11results about How to "High hydroxyl content" patented technology

The invention discloses a hydroxylation modified ceramic particle, a photocuring ceramic slurry and a preparation method thereof.The preparation method of the hydroxylation modified ceramic particle comprises the following steps that after ceramic powder is flatly laid, plasma working gas is introduced into the ceramic powder, a plasma power source is started to generate plasma, the ceramic powder is treated for set time, and the photocuring ceramic slurry is obtained; and uniformly spreading the ceramic powder again, and continuously treating for a set time to obtain the hydroxylation modified ceramic particles. The method for modifying the ceramic particles based on DBD plasma hydroxylation is simple in process, low in cost and easy to regulate and control, the hydroxylation degree of the ceramic particles can be achieved only by adjusting discharge voltage, frequency, treatment time and ventilation flow, no solvent is involved in the hydroxylation modification process of the ceramic particles, almost no waste is generated, and the method is suitable for industrial production. And original ceramic particles are not polluted.

The invention relates to the field of motor vehicle exhaust purification, and particularly discloses an environment-friendly low-temperature vehicle tail gas treatment fluid and a preparation method thereof. The environment-friendly low-temperature vehicle tail gas treatment liquid is prepared from the following raw materials in percentage by weight: 32.5% of vehicle-grade high-purity urea, 3 to 5% of polyethylene glycol, 2 to 3.5% of glycerol, 5 to 6.5% of octadecanol polyoxyethylene ether, 6.5 to 10% of bacterial cellulose aerogel nano powder and the balance of ultrapure water. The tail gas treatment liquid is safe to use, lower in freezing point, suitable for being used in winter in northern cold regions and better in tail gas treatment effect.

The invention discloses a preparation process of phosphate glass with low hydroxyl content and high uniformity. A secondary melting process is mainly adopted, uniform and bubble-free phosphate glass is obtained through high-temperature melting, glass dewatering is performed through secondary in-tube atmosphere low-temperature melting, and free forming of the glass in a furnace is performed by adopting a crucible which is not mutually wetted with the glass to reduce glass pouring stripes. In the process, the volatilization of the components is reduced by using a lower secondary melting temperature, the water removal of the glass is performed by introducing gas, and meanwhile, the glass is freely formed in the crucible by adopting the crucible which is not moistened with the molten glass, so that the pouring stripes of the glass are reduced, and the optical uniformity of the glass is improved.

This invention discloses a method for increasing the hydrophilicity of titanium / titanium alloy dental implants using an electrochemical approach, comprising the following steps: S1, pretreating the titanium / titanium alloy dental implant to obtain a pretreated titanium / titanium alloy dental implant; S2, sandblasting and drying the pretreated titanium / titanium alloy dental implant obtained in S1 to obtain a treated titanium / titanium alloy dental implant; S3, acid etching the treated titanium / titanium alloy dental implant obtained in S2 to obtain an acid-etched titanium / titanium alloy dental implant; S4, electrochemical activation treatment to obtain an activated titanium / titanium alloy dental implant; S5, continuously rinsing the activated titanium / titanium alloy dental implant obtained in S4 with purified water for 20 seconds and drying it in a vacuum drying oven. This invention uses cyclic voltammetry (CV) electrochemically to activate the titanium / titanium alloy implant, thereby enhancing its hydrophilicity.

The invention discloses a chemical plating method for improving the surface hardness of an aluminum alloy. The chemical plating method comprises the following preparation steps: (1) preparing a nano powder solid phase; (2) preparing plating solution doped particles; (3) pickling to obtain a pickled aluminum alloy plate; (4) modifying to obtain an aluminum alloy plate surface; (5) a plating solution is prepared, the plating solution comprises doped particles, thiourea, nickel sulfate, copper sulfate, sodium hypophosphite, ammonium acetate, trisodium citrate and lauryl sodium sulfate, and a solvent is water; and plating to obtain the aluminum alloy with high surface hardness. According to the process, the surface of the aluminum alloy is plated with a layer of doped particle-Ni-Cu-P composite coating, the corrosion resistance and the wear resistance of the aluminum alloy are remarkably improved through the coating, the durability is improved, and the maintenance cost is reduced.

The present application relates to a polyhydroxy chelating resin and a preparation method thereof and a boron removal method. The preparation method of the polyhydroxy chelating resin comprises the following steps: subjecting an amino resin having a structure as shown in the general formula (I) and an aldose having a structure as shown in the general formula (II) to a nucleophilic addition reaction to prepare a Schiff base intermediate having a structure as shown in the general formula (III); subjecting the Schiff base intermediate and a reducing agent to a reduction reaction to prepare a polyhydroxy chelating resin having a structure as shown in the general formula (IV); wherein n is a positive integer; R is absent or is selected from substituted or unsubstituted C 1 ~C 9 The polyhydroxy chelating resin prepared in the present application exhibits excellent adsorption capacity and adsorption rate, and has a wide pH application range, and has a good boron removal effect under different pH conditions.

EVOH material with high hydroxyl content, preparation method and application, hydroxyl molar content of 16-98%, is a random or block organic polymer material with a molecular weight of 1000-100000000 g / mol containing hydroxyl, carboxyl, ester, ether bond or polyethylene chain in accordance with general formula (1). In the presence of organic alcohol metal solution and organic epoxy compound solution, polyvinyl acetate (PVAc), EVA, ethylene / MMA copolymer or ethylene / MA copolymer (EMA) or ethylene / methacrylic acid copolymer or PAM are dissolved in alcohol for alcoholysis, and the prepared EVOH material has high temperature resistance, non-toxicity, excellent water barrier performance, moisture barrier performance, gas barrier performance, etc., easy processing, easy recovery and other characteristics, is the first choice of barrier packaging materials, film materials, etc., and is also particularly suitable for high temperature oil displacement agents for tertiary oil recovery. The method of the present invention is simple, low in cost, good in effect, low in energy consumption, pollution-free, and no carbon dioxide is generated during the production process.

The application relates to the field of implant technology, and particularly relates to a dental implant with a high-bioactivity surface coating and a preparation method thereof; in order to improve the bioactivity of a dental implant and improve the healing condition of the dental implant after implantation, the dental implant surface is first subjected to sand blasting treatment for roughening and acid liquid and alkali liquid immersion treatment, the content of hydroxyl groups on the surface of the dental implant is increased, the hydrophilicity of the dental implant is improved, the content of active groups on the surface of the dental implant is increased, and on this basis, a polydopamine coating containing exosome microcapsules is introduced into the surface of the dental implant, so that the antibacterial performance of the dental implant is improved and the proliferation of cells is induced, the implantation of the dental implant is accelerated, and the bioaffinity of the dental implant is greatly improved.

The invention provides a preparation method for extracting bamboo reed cellulose and MXene composite regenerated fibers based on oxidation-ultrasonic coupling, and belongs to the field of biomass-based functional fiber materials.The preparation method comprises the steps that after bamboo reed raw materials are cooked, the pH value of a system is adjusted, the liquid carrying rate is controlled, oxidation and ultrasonic pretreatment is conducted, the raw materials are purified, and the bamboo reed cellulose and MXene composite regenerated fibers are obtained; bamboo reed cellulose is obtained; a composite solution system is adopted for dissolving the spinning solution, and a uniform spinning solution is prepared; the preparation method comprises the following steps: uniformly dispersing MXene in a spinning solution in proportion, and preparing the bamboo reed-based MXene composite regenerated cellulose fiber by taking a buffer solution as a coagulating bath and adopting wet spinning. The invention solves the problems of high energy consumption, large reagent dosage, low yield and easy damage of cellulose structure in the existing bamboo reed cellulose extraction, and the problems of insufficient cellulose purity, poor MXene dispersity, poor interfacial compatibility, poor spinning solution stability and forming effect and the like in the MXene composite regenerated fiber preparation.

The invention provides a preparation method of a lignin-based polyurethane slow-release nitrogen fertilizer, which comprises the following steps: separating and extracting lignosulfonate from papermaking industry waste black liquor by adopting a membrane filtration method, liquefying lignin, polyethylene glycol and ethylene glycol according to a certain proportion, introducing a hydrophobic group through hydroxyl-terminated polydimethylsiloxane, and preparing the lignin-based polyurethane slow-release nitrogen fertilizer. Reacting with castor oil and isophorone diisocyanate to prepare polyurethane, and coating and curing the polyurethane on the surfaces of urea particles in a rotating pot at a certain temperature and rotating speed to prepare the lignin-based polyurethane slow-release nitrogen fertilizer. The polyurethane is wide in raw material source, the preparation method is simple, the bio-based content is high, and the prepared slow-release nitrogen fertilizer is good in slow-release performance.

The application discloses a kind of super-hydrophobic unit cell powder, which is composed of particles in unit cell structure; each unit cell particle has a shell of super-hydrophobic round diatomite, and the round diatomite has a hollow porous structure; the hollow cavity of the diatomite is filled with super-hydrophobic inorganic nanoparticles and corrosion inhibitor filled in the gap between the inorganic nanoparticles, and a membrane for sealing the pores of the diatomite shell is also provided. The application also discloses a preparation method of the super-hydrophobic unit cell powder and its application in preparing a composite anticorrosive coating. During the formation of the coating, the unit cell particles are connected to the resin through chemical cross-linking by the hydroxyl groups on the surface of the unit cell particles, and the unit cell particles are connected to the resin through chemical bonding, which can significantly improve the compatibility and bonding force of the unit cell particles and the resin. By increasing the spraying pressure during spraying, the vertical density of the coating is improved, and the coating has good mechanical strength and long-term corrosion resistance due to the synergistic effect of multiple factors.