36results about How to "Improve double bond conversion rate" patented technology

The invention discloses UV fast curing optical fiber coloring ink which is prepared from the following components in percentage by weight: 25 to 35 percent of color paste, 20 to 40 percent of acrylateresin, 10 to 30 percent of an acrylate reactive diluent, 12 to 20 percent of a photoinitiator, 4 to 10 percent of a leveling agent and 1 to 10 percent of a defoamer. The UV fast curing optical fibercoloring ink prepared by the invention is high in coloring strength, uniform in particle size distribution, not easy to settle, high in surface smoothness and relatively good in stripping property, has the most important characteristics of extremely fast curing and extremely high double bond conversion rate, and can be suitable for relatively high coloring speed.

The invention belongs to the field of 3D printing, and particularly relates to a washable high-temperature-resistant conductive photocuring material for 3D printing and a printing process thereof. The washable high-temperature-resistant conductive photocuring material comprises the following components in parts by mass: 10 to 30 parts of waterborne epoxy acrylate, 10 to 30 parts of waterborne polyester acrylate, 10 to 30 parts of acrylate monomer, 10 to 30 parts of high-strength acrylate oligomer, 1 to 10 parts of a photoinitiator, 1 to 10 parts of a metal filler and 1 to 10 parts of gas-phase nanometer silicon dioxide, wherein the completely cured strength of the high-strength acrylate oligomer is not lower than 90 MPa. The invention also provides a printing process of the material. The characteristics of high conductivity, high migration resistance and stable conductivity of silver-plated copper powder are matched with light curing treatment, so a continuous conductive network is formed.

The invention belongs to the field of dentistry, and particularly relates to a dlp type 3d printing photocuring material for a clinical dental temporary crown, which takes nano organic-inorganic hybrid UV resin, high-strength aliphatic urethane acrylate, high-toughness aliphatic urethane acrylate and a free radical acrylate monomer diluent as main bodies and is matched with an inorganic silver antibacterial agent and a pigment, the dLp type 3D printing photocuring material for the clinical dental temporary crown is prepared from a 385nm wavelength free radical system composed of a photoinitiator, and the problems of poor material performance stability, poor size stability, poor toughness, poor mechanical property, medical risk and the like are effectively solved by using a special printingprocess and a post-treatment process.

The invention relates to a preparation method for a highly-weatherable ultraviolet-curable polyurethane coating. The preparation method comprises the following steps: allowing active epoxy groups located at two ends of epoxy-terminated polydimethylsiloxane to react with acrylic acid, introducing a carbon-carbon unsaturated double bond, and carrying out a reaction with isocyanate so as to prepare the highly-weatherable ultraviolet-curable polyurethane coating. The highly-weatherable ultraviolet-curable polyurethane coating provided by the invention has excellent properties like good wear resistance, chemical product resistance and oil resistance, strong adhesion force and low-temperature curability of a polyurethane coating; meanwhile, the coating has the characteristics of weather resistance and high-temperature resistance of an organosilicon material due to addition of an organosilicon chain into a molecular structure. The coating obtained by using the preparation method provided by the invention has good ultraviolet-curing activity, high double-bond conversion rate and good component compatibility. The preparation method provided by the invention has the following advantages: preparation steps are simple; used raw materials are frequently-used products in a coating industry; reaction conditions are mild; and a product has low comprehensive cost and is applicable to large-scale popularization and mass production.

The invention discloses a 3D printing photocuring material and an underwater curing after-treatment processing technology thereof. The photocuring material is mainly prepared from, by weight, 20-50% of UV-curing nanometer organic-inorganic silicon hybridized resin, 5-25% of UV-curing self-repairing resin, 0.5-20% of fluorine-modified resin, 10-40% of a monomer diluent, 0.1-5% of a photoinitiator,0.1-1% of a pigment, 0.1-5% of a filler and 0.1-3% of an auxiliary agent. The 3D printing photocuring material is firstly subjected to curing forming by 3D printing DLP equipment with the UVA wavebandof 385 nm, and then subjected to the underwater curing after-treatment processing technology. The 3D printing photocuring material obtained by means of the technology has the tensile strength of 68-80 Mpa and the bending strength of 53-61 Mpa, the scratch resistance is excellent, tiny scratches can be quickly repaired, no mark is left, the surface smoothness level is nabla 10-nabla 11, the size change is within the range of 0-0.10 mm after long-time placement, and the light aging resistance reaches 300 h.

The invention discloses single-component long-wavelength photoinitiators, and relates to the field of photocurable materials. Photoinitiators are synthesized by a Claisen-Schmidt reaction, alpha-H-free aldehyde participating in the reaction comprises a carbazole derivative, and the carbazolyl group enhances the conjugation of the molecular structure of the photoinitiators to lengthen the maximum absorption wavelength of the synthesized products. The initiators have a good solubility in most photopolymerizable monomers, have an ultraviolet absorption peak matched with a corresponding LED lightsource, and can initiate polymerization of various monomers and achieve a good curing effect under the illumination of the LED light source. The invention also discloses a preparation method of the single-component long-wavelength photoinitiators. The preparation method has the advantages of simple conditions and mild conditions.

The invention provides a polymerizable monomer composition for dental restoration as well as a preparation method and application of the polymerizable monomer composition. The polymerizable monomer composition comprises a combination of a polymerizable monomer, an initiator and a cross-linking agent. By adding the cross-linking agent, the double-bond conversion rate of the polymerizable monomer is improved, and the residual rate of the polymerizable monomer is reduced; as the polymerizable monomer is added into a resin ceramic repair material, the prepared resin ceramic repair material can have high strength and toughness, so when the resin ceramic repair material is applied to tooth repair, the resin ceramic repair material can keep a good form during processing or during wearing and using by a patient; and the water absorption value and the dissolution value of the resin ceramic repair material are reduced, and the mechanical strength is improved, so the service life of the resin ceramic repair material is prolonged, and market requirements are met.

The invention provides a photochromic composition product suitable for EB curing and a preparation method thereof, the photochromic composition product comprises polyol, acrylate diol, diisocyanate, a catalyst, a polymerization inhibitor, a diluent, photochromic powder, an antioxidant, an ultraviolet absorber, a leveling agent and a defoaming agent, a photochromic composition is obtained, a substrate material is coated with the photochromic composition, and through infrared lamp radiation, under the protection of nitrogen, EB radiation curing is carried out to form a film. According to the invention, carbon-carbon double bonds of acrylate are introduced into a polyurethane system, a plurality of flexible structures and a plurality of rigid structures are simultaneously grafted on a molecular chain segment by a prepolymerization method, and finally, the photochromic composition is well attached to the surface of a transparent substrate through EB radiation curing. The damage of ultraviolet light to the photochromic powder is avoided, and the coating curing time is shortened, so that the qualified rate of finished products is increased, and the production cost is reduced.

The invention discloses a long wavelength photoinitiator containing carbazole derivatives, and relates to the field of photo-cured materials. The photoinitiator is synthesized by Claisen-Schmidt reactions. Aldehyde that participates in the reactions contains carbazole derivatives and does not contain alpha-H. Due to the carbazole groups, the conjugate action of the molecular structure is enhanced,and thus the maximum absorption wavelength of the synthesis product is prolonged. The provided initiator can be well dissolved in most photo-polymerized monomers; the UV absorption peaks can be matched with corresponding LED lamps; under the irradiation of LED lamps, polymerization of multiple monomers is triggered, and the curing effect is good. The invention also discloses a preparation methodof the long wavelength photoinitiator. The preparation method is simple, and the preparation conditions are mild.

The invention provides a high-efficiency polymerizable photoinitiator suitable for color photoresist and a preparation method of the photoinitiator, the initiator takes hydrogen abstraction type photoinitiator benzophenone as a core, an acrylate group is introduced into one benzene ring, and a hydrogen donor group is introduced into the other benzene ring. On one hand, the acrylate group can improve the solubility of the photoinitiator and improve the compatibility with resin, monomers and the like, and on the other hand, the photoinitiator participates in polymerization in the photocuring process, so that the crosslinking density of the colored glue is improved, the hardness is improved, and micromolecular photoinitiator migration caused by post-baking high temperature or extreme conditions is reduced; the hydrogen-donating group can significantly improve the initiation efficiency of the photoinitiator and the polymerization speed of the system.