32results about How to "Choose from a wide range of sources" patented technology

The invention discloses an epoxy system for bio-based electric insulation and a preparation method of the epoxy system. Vegetable oil modified epoxy resin and an anhydride curing agent containing one or more groups of an epoxy group, a hydroxyl group, a carboxyl group and a phenolic hydroxyl group are used respectively to prepare the epoxy system for bio-based electric insulation with low cost, good product stability, wide application range, simple technology, no pollution, no wastewater, excellent mechanical properties, improved glass transition temperature and good crack resistance.

The production process of the transparent leather disclosed by the present invention is divided into four steps: 1. The bare leather after deliming and softening is fully washed with water until the total ash content is less than 0.5%, and then drummed for 30 minutes, and weighed as the following operation material reference; 2. Dissolve multifunctional amphiphilic substances such as surfactant or leather fatliquoring agent with appropriate amount of water and add them to the drum, then cast the skin and rotate for at least 30 minutes; 3. Dissolve or dilute the acid or alkali with appropriate amount of water and add to the drum gradually , rotate the drum for at least 10 minutes after each addition, and continue to rotate for at least 15 minutes after adding all acids or alkalis, and control the pH value of the bath solution to 3.5‑5.5 or 9.5‑11.5; 4. Stretch the plate when it is not higher than 35 °C After drying, the production of transparent leather is completed. The equipment and materials used in the method disclosed by the invention are widely used by tanning enterprises, and the material type, dosage and processing parameters can be adjusted according to product requirements, and the method has strong practicability. At the same time, during the production process, the bare leather no longer undergoes violent expansion, and there will be no production accidents of rotten leather. The operation is simple and the risk is small.

The invention relates to a preparation method of bonded ferrite magnetic powder. The method adopts a strontium-containing compound and / or a barium-containing compound to be mixed with iron red to obtain a mixture, and the mixture is sintered to obtain a sintered material, and the obtained The sintered material is ground and passed through a sieve to obtain a coarse powder, and the coarse powder is finely ground into a slurry to obtain a fine powder, and then the alcohol amine mixture is added to the fine powder and mixed uniformly to obtain a ferrite magnetic powder, and finally the The obtained ferrite magnetic powder is annealed to obtain bonded ferrite magnetic powder. The method of the invention shortens the process route (without pickling), has low requirements on the purity of the raw materials (especially the chlorine content), has wider selection sources of raw materials, and is less difficult to control the production process, thereby greatly saving costs. The bonded ferrite magnetic powder prepared by the method of the present invention has high magnetic properties: its residual magnetic flux density is as high as 273mT, its intrinsic coercive force is as high as 310kA / m, and its maximum magnetic energy product is as high as 13.8kJ / m 3 .

A method for alkali-activated modified enzymatic lignin, according to the mass ratio of enzymatic lignin: alkali catalyst: distilled water is 1.0: (0.1-2.0): (5.0-10.0), lignin is completely dissolved in alkaline solution, and then pour it into a hydrothermal reaction kettle. After the reaction is completed, adjust the pH to 1.0 with HCl, precipitate, filter, wash and dry to obtain pure activated enzymatic lignin. The present invention selects biomass refined lignin with low price, i.e. enzymatic lignin, as a raw material, and performs alkali activation modification on it, and the activated lignin will expose more active functional groups such as phenolic hydroxyl groups, increasing its water solubility. sex. At the same time, the molecular weight is reduced, which is conducive to improving the reactivity with formaldehyde and replacing phenol with a higher proportion. It is of great significance to realize the development and utilization of lignin, a huge renewable resource.

The invention discloses a cigarette filter stick filling specific paper containing regenerative protein based fiber and a preparation method thereof. The specialty paper contains 10-100% of regenerative protein based fiber, 0-60% of hard wood pulp fiber, and 0-90% of soft wood pulp fiber. The preparation method of the specialty paper comprises the following steps: cutting the regenerative protein based fiber into 0.5-5.0mm, and grinding into pulp to obtain the pulp of the regenerative protein based fiber; evenly mixing and blending the pulp of the regenerative protein based fiber with one or several of the regenerative protein based fiber and the soft wood pulp fiber which are respectively prepared in a pulp blending pool; papermaking and shaping by a paper machine; after dehydration and one-time drying, coating the functional accessory ingredient on the paper surface according to 1.0-10wt% of dry paper; and obtaining the specialty paper containing regenerative protein based fiber after secondary drying. The functional accessory ingredient is one or more of a macromolecule material of a water-soluble derivate or a tobacco leaf extract or tobacco sweet. According to the invention, the use ratio of fiber material is improved, paper quality is improved, influence on the taste of cigarettes is lightened, and the specialty paper is easy to degrade.