7results about How to "Improve material properties" patented technology

The invention relates to a production process of a high-elasticity heat-resistant polyester yarn, which comprises the following steps: firstly, selecting high-molecular-weight polyethylene glycol terephthalate, adding 1-3% of nano filler and 5-10% of functional copolymer, and drying at 150 DEG C for 4-6 hours to improve the stability and processability of the material; secondly, melt extrusion is conducted at 280-290 DEG C, spinning is conducted through a multi-section temperature control spinning head, and the fiber cooling uniformity is effectively controlled. Then, two times of drafting and a heat setting process are adopted, the orientation degree of a molecular chain is improved in one time of drafting, and low-temperature plasma treatment is combined to optimize the surface activity and the setting effect of the fibers. In the secondary drafting, the fiber deformation is finely adjusted at low temperature, the thermal damage is reduced, the elasticity is improved, and finally, xylanase treatment and ultraviolet curing are combined, so that the softness, the skin-friendly property and the weather resistance of the fiber are remarkably improved.

The utility model discloses a continuous denitrification biofilter for deep denitrification, which comprises a filter body, two sides of the bottom of the filter body are respectively and fixedly connected with a filter material washing water inlet pipe and a water inlet pipe, a spiral device II is arranged above the filter material washing water inlet pipe and a sewage inlet pipe, and a spiral device I is arranged in the middle of the inside of the filter body. The partition wall is arranged in the tank body and close to the filter material inlet pipe, a filter material inlet pipe is arranged on one side, close to the spiral device II, of the partition wall, a water outlet pipe is arranged at the upper end of the tank wall on one side of the tank body, and the filter material is placed in the tank body. Compared with the prior art, the filter material has the advantages that the novel light filter material made of modified polystyrene is adopted, and compared with a common polystyrene filter material, the modified filter material has the advantages that the material characteristics of the filter material are improved, and the impact resistance of the filter material is improved; therefore, the filter material loss in the operation process of the filter tank is reduced.

The present invention relates to the technical field of synthetic coatings, and in particular to a fluorosilicone modified polyaspartic acid ester polyurea coating and a preparation method thereof. First, in the synthesis stage of polyaspartic acid resin, a monofunctional perfluoro macromonomer is introduced into the main chain of a polyaspartic acid ester molecule, thereby forming a comb-shaped (side chain) long-chain fluorine-containing hydrophobic group. Secondly, a monohydroxyl-terminated polydimethylsiloxane is used to modify an aliphatic isocyanate trimer, so that the curing agent component also has a comb-shaped (side chain) long-chain siloxane hydrophobic group. The fluorosilicone modified polyaspartic acid ester polyurea coating prepared by the present invention has excellent hydrophobic properties while still maintaining the excellent material properties and chemical resistance inherent in polyaspartic acid ester coatings.

This invention discloses a material structure and epitaxial method for a gallium nitride Schottky diode, comprising, in the epitaxial order: a substrate; an aluminum nitride (AlN) nucleation layer; a lower aluminum gallium nitride (AlGaN) stress modulation layer; an unintentionally doped (Uid) GaN buffer layer; and an upper AlGaN stress modulation layer; n + -Heavy GaN layer; n ++ -GaN ohmic highly doped layer; n-GaN transition layer; n ‑ -GaN lightly doped layer. Based on the metal-organic chemical vapor deposition (MOCVD) method, a stress modulation layer of AlGaN underlayer is introduced at the interface between the AlN nucleation layer and the UidGaN buffer layer to reduce thermal mismatch stress; and a stress modulation layer of AlGaN underlayer is introduced at the interface between the UidGaN buffer layer and the n + - The GaN heavily doped layer interface introduces a stress modulation layer on top of AlGaN to reduce lattice mismatch stress; in n ++ -GaN ohmic highly doped layer and n ‑ An n-GaN transition layer is introduced between the lightly doped GaN layers, and n ‑ - The GaN lightly doped layer is produced using a high-temperature, low-growth-rate process to improve n ‑ - Quality and electronic transport properties of lightly doped GaN layers. The GaN SBD epitaxial material achieved by this method has high quality, low stress, and low sheet resistance, which is beneficial to improving the performance of GaN SBD devices.

The present invention relates to the technical field of new biomass materials, and in particular to a preparation process of a novel bio-based cardanol side chain modified polyfluorene luminescent material. The process steps are as follows: 2,7-dibromofluorene and 1,3-dibromopropane are stirred and mixed at 70-80°C to generate 2,7-dibromo-9,9-bis(3-bromopropyl)-9H-fluorene (1); 2,7-dibromo-9,9-bis(3-bromopropyl)-9H-fluorene (1) and 2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolane-2-yl)-9,9-di-n-octylfluorene (2) are stirred and mixed at 95-105°C for 48h in a nitrogen environment to generate 9,9-bis(3-bromopropyl)-7,7'-dimethyl-9'9'-dioctyl-9H,9'H-2,2'-bifluorene (3); finally, 9,9-bis(3-bromopropyl)-7,7'-dimethyl-9'9'-dioctyl-9H,9'H-2,2'-bifluorene is mixed with a novel polyfluorene luminescent material additive (4) to generate a novel polyfluorene luminescent material 7,7'-dimethyl-9,9-dioctyl-9'9'-bis(cardanoloxypropyl)-9H,9'H-2,2'-bifluorene (5). The preparation process of the present invention improves the material properties of the novel fluorene derivative polymer.

The application relates to the technical field of high polymer materials, in particular to a hyaluronic acid-collagen composite gel for facial filling and a preparation method thereof, which is physically mixed from a collagen solution and a hyaluronic acid solution, wherein the volume of the hyaluronic acid solution is three times that of the collagen solution, the concentration of the hyaluronic acid solution is mixed from sodium hyaluronate and a composite buffer, the collagen solution is mixed from bovine collagen and the composite buffer, the molecular weight of the bovine collagen is 300-400 kDa, and the composite buffer contains lidocaine hydrochloride and a phosphate. The hyaluronic acid-collagen composite gel for facial filling and the preparation method thereof improve the material properties of collagen, enhance the anti-deformation ability and viscosity of the material, make the material better fit the facial profile and dynamic changes, reduce the deformation and displacement risk after injection, and help to improve the facial appearance and skin state and promote the repair and regeneration of the skin.

The utility model provides a carbon product sintering system which comprises a carbon product sintering furnace which comprises a furnace body used for containing one or more to-be-sintered green bodies, and the peripheries of the green bodies are filled with resistance materials; the one or more thermocouples are suitable for being arranged in the resistance material, and the thermocouples are suitable for feeding back temperature signals from the furnace body; the power supply is suitable for supplying power to the carbon product sintering furnace according to the electrical output parameters, so that the resistance material is heated to sinter the green body; and the power supply control equipment is suitable for receiving the temperature signal when the carbon product sintering furnace works. The carbon product sintering system can greatly improve the yield of the carbon products on the basis of reducing the cost.