45results about How to "Promote orderly arrangement" patented technology

The invention belongs to the field of high polymer materials and particularly relates to a polyimide film with a low thermal expansion coefficient and a preparation method of the polyimide film. The polyimide film has the following structural formula shown in the specification, wherein R1 and R3 are residues of two different tetracarboxylic acid dianhydride monomers, and R2 and R4 are residues of two different di-primary amine monomers. The preparation method is a multi-step polymerization method, firstly, two polyimide acid solutions with different structure units are obtained through polymerization respectively, then the solutions are mixed and then polymerized, finally, heating drying is carried out, and the polyimide film with the low thermal expansion coefficient is obtained. Compared with the prior art, the polyimide film with the low thermal expansion coefficient introduces ester bonds/amide, imidazole/oxazole and other structure units into molecular structure design at the same time, the interaction force among molecules is improved, the thermal expansion coefficient of the polyimide film is effectively reduced, meanwhile, the thermal expansion coefficient of the polyimide film can be adjusted and controlled by adopting different formulas, and the matching problem among different substrate materials is solved.

The invention provides a method for preparing a petroleum-based mesophase pitch with high anisotropic structure content and low softening point. The method comprises the following steps: conducting reduced pressure distillation on an FCC (Fluid Catalytic Cracking) decant oil of a naphthenic crude, taking a cut fraction with the boiling point of 400-540 DEG C as a raw material, and reacting for 1-8 hours at the temperature of 400-460 DEG C and under the pressure of 4 MPa to obtain a petroleum pitch; then adding a hydrogen donor, reacting under condition of the self-generated pressure at the temperature of 380-450 DEG C at the initial nitrogen pressure of 5 MPa, then reducing the pressure to the normal pressure, cooling to 340 DEG C, and blowing with high-purity nitrogen for 0.5 hour to obtain a hydrogenated pitch; finally adding a co-carbonization additive, and reacting for 2-16 hours at the temperature of 400-480 DEG C at the pressure of 4MPa to obtain the high-quality mesophase pitch. The preparation process is simple, the production cost is low, the anisotropic structure content (more than 98%) of the prepared mesophase pitch is high, the softening point (230-270 DEG C) is low, the spinning property is good, and the mesophase pitch is an excellent precursor for preparing a high-modulus carbon fiber.

The invention relates to the technical field of functional film materials, and in particular relates to a graphitized film and a preparation method and application thereof. The preparation method of the graphitized film comprises: (1) low temperature in-situ polymerization of a diamine monomer and a dianhydride monomer; (2) film casting of an obtained mixed solution; (3) in-sequence drawing treatment and heating imidization of an obtained graphene/polyamic acid composite film; (4) and in-sequence heating carbonization and heating graphitization of an obtained graphene/polyimide composite film.Edge-functionalized graphene is used as a filler, and the graphene/polyamic acid composite film is appropriately drawn to improve the orientation and regularity of the composite film, and so that theobtained graphitized film has high directivity, high conductivity and high thermal conductivity, and is expected to be better applied in microelectronic packaging, electromagnetic shielding, heat dissipating materials, electrode materials and other aspects.

The invention provides a porous reducing state titanium dioxide crystal material and a preparation method thereof. The porous reducing state titanium dioxide crystal material has the anatase crystal phase; the specific surface area is 463 to 736 m<2>/g; the pore diameter is 1 to 4nm; the doping quantity of the surface Ti<3+> irons is 5.1 percent to 9.4 percent; the light absorption interval covers ultraviolet light and visible light intervals. Through an optoelectronic storage technology under the room temperature condition, the porous reducing state titanium dioxide crystal material with the large specific surface area is synthesized for the first time. The preparation method is different from a conventional synthesis method; a mild room temperature processing process is used for replacing a conventional high-energy processing process to realize the material crystallization and to overcome building defects. The porous reducing state titanium dioxide crystal material and the preparation method have the advantages that the synthesis technology is simple and green, and is suitable for large-scale production.

The invention discloses an application of a compound Szeto-Schiller-31 (SS-31) to prepare a medicine for treating Friedreich's ataxia (FRDA) and related diseases. The invention belongs to the field of a medicine, and specifically relates to an application of SS-31 to treat FRDA diseases. It is found from experiments that SS-31 can up-regulate expression of frataxin (FXN) in FRDA patient's cells in a translational level, adjust iron metabolism in FRDA patient's cells, promote synthesis of iron-sulfur clusters in mitochondria, improve the function of mitochondria, reduce generation of ROS in patient's cells, and improve anti-oxidative stress performance of cells. The result shows that SS-31 has the potential value of treating FRDA.

The invention discloses a method for preparing resistant starch RS3 from high-amylose corn starch. The method comprises the following steps: slurrying the high-amylose corn starch, then, adding an antioxidant, high-melting-point grease and a debranching enzyme, carrying out uniform mixing, then, carrying out refrigerating treatment at high temperature and high pressure and low temperature, and carrying out crushing and sieving, thereby obtaining the resistant starch RS3. According to the resistant starch RS3 produced by the method, the defect of 'sand grain feeling' of the existing products is overcome, and the product has the advantages of smooth taste, high resistant starch content, good heat resistance and high enzymolysis resistance.

The invention discloses a merging core for extrusion moulding machine, characterized in that the merging core is provided with a guide pore, the cavity of which is provided with a guide device which can either be straight grid tray or broken line gird plate, and which can also be vertical tooth-staggered grid tray; the guide pore can also be conic, and the width of inlet ends of grid pores between the straight grid trays is larger than the width of outlet ends. As a component for wood-plastic composite extrusion moulding equipment, the merging core can enhance the quality of articles and is suitable for the extrusion moulding of wood-plastic composite extrusion moulding machine.

The invention discloses a lovastatin purification method combining auxiliary magnetic crystallization, which comprises the following steps: dissolving a lovastatin crude product in organic solvent, and then gradually cooling the lovastatin solution; and applying a magnetic field to the solution until crystals are precipitated, and separating and drying the crystals to obtain a lovastatin product. In the crystallization process, the ordered arrangement of lovastatin molecules is increased through auxiliary magnetic treatment, thereby increasing the quality and quantity of high-purity crystal nuclei, improving the crystallization conditions, obtaining the crystals which are high in purity and easy to separate and enhancing the product quality.

The invention discloses a low thermal expansion coefficient SiO2/polyimide composite film and preparation method thereof. The composite film is prepared from a basis material of rigidity polyimide andSiO2 through in-situ composite, and the basis polyimide is prepared from 1,2,4,5-Bbenzenetetracarboxylic anhydride (PMDA) and 2-(4-aminophenyl)-5-amidogen-benzoxazole (BOA) through polycondensation.According to the low thermal expansion coefficient SiO2/polyimide composite film and the preparation method thereof, the preparation technology is simple, and SiO2 is well dispersed in the basis material. Compared with the prior art, according to the SiO2/polyimide composite film, the rigidity PMDA and the BOA structural units are introduced in the molecular structure of the basis material, and meanwhile the high thermostability and the low thermal expansion coefficient of the prepared SiO2/polyimide composite film are presented through the high heat resistance of the BOA. The requirements ofheating matching of silicon-based materials in the aspect of integrated circuit and chip package technology can be well met, the low thermal expansion coefficient SiO2/polyimide composite film can beused in the microelectronics industry, for example, insulating layers in multilevel-multilayer metallization of the electronic packaging field; and the low thermal expansion coefficient SiO2/polyimidecomposite film can also be used for insulating layers in solar cells. Thus, the low thermal expansion coefficient SiO2/polyimide composite film has wide application prospects.

The invention discloses a plant extract-containing composition for regulating scalp grease secretion and brightening and smoothening hair. The plant extract-containing composition is prepared from hydrolyzed keratin, camellia oleifera seeds, cacumen biotae, semen cassiae, porous starch and nano antibacterial particles. The plant extract-containing composition for regulating scalp grease secretion, brightening and smoothening hair contains various plant extracts, and can improve the ordered arrangement of hair scales, inhibit the breeding of bacteria and fungi, regulate the water-oil balance of head skin, clean and remove dandruff by utilizing the effects of camellia oleosa seed oil, other plant extracts and hydrolyzed keratin; the shampoo can supplement nutrition and moisture required by hair and scalp, reduce scalp itching, prevent hair loss and furcation, improve scalp blood circulation, promote metabolism, make hair roots strong, make hair dense and soft, and make hair healthy. The composition and a silicone-oil-free shampoo matrix can effectively avoid scalp problems caused by accumulation of silicone oil, so that washed hair is fluffy and natural, and is really bright, smooth, soft and glossy.

The invention discloses a rapid and automatic mica plate splitting and feeding jig. The jig comprises a board body jig, a groove formed in the board body jig and multiple blanking holes formed in thegroove; the groove comprises multiple first acute angle grooves which are formed in one side of the board body jig and protrude toward the outer side and multiple second acute angle grooves which areformed in the other side of the board body jig and protrude towards the outer side, a connecting part parallel to the side of the board body jig is arranged between the first acute angle grooves, an acute angle part which is in opposite reverse extension connection with the second acute angle grooves is formed between the second acute angle grooves, the blanking holes are formed in the top cornerpositions of the first acute angle grooves and the second acute angle grooves, and vertically penetrate the board body jig, and the blanking holes comprise inverted-conical first hole positions, and columnar second hole positions arranged on the bottoms of the first hole positions. Stable and continuous automatic feeding of mica plates is achieved.