公开(公告)号：US3668119A

公开(公告)日：1972-06-06

申请号：US3668119D

申请日：1971-02-04

Applicant: DEGUSSA

Inventor： BAUER DIETRICH ,  FRATZSCHER HELMUT

IPC: C04B20/08 ,  B01D37/00

CPC classification number: C04B20/08

Abstract: A colloidal solution of Chrysotile asbestos which is obtained from a pre-purified aqueous suspension of crude Chrysotile asbestos by means of a shearing action is subjected to filtration or centrifuging to eliminate therefrom incompletely separated colloidal matter. Subsequently, the asbestos is precipitated from the refined solution and subjected to further processing.

Abstract translation: 通过剪切作用从预纯化的温石棉石棉水悬浮液中获得的温石棉的胶体溶液进行过滤或离心以除去未完全分离的胶体物质。 随后，石棉从精制溶液中沉淀出来并进行进一步处理。

公开(公告)号：DK160289A

公开(公告)日：1989-11-08

申请号：DK160289

申请日：1989-04-03

Applicant: DEGUSSA

Inventor： KERNER DIETER ,  WAGNER ADOLF ,  SCHMIDT FELIX ,  BAUER DIETRICH

IPC: C01B33/187 ,  C01B33/193 ,  C09C1/30 ,  C09C3/10 ,  C09C3/12 ,  C09D7/00 ,  C09D7/12

Abstract: The finely divided high-structure precipitated silica, which has a BET surface area (DIN 60132) of between 150 and 350 m /g a compacted bulk density (DIN 53194) of between 60 and 120 g/l a DBP number of between 3.0 and 4.0 ml/g a particle size distribution of at least 70 % of 1 to 6 mu m. It can be prepared by heating a mixture of water and sodium silicate to a temperature of 70 to 80 DEG C with stirring, metering into this mixture concentrated sulphuric acid until half of the alkali present is neutralised, treating the reaction mixture by means of a shearing unit and, if desired, simultaneously increasing the temperature to 86 +/- 5 DEG C, adding concentrated sulphuric acid after a period of 30 to 120 minutes at a higher speed until the pH of the silica suspension formed is 3.0 to 3.5, diluting, if desired, the silica suspension with water, separating off, if desired, the coarse portion by means of a centrifugal pump and a hydrocyclone, filtering off the silica using a known filtering device, washing the silica filter cake free of sulphate, redispersing the silica filter cake with the addition of water and using a stirrer to give a suspension having a solids content of 80 +/- 10 g/l, adding to this suspension, if desired, alkyldimethylbenzylammonium chloride, spray drying the suspension thus obtained and, if desired, milling the dried product. The precipitated silica can be used as matting agents in paints either in uncoated or coated form.

公开(公告)号：DK160289D0

公开(公告)日：1989-04-03

申请号：DK160289

申请日：1989-04-03

Applicant: DEGUSSA

Inventor： KERNER DIETER ,  WAGNER ADOLF ,  SCHMIDT FELIX ,  BAUER DIETRICH

IPC: C01B33/187 ,  C01B33/193 ,  C09C1/30 ,  C09C3/10 ,  C09C3/12 ,  C09D7/00 ,  C09D7/12

Abstract: The finely divided high-structure precipitated silica, which has a BET surface area (DIN 60132) of between 150 and 350 m /g a compacted bulk density (DIN 53194) of between 60 and 120 g/l a DBP number of between 3.0 and 4.0 ml/g a particle size distribution of at least 70 % of 1 to 6 mu m. It can be prepared by heating a mixture of water and sodium silicate to a temperature of 70 to 80 DEG C with stirring, metering into this mixture concentrated sulphuric acid until half of the alkali present is neutralised, treating the reaction mixture by means of a shearing unit and, if desired, simultaneously increasing the temperature to 86 +/- 5 DEG C, adding concentrated sulphuric acid after a period of 30 to 120 minutes at a higher speed until the pH of the silica suspension formed is 3.0 to 3.5, diluting, if desired, the silica suspension with water, separating off, if desired, the coarse portion by means of a centrifugal pump and a hydrocyclone, filtering off the silica using a known filtering device, washing the silica filter cake free of sulphate, redispersing the silica filter cake with the addition of water and using a stirrer to give a suspension having a solids content of 80 +/- 10 g/l, adding to this suspension, if desired, alkyldimethylbenzylammonium chloride, spray drying the suspension thus obtained and, if desired, milling the dried product. The precipitated silica can be used as matting agents in paints either in uncoated or coated form.

公开(公告)号：ZA892021B

公开(公告)日：1989-11-29

申请号：ZA892021

申请日：1989-03-16

Applicant: DEGUSSA

Inventor： DIETER KERNER ,  KERNER DIETER ,  WAGNER ADOLF ,  DIETRICH BAUER ,  ADOLF WAGNER ,  SCHMIDT FELIX ,  BAUER DIETRICH ,  FELIX SCHMIDT

IPC: C01B33/193 ,  C09C1/30 ,  C09C3/10 ,  C01B33/187 ,  C09C3/12 ,  C09D7/00 ,  C09D7/12 ,  C01B ,  C09C ,  C09D

Abstract: The finely divided high-structure precipitated silica, which has a BET surface area (DIN 60132) of between 150 and 350 m /g a compacted bulk density (DIN 53194) of between 60 and 120 g/l a DBP number of between 3.0 and 4.0 ml/g a particle size distribution of at least 70 % of 1 to 6 mu m. It can be prepared by heating a mixture of water and sodium silicate to a temperature of 70 to 80 DEG C with stirring, metering into this mixture concentrated sulphuric acid until half of the alkali present is neutralised, treating the reaction mixture by means of a shearing unit and, if desired, simultaneously increasing the temperature to 86 +/- 5 DEG C, adding concentrated sulphuric acid after a period of 30 to 120 minutes at a higher speed until the pH of the silica suspension formed is 3.0 to 3.5, diluting, if desired, the silica suspension with water, separating off, if desired, the coarse portion by means of a centrifugal pump and a hydrocyclone, filtering off the silica using a known filtering device, washing the silica filter cake free of sulphate, redispersing the silica filter cake with the addition of water and using a stirrer to give a suspension having a solids content of 80 +/- 10 g/l, adding to this suspension, if desired, alkyldimethylbenzylammonium chloride, spray drying the suspension thus obtained and, if desired, milling the dried product. The precipitated silica can be used as matting agents in paints either in uncoated or coated form.

公开(公告)号：ZA8902021B

公开(公告)日：1989-11-29

申请号：ZA8902021

申请日：1989-03-16

Applicant: DEGUSSA

Inventor： KERNER DIETER ,  DIETER KERNER ,  WAGNER ADOLF ,  ADOLF WAGNER ,  SCHMIDT FELIX ,  FELIX SCHMIDT ,  BAUER DIETRICH ,  DIETRICH BAUER

IPC: C01B33/187 ,  C01B33/193 ,  C09C1/30 ,  C09D7/00 ,  C01B ,  C09C ,  C09D

CPC classification number: C09C1/30 ,  C01B33/193 ,  C01P2004/51 ,  C01P2004/61 ,  C01P2006/10 ,  C01P2006/11 ,  C01P2006/12 ,  C01P2006/19 ,  C01P2006/82 ,  C09C1/3027 ,  C09D7/42

Abstract: The finely divided high-structure precipitated silica, which has a… BET surface area (DIN 60132) of between 150 and 350 m /g… a compacted bulk density (DIN 53194) of between 60 and 120 g/l… a DBP number of between 3.0 and 4.0 ml/g… a particle size distribution of at least 70 % of 1 to 6 mu m. … It can be prepared by heating a mixture of water and sodium silicate to a temperature of 70 to 80 DEG C with stirring, metering into this mixture concentrated sulphuric acid until half of the alkali present is neutralised, treating the reaction mixture by means of a shearing unit and, if desired, simultaneously increasing the temperature to 86 +/- 5 DEG C, adding concentrated sulphuric acid after a period of 30 to 120 minutes at a higher speed until the pH of the silica suspension formed is 3.0 to 3.5, diluting, if desired, the silica suspension with water, separating off, if desired, the coarse portion by means of a centrifugal pump and a hydrocyclone, filtering off the silica using a known filtering device, washing the silica filter cake free of sulphate, redispersing the silica filter cake with the addition of water and using a stirrer to give a suspension having a solids content of 80 +/- 10 g/l, adding to this suspension, if desired, alkyldimethylbenzylammonium chloride, spray drying the suspension thus obtained and, if desired, milling the dried product. … The precipitated silica can be used as matting agents in paints either in uncoated or coated form.

公开(公告)号：CA946104A

公开(公告)日：1974-04-30

申请号：CA104602

申请日：1971-02-05

Applicant: DEGUSSA

Inventor： BAUER DIETRICH ,  FRATZSCHER HELMUT

IPC: C04B20/08

Abstract: A colloidal solution of Chrysotile asbestos which is obtained from a pre-purified aqueous suspension of crude Chrysotile asbestos by means of a shearing action is subjected to filtration or centrifuging to eliminate therefrom incompletely separated colloidal matter. Subsequently, the asbestos is precipitated from the refined solution and subjected to further processing.