540 results about "Chromium Compounds" patented technology

The present invention provides a novel method for producing a compound represented by formula (III) shown below, which comprises treating a compound represented by formula (I) shown below with a trivalent chromium compound and at least one kind of metal selected from the group consisting of manganese and zinc in a solvent in the presence of a ligand represented by formula (II) shown below, and the present invention further provides the novel compound represented by formula (I).

The present invention relates to a catalyst composition for ethylene oligomerization and the use thereof. Such catalyst composition includes chromium compound, ligand containing P and N, activator and accelerator; wherein the chromium compound is selected from the group consisting of acetyl acetone chromium, THF-chromium chloride and/or Cr(2-ethylhecanoate)₃; general formula of the ligand containing P and N is shown as:

in which R₁, R₂, R₃ and R₄ are phenyl, benzyl, or naphthyl. R₅ is isopropyl, butyl, cyclopropyl, cyclopentyl, cyclohexyl or fluorenyl; the activatior is methyl aluminoxane, ethyl aluminoxane, propyl aluminoxane and/or butyl aluminoxane; general formula of the accelerator is X₁R₆X₂, in which X₁ and X₂ are F, Cl, Br, I or alkoxyl, R₆ is alkyl or aryl; the molar ratio of a, b, c and d is 1:0.5˜10:50˜3000:0.5˜10. After mixing the four components mentioned previously under nitrogen atmosphere for 10 minutes, they are incorporated to the reactor, or these four components are incorporated directly into the reactor. Then ethylene is introduced for oligomerization. Such catalyst can be used in producing 1-octene through ethylene oligomerization. It is advantageous in high catalysing activity, high 1-octene selectivity, etc. The catalytic activity is more than 1.0×10⁶ g product·mol⁻¹ Cr ·h⁻¹, the fraction of C₈ linear α-olefin is more than 70% by mass.

The invention discloses a sodium chloride-free environment-friendly coal-saving combustion improver special for cement, which aims to solve the technical problem of eliminating the damage of sodium chloride to furnaces, kiln bodies and the atmosphere. The combustion improver consists of an industrial grade finished product raw material, industrial residue, and a tailing material, and contains a barium compound, boride, carbonate, a chromium compound, fluoride, a magnesium compound, a manganese compound, nitride, a molybdenum compound II, a zirconium compound, industrial residue or tailings of rare earth, oxide and dicyclopentadienyl iron. Compared with the prior art, the combustion improver completely cancels the sodium chloride, furthest reduces the content of Cl<-> in ingredients, eliminates the damage of the sodium chloride to the furnaces, the kiln bodies and the atmosphere, reduces the damage of causing acid rain to the atmosphere, increases a plurality of metal acids, oxygen compounds and rare earth minerals, contains waste residue, ensures that the combustion is controllably performed, improves combustion environment, improves the combustion efficiency of fire coal, reduces energy consumption, prolongs the service life of equipment, and protects the environment.

The invention relates to a catalyst system for the selective trimerisation of olefins, which system is based on a titanium complex of formula (Cp-B(R)nAr)TiR<1>3, wherein: Cp is a cyclopentadienyl type ligand, optionally substituted, B is a bridging group, based on a single atom selected from the groups 13 to 16 inclusive of the Periodic System, Ar is a aromatic group, optionally substituted, R is, independently, hydrogen, or a hydrocarbon residue, optionally being substituted and optionally containing heteroatoms, or groups R and B are joined together to form a ring, n is an integer equal to the (valency of B minus 2), and R<1 >is a mono-anionic group, and further comprises an activator. The present catalyst system obviates the use of toxic chromium compounds.

A light-shielding film for exposure light is formed on one principal plane of a transparent substrate made of quartz or the like that serves as a photomask substrate. The light-shielding film can serve not only as the so-called “light-shielding film” but also as an anti-reflection film. In addition, the light-shielding film has a total thickness of 100 nm or less, 70% or more of which is accounted for by the thickness of a chromium compound that has an optical density (OD) per unit thickness of 0.025 nm⁻¹ for light having a wavelength of 450 nm. In the case where the photomask blank is used for fabricating a mask designed for ArF exposure, the thickness and composition of the light-shielding film are selected in such a manner that the OD of the light-shielding film is 1.2 to 2.3 for 193 or 248 nm wavelength light.

The invention relates to a waterborne acrylic acid modified epoxy ester emulsion, the synthetic formula of which consists of the following components (by weight percentage): 12%-17% of epoxy resin; 14%-19% of unsaturated fatty acid; 4%-6% of a (methyl) acrylic ester or vinyl monomer; 2%-4% of methacrylic acid; 0.1%-0.5% of an initiator; 4%-6% of a cosolvent; 1.5%-2.5% of a neutralizing agent; and 45%-55% of deionized water. The waterborne epoxy ester amino baking varnish based on the waterborne acrylic acid modified epoxy ester emulsion involved in the invention adopts water as the diluent, takes the pigment and filler that both are free of harmful lead or chromium compound, has no risk of combustion, explosion, poisoning and environmental pollution, and is safe and environment friendly. The amino baking varnish can employ brush coating, spray coating, dip coating and other construction methods.

The invention provides a high-selectivity catalyst system used in trimerization and tetramerization of ethylene and a use method thereof. The catalyst system includes three components: (1) a chromium compound, (2) a ligand, of which a general structure formula is (Ph2)P-N(R1)-P(Ph2), wherein R1 is a synthetic phenyl group, alkyl group or cycloalkyl group; and (3) an activating agent or a co-catalyst. According to the catalyst system, a conventional PNP chromium-series catalyst is improved so that a co-selectivity of 1-hexane and 1-octylene is increased, wax-like products are reduced and a high activity is maintained.

Pretreated aluminum and aluminum alloys and the process and composition for pretreating said aluminum and its alloys to provide a coating with color recognition for identification purposes and to improved the corrosion-resistance, electrical conductivity, and adhesion properties which comprises pretreating said aluminum and its alloys with an effective amount of an acidic aqueous solution having a pH ranging from about 2.5 to 5.5 comprising water soluble trivalent chromium compounds, alkali metal hexafluorozirconates, divalent zinc compounds, alkali metal fluoro-compounds, and effective amounts of water soluble thickeners, surfactants or wetting agents.

Aqueous compositions for post-treating metal coated substrates such as cadmium-plated steel, and zinc-nickel coated substrates and the process for using said compositions to provide a color recognizable coating and to improve the corrosion-resistance, abrasion, electrical, and adhesion properties of the coating. The post-treatment composition comprises an acidic aqueous solution having a pH ranging from about 2.5 to 5.5 and contains effective amounts of trivalent chromium compounds, alkali metal hexafluorozirconates, at least one divalent zinc compound, alkali metal fluoro-compounds, and effective amounts of water soluble thickeners, wetting agents or surfactants.

The present invention relates to one kind of water soluble acrylic acid modified antirust epoxy resin paint. The modified antirust epoxy resin paint includes water soluble acrylic acid modified epoxy resin 45.0-62.0 wt%, water soluble amino resin 3.0-6.0 wt%, coloring pigment 5.0-15.0 wt%, antirust pigment 6.0-10.0 wt% and stuffing 5.0-10.0 wt%, and it contains also neutralizing agent, co-solvent, dispersant, defoaming agent, thickener, corrosion inhibitor, drying promoter and deionized water. The modified antirust epoxy resin paint contains no organic solvent and harmful lead and chromium compound, has no hazard of burning, explosion, poisoning and polluting environment, and has excellent protecting performance and decoration effect.

The invention discloses a preparation method of a nano-structure WC-Co composite powder, and belongs to the field of an alloy preparation method. The method comprises the following steps in sequence: adding a carbonic powder material which is excessive to tungsten, vanadium and chromium carbides into water-soluble saturated mixed aqueous solution of tungsten-containing compound, cobalt-containing compound, chromium-containing compound and vanadium-containing compound to adsorb the saturated composite salt solution; dehydrating and drying to form a nano-scale composite salt thin layer on the surface of the carbonic powder material; removing crystal water out of the composite salt at the temperature below 500 DEG C under a condition of isolating air, and decomposing the composite salt into composite oxide of tungsten oxide, chromium hemitrioxide, vanadium oxide and cobalt oxide, further heating, and reducing and carbonizing the composite oxide on the surface of the carbonic powder material to generate the WC-Co nano-structure composite powder at the temperature below 850 DEG C. The preparation is a simpler and more reliable novel preparation method of the nano WC-Co composite powder by a direct carbonization method.

The invention provides a trivalent chromium surface treatment agent and a zinc-plating material. The surface treatment agent is obtained by evenly mixing a raw mix; the raw mix comprises a first organic film former, a second organic film former and water; the first organic film former is a styrene-acrylic emulsion and/or a silicone-acrylic emulsion; and the second organic film former is a fluorocarbon emulsion and/or fluoro-silicon emulsion. The trivalent chromium surface treatment agent is characterized in that the raw mix also comprises a trivalent chromium compound and phosphate. The zinc-plating material provided by the invention comprises a zinc-plating base material and a coating adhering to the zinc-plating base material, and is characterized in that the coating is a solid product of the surface treatment agent. The coating obtained by solidifying the surface treatment agent provided by the invention has excellent corrosion resistance at high temperature or under the condition of being treated at high temperature. Moreover, trivalent chromium in the coating cannot be converted into hexavalent chromium, and thereby, the environmental-protection requirement is completely met.

The invention discloses a fluorination catalyst, and a preparation method and a use thereof, and belongs to the field of chemical synthesis. The precursor of the catalyst is formed by blending 40-95mass% of a trivalent chromium compound with 5-60mass% of tungstate, wherein the trivalent chromium compound can be chromic oxide or chromium hydroxide, and the tungstate can be zinc tungstate, nickel tungstate, magnesium tungstate, aluminum tungstate, silicotungstic acid, ammonium tungstate, ammonium paratungstate or ammonium metatungstate. The fluorination catalyst has the advantages of high use temperature, high catalysis activity and long service life, and can be mainly used in reactions for preparing fluorinated alkenes through gas phase catalysis of fluorination of alkenyl halides at a high temperature.

The invention discloses a methyl cellulose (MC) nylon nano conductive composite material and a preparation method thereof. The material comprises the following chemical components by weight percent: 85%-100% of MC nylon and 0%-15% of conductive filling material, wherein the conductive filling material is one or two or more than two of natural crystalline flake graphite, expanded graphite, conductive carbon black, carbon fiber and carbon nano tube; and the conductive filling material is treated with a modifier, the use amount of the modifier is 0-10% of the use amount of the conductive fillingmaterial, and the modifier is one or two or more than two of gamma-trimethoxypropylsilane coupling agent, gamma-aminopropyltrimethoxysilane coupling agent, gamma-aminopropyltriethoxysilane coupling agent, gamma-aminopropylmethyldimethoxysilane coupling agent, metatitanic acid coupling agent, phosphate coupling agent, aluminate coupling agent and organic acid chromium compound. The MC nylon nano conductive composite material has the advantages of good comprehensive performance and use property.

An aqueous composition for applying to and treating metallic substrates that does not include chrome or chromium-containing compounds, does not include an organic solvent, and promotes adhesion of overcoat layers that are applied to the metallic substrate. The composition is an aqueous solution that includes of two hydrolyzed silanes, and water, wherein the composition has a pH of less than or equal to 5 and is substantially free of organic solvent and any chromium-containing compound.

Also provided is a method for applying a chromium-free treatment on a metallic substrate comprising mixing a cross-liking agent with the above-described composition and applying the resulting mixture to the metallic substrate, and drying the metallic substrate.