34results about How to "Raise the starting temperature" patented technology

Compositions and articles of manufacture made therefrom for use in high temperature application, such as automotive reflectors, have a minimum haze onset temperature of about 205° C. and are made from a transparent, miscible blend of from about 30 to about 70 weight percent of a polyetherimide sulfone comprising greater than or equal to 50 mole percent of the polymer linkages have an aryl sulfone group and from about 70 to about 30 weight percent of a polyetherimide or polyimide.

The invention belongs to the field of wood adhesives, and relates to curing agents, in particular to a composite curing agent for MUF resin adhesives, which consists of the following components by weight percentage: ammonium persulfate 15-35wt%, hexamethylenetetramine 20-28wt%, p-toluenesulfonic acid 18-27wt%, ethanolamine 18-27wt%. The present invention also applies the composite curing agent for the MUF resin adhesive to the production of medium and high density fiberboards. The composite curing agent disclosed by the invention has excellent latent properties, high hydrogen ion release initial temperature, but can promote fast curing of resin at high temperature; excellent curing performance; long pot life and the like. After the curing agent is blended with the adhesive, it can effectively prevent the pre-curing problem of the adhesive in the pipeline air-drying process, and can quickly release hydrogen ions during the high-temperature hot-pressing process, so that the adhesive can be quickly cured. Therefore, not only the comprehensive performance of the plate is improved, but also the production efficiency is greatly improved.

The invention relates to a preparation method of a lightweight polypropylene material, comprising the following steps: (1) uniformly mixing sodium bicarbonate and citric acid to obtain a microporous foaming agent for polypropylene; (3) Microcellular foaming agent for silicone-coated polypropylene, polypropylene, filler, antioxidant, heat stabilizer, microcapsule red The thucitol is mixed evenly to obtain the finished product. The present invention improves the thermal decomposition starting temperature of sodium bicarbonate by adding citric acid and microcapsule erythritol, narrows the decomposition temperature range, and improves the foaming effect; wherein the thiritol material is an excellent medium-temperature phase It is a change material with a phase transition temperature of 119-124°C. When the temperature rises above the phase change temperature, erythritol undergoes a phase change, absorbing heat to slow down / prevent the temperature rise, thereby delaying the thermal decomposition of sodium bicarbonate as a foaming agent and improving the foaming effect.

The invention relates to a preparation method of enhanced modified PBT copolyester, which is a copolyester that can be used in the field of film and engineering plastics. Formic acid, inorganic crystallization nucleating agent, terephthalic acid or dimethyl terephthalate, and 1,4-butanediol are liquid-phase polymerized to obtain reinforced modified PBT polyester in one step. This method improves the mechanical properties and heat resistance of PBT, and can avoid the disadvantages of glass fiber blended modified PBT polyester, such as poor toughness, strong hygroscopicity, poor fluidity, high injection temperature and pressure, and serious equipment wear and tear.

The invention relates to a boehmite covered graphite composite negative electrode material as well as a preparation method and application thereof to a lithium-ion battery. The composite negative electrode material comprises a graphite substrate which is used as an inner core, and a cladding layer which is formed by uniformly and continuously cladding boehmite type aluminum oxide on the surface ofthe inner core. The method comprises the following steps: 1) mixing the graphite substrate, a boehmite solution and water; 2) carrying out spray drying on an obtained mixture to obtain the boehmite covered graphite composite negative electrode material. The method provided by the invention has the advantages of low price of raw materials, simple and environment-friendly process and easiness for industrialization; the prepared covered graphite negative electrode material has stable performance; compared with an uncovered graphite substrate, the obtained composite material has the advantages ofhigh jolt ramming, high compaction, high wetting property, high pole piece peeling strength and low pole piece rebound performance. A boehmite covering layer is introduced, so that thermal reaction between electrolyte and graphite can be effectively inhibited and a thermal runaway risk caused by extreme conditions including battery short circuit and the like is prevented.

The invention provides a high-speed direct-delivery direct-rolling system and method for wire bar continuously-cast slabs. The system comprises a small-radius high-drawing-speed continuous casting machine, a fast hydraulic shear, a cut slab roller table, a slab discharging roller table, a grouped cast slab hot-delivery roller table, a single-cast-slab delivery roller table and a wire bar rolling mill which are sequentially and compactly arranged. A transverse steel transfer machine is arranged between the slab discharging roller table and the grouped cast slab hot-delivery roller table. A steel bar splitting machine is arranged between the grouped cast slab hot-delivery roller table and the single-cast-slab delivery roller table. Cast slabs are gathered into groups on the slab discharging roller table and transferred into the grouped cast slab hot-delivery roller table from the transverse steel transfer machine. The grouped cast slabs are split into single cast slabs through the steel bar splitting machine and delivered to the wire bar rolling mill through the single-cast-slab delivery roller table for rolling. The small-radius high-drawing-speed continuous casting machine is efficient in continuous casting, the drawing-out temperature of the cast slabs is high, the shape of the cast slabs is regular, and the temperature loss is small; and the cutoff speed of the cast slabs is high, and the initial temperature of the cast slabs is high. All streams of the cast slabs are grouped at a high speed through the transverse steel transfer machine and delivered in a grouped manner through the hot-delivery roller table for steel rolling, and by means of the manner, the temperature drop is extremely small in the delivery process of the cast slabs.

The invention discloses a full-automatic low-energy-consumption warming method of a greenhouse. The full-automatic low-energy-consumption warming method comprises the following steps: mounting a warming system, setting, keeping heat, heating by solar energy, electrically heating, and carrying out heat-transfer cycle. The warming system comprises a warming device with heating and heat preservation functions, an electric temperature control circulating water pump and a plurality of heat radiation sheets coated with heat absorption coatings, wherein the warming device, the electric temperature control circulating water pump and the heat radiation sheets are connected in sequence to form a heat-transfer cycle loop. The starting temperature of repeatedly heating a heat transfer medium is very high through the heat preservation function of the warming device and the heat absorption function of the heat radiation sheets coated with heat absorption materials, so that the energy consumption is extremely saved, the energy efficiency is high and the warming cost is saved. Overall, the full-automatic low-energy-consumption warming method has the advantages of energy conservation, environment friendliness and no pollution, uniformity in warming, low cost and high energy efficiency, full-automatic warming, water conservation, and flexibility and convenience for setting, and can be widely popularized and applied.

The invention discloses a method for modifying epoxy resin through amino-terminated hyperbranched polymer-grafted graphene oxide. The method comprises the following steps: preparing graphite oxide from flake graphite utilized as a raw material by adopting a Hummers oxidation method, adding the graphite oxide into a beaker, adding distilled water and forming a graphene oxide mixed solution by virtue of ultrasonic waves; stirring for dissolving triethylene tetramine in N,N-dimethylformamide, raising the temperature to 55-65 DEG C, dropwise adding a mixed solution of methyl methacrylate and methanol, continuously raising the temperature to 80-120 DEG C and reacting for 6-10 hours to get an amino-terminated hyperbranched polymer; further adding the graphene oxide mixed solution and NaOH, regulating the pH value to be 5-10, performing ultrasonic dispersion for 2-8 hours at the temperature of 80-120 DEG C, evaporating the methanol, cooling to room temperature, adding water to precipitate a product, drying to get the amino-terminated hyperbranched polymer-grafted graphene oxide capable of toughening and modifying the epoxy resin. The method disclosed by the invention is wide in raw material source, simple in preparation process, pollution-free, lower in cost and beneficial to industrial large-scale production.

The invention discloses a high temperature resistant cross-linked polyolefin foamed material and a preparation method thereof. The raw materials include, by weight, 60-90 parts of polyolefin resin, 2-20 parts of a foaming agent and 0.1-10 parts of processing aids. Specifically, the polyolefin resin includes polyolefin resin with a maximum crystallization rate temperature T_(c, max) of lower than or equal to 100DEG C, and the polyolefin resin with the maximum crystallization rate temperature T_(c, max) of lower than or equal to 100DEG C accounts for more than or equal to 40% of the mass fraction of the polyolefin resin. The preparation method includes: mixing polyolefin, the foaming agent and the processing aids; performing melt extrusion into sheets; then subjecting the sheets to high-energy electron irradiation crosslinking treatment; and then heating the irradiated sheets, conducting foaming by a foaming furnace, then carrying out cooling shaping, and performing rolling-up. The cross-linked polyolefin foamed material provided by the invention increases the difference of temperature in a tensile zone and the crystallization temperature in the foaming process, and can increases thestarting temperature of heat shrinkage produce by the material and reduce the heat shrinkage rate.