31results about How to "Improve the problem of easy reunion" patented technology

The invention provides a composite material of silver-silver halide supported iron nanometer minerals, and a preparation method for the composite material of the silver-silver halide supported iron nanometer minerals, and relates to the field of environmental wastewater pollution control. The preparation method comprises the following steps: adding the iron nanometer minerals into a silver nitratesolution to obtain a first mixed solution; adding an alkali metal halide solution for enabling silver nitrate to completely form silver halide precipitates into the first mixed solution, so as to obtain a second mixed solution; adding a hole trapping agent into the second mixed solution, and carrying out a photoreduction reaction on a part of silver halide with ultraviolet light to generate elemental silver, so as to obtain a third mixed solution; and carrying out freeze-drying on the third mixed solution after centrifugally washing repeatedly. The preparation method is low in cost and high in recycling rate, and can lower the wastewater treatment cost. The prepared composite material has the advantages of uniform particle size, less agglomeration, high dispersibility and the like, can effectively remove organic pollutants in water under visible light, and further is high in times of repeated use and low in iron dissolving-out quantity to avoid secondary pollution, thereby being an environmentally-friendly and economical process technology.

The invention discloses a preparation method and application of a magnetic nanocomposite catalyst with a core-shell structure, comprising the following steps: S1, comprising Fe 2+ Metal salt X and containing Co 2+ Dissolve the metal salt Y in deionized water, stir evenly, to the mixed solution A; S2, remove the dissolved oxygen in the mixed solution A by ultrasonic vibration or suction filtration, and obtain the mixed solution B; S3, add the NaOH solution dropwise to the mixed solution In liquid B, mixed liquid C is obtained; in S4, the mixed liquid C is refluxed, heated and stirred, and the product is taken out after standing still, and washed multiple times with deionized water and absolute ethanol, then dried and ground to obtain powdered magnetic cobalt Iron hydroxide; S5, the powdered magnetic cobalt-iron hydroxide is calcined, ground and sieved to obtain the 3 o 4 For the shell, CoFe 2 o 4 A magnetic nanocomposite catalyst with a core-shell structure as the core. The preparation process is simple and easy to operate, and it can realize the microscopic control of the composite catalyst morphology, form a core-shell structure, and help the electron transfer in the catalytic reaction process.

The invention provides a polyaspartic acid ester finishing paint and a preparation method thereof. First, a glass flake is subjected to graft modification to enhance the interfacial adhesion between the glass flake and resin, and at the same time, the problem of high possibility of agglomeration of the glass flake is solved. By adding the modified glass flake to the resin, the bonding force between the glass flake and the resin can be improved, a cured film layer forms a solid integral film, and a polyaspartic acid ester finishing paint with good weather resistance, excellent mechanical properties, and good acid and alkali resistance, aging resistance, corrosion resistance and construction performance can be prepared.

The invention discloses an in-situ titanium dioxide-coated lignin composite particle and its preparation and application. In the present invention, the three-dimensional network amorphous lignin is self-assembled to obtain stable lignin colloidal balls with a certain size, and then the hydrolysis rate of tetrabutyl titanate is controlled by adding an inhibitor, so that tetrabutyl titanate is dissolved in lignin A titanium dioxide coating layer without photocatalytic activity is formed on the colloidal spheres, and the obtained titanium dioxide-coated lignin composite particles have better ultraviolet protection effect. The preparation process of the present invention is green and efficient, promotes the application of natural polymer lignin in the field of daily chemicals, and simultaneously solves the problems of dark lignin color, easy agglomeration, photocatalytic activity of physical sunscreens, etc., and has broad application prospects.

The invention relates to a preparation method for a magnetic composite material, and particularly to a preparation method for a high-performance magnetic Fe3O4 / polyurethane elastomer composite material, which solves the problems that the mechanical performance and magnetic performance of a current magnetic polyurethane elastomer composite material are difficult to improve simultaneously, and magnetic particles are smaller in filling amount and poor in dispersity, the scheme is that: 1) preparing Fe3O4 with FeCl2.4H2O, FeCl3.6H2O, a surface active agent and NaOH; adding an organic solvent for magnetic separation and purification; adding the organic solvent for ultrasonic dispersion so as to preparing an organic magnetic liquid; 2) adding tetrahydrofuran ether diol, and using anhydrous acid to adjust pH; adding toluene diisocyanate to obtain polyurethane prepolymer; adding chain extender, vacuumizing, defoaming and adding a magnetic field externally to heat and vulcanize, and preparing the Fe3O4 / polyurethane elastomer composite material. The preparation method for the high-performance magnetic Fe3O4 / polyurethane elastomer composite material has the advantages that: 1. Magnetic particles have good dispersity in the elastomer, and form a cross-linked structure with matrix; 2. inorganic acid is added, the viscosity of a polyurethane prepolymer system is reduced, and the high concentration adulteration of magnetic particles is guaranteed; and 4. the mechanical performance and magnetic performance of the magnetic polyurethane elastomer composite material are improved simultaneously.

The invention discloses a high-strength lead-free copper-base sliding bearing material and a preparing method thereof. FeS powder and bronze powder are mechanically alloyed through the ball milling technology, the interface bonding capability between FeS and copper is improved, FeS particles are evenly distributed in a copper base body, the defect that aggregating is likely to happen when the content of the FeS is high is overcome, the dispersion strengthening function of FeS can be brought into play, and the material mechanical performance is improved. According to the high-strength lead-free copper-base sliding bearing material and the preparing method thereof, the good solid self-lubricating capability of FeS is mainly utilized, the friction and abrasion performance of the lead-free copper-base sliding bearing material is improved, effective unification between the high strength and the good lubricating character of the copper-base sliding bearing material is achieved, and application of the lead-free copper-base bearing material under complex work conditions is widened.