Granular functionalized silica, process for preparation thereof and use thereof
The present invention relates to granular functionalized silicas, wherein the Hg pore volume (<4 μm) is more than 0.80 ml/g, d Q3=10% is more than 400 μm, d Q3=90% is less than 3000 μm, the ratio of d 50 without ultrasound exposure to d 50 after 3 min of ultrasound exposure is <4.00 and the carbon content is 1.0-15.0% by weight. The inventive granular functionalized silicas can be used as a support material, especially as a support for enzymes.
1. A granular functionalized silica comprising:
a Hg pore volume (<4 μm) of more than 0.80 ml/g,
d Q3 =10% of more than 400 μm,
d Q3 =90% of less than 3000 μm,
a ratio of d 50 without ultrasound exposure to d 50 after 3 min of ultrasound exposure is <4.00, a measurement being effected on a fraction of particles of 400 to 500 μm, and
a carbon content of 1.0-15.0% by weight;
wherein the granular functionalized silica is a precipitated silica, contains a surface modifier that is 3-aminopropyltriethoxysilane on a surface of the granular functionalized silica and contains an additive,
wherein the additive is bound to the granular functionalized silica, and
wherein the additive is released from the granular functionalized silica at least 10 times less with the surface modifier that is 3-aminopropyltriethoxysilane compared to the granular functionalized silica without the surface modifier.
2. The granular functionalized silica according to claim 1 , wherein the granular functionalized silica has a pH in a range from 5.0 to 11.0.
3. The granular functionalized silica according to claim 1 , wherein the granular functionalized silica has a ratio of d 50 without ultrasound exposure to d 50 after 3 min of ultrasound exposure of 1.00 to 3.00, a measurement being effected on a fraction of particles of 400 to 500 μm.
4. The granular functionalized silica according to claim 1 , wherein the granular functionalized silica has the Hg pore volume (<4 μm) of 0.81 to 1.50 ml/g.
5. The granular functionalized silica according to claim 1 , wherein the additive comprises hardening agents or initiators, crosslinking agents, catalysts, active pharmaceutical ingredients and excipients, active cosmetic ingredients and excipients, cleansing and/or care compositions, flavourings, aromas and fragrances, animal feeds or animal feed additives, vitamins, minerals, foods or food additives, dyes and/or pigments, amino acids, oxidizing or bleaching agents, additives with microbicidal action, chemicals for agriculture and forestry, and/or concrete admixtures.
6. The granular functionalized silica according to claim 1 , wherein the additive is an enzyme.