45results about How to "Promote orderly arrangement" patented technology

The invention relates to a composite material grinding roller and a manufacturing method thereof. The composite material grinding roller comprises a metal roller body and a plurality of wave-shaped composite bodies, wherein the wave-shaped composite bodies are embedded into a working plane of the metal roller body at equal intervals, are integrated with the metal roller body and are wave-shaped ceramic reinforcements or wave-shaped structural bodies composited from wave-shaped ceramic reinforcements and a metal substrate; the wave-shaped ceramic reinforcements are prepared by curing ceramic particles. The manufacturing method of the composite material grinding roller comprises the following steps: firstly designing and manufacturing the wave-shaped composite bodies of required sizes; then carrying out casting forming; and finally, cooling and processing, so as to obtain the composite material grinding roller. By virtue of design of the wave-shaped ceramic reinforcements, the composite material grinding roller has the structural characteristics that the ceramic reinforcements are easily and orderly arrayed in a mold cavity and are applicable to mechanical operation; the displacement and the malposition of each individual ceramic reinforcement in a casting process are effectively avoided; the whole displacement of the ceramic reinforcements in a working condition use process is avoided, and particularly, the composite material grinding roller is a secondarily poured large-sized composite material grinding roller.

The invention discloses a polycarbonate (PC) composite material and a preparation method thereof and a method for manufacturing an LED (Light Emitting Diode) lamp housing. The composite material is prepared from the following components in percentage by weight: 84-98.59 percent of polycarbonate resin, 0.01-8 percent of light diffusant, 1-5 percent of silicone resin, 0.1-1 percent of processing agent, 0.1-1 percent of thermal stabilizer, 0.1-1 percent of light stabilizer and 0.1-1 percent of processing aid. In the invention, the light diffusant is processed by using epoxy resin, so that the interfacial bond of the light diffusant and polycarbonate is improved, and the solvent-stress-resistant cracking performance of the PC composite material is decreased. Ordered arrangement of polycarbonate molecules is increased and the internal stress is reduced under optimized injection mould temperature; and the minimum influence of a toughening component on the transparency of a final lamp housing product is guaranteed by adding the silicone resin with refractive index of 1.587 and toughening effect. The reduction in impact strength of the lamp housing product brought by higher mould temperature during injection molding can be compensated by adding the silicone resin. The light diffusion PC material with a balance among light transmittance, haze and diffusion angle is obtained by adding the light diffusant, so that an LED lamp emits non-dazzling, soft and pleasant light.

The invention discloses a preparation method of form-adjustable anisotropic asymmetric emulsion particles. The method comprises steps as follows: adding a PVDF (polyvinylidene fluoride) seed emulsion to a reaction container equipped with a mechanical stirring and reflux condensing tube and a nitrogen introduction port, performing ultrasonic dispersion for 40 min, adding monomers and an initiator, meanwhile, starting stirring, continuously feeding nitrogen, adding ligands and a catalyst after 1.5 h, performing vacuum pumping and nitrogen feeding operations simultaneously, and then performing polymerization at the reaction temperature of 20-50 DEG C for 1-7 h; then performing decompression and low-temperature drying on the emulsion until the emulsion is constant in weight so as to prepare the anisotropic asymmetric emulsion particles. The catalyst is metallic copper. According to the method, the anisotropic asymmetric particles are successfully prepared through seed emulsion polymerization and SET-LRP (single electron transfer-living radical polymerization), and forms and sizes of the emulsion particles can be effectively controlled through selection of different seed monomer mass ratios, polymerization reaction temperatures and catalyst sizes.

The invention belongs to the field of high polymer materials and particularly relates to a polyimide film with a low thermal expansion coefficient and a preparation method of the polyimide film. The polyimide film has the following structural formula shown in the specification, wherein R1 and R3 are residues of two different tetracarboxylic acid dianhydride monomers, and R2 and R4 are residues of two different di-primary amine monomers. The preparation method is a multi-step polymerization method, firstly, two polyimide acid solutions with different structure units are obtained through polymerization respectively, then the solutions are mixed and then polymerized, finally, heating drying is carried out, and the polyimide film with the low thermal expansion coefficient is obtained. Compared with the prior art, the polyimide film with the low thermal expansion coefficient introduces ester bonds / amide, imidazole / oxazole and other structure units into molecular structure design at the same time, the interaction force among molecules is improved, the thermal expansion coefficient of the polyimide film is effectively reduced, meanwhile, the thermal expansion coefficient of the polyimide film can be adjusted and controlled by adopting different formulas, and the matching problem among different substrate materials is solved.