公开(公告)号：US20190119161A1

公开(公告)日：2019-04-25

申请号：US16094557

申请日：2017-04-07

Applicant: BASF SE

Inventor： Radoslaw KIERAT ,  Michael Klemens MUELLER ,  Andreas KEMPTER ,  Oscar LAFUENTE CERDA ,  Kai BERGNER

IPC: C04B20/10 ,  C04B28/02 ,  C04B22/06 ,  C04B40/06

Abstract: The invention relates to a process for preparing silica-coated particles of an inorganic expanding agent, the silica-coated particles and their use. The silica-coated particles show a delayed release of the expanding agent particularly in alkaline medium and at elevated temperatures. They are therefore useful in the oil and construction industry.

公开(公告)号：US20200299202A1

公开(公告)日：2020-09-24

申请号：US16755365

申请日：2018-09-25

Applicant: BASF SE

Inventor： Sung Yeun CHOI ,  Kai BERGNER ,  Radoslaw KIERAT ,  Michael Klemens MUELLER

IPC: C04B38/02 ,  C04B20/10 ,  C04B18/02

Abstract: Coated inorganic expanding agent particles comprise a core of an inorganic expanding agent and a sol/gel-formed coating comprising a mixed oxide of two or more metals and/or metalloids, in particular a mixed oxide of silicon and at least one metal and/or metalloid selected from aluminum, boron, titanium, zirconium and zinc. The coated inorganic expanding agent particles are added to cementitious systems to avoid shrinkage during hardening. The coating is effective to delay the expanding effect.