36results about How to "Improve light curing efficiency" patented technology

The invention particularly provides a visible-light-quick-curing vinyl ester resin composite prepreg, and a preparation method and application method thereof, belonging to the field of repair of a fiber-reinforced resin-base structure with certain thickness. A special vinyl ester resin is used as a matrix; the proper visible light initiator, thermal initiator and other aids are selected to constitute the light-thermal composite initiation system; magnesium oxide is used as a thickener; different types of fabrics are selected as fiber-reinforcing materials according to performance requirements; and a proper composite technique is utilized to prepare the composite prepreg with certain thickness. The visible-light-curing prepreg material can be cured within 5 minutes under the single-side irradiation of visible light, and the once-time photocuring thickness can reach 10mm or above, thereby basically solving the problems of poor operability, poor safety and insufficient film thickness under ultraviolet light. The visible-light-curing prepreg can be subjected to mass application in the field of structure repair.

The invention discloses a method for preparing a natural polymer matrix light-cured resin. The method comprises the following steps: (1) leading polyisocyanate, oligomer polyol and hydroxyl-containing acrylate to react according to a certain molar ratio to prepare a semi-end-blocked prepolymer; (2) dispersing a natural polymer nano-material in a solvent, and adding the semi-end-blocked prepolymer prepared in the step 1 to obtain a full-end-blocked prepolymer; (3) mixing the full-end-blocked prepolymer and a photo-initiator to prepare the natural polymer matrix resin with excellent performance under ultraviolet radiation. The method adopts the natural polymer material as a raw material, and has the advantages that: the prepared light-cured resin has high molecular weight and viscosity, the interaction and coagulation strength among resin molecules can be enhanced, the photo-crosslinking reaction efficiency can be improved, the strength and attachment performance of a curing film can be improved, the cost is low, the process is simple and controllable, and the product is more environment-friendly.

The invention relates to the field of printing, and discloses a metal printing UV varnish and a coating method thereof. The UV varnish comprises the following components in percentage by mass: 30-60% of photocuring resin prepolymer, 30-60% of active monomer, 5-15% of photoinitiator and 0-15% of additive. The photocuring resin prepolymer is composed of at least one of a modified epoxy acrylic resin, a modified polyurethane acrylic resin and diallyl phthalate. The active monomer is composed of at least one of ethoxy acrylate, hexanediol diacrylate, acryloylmorpholine, trihydroxy acrylate, hydroxyethyl methacrylate and tripropylene glycol diacrylate. The UV varnish has the advantages of favorable leveling property, favorable gloss, favorable adhesive force and high photocuring efficiency. When being matched with the specific coating method disclosed by the invention, the UV varnish can not easily produce blisters, cratering, particles or other apparent defects.

The invention belongs to the technical field of coatings, and discloses a water-based one-coating UV-cured epoxy acrylate coating and a preparation method thereof. The coating comprises the followingcomponents in percentage by mass: 25%-50% of epoxy acrylic resin, 10%-20% of a hydrophilic active monomer, 0.1%-3% of a water-based photoinitiator, 1%-7% of water-based silver paste, 1%-3% of water-based color paste, 0.5%-2% of a water-based additive and the balance of water, totaling 100%. By adopting a specific catalyst and a polymerization inhibitor, a paint film can be quickly cured at one time, and the cross-linking curing of the paint film is more sufficient; and a specific hydrophilic functional monomer is adopted, so that the stability of the water-based paint is further improved.

The invention relates to the technical field of trenchless pipeline repair, in particular to an LED light curing device. Comprising a cylinder body, a plurality of long grooves are evenly formed in the outer edge of the cylinder body, rotating rods are rotationally arranged in the long grooves, a plurality of LED light curing lamps are evenly distributed and fixed to the end faces, facing the axis of the cylinder body, of the rotating rods, and a driving device used for driving the rotating rods to rotate is arranged on the cylinder body on the left sides of the long grooves; movable sleeves are slidably arranged in the barrel on the left side and the right side of the inner plate, transverse telescopic cylinders are fixed to the left side and the right side of the inner plate, the sealing plate is fixedly connected with telescopic rods of the telescopic cylinders, a plurality of movable rods are arranged between the sealing plate and the movable sleeves, and a plurality of LED light curing lamps are evenly distributed and fixed to the sides, facing the inner edge of the barrel, of the movable rods. The LED light curing device is simple in structure and convenient to operate, the overall length of the curing device can be reduced, meanwhile, an LED light curing lamp is effectively protected, and the LED light curing lamp is prevented from being damaged in the process of mounting or dismounting the curing device.

The invention discloses a preparation process and application of photosensitive resin for 3D printing. The process comprises the following steps of: 1) weighing organic silicon resin powder, an organic solvent and a silane coupling agent in parts by weight and adding the components into a first container to be stirred and mixed in a forward and reverse rotation alternating mode, the silane coupling agent being prepared by weighing silane, alcohol, water and acetic acid in parts by weight and mixing the components; 2) adding a catalyst, mixing and stirring the components until a transparent anduniform first liquid is obtained, respectively weighing a complexing agent and metal alkoxide according to parts by weight, and adding the components into a second container, mixing and stirring themetal alkoxide and the complexing agent in a forward and reverse rotation alternating manner until a transparent and uniform second liquid is obtained; 2) adding the first liquid into a third container, pre-stirring the first liquid, adding a second liquid, mixing and stirring the first liquid and the second liquid, adding an active diluent, and mixing and stirring all the components; 3) adding aphotoinitiator into the third container, and continuously stirring the mixture to obtain the 3D printing photosensitive resin.

The high-precision integrated circuit chip packaging device comprises an upper shell, a lower shell and a lining plate, a chip is fixed to the lining plate, the opposite sides of the upper shell and the lower shell are each provided with a second light guide frame, the inner side and the outer side of a frame body of each second light guide frame are each provided with a gluing groove, and the gluing grooves are formed in the inner side and the outer side of the frame body of each second light guide frame. The second light guide frame of the upper shell is provided with four folding blocks, the four folding blocks are evenly distributed at equal angles, the top ends of the folding blocks extend to penetrate through the upper shell and are fixedly provided with a first light guide frame, and the second light guide frame of the lower shell is provided with folding grooves matched with the folding blocks. And the packaging structure can be completely disassembled after being packaged, is convenient to maintain and reuse, is simple in process, effectively reduces the manufacturing cost, has market prospects and is suitable for popularization.

The invention discloses a naphthalimide aromatic sulfide photoinitiator for UV-LED photocuring and relates to the field of light-sensing polymers. The photoinitiator herein is provided based on the problem that an existing photoinitiator has poor initiating property under irradiation of an UV-LED light source and has a chemical structural formula shown in the description, wherein R1 is selected from C1-C16 aliphatic hydrocarbon group, aralkyl or phenyl; R2 is selected independently from hydrogen, alkyl, alkoxy, acyl, halogen atom, and nitryl. The invention also provides a preparation method ofthe photoinitiator herein and application of the photoinitiator in a photocuring system. The photoinitiator herein and its preparation method and application have the advantages that ultraviolet absorption wavelength of the photoinitiator prepared herein is evidently extended, the photoinitiator has high photocuring efficiency under the action of a UV-LED light source, and the photoinitiator is helpful for the development of UV-LED photocuring industry.

The invention provides an anti-fogging polyurethane acrylate resin and a preparation method thereof. The preparation method comprises the following steps of: reacting polyisocyanate with hydroxyl-terminated acrylate, and then reacting with hydroxyl-terminated quaternary ammonium salt to obtain the anti-fogging polyurethane acrylate resin. The raw materials are cheap and easy to obtain, and the manufacturing process is simple. The polyurethane acrylate resin has the characteristics of good anti-fog performance and rapid photocuring.

The invention relates to a phenazine derivative-series photoinitiator as well as a preparation method and application thereof. The phenazine derivative-series photoinitiator comprises a phenonaphthazine group and a 2-methyl-2-morpholinyl-acetonyl group connected to the benzene ring of the phenonaphthazine group. Compared with a photoinitiator 907, the absorption wavelength of the phenazine derivative-series photoinitiator undergoes red shift, so the phenazine derivative-series photoinitiator has higher matching degree with the emission wavelength of a UV-LED, and light absorption efficiency is obviously improved; and the phenonaphthazine group in the phenazine derivative-series photoinitiator is an electron-rich group, and interacts with the 2-methyl-2-morpholinyl-acetonyl group to make the phenazine derivative-series photoinitiator have high curing efficiency, and a migration rate in the use process is obviously reduced, so the application range of the phenazine derivative-series photoinitiator is obviously broadened.

A light reflection single-box UV curing machine comprises a rack. A conveying bin is arranged at the position, close to the top end, of the rack. A feeding opening and a discharging opening are formed in the left side and the right side of the conveying bin. A plurality of conveying shafts are arranged in the conveying bin in the horizontal direction side by side at intervals. The conveying shafts are sleeved with wear-resisting sleeves. UV lamps are arranged between the adjacent conveying shafts. UV boxes are arranged at the positions, right opposite to the upper portions of the UV lamps, of the top end of the conveying bin. Each UV lamp comprises a mounting support, a lampshade arranged on the support in a covering manner, a vertical UV lamp tube arranged in the center of the support and a hemispherical reflector arranged below the UV lamp tube. The height of the UV lamp tubes and the height of the hemispherical reflectors are smaller than the horizontal height of the conveying shafts. The structure of the UV lamps is improved, the incident angles and the arrangement positions of the UV lamps are changed, and therefore the light curing efficiency is greatly improved, and the problems that UV ink (gloss ink) surface layer aging, closing, embrittlement and the like happen, meanwhile, the adhesive force of ink (gloss ink) is poor, and the overprint interlayer binding force is poor are effectively solved.