deposited calcium carbonate pigment

A technology for precipitating calcium carbonate and calcium carbonate, which is applied in the direction of calcium carbonate/strontium/barium, pigmented coatings, inorganic compound addition, etc. It can solve problems such as poor flow, low thixotropic index, and agglomeration of pigment particles. Achieve the effect of solving the accumulation and agglomeration and improving the viscosity index

Inactive Publication Date: 2006-10-11
LINCHENG RUIBANG CALCIUM CARBONATE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of method that precipitated calcium carbonate (PCC) powder is carried out surface treatment, solves that when precipitated calcium carbonate is used as papermaking coating pigment, flow becomes poor, thixotropic index is low, and pigment particles agglomerate under high concentration condition. block stacking problem

Method used

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  • Method for preparing paper-making coating-grade deposited calcium carbonate pigment
  • Method for preparing paper-making coating-grade deposited calcium carbonate pigment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: prepare solid content with PCC dry powder and be 70% PCC pigment

[0015] 1. Prepare 57% slurry: Add water and sodium polyacrylate, a dispersant equivalent to 1% of the weight of calcium carbonate, to the mixing tank. After starting the high-speed disperser, measure the precipitated calcium carbonate dry powder and add it to the mixing tank in proportion. In the slurry tank, making calcium carbonate concentration is 57% PCC slurry;

[0016] 2. Preparation of 70% slurry: pump the slurry in step 1 into the 80L grinding and peeling machine in the pre-grinding process, flow into the "secondary slurry" tank after pre-grinding, and then pour it into the "secondary slurry" Add other 13% calcium carbonate dry powder and the sodium polyacrylate equivalent to 0.7% of calcium carbonate total amount in the jar, beat into the grinding and peeling machine of 300L after being scattered by a high-speed disperser (the grinding medium in the grinding and peeling machine is ...

Embodiment 2

[0017] Embodiment 2: directly prepare solid content with PCC filter cake and be 70% PCC pigment

[0018] 1. Preparation of 64% slurry: put the PCC filter cake with a water content of about 30% in the slurry mixing tank, add sodium polyacrylate equivalent to 1% of the weight of calcium carbonate, and disperse it with a high-speed disperser to make a concentration of 64% % PCC slurry;

[0019] 2. Preparation of 70% slurry: pump the slurry in step 1 into the 80L grinding and peeling machine in the pre-grinding process, flow into the "secondary slurry" tank after pre-grinding, and then pour it into the "secondary slurry" Add 6% calcium carbonate dry powder and sodium polyacrylate equivalent to 0.6% of the total amount of calcium carbonate in the tank, break it up with a high-speed disperser and put it into a 300L grinding and peeling machine, and the finished product finally obtained is the same as in Example 1.

Embodiment 3

[0020] Embodiment 3: prepare solid content with PCC dry powder and be 72% PCC pigment

[0021] 1. Prepare 59% slurry: Add water and sodium polyacrylate, a dispersant equivalent to 1.8% of the weight of calcium carbonate, to the mixing tank. After starting the high-speed disperser, measure the dry powder of precipitated calcium carbonate and add it to the mixing tank in proportion. In the slurry tank, making calcium carbonate concentration is 59% PCC slurry;

[0022] 2. Preparation of 72% slurry: Pump the slurry in step 1 into the 80L grinding and stripping machine in the pre-grinding process, and flow into the "secondary slurry" tank after pre-grinding, and then to the "secondary slurry" Add another 13% calcium carbonate dry powder and sodium polyacrylate equivalent to 1.7% of the total amount of calcium carbonate in the tank, and break it into a 300L grinding and peeling machine after being dispersed by a high-speed disperser. The final product calcium carbonate has a solid c...

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Abstract

The invention relates to a method for preparing a paper-making coating-grade precipitated calcium carbonate pigment, which is especially suitable for use as a coating pigment for high-grade coated paper, white cardboard, and light-weight (low-weight) coated paper, and belongs to the technical field of refining chemical raw materials . The present invention uses precipitated calcium carbonate dry powder as raw material, adds precipitated calcium carbonate to water in batches under high-speed dispersion conditions to adjust slurry, and obtains precipitated calcium carbonate with a solid content between 65% and 75% after multi-channel grinding. Papermaking coating grade precipitated calcium carbonate pigment with a ratio greater than 90% and a viscosity less than 300 centipoise (cps). The invention can effectively solve the agglomeration problem in the dispersion process of the precipitated calcium carbonate, improve the viscosity index of the precipitated calcium carbonate, and obtain high-concentration pigment for doctor blade coating.

Description

technical field [0001] The invention relates to a method for preparing a papermaking coating grade precipitated calcium carbonate (PCC) pigment. It is especially suitable for use as a coating pigment for high-grade coated paper, white cardboard and light-weight (low-weight) coated paper, and belongs to the technical field of refining chemical raw materials. Background technique [0002] In the field of papermaking industry, ground calcium carbonate (GCC) pigments have been widely used as primer grade and topcoat grade pigments in papermaking coating. Although precipitated calcium carbonate PCC pigments have more excellent performance than GCC pigments in terms of whiteness, particle size, hiding power, leveling property, and printability, they are significantly different from GCC in terms of physical and chemical properties. It is easy to agglomerate into agglomerates, with many gaps and interlayers, strong water absorption, and the charge polarity and surface tension on th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18C09C3/04D21H19/38D21H17/67
Inventor 赵路军
Owner LINCHENG RUIBANG CALCIUM CARBONATE
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