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560results about How to "Good heat resistance" patented technology

Metal and plastic composite self-lubricating material and preparation method thereof

The invention discloses a metal and plastic composite self-lubricating material and a preparation method thereof. The metal and plastic composite self-lubricating material comprises a metal layer, a plastic binding layer and a plastic working layer, wherein the plastic binding layer binds the metal layer and the plastic working layer together through a chemical bond of a molecule; one part of theplastic working layer is embedded in a drop pit of the metal layer; the plastic working layer includes the material components according to the mass percent as follows: 60-90 of polyether-ether-ketone, 5-20 of polyfluortetraethylene, 7 of graphite, 1 of MoS2 and 5-10 of aluminium oxide; and the plastic binding layer includes the material components according to the mass percent as follows: 70-90 of polyether-ether-ketone, 5-20 of polyphenyl thioether and 5-10 of aluminium oxide. By adding the plastic binding layer between the metal layer and the plastic working layer, the invention further improves the binding strength of metal and plastic, has favorable heat resistance and resistance to chemical corrosion, no environment pollution, low noise and energy saving; in addition, the usage temperature is -60 DEG C to 250 DEG C, the friction coefficient is 0.08-0.32 and the wear rate is 0.8-3.5*10<-6>mm<3>/N. m.
Owner:JIANGSU UNIV

High-wearability insulating cable material and preparation method thereof

The invention discloses a high-wearability insulating cable material and a preparation method thereof. The high-wearability insulating cable material is prepared from the following raw materials in parts by weight: 70 to 90 parts of polyurethane rubber, 15 to 20 parts of polytetrafluoroethylene, 10 to 15 parts of nylon 6, 10 to 15 parts of polypropylene glycol adipate, 5 to 10 parts of dipropylene glycol dibenzoate, 5 to 10 parts of trel-butylphenyl diphenyl phosphate, 7 to 13 parts of antimonous oxide, 5 to 10 parts of decabromodiphenylethane, 4 to 8 parts of zinc borate, 2 to 3 parts of tert-butyl peroxybenzoate, 1.5 to 2 parts of zinc oxide, 2 to 3 parts of stearic acid, 3 to 6 parts of chlorcosane, 1 to 2 parts of accelerant ZDMC (Zinc Dimethyldithiocarbamate), 1 to 2 parts of accelerant CZ (N-cyclohexylbenzothiazole-2-sulphenamide), 15 to 20 parts of fumed silica, 10 to 15 parts of attapulgite nanoocomposites, 5 to 10 parts of nano zeolite, 10 to 15 parts of precipitated barium sulphate, 1.5 to 2.5 parts of antioxidant 1010, 2 to 3 parts of anti-aging agent TPPD (N-(p-toluene-sulphonylamido-N'-phenylene diamine)), and 3 to 6 parts of composite filler. The cable material is outstanding in wearability, particularly, the wearability is always several times and even dozen times that of the common electrical material under a terrible working condition in the presence of water, oil and other wetting medias; the cable material is also remarkable in heat resistance, flame resistance, ageing resistance, oil resistance, warping strength, impact resistance and tear resistance.
Owner:ANHUI WANGDA COPPER DEV

Method for preparing high solid content aqueous polyurethane emulsion by continuous process

InactiveCN101328253AImprove initial bond strengthGood heat resistancePrepolymerSolvent
The invention provides a method for preparing water-borne polyurethane emulsion with high solid content by the continuous method. The method comprises the following steps that: oligomer polylol after vacuum dehydration, isocyanate, a chain extender, a solvent and a catalyst are added into a reactor at a time under the protection of dry nitrogen; the mixture is mechanically stirred and simultaneously controlled at a certain temperature for reaction to a certain degree; the system temperature is reduced to between 20 and 50 DEG C; the hydrophilic chain extender is slowly dripped into a prepolymer which is then added with the solvent so as to prevent gel coagulation caused by overlarge viscosity; the isocyanate-based NCO content in the prepolymer which is generated through reaction is not changed again; and the prepolymer is added with water again to perform emulsion dispersion and undergoes vacuum distillation to remove the solvent, and then the water-borne polyurethane solution is prepared. The water-borne polyurethane solution prepared by the method has high solid content, low viscosity, large initial bonding strength, and good heat resistance, can be used as textile fabric coating agent, shoe coating agent, leather finishing agent, and adhesives used in the fields of wood, architecture, automobile, paper-making, electronics and so on.
Owner:ANHUI UNIVERSITY +1

High temperature resistance precoated sand

The invention discloses high temperature resistance precoated sand, which comprises base sand, a binder, hexamethylenetetramine, a phenol formaldehyde resin, a silane coupling agent and an additive A, wherein the base sand comprises, by weight, 55-60 parts of iron ore sand, 60-70 parts of forsterite sand, and 7-10 parts of diatomite, a particle size of the base sand is 100-150 mesh, 3-5 parts by weight of boric acid, 1-2 parts by weight of water-soluble polymer glue powder, 3-5 parts by weight of starch, 0.5-0.8 part by weight of rosin, 4-5 parts by weight of dextrin and 4-6 parts by weight of water are subjected to a reaction and drying to obtain the binder, 4-6 parts by weight of a straw powder material, 2-4 parts by weight of sepiolite and 5-8 parts by weight of water are subjected to a mixing calcination treatment to obtain the additive A, a particle size of the straw powder material is 0.5-0.8 mm, and the obtained calcined product, 2-4 parts by weight of montmorillonite powder and 3-4 parts by weight of water glass are subjected to mixing granulation. The high temperature resistance precoated sand has the following characteristics that: moisture absorption resistance is good, roughness is low, high temperature resistance is provided, and sand sticking on a cast is not easily generated.
Owner:FANCHANG COUNTY HENGXIN AUTO PARTS

Transformation of acidic beta-mannase gene and construction of engineering bacteria of acidic beta-mannase gene

The invention discloses transformation, synthesis and splicing of acidic heat-resistant beta-mannase gene and construction of engineering bacteria containing the acidic heat-resistant beta-mannase gene. An encoding gene has a nucleotide sequence shown as SEQIDNO.3 or SEQIDNO.4; and the acidic beta-mannase obtained by encoding has an amino acid sequence shown as SEQIDNO.1 or SEQIDNO.2. According to the construction of the engineering bacteria, the engineering bacteria are obtained by introducing Pichia pastoris constitutive expression vector (pGAPZalpha-man) into Pichia pastoris. The acidic heat-resistant beta-mannase gene disclosed by the invention has the following properties that the optimum action pH is 5.0, the optimum action temperature is 40DEG C, the structure is favorable and the properties are stable when the pH value is in a range of 3.0 to 7.0 and the remained enzyme activity is over 70 percent after an enzyme liquid is treated at high temperature of 90 DEG C for 5 minutes; meanwhile, the acidic heat-resistant beta-mannase gene has high specific activity and better proteinase resistance; and the engineering bacteria realize high-level expression of the acidic heat-resistant beta-mannase gene and has the advantages of simple fermentation process, low extraction cost, suitability for large-scale industrial production and wide application prospect.
Owner:JINANBESTZYME BIO ENG CO LTD

Epicoccum nigrum DB3 bacterial strain as well as preparation and application thereof

The invention relates to an epicoccum nigrum DB3 bacterial strain as well as a preparation and an application thereof. The preparation method comprises the steps of: 1, placing rotten sea grass in an enrichment culture medium, standing and culturing at room temperature, then coating the enrichment culture medium in a separation culture medium, standing and culturing at a temperature of 30 DEG C for 1-4 days to obtain a wild type flax biological treatment bacterial strain; 2, inoculating the bacterial strain obtained from the step 1 into a flax lignin nutrition culture medium, culturing at a temperature of 28 DEG C for 72 hours; and 3, selecting the bacterial strain with the capacity of degrading the lignin from the flax lignin nutrition culture medium to obtain the epicoccum nigrum DB3 bacterial strain. The epicoccum nigrum DB3 bacterial strain can be applied to a process for preparing spinning flax, hemp, jute or red ramie fibers through peroxide degumming. The epicoccum nigrum DB3 bacterial strain has the characteristics of short growth period, low possibility of being polluted, low treatment cost, mild reaction conditions, strong pollution resistance capacity, good heat-resistant performance, no environment pollution and good quality of the treated fibers. The preparation method has a simple process and is suitable for large-scale industrial production.
Owner:DONGHUA UNIV

Die casting aluminium alloy water-based release agent and preparation method thereof

The invention discloses a die casting aluminium alloy water-based release agent and a preparation method thereof, and relates to release agents and preparation methods thereof. The preparation methodcomprises the steps that engine oil, beewax, organic molybdenum compounds and silicone oil are placed in a water bath kettle to be mixed and heated to be 50 DEG C to 80 DEG C, the materials are stirred with an electric stirring machine, polyoxyethylene aliphatate and polyoxyethylene oleyl ether are slowly added after uniform stirring, hot water is added while stirring, and the materials are emulsified into an emulsion, wherein hot water is tap water or purified water, and the heating temperature is 50 DEG C to 80 DEG C; when the emulsion is cooled to the room temperature, silicon dioxide is added while stirring, and then, stearic acid, ethyl alcohol, triethanolamine, an organosilicone wetting agent, sodium benzoate, sodium phosphate, a thickening agent, sodium nitrite and sorbic acid are added. The release agent prepared through the preparation method contains ultrafine silicon dioxide, silicone oil, and the like, heat resistance is excellent, the surface of a casting is smooth, mold sticking, strain damage or deformation defects are effectively prevented, the lubricating property of the water-based release agent is remarkably improved through lubricating oil, beewax, the organic molybdenum compounds, and the like, and the demolding property is remarkably improved.
Owner:SHENYANG UNIV
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