Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparing method for SiO2 coating pyrophyllite powder

A pyrophyllite powder, coating technology, applied in the direction of aluminum silicate, silicate, etc.

Inactive Publication Date: 2012-09-05
WENZHOU UNIV
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Through the analysis of the current domestic and foreign literature, scientific and technological workers at home and abroad have a good understanding of SiO 2 Coating technology is mainly used in the improvement of moisture resistance and weather resistance of luminous powder and pearlescent pigments. There is no precedent for the application of pyrophyllite surface coating

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 40 parts of pyrophyllite powder calcined at 600° C. for 2 hours to 400 parts of deionized water, heat up to 70° C. under constant stirring, and keep warm for 0.5 hours to obtain a pyrophyllite slurry. Use 5wt% analytical pure HCl solution to adjust the pH of the pyrophyllite slurry to 8.5, then add 200ml of 5wt% sodium silicate solution dropwise at a rate of 0.5ml / min, and simultaneously use 5wt% analytical pure HCl solution to adjust the pyrophyllite slurry The pH value was stabilized at 8.5±0.2. After the dropwise addition of the sodium silicate solution was complete, stirring was continued for 0.5 hours. Then filter, dry, dry, and calcined at 600°C for 2 hours to obtain SiO2-coated pyrophyllite powder.

Embodiment 2

[0018] Add 60 parts of pyrophyllite powder calcined at 600° C. for 2 hours to 400 parts of deionized water, heat up to 70° C. under constant stirring, and keep warm for 0.5 hours to obtain a pyrophyllite slurry. Adjust the pH=8.5 of the pyrophyllite slurry with 5wt% analytical pure HCl solution, then add dropwise 200ml of 5wt% sodium silicate solution at a speed of 1ml / min, and simultaneously adjust the pH of the pyrophyllite slurry with 5wt% analytical pure HCl solution The pH was stabilized at 8.5 ± 0.2. After the dropwise addition of the sodium silicate solution was complete, stirring was continued for 0.5 hours. Then filter, dry, dry, and calcined at 600°C for 2 hours to obtain SiO 2 Coated pyrophyllite powder.

Embodiment 3

[0020] Add 60 parts of pyrophyllite powder calcined at 600° C. for 2 hours to 500 parts of deionized water, heat up to 80° C. under constant stirring, and keep warm for 0.5 hours to obtain a pyrophyllite slurry. Adjust the pH=9.0 of the pyrophyllite slurry with 10wt% analytical pure HCl solution, then add dropwise 150ml of 10wt% sodium silicate solution at a speed of 2ml / min, and simultaneously adjust the pH of the pyrophyllite slurry with 10wt% analytical pure HCl solution The pH was stabilized at 9.0 ± 0.2. After the dropwise addition of the sodium silicate solution was complete, stirring was continued for 0.5 hours. Then filter, dry, dry, and calcined at 600°C for 2 hours to obtain SiO 2 Coated pyrophyllite powder.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention relates to a preparing method for SiO2 coating pyrophyllite powder by using a hydrolysis and deposit technique of inorganic salt. pyrophyllite powder is used as raw material, sodium silicate is used as a coating agent, diluted acid is used as a pH value modifying agent to coat a layer of SiO2 thin film on pyrophyllite. In the basic process, pyrophyllite powder with certain specification requirement which is calcined in high temperature is put into a quantity of deionized water to be stirred and dispersed into suspending liquid. The suspending liquid is heated up to certain temperature, the pH value of the suspending liquid is adjusted to a certain range by the diluted acid, a quantity of sodium silicate solution is added, and meanwhile, the constant of the pH value of the suspending liquid is kept by the diluted acid. After the sodium silicate solution is added, the suspending liquid is insulated and stirred for a long time, and then, the suspending liquid is filtered, dried and calcined to obtain the products of present invention. The present invention has the advantages of simple equipment, convenient operation and low product cost, and is easy to commercial production.

Description

technical field [0001] The present invention relates to a SiO 2 The preparation method of the coated pyrophyllite powder adopts the inorganic salt hydrolysis deposition technology to prepare the powder of the present invention. Background technique [0002] Pyrophyllite [Al 2 (OH) 2 (Si 2 o 5 ) 2 ] 2 It is a kind of clay mineral, mainly composed of quartz, kaolinite, and sericite. It belongs to the crystal structure 2:1 layered hydrous aluminosilicate mineral. The structural unit layer consists of two "silicon-oxygen tetrahedrons", one The "gibbsite layer" composition. The theoretical chemical composition is: Al 2 o 3 28.3%, SiO 2 66.7%, H 2 O 5.0%, in addition to containing a small amount of impurities such as Fe, Mg, Ca, K, Na. [0003] Naturally produced pyrophyllite is fine and smooth in texture and low in hardness (1-2). Because low-aluminum pyrophyllite contains K, impurities such as Na, its weather resistance, chemical corrosion resistance are all poore...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/26
Inventor 刘海涛林实俄张景峰翁学军林雪青
Owner WENZHOU UNIV