4results about How to "Avoid darkening" patented technology

The invention provides a method for rapidly extracting light-color phenolated lignin, and belongs to the field of biomass refining. The method comprises the following steps: uniformly mixing a lignocellulose raw material with a mixed solution of aromatic sulfonic acid and a phenolic compound according to a certain solid-to-liquid ratio, and carrying out ultrasonic treatment at a certain temperature; and after the treatment is completed, carrying out solid-liquid separation, pouring the obtained extracting solution into water to precipitate lignin, and washing and drying to obtain the light-color phenolated lignin. The method disclosed by the invention is simple in process, low in time consumption and high in yield, and the solvent is easy to recycle; the prepared lignin is extremely light in color and high in phenolic hydroxyl group content, retains most of aryl ether bonds, can adjust the content of phenolic hydroxyl groups and methoxyl groups in the lignin to a certain extent, and solves the problems of dark color, few functional groups and low reaction activity of the existing industrial lignin. The method can be used for producing lignin-based functional products without further color reduction and activation treatment.

The application discloses a cellulose solution containing a stabilizer and a preparation method and application thereof, and the preparation method comprises the following steps: stirring and mixing an ionic liquid and a stabilizer at room temperature until a uniform mixture is obtained; adding a cellulose raw material into the obtained mixture, fully stirring and pre-mixing at room temperature to form a pre-dissolved cellulose mixture; and heating and stirring the obtained cellulose mixture until the cellulose raw material is completely dissolved to form a uniform and transparent cellulose solution, that is, the cellulose solution containing the stabilizer is obtained. By adding the stabilizer, the application reduces the color deepening of the ionic liquid in the process of dissolving the cellulose under high temperature or water-containing conditions.

The invention discloses an HUD virtual image and real environment polarization matching detection method. The method comprises the following steps: when an HUD projects a virtual image, collecting a virtual polarization parameter set of a plurality of preset test points in an HUD virtual image picture; synchronously acquiring a real environment polarization parameter set of real environment light in corresponding directions of the plurality of preset test points; inputting the virtual polarization parameter set and the real environment polarization parameter set into a preset polarization matching degree evaluation model, and calculating a matching degree score of each preset test point; when at least one of the matching degree scores of the preset test points is lower than a preset threshold value, it is judged that the test points have polarization conflicts, and polarization conflict types and conflict position information are output. According to the method and the device, the visibility of the virtual image under the polarized sunglasses and the visual consistency of the virtual image and the real ambient light are ensured, so that the darkening, disappearance, glare and visual fatigue of the image are avoided, and the driving safety and the user experience are remarkably improved.

The present invention provides a semi-aromatic polyamide and its prepolymer and preparation method. The discreteness of the semi-aromatic polyamide prepolymer is 0.1-5.0. The preparation method of the semi-aromatic polyamide prepolymer comprises the following steps: spraying the semi-aromatic polyamide prepolymer reaction liquid into a flash evaporation device and simultaneously performing a crushing treatment to obtain particles of the semi-aromatic polyamide prepolymer; wherein the flash evaporation device is provided with a crushing device and / or a shredding device; the crushing device and / or the shredding device is provided with a cutter, and the rotation speed of the cutter is 100-8000 rpm. The present invention also provides a semi-aromatic polyamide prepared based on the above-mentioned semi-aromatic polyamide prepolymer. The technical scheme of the present invention can effectively prevent the yellowing and blackening problems caused by the overheating side reaction inside the prepolymer due to the agglomeration of the prepolymer during the discharging process of the prepolymer, and at the same time, the prepolymer has a low discreteness, which improves the mechanical properties of the subsequent viscosity-enhancing products, and has a very large production and application prospect.