8 results about "Dispersion stability" patented technology

The invention discloses a high-refractive-index nano-composite optical adhesive and a preparation method thereof, and belongs to the technical field of optical transparent adhesives. The optical adhesive is prepared by taking a polyurethane acrylate oligomer with a specific structure as matrix resin, introducing surface-modified barium titanate and zirconium oxide core-shell nanoparticles as a functional filler, and matching with an active diluent, a photoinitiator and a silane coupling agent in a specific proportion. Through the design of the core-shell structure, the core problems that the high-refractive-index nanoparticles are easy to agglomerate in an organic resin matrix, the dispersion stability is poor and the bonding force with a matrix interface is weak are effectively solved. The prepared optical adhesive has a refractive index of more than 1.65, a light transmittance of more than 99% and a haze of less than 0.3% after being cured, has excellent bonding strength, weather resistance and long-term use stability, and is especially suitable for precise lamination of high-end display devices (such as OLEDs (Organic Light Emitting Diodes) and micro-lens arrays).

The invention provides a preparation method of an acoustic / photosensitizer-manganese dioxide nanoparticle and a product thereof. According to the method, firstly, a potassium permanganate reduction method is adopted to precisely synthesize the high-purity MnO2 nano-substrate, and according to the method, the size uniformity and dispersion stability of nano-particles can be precisely controlled by regulating and controlling the pH value and temperature of a reaction system and the concentration of a reducing agent. On the basis, amphiphilic high-molecular polyethylene glycol-polycaprolactone (PEG-PCL) is modified on the surface of the MnO2 nanometre. The whole preparation process is green and mild, and complex equipment is not needed; the reaction conditions are mild, nanoparticles are uniform, and the acoustic / photosensitizer can be combined and applied to an imaging technology to realize real-time monitoring.

The application discloses a kind of silicon carbide grinding slurry based on multimodal dispersion technology and preparation method thereof, belong to silicon carbide grinding slurry technical field.The method is combined by chemical modification and multi-physical dispersion means, realize the efficient stable dispersion of silicon carbide micro powder, while reducing surface damage in the process of grinding.The specific steps include: surface treatment of silicon carbide, preparation of nitrogen heterocyclic crown ether based silane coupling agent, preparation of surface modified silicon carbide, multimodal dispersion treatment.The application reduces the surface energy of silicon carbide by chemical modification, combined with multi-physical dispersion means to inhibit particle agglomeration, significantly improve the dispersion stability of slurry;At the same time, the flexible interface formed by modification layer can buffer the rigid collision in the process of grinding, reduce deep scratch and subsurface damage, improve the flatness and smoothness of the surface to be ground, suitable for high-end optical communication devices, power electronic devices and other fields of silicon carbide substrate ultra-precision grinding processing.

This invention discloses a rare-earth-doped glass polishing powder, its preparation method, and its applications. The polishing powder uses cerium oxide as a matrix, and introduces one or more rare-earth elements from lanthanum, yttrium, dysprosium, or erbium through co-precipitation. This allows the rare-earth elements to be uniformly doped into the cerium oxide lattice, forming a stable solid solution structure. Calcination is then used to control the grain size and oxygen vacancy distribution. Subsequently, a phosphate ester modifier is used to modify the surface of the polishing powder to improve particle dispersibility and slurry stability. The rare-earth-doped glass polishing powder prepared by this invention exhibits a high material removal rate (1.52-1.63 mg / min) and a low post-polishing surface roughness (1.63-1.82 nm) during glass polishing, while also demonstrating excellent dispersion stability and consistency in use. This invention is applicable to optical glass, display glass, and ultra-clear glass, and has significant industrial application value.

The present application relates to the technical field of high light flash powder, and particularly relates to an anti-yellowing high light flash powder, a preparation method and application thereof. The anti-yellowing high light flash powder is coated with a silver layer on the surface of a glass powder, and from inside to outside on the surface of the silver layer, a chemical anchoring layer, a surfactant layer and a protective film layer are sequentially coated; wherein the chemical anchoring layer, the surfactant layer and the protective film layer form a hierarchical structure to jointly constitute an anti-oxidation layer. The present application also discloses a preparation method of the anti-yellowing high light flash powder and application thereof in paint. The present application also discloses a paint, which comprises: a film-forming material and the anti-yellowing high light flash powder. The present application selects lipoic acid, silicone oil and a surfactant (lecithin and betaine) as the antioxidants, which cooperate with each other to form an anti-oxidation layer with a hierarchical structure, so that the anti-oxidation performance of the flash powder can be greatly improved, yellowing can be prevented, the high light flash powder can also maintain good dispersion stability and hydrophobicity, and good gloss and reflectivity can be maintained.

The application discloses a kind of radiation protection high flame-retardant special optical cable and preparation method, bismuth oxide and barium sulfate are first mixed with matrix resin to form a basic shielding premix, then tungsten oxide is synchronously post-added with zinc borate and aluminum diethyl phosphinate, and the outer sheath layer is formed by flame-retardant system dispersion, homogenization granulation, extrusion coating and crosslinking. The method improves the dispersion stability, extrusion stability and flame-retardant carbonization holding effect of high filler sheath material through stage wetting and torque process control, so that the outer sheath layer still maintains high radiation shielding ability after burning.

This invention provides an optical thin film, which is prepared from a graft copolymer and is a cellulose ester optical thin film with stable wavelength dispersion characteristics. The optical thin film provided by this invention comprises a cellulose ester polymer matrix with a total acyl content of less than 60.5% and aromatic polymer side chains covalently grafted onto its main chain. After uniaxial stretching and orientation, within a stretching ratio range of 1.1 to 1.6, the ratio of its out-of-plane birefringence at wavelengths of 450 nm to 550 nm does not change by more than 3% (i.e., the dispersion stability coefficient S ≤ 3%), exhibiting good wavelength dispersion stability.

The present application relates to the technical fields of chemical mechanical polishing, in particular to a preparation method of an environmentally-friendly water-based grinding and polishing liquid for optical glass.The present application overcomes the shortcoming of poor polishing effect of traditional polishing liquid.The main preparation method is as follows: at 45-50 DEG C, nano cerium oxide emulsion, bio-based chelating agent and surfactant are subjected to high shear in-situ anchoring to realize chemical modification of the abrasive surface; high molecular dispersant is added to improve dispersion stability; organic amine is used to adjust pH to alkaline, and the product is obtained through ultrasonic and precision filtration. The traditional strong alkali and fluoride system is abandoned, which is environmentally friendly, improves the polishing rate and reduces the surface roughness. The slurry has good monodispersity, low residue and process stability, solves the contradiction between scratch control and efficient processing, and is suitable for precision polishing of optical glass.