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CN-121991533-A - Novel white pigment porcelain powder and preparation process thereof

CN121991533ACN 121991533 ACN121991533 ACN 121991533ACN-121991533-A

Abstract

The invention discloses novel white pigment porcelain powder, which comprises, by weight, 11-12 parts of kaolin powder, 6-8 parts of silica powder, 30 parts of meta-titanic acid, 1 part of nano alumina and 0.4-0.5 part of an aminosilane coupling agent as raw materials for manufacturing the novel white pigment porcelain powder. According to the invention, kaolin powder and silicon dioxide powder are used as main raw materials, and meta-titanic acid is used as an auxiliary material, so that the use of full amount of titanium dioxide can be avoided, the advantages of high whiteness and low price of natural mineral resources can be fully utilized, the raw material expenditure is greatly reduced, meanwhile, the highest calcination temperature is controlled at 950 ℃, the temperature is lower than that of the traditional high temperature process of 1000 ℃ of titanium dioxide, and the energy consumption is obviously reduced and the equipment loss is reduced by matching with a sectional temperature control strategy.

Inventors

  • CHEN AIJUN
  • CHEN HONGYU
  • CHEN SUMIN
  • CHEN PENG

Assignees

  • 安徽中江材料科技有限公司

Dates

Publication Date
20260508
Application Date
20251230

Claims (9)

  1. 1. The novel white pigment porcelain powder is characterized in that the novel white pigment porcelain powder manufacturing raw materials comprise 11-12 parts of kaolin powder, 6-8 parts of silicon dioxide powder, 30 parts of metatitanic acid, 1 part of nano alumina and 0.4-0.5 part of an aminosilane coupling agent.
  2. 2. The preparation process of the novel white pigment porcelain powder is suitable for the novel white pigment porcelain powder as claimed in claim 1, and is characterized by comprising the following steps of: Firstly, raw material pretreatment, namely selecting kaolin powder, silicon dioxide powder, metatitanic acid, nano alumina and an aminosilane coupling agent according to the corresponding parts by weight, wherein the whiteness of the kaolin powder is 95, the diameter is less than or equal to 5um, the whiteness of the silicon dioxide is more than or equal to 98, the diameter is less than or equal to 5um, the purity of the metatitanic acid is more than or equal to 98%, the metatitanic acid is screened by a 200-mesh screen, the granularity of the nano alumina is less than or equal to 200nm, and the purity is more than or equal to 99.5%; Adding pure water with the same mass parts as the manufacturing raw materials after the pretreatment according to the principle of the step one, uniformly mixing the pure water with the manufacturing raw materials, and then filling the mixture into a ball mill, wherein the linear speed of the ball mill is 200m/min, the grinding time is 5-6h, and the middle line of powder particles is slurry with the size of 1.2-1.5 mu m; Step three, dehydration, namely dehydrating the slurry in the step two by adopting a high-speed centrifugal machine to ensure that the water content of the slurry is less than or equal to 8 percent; Step four, drying, calcining and modifying, namely delivering the dehydrated slurry into a kiln for calcining treatment, and carrying out three-stage calcining treatment and modification by using the kiln; crushing, grinding and grading, namely crushing the large-particle material formed after calcination, then conveying the large-particle material into a Raymond mill for grinding, and carrying out air flow grading to obtain uniform powder; and step six, surface treatment, namely selecting a surface treatment mode according to the application of the product to obtain a porcelain powder finished product.
  3. 3. The preparation process of the novel white pigment porcelain powder according to claim 1, wherein in the second step, a grinding medium in the ball mill is zirconium beads, the diameter of the zirconium beads is 0.8-1.2mm, an electric heating plate is arranged outside the ball mill, and the temperature of slurry in the grinding process of the ball mill is 25-35 ℃.
  4. 4. The preparation process of the novel white pigment porcelain powder is characterized in that in the fourth step, a kiln is subjected to three-stage calcination treatment modification, the kiln is heated from normal temperature to 400 ℃ in the first stage calcination treatment, the temperature in the kiln is kept for 60min after reaching 400 ℃, the temperature in the kiln is heated from 400 ℃ to 950 ℃ in the second stage kiln, the heating time is 20min, the kiln temperature is kept for 120min after reaching 950 ℃, and the material is sent into a cooling box in the third stage to be rapidly cooled to 50 ℃.
  5. 5. The preparation process of the novel white pigment porcelain powder is characterized in that the kiln is an electric heating tunnel kiln, the temperature rising speed of the first stage in the electric heating tunnel kiln is 5-6 ℃ per minute, cold air forced convection cooling is adopted in the third stage, the cooling air speed is 3-5m per minute, and the temperature of materials is reduced to be within 50 ℃ within 30 minutes.
  6. 6. The process for preparing the novel white pigment porcelain powder according to claim 5, wherein the sixth surface treatment mode comprises the steps of preparing hydrophilic porcelain powder and preparing hydrophobic porcelain powder, wherein surface treatment is carried out when the hydrophobic product is prepared, 2% of organic silicon and 1% of surfactant are added into the fifth uniform powder according to the mass percent during the surface treatment, the organic silicon and the surfactant are added in the form of solution or emulsion, and the porcelain powder finished product is obtained after stirring and mixing, and the surface treatment is not needed when the hydrophilic product is prepared.
  7. 7. The preparation process of the novel white pigment porcelain powder according to claim 6, wherein the surfactant is polyoxyethylene polyoxypropylene ether segmented copolymer, the organosilicon is methyltrimethoxysilane, and the stirring speed is 600-800r/min and the stirring time is 30-40min when the mixture is stirred.
  8. 8. The process for preparing the novel white pigment porcelain powder according to claim 7, wherein the kaolin powder and the silicon dioxide powder are subjected to pre-dispersion treatment before the raw materials are mixed in the step two, the pre-dispersion treatment is carried out by adopting an ultrasonic device, the ultrasonic power of the ultrasonic device is 300-500W, and the ultrasonic pre-dispersion time of the ultrasonic device is 20-30min.
  9. 9. The process for preparing the novel white pigment porcelain powder according to claim 8, wherein the porcelain powder finished product is packaged by a vacuum packaging machine, and the packaging bag is a PE moisture-proof film packaging bag.

Description

Novel white pigment porcelain powder and preparation process thereof Technical Field The invention relates to the technical field of ceramic powder processing, in particular to novel white pigment ceramic powder and a preparation process thereof. Background White pigment is a core raw material in the industries of paint, plastics, papermaking and the like, wherein titanium dioxide occupies the mainstream market for a long time due to excellent hiding power and whiteness. However, the traditional titanium dioxide preparation process has the remarkable defects that on one hand, the sulfuric acid method or the chlorination method needs high temperature (more than 1000 ℃) in the production process and strong acid and alkali treatment, so that not only is the energy consumption extremely high, but also a large amount of wastewater and waste gas are generated, the environment-friendly treatment cost is high, the national environment-friendly development industry outline requirement is not met, and on the other hand, the titanium dioxide raw material cost is high, so that the production cost of downstream enterprises is high, and the need of searching for a low-cost alternative scheme is urgent. In the prior art, kaolin and silicon dioxide powder have the advantages of high whiteness, stable chemical property, raw material cost of only 1/3-1/2 of that of titanium white powder and the like, and are tried to be used for preparing white pigment. However, the natural mineral-based pigment has deadly short plates, wherein the particles are easy to agglomerate to cause poor dispersibility, the crystalline covering structure of the titanium pigment is lacked, the covering power is only 60-70% of that of the titanium pigment and cannot meet the application requirements of middle and high ends, meanwhile, the conventional process has fuzzy parameter control on key links such as grinding, calcining and the like (such as undefined grinding media, heating rate and the like), so that the product performance fluctuation is large, the weather resistance and the application suitability are insufficient, and the large-scale popularization is difficult. Disclosure of Invention The invention aims to provide novel white pigment porcelain powder and a preparation process thereof, which are used for solving the problems to be solved in the background technology. In order to achieve the aim, the novel white pigment porcelain powder comprises, by weight, 11-12 parts of kaolin powder, 6-8 parts of silicon dioxide powder, 30 parts of meta-titanic acid, 1 part of nano-alumina and 0.4-0.5 part of an aminosilane coupling agent. As a further description of the above technical solution: The preparation process of the novel white pigment porcelain powder comprises the following steps: Firstly, raw material pretreatment, namely selecting kaolin powder, silicon dioxide powder, metatitanic acid, nano alumina and an aminosilane coupling agent according to the corresponding parts by weight, wherein the whiteness of the kaolin powder is 95, the diameter is less than or equal to 5um, the whiteness of the silicon dioxide is more than or equal to 98, the diameter is less than or equal to 5um, the purity of the metatitanic acid is more than or equal to 98%, the metatitanic acid is screened by a 200-mesh screen, the granularity of the nano alumina is less than or equal to 200nm, and the purity is more than or equal to 99.5%; Adding pure water with the same mass parts as the manufacturing raw materials after the pretreatment according to the principle of the step one, uniformly mixing the pure water with the manufacturing raw materials, and then filling the mixture into a ball mill, wherein the linear speed of the ball mill is 200m/min, the grinding time is 5-6h, and the middle line of powder particles is slurry with the size of 1.2-1.5 mu m; Step three, dehydration, namely dehydrating the slurry in the step two by adopting a high-speed centrifugal machine to ensure that the water content of the slurry is less than or equal to 8 percent; Step four, drying, calcining and modifying, namely delivering the dehydrated slurry into a kiln for calcining treatment, and carrying out three-stage calcining treatment and modification by using the kiln; crushing, grinding and grading, namely crushing the large-particle material formed after calcination, then conveying the large-particle material into a Raymond mill for grinding, and carrying out air flow grading to obtain uniform powder; and step six, surface treatment, namely selecting a surface treatment mode according to the application of the product to obtain a porcelain powder finished product. In the prior art, kaolin and silicon dioxide powder have the advantages of high whiteness, stable chemical property, raw material cost of only 1/3-1/2 of that of titanium white powder and the like, and are tried to be used for preparing white pigment. The invention uses kaolin powder and silicon dioxide powder as main raw ma