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    FINELY DIVIDED DIVIDED PRECIPITATED SILICA HAVING A HIGH STRUCTURE, PROCESS FOR PRODUCING SAME AND ITS USE
    1.
    发明专利
    FINELY DIVIDED DIVIDED PRECIPITATED SILICA HAVING A HIGH STRUCTURE, PROCESS FOR PRODUCING SAME AND ITS USE 未知

    公开(公告)号：CA1340129C

    公开(公告)日：1998-11-17

    申请号：CA598876

    申请日：1989-05-05

    Applicant: DEGUSSA

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

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

    Abstract: A finely divided precipitated silica having a structure with a BET surface area (DIN 60132) of between 150 and 350 sq.m/g, tamped density (DIN 53194) of between 60 and 120 g/litre, DBP number of between 3.0 and 4.0 ml/g and particle size distribution of at least 70% of 1 to 6 .mu.m. It can be produced by heating a mixture of water and sodium silicate to a temperature of 70 to 80.degree.C while stirring by metered addition of concentrated sulphuric acid until one half of the alkali present is neutralized, by treating the reaction mixture with a shear unit while simultaneously increasing the temperature to 86~5.degree.C, when required, by adding concentrated sulphuric acid at a higher rate during a period of 30 to 120 minutes until the pH value of the nascent silica suspension is 3.0 to 3.5, by diluting the silica suspension, when required, by separating the coarse fraction by means of a centrifugal pump or of a hydrocyclone, by filtering off the silica by means of conventional filtering devices, by washing the silica filter cake until it is free from sulphate, by redispersing the silica filter cake by adding water by means of an agitator unit so as to obtain a suspension having a content of solids of 80~10 g per litre, adding, when required, alkyl dimethyl benzyl-ammonium chloride to this suspension and spray-drying the suspension thus obtained and, when required, grinding the dried product. The precipitated silica, either uncoated or coated, can be used as a dulling agent in varnishes.

    2.
    发明专利
    未知

    公开(公告)号：ES2033473T5

    公开(公告)日：1997-03-16

    申请号：ES89103046

    申请日：1989-02-22

    Applicant: DEGUSSA

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

    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.

    3.
    发明专利
    未知

    公开(公告)号：DE58901670D1

    公开(公告)日：1992-07-23

    申请号：DE58901670

    申请日：1989-02-22

    Applicant: DEGUSSA

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

    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.

    8.
    发明专利
    未知

    公开(公告)号：DE3815670A1

    公开(公告)日：1990-01-25

    申请号：DE3815670

    申请日：1988-05-07

    Applicant: DEGUSSA

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

    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.

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