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Precipitated silicas with special surface properties

A technology for precipitating silica, silica

Active Publication Date: 2012-09-05
EVONIK OPERATIONS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] So in summary, it can be stated that the prior art does not disclose any precipitated silica that would meet the exact requirements for use in RTV-1K silicone rubber

Method used

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  • Precipitated silicas with special surface properties
  • Precipitated silicas with special surface properties
  • Precipitated silicas with special surface properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0239] To 2m with inclined base, MIG inclined blade agitator system and Ekato fluid shear turbine 3 The precipitation vessel (diameter 160 cm) was filled with 1679 l of deionized water and the initial charge was heated to 92°C. After reaching the temperature, and within 100 minutes, water glass was metered in at a rate of 3.93 kg / min, and sulfuric acid was metered in at a rate of 0.526 kg / min with stirring. If appropriate, the metering rate of sulfuric acid must be corrected so that a pH of 8.5 is maintained during the entire precipitation time. Thereafter, the water glass feed was turned off, the temperature was maintained, and the precipitation suspension was acidified to a pH of 3 using the same sulfuric acid metering rate. The solids content of the precipitation suspension is 54 g / l.

[0240] The obtained suspension was filtered with a membrane filter press and the filter cake was washed with deionized water until the conductivity of the washing water was found to be <1mS / cm...

Embodiment 2

[0249] To 2m with inclined base, MIG inclined blade agitator system and Ekato fluid shear turbine 3 The precipitation vessel (diameter 160 cm) was charged with 1680 l of deionized water and the initial charge was heated to 92°C. After reaching the temperature, water glass was metered in at a rate of 3.93 kg / min and sulfuric acid was metered in at a rate of 0.526 kg / min under stirring conditions within 100 minutes. If appropriate, the metering rate of sulfuric acid must be corrected so that a pH of 8.5 is maintained throughout the precipitation period. Thereafter, the water glass feed was turned off, and the same sulfuric acid metering rate was used, and still at 92°C, the precipitation suspension was acidified to a pH of 3. At this time, the solid content of the precipitation suspension was 54 g / l.

[0250] The obtained suspension was filtered with a membrane filter press and the filter cake was washed with deionized water until the conductivity of the washing water was found to...

Embodiment 3

[0273] Example 3: Performance test

[0274] 3.1 Preparation of acetate-crosslinked RTV-1K silicone sealant using precipitated silica

[0275] The quantities required to prepare the following formulations are given in Table 2. During the preparation process, water should be mainly used for cooling so that the formulation does not experience a temperature rise significantly above room temperature. The preparation is carried out at room temperature and at a relative humidity of 40%-60%.

[0276] Add silicone polymer, plasticizer (silicone oil) to the assembly with sleeve, cooling water connection and independently controllable planet driven 2l stirring vessel and dissolver driven planetary dissolver (purchased from H. Linden, type LPMD2SP) And the crosslinking agent and the initial charge in 50min -1 (Planetary drive) and 500min -1 Homogenize for 1 minute at a speed of (dissolver drive). Then add the catalyst and place the batch in N 2 Use the same planet and dissolver drive speed to...

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Abstract

The present invention relates to a depositing silicon dioxide with special surface quality, method for preparing the same and its use for intensifier and thickener of encapsulant. The depositing silicon dioxide is characterized in that the absorbency ratio of its SiOH<separation> is above or equal to one.

Description

Technical field [0001] The invention relates to precipitated silicas with special surface quality, to their preparation method and to their use in thickening sealants. Background technique [0002] Sealants are elastic substances that are applied in liquid or highly viscous form to seal buildings or installations against water, atmospheric influences, or corrosive media. [0003] Silicone rubber is a composition that can be converted into an elastomer state and includes polydiorganosiloxane as their base polymer, the polydiorganosiloxane containing a group capable of undergoing a crosslinking reaction. Suitable such groups include the main H atom, OH group and vinyl group, which may be located at the end of the chain or may be introduced into the chain. Introducing fillers into this system as reinforcing agents, their nature and quantity significantly affect the mechanical and chemical behavior of vulcanized rubber. Silicone rubber can be colored by inorganic pigments. One disti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/113
Inventor C・潘茨H・奥布拉登R・阿勒迪泽K・梅尔M・鲁夫M・坎普夫M・肖尔茨D・库恩
Owner EVONIK OPERATIONS GMBH
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