摘要:
A granular material having a high strength and a large BET specific surface area composed of porous particles comprising calcium oxide and calcium hydroxide wherein the calcium oxide is contained in an amount of 30 to 80 weight % based on a total amount of the calcium oxide and calcium hydroxide and the porous particles have a BET specific surface area of 40 m2/g or more, or composed of porous particles comprising calcium oxide, magnesium oxide, calcium hydroxide, and magnesium hydroxide wherein a ratio of an amount of magnesium to a total of an amount of calcium and an amount of magnesium is in the range of 0.05 to 0.80, a total hydroxide content in the whole particles is in the range of 1 to 20 weight % and the porous particles have a BET specific surface area of 50 m2/g or more.
摘要翻译:一种具有高强度和大的BET比表面积的颗粒材料,其由包含氧化钙和氢氧化钙的多孔颗粒组成,其中氧化钙的含量相对于氧化钙和钙的总量为30至80重量% 氢氧化物和多孔颗粒的BET比表面积为40m 2 / g以上,或由包含氧化钙,氧化镁,氢氧化钙和氢氧化镁的多孔颗粒组成,其中镁与总量的比例 钙的量和镁的量在0.05至0.80的范围内,整个颗粒中的总氢氧化物含量在1至20重量%的范围内,多孔颗粒的BET比表面积为50m 2 / g 或者更多。
摘要:
A granular material having a high strength and a large BET specific surface area composed of porous particles comprising calcium oxide and calcium hydroxide wherein the calcium oxide is contained in an amount of 30 to 80 weight % based on a total amount of the calcium oxide and calcium hydroxide and the porous particles have a BET specific surface area of 40 m2/g or more, or composed of porous particles comprising calcium oxide, magnesium oxide, calcium hydroxide, and magnesium hydroxide wherein a ratio of an amount of magnesium to a total of an amount of calcium and an amount of magnesium is in the range of 0.05 to 0.80, a total hydroxide content in the whole particles is in the range of 1 to 20 weight % and the porous particles have a BET specific surface area of 50 m2/g or more.
摘要翻译:一种具有高强度和大的BET比表面积的颗粒材料,其由包含氧化钙和氢氧化钙的多孔颗粒组成,其中氧化钙的含量相对于氧化钙和钙的总量为30至80重量% 氢氧化物和多孔颗粒的BET比表面积为40m 2 / g以上,或由包含氧化钙,氧化镁,氢氧化钙和氢氧化镁的多孔颗粒组成,其中镁与总量的比例 钙的量和镁的量在0.05至0.80的范围内,整个颗粒中的总氢氧化物含量在1至20重量%的范围内,多孔颗粒的BET比表面积为50m 2 / g 或者更多。
摘要:
A fine powder of an alkaline earth metal carbonate selected from the group consisting of barium carbonate, strontium carbonate and calcium carbonate, in which a primary particle of the powder has a mean diameter of 30 to 90 nm, in which the mean diameter is measured on a circle obtained from a projected area of the primary particle, and in which an accumulated volume of micropores having a pore size in the range of 10 to 20 nm is not less than 5×10−2 cm3/g can be easily dispersed in an aqueous medium in the form of essentially primary particles by an industrially employable dispersing method.
摘要翻译:选自碳酸钡,碳酸锶和碳酸钙的碱土金属碳酸盐的细粉末,其中粉末的初级颗粒的平均直径为30至90nm,其中平均直径在 从一次粒子的投影面积获得的圆,其中孔径在10〜20nm范围内的微细孔的累积体积不小于5×10 -2 cm 3 / g可以容易地分散在 水性介质,其基本上是初级粒子的形式,通过工业上可用的分散方法。
摘要:
A fine alkaline earth metal carbonate powder showing high dispersibility, in which the alkaline earth metal carbonate is selected from the group consisting of strontium carbonate and barium carbonate, can be prepared by a process comprising the steps of pulverizing a powder of strontium carbonate or barium carbonate in an aqueous medium using ceramic beads having a mean diameter of 10 to 1,000 μm in the presence of a polymer comprising a polycarboxylic acid or anhydride thereof having a side chain of a polyoxyalkylene group, and drying the pulverized powder.
摘要:
A fine powder of an alkaline earth metal carbonate selected from the group consisting of barium carbonate, strontium carbonate and calcium carbonate, in which a primary particle of the powder has a mean diameter of 30 to 90 nm, in which the mean diameter is measured on a circle obtained from a projected area of the primary particle, and in which an accumulated volume of micropores having a pore size in the range of 10 to 20 nm is not less than 5×10−2 cm3/g can be easily dispersed in an aqueous medium in the form of essentially primary particles by an industrially employable dispersing method.
摘要翻译:选自碳酸钡,碳酸锶和碳酸钙的碱土金属碳酸盐的细粉末,其中粉末的初级颗粒的平均直径为30至90nm,其中平均直径在 从一次粒子的投影面积获得的圆,其中孔径在10〜20nm范围内的微细孔的累积体积不小于5×10 -2 cm 3 / g可以容易地分散在 水性介质,其基本上是初级粒子的形式,通过工业上可用的分散方法。
摘要:
Fatty acid esters, which are prepared by reacting fats and oils with an alcohol in the absence of a catalyst under a condition under which at least one of the fats and oils and the alcohol is in a supercritical state, are useful as fuels such as diesel fuels, lubrication base oils or fuel additives.
摘要:
The silicone-based fiber finishing agent is particularly suitable for synthetic fiber-made fabric materials such as waddings of polyester fibers to impart excellent softness and smoothness in touch and free from yellowing even by heating with high resistance against dry cleaning. The fiber finishing agent comprises (A) an organopolysiloxane of a substantially linear molecular structure terminated at each molecular chain end with a silanolic hydroxy group or alkoxy group and having at least one amino-substituted hydrocarbon group bonded to the silicon atom in a molecule, (B) an epoxy-containing alkoxy silane compound such as methyl dimethoxy 3-glycidyloxypropyl silane and (C) an epoxy-containing organic compound free from silicon such as glycidyl alcohol and glycidyl methacrylate.
摘要:
The invention provides a method for protecting the surface of various kinds of shaped articles made of an organic polymeric material such as rubbers, leathers, woods, plastics and the like against weathering caused by exposure to ultraviolet light, ozone, moisture, etc. The method comprises providing the surface with a coating layer of a specific organopolysiloxane composed of difunctional, tetrafunctional and nonofunctional siloxane units in a limited molar proportion of 50-85%, 10-30% and 5-20%, respectively.
摘要:
Dispersibility of an alkaline earth metal carbonate micropowder in a polymer resin or in an organic solvent is improved by treating the surface of the alkaline earth metal micropowder with a surfactant having hydrophilic groups and hydrophobic groups and groups that form anions in water.
摘要:
A fine strontium carbonate powder having a BET specific surface area of 20 to 150 m2/g, which comprises spherical particles having a mean aspect ratio of 2.0 or less shows high dispersibility in liquid media and is of value for producing dielectric ceramic materials such as strontium titanate.