摘要:
In the production of an .alpha.-iron oxide pigment by the hydrothermal treatment of a trivalent iron-containing solution or suspension, the improvement which comprises adding to the solution or suspension prior to the hydrothermal treatment active .alpha.-iron oxide seeds with lamellar or disc-like crystal form and a specific surface of at least 10 m.sup.2 /g, whereby the resulting pigment is lamellar with an Fe.sub.2 O.sub.3 content of at least 88%, an average particle diameter of from 0.5 to 20 .mu.m, an average ratio of diameter to thickness of from 20 to 100, and an almost normally distributed particle size distribution, the relative standard deviation of which, based on the average value of the normal distribution, is less than 0.3. The product has superior coloring properties and is used as a precursor compound for the production of lamellar magnetic pigments with superior magnetic properties.
摘要翻译:在通过水热处理三价含铁溶液或悬浮液生产α-氧化锡颜料时,其改进包括在水热处理之前向溶液或悬浮液中加入具有层状或盘状的活性α-氧化铁种子, 并且比表面积为至少10m 2 / g,由此得到的颜料是Fe 2 O 3含量至少为88%,平均粒径为0.5至20μm的平均粒径,直径与厚度的平均比 为20〜100,且基于正态分布的平均值的相对标准偏差小于0.3的几乎通常分布的粒度分布。 该产品具有优异的着色性能,并用作制备具有优异磁性的层状磁性颜料的前体化合物。
摘要:
The invention relates to a process for the production of sulphonic acid ester group-containing polyhydroxyl compounds having an average hydroxyl functionality of from 1.5 to 4, comprising reacting(a) paraffin sulphochlorides which are obtained by sulphochlorination of paraffins containing from 10 to 18 carbon atoms or of industrial mixtures of these paraffins, with unreacted paraffins and/or with chloroparaffins, having saponifiable chlorine content, based on the total weight of component (a), of from 5 to 15% with(b) an alcohol which is at least trihydric and which contains primary and/or secondary hydroxyl groups within the molecular weight range of from 92 to 250 or with mixtures of polyhydric alcohols having a molecular weight in the range of from 62 to 250 with an average hydroxyl functionality of from 2.5 to 5in the presence of hydrogen chloride acceptors while maintaining an equivalent ratio of hydroxyl groups to sulphochloride groups of at least 2:1 with the optional removal of sulphochloride group-free paraffin and/or chloroparaffin and excess alcohol from the reaction mixture after the reaction.
摘要:
Hardenable mixtures ofA. 40 to 90% by weight of at least one aromatic polyfunctional cyanic acid ester,B. 10 to 60% by weight of at least one polymerizable olefinically unsaturated monomer and, optionally,C. 0.01 to 10% by weight, based on the sum of A) and B) of at least one hardening catalyst such as amines, Mannich bases and organic metal compounds. They are suitable for use as casting resins and as pourable sealing compounds for covering materials, for producing shaped articles, coatings, bonds, electrical insulations, as binders for fibre-reinforced plastics.
摘要:
This invention relates to storage stable resin reaction mixtures obtained by mixing at least one organic polyisocyanate, at least one organic compound containing at least two epoxide groups, at least one alkylating agent that inhibits the reaction of the polyisocyanate and epoxide components, and optional auxiliary agents and additives. The present invention further relates to a process for the preparation of such reaction mixtures and to their use.
摘要:
Iron oxide particles containing at least 5% by weight of iron (II) content calculated as FeO are stabilized against atmospheric oxidation by a coating of at least one compound containing boron and those particles are useful as coloring pigments and magnetic particles in magnetic recording media.
摘要:
Coated rutile mixed phase pigments comprise a mixed phase rutile pigment having a first coating of an oxide or hydrated oxide of titanium, zirconium, tin or a mixture thereof and a subsequent coating of an oxide or hydroxide of aluminum, and those pigments exhibit an improved tendency against flocculation in lacquers hardened with acid catalysts.
摘要:
In the production of a gypsum-based porous body of high strength by foaming a gypsum-water mixture, the improvement which comprises including in said mixture about 0.1 to 1 part of a water-soluble aluminum compound per 100 parts by weight of gypsum, calcium oxide or calcium hydroxide in such a quantity that the final mixture has a pH-value in the range of about 10 to 13, a decomposition catalyst, and about 0.5 to 5 parts of hydrogen peroxide, expressed as a 35% solution, per 100 parts by weight of mixture, the ratio of solids to liquid being about 1 : 0.4 - 1.The preferred aluminum compound is aluminum nitrate. The preferred decomposition catalysts are manganese compounds such as manganates or permanganates, e.g. potassium permanganate.
摘要:
The present invention directed to an at least substantially pore-free polyurethane prepared by reacting at least one polyisocyanate and a component containing a partial carboxylic acid ester which is the reaction product of a carboxylic acid and an at least trihydric alcohol in quantities such that at least one of the hydroxyl groups of said alcohol is not esterified.
摘要:
This invention relates to heat-hardenable epoxide resin mixtures of at least one 1,2-polyepoxide having more than one 1,2-epoxide group per molecule, at least one cyclic carboxylic acid anhydride and at least one ammonium phosphonate or ammonium phosphate as a hardening catalyst, as well as further optional auxiliaries.
摘要:
A bismuth oxide/chromium oxide mixed phase pigment having the composition Bi.sub.2-x Cr.sub.x O.sub.3 wherein 0.05.times.0.5 and a specification surface of about 1.0 to 10 m.sup.2 /g is produced by mixing metallic bismuth intensively with a chromium (III) and/or chromium (VI) compound, calcining the homogeneous mixture in an oxidizing atmosphere at a temperature of about 500.degree. to 800.degree. C., and crushing the product to pigment size.
摘要翻译:通过将金属铋浓缩地与铬(III)和/或铬(III)混合来制备具有组成为Bi 2-x Cr x O 3的氧化铋/氧化铬混合相颜料,其中0.05x0.5和规格表面为约1.0-10m2 / g VI)化合物,在约500-800℃的温度下在氧化气氛中煅烧均匀混合物,并将产物粉碎成颜料尺寸。