37results about How to "Reduce the degree of separation" patented technology

The invention discloses a transparent polyurethane coating composite which is composed of a component A and a component B, wherein the component A is polyester polyol, and the component B is polyisocyanate. The transparent polyurethane coating composite is characterized in that polyester polyol comprises aliphatic and cycloaliphatic diacids with a carbon number of C6-C10; polyester polyol is prepared through carrying out condensation polymerization on one or more of aliphatic and cycloaliphatic dihydric alcohols with a carbon number of C2-C7 and one or more of aliphatic polyatomic alcohols with a carbon number of C2-C7, the molecular weight range of the polyester polyol is 500-5000, and the MWD (molecular weight distribution) of the polyester polyol is 1.1-2.1; the component B is polyisocyanate; and the equivalence ratio of reactive groups of polyisocyanate and polyester polyol is (1.1:1)-(2.5:1). The transparent polyurethane coating composite prepared by the method disclosed by the invention is good in impact property and weather resistance, the light transmittance is greater than or equal to 85.0%, and the impact strength is greater than or equal to 70%, and after the transparent polyurethane coating composite is subjected to QUV ultraviolet accelerated aging for a week, the appearance and light transmittance of a coating are not changed. The coating composite prepared by the method disclosed by the invention can be applied to the fields with higher requirements on the coating performance.

The invention discloses a fluorine-containing epoxy curing agent curable at room temperature and its preparation and application, belonging to the field of chemical and chemical synthesis. The preparation of the fluorine-containing epoxy curing agent includes two steps of preparing a fluorine-containing epoxy random copolymer solution and preparing a fluorine-containing epoxy curing agent. The curing agent not only contains fluorine-containing groups, but also contains amino groups that can react with epoxy groups, and can participate in the curing reaction of epoxy resins, so that the fluorine-containing groups and epoxy resins can achieve molecular recombination and reduce the risk of phase separation. To maximize the modification effect of fluorine-containing groups. After the epoxy resin is modified by using the fluorine-containing epoxy curing agent of the present invention, the surface hydrophobicity and oil repellency of the epoxy resin and the mechanical properties are both excellent.

The invention discloses a pressure-sensitive adhesive and belongs to the technical field of pressure-sensitive adhesives. A self-made adhesive is prepared from peach gum, sticky rice juice and the like, wherein humic acid is a mixture containing carboxyl and phenolic hydroxyl groups. The pressure-sensitive adhesive can provide weak acidic environment action. Active groups such as carboxyl and aldehyde groups can play a bridging action in the bonding process, so that the bonding strength is further enhanced. By taking methoxy polyethylene glycol of a single functional group as a long suspensionchain, composite filler is introduced into a polyurethane component, so that the separating degree of microphases of soft and hard sections in the polyurethane component is reduced. Coconut shells are crushed, acid-impregnated and steam-detonated to be subjected to fermentation with gelatin, casein and lactobacillus bulgaricus, so that the adhesive force and toughens of a pressure-sensitive adhesive system are improved. The invention solves the problem that a common pressure-sensitive adhesive is poor in adhesive force and toughness.

The invention belongs to the technical field of polymer materials, and specifically discloses a polyester resin with high hardness and good wear resistance for glass substrate coating and a preparation method thereof, and also discloses a coating containing the polyester resin , the polyester resin is prepared by reacting dibasic carboxylic acid with 2,4:3,5-biscamphor-D-mannitol, carbonate diol and linear organosilicon alcohol, and the poly The adhesion between ester resin and glass is greatly increased, and the 2,4:3,5-biscamphor-D-mannitol used at the same time can effectively improve the strength and hardness of the resin, making the entire polyester molecular chain elastic, greatly improving its wear resistance.

The present invention discloses an LED (Light Emitting Diode) epitaxial wafer and a preparation method therefor. The LED epitaxial wafer comprises a substrate, a low-temperature buffer GGaN layer, an undoped GaN layer, an N-type GaN layer, a multi-cycle quantum well layer, a P-type AlGaN layer and a P-type GaN layer, which are arranged sequentially from bottom to top. The multi-cycle quantum well layer comprises an InxGa1-xN layer / GaN layer from 6-14 cycles, and in any one cycle, the GaN layer is arranged on the In<x>Ga<1-x>N layer, and an InN thin layer is arranged below the In<x>Ga<1-x>N layer, and the thickness of the InN thin layer is 0.2-1nm, and x is 0.20-0.22. The InN thin layer enables In atoms to achieve a dynamic saturation balance before reaching the In<x>Ga<1-x>N layer, so that a segregation phenomenon of In in the In<x>Ga<1-x>N layer is reduced, thereby reducing a separation degree of electrons and a cavitation wave function caused by a quanta stark effect, so as to improve internal quanta efficiency of an LED.

The invention discloses a bistable wing of a water-air amphibious air vehicle, relates to an air vehicle wing and aims at solving the problem that under different pneumatic environmental conditions, single-shaped wings of an existing air vehicle often cannot improve the pneumatic performance under a whole flight envelope at low speed and high speed and cannot meet the flight demand under the low speed and high speed condition. The bistable wing comprises a wing rib and a bistable structure. A longitudinal section of the wing rib is an NACA supercritical wing section, and an elastic rod is connected between the front edge and the rear edge of the wing rib. The bistable structure comprises a quadrangular connecting rod mechanism and two pneumatic muscle drivers. One pneumatic muscle driver is installed between two opposite corners of the quadrangular connecting rod mechanism, one top point of each quadrangular connecting rod mechanism is installed on the wing rib, the other top point of each quadrangular connecting rod mechanism is installed on the elastic rod, and the two pneumatic muscle drivers are located in the same vertical plane and are perpendicularly arranged. The bistable wing is used for the water-air amphibious air vehicle.

The invention relates to the technical field of organic electroluminescent materials, in particular to a compound, a luminescent material, a device, and a display device. The compound has the structure shown below: the compound can be used as a thermally activated delayed fluorescence (TADF) material. The compound is used as a light-emitting material or a host material of a light-emitting layer of an organic electroluminescence device, and can realize higher light-emitting efficiency.

The invention discloses a flake oxide graphene GO free from a high temperature oxidation process and a preparation method thereof. The method comprises the following steps: by using natural graphite as a carbon source, and using sodium nitrate, potassium permanganate, sulfuric acid and hydrogen peroxide as oxidizing agents, an improved Hummers method is used to control the adding order and speed of the oxidizing agents, the oxidation time is modulated in mid temperature (35 DEG C), the oxidation stage is removed at a high temperature (98 DEG C and more), the effects that the oxidizing agents are sufficiently contacted with the graphite and the oxidation is sufficient are achieved so as to prepare the uniform flake GO. The GO prepared through the method disclosed by the invention is high in oxidation degree, the size and separation degree of the GO flakes are controllable, the preparation time is short, the requirement to experiment equipment is reduced, and the adaptability thereof is further improved.