32results about How to "Overcome the problem of high cost" patented technology

The invention discloses aliphatic polycarbonate with high molecular weight and a preparation method thereof. The method comprises the following steps: in inert atmosphere, gradually heating divalent alcohol and carbonic ester under the action of a catalyst to complete an ester exchange reaction, and completely removing methyl alcohol generated in the process of the reaction to obtain a prepolymerof the aliphatic polycarbonate; and adding a polycondensation catalyst into the reaction system, and carrying out a polycondensation reaction in vacuum to obtain a product. The method has low cost ofraw materials and higher utilization ratio, reduces the cost of the product greatly, overcomes the defect of high cost of biodegradable materials, uses less dosage of catalyst in the reaction process, and avoids the complicated catalyst separation process. The aliphatic polycarbonate obtained by the method is white crystalline solid, has the number average molecular weight of between 6,000 and 2*10<5>, and can be directly used as plastics, does not contain an ether bond in the main chain of the polycarbonate, is a crystalline polymer, and greatly improves the heat-resistant quality of the polymer.

Provided are a flexible, large-area laminated solar battery capable of multi-scale light trapping, and a preparation method therefor. A rigid substrate (100) with a large-scale textured surface is selected and a structure of the substrate surface is transferred onto an antireflection film (300) to enable the antireflection film (300) to form a large-scale textured surface, and then a front electrode (400) with a small-scale textured surface is prepared on the antireflection film (300) to enable the antireflection film (300) and the front electrode (400) to be effectively combined into a multi-scale light trapping structure, such that the light trapping performance of various photoelectric conversion layers of a flexible laminated solar battery is improved, thereby increasing the photoelectric conversion efficiency of the solar battery.

The pile driver drills holes in the accumulated soil layer to build ceramic solar hot water energy storage devices, involving solar hot water energy storage devices. The pile driver uses steel pipe piles to drill holes in the accumulated soil layer, and injects high-pressure water into the steel pipe piles Or high-pressure mud to reduce the friction force of the punching pile and protect the hole wall. The drilling depth is 30 meters. When the rock layer is encountered halfway, the drilling work stops. Insert polyethylene into the hole in the accumulation layer with a depth of 5 meters to 30 meters. The tube-tank combiner forms a heating energy storage system in the accumulation layer through horizontal connecting pipes. The water capacity of the ceramic solar roof and the ceramic solar hot water system insulation water tank is the number of square meters of ceramic solar panels × 30 liters, using local water in spring, summer and autumn The hot water produced at 60°C-100°C is circulated in the heat preservation water tank and the heating energy storage system in the soil layer, so that the solar energy obtained in spring, summer and autumn is converted into energy storage in the soil layer, and the energy storage in the soil layer is used in winter Heated hot water can be used to heat buildings, greenhouses, and biogas digesters.

The invention provides a device for removing a steel bundling machine bundling wire oxide skin. The device is mainly composed of a motor, a wire inlet guide wheel set, an oxide skin removing wheel set, a bundling wire compressing device, a gearbox and a wire outlet guide wheel set, wherein the motor, the wire inlet guide wheel set, the oxide skin removing wheel set, the bundling wire compressing device, the gearbox and the wire outlet guide wheel set are mutually connected. The wire inlet guide wheel set is installed on a plate on the upper left portion of the gearbox through a pin roll, the oxide skin removing wheel set is installed on a plate on the right side of the wire inlet guide wheel set through a pin roll, the bundling wire compressing device is installed on a plate on the upper portion of the gearbox through a pin roll, the wire outlet guide wheel set is installed on a plate on the upper right portion of the gearbox through a pin roll, and the motor is installed below the left portion of the gearbox through bolts. The device for removing the steel bundling machine bundling wire oxide skin has the advantages that the problem that cost is high in steel packaging bundling wire oxide skin removing in the prior art is solved, bundling wires can be directly used on a bundling machine without acid pickling, and the effect of removing the bundling wire oxide skin is good.