摘要:
At least one smoothing reactor is connected to the positive terminal of a DC source. A first interphase reactor has its one end connected to the other end of the smoothing reactor. A second interphase reactor is connected to the negative terminal of the DC source. Each of the first and second interphase reactors has first and second terminals at the other end thereof. Connected between the first terminals of the first and second interphase reactors is a first inverter comprising three main valves on each side of the positive and negative terminals, i.e., a total of six main valves each having a control gate and forming a first three-phase bridge. Also connected between the second terminals of the first and second interphase reactors is a second inverter comprising three main valves arranged on each side of the positive and negative terminals, i.e., a total of six main valves each having a control gate and forming a second three-phase bridge. The three-phase output terminals of the first and second inverters are respectively connected in common to a load to supply first-phase, second-phase and third-phase output currents to the load. A control unit applies control gate pulses to the control gates of the positive-terminal-side and negative-terminal-side main valves of the first and second inverters in the order of the first, second and third phases to shape the waveform of each output current to the load into a rectangular waveform. The control unit controls the first and second inverters in such a manner that the current valves of two currents which flow to the main valves of the first and second inverters having the same phase and polarity includes ranges in which the currents periodically assume the same current value.
摘要:
An induction motor is operated by a power supply of variable voltage and variable frequency. The voltage and frequency of the variable-voltage variable-frequency power supply is changed by a control circuit to accelerate or decelerate the induction motor. For slowly controlling the speed of the induction motor, the ratio of the output voltage to the output frequency of the variable-voltage variable-frequency power supply is maintained substantially constant. The control circuit includes a voltage correcting means which, in response to a command for sudden acceleration or deceleration of the speed of the motor, corrects the output voltage of the power supply in accordance with the acceleration or deceleration rate and the prevailing magnitude of the output frequency of the variable-voltage variable-frequency power supply.
摘要:
An objective of the present invention is to provide a lignocellulose material exhibiting superior dimensional stability and having a reduced water-absorbing property, as well as provide a lignocellulose hybrid material, a paper product or a wood product, with superior dimensional stability and a reduced water-absorbing property. In the present invention, a lignocellulose material is treated with a treatment agent for use in a lignocellulose material containing: (A) a polyvalent carboxylic acid or a derivative thereof; and (B) a silicon compound containing a functional group binding to a silicon atom, and thereby, a lignocellulose hybrid material is obtained. In addition, a paper product or a wood product is obtained by using the aforementioned lignocellulose hybrid material.
摘要:
A methacryloxy group- or acryloxy group-containing polyorganosiloxane in which a methacryloxy group or acryloxy group is bonded to a silicon atom in the polyorganosiloxane across a long-chain alkylene group or poly(alkyleneoxy)-long chain-alkylene group having 11 to 20 carbon atoms. A method of producing this methacryloxy group- or acryloxy group-containing polyorganosiloxane, in which a silicon-bonded hydrogen atom-containing polyorganosiloxane is addition reacted in the presence of a hydrosilylation reaction catalyst with a 1-alkenyl methacrylate or a 1-alkenyl acrylate or a 1-alkenyloxypolyalkylene glycol methacrylate or a 1-alkenyloxypolyalkylene glycol acrylate.
摘要:
The present invention provides a novel fluorine-containing rubber composite material having both of excellent fuel impermeability and excellent cold resistance, a fuel impermeable sealing material comprising the composite material and a process for preparing the composite material. The fluorine-containing rubber composite material comprises crosslinked particles of fluorine-containing silicone rubber dispersed in a fluorine-containing rubber. It is preferable that the fluorine-containing rubber comprises a vinylidene fluoride/tetrafluoroethylene/perfluoro vinyl ether copolymer, and the composite material has cold resistance of not more than −35° C. and fuel permeability of not more than 500 g·mm/m2·day. The fuel impermeable sealing material comprises the composite material. The process for preparing the composite material comprises a step for co-coagulation of a fluorine-containing rubber emulsion and an emulsion of crosslinked fluorine-containing silicone rubber.
摘要:
A method for distillation of organosilicon compounds that contain acryloxy or methacryloxy groups characterized by subjecting an organosilicon compound (A) that contains acryloxy or methacryloxy groups to distillation in the presence of a polymerization inhibitor (B) and a compound (C) with aliphatic conjugated unsaturated bonds.
摘要:
An organopolysiloxane-modified polysaccharide prepared by esterification reacting (A) an organopolysiloxane having residual carboxylic anhydride groups and (B) a polysaccharide having hydroxyl groups, wherein the organopolysiloxane is bonded to the polysaccharide through half ester groups, and a process for the preparation of organopolysiloxane-modified polysaccharide, in which component (A) and component (B) are subjected to an esterification reaction in the presence of (C) a non-protonic polar solvent. The organopolysiloxane-modified polysaccharide comprising polysaccharide and organopolysiloxane bonded thereto through half ester groups is novel. The process for the preparation of organopolysiloxane-modified polysaccharide permits introduction of organopolysiloxane into polysaccharide at a high introduction ratio.
摘要:
A process for the production of a cyclic siloxane described by formula (R1(CH3)SiO)d comprising reacting in the presence of an alkali catalyst a siloxane mixture comprising a silane or a linear siloxane described by general formula HO(R1(CH3)SiO)bH and a cyclic siloxane described by general formula (R1(CH3)SiO)c, where R1 is an alkenyl group having 6 to 14 carbon atoms, b is an integer of one or greater, c is an integer of 3 or greater, and d is an integer of 3 or greater.
摘要:
A thermally conductive silicone rubber composition, comprising (A) a curable organopolysiloxane (B) a curing agent; and (C) a filler prepared by treating the surface of a thermally conductive filler with an oligosiloxane having a formula selected from (i) (R1O)aSi(OSiR23)(4−a) and (ii) (R1O)aR2(3−a)SiO[R22SiO]nSi(OSiR23)bR2(3−b) wherein R1 is alkyl, each R2 is independently a monovalent hydrocarbon group free of aliphatic unsaturation, subscript a is an integer from 1 to 3, b is an integer from 1 to 3, and n is an integer having a value greater than or equal to 0.
摘要:
This invention relates to a macromonomer and a method for its preparation. The macromonomer has one or more silicon-bonded hydrogen atoms at one molecular chain terminal, and one or more aliphatically unsaturated silicon-bonded organic groups at the other molecular chain terminal. This invention further relates to a method of forming a hyperbranched polymer by polymerizing the macromonomer with a group VIII metal catalyst. The hyperbranched polymers can be used as surfactants, gelling agents, drug delivery systems, and polymeric absorbents.