33results about How to "Energy saving in preparation process" patented technology

The invention discloses a preparation method of a silver-loaded nano cellulose-chitosan composite film, the preparation method of the silver-loaded nano cellulose-chitosan composite film comprises the following steps: adding sodium periodate into a nano cellulose solution, stirring in a dark place, centrifuging for separation, and washing to obtain dialdehydo nano cellulose; adding a newly-prepared saturated silver ammonia solution for preparation of silver-loaded nano cellulose; mixing the silver-loaded nano cellulose with a chitosan solution to obtain a silver-loaded nano cellulose-chitosan antibacterial film. Nano silver particles prepared in the method are evenly distributed in dialdehydo nano cellulose network structures, the easy agglomeration problem of the nano silver particles can be well solved, the preparation process does not require the use of special instruments, also does not need a chemical reducing agent, and the production cost is reduced. Through use of good mechanical properties of the nano cellulose, the low mechanical strength problem of the chitosan film is improved, and the antibacterial property of the chitosan film is improved by silver loading operation. The silver-loaded nano cellulose-chitosan composite film has broad application prospects in antibacterial wound dressings and food packaging and other industries.

The invention discloses a hydrothermal preparation method of a nano-ZnO cellulose composite material on the basis of a NaOH-urea solution and application. The method comprises the step that in the NaOH-urea cellulose solution, the nano-ZnO cellulose composite material is prepared through in-situ compounding by adopting the hydrothermal method. According to the hydrothermal preparation method of the nano-ZnO cellulose composite material on the basis of the NaOH-urea solution, after cellulose is dissolved, hydroxyl groups on molecules of the cellulose are combined with zinc ions, and the defect that a zinc source does not easily penetrate into a carrier is overcome; in addition, the adopted NaOH-urea solvent is cheap and easy to obtain, and the hydrothermal synthesis temperature is obviously reduced. The nano-ZnO cellulose composite material contains 47.5% of ZnO and has the high removal efficiency on phenol in photodegradation wastewater. The ZnO cellulose composite material prepared through the method is cheap and environmentally friendly and has the very good practicability on phenolic wastewater treatment by serving as a photodegradation catalyst.

The invention discloses a preparation method for an energy-saving polyvinyl chloride tubular product. The preparation method comprises the steps of pouring all raw materials except for titanium dioxide and CPE into a stirring kettle, mixing the raw materials at the rotating speed of 55-70r / m for 1 hour, then putting the raw materials into a double-screw extruder, kneading the raw materials under the temperature of 140-150 DEG C for 8-10 minutes, adding the rest of the raw materials according to the weight parts, performing mixing and granulation, controlling the temperature at 150-160 DEG C, and performing a forming technology to obtain a finished product. The tubular product prepared by the preparation method disclosed by the invention is stable in quality and high in strength and has a smooth surface. The preparation technology is energy-saving, economical and environment-friendly.

The invention provides a film-forming solution. The film-forming solution is characterized by comprising the following components: 5-30wt% of alcohol-soluble protein, 1-5wt% of nano TiO2 particles, 0.1-3wt% of gelatinizing agent, 0.05-3wt% of coagulant aid, 0.1-3wt% of plasticizer, and the balance of ethanol water of which the volume ratio is 45-65%. The invention also provides a method for preparing the film-forming solution. Furthermore, the invention also provides application of the film-forming solution as a food preservation film. According to the film-forming solution provided by the invention, not only are the edibility, the safety and the stability of the preservation film improved due to the alcohol-soluble protein, but also the preservation film is degradable and free of pollution to the environment. The nano TiO2 particles are contained, so that the film-forming solution has unique barrier property and mechanical property after a film is formed, and has an antibacterial effect. In addition, the preparation method of the film-forming solution provided by the invention is simple in process, and low in cost. The preservation film not only is good in moisture resistance, but also does not become tacky after being moistened, is degradable, green and environment-friendly, can well keep the quality of the food, and prolongs the shelf life after being formed on the food surface.

The invention discloses a preparation method of a strip nano-ZnO / cellulose gel material. ZnCl2 aqueous solution is used as a solvent for cellulose and a zinc source of nano-ZnO, and the cellulose fiber of a dissolved pulp is used as a cellulose raw material. Precipitation, hydrothermal synthesis and freeze-drying, a new strip-shaped nano-ZnO / cellulose gel material was prepared. The invention skillfully uses ZnCl2 aqueous solution as the solvent of cellulose and the zinc source of nanometer ZnO, therefore, no need to add other cellulose solvents, and the preparation process is clean and environment-friendly. In addition, after the cellulose is dissolved, the hydroxyl groups on its molecules combine with zinc ions to promote the formation of nano-ZnO, and the hydrothermal synthesis temperature is also significantly reduced accordingly. Therefore, the preparation process has the advantage of energy saving.