摘要:
A cutting insert for a multifunctional endmill is capable of using three corners. The cutting insert includes a top surface and a bottom surface having an outer shape of a substantially polygonal shape and four side surfaces extending between the top surface and the bottom surface, a first side surface has a positive flank angle, a second side surface has a positive flank angle, a third side surface has the positive flank angle, the first side surface includes a first and a second component surfaces connected with each other so that the first side surface protrudes outward from a peripheral surface of the cutting insert, and a connection portion between a first and a second component surface extends between the top surface and the bottom surface.
摘要:
The invention provides a thermoplastic resin composition which is excellent in transparency, heat resistance, resistance to chemicals, and mechanical strength as well as moldability, printability, etc. The thermoplastic resin composition containing a polycarbonate resin in an amount of 2 to 99.5 wt. % and a polyester resin in an amount of 98 to 0.5 wt. %, wherein the polyester resin (B) contains diol units each having a cyclic acetal skeleton in an amount of 20 to 60 mol % with respect to total diol structural units.
摘要:
This invention provides a compact effluent water reclamation apparatus which is minimized in the kinds and amounts of chemicals to be used for the recovery of water to thereby reduce the amount of waste and eliminate equipment which necessitates a large area for installation. The effluent water reclamation apparatus comprises a reverse osmosis device and is adapted to treat acid-alkali effluent water containing organic matter but no fluorine, by concentrating the acid-alkali effluent water containing organic matter by reverse osmosis, evaporating the resulting concentrated water to dryness and collecting the water permeating through a reverse osmosis membrane. The apparatus is characterized in that the apparatus comprises as arranged upstream from the reverse osmosis device a neutralizing device for neutralizing the effluent water to prevent a scale component from separating out from the effluent water in the process of reverse osmosis, and a biological treatment tank for biologically treating the neutralized effluent water.
摘要:
An apparatus for removing non-condensable gas accumulated in the exchanger tubes of a heat exchanger. A vertically elongated tank having retained in its lower portion a liquefied working medium for the exchanger tubes is provided beside the heat exchanger. The tank communicates as its lower portion with the lower ends of the tubes and at its upper portion with the upper ends of the tubes by lines each provided with a valve. A gas release pipe extends downward from outside into the upper portion of the tank through the tank wall. A working medium condensing cooling tube is provided in the upper portion of the tank. The interior of the tank is partitioned into a condensing tank and a tank main body positioned therebelow and having an upper portion communicating with the upper portion of the condensing tank and a lower portion communicating with the lower portion of the condensing tank. The non-condensable gas is withdrawn from the exchanger tubes in portions of progressively increasing pressure and led into the tank, and the gas is released from the tank to the atmosphere through the release pipe after the gas has been withdrawn from all the tubes.
摘要:
Provided are: an electrode for a fuel cell, which is obtained by impregnating a supporting base with a vinyl polymer composition and a fuel cell catalyst, the vinyl polymer composition in which a vinyl polymer A having at least one kind of crosslinkable group selected from the group consisting of an epoxy group and an isocyanate group protected by a protecting group and a vinyl polymer B having at least one kind of crosslinkable group selected from the group consisting of a hydroxyl group, a carboxyl group, and an amino group are contained, and at least one of the vinyl polymer A and the vinyl polymer B has an acidic group forming a salt, reacting the crosslinkable group of the vinyl polymer A with the crosslinkable group of the vinyl polymer B, and then subjecting the salt to proton exchange; a method for producing the same; and a fuel cell including an electrolyte membrane and the electrode for a fuel cell.
摘要:
Disclosed is an acrylic syrup containing a vinyl monomer (A) of methyl methacrylate and a polymerized solid component (B) which is a high polymer of said vinyl monomer and has a weight average molecular weight of from 30,000 to 2,000,000 as measured by the GPC and a viscosity at 25° C. of from 0.1 to 50 Pa·s, wherein at least part of said polymerized solid component (B) is a grafted rubber obtained by graft-polymerizing said vinyl monomer with a rubbery polymer, and said grafted rubber has a large branching coefficient. The acrylic resin molded articles obtained from the acrylic syrup exhibit excellent impact resistance.
摘要:
A methyl methacrylate syrup is produced by the steps of (1) preparing a starting material comprising methyl methacrylate or a monomer mixture mainly comprising methyl methacrylate, and dividing the starting material into 20 to 70% by weight of an initial charge and 30 to 80% by weight of an after-charge; (2) heating the initial charge in a reactor; (3) adding a whole protion of a chain transfer agent at the time when the initial charge reaches a reaction temperature; (4) adding the after-charge over 0.1 to 10 hours together with a polymerization initiator having a half-life of 10 to 300 seconds at the reaction temperature; (5) continuing the heating after the addition of the after-charge and the polymerization initiator is complete; and (6) adding a hindered phenol polymerization inhibitor at the time the heating is finished. The methyl methacrylate syrup thus produced is excellent in storage stability.
摘要:
A process for continuously preparing a high quality methacrylic polymer with a high productivity is provided. The process comprises continuously polymerizing methyl methacrylate alone or a monomer mixture of methyl methacrylate and an alkyl acrylate by a solution polymerization using methanol as a solvent, directly feeding the resulting polymerization reaction product to an extruder having a plurality of vents, and extruding the polymer, while volatiles are removed through the vents.
摘要:
There is disclosed a process for producing a glycidyl ester of acrylic acid or methacrylic acid which comprises the steps of neutralizing acrylic acid or methacrylic acid with a carbonate or a bicarbonate of an alkali metal in an excess amount of epichlorohydrin while an oxygen-containing gas is blown into the liquid reaction system; subjecting water formed by the neutralization and epichlorohydrin to azeotropic distillation to discharge them outside the reaction system and to form an alkali metal salt of acrylic acid or methacrylic acid; adding a quaternary ammonium salt as a catalyst to the reaction system to react the alkali metal salt of the acid with the epichlorohydrin and thus synthesize the glycidyl ester of the acid; cooling the liquid reaction product while recovering part of the excess epichlorohydrin under reduced pressure; adding aqueous solution of an alkali hydroxide to the liquid reaction product to separate into aqueous layer and organic layer; adding a catalyst deactivator to the organic phase; and subsequently distilling the organic layer to separate the glycidyl ester of the acid while blowing an oxygen-containing gas into the organic layer. The above process makes it possible to efficiently produce a highly pure glycidyl ester of acrylic acid or methacrylic acid in high yield with minimized contents of impurities.
摘要:
A process is provided for preparing a high-quality methyl methacrylate polymer by polymerizing a monomer comprising methyl methacrylate as a main component in the presence of a radical polymerization initiator, a chain transfer agent, and 5 to less than 10 wt. % methanol. The polymerization is carried out in a uniform solution. According to this process, a methyl methacrylate polymer is obtained which reduces the generation of silver streaks, voids, coloring, odor and the like at the time of thermal molding.