7results about How to "Low transparency" patented technology

The application relates to the field of new packaging materials, and provides a composite film for fresh-keeping of green leaf vegetables and a preparation method thereof, main raw materials of the composite film including a base material, citric acid, glacial acetic acid and nicotinamide; the base material is a mixture of chitosan and polyvinyl alcohol; the preparation method is that chitosan and polyvinyl alcohol are dissolved and mixed, then a nicotinamide solution is added, stirring and ultrasonic treatment are conducted to uniformly distribute the components, and finally a flow casting process is adopted to form a film. The composite film can effectively delay oxidation and corruption of green leaf vegetables, and significantly prolong the shelf life of the green leaf vegetables. The composite film has good mechanical properties and flexibility, and is suitable for various fresh-keeping applications. The preparation process is simple, easy for large-scale production, the material is environment-friendly and biodegradable, and the composite film has a wide application prospect.

The utility model discloses a belong to partition structure technical field, concretely is a kind of single-layer heat insulation fireproof glass partition structure, including installation frame and spray component, the installation frame is provided with bearing groove, the bearing groove bottom is equipped with liquid collecting groove, the liquid collecting groove both sides are equipped with drain port, the bearing groove top is equipped with spray pipe hole and spray component, the spray component includes miniature water pump, the water inlet end of miniature water pump is connected with water tank by inlet tube, the lateral wall of water tank is connected with water suction pipe, the other end of water suction pipe is connected with drain port, the water outlet end of miniature water pump is connected with outlet tube, the outlet tube is connected with spray pipe, and the spray pipe is installed with shower nozzle, water in water tank can be pumped out by spray component, and water is evenly sprayed on fireproof glass by outlet tube, spray pipe and shower nozzle.In fire, spray can cool fireproof glass, prevent high-temperature damage, and reduce its transparency to enhance partition effect.

The invention belongs to the technical field of packaging materials, and particularly relates to an ultrathin high-speed packaging biaxially oriented polypropylene film and a preparation method thereof. The polypropylene film comprises an extrusion layer I, an extrusion layer II, a core layer, an extrusion layer III and an extrusion layer IV which are sequentially connected from outside to inside. The sealing temperature of the polypropylene film is lower than 90 DEG C, and the sealing requirement of a high-speed packaging machine can be met; the bending modulus of the film exceeds 1800 Mpa, and the high-speed film feeding requirement of a packaging machine is met; meanwhile, the advantages of low friction, high transparency, low shrinkage and the like are realized.

The present application relates to a kind of biaxial stretching flow polypropylene composite film and its preparation method, belong to packaging material technical field;The present application is prepared with homopolymerization polypropylene, copolymerization polypropylene, slip agent, nucleating agent, antioxidant, modified nanosilica as raw material a kind of biaxial stretching flow polypropylene composite film of high transparency and with good antistatic property and ultraviolet resistance performance, which can be used in food packaging field, the present application is modified to nanosilica, ultraviolet absorber is grafted on the surface of nanosilica, not only solve the problem of nanosilica easy to agglomerate, also solve the problem of ultraviolet absorber easy to migrate, by quaternary ammonium salt structure conjugation, ultraviolet absorber has better ultraviolet absorption performance and antistatic property.

The invention provides ternary copolymerized polyimide, a polyimide film and a preparation method and application thereof, the ternary copolymerized polyimide is prepared from the following monomer raw materials through polymerization and imidization reaction: diamine monomer: 9, 9-bis (4-aminophenyl) fluorene; the dianhydride monomer comprises hexafluorodianhydride and 9, 9-bis (3, 4-dicarboxyphenyl) fluorene dianhydride; wherein the total molar weight ratio of the diamine monomer to the dianhydride monomer is 1: 1; in the dianhydride monomer, the molar ratio of the 6FDA to the BPAF is (0.8-1.2): 1. According to the present invention, the traditional thought that the transparency is improved by introducing the fluorenyl monomer at the low content is abandoned, and the high-proportion rigid double fluorenyl structure (BAFL and BPAF) and the flexible fluorine-containing structure (6FDA) are innovatively adopted to perform the ternary polymerization at the specific ratio so as to produce the significant synergistic effect; the obtained polyimide film has high heat resistance (Tg is greater than or equal to 420 DEG C), low thermal expansion coefficient (CTE is less than or equal to 20 ppm / K), low dielectric constant (Dk is less than or equal to 3.5 under 10 GHz) and high transparency (light transmittance at 450 nm is greater than or equal to 85%), and is especially suitable for high-performance flexible display substrates.

This invention discloses a KASP molecular marker primer set for improving the quality of semi-glutinous rice and its application, belonging to the field of bio-breeding technology. The development method of the KASP molecular marker primer set for improving the quality of semi-glutinous rice disclosed in this invention is as follows: target gene sequencing is performed on donor and recurrent parents; the BEIIb, SSIV-1, SSI, SSIIa, and PUL gene sequences are compared between the donor and recipient parents to screen for SNP mutation sites for KASP molecular marker development; the primer set for KASP molecular markers is synthesized; KASP molecular marker detection is performed on the segregating population; and finally, six new rice lines are obtained. Compared with the recurrent parents, the appearance quality of the rice in the five lines showed significantly reduced chalkiness rate, chalkiness degree, and transparency, and significantly increased amylose content. Compared with the donor parents, the gel consistency increased, the gelatinization temperature decreased, and the protein content remained unchanged.

The invention discloses a phenoxy triazine sulfonate flame retardant as well as a preparation method and application thereof, relates to the field of sulfonate flame retardants, and aims to solve the problems that an existing sulfonate flame retardant is relatively high in water solubility, short in timeliness and easy to separate out. The preparation method of the phenoxy triazine sulfonate flame retardant comprises the following steps: 1, mixing cyanuric chloride and a solvent, and stirring until cyanuric chloride and the solvent are dissolved; 2, dissolving a bisphenol organic matter and an acid-binding agent in water, and dropwise adding to obtain an intermediate 1; 3, dissolving p-hydroxybenzene sulfonate and an acid-binding agent in water, dropwise adding to obtain an intermediate 2 when the dropwise adding amount reaches half, continuously dropwise adding, heating, and carrying out reflux reaction; and 4, stopping heating, cooling, carrying out suction filtration, washing and drying to obtain the phenoxy triazine sulfonate flame retardant. The flame retardant provided by the invention has water insolubility, has better compatibility with PC, has less influence on transparency and haze, and is not easy to separate out in a PC matrix. The flame retardant is used for flame retardance of bisphenol A polycarbonate.