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High-purity quartz sand coating binder for polycrystalline silicon ingot quartz crucible and preparation method thereof

A high-purity quartz sand and quartz crucible technology, which is applied in the field of binders, can solve problems such as increased oxygen content of silicon ingots, poor coating compactness, and excessive area, achieving enhanced barrier effect, reduced oxygen content, and simple process Effect

Active Publication Date: 2019-10-01
河北硅研电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the poor compactness of the quartz sand coating in the existing technology, which leads to the increase of the oxygen content of the silicon ingot, and the excessively large area of ​​the minority carrier lifetime <2us in the silicon ingot, etc., the present invention provides high-purity quartz sand for the polycrystalline silicon ingot quartz crucible Coating binder and preparation method thereof

Method used

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  • High-purity quartz sand coating binder for polycrystalline silicon ingot quartz crucible and preparation method thereof

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preparation example Construction

[0047] In one embodiment, the preparation method at least includes the following steps:

[0048] (1) Weigh each raw material component according to the raw material ratio;

[0049] (2) Add water-soluble siloxane or carboxy-modified polymer, silica sol, plasticizer, defoamer, and bactericide into high-purity water, and perform mixing treatment to obtain the first mixed material;

[0050] (3) At 30-80°C, pass the first mixed material through an exchange resin to remove metal ions to obtain a second mixed material;

[0051] (4) Add the pH buffer solution to the second mixed material, perform mixing treatment, adjust the pH value to 5-9, and obtain the high-purity quartz sand coating binder for the polysilicon ingot quartz crucible.

[0052] The above-mentioned preparation method is further explained below:

[0053]Preferably, in step (2), the stirring rate of the mixing treatment is 100-200r / min, and the stirring time is 60-120min; in step (4), the stirring rate of the mixing t...

Embodiment 1

[0058] High-purity quartz sand coating binder for polysilicon ingot quartz crucible. Including the following raw material components in mass percentage:

[0059] Silicone modified polyvinyl alcohol 10%;

[0060] High-purity silica sol 10%;

[0061] Ethanol 1%;

[0062] Ethylene glycol 2%;

[0063] Polyether modified siloxane 0.1%;

[0064] Acetic acid-ammonium acetate buffer 0.01%;

[0065] Isothiazolinone 0.05%;

[0066] High-purity water 76.84%.

[0067] The preparation method of polycrystalline silicon ingot quartz crucible high-purity quartz sand coating binder comprises the following steps:

[0068] (1) Weigh each raw material component according to the raw material ratio;

[0069] (2) Add siloxane-modified polyvinyl alcohol, high-purity silica sol, ethanol, ethylene glycol, polyether-modified siloxane, and isothiazolinone into high-purity water, stir at 150r / min for 90min, and mix Material processing, to obtain the first mixed material;

[0070] (3) At 30°C, pa...

Embodiment 2

[0073] High-purity quartz sand coating binder for polysilicon ingot quartz crucible. Including the following raw material components in mass percentage:

[0074] Silicone modified polyvinylpyrrolidone 8%;

[0075] High-purity silica sol 10%;

[0076] Ethanol 3%;

[0077] Glycerin 2%;

[0078] Emulsified silicone oil 0.1%;

[0079] Citric acid-ammonium citrate buffer 0.03%;

[0080] Isothiazolinone 0.05%;

[0081] High-purity water 74.82%.

[0082] The preparation method of polycrystalline silicon ingot quartz crucible high-purity quartz sand coating binder comprises the following steps:

[0083] (1) Weigh each raw material component according to the raw material ratio;

[0084] (2) Add siloxane-modified polyvinylpyrrolidone, high-purity silica sol, ethanol, glycerin, emulsified silicone oil, and isothiazolinone into high-purity water, stir at 100r / min for 120min, and perform mixing treatment to obtain the first mixture material;

[0085] (3) At 80°C, pass the first m...

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Abstract

The invention related to the technical field of adhesives, and particularly discloses an adhesive for a high-purity quartz sand coating of a quartz crucible for polycrystalline silicon ingot casting and a preparation method of the adhesive. The adhesive for the high-purity quartz sand coating of the quartz crucible for polycrystalline silicon ingot casting is prepared from, by mass, 10-20% of water-soluble siloxane or carboxyl modified polymer, 10-20% of silica sol, 1-5% of plasticizer, 0.05-0.3% of antifoaming agent, 0.01-0.05% of pH buffer solution, 0.03-0.3% of sterilizing agent and 70-85% of high-purity water. The adhesive for the high-purity quartz sand coating of the quartz crucible for polycrystalline silicon ingot casting is high in purity, and is a novel adhesive and dispersion material for the high-purity quartz sand coating, the compactness of the high-purity quartz sand coating is improved, meanwhile, the high-purity quartz sand coating is enabled to be better attached to a silicon nitride coating, the lateral red area of a silicon ingot is reduced, and the oxygen content of the silicon ingot is reduced.

Description

technical field [0001] The invention belongs to the technical field of binders, in particular to a high-purity quartz sand coating binder for polycrystalline silicon ingot quartz crucibles and a preparation method thereof. Background technique [0002] Silicon nitride is the key auxiliary material for polycrystalline ingots in the polycrystalline production process. Silicon nitride has good high temperature resistance, chemical stability, and compactness. It is a strong covalent bond compound with low self-diffusion coefficient and resistance to impurities. It has strong diffusion and water vapor penetration ability, and has good anti-oxidation, anti-corrosion and anti-friction properties, and does not react with molten silicon, which is very suitable for the requirements of crucible coating in the process of purifying polysilicon. [0003] However, the barrier effect of the traditional silicon nitride coating is limited. Due to the large amount of impurities in the body of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08L39/06C08L83/12C08L83/04C08K13/02C08K3/36C08K5/053C08K5/47C04B12/00C04B41/89
Inventor 朱斌仵靖
Owner 河北硅研电子材料有限公司