摘要:
There is provided a method for producing an acrylic resin-coated silica particle dispersion that has excellent storage stability, and that when added to a coating material produces a coating film with excellent mar resistance. The method for producing an acrylic resin-coated silica particle dispersion of the invention comprises the following steps 1 to 3. Step 1: A step of mixing and heating silica particles (A), an organic solvent (B) and a monomer having a polymerizable unsaturated group and a hydrolyzable silyl group (C) to obtain a polymerizable unsaturated group-containing silica particle dispersion (i). Step 2: A step of adding a tertiary amine (D) with a molecular weight of 120 to 380 and having a terminal alkyl and/or aryl group, to the component (i) dispersion, to obtain a polymerizable unsaturated group-containing silica particle dispersion (ii). Step 3: A step of reacting the component (ii) dispersion with a polymerizable unsaturated monomer (E), in a solid mass ratio of (ii):(E) = 20:80 to 90:10, to obtain an acrylic resin-coated silica particle dispersion.
摘要:
The invention relates to a process for the preparation of a novel precipitated silica, wherein: a silicate is reacted with an acidifying agent, so as to obtain a silica suspension; said silica suspension is filtered, so as to obtain a filter cake; said filter cake is subjected to a liquefaction operation, in the absence of an aluminium compound; wherein methylglutaric acid is added to the filter cake, during or after the liquefaction operation. It also relates to novel precipitated silicas and to their uses.
摘要:
A porous silica particle with the small specific surface area and large pore volume, which is contained as the scrubbing agent in the cleansing cosmetics is provided. The porous silica particle has high collapsibility, and therefore the damage of the skin can be prevented. A porous silica particle according to the present invention has: an average circularity of 0.1 to 0.5; a pore volume (Pv) of 0.1 ‰¤ Pv
摘要翻译:提供一种在清洁化妆品中作为洗涤剂含有的具有小比表面积和大孔体积的多孔二氧化硅颗粒。 多孔二氧化硅颗粒具有高的湿陷性,因此可以防止皮肤的损伤。 根据本发明的多孔二氧化硅颗粒具有:0.1至0.5的平均圆形度; 孔体积(Pv)为0.1‰¤Pv <1.0 ml / g; 比表面积为5〜60m 2 / cm 3; 中值尺寸(D50)为100至1000μm; 最大粒径(D100)与中值粒径(D50)之比(D100 / D50)为3.0以下; 并且在1.0至1.4KPa的载荷下摩擦30秒后,中值粒径(DR50)为5至40μm,最大粒径(DR100)为15至200μm。
摘要:
The invention relates to a method of making paper or paperboard comprising the steps of; a. providing a stock suspension; b. adding a mixture of alkali-metal silicate and precipitated calcium carbonate to said stock suspension; c. adding an acidic media to said stock suspension substantially directly before and/or after step (b) d. forming a web of the stock suspension obtained in step (d) e. drying said web. The addition of a mixture of alkali-metal silicate and PCC and of an acidic media to the stock suspension in accordance with the invention improves the bonding between the fibers and the filler (PCC), whereby problems related to dusting is decreased. Moreover, the method enables the addition of a higher amount of fillers to the paper without substantially affecting the strength.
摘要:
The disclosure provides a process for making hollow inorganic particles comprising: providing a recyclable template particle in an aqueous dispersion, wherein the recyclable template particle is prepared from an organic monomer; coating the recyclable template particle with a water-based silica precursor; maintaining the pH at about 2 to about 10 to form core/shell particles comprising a silica treatment on the recyclable template particle; removing the core/shell particles; and removing the recyclable template particle from the core/shell particles to form a hollow silica particle.
摘要:
A precipitated silica having a CTAB specific surface in the range of from 50 to 300 m2/g; a BET/CTAB specific surface ratio equal to or greater than 1.3 and comprising at least one polycarboxylic acid.
摘要:
The invention relates to a process for the preparation of a modified silica comprising the step of adsorbing at least one polycarboxylic acid on precipitated silica.