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Ultra-fine light calcium carbonate slurry and production method thereof

A technology of light calcium carbonate and ultrafine calcium carbonate, applied in chemical instruments and methods, fibrous fillers, inorganic pigment treatment, etc., can solve the problems of low dispersion efficiency, high adhesion of filter cake, poor viscosity stability of slurry, etc. problem, to achieve the effect of good storage stability

Active Publication Date: 2008-07-16
建德华明科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent application 200710038419.6 "A Preparation Process for Light Calcium Carbonate Slurry" proposes to use superfine calcium carbonate filter cake as raw material, to process the filter cake in one step with high shear, and to add polyphosphate as a dispersant to prepare light calcium carbonate slurry. The method of calcium carbonate slurry, but the filter cake has high adhesion, and it is easy to attach to the dispersion device when it is directly subjected to high-shear treatment, and the dispersion efficiency is low. At the same time, the high-shear slurry contains a large number of fine air bubbles, resulting in slurry The viscosity stability of the material is poor

Method used

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  • Ultra-fine light calcium carbonate slurry and production method thereof
  • Ultra-fine light calcium carbonate slurry and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0042] Get the calcium carbonate filter cake 150kg that weight solid content is 53%, particle average particle size is 0.12 μ m, this filter cake is placed in horizontal ribbon mixer, adds:

[0043] 1.59kg is the aqueous solution of the acrylic acid polymer dispersant shown in formula (A), and its mass content is 40%;

[0044] 0.159kg propylene glycol;

[0045] 2.38kgHX-5010;

[0046] and 2.88kg of water;

[0047] After premixing for 20 minutes, the slurry after the premixing is then sheared and dispersed by a pipeline type high-shear emulsification pump to obtain the viscosity described in the present invention as 154mPa.s (the test of slurry viscosity adopts NDJ-79 type rotary Viscometer test, with the rotor of 10 times, hereinafter the same) solid content is the superfine calcium carbonate water-based slurry of 52%. Said acrylic acid copolymer (A), R 1 for H, R 2 It is H, n=15, a=3, a / b=1, and the average weight average molecular weight is 20000.

Embodiment 2

[0049] Take 150 kg of calcium carbonate filter cake with a weight solid content of 70% and an average particle size of 0.81 μm. After placing the filter cake in a gravity-free twin-shaft paddle mixer, add CH-10B 3.15 kg, butanediol 2.10 kg and BYK-021 0.21kg, after premixing for 30 minutes, the premixed slurry is sheared and dispersed by a pipeline type high-shear emulsification pump, and the viscosity of the present invention is 96mPa.s and the solid content is 70%. Ultrafine calcium carbonate water-based slurry.

[0050] CH-10B is a CH series hyperdispersant product of Shanghai Sanzheng Polymer Materials Co., Ltd.

Embodiment 3

[0052]Get the calcium carbonate filter cake 150kg that solid content is 55%, particle average particle diameter is 80nm, after this filter cake horizontal ribbon mixer, add CH-18C 1.65kg, butanediol 2.06kg and AntifoamMR10500.16kg and The mixed solution of 5.67kg of water, after premixing for 15 minutes, the slurry after premixing is sheared and dispersed by a pipeline type high-shear emulsification pump, and the viscosity described in the present invention is 107mPa.s and the solid content is 53%. Nano calcium carbonate aqueous slurry. CH-18C is a CH series hyperdispersant product of Shanghai Sanzheng Polymer Materials Co., Ltd.

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Abstract

The invention provides a superfine light calcium carbonate sizing agent and a preparation method thereof. The sizing agent comprises constituents according to weight percentage: 35-70 percent of superfine calcium carbonate, 0.2-5 percent of dispersant, 0.05-0.5 percent of antifoaming agent, 0.5-5 percent of surface tension modifying agent and the rest of water. The invention uses filter cakes of the superfine calcium carbonate as raw materials and various addition agents are added into the filter cakes, a two-step high speed cutting and dispersing technique method is used after a mixed system is premixed and kneaded, and the superfine calcium carbonate water born sizing agent that has high solid content and low viscosity is obtained. Superfine calcium carbonate stable sizing agent that has high solid content and low viscosity can also be prepared based on industrialized scale. Product obtained by the invention has good storage stability and contains the superfine calcium carbonate that has relatively high solid content and low viscosity, therefore, the invention can meet the demand in relevant fields of paper coating, water born coating, water born printing ink and latex, etc.

Description

technical field [0001] The invention relates to a preparation method of light calcium carbonate slurry. Background technique [0002] In recent years, with the development of industrial technology, the application of ultrafine light calcium carbonate has been further expanded. In addition to being used in organic polymer systems such as rubber and plastics as fillers, the application in water-based media-related systems has also received more and more attention. It can be used as a coating pigment for papermaking, which can better overcome the shortcomings of GCC and traditional PCC. , which is not only beneficial to increase the speed of the paper machine, reduce the wear of the filter screen, cutter head and rubber stick of the paper machine, improve the efficiency of the paper machine, but also replace or reduce expensive titanium dioxide, silica and imported calcined kaolin At the same time, the whiteness, surface smoothness, gloss and printability of the paper are grea...

Claims

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Application Information

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IPC IPC(8): C09C1/02C09C3/00
Inventor 陈雪梅吴秋芳陈刚杨景辉马新胜李临江
Owner 建德华明科技有限公司
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