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Surface modified silicic acid semi-gels

A surface modification, semi-gel technology, applied in fibrous fillers, coatings, paper coatings, etc., can solve the problems of coating peeling, coating performance damage, re-destruction, etc., to achieve the effect of good connection

Inactive Publication Date: 2011-04-27
EVONIK DEGUSSA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, surface modification poses some problems
For example, commercially available surface-modified matting agents often have the disadvantage that the coating can detach during storage of the paint and thus at least partially destroy the desired effect again
This can lead to damage to coating performance

Method used

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  • Surface modified silicic acid semi-gels
  • Surface modified silicic acid semi-gels
  • Surface modified silicic acid semi-gels

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0226] Semigel SD 500 with the following physical-chemical data according to Table 2, Beijing Aerospace Saide Powder Material Technology Co., Ltd., No. 16 Yuquan Road, Haidian District, Beijing, China, was carried out as follows by means of an AFG 50 jet mill from Alpine Corporation Grinding, and simultaneously coating with a suspension consisting of 50% by weight organopolysiloxane TegoRad 2300 and 50% by weight ethanol:

[0227] Rotation number of sorter: 15000 rpm

[0228] Sorting air: 30Nm 3 / h

[0229] Grinding pressure: 4 bar

[0230] PID blower: 51%

[0231] Total Air: 82Nm 3 / h

[0232] Material throughput: 0.57kg SiO2 / h

[0233] Grinding time: 80 minutes

[0234] The product was then dried in a drying oven at 80 °C for 2.5 h.

[0235] The addition of the TegoRad 2300 suspension was carried out such that a surface-modified semi-gel with the physico-chemical properties indicated in Table 2 was finally obtained.

Embodiment 2

[0237] Semi-gel SD 600 with the physico-chemical data shown in Table 2, Beijing Aerospace Saide Powder Material Technology Co., Ltd., No. 16 Yuquan Road, Haidian District, Beijing, China, was ground as follows by means of an AFG 50 jet mill from Alpine Corporation , and simultaneously coated with a suspension consisting of 50% by weight organopolysiloxane TegoRad 2300 and 50% by weight ethanol:

[0238] Rotation number of sorter: 15000 rpm

[0239] Sorting air: 30Nm 3 / h

[0240] Grinding pressure: 4 bar

[0241] PID blower: 51%

[0242] Total air: 79Nm 3 / h

[0243] Material throughput: 0.75kg SiO2 / h

[0244] Grinding time: 80 minutes

[0245] The product was then dried in a drying oven at 80 °C for 2.5 h.

[0246] The addition of the TegoRad 2300 suspension was carried out such that a surface-modified semi-gel with the physico-chemical properties indicated in Table 2 was finally obtained.

[0247] Table 2: Physicochemical properties of reactants and products of Ex...

Embodiment 4

[0254] Testing of the paint technical performance of the semi-gels according to the invention in black paint

[0255] As black paint, Duplex D 1326 from the company DuPont (produced by Herberts Austria GmbH) was used. In each case 5.5 g of matting agent were incorporated. 1

[0256] The 60° and 85° reflectometer values ​​are determined according to DIN 67530, ISO 2813 or TM 523-78, and the flat gloss (=85° reflectometer value−60° reflectometer value) is calculated (see Table 3). This flat gloss allows evaluation of the matting effect of the surface at various viewing angles. A lower matte gloss means that the surface appears matte at all viewing angles of the surface.

[0257] Table 3: Black paint

[0258] SiO of the following examples 2

[0259] The data in Table 3 show that, particularly in view of the gloss values ​​at 85°, the matting efficiency of the surface-modified semi-gels according to the invention is comparable to that of precipitation method II tre...

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Abstract

The invention provides a surface modified silicic acid semi-gels so disposed that at least part of the surface of the silicic acid semi-gels is modified by at least one kind of organoalkoxysilane and / or at least one kind of modified organoalkoxysilane. The invention also provides a method for preparing the surface modified silicic acid semi-gels. The surface modified silicic acid semi-gels of the invention can serve as matting agent in paint and fining varnish, component in coated sheets, preparation agent in defoaming agent, and enhancing agent in silicone rubber and / or anti-acaking agent in plastic application. In addiction, the invention includes varnishes preparing agent of surface modified silicic acid semi-gels.

Description

technical field [0001] The present invention relates to new surface-modified semi-gels, their preparation and their use. Background technique [0002] Based on SiO 2 Inorganic oxides are classified into fumed silica due to their preparation method and their properties (silica aerogels), precipitated silica, silica sols, silica gels (silica gels) and semi-gels. [0003] In silica gel, it is divided into hydrogel, aerogel and xerogel. Hydrogel (Hydrogele) - or also known as Hydrogel (Aquagele) is prepared in water so that its pores are filled with water. A xerogel is a hydrogel after water has been removed therefrom. Aerogels are xerogels from which the liquid is removed such that the gel structure undergoes only minimal changes and the pore volume is largely preserved. [0004] Silica gels have been known for a long time (Iler, "Chemistry of Silica", p. 462 ff., 1979). They are prepared under conditions that promote the co-growth of primary particles (with an average p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/12C08K9/06C08K3/36C08L83/04D21H19/00C09C1/28C09C3/12C09D7/42
CPCC09D7/005C09C1/3081C01P2006/17C01P2006/16C01P2006/14C01P2006/12C09D7/42C09D7/70Y10T428/249991Y10T428/249979C01B33/14
Inventor G·G·林德纳H·D·克里斯汀
Owner EVONIK DEGUSSA GMBH
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