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Method for preparing hydrophobic precipitated silicon dioxide

A technology of precipitating silica and hydrophobicity, which is applied in dyeing organosilicon compound treatment, dyeing physical treatment, fibrous filler, etc. It can solve the problems of poor stability and inability to exert foam removal performance, etc.

Active Publication Date: 2011-12-21
JIANGSU SIXIN SCI-TECH APPL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Poor stability in defoaming agent components, can not exert good defoaming performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In a 500mL beaker, put 100g of hydrogen-containing polydimethylsiloxane Me with a viscosity of 20mPa·s and a side chain hydrogen content of 0.1%. 3 SiO(MeHSiO) 2 (Me 2 SiO) 20 SiMe 3 And 0.1g 1% chloroplatinic acid isopropanol solution, warming up to 80 ℃, drop 30g structural formula CH 2 =CHCH 2 O(EO) 20 (PO) 12 Add H polyether, 20g vinyltrimethoxysilane, and 2g 3-aminopropyltrimethoxysilane dropwise for 2 hours, and maintain the temperature at 80°C during the dropwise addition. After the dropwise addition, the temperature was raised to 100° C. for 4 hours to obtain the surface modifier S1.

[0038] Mix 200g of precipitated silica masterbatch and 8g of surface modifier S1 evenly at room temperature, then shear at high speed for 0.5h; then press filter to remove deionized water, put it in an oven for 5h at 150°C; after drying, pass through a pulverizer After crushing, fluffy hydrophobic precipitated silica is obtained.

Embodiment 2

[0040]In a 500mL beaker, put 100g of hydrogen-containing polydimethylsiloxane Me with a viscosity of 100mPa·s and a side chain hydrogen content of 0.17%. 3 SiO(MeHSiO) 10 (Me 2 SiO) 70 SiMe 3 And 0.09g 1% chloroplatinic acid isopropanol solution, warming up to 100 ℃, drop 13g structural formula CH 2 =CHCH 2 O(EO)(PO) 14 The polyether H and 23g of vinyltrimethoxysilane were added dropwise for 1 hour, and the temperature was maintained at 100°C during the dropwise addition. After the dropwise addition, the temperature was raised to 120° C. for 2 hours to obtain the surface modifier S2.

[0041] After mixing 200g of precipitated silica masterbatch and 12g of surface modifier S2 at room temperature, shear at high speed for 0.5h; then press filter to remove deionized water, put it in an oven for 15h at 100°C; after drying, pass through a pulverizer After crushing, fluffy hydrophobic precipitated silica is obtained.

Embodiment 3

[0043] In a 500mL beaker, put 100g of dihydrogen-terminated polyorganohydrogensiloxane HMe with a hydrogen content of 0.15% and a viscosity of 30mPa·s 2 SiO(Me 2 SiO) 16 SiMe 2 H and 0.24g 1% isopropanol solution of chloroplatinic acid, warming up to 100°C, add dropwise 40g of CH 2 =CHCH 2 CH 2 O(EO) 4 (PO) 12 CH 3 Polyether, 15g of vinyltriethoxysilane, and 5g of 12-aminododecyltrimethoxysilane were added dropwise for 1 hour, and the temperature was maintained at 100°C during the dropwise addition. After the dropwise addition, the temperature was raised to 120° C. for 4 hours to obtain the surface modifier S3.

[0044] After mixing 200g of precipitated silica masterbatch and 12g of surface modifier S3 at room temperature, shear at high speed for 0.5h; then press filter to remove deionized water, put it in an oven for 6h at 260°C; after drying, pass through a pulverizer After crushing, fluffy hydrophobic precipitated silica is obtained.

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PUM

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Abstract

The invention provides a method for preparing hydrophobic precipitated silicon dioxide through carrying out hydrophobic treatment on hydrophilic precipitated silicon dioxide. Firstly, poly organic hydrogenous siloxane, coupling agents and polyether take polymerization reaction under the effect of acid catalysts to obtain surface modifiers, then, the hydrophobic treatment, the baking and the crushing are carried out on the hydrophilic precipitated silicon dioxide under the high-speed shearing to obtain the fluffy hydrophobic precipitated silicon dioxide. The hydrophobic precipitated silicon dioxide obtained by the method has the advantages of small particle diameter, large specific area, lower water absorption performance and the like, can be used in the fields of engineering plastics, silicon rubber, binding agents, dyestuff, coating, defoaming agents, polyurethane and the like and can be used as dispersing agents, filling agents and defoaming agents in the fields.

Description

technical field [0001] The invention relates to a process for preparing hydrophobic precipitated silicon dioxide by subjecting hydrophilic precipitated silicon dioxide to hydrophobic treatment. technical background [0002] Silica is divided into hydrated silica (called precipitated silica) produced by precipitation method or thermal cracked silica (called fumed silica) produced by gas phase method, collectively referred to as ordinary silica, which are all amorphous silica. The existing hydrophobic silica is produced by using these two types of ordinary silica as basic raw materials, and is a white, non-toxic, amorphous fine powder. The primary particle size is generally 10-40nm, and because the surface contains more hydroxyl groups, it is easy to absorb water and become aggregated fine particles. [0003] Silica has excellent properties such as porosity, large internal surface area, high dispersibility, light weight, good chemical stability, high temperature resistance, ...

Claims

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Application Information

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IPC IPC(8): C09C1/28C09C3/12C09C3/04
Inventor 黄伟吴飞任意杨有忠曹添
Owner JIANGSU SIXIN SCI-TECH APPL RES INST CO LTD
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