61results about How to "Composite process is simple" patented technology

The invention discloses a biaxially stretched polypropylene film for paper-plastic glue-free compounding and a preparation method thereof. The film includes a surface layer, a core layer and a core layer which are arranged in sequence and co-extruded, and can be directly combined with paper materials and pre-printed paper. The composite functional layer of the material or the film containing this layer, the upper surface layer is arranged between the surface layer and the core layer, and the next surface layer is arranged between the core layer and the functional layer. The surface layer, the upper surface layer, the core layer, the lower surface layer and the functional layer are co-extruded by two-way stretching according to the corresponding components. The preparation method of the present invention is as follows: the selected raw materials are fed into the extruder to be plasticized into a melt, and the melt is quenched into a thick sheet by casting a cast sheet, and the thick sheet is biaxially stretched into a film, and the film is corona treated or Flame treatment to form the mother film, the mother roll is subjected to aging treatment, and finally cut into film products. The biaxially stretched polypropylene film of the invention can realize the glue-free composite of paper and plastic, and also has the advantages of simple structure, high heat-sealing strength and high peeling strength, which is beneficial to the manufacture and promotion of products.

The invention relates to a preparation technology of a high-performance and abrasion-resistant material, in particular to a multi-scale ceramic / metal composite abrasion-resistant material and a preparation method thereof. The resource-saving high-performance and abrasion-resistant material is obtained by using a high-performance foamed ceramic / metal double continuous phase composite material as an abrasion-resistant matrix, using a high-toughness metal as a constraint framework and using a casting method. The abrasion-resistant material has multi-scale composite structural characteristics, the abrasion-resistant unit is compounded in micron and millimeter scales, and the abrasion-resistant unit and the constraint framework are compounded in a centimeter scale. The structure can well realize reasonable matching of high abrasion resistance and high strength and toughness of the material, the abrasion resistance and the impact toughness of the material are respectively over 7 times and 10 times those of high-chromium cast iron, and meanwhile, scarce alloy elements (Cr, Ni, Mo and the like) are not used. The material is applied to large engineering equipment of crushing, excavating, transporting and the like, is excellent in abrasion resistance, low in cost and convenient to use, greatly prolongs the service life, greatly improves the production efficiency, and has good social benefit and economic benefit.

The invention discloses a production method and a production system of an ultrahigh molecular weight polyethylene compound oil pipe. The method utilizes the memory property of the ultrahigh molecular weight polyethylene material and a special composite technology: conducting hole shrinkage treatment on an ultrahigh molecular weight polyethylene lining pipe with outer diameter larger than the inner diameter of a steel pipe, sheathing in the steel pipe, heating to restore inner diameter of the ultrahigh molecular weight polyethylene lining pipe, and forming the lining pipe with the steel pipe into an integral structure to reach a compactness and firmness without layering and stripping. By introducing additives, the invention greatly improves liquidity of the ultrahigh molecular weight polyethylene in order to produce the inner lining pipe with small wall thickness and reduce cost. The ultrahigh molecular weight polyethylene compound oil pipe provided by the invention comprehensively reserves specific superior performances of good memory property, high impact resistance, good temperature resistance, wear resistance, corrosion resistance, wax precipitation and fouling resistance of ultrahigh molecular weight polyethylene pipe. The invention also discloses a production system supporting the production method.

The invention relates to a graphene oxide and polymer based electromagnetic shielding foam composite material and a preparation method thereof. Flexible polymer foams are selected and are immersed in a graphene oxide aqueous dispersion, then the immersed polymer foams are dried and reduced, and a layer of three-dimensional continuous graphene film structure is formed between a foam skeleton and a skeleton. The graphene film between the skeletons is conducive to improving the electromagnetic wave reflecting surface and beneficial to electromagnetic wave absorption. Through compounding and reduction of the polymer foams and graphene oxide, compounding of flexible polymer foams and graphene with high electromagnetic shielding properties can be realized, the three-dimensional continuous network structure of the polymer foams and graphene guarantees maximization of mechanical and electromagnetic shielding properties, under 80% compressive strain, the obtained foam composite material is compressed repeatedly for 1000 times, the recovery rate is greater than or equal to 95%, and the electromagnetic shielding effectiveness is greater than or equal to 40dB. The method provided by the invention has a simple compounding process, and can realize large-scale production.

The invention discloses a method for manufacturing an inner covered stainless steel compound steel pipe which has good combination quality, simple working process, lower cost as well as favorable tissue and property of a stainless steel layer and a carbon steel layer. The method for manufacturing the inner covered stainless steel compound steel pipe comprises the following steps: cleaning a stainless steel thin-wall welded pipe, a carbon steel pipe and the surface of a pure copper foil after solution treatment; wrapping the pure copper foil outside the stainless steel thin-wall welded pipe, and then placing the pure copper foil and the stainless steel thin-wall welded pipe into the carbon steel pipe together; mutually sleeving an inner pipe, the pure copper foil and an outer pipe; carrying out cold drawing so that the inner pipe, the pure copper foil and the outer pipe are closely attached so as to form an interference-fit compound pipe blank; placing the interference-fit compound pipe blank into a diffusion annealing furnace filled with protective gases, heating at the temperature of 900-950 DEG C, preserving the temperature for 10-60 minutes, and cooling the compound pipe blank to normal temperature at the speed of 100-200 DEG C / minute for diffusion bonding after the compound pipe blank is taken out of the diffusion annealing furnace.