公开(公告)号：DE59000043D1

公开(公告)日：1992-03-26

申请号：DE59000043

申请日：1990-04-30

Applicant: BASF AG

Inventor： WOLFF BERNARDO DR ,  MIELKE MANFRED ,  SEYBOLD GUENTHER DR ,  OSTERTAG WERNER DR ,  FRICKE JOCHEN PROF DR ,  CAPS ROLAND DR

IPC: C01B33/155 ,  C01B33/158 ,  C04B14/06 ,  C04B30/00 ,  F16L59/00 ,  F16L59/02 ,  F16L59/08

Abstract: The material is obtainable by a) reacting an aqueous dispersion of waterglass and a pigment with a strong acid and/or waterglass with a pigment-containing strong acid to give a pigment-containing silica hydrogel, the pigment being characterised in that it scatters, absorbs or reflects infrared radiation of wavelength 3 - 10 mu m, b) substantially freeing the pigment-containing silica hydrogel thus obtained from ionic constituents by washing out with water, c) displacing the water present in the hydrogel by means of a low- boiling liquid which is inert to the pigment-containing silica gel, d) heating the liquid-containing silica gel thus obtained with complete covering with the liquid to supercritical conditions and e) subsequently removing the liquid from the solid by flash evaporation at supercritical temperature.

公开(公告)号：DE3914850A1

公开(公告)日：1990-11-08

申请号：DE3914850

申请日：1989-05-05

Applicant: BASF AG

Inventor： WOLFF BERNARDO DR ,  MIELKE MANFRED ,  SEYBOLD GUENTHER DR ,  OSTERTAG WERNER DR ,  FRICKE JOCHEN PROF DR ,  CAPS ROLAND DR

IPC: C01B33/155 ,  C01B33/158 ,  C04B14/06 ,  C04B30/00 ,  F16L59/00 ,  F16L59/02 ,  F16L59/08

Abstract: The material is obtainable by a) reacting an aqueous dispersion of waterglass and a pigment with a strong acid and/or waterglass with a pigment-containing strong acid to give a pigment-containing silica hydrogel, the pigment being characterised in that it scatters, absorbs or reflects infrared radiation of wavelength 3 - 10 mu m, b) substantially freeing the pigment-containing silica hydrogel thus obtained from ionic constituents by washing out with water, c) displacing the water present in the hydrogel by means of a low- boiling liquid which is inert to the pigment-containing silica gel, d) heating the liquid-containing silica gel thus obtained with complete covering with the liquid to supercritical conditions and e) subsequently removing the liquid from the solid by flash evaporation at supercritical temperature.