46results about How to "Multiple preferred combinations" patented technology

The invention relates to thermosetting polyimide resin, a prepolymer, a preparation method and an application thereof, belong to the technical field of thermosetting polyimide resin, and solve the problem that the glass-transition temperature of cured resin is relatively low while the existing polyimide resin prepolymer meets the requirements of an RTM (resin transfer molding) process. The polyimide resin prepolymer is prepared from aromatic dianhydride, rigid aromatic diamine, diamine containing a siloxane structure and an end-capping reagent. The preparation method of the thermosetting polyimide resin comprises the following steps: heating and melting the prepolymer; heating to 370-400 DEG C, curing for 1-2 hours, and cooling to obtain cured resin; and treating the cured resin at 400-450DEG C for 1-8 hours to obtain the thermosetting polyimide resin. According to the invention, RTM molding process requirements and high temperature resistance are both considered.

The invention relates to a method for determining a prohibition period of a photoetching process node and a simulation method, belongs to the technical field of semiconductor photoetching, and solvesthe problems that the found prohibition period is inaccurate, layout design rules cannot be effectively guided to be formulated, and reasons of poor photoetching quality of individual graphs cannot bejudged in a photoetching stage. The method for determining the prohibition period of the photoetching process node comprises the following steps: acquiring a test pattern; setting a first light source and simulation parameters, and performing simulation by utilizing software; analyzing a simulation result, drawing a first curve, and finding out a period range (first period range) which is obviously lower than other values in the first curve; setting a second light source and light source parameters, and drawing a second curve; finding out a period range (second period range) which is obviously lower than other values in the second curve, and combining the second period range and the first period range to jointly determine a forbidden period range. According to the invention, the prohibition period under a technical node is simply, efficiently and accurately determined.

The invention relates to a folding control surface assembling method, belongs to the technical field of control surface assembling, and solves the problems that in the existing control surface assembling process, the pre-tightening force of a torsion spring is difficult to control and align, the positioning and clamping requirements of front and rear sections of a control surface are high, and the accessibility of manual operation in a narrow space is poor. The folding control surface assembling method comprises the steps that the front section of the control surface is positioned and clamped through a first positioning and clamping structure; a second positioning and clamping structure is adopted for positioning and clamping the rear section of the control surface; a torsion spring positioning piece is inserted into a mounting hole close to the front section of the control surface; a hand wheel lead screw is rotated, so that the control surface rear-section screw hole is aligned with a control surface front-section screw hole; and screws are installed, and installation of the control surface front section and the control surface rear section is completed. A folding control surface assembling tool comprises the first positioning and clamping structure, the second positioning and clamping structure, a torsion spring alignment structure and a directional driving mechanism. Positioning, clamping, relative movement and reliable locking of the front section and the rear section of the control surface are achieved.

The invention relates to a sensitizer for radiotherapy and its preparation method and application, belonging to the field of nanomaterial chemistry and biochemistry, and solves the problem that the existing radiotherapy sensitizer cannot improve the hypoxic state in the tumor microenvironment, and radiotherapy is not sensitive , The amount of radiation dose is large, and the problem of large damage to normal tissues. The molecular formula of the sensitizer used in radiotherapy is BiO 2‑x , there are oxygen defects in the molecular structure, and the raw materials for the preparation of the sensitizer include alkali metal hydroxides and bismuth salts. The preparation method of the sensitizer comprises: dissolving alkali metal hydroxide and bismuth salt, stirring to obtain a solution; transferring the solution to a reaction container, heating, and reacting for a period of time. BiO of the present invention 2‑x It can be used as a sensitizer for radiosensitization of tumors, and achieves a very good inhibitory effect on tumors at a lower radiation dose.

The invention relates to a method for reducing the amount of phenol-cyanide wastewater, which belongs to the technical field of phenol-cyanide wastewater and solves the problem that there is currently no related technology for reducing the generation of wastewater from the source of phenol-cyanide wastewater, and the waste water produced in each link of the coking process is mixed with many types of pollutants. Handle difficult and high-volume problems. The reduction methods of phenol cyanide wastewater include the reduction treatment of ammonium sulfate acid gas condensate water, the reduction treatment of gas condensate water, the reduction treatment of defoaming water in the phenol cyanide wastewater treatment station and the reduction treatment of accident pools. The invention realizes reducing the production amount of phenol cyanide wastewater from the source.

The invention relates to a polyimide film with excellent comprehensive performance and its preparation method and application, which belongs to the technical field of polyimide and solves the problem of the excellent heat resistance and good adhesion of the existing polyimide film. Performance, low dielectric constant at high frequency and low dielectric loss are difficult to be compatible. The polyimide film is prepared from aromatic dianhydride, aromatic diamine containing diphenyl ether structure and diamine containing siloxane structure. The polyimide adhesive film has excellent heat resistance, high-frequency low-dielectric performance and good adhesion performance, the glass transition temperature is greater than 330 ° C, the dielectric constant at 10 GHz is less than 3, and the dielectric loss value is 0.003 Between ‑0.006, the peel strength after thermocompression bonding with copper foil is greater than 10N / cm, which can meet the application requirements of interlayer bonding and insulation in the manufacture of flexible printed circuit boards and multilayer circuit board laminated wiring processing, and can be widely used It is used in high-frequency flexible printed circuit boards, high-frequency film antennas and other fields.

The invention relates to a forming mold and a forming method for a special-shaped curved surface structural part, which belongs to precision sheet metal processing, and solves the problems in the prior art that it is impossible to form products with non-uniform wall thickness special-shaped curved surfaces at one time, the surface quality of the product is poor, and the processing efficiency is low. . The forming mold includes an upper mold and a lower mold; the upper surface of the lower mold is provided with an opening, and the blank is in contact with the lower surface of the upper mold, and enters the cavity of the lower mold through the opening; the side of the upper mold is provided with steps, and the steps are connected with blanks of different thicknesses. Corresponding to the non-flat surface of . The forming method includes making a blank; welding the blank; placing the welded blank on a forming mold, and the welding seam corresponds to the steps of the upper mold; lowering the upper mold and the jacking cylinder to complete the one-time forming of the non-uniform wall thickness special-shaped curved surface structure. The invention realizes the one-time forming of the non-uniform wall-thickness special-shaped curved surface structural parts.