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Method for preparing high-purity transparent silica micro powder for pouring sealant

A technology of silica and potting glue, applied in the direction of silica, silica, etc., can solve the problems of poor wettability, easy ion migration, poor electrical properties, etc., and achieve good crack resistance, high transparency, and good transparency Effect

Active Publication Date: 2014-11-26
JIANGSU NOVORAY NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many types of fillers used for potting glue, but there are the following problems: 1. The fillers are easy to settle, have poor fluidity, poor wettability, and are easy to crack; 2. Poor electrical properties, easy ion migration, and high-voltage breakdown; 3. The transparency of the obtained glue is poor, which will affect the original color of the glue

Method used

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  • Method for preparing high-purity transparent silica micro powder for pouring sealant
  • Method for preparing high-purity transparent silica micro powder for pouring sealant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1, a kind of preparation method of the high-purity transparent silicon dioxide micropowder that is used for encapsulant, its steps are as follows:

[0021] (1) Raw material selection: use manual crushing to obtain quartz blocks with a particle size of ≤10cm and a particle size of 20-50cm as raw materials, and SiO in the quartz block raw materials 2 Content≥99.7%, moisture≤0.1%, Fe 2 o 3 ≤0.03%, Al 2 o 3 ≤0.03%;

[0022] (2) Pre-crushing of raw materials: two raw materials with a particle size of ≤10cm and a particle size of 20-50cm are put into a dry ball mill for crushing according to a weight ratio of 1:1, and a semi-finished powder with D50= 5μm is obtained;

[0023] (3) Powder block preparation: add the aforementioned semi-finished powder into the wet ball mill, and add pure water into the wet ball mill. The weight ratio of semi-finished powder to pure water is 2:4. After grinding for 10 hours, D50= 5 μm slurry, wherein the slurry with a particle siz...

Embodiment 2

[0025] Embodiment 2, in the preparation method according to embodiment 1, its steps are as follows:

[0026] (1) Raw material selection: use manual crushing to obtain quartz blocks with a particle size of ≤10cm and a particle size of 20-50cm as raw materials, and SiO in the quartz block raw materials 2 Content≥99.7%, moisture≤0.1%, Fe 2 o 3 ≤0.03%, Al 2 o 3 ≤0.03%;

[0027] (2) Pre-crushing of raw materials: two raw materials with a particle size of ≤10cm and a particle size of 20-50cm are put into a dry ball mill for crushing according to a weight ratio of 1:5, and a semi-finished powder with D50= 30μm is obtained;

[0028] (3) Powder block preparation: add the aforementioned semi-finished powder to the wet ball mill, and add pure water to the wet ball mill. The weight ratio of semi-finished powder to pure water is 8:10. After grinding for 40 hours, D50= 15μm slurry, wherein the slurry with a particle size of less than 1μm≤10%; put the slurry into a wooden barrel covered...

Embodiment 3

[0030] Embodiment 3, in the preparation method according to embodiment 1, its steps are as follows:

[0031] (1) Raw material selection: use manual crushing to obtain quartz blocks with a particle size of ≤10cm and a particle size of 20-50cm as raw materials, and SiO in the quartz block raw materials 2 Content≥99.7%, moisture≤0.1%, Fe 2 o 3 ≤0.03%, Al 2 o 3 ≤0.03%;

[0032] (2) Pre-crushing of raw materials: two raw materials with a particle size of ≤10cm and a particle size of 20-50cm are put into a dry ball mill for crushing according to a weight ratio of 1:3, and a semi-finished powder with D50= 20μm is obtained;

[0033] (3) Powder block preparation: add the aforementioned semi-finished powder into the wet ball mill, and add pure water into the wet ball mill. The weight ratio of the semi-finished powder to pure water is 5:8. After grinding for 25 hours, D50= 10μm slurry, wherein the slurry with a particle size of less than 1μm≤10%; put the slurry into a wooden barrel ...

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Abstract

The invention discloses high-purity transparent silica micro powder for a pouring sealant and a preparation method of the high-purity transparent silica micro powder. The preparation method comprises the following steps: crushing silicon carbide raw materials, sequentially performing ball milling through a dry-method ball mill and a wet-method ball mill, grading, crushing and drying the obtained slurry, and performing magnetic separation to obtain the product. The silica micro powder obtained by the invention is high in purity, and the prepared glue solution and condensate are high in transparency. In addition, due to special particle size distribution, the problem that the pouring sealant is easy to settle, low in liquidity and low in wettability due to use of other fillers is solved, the produced product is good in cracking resistance, the silica micro powder is high in purity, and the problem that the pouring sealant is poor in electrical properties such as low ion migration and high-voltage breakdown due to other fillers is solved. Meanwhile, the silica micro powder is high in transparency, the primary color of the glue solution is not influenced, and the appearance of the product meets the requirement.

Description

technical field [0001] The invention relates to a method for preparing silicon carbide micropowder, in particular to a method for preparing high-purity transparent silica micropowder used for potting glue. Background technique [0002] Electronic products need to be treated with potting glue during the preparation process. There are many types of fillers used for potting glue, but there are the following problems: 1. The fillers are easy to settle, have poor fluidity, poor wettability, and are easy to crack; 2. Poor electrical properties, easy ion migration, and high-voltage breakdown; 3. The transparency of the obtained glue is poor, which will affect the original color of the glue. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a simple and efficient production process for the preparation of high-purity transparent silica micropowder for potting glue, aiming at the deficiencies of the prior art. [0004] Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 毛艳姜兵陈永亚
Owner JIANGSU NOVORAY NEW MATERIAL CO LTD
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