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Nano organic solvent silicasol and preparation method thereof

A technology of organic solvent and silica sol, applied in the field of nanomaterials, can solve the problem that organic silica sol cannot be absolutely water repellent and so on

Inactive Publication Date: 2005-11-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such silicone sols cannot be used in fields that are absolutely water-repellent and can withstand temperatures greater than 100°C and are afraid of acid-base corrosion

Method used

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  • Nano organic solvent silicasol and preparation method thereof
  • Nano organic solvent silicasol and preparation method thereof
  • Nano organic solvent silicasol and preparation method thereof

Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0039] (1). Weigh analytically pure sodium silicate reagent (Na 2 SiO 3 ·9H 2 O) 116.25 grams were dissolved in 383.75 milliliters of high-purity deionized water to prepare a 10% aqueous solution of sodium silicate.

[0040] (2). The Na 2 SiO 3 The aqueous solution is introduced from the ion exchange upper port, and the outlet piston of the ion exchange column equipped with the hydrogen-type cation exchange resin is opened to collect the exchange liquid. And constantly detect the pH value of the exchange liquid at the outlet, and replenish Na in time 2 SiO 3 solution. When the pH value of the exchange liquid became 4-5, the effluent exchange liquid was collected as a silica sol sample. When all Na 2 SiO 3 After adding the solution, continue to inject high-purity deionized water into the tube to replace the silica sol retained in the exchange column and collect all the products. When the pH value of the exchange liquid returned to 6-7, the collection was stopped. Rin...

specific Embodiment approach 2

[0045] According to the steps of Example 1, weigh the analytically pure sodium silicate reagent (Na 2 SiO 3 ·9H 2 O) 232.5 grams, dissolved in 267.5 milliliters of high-purity deionized water to prepare a 20% aqueous solution of sodium silicate. After ion exchange, excess water was distilled off by vacuum distillation to obtain 10% SiO 2 Hydrosol. will get H 4 SiO 4 After the solution was placed and aged at 70 °C for 2 hours, a certain amount of end-capping agent, such as triethoxysilane [CH 3 Si(OC 2 H 5 ) 3 ], so that the mass percentage concentration in the solution is 1.0%. Mix well and then age at room temperature for 24 hours. Mix SiO in a volume ratio of 10:9 2 Hydrosol and high-boiling ethylene glycol solvent, the mixture is loaded into a distillation apparatus for underpressure distillation, the pH of the mixed solution is controlled to be 9, all water is removed, and ethylene glycol silica sol is prepared. Its appearance is colorless, clear and transparen...

specific Embodiment approach 3

[0046] According to the steps of Example 1, take by weighing the analytically pure sodium silicate reagent (Na 2 SiO 3 ·9H 2 O) 384.8 grams, dissolved in 151.2 milliliters of deionized high-purity water to prepare a 30% aqueous solution of sodium silicate. After ion exchange, excess water was distilled off by vacuum distillation to obtain 15% SiO 2 Hydrosol. will get H 4 SiO 4 After the solution was placed and aged at 70 °C for 2 hours, a certain amount of end-capping agent, such as monomethyltriethoxysilane [CH 3 Si(OC 2 H 5 ) 3 ], so that the percentage concentration in the solution is 1.5%. Mix well and then age at room temperature for 24 hours. Mix SiO in a volume ratio of 10:9 2 Hydrosol and high-boiling ethylene glycol solvent, the mixture is loaded into a distillation apparatus for underpressure distillation, and the pH of the controlled mixed solution is 9 to prepare ethylene glycol silica sol. Its appearance is colorless, clear and transparent. Silica sol...

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Abstract

The invention discloses a nano organic solvent silicasol and preparation method, which mainly comprises SiO2 particles, organic solvent and end blocking agent by the proportion of SiO2 particles 5-15%, organic solvent 94.5-83.5%, end blocking agent 0.5-1.5%.The grain diameter of SiO2 is between 10-100 nanometer, the pH of the sol system be between 6-9. The sol is prepared through the conventional method for organic solvent silicon oxide sol with a boiling point higher then that of water. The preparation method employs sodium silicate as the raw material.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, in particular to a nanometer organic solvent silica sol and a preparation method thereof. Background technique [0002] SiO 2 Sol (also known as silica sol) is a polymer amorphous SiO 2 A colloidal solution of particles dispersed in a solvent. After American Bird invented the use of ion exchange to produce silica sol in 1941, silica sol has gradually been widely used in the manufacturing fields of fibers, fabrics, paper, coatings, adhesives, paints, ceramics, medicine, food, precision casting and electronic industries. ground application. Now, in the semiconductor industry, silica sol is used for precision polishing of silicon wafers, and the application prospect is very broad. [0003] Silica sol can be divided into water-solvent silica sol or organic solvent silica sol according to the different properties of the solvent. Water solvent silica sol SiO 2 Its concentration is gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/145
Inventor 何为王守绪王偕恕唐先忠
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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