210 results about "Oxygen inhibition" patented technology

A flash curing system for solid freeform fabrication which generates a plurality of radiation emitting pulses that forms a planar flash. The planar flash initiates curing of a curable material dispensed by a solid freeform fabrication apparatus. The radiation emitting pulses have a high peak power value that releases a sufficient quantity of free radicals from the photoinitiator to initiate curing and overcome the problem of oxygen inhibition. Substantially less power is consumed and less heat generated by the flash curing system compared to conventional continuous emission curing systems.

The invention relates to an anti-ultraviolet transparent hard coating film for in-mold decoration (IMD), which is formed by coating a transparent hard coating on a transparent substrate. The transparent hard coating comprises the following components in part by weight: 20 to 40 parts of polyester acrylate oligomer, 10 to 30 parts of organic-inorganic hybrid oligomer, 0.5 to 5 parts of ultraviolet absorption precursor, 1.0 to 10 parts of hydrogen proton donor, 0.5 to 7 parts of photoinitiator, 0.5 to 7 parts of active amine, 0.05 to 2 parts of leveling agent and 30 to 70 parts of solvent, wherein the thickness of the hard coating is 2 to 6mu m. The anti-ultraviolet transparent hard coating film solves the problems of ageing, yellowing, embrittlement and the like of a product irradiated by ultraviolet rays, solves the problems of oxygen inhibition and hydrogen proton consumption and ensures the formation of an ultraviolet absorbent; and the film meets the requirements of the IMD on forming and stretching by combining raw materials and controlling the thickness of the hard coating, and the stretching and forming height of the film can be 7 to 8mm at most but the film cannot be embrittled.

The invention relates to the field of UV gloss oil, in particular to environment-friendly UV gloss oil for food packaging and printing. The environment-friendly UV gloss oil comprises, by weight, 8-45% of prepolymer, 8-65% of active monomer, 1-15% photoinitiator, 0.05-2% of defoamer, 0.05-2% of flatting agent, 5-10% of thickener, 5-35% of solvent and 5-10% of isophorone. Free radical photoinitiator and cationic photoinitiator are added at the same time; through oxygen inhibition resisting and post-curing effects of cations, photocuring effect is enhanced, migration of the photoinitiators is reduced, and the environment-friendly UV gloss oil has the advantages of high solution resistance, good glossiness, high hardness and environment friendliness.

The invention discloses a macromolecule photoinitiator for gradient polymerization as well as performance research thereof, which is characterized in that organosilicon-polymer is adopted to react with reactive micromolecule photoinitiator to prepare organosilicon macromolecule photoinitiator; the photoinitiator is applied to gradient polymerization to obtain a polymer with the molecular weight varying in a gradient way by a primary polymerization; and the gradient variation along vertical direction is uniform and has no obvious component interface. In addition, the initiator not only overcomes the defects of easy yellowing, evaporation and migration, great toxicity, poor thermal resistance and the like, but also is endowed with capability of spontaneous ascending by characteristics of organosilicon surface energy and low surface tensile force, thus effectively avoiding oxygen inhibition.

The invention discloses a copolymerized macromolecular photoinitiator, and relates to the technical field of synthesizing photoinitiators in the field of photopolymerization. and the photoinitiator has a structural formula shown in the specification. The present invention also provides a preparation method for preparing the above photoinitiator. The beneficial effect is that the prepared copolymerized macromolecular photoinitiator of the invention can be copolymerized with different comonomers to improve the oxygen inhibition problem, and can provide a hydrogen donor as a one-component multi-faceted photoinitiator.

The invention discloses an ultraviolet curing adhesive capable of being quickly cured at low energy and a preparation method of the ultraviolet curing adhesive. The adhesive is prepared from the following raw materials by weight: 30 to 60 percent of an acrylate oligomer, 20 to 50 percent of an active diluent, 2 to 5 percent of a photoinitiator, 1 to 4 percent of an adjuvant and 2 to 5 percent of a low-polyamine synergist. Compared with the prior art, the ultraviolet curing adhesive disclosed by the invention has the advantages that by optimal screening of the acrylate oligomer and the active diluent, particularly by adding of the low-polyamine synergist, the influence of oxygen inhibition is effectively avoided; furthermore, the crosslinking curing efficiency is improved, and the energy to be absorbed for curing of the ultraviolet curing adhesive is greatly reduced, so that the portion which cannot be irradiated by ultraviolet rays can be cured through low energy reflection light rays, and the application field of the ultraviolet curing adhesive is expanded; the energy required by complete curing of the adhesive is less than or equal to 30 mj / cm<2>; meanwhile, after being cured, the ultraviolet curing adhesive is high in strength, high in surface dryness, high in toughness, excellent in damp-heat resistance and high temperature resistance, and the like.

The invention provides a UV cured type pressure sensitive adhesive. The UV cured type pressure sensitive adhesive comprises the following components in parts by mass: 70-90 parts of monofunctional amine modified polyurethane acrylate resin, 0.1-2 parts of a cross-linking agent, 5-30 parts of tackifying resin and 2-10 parts of a photoinitiator. By the prepared pressure sensitive adhesive, the shortcoming that the surface of a cured film has micromolecules due to oxygen inhibition of the conventional UV type pressure sensitive adhesive is overcome; a tertiary amine structure is introduced in a molecular chain structure of resin, so that the monofunctional amine modified polyurethane acrylate resin is synthesized; by the tertiary amine structure, the problem of the oxygen inhibition in an acrylate double bond reaction process can be solved, the surface curing degree of the pressure sensitive adhesive is improved, and the shortcomings that by the conventional pressure sensitive adhesive, a large number of micromolecules remain on the surface of the cured film, and therefore, the peel strength is reduced are overcome.