5results about How to "The preparation process is highly controllable" patented technology

The invention discloses an oil-resistant cold-resistant flame-retardant polyvinyl chloride material and a preparation method thereof. The polyvinyl chloride material is prepared from the following raw materials in parts by weight: 100 parts of PVC resin, 40-60 parts of a plasticizer, 30-50 parts of a flame retardant, 15-25 parts of a cold-resistant agent, 10-20 parts of an oil-resistant agent, 5-10 parts of a heat stabilizer and 2-5 parts of a lubricant. Wherein the flame retardant is a composite flame retardant composed of aluminum hydroxide, magnesium hydroxide and antimony trioxide, the cold-resistant agent is an ethylene terpolymer, and the oil-resistant agent is a polar copolymer of acrylonitrile and butadiene. The material is excellent in comprehensive performance, the low-temperature impact performance can pass minus 40 DEG C, after an oil resistance test, the mechanical property loss is extremely small, the oxygen index is maintained to be about 30%, the stable mechanical property and thermal stability are achieved, collaborative optimization of oil resistance, cold resistance and flame retardance is achieved, and the service life of the material is prolonged. The cable is suitable for cable preparation under complex working conditions such as automobile engine cabins, industrial equipment in extremely cold areas and petrochemical engineering, the preparation process is high in controllability, and industrial production is easy.

The invention discloses a high-temperature-resistant honeycomb composite protection plate for an armored car shell and a preparation method of the high-temperature-resistant honeycomb composite protection plate, relates to the technical field of armor protection, and solves the technical problems that the bulletproof performance and the metal jet flow prevention performance of an existing armor plate are difficult to consider, the high-temperature-resistant stability is insufficient, and the adaptability of a preparation process is poor. The protection plate is composed of a surface layer (1) made of a high-strength alloy steel plate, an inner layer (2), an antinode rib plate array (3) and a high-temperature-resistant functional mortar filling layer (4), a honeycomb supporting structure is formed through array type welding, and customized high-temperature-resistant functional mortar is filled in a cavity; the preparation method comprises the steps of pretreatment, honeycomb skeleton forming, mortar customization preparation, pouring filling, curing, accurate performance detection and the like. Through collaborative innovation of structure-material-process, comprehensive optimization of bulletproof, metal jet prevention, high temperature resistance and light weight is realized. The device is suitable for protecting shells of armored cars and amphibious armored cars, and the safety survivability of equipment is remarkably improved.

The present invention belongs to the field of preparation of plasmon nanomaterials, and discloses a Ag‑Au cascade nanoarray SERS substrate, preparation method and application. Specifically, porous anodized aluminum is used as a template to obtain a polycarbonate polymer nanocolumn array by nanoimprinting; nano-Ag film and thick Cu film are deposited on the top of the nanocolumns in sequence by grazing angle coating, and then the Ag / Cu film is removed to obtain a hollow Ag nanoarray; electrochemically deposit modified gold nanoparticles on the surface of the hollow Ag nanoarray to obtain an Ag‑Au cascade nanoarray SERS substrate. This method can efficiently construct a large-area uniform cascade nanoarray structure SERS substrate, and the preparation process is simple and controllable, with good repeatability and detection uniformity. The relative standard deviation value of the SERS signal for crystal violet (CV) can be as low as 6.65%; the obtained SERS substrate has cascade scale characteristics, high sensitivity, and can provide more abundant molecular adsorption sites, and the detection concentration of CV is as low as 10 ‑9 M.

The invention relates to a preparation method of a wear-resistant boron nitride reinforced copper-based composite material with high electric conductivity and heat conductivity, and belongs to the technical field of composite material preparation. According to the method, high-purity cathode copper serves as a raw material, and the copper foil with the specific thickness is prepared through the pretreatment processes of smelting, rolling, annealing and the like. And then respectively carrying out surface pretreatment on the two-dimensional boron nitride nanosheet (BNNS) and the copper foil, and further uniformly depositing a BNNS enhancement layer on the surface of the copper foil by adopting a cold spraying technology. And finally, after the copper foil deposited with the BNNS reinforcing layer is subjected to multi-layer stacking and block addition, densification and interface strengthening of the composite material are achieved through a hot isostatic pressing technology, and the BNNS / Cu composite material which is uniform and compact in structure, good in BNNS dispersion and excellent in interface bonding is finally obtained. The preparation method is controllable in process and high in practicability, the prepared copper-based composite material has outstanding heat conduction and wear resistance on the basis that the excellent electrical conductivity of a copper matrix is kept, and technical guidance is provided for research in the fields of pantograph slide plate material preparation and the like.

The invention discloses a preparation method of adhesive recombinant collagen chitosan composite microspheres capable of efficiently stopping bleeding. The preparation method comprises the following steps: 1, preparing chitosan grafted with gallic acid; 2, dispersing the recombinant collagen and the chitosan grafted with gallic acid into deionized water to obtain a water phase; 3, adding a surfactant into petroleum ether to obtain an oil phase; 4, injecting the oil phase into the water phase, emulsifying, and cooling to obtain an emulsion; 5, blending a cross-linking agent, water and absolute ethyl alcohol, and pre-cooling to obtain a stationary liquid; and 6, adding the stationary liquid into the emulsified liquid for curing, washing and freeze-drying to obtain the recombinant collagen chitosan composite microspheres. The prepared composite microspheres are excellent in performance and can be widely applied to the medical instrument industry as styptic powder, and an efficient, safe and reliable styptic material is provided for the medical field.