Preparation method of porous light silicon dioxide filler

A lightweight silica, pulping technology, applied in chemical instruments and methods, fibrous fillers, inorganic pigment treatment, etc., can solve the problems of high cost, low strength, difficult recycling of waste, etc. The effect of low surface area and low oil absorption

Active Publication Date: 2020-07-31
ANHUI ESTONE MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Patent CN103342368A provides a preparation method of hollow silica microspheres, which uses compound lye and wetting additives to corrode solid silica into hollow silica, and this method can obtain lightweight hollow silica spheres , but the specific gravity of the obtained silica is difficult to control, the shell is thin, the strength is low, the waste is difficult to recycle, and it is difficult to realize industrialization
[0006] Patent CN106430222A provides a nano-silica microsphere and its preparation method, using the polymer core body as a template, polyalkoxysiloxane as a silicon source, and removing the polymer core body after reacting in the water phase to form Lightweight silica spheres, this method is complicated to operate, high in cost, and difficult to realize industrialization

Method used

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  • Preparation method of porous light silicon dioxide filler
  • Preparation method of porous light silicon dioxide filler
  • Preparation method of porous light silicon dioxide filler

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Experimental program
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Effect test

Embodiment 1

[0032] The precipitated silica was made into a slurry with a mass concentration of 10%, and silica sol accounting for 6% of the mass of the silica was added under stirring, and the ion was cleaned until the conductivity was 45 μS / cm. After ion cleaning, put it into the freezer, control the temperature at -14°C, freeze for 12 hours, freeze it completely, raise the temperature until the slurry is completely melted, remove the supernatant, put it into the freezer again, adjust the freezing according to the above, and then thaw, remove The supernatant was repeated three times, concentrated and filtered with suction. After suction filtration, the cake was dried at 150°C for 24 hours, and the dried material was placed in a muffle furnace for calcination at 1000°C for 10 hours with a heating rate of 5°C / min. The calcined product is crushed, ground, jet milled, classified, and processed into a powder with a median particle size of 15um. The powder is passed into the flash furnace wit...

Embodiment 2

[0034] The precipitated silica was made into a slurry with a mass concentration of 10%, and the silica sol accounting for 10% of the mass fraction of the silica was added under stirring, and the ion was cleaned until the conductivity was 40 μS / cm. After ion cleaning, put it into the freezer. The temperature is controlled at -14°C, and the freezing time is 15 hours. It is completely frozen. The supernatant was repeated three times, concentrated and filtered with suction. After suction filtration, the cake was dried at 150°C for 30 hours. Place the dried material in a muffle furnace for calcination at 1000°C for 10h with a heating rate of 5°C / min. The calcined product is crushed, ground, jet milled, classified, and processed into a powder with a median particle size of 15um. The powder is passed into the flash furnace with oxygen carrier gas, the temperature of the flash furnace is 1700°C, and it is flashed for 25 minutes by air circulation in the high temperature area, flotat...

Embodiment 3

[0036] Fumed silica was made into a slurry with a mass concentration of 5%, and silica sol accounting for 8% mass fraction of silica was added under stirring, and ion cleaning was performed until the conductivity was 43 μS / cm. After ion cleaning, put it into the freezer, control the temperature at -14°C, freeze for 12 hours, freeze it completely, raise the temperature until the slurry is completely melted, remove the supernatant, put it into the freezer again, adjust the freezing according to the above, and then thaw, remove The supernatant was repeated 8 times, concentrated and filtered with suction. After suction filtration, dry the cake at 150°C for 20 hours. The dried material was calcined at 900°C for 15 hours in a muffle furnace, with a heating rate of 2°C / min. The calcined product is crushed, ground, jet-milled, classified, and processed into a powder with a median particle size of 20um. The powder is passed into the flash furnace with oxygen carrier gas, the temperat...

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Abstract

The invention discloses a preparation method of a porous light silicon dioxide filler, and relates to the technical field of inorganic materials, and the preparation method comprises the following steps: (1) pulping and cleaning; (2) freezing and concentrating; (3) drying and calcining; (4) crushing and grading; (5) high-temperature spray burning; (6) flotation classification. The silicon dioxideprepared by the method has the characteristics of light weight, porosity, high strength, low specific surface area and low oil absorption value, and particularly, the strength of the material is far higher than that of hollow materials such as hollow glass beads; the preparation method is easy to realize industrialization, and solves the problems that the glass beads are easy to break in the processing process, lose weight reduction after breaking and reduce the dielectric constant; and meanwhile, the prepared silicon dioxide has a spherical shape and is beneficial to large-proportion fillingin a resin matrix, so that the rigidity, the strength, the heat resistance, the wear resistance, the corrosion resistance, the machinability and the like of the resin matrix are improved.

Description

Technical field: [0001] The invention relates to the technical field of inorganic materials, in particular to a method for preparing a porous lightweight silica filler. Background technique: [0002] Porous lightweight silica filler has the characteristics of low density, good stability, and low dielectric constant. With the rise of the 5G industry, it has been more and more widely used. Porous lightweight silica is used in the copper clad laminate industry, which can replace the existing hollow glass beads, reduce the dielectric constant and specific gravity, and in addition, it can also improve the strength of the board. At the same time, the porous lightweight silica filler can also be applied to porous insulation boards, thermal insulation ceramic coatings, low-cost opening agents, coating matting agents, LOW-α silica, etc. [0003] Lightweight is a common topic related to the electronics industry. The many advantages of lightweight determine the huge market prospect of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/30C09C3/00C09C3/04C08K9/00C08K7/26
CPCC01P2004/03C01P2006/10C01P2006/12C01P2006/19C01P2006/21C01P2006/40C08K7/26C08K9/00C09C1/30C09C1/3009C09C1/3018C09C1/3027C09C3/003C09C3/006C09C3/04C09C3/041C09C3/043
Inventor 蒋学鑫郭敬新秦永法王韶晖
Owner ANHUI ESTONE MATERIAL TECH CO LTD
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