Low-silicone alcohol silica

A technology of silica and silylated silica, applied in the directions of silicon oxide, silicon dioxide, instruments, etc., can solve the problems of low service life, poor exposure stability, instability and so on

Inactive Publication Date: 2009-05-27
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the disadvantage is that the alcohol must be disposed of later as an organic load, discharged to air or water
Consequences of this separation include instability and low lifetime of the system, such as poor exposure stability to repeated copying and activation processes in the case of toner-silica mixtures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1—1

[0328] In a continuous device, at a temperature of 105°C and an inert gas (N 2 ) environment, add 50g / h very fine deionized water (DI water) to hydrophilic silica with a mass flow rate of 1000g / h, its moisture content is 2 / g (according to DIN 66131 and 66132, measured by BET method) (its trade name is WACKER HDK N20, Wacker-Chemie GmbH, Burghausen, D); 150g / h of OH-terminated polydimethylsiloxane ( PDMS) (viscosity of 40mPas at 25°C temperature), atomized into a very fine liquid via a single-fluid nozzle (pressure: 10 bar), and 30g / h of dimethyldichlorosilane was added through a single-fluid nozzle ( Pressure: 7 bar) Added by atomization. After dwelling at 105°C for 2h, the silica was further fluidized by stirring, and then reacted in a lower reactor at 300°C. Then in a mechanically stirred dryer, at a temperature of 250 ° C and N 2 Purification was performed by removing HCl at a flow rate of 0.3 cm / s. 20% of by-reaction products and reaction purification spoilage products...

Embodiment 1—2

[0330] In a continuous device, at a temperature of 105°C and an inert gas (N 2 ) environment, add 50g / h of DI water to the hydrophilic silica with a mass flow rate of 1000g / h, its moisture content 2 Purification was performed by removing HCl at a flow rate of 0.3 cm / s. 50% of by-reaction products and reaction purification spoilage products are recycled to the coating step. The product is a white hydrophobic silica powder with a uniform coating of silylating agent. The data are shown in Table 1-1.

Embodiment 1—3

[0332] In a continuous device, at a temperature of 105°C and an inert gas (N 2 ) environment, add 50g / h of very fine DI water to hydrophilic silica with a mass flow rate of 1000g / h, its moisture content is 2 / g (according to DIN 66131 and 66132, measured by BET method) (its trade name is WACKERHDK N20, Wacker-Chemie GmbH, Burghausen, D); the viscosity of 150g / h OH-terminated PDMS at 25°C is 40 mPas, atomized into a very fine liquid through a single-fluid nozzle (pressure: 10 bar), and 50 g / h of hexamethyldisilazane was atomized and added through a single-fluid nozzle (pressure: 5 bar). After dwelling at 25°C for 2.5 hours, the loaded silica was further fluidized by agitation and then allowed to react in a lower reactor at 80°C. After the Sui Dynasty, in a mechanically stirred dryer, at a temperature of 140 ° C and N 2 Removal of NH at a flow rate of 0.3cm / s 3 to be purified. 33% of by-reaction products and reaction purification spoilage products were recycled to the coating ...

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Abstract

A silica silylate having a SiOH density of less than 0.6/nm based on the specific surface area of ​​the BET method 2 (DIN 66131 and 66132).

Description

technical field [0001] The present invention relates to silica silylate and a process for its preparation. Background technique [0002] Based on the surface area of ​​BET method (DIN 66131 and 66132), corresponding to more than 0.6 / nm 3 Silica silylate with a residual silanol content exceeding the silanol content of the parent silica by 25% has the following disadvantages: [0003] Via the hydrogen bonds between the silanol groups on the silica surface, a residual silanol content of more than 25% leads to a strong interaction between the silica particles and thus a severe thickening effect, during which a high filling degree is obtained inwardly in the polymer and resin system, This thickening effect is destroyed. [0004] In powder systems, residual silanol contents of more than 25% lead to particle interaction and thus reagglomeration and segregation. This phenomenon has an adverse effect on the flow characteristic stability and triboelectric stability of powder system...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/12G03G9/00C08L83/04G03G9/08C01B33/18C08K3/36C08L101/00C09C1/30G03G9/097
CPCC01P2006/12C09C1/3081G03G9/09725C01B33/18
Inventor 赫伯特·巴特尔马里奥·海涅曼弗朗茨·格林瓦尔德赫尔穆特·乌吉诺特乌特·弗尔克尔
Owner WACKER CHEM GMBH
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