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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: 2013-09-25
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 a polydimethylsiloxane Me with a viscosity of 20mPa·s and a hydrogen content of 0.1% side chain hydrogen. 3 SiO(MeHSiO) 2 (Me 2 SiO) 20 SiMe 3 And 0.1g of 1% chloroplatinic acid isopropanol solution, heat up to 80℃, and add 30g dropwise with the structure of CH 2 =CHCH 2 O(EO) 20 (PO) 12 H polyether, 20 g vinyl trimethoxy silane, 2 g 3-aminopropyl trimethoxy silane were added dropwise for 2 h, and the temperature was maintained at 80° C. during the dropping process. After the dripping is completed, the temperature is raised to 100° C. to react for 4 hours to obtain the surface modifier S1.

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

Embodiment 2

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

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

Embodiment 3

[0043] In a 500mL beaker, put 100g of a polyorganohydrogen silicone HMe with a viscosity of 30mPa·s and a hydrogen content of 0.15%. 2 SiO(Me 2 SiO) 16 SiMe 2 H and 0.24g of 1% chloroplatinic acid isopropanol solution, heat up to 100℃, and add 40g dropwise with the structure of CH 2 =CHCH 2 CH 2 O(EO) 4 (PO) 12 CH 3 Polyether, 15 g vinyl triethoxy silane, 5 g 12-aminododecyl trimethoxy silane were added dropwise for 1 hour, and the temperature was maintained at 100° C. during the dropping process. After the dripping is completed, the temperature is raised to 120° C. and reacted for 4 hours to obtain the surface modifier S3.

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

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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 silica by subjecting hydrophilic precipitated silica to hydrophobic treatment. technical background [0002] Silica is divided into hydrated silica prepared by precipitation method (called precipitated silica) or thermally cracked silica prepared by gas phase method (called fumed silica), collectively referred to as ordinary silica, they are all amorphous Silica. The existing hydrophobic silica is produced using these two types of ordinary silica as basic raw materials, and is a white, non-toxic, amorphous fine powder. The original particle size is generally 10-40nm, 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, non-combustibility, and good e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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