89results about How to "Low oxygen transmission rate" patented technology

The invention discloses a high-barrier biodegradable free-standing bag and a preparation method thereof. The free-standing bag is composed of two parts of a high-barrier biodegradable self-sealing strip and a five-layer composite high-barrier biodegradable bag body, the main substrate of the high-barrier biodegradable self-sealing strip is PLGA and PPC with excellent barrier property, the five-layer composite high-barrier biodegradable bag body is composed of single-light white kraft paper, a bonding layer, a first barrier layer, a second barrier layer and a heat seal layer, and is integrallyformed by adopting the four-layer co-extrusion and film-coating combined process. Compared with a traditional non-degradable free-standing bag, the prepared high-barrier biodegradable free-standing bag has the advantages that the physical mechanical property and the heat sealing performance are substantially equivalent, the barrier property is more excellent, biodegradation can be achieved, the problem of "white pollution" caused by waste of traditional free-standing bags is solved, and the application of the biodegradable plastic in the field of high-barrier food packaging is expanded, so that the high-barrier biodegradable free-standing bag has very important significance.

A flexible colorless and transparent polyimide film and a preparation method thereof belong to the field of polyimide films, and solve the problems of low oxygen and water vapor permeability and high thermal expansion coefficient of the existing polyimide film. The invention includes: dissolving diamine and dianhydride in an organic solvent to generate polyamic acid glue, adding dehydrating agent and catalyst to complete chemical imidization reaction to generate polyimide glue, and precipitating and drying it in a solvent to obtain Polyimide resin, dissolve it in an organic solvent to obtain a polyimide resin glue, vacuum degassing it, coat it on a glass plate, heat it up and then cool it down to obtain a flexible, colorless and transparent polyimide The surface of the buffer layer is treated to form a layer of buffer layer; a layer of polyimide resin glue is coated on the surface of the buffer layer, and the temperature is increased after heating to obtain a flexible colorless transparent polyimide film with a composite structure. The present invention has low oxygen transmission rate, low water vapor transmission rate, low thermal expansion coefficient and high visible light transmission rate.

The invention discloses a tantalum alloy surface modified composite Hf-Ta coating layer. The tantalum alloy surface modified composite Hf-Ta coating layer consists of the following components in percentage by mass: 19.5-24.5% of Ta, 0.5-2.5% of Si, 0.5-1.2% of B, 0.5-2.5% of Al, 0.5-2.0% of Cr, and the balance being Hf. In addition, the invention further discloses a method for preparing the modified composite Hf-Ta coating layer; and the method comprises the following steps: (1) a tantalum alloy is washed by acid after being polished, and then is subjected to the sand blasting treatment and the degreasing treatment; (2) modified composite Hf-Ta slurry is prepared; and (3) the slurry is pre-positioned on the surface of the tantalum alloy to obtain a pre-positioned layer; and then, the high-temperature fusion sinteringis performed to prepare the modified composite Hf-Ta coating layer. The modified composite Hf-Ta coating layer can prominently improve the oxidation resistance of the tantalum alloy in environments of ultrahigh temperature and low oxygen pressure, and can provide short-time protection for the tantalum alloy in an ultrahigh-temperature oxidation environment and an ablation environment.

The invention discloses a preparation method for a flexible organic light emitting diode (OLED), comprising the following steps: (1) a polyethylene terephthalate (PET) sheet is fixed at a support plate by binder as a base plate; the surface of the base plate is cleaned and dried; a barrier layer which is formed by successive alternating deposit of thin polymer films and thin inorganic material films with high transmittance is prepared on the base plate; the refractive index of the thin polymer films and the thin inorganic material films matches with the refractive index of the base plate; (2) an indium tin oxide (ITO) film and a metal layer are prepared at the base plate equipped with the barrier layer and etching of a metal line and an ITO line and making of polyimide (PI) patterns and RIB patterns are completed; during etching of the metal line and the ITO line, mechanical stirring or ultrasonic stirring are performed on the etching liquid; (3) then the base plate is put in an evaporation chamber for evaporation of an organic function layer and a negative electrode; (4) a thin film packaging layer is prepared on the surface of the negative electrode by vacuum evaporation and the packaging layer is formed by alternating deposit of at least one layer of organic material and at least one layer of inorganic material; and (5) the base plate is stripped off the support plate.