46results about How to "The preparation process is clean and environmentally friendly" patented technology

The invention discloses a preparation method for a strip-type nano ZnO/cellulose gel material. A ZnCl2 aqueous solution is used as a solvent for cellulose and a zinc source for nano ZnO; dissolving pulp cellulose fibers are cellulose raw materials; the strip-type nano ZnO/cellulose gel material is prepared by dissolving, co-separation, hydrothermal synthesis and freeze drying. As the ZnCl2 aqueous solution is ingeniously used as the solvent for the cellulose and the zinc source for nano ZnO, other cellulosesolvents are not needed to be added, and the preparation technology is clean and environment-friendly; furthermore, after cellulose is dissolved, hydroxyl on the molecules of the cellulose is combined with zinc ions, so that generation of nano ZnO is promoted, and the hydrothermal synthesis temperature is correspondingly obviously reduced; therefore, the preparation technology has the advantage of energy conservation.

The invention discloses nano ZnO/cellulose gel particles and a preparation method thereof. According to the nano ZnO/cellulose gel particles, cellulose gel is used as a core, and the outer layer is loaded with nano ZnO. According to the preparation method, a ZnCl2 aqueous solution is used as a solvent for cellulose and a zinc source for nano ZnO; dissolving pulp cellulose fibers are cellulose raw materials; the nano ZnO/cellulose gel particles are prepared by dissolving, co-separation, hydrothermal synthesis and freeze drying. As the ZnCl2 aqueous solution is ingeniously used as the solvent for the cellulose and the zinc source for nano ZnO, other cellulosesolvents are not needed to be added, and the preparation technology is clean and environment-friendly; furthermore, after cellulose is dissolved, hydroxyl on the molecules of the cellulose is combined with zinc ions, so that generation of nano ZnO is greatly promoted, and the hydrothermal synthesis temperature is correspondingly obviously reduced; therefore, the preparation technology has the advantage of energy conservation.

The invention relates to a hierarchical porous polylactic acid material and a preparation method thereof, belongs to the technical field of biodegradable polymer porous materials and solves the technical problems that an existing porous polylactic acid material is single in pore diameter, poor in mechanical strength and poor connectivity among pores and a pore structure is difficult to control dueto the introduction of an organic solvent in a preparation method of the existing porous polylactic acid material. The hierarchical porous polylactic acid material disclosed by the invention is prepared by taking polylactic acid as a matrix, the matrix is irregularly distributed with a plurality of micropores and macropores which are in a form of olive-shaped pores or round pores, and long axes of the olive-shaped pores are parallel when both the micropores and the macropores are in the form of the olive-shaped pores. The porous polylactic acid material simultaneously has the micropores and the macropores, the connectivity among the pores is relatively good, the micropores can be interconnected with the macropores, the porosity can reach up to 80% or above, and the mechanical properties are good.

The invention discloses a catalyst for oxidizing-synthesizing glutaric dialdehyde with cyclopentene and a preparation method thereof. The catalyst adopts a Ti-MSU type mesoporous molecular sieve as a carrier and is a supported catalyst supporting tungstic oxide on surface; the carrier Ti-MSU type mesoporous molecular sieve has a three-dimensional vertical-crossing arrangement vermiform pore canal structure, bigger aperture and higher specific surface; and the mol ratio of silicon to titanium is 1:0.01 to 1:0.04; and the content of tungstic oxide adopted as the active component accounts for 1 to 15 percent of the mass of the catalyst. The catalyst has the characteristics of high activation, better selectivity, mild reaction condition for catalyst preparation and glutaric dialdehyde synthesis with the catalyst, low cost, long service life, better industrial application prospect and environment-friendly property in the whole process from catalyst preparation to glutaric dialdehyde synthesis.

The invention relates to the technical field of organic chemicals, in particular to preparation of highly dispersed modified lignin for functional modification of rubber materials, and also relates toan application of the highly dispersed modified lignin. The lignin used is a papermaking pulping black liquid, pretreatment is not needed, processing links are reduced, and energy consumption is reduced. An alkoxy donor is added for hydroxymethylation modification on the black liquid, and polarity of a phenolic hydroxyl group is reduced; long chain fatty acid is added, the lignin is coated and isolated by polarity attraction, mutual adhesion between lignin particles is reduced, the dispersion performance of the modified lignin product is improved, part of carboxylic acid groups are esterifiedwith hydroxymethyl by stirring and heating after spray drying, and the surface polarity of the lignin is further reduced.

The invention discloses a preparation method of a bacterial cellulose-based aqueous zinc ion battery diaphragm material, and the method comprises the following steps of 1, adding montmorillonite into deionized water, and mechanically stirring and uniformly dispersing; adding a small molecule substance into the mixture solution, stirring at room temperature, and stripping the montmorillonite to obtain a suspension containing the sliced montmorillonite; 2, carrying out centrifugal separation on the suspension, washing with deionized water for multiple times, and centrifuging to obtain a sliced montmorillonite solid precipitate; 3, carrying out freeze drying on the sliced montmorillonite solid precipitate to obtain the sliced montmorillonite powder; 4, uniformly dispersing the sliced montmorillonite powder and the bacterial cellulose homogenate in the deionized water to obtain a homogeneous suspension; and 5, filtering the homogeneous suspension to obtain a wet diaphragm, and carrying out vacuum drying to obtain an MMT/BC diaphragm. The prepared MMT/BC diaphragm has the properties of high porosity, excellent mechanical strength, high liquid retention capacity and the like, and the electrochemical performance of a zinc negative electrode in an aqueous zinc ion battery can be improved.

The invention provides a synthesis method of trimethoxyboroxine. Borane methyl sulfide serves as a raw material to react with carbon dioxide, trimethoxyboroxine is obtained, borane methyl sulfide is added into a Schlenk reaction bottle at the temperature of -60 - -80 DEG C, THF (tetrahydrofuran) is added into the Schlenk reaction bottle to be mixed for 15-20 seconds under the pressure of 0.5-0.7Pa, carbon dioxide is guided into the reaction bottle, the pressure is controlled to be 90-100kPa, then heating is conducted till the temperature reaches 70-80 DEG C, it is detected that no borane methyl sulfide exists, the reaction is ended, and trimethoxyboroxine is obtained. The preparation method is simple, the preparation technology is clean and environmentally friendly, the preparation processis moderate and stable, the yield of the prepared trimethoxyboroxine is high, the purity is high, the water content is low, and the acid value is low.

The invention discloses a low dielectric and low loss boride LTCC material and a preparation method thereof, the chemical expression of the boride LTCC material is ABB5O9, in the formula, A is Li or Na; b is Sr, Ba or Ca. The preparation process of the boride LTCC material sequentially comprises the following steps: preparing ABB5O9 powder by a hydrothermal method, carrying out ball milling, carrying out compression molding, and sintering to form ceramic. The main crystal phase of the prepared ABB5O9-based LTCC material is ABB5O9 (A = Li and Na, and B = Sr, Ba and Ca) single phase, and the ABB5O9-based LTCC material has the advantages of low raw material cost, low sintering temperature (700-825 DEG C), low dielectric constant (4.3-8.5), high Qf value (10500-58850 GHz), simple preparation process, good reproducibility and the like, can solve the time delay problem of microwave signals in high-frequency communication, improves the stability of microwave signal transmission, and is very suitable for being used as an LTCC microwave substrate.

The invention discloses an application of a porous ion conduction membrane with gradient distribution of pore diameters in an alkaline zinc-iron flow battery. The membrane is prepared by blending organic polymer resin and inorganic particles capable of reacting with acid to generate gas and then carrying out phase inversion in an acid solution. In the membrane forming process, a membrane casting solution solvent exchanges with a non-solvent to form a pore structure, and meanwhile, protonic acid in the non-solvent reacts with inorganic particles in the membrane casting solution to generate gas after entering the membrane casting solution, so that a porous ion conduction membrane with pore diameters in gradient distribution is generated in the membrane forming process. The porous ion conduction membrane with gradient distribution of pore diameters is simple in process, environment-friendly in process and controllable in pore diameter and porosity, and batch production is easy to realize. Compared with an original porous membrane, the porous ion conduction membrane with gradient distribution of pore diameters can control the pore structure by controlling the content of inorganic particles and the concentration of acid in a non-solvent, so that the flow battery assembled by the porous ion conduction membrane has good battery performance.

The invention discloses a regenerated cellulose microsphere containing flower-like nanometer ZnO and a preparation method thereof. According to the novel regenerated cellulose microsphere, the thickness of petaline nanometer ZnO is 100-200 nm, and the diameter of the regenerated cellulose microsphere is 2-4 mm. According to the preparation method, a ZnCl2 water solution is adopted as a solvent forcellulose and a zinc source of nanometer ZnO, and dissolving pulp cellulose fibers are adopted as the raw materials of cellulose and subjected to low-temperature pretreatment, dissolution, injectioninto a ball shape, in-situ synthesis and freeze drying to prepare the regenerated cellulose microsphere containing flower-like nanometer ZnO. A preparation process is clean, environmentally friendly and capable of saving energy; through in-situ synthesis, the regenerated cellulose microsphere containing flower-like nanometer ZnO is prepared without a hydrothermal reaction or heating, flower-like nanometer ZnO is mainly distributed in the regenerated cellulose microsphere and cannot shed, and the regenerated cellulose microsphere has wide application in light-catalyzed reactions.