950results about How to "Improve heat resistance" patented technology

Polyimide film and preparation method thereof

ActiveCN105461923AExcellent colorless transparencyImprove heat resistanceDiamineSolvent
The invention discloses a polyimide film. The polyimide film is prepared by the steps of copolymerizing fluorine-containing dianhydride, fluorine-containing diamine and silicon-containing diamine in the presence of an aprotic solvent to generate polyamide acid, and carrying out thermal imidization to obtain the polyimide film. The prepared polyimide film has excellent colourless transparency and high adhesion to various materials. The ultraviolet light cutoff wavelength of the polyimide film is 330nm-345nm, and the maximal transmittance of the polyimide film at 400nm reaches up to 96%; the adhesive force levels of the polyimide film with the surfaces of substrates including aluminum plates, copper foil, glass, ceramic and the like can all reach level 1 or above, the polyimide film does not fall at all after being boiled in water of 80 DEG C for 500 hours, and the lap shear strength exceeds 1.5MPa; meanwhile, the polyimide film preserves high heat resistance and mechanical strength, the tensile strength is 45MPa-83MPa, and the initial decomposition temperature is 483-532 DEG C; furthermore, the polyimide film can be dissolved in partial organic solvents, is good in machinability and has good application prospects in the photoelectric fields of flexible solar cell substrates, liquid crystal display oriented films, communication-linked optical waveguide materials, and the like.

High-strength alloyed aluminum-system plated steel sheet and high-strength automotive part excellent in heat resistance and after-painting corrosion resistance

The present invention provides a hot press method used for producing a high-strength member for an automobile and, in particular, a part which requires high-strength, such as an undercarriage component of an automobile. More specifically, the present invention provides an aluminum plated steel sheet or an aluminum-zinc plated steel sheet suitable for high temperature forming (hot forming) wherein high strength is obtained after high temperature forming, and a method of producing the same. Also, the present invention provides a hot dip aluminum plated steel sheet which suppresses the alloying reaction of a plated layer during press forming and has beautiful appearance, and an aluminum-system plated steel sheet for hot press having excellent after-painting corrosion resistance. Concretely, the present invention is a high-strength aluminum-system plated steel sheet excellent in heat resistance and after-painting corrosion resistance, characterized by having an Fe-Al-system coating containing, in mass, Mn and Cr of more than 0.1% in total on the surface of the steel containing, in mass, C: 0.05 to 0.7%, Si: 0.05 to 1%, Mn: 0.5 to 3%, P: not more than 0.1%, S: not more than 0.1% and Al: not more than 0.2%, and, in addition, one or more element(s) selected from among Ti: 0.01 to 0.8%, Cr: not more than 3% and Mo: not more than 1%, so as to satisfy the following expression (1): Ti + 0.5xMn + Cr + 0.5xMo > 0.4 ... 1

Water-based release agent for aluminum alloy die casting and preparation method thereof

The invention discloses a water-based release agent for aluminum alloy die casting and a preparation method thereof. The release agent comprises, by mass, 10 to 30% of dimethicone, 5 to 15% of modified silicone oil, 5 to 20% of a wax composition, 4 to 15% of a surfactant, 1 to 3% of an anti-rust corrosion inhibitor and 0.1 to 1% of a bactericide, with the balance being deionized water. The preparation method comprises the following steps: heating dimethicone, modified silicone oil, the wax composition and the surfactant to a temperature of 70 to 80 DEG C and carrying out uniform mixing with stirring; slowly adding deionized water accounting for 30 to 40% of the total weight of the release agent with stirring in batches so as to prepare an oil-in-water O/W pre-emulsion; and carrying out grinding by using a colloid mill and adding the anti-rust corrosion inhibitor, the bactericide and residual deionized water so as to obtain the water-based release agent with an emulsion particle size of 0.1 to 0.4 mu m. According to the invention, modified silicone oil is used as main base oil, so emulsification difficulty is lowered down, heat resistance is improved, and good high temperature stability is obtained; the wax composition has excellent lubrication capability and a good film forming effect. The release agent has excellent heat resistance, excellent lubricity and a good film forming effect.

Lost foam casting-penetrating method for improving heat resistance of gray cast-iron based casting surface

InactiveCN101444839AImprove heat resistanceImproved heat and oxidation resistanceFoundry mouldsFoundry coresCast ironSpray method
The invention discloses a lost foam casting-penetrating method for improving heat resistance of gray cast-iron based casting surface, aiming at forming a heat-resistant alloy layer on the casting surface. The steps of the method comprises: 1) the preparation of a lost foam model, and the design and mixture of all composites of casting-penetrating coating layer are carried out; that is, polystyrene foam plastics are used for processing the lost foam model which has the same shape with the casting needed; the composites and content of the casting coating layer are designed, weighted and evenly mixed. 2) the casting coating-penetrating layer and a coating layer are coated; that is, caking agents are added in the composites of the mixed casting-penetrating coating layer, then is mixed to be pasty; the pasty matter is uniformly coated on the corresponding surface of the lost foam model, the surface is leveled by brushing absolute ethyl alcohol and is baked in an electric stove. The surface of the casting-penetrating coating layer is coated into the coating layer after the coating is dried on the lost foam model by adopting a brushing, soaking, dripping or spraying method, and then is baked in the electric stove. 3) molding is carried out. 4) casting is carried out; that is, the casting temperature of molten iron of the gray casting iron is 1400-1450 DEG. C, after being casted for four hours, box-opening, cooling, sand shaking-out and cleaning are carried out.

Modified phenolic resin adhesive for friction material and preparation method for modified phenolic resin adhesive

The invention discloses a modified phenolic resin adhesive for a friction material and a preparation method for the modified phenolic resin adhesive. The method comprises the following steps of: mixing 100 mass parts of phenol, 60 to 120 mass parts of 37 mass percent formaldehyde solution, 2 to 20 mass parts of amine substance and 8 to 40 mass parts of cardanol uniformly, dripping 1 to 20 parts of composite catalyst, heating to the temperature of between 80 and 105 DEG C, and performing constant-temperature reaction for 0.5 to 2 hours; and adding 0 to 10 parts of acid catalyst, continuously performing constant-temperature reaction for 1 to 2 hours to obtain orange milky dope, washing the orange milky dope for 2 to 5 times in water of 60 to 70 DEG C, drying, dehydrating, and thus obtaining the cardanol and amine substance modified phenolic resin adhesive. The amine substance can be well dissolved, so that the reaction rate is quickened; the toughness of the modified phenolic resin adhesive is further enhanced by adding powdery nitrile rubber; and the friction material prepared by using the modified phenolic resin adhesive has the advantages of low abrasion rate, long service life, high toughness, high-temperature resistance, high-strength impact resistance and low noise.
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