41results about How to "No obvious crack" patented technology

The invention discloses a preparation method of a flexible silica aerogel, relating to a silica aerogel. The invention provides the preparation method of the flexible silica aerogel, which takes methyl alkoxy-series silane as a silicon source precursor. The preparation method comprises the steps of mixing methyl trimethoxysilane or methyl trimethoxysilane, an anhydrous ethanol solution and water, further adding hydrochloric acid, regulating the pH value of the solution to 2-2.5, then adding ammonia water to obtain a sol, standing, then preparing a wet gel, further aging the wet gel, and then drying to prepare the flexible silica aerogel. The prepared flexible silica aerogel has the advantages of low density and high porosity, and simultaneously overcomes the shortcomings of poor integrity and great brittleness. According to the preparation method, the complicated steps of complex solvent exchange and gel modification are not required, so that the operation is simple and easy, the process is controllable, the cost is low, the period is short, and the continuous production can be realized.

The invention relates to the technical field of iron and steel metallurgy, in particular to a method for controlling surface cracks of welding wire steel continuous casting slabs. It specifically includes the following key process steps: 1) Pretreatment of molten iron, 2) Converter treatment has two operation modes, 3) Special ferrosilicon 10kg / ton steel is used for the alloy, 8kg / ton steel of low-phosphorus manganese ferroalloy is used with metal manganese, 4) Refining Treatment process: The temperature of the LF furnace is required to be above 1560°C. The LF furnace adjusts the addition of lime and ferro-titanium according to the S and Ti content of the furnace, and raises the temperature to 1580-1600°C at one time, and the basicity of the top slag is controlled at 1.8-2.4 ;5) Ensure that the treatment period is ≥ 30min, and the stirring period is at least 2-3min; 6) After the refining treatment is completed, the machine is poured after weak blowing for 3‑5min; 7) The amount of secondary cooling water is optimized. The shell of the invention effectively controls TiN inclusions, avoids flocculation of molten steel, and controls microcracks on the surface of casting slabs.

The invention discloses ultra-flexible coated abrasive cloth, and relates to the technical field of coated abrasive tool products. The ultra-flexible coated abrasive cloth comprises a substrate, an abrasive and a composite adhesive layer; the substrate and the abrasive are coated with the composite adhesive layer, and the abrasive is fixed to the substrate through the composite adhesive layer; thesubstrate comprises a base material and a flexible adhesive layer, and the composite adhesive layer comprises a bottom adhesive layer, a composite adhesive layer body and a coating layer which are distributed from bottom to top in sequence; the flexible adhesive layer comprises one layer of or combination of multiple layers of an upper adhesive layer, a lower adhesive layer and an inner adhesivelayer, the upper adhesive layer and the lower adhesive layer are arranged on the upper surface and the lower surface of the base material correspondingly, and the inner adhesive layer is distributed in the base material; and the base material adopts a cloth base of which the absolute dry weight is 25-180 g / m<2>. The good surface evenness of the coated abrasive cloth can be obtained, the flexible bending radius is 1-3 mm, the ultra-flexible coated abrasive cloth is suitable for grinding of light-load planes and curved surfaces, is resistant to breaking and blocking during grinding, and has thecharacteristics of being good in economical efficiency, light and thin.

The invention discloses a resin compositionc which comprises the following components in parts by weight: 10-40 parts of bismaleimide modified epoxy, 20-50 parts of flexible epoxy resin, 5-20 parts of polyvinyl butyral, 5-20 parts of phenoxy resin, 380-520 parts of heat-conductive padding, 5-12 parts of curing agent, 2-5 parts of coupling reagent, 0.05-0.85 part of curing accelerator and 2-6 parts of additives. According to the resin compositionc disclosed by the invention, the bismaleimide modified epoxy is introduced, so that the resin compositionc has excellent heat resistance and voltage resistance, and meanwhile, the flexible epoxy resin, the phenoxy resin, the polyvinyl butyral and the heat-conductive padding are added, so that the novel resin compositionc has excellent flexibility, heat dissipation, insulation, adhesion and heat resistance. A metal copper-clad plate prepared from the resin compositionc disclosed by the invention has the characteristics of high heat conductivity coefficient, high breakdown voltage, high peel strength, high heat resistance, halogen-free flame retardant and excellent flexibility.

The invention discloses a method for uniform distribution of a PTFE (polytetrafluoroethylene) binder and electrode key component materials and an application in the battery industry. The method comprises the steps of carrying out ultrasonic dispersion or high-speed mechanical stirring on a water diluent of PTFE emulsion to obtain a solution 1; mixing conductive carbon powder, an electrode active component, a surfactant and water, then carrying out ultrasonic dispersion or high-speed mechanical stirring on the mixed solution to obtain a solution 2; preheating and mixing the solution 1 and the solution 2 to obtain a solution 3; carrying out high-speed stirring on the solution 3 for 1-6 hours under a constant temperature condition, standing and cooling to the room temperature so as to obtaina layered solid-liquid mixture; and removing a supernatant of the solid-liquid mixture to obtain a PTFE-conductive carbon powder-electrode active material ternary compound. The method realizes the uniform distribution of the binder, the conductive carbon powder and the electrode active material in an electrode, avoids the agglomeration of single component, improves the utilization ratio of the electrode active material and improves the discharge performance and operation stability of the battery; and the uniform distribution of each component in the electrode structure is obtained through preparing electrode slurry, there is no obvious secondary agglomeration, and the surface of the electrode is smooth, flat and free of obvious cracks.

The invention belongs to the field of processing and application of straw and particularly relates to a straw pelleting process. The process mainly comprises the steps of 1), performing coarse grinding and feeding the ground straw into an ensiling pool to perform ensiling fermentation treatment; 2), drying to obtain ground straw with the water content of 9-15%; 3), performing fine grinding to obtain straw fiber with the particle size of 40-50 meshes per square inch and placing the straw fiber into a storage bin for storage through an air-assisted dust removal system; 4), pelleting, conveying the straw fiber to a ring die pelleting machine and performing compression molding by using a ring die and a compression roller to obtain rodlike straw particles with the density of 1-1.2g / cm3; and 5), performing cooling molding, placing the compressed straw particles into a cooler and cooling the straw particles to the room temperature through air cooling to obtain formed particles with smooth surfaces. According to the process, the straw is used fully, the pelleting effect is good, and the formed straw particles are smooth in surface and free from obvious cracks, are clean energy, can be used as base materials for culture of fungi or supplementary feed of livestocks and are convenient to popularize and apply in a large scale.