35results about How to "Achieve chemical modification" patented technology

The invention relates to a fluorine-free superhydrophobic finishing agent containing modified nano silicon dioxide hydrosol and application thereof. The finishing agent is prepared by the following steps of: (1) mixing a precursor, an anionic surfactant and water and stirring violently at the temperature of between 20 and 50 DEG C; and (2) slowly adding ammonia water serving as a catalyst dropwise, stirring, adding long-chain alkylsiloxane serving as a modifier and stirring continually so as to obtain modified SiO2 hydrosol. The finishing agent has a stable property, avoids the pollution of an organic solvent and has high water repellency when used for performing superhydrophobic finishing on textiles.

The invention relates to a preparation method of polyester acrylate hybrid aqueous dispersion, which belongs to the field of chemical coatings, and the preparation method comprises four steps of synthesizing hydroxyl acrylate resin, preparing an intermediate, preparing polyester acrylate resin and dispersing with deionized water. The preparation method effectively combines the advantages of polyester and acrylic resin, the prepared stable dispersion can be used as the hydroxyl resin component of a dual-component polyurethane coating for preparing a high-performance waterborne dual-component polyurethane coating with hydrophilic polyisocyanate, and a coating film has excellent performance; in addition, the preparation of the dispersion does not use amine as a neutralizer, thereby avoiding the smell caused by the amine and simplifying the process; and only a small amount of cosolvent is adopted in the dispersion, and the content of an organic solvent in the coating is low.

The invention discloses a slow-release fragrance-type antibacterial super-hydrophobic processing method for decorative paper. The method comprises the steps: immersing bleached softwood pulp and bleached hardwood pulp in water, performing defibering by using a beater, starting beating, adding a titanium dioxide-kaolin composite suspension, a wet strength agent and a retention aid to the pulp, preparing sheets by using a standard paper sheet former, performing vacuum drying and moisture balancing so as to obtain decorative base paper, immersing the obtained decorative base paper in a slow-release fragrance-type antibacterial microcapsule solution, taking the immersed paper out, performing natural drying so as to obtain slow-release fragrance-type antibacterial processed decorative paper, putting hydrophobic-modification cellulose nanoparticles, methyltrimethoxysilane and water in a closed reactor for a reaction, adding the reaction product into tetrahydrofuran, performing ultrasound treatment so as to obtain a super-hydrophobic coating, spraying the coating uniformly to the slow-release fragrance-type antibacterial processed decorative paper by using a spray gun, and performing curing in an oven so as to obtain the slow-release fragrance-type antibacterial super-hydrophobic decorative paper.

The invention discloses a preparation method of a porous kieselguhr adsorbing material which is synergistically modified by hydroxyl and a proline functional group for separating heavy metal ions. According to the preparation method, porous kieselguhr is modified by using the proline functional group at low temperature, and with the synergistic effect with hydroxyl, the adsorption separation property of the adsorbing material to heavy metal ions is effectively improved. The porous kieselguhr adsorbing material which is modified by double functional groups is simple in preparation operation, low in cost, good in adsorption effect on heavy metal ions in water, and can be widely popularized and used in fields such as heavy metal ion separation and recycling.

The invention relates to a chemical modification method of coal tar pitch used for carbon fiber preparation. The operation steps of the method are as follows: dry the coal tar pitch at a temperature of 110-120°C to constant weight; mix the solvent quinoline and coal tar pitch at a volume-to-mass ratio of 3-15:1, and stir for 5-15 hours; solution; filter the mixed solution to obtain the filtrate; pour the filtrate into a reaction vessel, heat it under continuous nitrogen flow and stirring, and when it is heated to 80-120°C, add a catalyst to the filtrate according to 1-16% of the mass of coal tar pitch. The catalyst is The mixture of boron trifluoride diethyl ether and nitroaromatics is reacted at 100-180°C for 5-10 hours, and the solvent quinoline is distilled out by heating, until no quinoline solvent is distilled out, and the viscosity at 190°C is 1000-3400Pa·s Chemically modified coal tar pitch. The present invention can successfully realize the chemical modification of coal tar pitch only by using a chemical reaction catalyst, the process is simple, the modification effect is good, the modified coal tar pitch is easy to spin and carbonize, and the purpose of preparing high-quality coal pitch as a carbon fiber precursor is successfully achieved.

The invention relates to the technical field of building material preparation, in particular to a starch-based water reducing agent and a production process thereof. The starch-based water reducing agent is prepared from the following raw materials in parts by weight: 50-80 parts of starch, 4-8 parts of an oxidation reagent, 5-12 parts of an etherification reagent, 20-45 parts of sodium methallyl sulfonate, 4.5-7.0 parts of an initiator, 2.5-4.0 parts of dihydroxysuccinic acid and a proper amount of distilled water and absolute ethyl alcohol. The starch is used as a raw material for preparing the high-efficiency water reducing agent and is modified, and the modified starch contains rich macromolecular groups, so that a strong steric hindrance effect is easily formed on the surfaces of cement particles, the cement particles are more sufficiently and uniformly dispersed, and re-agglomeration of the dispersed particles is reduced. Compared with a water reducing agent sold in the market at present, the retarding and water reducing effects of the starch-based water reducing agent are more excellent. Moreover, the starch is used as the raw material, so that the production cost can be reduced, the environment can be protected, and the pollution to the environment is reduced.

The invention relates to a catalyst preparation technology and aims at providing a metal hydrides coordination catalyst and preparation and application thereof. The structural formula of an active component of the catalyst is Zn2[Co(CN)6](OR)mXn, wherein R is alkyl, aryl or acyl, X is a single valence anion, m and n are positive numbers, and m plus n is 1. The divalent Zn ions in the activated component are coordinated with inner metal trivalent cobalt ions through cyanide ions and surrounding anions OR and X at the same time to form a Co-CN-Zn-OR structure and a Zn-X structure. The activated triggering center structure of the catalyst is a definite Zn-OR bond; when the catalyst catalyzes a reaction in which epoxyalkane takes participate, due to the fact that one end of the generated polymer is an R group, the chain transfer reaction degree is reduced, and the degradation property of a product is improved; one end of the obtained polymerisate is an OR group, due to the diversity of the R group, functionalization of the end group of the polymer is achieved, and only polymer with the two ends being hydroxyls can be obtained through reported DMCC containing the Zn-OH bond.

The invention belongs to the field of nanofiber membranes, and particularly relates to a preparation method of a composite nanofiber membrane, the composite nanofiber membrane, application of the composite nanofiber membrane to enzyme immobilization and an immobilized enzyme. An electrostatic spinning solution containing chitosan is adopted for preparing the nanofiber membrane, and the membrane has a good film-forming property and an enzyme-immobilizing function; meanwhile, polypeptide nanofibers are adopted and loaded onto the membrane, in this way, the property of the membrane is further improved, and the enzyme-immobilizing property of the membrane is improved.

The invention relates to a method for preparing a highly grafted silanization modified clay/rubber nanocomposite material. According to the method, a silane coupling agent is treated with an acid to make a surface have more active silicon hydroxyl groups, and then is added to a clay slurry, the acid in the system can simultaneously activate the surface of clay to produce reactive hydroxyl groups,and a grafting reaction is completed in an aqueous phase; and a aqueous suspension of silane coupling agent-grafted clay is stirred and mixed with rubber latex, and the clay/rubber nanocomposite material is obtained by flocculation, washing, drying, mixing and a vulcanization process. By increasing hydrolysis of the silane coupling agent and increasing the amount of reactive hydroxyl groups on thesurface of the clay, the method enables the grafting amount of the silane coupling agent to be increased, thereby enhancing interaction between the clay and rubber, and mechanical properties of the rubber is increased.

The invention belongs to the field of electrochemical catalysis, and specifically relates to a preparation method of an oxygen evolution reaction catalyst. The method comprises the following steps: S1, dispersing a compound containing more than two transition metals in an aqueous solution; S2, adding a peroxide; S3, performing heating treatment; and S4, cooling the heated mixture, and performing centrifugation or filtering separation to obtain a solid, which is the oxygen evolution reaction catalyst having high activity. According to the method, a transition metal compound undergoes surface modification through a chemical oxidation manner, so that more active sites are produced on the surface of the transition metal compound, and the catalytic activity of the oxygen evolution reaction is improved. Compared with an electrochemical oxidation method which is mostly adopted at present, chemical oxidation is convenient to operate, and massive application and regulation of surface sites of a material are easy to realize. The preparation method is high in efficiency, quality and purity, low in cost, and convenient to control, and is non-toxic. The preparation method is particularly suitable for application to massive production.

The invention belongs to the technical field of waste utilization and lithium ion battery material preparation, and particularly discloses a method for preparing a thin-layer graphene negative electrode active material from antibiotic bacterium dregs, which comprises the following steps of: carrying out hydrothermal liquefaction on an aqueous solution containing antibiotic bacterium dregs and alkali, and carrying out solid-liquid separation to obtain a bacterium dreg solution; adding a transition metal source into the bacterium dreg solution, carrying out dehydration treatment after liquid phase mixing, and then carrying out heat treatment, the heat treatment comprising first-stage heat treatment and second-stage heat treatment which are carried out in sequence, the temperature of the first-stage heat treatment being 400-600 DEG C, the temperature of the second-stage heat treatment being 700-900 DEG C, and the heating rate in the heat treatment process being 2-10 DEG C/min; and washingand drying a product obtained by heat treatment to obtain the thin-wall graphene. According to the invention, efficient utilization of the waste material is realized, and the graphene negative electrode material with high thin wall and high electrochemical performance is co-produced.

The invention discloses a self-flame retardant PBT composite material and a preparation method thereof. The self-flame-retardant PBT composite material is prepared from the following raw materials in parts by mass: 40 to 50 parts of terephthalic acid, 45 to 55 parts of 1, 4-butanediol, 15 to 25 parts of pyromellitic acid, 3 to 10 parts of guanidine sulfamate, 2 to 4 parts of amino trimethylene phosphonic acid, 1 to 2 parts of a catalyst and 10 to 15 parts of functionalized layered double hydroxides. The preparation method comprises the following steps: S1, mixing terephthalic acid, 1, 4-butanediol and a catalyst, carrying out pre-esterification reaction for 2-3 hours under the conditions of 0.1 MPa and 200-220 DEG C, then adding pyromellitic acid, guanidine sulfamate and amino trimethylene phosphonic acid, heating to 245-270 DEG C, and carrying out stirring reaction for 1-1.5 hours; and S2, vacuumizi1ng the reaction system in the S1 to 50-100 Pa, carrying out condensation polymerization at 240-255 DEG C for 3-6 hours, then adding the functionalized layered double-metal hydroxide, carrying out stirring reaction at 250-270 DEG C for 1-2 hours, and cooling and curing. According to the method disclosed by the invention, a flame-retardant substance is embedded into a PBT molecular chain, so that microcosmic molecular modification is realized, the PBT material is endowed with a self-flame-retardant characteristic, the problem of phase layering is avoided, and the mechanical strength and the mechanical property of the PBT material are greatly improved.

The invention relates to the technical field of optical lens preparation, in particular to an anti-blue-ray mobile phone camera lens and a preparation process thereof. The anti-blue-ray mobile phone camera lens is prepared from the following raw materials in parts by weight: 95 to 100 parts of polycarbonate, 0.16 to 0.38 part of metal oxide, 0.14 to 0.28 part of nano powder, 0.25 to 0.45 part of modified mica powder, 0.025 to 0.032 part of diisopropyl peroxydicarbonate, 0.03 to 0.12 part of ultraviolet absorbent, 0.6 to 1.5 parts of blue light absorbent, 0.03 to 0.08 part of antistatic agent and 0.015 to 0.023 part of toner. The mobile phone camera lens prepared by the preparation method not only has good light transmission, but also has a good absorption effect on ultraviolet rays and blue light; in addition, the anti-blue-ray mobile phone camera lens has good anti-blue-ray performance, the blocking effect of the camera lens on harmful blue ray is effectively improved, and harm of ultraviolet light and blue ray to the body of a user is reduced; in addition, the camera lens also has excellent anti-ultraviolet capability so that the aging rate of the camera lens is effectively reduced, and the service life of the camera lens is prolonged.

The invention belongs to the technical field of two-dimensional nano materials, and particularly relates to a surface modification method of an MXene material, in particular to an MXene surface modification method based on anion coordination competition in a molten salt environment. The preparation method specifically comprises the following steps: mixing a precursor MAX phase material, Lewis acid molten salt, end-group-related elemental element powder or an end-group-related alloy phase and inorganic salt, and carrying out high-temperature reaction to prepare the MXene material. The method disclosed by the invention is simple, efficient and environment-friendly, multiple defects caused by using a hydrofluoric acid solution with high toxicity and high risk as an etching agent to prepare MXene are avoided, meanwhile, chemical modification of the surface of the MXene material is realized, physical and chemical properties of the MXene material can be effectively regulated and controlled through end group modification, and functional application and large-scale preparation of MXene are expected to be further promoted.