摘要:
Compound of the formula, ##STR1## wherein X is a hydrogen atom, a halogen atom, a lower alkyl group or a lower alkoxyl group, R.sup.1 is a methyl group or an ethyl group, R.sup.2 is a hydrogen atom, a lower alkyl group or an allyl group, and each of R.sup.3 and R.sup.4, independently, is a hydrogen atom, a methyl group or an ethyl group; provided that R.sup.1, R.sup.3 and R.sup.4 are not methyl groups simultaneously when both X and R.sup.2 are hydrogen atoms, and compositions containing these compounds exhibit herbicidal activity.
摘要:
A process is disclosed for coating paper with a novel water-soluble thermosetting resin, which has the property of providing paper with a nearly constant wet and dry strength over a wide pH range; the resin can be mixed, if desired, with other water-soluble polymers such as starch, its derivatives, cellulose derivatives, polyvinylalcohol and polyacrylamide, and various pigments such as clay, calcium carbonate and titanium dioxide.
摘要:
A solid electrolytic capacitor having excellent characteristics in terms of both electrical properties and thermal stability is obtained by employing a solid electrolyte comprising both an electrically conductive polymer layer (I) formed by a chemical oxidation method and an electrically conductive polymer layer (II) formed by an electrochemical oxidation method.
摘要:
An improved electrolytic cell of simple construction capable of satisfactorily producing periodates comprises a plurality of cathodes mounted vertically in parallel to the long sides of a cell body and spaced at equal intervals from each other, a plurality of open anodic compartment boxes with plate separators adapted to maintain the equal intervals, one or more anodes inserted in the compartment boxes, a plurality of PVC diaphragms mounted on both sides of the anodic compartment boxes in parallel to the cathodes, an anolyte inlet mounted in the lower part of the anodic compartment boxes and an anolyte outlet mounted in the upper part of the opposite side of the anodic compartment boxes, a cell cover provided with air intake holes and cell gas exhaust pipes, and perforated PVC lids for the cathodic compartments positioned between the cell cover and the upper level of the catholyte.
摘要:
Highly pure chlorine dioxide is generated very efficiently and safely in a single generator-crystallizer by reducing an alkali metal chlorate with chloride ion in a strong acid in the presence of hydrogen peroxide and a complex catalyst of palladium (II) with chloride ion.
摘要:
An anode coated with .beta.-lead dioxide which comprises a titanium substrate, titanium expanded metal welded on at least one side of the titanium substrate, titanium reinforcing bars welded on the peripheries of said expanded metal to both said expanded metal and said substrate, at least one intermediate layer being applied on said substrate and said expanded metal, said intermediate layer consisting either of an alloy or an oxide of platinum group metals; and a .beta.-lead dioxide coating layer on said intermediate layer.The anode of this invention has particularly good dimensional stability and provides excellent adhesion of the .beta.-lead dioxide coating layer to the substrate, and hence is highly suitable for the electrolytic production of chlorates, perchlorates, and periodates, and furthermore it is also useful as an insoluble anode in electroplating and in electrolytic treatment of waste water.
摘要:
An insoluble anode for generating oxygen which comprises a substrate made of titanium or an alloy thereof, a first coating on said substrate which is made of metallic bismuth or bismuth oxides, and a second coating on said first coating which is made of metallic iridium and iridium dioxide, has greatly improved durability and permits use for a long period of time.
摘要:
After silver has been recovered from a photographic waste solution, said waste solution is electrolytically purified by adding chloride ion and carbonate ion or chloride ion, carbonate ion and iodide or iodate ion to said waste solution under limited pH, temperature, anode current density and current concentration conditions.
摘要:
Improved alumina-zirconia composite sintered materials with sufficient high mechanical strength and thermal shock resistance as well as excellent hardwearing resistance are made by mixing, heating and melting zirconia and alumina, then the produced melt was quenched, and the resulting solid was ground and milled while adding thereto at least one compound of ceria and/or titania, to an average grain size of from about 0.5 to about 1.5 .mu.m, and subjected the resulting powder to molding and sintering at a temperature of from 1450.degree. to about 1600.degree. C., said zirconia, ceria and titania being employed in the amount of about 10-20%, about 3-7%, and about 15-25% by weight, respectively, plus the balance of alumina. Said sintered materials are useful for employment in structural materials, refractorial materials, erosion resistance materials, cutting tool materials, grinding and polishing materials, etc.
摘要:
Alumina-zirconia composite sintered materials having sufficient high-temperature strength and thermal shock resistance as well as excellent mechanical strength are made by mixing Bayer alumina and/or bauxite as an alumina and baddeleyite and/or zircon sand as a zirconia material in amounts of 50 to 95% by weight of alumina, the balance being zirconia, respectively, subjecting the mixture to heating, melting and quenching, grinding the resulting solid to an average grain size of 10 .mu.m or smaller, and subjecting the resulting powder to molding and sintering.