313results about How to "Meet practical application requirements" patented technology

The invention relates to the technical field of coatings, in particular to a bicomponent oily polyurethane primer with low VOC (Volatile Organic Compounds) and a preparation method thereof. The primer comprises a component A, a component B and a diluting agent, wherein the ratio in parts by weight of the component A to the component B is 2:1, wherein the component A comprises polyhydric alcohol resin with high solid content, an ester solvent, a dispersing agent, a matting powder, a defoaming agent and an anti-sediment agent; according to the preparation method, different molecular weights of the polyhydric alcohol resin in the component A and the polyisocyanates in the component B are respectively screened, the optimal molecular weight is intercepted so as to ensure the dissolubility of the polyhydric alcohol resin and the polyisocyanates in a ketone solvent, meanwhile, other auxiliaries are used for carrying out stem grafting improvement on a molecular structure to enhance the miscibility of the two components; and therefore, the bicomponent oily polyurethane primer not only has the characteristics of good application property, good water resisting property, high hardness and thelike owned by the traditional polyurethane paint, but also ensures that the content of the volatile organic compounds is greatly reduced and even is lower than 450g / L.

The invention discloses a method for manufacturing a high-performance in-situ TiC reinforced titanium-based composite workpiece on the basis of CNTs and a laser additive manufacturing and processing technology. The method includes the following steps that (1) the carbon nano tubes are subjected to preliminary ultrasonic dispersion treatment; (2) pure titanium powder with the average particle size of 45-75 microns is mixed with the carbon nano tubes to obtain a mixture, and CNTs / Ti mixed powder is obtained by ball-milling the mixture through a ball mill under the protection of argon; and (3) the ball-milled CNTs / Ti mixed powder is shaped through a laser additive manufacturing and processing method so as to obtain a high-performance in-situ TiC reinforced titanium-based composite body. The method has the advantages that in-situ TiC reinforcement phases are formed on the basis of a CNTs in-situ reaction and evenly distributed in a titanium substrate, and the interface bonding strength is high; grains of a composite are refined remarkably; net forming or near-net forming of a test piece can be achieved; any complex heterogeneous part can be formed.

The invention relates to a light source of an LED (light-emitting diode) insect killing lamp with multiple crest optical spectrums, belonging to a semiconductor LED (light-emitting diode) light source and the application field thereof. The light source comprises a lamp holder, a transparent light tube and a metal heat dissipating column arranged in the transparent lamp holder; an LED (light-emitting diode) metal base printed circuit board on which a luminescent device is surface-mounted is arranged on the metal heat dissipating column; the metal heat dissipating column is a regular polygon hollow cylindrical surface body; a regular hexagon is preferably used as the cross section of the metal heat dissipating column; the spectrum range of the light source is in the range of 320-650nm; the number of the crests of the light spectrum is 6; and the crests have different luminous colors and comprise an ultraviolet LED (light-emitting diode), a blue light LED (light-emitting diode), a green light LED (light-emitting diode), a green yellow light LED (light-emitting diode), a yellow light LED (light-emitting diode) and an orange red light LED (light-emitting diode) which are different in main wavelength. The radiation efficiency is increased from 12% of a black light lamp to 20%; and therefore, the Light source has the advantages of saving the energy source consumption, being beneficial to energy saving, environmental friendliness and having low cost. The service life of the light source is prolonged to ten thousand hours; the angles of light beams are increased from 120 degrees of an LED (light-emitting diode) luminous element to 360 degrees of the LED (light-emitting diode) light source so that the whole light spectrum trapping on different types of insets at different growth stages is effectively realized.

The invention provides a polymerization method for preparing fluorine-containing alternating copolymer through gradual transfer-addition-ending with free radicals under the condition of visible light. The preparation method includes the following steps that 1, two types of bifunctional monomers A and B, a photocatalyst, a reducing agent and mixed organic solvent are simultaneously added into a reaction reactor and stirred till a system is in a homogeneous phase, after deoxygenization is conducted four times, the reaction container is sealed, and a homogeneous polymerization system I is obtained; 2, the temperature of the reaction container is set to be 25 DEG C, the rotation speed is set to be 1500-2000 rpm, the homogeneous polymerization system I is subjected to a polymerization reaction under visible light, and the reaction time is 0.5-24 hours; 3, after the reaction is ended, the reaction container is opened, tetrahydrofuran is added to dilute the system, the diluted substance is poured into methyl alcohol for sediment, then suction filtration and drying are conducted, and the fluorine-containing alternating copolymer is obtained. By the application of the novel polymerization method, the fluorine-containing alternating copolymer is obtained successfully, and the polymerization method is a brand-new polymerization method.

The invention discloses a self-supported lithium ion battery gel polymer electrolyte and a preparation method thereof. In the invention, at first, a multi-polymer is obtained by polymerizing the latexes of a methacrylic acid N-Butyl Acetate monomer and a styrene monomer of different proportions; then under the condition of ultrasonic, 10 to 30 minutes after a certain amount of nanometer particles are dispersed in a tetrahydrofuran solvent, the powder of the polymer is dissolved into the liquor to obtain ropy gel; a self-supported lithium ion battery gel polymer membrane is obtained by a phase transfer method; the membrane is dipped into the electrolyte, thus obtaining the gel polymer electrolyte. The gel polymer electrolyte is good in thermal stability, has a high decomposition temperature, is simple in preparation technique and is suitable for the industrial production of the lithium ions of the polymer, with the raw materials easily gotten.

The invention provides fingerprint recognition pretreatment method and device. The method comprises the following steps that: fingerprint images with little information content and compactness in high frequency images as wavelet basis are selected; wavelet transformation is carried out on the collected fingerprint images to obtain low-frequency images, because pixel points of the low-frequency images and the high-frequency images are in one-to-one correspondence, the low-frequency images reserve ridge directions and frequency information of original fingerprint images, and the direction of each pixel obtained through high-frequency estimation can be used as the ridge directions of pixels corresponding to the high-frequency images. Thereby, the invention only considers the information of the low-frequency images to estimate the pixel direction, effectively inhibits the influence of high-frequency noise on fingerprint image quality, realizes the strengthening of the fingerprint images and improves the quality of the fingerprint images, thus improving the fingerprint recognition accuracy and the recognition speed, meeting more practical application requirements of the fingerprint recognition and widening the application range of the fingerprint recognition.

The system is composed of pumping laser, wavelength division multiplexer optical fibre, coupler, transducer, isolator and spectrograph. In the method erbium-doped optical fibre and optical fibre Fizean strain transducer are applied, amplifying function of erbium-doped optical fiber is utilized to not only form wideband light source but also to amplify weak signal, frequency division multiplexing for above ten optical fibre Fizeau transducers can be realized based on above-mentioned function so two shortcomings of weak signal and difficult multiplexing on existing optical fibre Fabry-Perot transducer can be basically solved.

The invention provides a polymerization method for preparing fluorine-containing alternative polymer through a photocatalyst. The polymerization method includes following steps: (1), adding two bifunctional monomers A and B, organic photocatalyst and promoter into a mixed organic solvent system, stirring in a reaction container to enable the system to be homogeneous, and sealing the reaction container after deoxidizing for four times; (2), setting temperature of the reaction container to 25 DEG C, and allowing polymerization reaction for 1-200h through photocatalysis in a condition that rotating speed is 1500-2000rpm; (3), after the reaction is finished, adding tetrahydrofuran to dilute a polymerization system, pouring into methanol, precipitating, suction-filtering, and drying to obtain the fluorine-containing alternative polymer. The organic photocatalyst is used to replace a conventional metal photocatalyst, a free radical step-by-step polymerization novel method which is simple, economical, efficient and environment-friendly is designed, and a brand-new method is provided to obtain various fluorine-containing alternative polymers having different microstructures.

The invention discloses an accurate target distance measurement method based on monocular vision, belongs to the field of computer visual computation, and is mainly applied to the target distance measurement technology of a front vehicle in intelligent driving scene perception. The method is mainly divided into four major parts, including camera calibration, target distance measurement key point selection, target distance measurement and error correction. A proper distance measurement key point is selected, various distance measurement algorithms are combined, a distance measurement error is corrected, and finally, the accurate distance of the target is obtained. The method can be applied to various industries based on visual computation, for example, the method can be applied to the target distance measurement of the front vehicle of an autonomous vehicle, urban traffic vehicle detection and behavior intention analysis, intelligent robot target distance measurement and the like, and the method exhibits higher accuracy than other visual distance measurement methods.