983 results about "Photo initiator" patented technology

A UV curing apparatus and method is provided for enhancing the distribution and application of UV light to UV photo initiators in a UV curable ink, coating or adhesive. The UV curing apparatus and method comprises UV LED assemblies in a first row with the UV LED assemblies spaced from adjacent UV LED assemblies. At least one second row of a plurality of UV LED assemblies are provided next to the first row but with the UV LED assemblies of the second row positioned adjacent the spaces between adjacent UV LED assemblies in the first row thereby to stagger the second row of UV LED assemblies from the UV LED assemblies in the first row. Desirably, the rows of staggered UV LED assemblies are mounted on a panel. UV curable products, articles or other objects containing UV photo initiators that are in or on a web can be conveyed or otherwise moved past the rows of UV LED assemblies for effective UV curing. This arrangement facilitates more uniformly application of UV light on the UV curable ink, coating and/or adhesives in the UV curable products, articles or other objects. The apparatus can include one or more of the following: rollers for moving the web, mechanisms for causing the panel to move in an orbital or reciprocal path, and an injection tube for injecting a non-oxygen gas in the area of UV light curing.

A curable jettable liquid for manufacturing a flexographic printing plate comprising at least one photo-initiator, at least one monofunctional monomer, at least 5 wt % of a polyfunctional monomer or oligomer and at least 5 wt % of a plasticizer both based on the total weight of the curable jettable liquid capable of realizing a layer after curing having an elongation at break of at least 5%, a storage modulus E′ smaller than 200 MPa at 30 Hz and a volumetric shrinkage smaller than 10%.

The invention discloses a heat-resistant UV visbreaking glue composition and a UV visbreaking protective film prepared with this composition. This composition is made from the following materials according to parts by weight: 1-25% of a polyfunctional oligomer or polyfunctional monomer or its composition, 30-50% of a solvent type high-temperature-resistant polyacrylate pressure-sensitive glue, 0.5-1.5% of a cross-linking agent, 0.3-1.5% of a photo-initiator, and 35-60% of a solvent. The heat-resistant UV visbreaking protective film comprises a base (10), a bottom coating layer (20) applied to the surface of the base (10), a UV visbreaking glue layer (30) applied to the bottom coating layer (20), and a release film (40). The heat-resistant UV visbreaking protective film prepared herein can resist a high temperature of 120 DEG C and has the advantages of high UV pre-illumination release force, low UV post-illumination release force and no glue residue.

Photo-curable compositions for artificial teeth and denture base and a method for manufacturing denture by a three-dimensional printing system are provided. The compositions include photo-curable organic compounds, surface modified nano-sized inorganic filler, photo-initiator, colorant, and stabilizer. The composition is in a viscous liquid state having 1500-5000 cps at ambient temperature and has a low viscosity of 50-500 cps at jetting temperature or dispensing temperature. The composition also has an excellent curing rate for three-dimensional printing. Using the compositions, denture having a distinctive denture base and a set of artificial teeth can be manufactured via an inkjet type or digital light process type three-dimensional printing according to Computer Aided Design (CAD) data.

A method for producing polymers with controlled molecular weight and desired end functionalities and the resulting polymers. The method comprises a) forming a microemulsion comprising monomer, water, and an effective amount of an effective surfactant, b) adding to the microemulsion an amount of a water-soluble photo-initiator system wherein the initiator system produces one type of monomer-soluble radical active centers and wherein the radical active centers contain desired end group functionalities for a polymer or oligomer, and c) illuminating the microemulsion to photoinitiate polymerization of the monomer wherein the illuminating is according to a temporal and spatial illumination scheme, and wherein the amount of the initiator system and the temporal illumination scheme are chosen to produce a desired molecular weight of the polymer or oligomer. The microemulsion can further comprise an effective amount of an effective co-surfactant. The method can be used to produce polymers and copolymers.

A thermosetting resin composition has particular applications in three dimensional (3-D) printing. The thermosetting resin composition exhibits high performance and is characterized by a high temperature two stage cure resin composition. The thermosetting resin composition comprises cyanate esters and other high temperature resins, photo curable monomers, photo initiator, metal catalyst or ionic liquid catalyst. The thermosetting resin composition cures at room temperature to form 3-D objects and upon further post cure these objects exhibit high temperature properties enabling use at temperatures exceeding 150C.

The invention discloses an amphiphilic ternary polymer brush and a nano capsule. The amphiphilic ternary polymer brush has the following general formula, wherein A is polymer main chain, B is lipophilic polymer side chain, C is photo-crosslinked polymer side chain, D is hydrophilic polymer side chain, and the side chains B, C and D are randomly grafted onto the main chain A; and the nano capsule is prepared through dispersing the amphiphilic ternary polymer brush into an oil-water two-phase system, and then performing light crosslinking reaction or reaction initiated by light. The amphiphilic ternary polymer brush solves the difficulty that the particle size of the capsule can not be adjusted and controlled effectively by using the conventional segmented copolymers, and the size of the prepared photo-crosslinked nano capsule is easily adjusted and controlled; the nano capsule prepared by the emulsion self-assembly method is simple in operation and easy to use in large-scale preparation; the prepared hollow nano capsule is large in casting quantity; the photo-crosslinked nano capsule provided by the invention is stable, and according to the light crosslinking method, nontoxicity and safety are reliazed, and the environmental protection is realized. The amphiphilic ternary polymer brush has the following general formula: A-g-(B-r-C-r-D).

The invention discloses liquid photosensitive imaging alkali developing electric resistance welding ink and production method. The ink comprises alkali solulbility photosensitive resin 30-50 %, heat-proof novolac epoxy 5-20 %, firming agent 0.3-1.2 %, firming accelerant 0.1-0.3 %, active diluent 5-15 %, solvent 5-15 %, photo-initiation agent 3-9 %, auxiliary agent 1-3 %, pigment 0.5-0.8 %, brasque 15-30 %; When it is produced, the alkali solulbility photosensitive resin is weighted by mass percent and dispersed evenly by dispersion machine, it is abraded to that fineness is smaller than 15 mum, the viscosity is adjusted by solvent to 50-80ps(25DEG C), the liquid photosensitive imaging alkali developing electric resistance welding ink in the invention is obtained. The operational charactisteric of the invention is simple, development is quick, and the ink also possesses characteristics that heat-proof quality is good; construction is convenient, adhesive force achieves first class; solidness is bigger than 4H.

Bio-Inks and methods of using compositions comprising the bio-Inks are disclosed. 3-D tissue repair and regeneration through precise and specific formation of biodegradable tissue scaffolds in a tissue site using the bio-inks are also provided. Specific methylacrylated gelatin hydrogels (MAC) and methacrylated chitosan (MACh) preparations formulated with sucrose, a silicate-containing component (such as laponite), and/or a cross-linking agent (such as a photo-initiator or chemical initiator), as well as powdered preparations of these, are also disclosed. Kits containing these preparations are provided for point-of-care tissue repair in vivo. Superior, more complete (up to 99.85% tissue regeneration within 4 weeks applied in situ), and rapid in situ tissue repair and bone formation are also demonstrated.

The invention provides chitosan-based double-network hydrogel. The hydrogel is of a double-network structure. A first network is chitosan graft hydrogel, and the chitosan graft hydrogel is formed by chitosan liquid, an initiator, a first single body and a cross-linking agent through grafting reaction. A second network is inserted inside the first network, and the second network is hydrogel which is formed by polymerization of a second single body, a cross-linking agent and a photo-initiator under the radiation of ultraviolet light and has high compression strength and tensile strength. Due to the introduction of chitosan, the biocompatibility of the hydrogel is improved. Thus, application of the double-network hydrogel in the fields such as biological medicine, the construction industry, the chemical industry and the mining industry is improved. The invention further provides a preparation method for preparing the chitosan-based double-network hydrogel. The method is simple in technology and enables industrialization to be easy.

The invention provides a reflection holographic thin membrane and a preparation method thereof. The reflection holography membrane comprises a basement membrane, a buffer layer which is coated at one side of the basement membrane, a photopolymer coating which is coated at the other side of the buffer layer and formed by the holographic polymer paints, and a protective membrane which is covered on the surface of the photopolymer; wherein, hologram images or the interference fringes of double discoloration pictures are recorded on the photopolymer coating; the photopolymer coating comprises film-forming agents, a nano-composite pre-polymer, a monomer, photo initiators, chain transfer agents and photo sensitizers; the nano-composite pre-polymer is a product which is prepared by alkenyl unsaturated monomer with an unsaturated group at the terminal position and nano-particles. The invention has high sensitivity, high reflection efficiency, high refractivity modulation value, long storage life and little influence of the environment on the hologram images; the recorded images are treated by photo-curing and heat-enhancement and can reach reflected images and double discoloration images with the reflection efficiency of more than 99.9 precent, so mass production is available.

The invention provides graphene oxide/chitosan grafted type double-network hydrogel. The graphene oxide/chitosan grafted type double-network hydrogel is of a double-network structure, wherein the first network is graphene oxide/chitosan grafted hydrogel which is formed by a graphene oxide solution, a chitosan solution, an initiator, a first monomer and a cross-linking agent through grafting reaction, the second network is inserted in the first network in a penetrating mode, and the second network is hydrogel which is formed by a second monomer, a cross-linking agent and a photo-initiator through polymerization under ultraviolet irradiation. The graphene oxide/chitosan grafted type double-network hydrogel has high compression strength and tensile strength. Due to the fact that the chitosan is introduced, biocompatibility of the hydrogel is improved, and then the double-network hydrogel can be better applied to the fields of biological medicine, construction industry, chemical industry, mining industry and the like. The invention further provides a preparation method for preparing the graphene oxide/chitosan grafted type double-network hydrogel. The method is simple in process, and industrialization can be easily achieved.

The invention relates to a grinding and polishing pad of consolidation abrasive with self-adjusting function and the preparation method, belonging to ultra-precision grinding and polishing machining technical field, which is characterized in that components of the abrasive layer (3)comprises 1-20% by wt of abrasive with granularity of 1-40 nanometer, 20-80% by wt of acrylic pre-polymer, 1-3% by wt of free radical photo initiator, 0-2% by wt of poly (dimethylsiloxane)/acrylic polymer, 0-20% by wt of adjustment additive with system cross-linking density performance, and 5-40% by wt of acrylic active diluent. The preparation process comprises (1)mixing stock fully and uniformly, (2)preparing rigid polymer matrix, (3)daubing uniformly by screen-printing, and (4)solidifying by ultraviolet cured machine. The invention is provided with stable grinding and polishing performance and self-adjustment performance. It is suitable for precision machining.

The invention relates to an anti-static release liner, comprising a base membrane and a functional layer, wherein the functional layer is prepared from the following components in parts by weight: 0.5-1 part of conducting polymer resin, 1-2 parts of hydrogen-containing silicon oil, 5-10 parts of vinyl organic silicon resin, 0.05-0.2 part of platinum complex catalyst and 0.05-0.2 part of photoinitiator. The anti-static release liner disclosed by the invention has stable characteristics, double curing, namely heat curing and photo curing, is adopted, curing is thorough, chemical and physical properties are stable, stripping resistance and anti-static capacity are stable, an adhesive force is good, and less silicon is transferred. The invention has the advantages of a simple process, high production efficiency, low cost and less waste in production.

The invention discloses flexible ultraviolet-curing ink-jet ink, which comprises the following components in percentage by weight: 10-20% of oligomer, 30-60% of mono-functional monomer, 10-30% of bi-functional monomer, 0-10% of tri-functional monomer, 1-5% of pigment, 0.5-3% of dispersant, 4-10% of photo-initiator, 0.1-1% of wetting agent, and 0.1-1% of polymerization inhibitor, wherein oligomer adopts polyester acrylic oligomer, and wetting agent adopts modified siloxane wetting agent. The flexible ultraviolet-curing ink-jet ink has green environmental protection characteristics, and can be cured instantly under UV (ultraviolet) radiation, and meets the high-speed printing requirement, and can be printed on both hard and soft materials, and has the characteristics of good adhesion and flexibility, and cracking resistance, thereby having wide adaptability and excellent development prospect.

The invention discloses a heat moulding plastic printing ink based on ultraviolet-infrared drying technique, which comprises the following parts: 100-300g prepolymer-ultraviolet solidified resin, 50-200g activated monomer, 20-200g optical initiator, 10-150g infrared solidified resin, 79-150g dye, 10-30% titanic acid ester coupling agent 401, defoamer, levelling agent and inhibitor.

The invention discloses a normal-temperature multiple curing organic-inorganic hybridized aqueous polyurethane woodware coating and a preparation method thereof. The coating mainly contains organic-inorganic hybridized aqueous nano polyurethane latex, a film-forming assistant, a defoaming and foam inhibitor, a flatting agent, a base material wetting agent, a stable dispersing agent, a thickening agent and an aqueous photo initiator, wherein the organic-inorganic hybridized aqueous nano polyurethane latex is prepared by firstly obtaining a polyurethane prepolymer by pre-polymerizing, and then adding an inorganic nano material in an organic-inorganic hybridization way by an in-situ polymerization technology, and finally grafting a photo-curing end-capping agent containing active functional groups and C-C double bonds. The normal-temperature multiple curing organic-inorganic hybridized aqueous polyurethane woodware coating is obtained by adding and dispersing pigment fillings and an assistant evenly in the organic-inorganic hybridized aqueous nano polyurethane latex. The invention not only solves the pollution problem of a solvent-type VOC (Volatile Organic Compound) coating, but also solves the problem of aqueous coatings which have the defects of poor toughness and poor performances in weather resistance, aging resistance, acid resistance, alkaline resistance and solvent resistance.

The invention relates to a ceramic composite for 3D printing and a preparation method thereof. The ceramic composite for 3D printing is characterized by comprising the following components according to parts by weight: 20-45 parts of acrylate monomer, 121-165 parts of ceramic powder, 10-20 parts of spiro-orthocarbonate expansive monomer, 2-14 parts of a dispersant, 1-3 parts of a photo-initiator, 0-3 parts of a photo-inhibitor, and 1-3 parts of an ultraviolet absorber. The ceramic composite for 3D printing is low in curing and contraction degree and short in curing time and therefore is applicable to investment casting.

The invention discloses a thermo-curable 3D printing photosensitive resin and a preparation method and an application thereof. The photosensitive resin includes, by weight, 50-70 parts of a prepolymer, 30-50 parts of a diluent, 1-5 parts of a photo-initiator and 0.5-5 parts of a thermal-initiator, wherein the decomposition temperature of the thermal-initiator is higher than or equal to 100 DEG C when the half-life period thereof is 1 h. After photo-curing 3D printing shaping, the 3D printing photosensitive resin can be subjected to curing by heating as a post-curing method with a stable constant temperature heating device, such as a drying box and the like, so that the 3D printing photosensitive resin develops application in a non-transparent sample, a sample having complex shape, an ultra-thick sample, a colored sample and the like, and enables the samples to have better mechanical performances.

Provide is a method for forming an inkjet image in which a high-resolution image can be formed by a stable ink ejection and an inkjet image exhibits excellent curability, wherein the inkjet image is formed by ejecting an ink composition onto a medium from a nozzle of an inkjet recording head comprising a plurality of pressure chambers, a plurality of nozzles in communication with the pressure chambers and an ink chamber in communication with a side of a plurality of the pressure chamber on which side is opposite to a side of the nozzle of the pressure chamber, and the ink chamber is filled with the ink composition, wherein the ink composition comprises an photo-initiator, a polymerizable compound and a gelling agent; and comprising steps of heat-keeping a temperature of the ink composition in the ink chamber at 70° C.-140° C. during an image recording including during standing-by, and flowing the ink composition in the ink chamber.

A radiation curable coating composition for an optical fiber comprising: at least one urethane(meth)acrylate oligomer, at least one reactive diluent monomer and at least one photo initiator is described and claimed. The composition is capable of undergoing photopolymerization when coated on an optical fiber and when irradiated by a light emitting diode (LED) light, having a wavelength from about 100 nm to about 900 nm, to provide a cured coating on the optical fiber, with the cured coating having a top surface, and the cured coating having a Percent Reacted Acrylate Unsaturation (% RAU) at the top surface of about 60% or greater. Also described and claimed are the process to coat an optical fiber with the LED curable coating for optical fiber and a coated optical fiber where the coating has been cured by application of LED light.