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

The invention relates to the technical field of organic chemical industry, in particular to the preparation of highly dispersed modified lignin for functional modification of rubber materials, and also to its application. The lignin used is the black liquor of papermaking pulping, no pretreatment is required, the processing links are reduced, and the energy consumption is reduced. The black liquor is modified by methylolation by adding alkoxyl donors, reducing the polarity of phenolic hydroxyl groups, and then adding long chain Fatty acids can coat and isolate lignin through polar attraction, reduce the mutual adhesion between lignin particles, and improve the dispersion performance of modified lignin products. After spray drying, stir and heat to make some carboxylic acid groups and hydroxyl groups The esterification of the methyl group further reduces the surface polarity of the lignin.

The invention discloses a preparation method and application of a multifunctional zinc negative electrode protective layer rapidly grown in situ. The method comprises the following steps: 1. preparing a surface modification solution A; 2. preparing a surface modification solution B; 3. preparing a surface modification solution B; Surface modification solution A is slowly poured into surface modification solution B under stirring; 4. Prepare rust removal solution; 5. Soak the zinc metal pole piece in the rust removal solution in step 4; 6. Seal the zinc obtained in step 5 One side of the pole piece; 7. Soak the zinc pole piece obtained in step 6 into the modification solution in step 3 to obtain a zinc negative electrode with a modification layer. In the present invention, an interfacial layer tightly combined with the zinc substrate is formed in situ on the surface of the zinc metal negative electrode by the chemical deposition method. The modified layer has uniform thickness and uniform distribution, which can effectively eliminate the surface defects of the zinc negative electrode, guide the uniform deposition of zinc ions, and suppress dendrites. growth, and hinder the precipitation of hydrogen, which is conducive to the stable cycle of the zinc anode, thereby improving the electrochemical performance and cycle life of the battery.

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 the application of a porous ion-conducting membrane with a gradient distribution of pore diameters in an alkaline zinc-iron liquid flow battery. This type of film is prepared by blending organic polymer resin and inorganic particles that can react with acid to generate gas, and then undergo phase inversion in acid solution. During the film forming process, the solvent of the casting solution is exchanged with the non-solvent to form a pore structure. At the same time, after the protonic acid in the non-solvent enters the casting solution, it reacts with the inorganic particles in the casting solution to generate gas, so that the The process produces a porous ion-conducting membrane with a gradient distribution of pore sizes. This kind of porous ion-conducting membrane with gradient distribution of pore diameter has a simple process, environmentally friendly process, controllable pore diameter and porosity, and is easy to realize mass production. Compared with the original porous membrane, this kind of porous ion-conducting membrane with gradient distribution of pore size can control the pore structure by controlling the content of inorganic particles and the concentration of acid in the non-solvent, and the assembled flow battery has good battery performance.

The invention relates to a preparation method and application of a carbon nanofiber, tin disulfide, tin dioxide and sulfur composite material with a heterojunction structure, and belongs to the technical field of an energy material. The method comprises the following steps: 1, dissolving tin tetrachloride, thioacetamide and carbon nanofiber into polypropyl alcohol and performing hydrothermal reaction to obtain a carbon nanofiber, tin disulfide and tin dioxide composite material with the heterojunction structure; 2, dipping the composite material obtained in the step 1 into a sulfur solution, taking out after 5 minutes, vacuum-drying and calcining at high temperature to obtain the carbon nanofiber, tin disulfide, tin dioxide and sulfur composite material with the heterojunction structure. The preparation method and the application of the carbon nanofiber, tin disulfide, tin dioxide and sulfur composite material with the heterojunction structure have the following advantages: the composite material has special interface effect, can effectively increase electrode surface electron and ion transmission speed and is favorable for realize efficient utilization of the sulfur and obtainingthe cyclic stable lithium sulfur battery. The composite material can be prepared by directly utilizing a one-step hydrothermal method, the preparation method is simple and practical, and the components are controllable.

The invention relates to a preparation method and application of a graphene composite metal boride and sulfur composite nano material and belongs to the technical field of energy materials. The preparation method comprises the following steps: dissolving a reducing agent and NaOH in deionized water under inert gas protection conditions, dissolving metal salt in deionized water and separately placing obtained two solutions in ice-water baths; slowly adding a metal salt aqueous solution into a reducing agent solution under inert gas protection conditions, stirring for 30 minutes and calcining for 2-10 hours at a high temperature to obtain metal boride; then performing a hydrothermal reaction on grapheme and the metal boride to obtain graphene compound metal boride; and mixing the graphene compound metal boride with elemental sulfur, and heating and calcining for 12-24 hours at a temperature of 150-180 DEG C to obtain the graphene composite metal boride and sulfur composite nano material.The preparation method and the application of the graphene composite metal boride and sulfur composite nano material, provided by the invention, have the advantages that the graphene compound metal boride has very high lithium polysulfide adsorption capacity, and the stability of a lithium-sulfur battery can be improved; and the cost of preparation raw materials is low, the preparation process issimple, and the preparation process is clean and environmentally-friendly.