Abstract: Disclosed herein are a preparation method for an alicyclic carbamate and the use thereof. The preparation method comprises the following steps: mixing a carbamate containing an aromatic ring, a catalyst and a solvent, and then introducing hydrogen for reaction to obtain the alicyclic carbamate, wherein the catalyst comprises a carrier and an active component, which is loaded on the carrier, the active component comprising any one or a combination of at least two of Pt, Rh, Ru, Ir or Pd. The preparation method for the alicyclic carbamate provided in the present application has mild reaction conditions, easy operation, low potential safety hazard and a high yield of the alicyclic carbamate, is suitable for multiple reactors, is easy for large-scale continuous production, and has good industrial application prospects.

Abstract: Disclosed is a preparation method for preparing diphenylmethane diisocyanate. The preparation method comprises: under a catalyst condition, performing a pyrolysis reaction on diphenylmethane dicarbamate in an inert solvent having a boiling point lower than that of diphenylmethane diisocyanate to obtain diphenylmethane diisocyanate.

Abstract: A valve core for an electronic valve, which includes a valve head, and an armature. The valve head and the armature being connected to each other by means of a guide rod. The valve core is part of an electronic valve. The valve head and armature are connected by means of the guide rod, which reduces the cost for manufacturing the armature. The electronic valve includes an upper stator and a lower stator, an upper bearing and a lower bearing for guiding the guide rod, an elastic component for biasing the valve head, a sleeve surrounding the periphery of the armature, a bobbin which at least partially surrounds the sleeve, and a coil wound on the bobbin. The electronic valve of the present invention may be used as a compressed gas bypass valve of a turbocharged engine.

Abstract: A valve core for an electronic valve, which includes a valve head, and an armature. The valve head and the armature being connected to each other by means of a guide rod. The valve core is part of an electronic valve. The valve head and armature are connected by means of the guide rod, which reduces the cost for manufacturing the armature. The electronic valve includes an upper stator and a lower stator, an upper bearing and a lower bearing for guiding the guide rod, an elastic component for biasing the valve head, a sleeve surrounding the periphery of the armature, a bobbin which at least partially surrounds the sleeve, and a coil wound on the bobbin. The electronic valve of the present invention may be used as a compressed gas bypass valve of a turbocharged engine.

Abstract: A method for preparing polymethylene polyphenyl polycarbamate is provided. The method includes dissolving phenylcarbamate in a water-immiscible organic solvent to form a solution A, formulating an aqueous acid catalyst solution to form a solution B, forming a reaction system comprising an organic phase and an aqueous phase by firstly adding a methylating reagent to the solution B and then mixing the solution A and the solution B, wherein the organic phase comprises phenylcarbamate and the aqueous phase comprises the acid catalyst and the methylating reagent. The method further includes reacting the reaction system under stirring at a reaction temperature of 30° C. to 200° C. and a reaction pressure of 0.05 MPa to 5 MPa to produce a polymethylene polyphenyl polycarbamate product mixture dissolved in the organic phase, and separating the polymethylene polyphenyl polycarbamate product mixture by allowing the organic phase and the aqueous phase to stand still and stratify.

Abstract: A method for preparing polymethylene polyphenyl polycarbamate is provided, which is carried out through the condensation of phenylcarbamate with a methylating reagent under the catalyzation of a phase transfer acid catalyst. The method comprises: dissolving phenylcarbamate in a water-immiscible organic solvent to form a solution A; formulating an aqueous acid catalyst solution to fibrin a solution B; forming a reaction system comprising an organic phase and an aqueous phase by firstly adding a methylating reagent to the solution B and then mixing the solution A and the solution B or by adding the methylating reagent at the same time of mixing the solution A and the solution B or after mixing the solution A and the solution B; reacting the reaction system under stirring at a reaction temperature of 30° C. to 200° C. and a reaction pressure of 0.

Abstract: A divided LED lamp includes an LED assembly, a casing assembly, LED electronics, power and signal cables, a control panel including a display screen and operation buttons, and a bracket for mounting the lamp. The casing assembly includes a first casing member and a second casing member. At least one cable tube is formed between the first casing member and the second casing member. The power and signal cables that connect the LED assembly received in the first casing member and the LED electronics received in the second casing member are received through the cable tube. This arrangement allows the LED assembly and the LED electronics to be received in individual and independent casing members and are associated with respective individual heat dissipation fins or heat radiators, so as to realize high efficiency of heat dissipation, stabilized operation, and extended lifespan.

Abstract: A divided LED lamp includes an LED assembly, a casing assembly, LED electronics, power and signal cables, a control panel including a display screen and operation buttons, and a bracket for mounting the lamp. The casing assembly includes a first casing member and a second casing member. At least one cable tube is formed between the first casing member and the second casing member. The power and signal cables that connect the LED assembly received in the first casing member and the LED electronics received in the second casing member are received through the cable tube. This arrangement allows the LED assembly and the LED electronics to be received in individual and independent casing members and are associated with respective individual heat dissipation fins or heat radiators, so as to realize high efficiency of heat dissipation, stabilized operation, and extended lifespan.