Porous silica microsphere preparation method

A technology of porous silica and microspheres, which is applied in the chemical field, can solve the problems of inability to flexibly control the size of silica microspheres and pores, and high requirements for spray technology, and achieves low equipment cost, simple preparation method, and wide application. Effects in the field of application

Active Publication Date: 2013-05-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the above technologies, the preparation of porous silica microspheres by spray technology requires high spray technology and requires special spray equipment
However, the cell wal

Method used

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  • Porous silica microsphere preparation method
  • Porous silica microsphere preparation method
  • Porous silica microsphere preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 500 grams of fully vulcanized silicone rubber emulsion (Beijing Research Institute of Chemical Industry, solid content 28%) and 200 grams of fully vulcanized styrene-butadiene rubber emulsion (Beijing Research Institute of Chemical Industry, solid content 45%) are blended by mechanical stirring to obtain a stable blend Lotion. Then, 100 grams of fully vulcanized silicone rubber and fully vulcanized styrene butadiene rubber composite microspheres were prepared by spray drying method, spray dryer (made by Beijing Research Institute of Chemical Industry), inlet temperature of 150°C, outlet temperature of 60°C.

[0023] Weigh 20 grams of the above-prepared composite microspheres in a crucible, put them in a muffle furnace, and ablate at 400°C for 300 minutes under air conditions. 3.1 g of porous silica microspheres were obtained. The average pore diameter is 140 nanometers.

[0024] Compared figure 1 with figure 2 ,visible: figure 1 No holes can be seen on the surface of the...

Embodiment 2

[0026] Put 20 grams of ultrafine fully vulcanized silicone rubber and fully vulcanized styrene-butadiene rubber micron-sized composite microspheres (same as Example 1) in a crucible and placed in a muffle furnace. Under air conditions, at 500 ℃, ablation 180 minute. 3.2 g of porous silica microspheres were obtained. The average pore diameter is 124 nanometers.

Embodiment 3

[0028] Put 20 grams of ultrafine fully vulcanized silicone rubber and fully vulcanized styrene-butadiene rubber micron composite microspheres (same as Example 1) in a crucible, put in a muffle furnace, and ablate 40% under air conditions at 800°C minute. 3.0 g of porous silica microspheres were obtained. The average pore diameter is 104 nanometers.

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Abstract

The invention discloses a porous silica microsphere preparation method, which comprises: mixing a template structure and a completely-vulcanized silicone rubber emulsion, carrying out spray drying, and burning to prepare porous silica microspheres, wherein the completely-vulcanized silicone rubber emulsion is prepared through carrying out irradiation on an organic silicone polymer emulsion or a copolymer emulsion, the template structure is a completely-vulcanized silicone rubber emulsion-free completely-vulcanized rubber emulsion, the solid content in the template structure is 2-50% of the total solid content in the mixed emulsion, a burning temperature is 250-1200 DEG C, and a burning time is 10-600 min. The porous silica microsphere preparation method has characteristics of simpleness and low equipment cost, wherein the formed hole is large.

Description

Technical field [0001] The invention relates to the field of chemistry, and more specifically, to a method for preparing porous silica microspheres. Background technique [0002] Porous silica microspheres have a large specific surface area, appropriate pH and excellent thermal stability. It has a wide range of applications in many fields. It can be used as liquid chromatography stationary phase, high-efficiency catalyst carrier, polymer material enhancer, adsorbent, matting agent, filtration and separation material, ion exchange, ink modification, surface modification of high-grade photo paper, etc. [0003] Based on the wide application of porous silica microspheres, its preparation process has been extensively researched and developed. According to different technical principles, it can be divided into three categories: (1) stacking silica beads method; (2) Sol-gel method; (3) spray drying method. US Pat 3782075 and US Pat 3855172 prepare porous silica microspheres by stackin...

Claims

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Application Information

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IPC IPC(8): C01B33/12B82Y40/00
Inventor 戚桂村张晓红高建明宋志海李秉海蔡传伦张红彬王亚赖金梅
Owner CHINA PETROLEUM & CHEM CORP
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