60results about How to "Good film forming stability" patented technology

The present invention provides a propylene polymer composition for producing a biaxially oriented film, comprising propylene random copolymer and propylene homopolymer; wherein the propylene random copolymer is a copolymer of propylene and ethylene, optionally comprising one or more alpha-olefins of C4-C10; the propylene polymer composition has an overall isotacticity index, as determined by nuclear magnetic resonance method, of greater than or equal to 96.5%, and an ethylene content of greater than 0.3 wt %; and wherein, the melt flow rate of the propylene random copolymer is lower than that of the propylene homopolymer. The biaxially oriented polypropylene film produced by the propylene polymer composition of the present invention exhibits excellent physical properties, and has, in the absence of any stiffening agent, relatively higher modulus and stiffness. Moreover, the process for producing the biaxially oriented polypropylene film is featured with a good film-forming stability and a high film-forming stretching speed.

[Problems] To provide a stretched film of an addition polymer consisting of norbornene compounds favorable for use in manufacturing steps of electric insulating parts and optical parts that exhibits excellent film stability, does not suffer from coloration and has a low linear expansion coefficient.[Means for Solving Problems] A stretched film of an addition polymer consisting of norbornene compounds produced by stretching a film of the addition polymer consisting of norbornene compounds and having a linear expansion coefficient of at most 50 ppm / ° C. The draw ratio is preferably from 1.2 times to 10 times. The stretched film is preferably a non-crosslinked film. A method for producing the stretched film comprises stretching a film of the addition polymer consisting of norbornene compounds at least in one direction in an inert gas atmosphere within a temperature range of the glass transition temperature (Tg) thereof ±50° C., or stretching a film of the addition polymer consisting of norbornene compounds containing an organic compound having a specific boiling point at least in one direction.

The invention discloses a surface phosphorization treatment agent of a chemical pump stainless steel pump shell. The surface phosphorization treatment agent consists of solution A and solution B; the solution A is prepared by the following components: bismuth molybdate, sodium chloride, potassium carbonate, urea and water; the solution B is prepared by the following components in parts by weight: maleic anhydride, ammonium phosphate, sulfuric acid, zinc dihydrogen phosphate, acid assistant, potassium hypochlorite and water; and the acid assistant is prepared by the following components in parts by weight: alanine, glycine and citric acid. The phosphorization treatment agent is excellent in film forming stability, greatly improves the compactness and the uniformity of a phosphorization film after the phosphorization treatment, is high in adhesion of the phosphorization film, improves the corrosion resistance and the wear resistance of the chemical pump stainless steel pump shell, is high in purity of the phosphorization film, is easy to clean precipitates, shortens the time in traditional high-temperature surface phosphorization treatment, and solves the problem of easy inclusion of the precipitates in the phosphorization film in the traditional high-temperature phosphorization treatment.

The invention discloses a pyrene-based organic semiconductor laser material and its preparation method and application. The material uses pyrene as the core, diphenylamine groups as end-capping units, fluorenyl groups with different chain lengths as bridging units, and four-substitution symmetry. Pyrene is a butterfly structure of the core, and the material has a general structural formula as shown in the following formula: wherein, R is a C1-C30 linear or branched chain alkyl or alkoxy group; n is a natural number of 1-5. The material of the present invention is simple to prepare, the intermediate cost is low, the reaction process is easy to control, the product is easy to separate, the yield is high, and the purity is high; the material not only shows good thermal stability, low threshold value, and low water content in organic laser devices Oxygen sensitivity and high luminous intensity, and exhibit ultra-low turn-on voltage, excellent luminous brightness and efficiency in organic electroluminescent devices; show important application potential in organic semiconductor laser devices and organic electroluminescent devices .