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Preparation method of ultrawhite, easily dispersible and high stability powder special for water-based paint

A water-based coating, easy-to-disperse technology, applied in chemical instruments and methods, fibrous fillers, inorganic pigment treatment, etc., can solve the problems of high processing cost, coarse powder particle size, high labor intensity, etc. The effect of fine particle size and high process efficiency

Inactive Publication Date: 2013-09-11
HENAN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Commonly used non-metallic ores that can be used as coating fillers include kaolinite (soil), calcite, dolomite, wollastonite, talc, etc., which are made of white powder by crushing, manual sorting, and crushing. The process has existed for a long time High labor intensity, low efficiency, low whiteness of finished powder and other defects, and the current surface of coating filler powder is not coated, the powder particle size is coarse, low whiteness, difficult to disperse, poor weather resistance, high processing cost, etc. Defects, powder can only replace titanium dioxide in a small amount in coatings, especially exterior wall coatings

Method used

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  • Preparation method of ultrawhite, easily dispersible and high stability powder special for water-based paint

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Effect test

Embodiment 1

[0034] A method for preparing a special powder for ultra-white, easy-to-disperse and highly stable water-based coatings, the steps of which are as follows:

[0035] ① Add CaCO3 Content ≥ 90%, Fe 2 o 3 1050kg of light-colored calcite blocks with a content of 1.50% are crushed into pellets with a particle size of <6mm by a crusher;

[0036] ②Sieve the granular material with a screening machine with apertures of 2×2mm and 6×6mm double-layer screens to obtain 1000kg of granular material with a particle size distribution of 2mm-6mm, and return the granular material >6mm to the crushing system to continue crushing. Pellets <2mm are crushed and used to make ordinary powder;

[0037] ③ Use a color difference sorting machine with digital camera, digital signal processing, high-pressure airflow, air gun, separation slide, and material collection device to electromechanically sort and separate calcite particles with variegated particles, and control the whiteness of the finished produc...

Embodiment 2

[0041] A method for preparing a special powder for ultra-white, easy-to-disperse and highly stable water-based coatings, the steps of which are as follows:

[0042] ① Add CaMg (CO 3 ) 2 Content ≥ 90%, Fe 2 o 3 1040kg of light-colored dolomite blocks with a content of 0.60% are crushed into pellets with a particle size of <5mm;

[0043] ②Sieve the granular material with a screening machine with apertures of 1×1mm and 5×5mm double-layer screens to obtain 1000kg of granular material with a particle size distribution of 1mm-5mm, and return the granular material >5mm to the crushing system to continue crushing. Pellets <1mm are crushed and used to make ordinary powder;

[0044] ③A color difference sorting machine with digital camera, digital signal processing, high-pressure airflow, air gun, separation slide, and material collection device is used to electromechanically sort and separate dolomite particles with variegated particles. Degree 96% requirement, select Fe 2 o 3 Co...

Embodiment 3

[0048] A method for preparing an ultra-white, easily dispersed and highly stable water-based paint special powder, the steps of which are as follows:

[0049] ①CaSiO 3 Content ≥ 90%, Fe 2 o 3 1035kg of light-colored wollastonite blocks with a content of 0.40% are crushed into pellets with a particle size of <5mm;

[0050] ②Sieve the granular material with a screening machine with apertures of 1×1mm and 5×5mm double-layer screens to obtain 1000kg of granular material with a particle size distribution of 1mm-5mm, and return the granular material >5mm to the crushing system to continue crushing. Pellets <1mm are crushed and used to make ordinary powder;

[0051] ③ Use a color difference sorting machine with digital camera, digital signal processing, high-pressure airflow, air gun, separation slide, and material collection device to electromechanically sort and separate wollastonite particles with variegated particles, and control the finished product according to the plan Whi...

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Abstract

The invention discloses a preparation method of an ultrawhite, easily dispersible and high stability powder special for water-based paint. The method includes the following steps of: (1) breaking: making naturally produced lump ores with a light color into granules with a size smaller than 6mm; (2) screening: screening the granules in step (1) into granules with a size of 1mm-6mm by a screening machine equipped with two-layer screens; (3) color difference sorting; (4) crushing and coating: mixing a dispersing and coating aid with a mass part accounting for 0.3%-1.0% of that of the granules with ultrawhite granules, and simultaneously conducting ultrafine crushing and coating treatment, thus obtaining the ultrawhite, easily dispersible and high stability powder that is special for water-based paint and has whiteness of 96%-98%, a powder particle size d97 of 2 micrometers to 8 micrometers and an Fe2O3 content of 0.06%-0.12%; and (5) carrying out inspection and packaging. The invention, By means of grain size control, electromechanical color sorting, and crushing / modification ''one-step'' treatment, the whole process involved in the invention has the advantages of high efficiency, short procedure, reasonable heat utilization, high yield of fine powder, even surface coating, and lower dissolution performance, etc. Compared with uncoated powder with the same grain size, the prepared powder can substantially replace titanium dioxide in application in paint.

Description

technical field [0001] The invention belongs to the field of non-metallic ore powder preparation, and in particular relates to a method for preparing a special powder for coatings which is treated with light-colored ore through particle size control, electromechanical color separation, crushing / modification "one-step method". This method is suitable for use Calcite (also known as heavy calcium carbonate), dolomite, wollastonite, kaolinite (soil), talc and natural light-colored ores formed by the symbiosis of calcium magnesium aluminum carbonate and silicate minerals are processed into ultra-white, Mineral-modified powder for water-based coatings that is easy to disperse and has high stability. Background technique [0002] Titanium dioxide is a filler powder with good performance and large dosage for coatings, especially water-based coatings for exterior walls. Its main advantages as a coating filler powder are reflected in the following two aspects: First, the powder partic...

Claims

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Application Information

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IPC IPC(8): C09C1/42C09C1/40C09C3/04C09C3/10C09C3/06
Inventor 孙亚光余丽秀陈全国
Owner HENAN UNIVERSITY OF TECHNOLOGY
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