17results about How to "Initiation efficiency is high" patented technology

The invention discloses a preparation method of tert-amyl peroxypivalate and an initiator, and belongs to the technical field of preparation of initiators. The preparation method comprises the following steps: by taking water as a solvent, when tert-amyl hydrogen peroxide and caustic soda liquid react to generate tert-amyl peroxide salt, the tert-amyl peroxide salt and pivaloyl chloride are subjected to substitution reaction to obtain the tert-amyl peroxide, and the substitution reaction speed of the pivaloyl chloride is higher than the hydrolysis speed of the pivaloyl chloride. Auxiliary materials are dispersed in an oil phase, shearing and emulsifying are carried out, the peroxide pivalate initiator is obtained, the auxiliary materials comprise an emulsifying agent, a dispersing agent, an anti-freezing agent and water, and the oil phase adopts the peroxide pivalate obtained through the method. The oil-phase raw material residue is low, and the storage stability time of the initiator emulsion prepared from the oil phase is longer than 30 months.

The invention relates to a preparation method of a maleic acid-acrylic acid copolymer, and belongs to the field of fine chemical engineering. The preparation method comprises the following steps: preparing a composite catalyst solution from copper sulfate pentahydrate and ferrous sulfate heptahydrate; a main initiator azo initiator aqueous solution and an auxiliary initiator hydrogen peroxide aqueous solution are adopted, and maleic acid and acrylic acid monomers are subjected to low-temperature polymerization to prepare a maleic acid-acrylic acid copolymer aqueous solution. The residue of maleic acid free monomer in the maleic acid-acrylic acid copolymer prepared by the method is not more than 30ppm, the platinum-cobalt chromaticity is not more than 100, and no three wastes are generated in the whole process. Meanwhile, the chelation dispersing performance of the maleic acid-acrylic acid copolymer is superior to that of similar products at home and abroad.

The invention relates to the technical field of seed priming, in particular to a seed priming device which comprises square hollow columns, the square hollow columns are divided into an upper group and a lower group, a plurality of connecting plates are fixedly connected between the two groups of square hollow columns, and a control cabinet is fixedly mounted on the connecting plate on the upper side. A plurality of clamping mechanisms are arranged at the top ends of the two sets of square hollow columns, limiting mechanisms are arranged on the multiple clamping mechanisms, and rolling mechanisms are arranged between the two sets of square hollow columns; the clamping mechanism comprises fixing frames fixedly connected to the top end of the square hollow column, and the inner wall of each fixing frame is slidably connected with a sliding block. An initiation barrel placed on the roller can be clamped and fixed, so that the rotating speed of the initiation barrel can be changed at will, the initiation barrel cannot be separated from the roller when the initiation barrel is in a high-rotating-speed state, the rotating stability is guaranteed, the initiation time can be shortened, and the initiation efficiency is improved.

The present invention provides a low migration UV light-curing digital printing label inkjet ink and a preparation method thereof, comprising the following components by mass: 3-5 parts of epoxy acrylate oligomer, 5-10 parts of polyurethane acrylate oligomer, 4-6 parts of trimethylolpropane triacrylate, 60-70 parts of 1,6-hexanediol diacrylate, 6-10 parts of isopropyl acrylamide, 10-18 parts of UV submicron color paste, 1-2 parts of modified silica, and 1-2 parts of polymerizable photoinitiator; wherein the modified silica is a product obtained by partially grafting organic acid with hydroxylated silica; the UV submicron color paste comprises a pigment, 1,6-hexanediol diacrylate and a dispersant. In the low migration UV light-curing digital printing label inkjet ink provided by the present invention, the compounding of multiple components effectively improves multiple properties of the ink, reduces the mobility of the ink, and overcomes the shortcomings and defects of the prior art.

The raw material compositions for preparing acrylic optical coatings and for preparing acrylic optical lenses both contain sulfur-containing aromatic acrylate compounds as shown in Formula A. The optical materials prepared from these raw material compositions, with precisely controlled refractive indices of 1.53–1.60, significantly improve the material's resistance to yellowing, optical durability, and impact resistance, meeting the application requirements of high-end optical materials. Wherein, R1 = CH2 = CH-COO, R2 = CH3, n = 2 or 3, and m = 0, 1, or 2.

The invention discloses a method for preparing polytetrahydrofuran-polyamino acid block copolymer by rare earth trifluoromethanesulfonate activation, wherein rare earth trifluoromethanesulfonate is used as an activator, polytetrahydrofuran containing terminal hydroxyl groups is used as an initiator, and ring-opening polymerization of α-amino acid-N-carboxylic anhydride is activated and initiated in an organic solvent to prepare polytetrahydrofuran-polyamino acid block copolymer. The method for preparing polytetrahydrofuran-polyamino acid block copolymer by rare earth trifluoromethanesulfonate activation disclosed by the invention directly prepares polytetrahydrofuran-polyamino acid block copolymer by a one-step method, and has high initiation efficiency and strong controllability; the prepared copolymer has adjustable molecular weight, variable composition, and narrow molecular weight distribution; in addition to preparing diblock copolymers and triblock copolymers, star-shaped block copolymers can also be prepared.

The application discloses a cycloalkane oxime ester photoinitiator and a preparation method and application thereof, and belongs to the field of chemical synthesis and photocuring technology. The photoinitiator has a structure as shown in the formula (I).

The invention belongs to the technical field of photoinitiators, and particularly relates to a photoinitiator and a preparation method and application thereof.The POSS is introduced into a thioxanthone system, an organic-inorganic hybrid structure of the POSS can form a synergistic effect with thioxanthone molecules, the light absorption range is widened, a compound can efficiently respond to ultraviolet light and even visible light, and the photoinitiator has the advantages of being high in light absorption efficiency, high in light absorption efficiency and high in light absorption efficiency. A nanoscale structure network formed by POSS can significantly reduce the migration rate of the photoinitiator, and the durability and safety of the material are further improved. Through intermolecular interaction with thioxanthone molecules, POSS can promote absorption of light energy and efficient generation of free radicals, so that the polymerization efficiency is remarkably improved. The composite photoinitiator not only provides a new thought for photoinitiator design, but also shows a wide application prospect in the fields of photocureable coatings, photosensitive materials, 3D printing and the like.

The invention provides a bis-carbazolyl sulfonium salt-containing compound as well as a preparation method and application thereof, and belongs to the technical field of photochemistry. The bis-carbazolyl sulfonium salt-containing compound provided by the invention has a structure as shown in a formula (I). According to the invention, the molecular volume is increased by introducing the dicarbazole group, and meanwhile, the compound has very excellent solubility and photosensitive activity, and can be used as a high-quality substitute of a resist acid generator and a photoinitiator for cationic polymerization.

The invention relates to the technical field of photoinitiators, in particular to a photoinitiator for UV-LED and preparation and application thereof.The preparation method comprises the following steps that TPO-L acyl chloride is added into methylbenzene, morpholine or piperidine is added and mixed, temperature is controlled, stirring is conducted, triethylamine is dropwise added while stirring is conducted, then heating reaction is conducted, and the photoinitiator for UV-LED is obtained; after the reaction is finished, sequentially washing with water, diluted hydrochloric acid and a saturated sodium bicarbonate aqueous solution, drying with a drying agent, and performing reduced pressure distillation to obtain a product. A tertiary amine group (morpholine or piperidine) is introduced into the structure of the prepared photoinitiator, so that the absorption wavelength range of the photoinitiator is effectively widened, and particularly, the photoinitiator shows excellent application performance under the wavelength of 405 nm of a UV-LED (Ultraviolet-Light Emitting Diode).

The invention discloses a thioxanthone modified photoinitiator intermediate and a preparation method thereof, and the molecular structure of the thioxanthone modified photoinitiator intermediate is shown as a formula A-6. The invention also discloses a water-soluble polymerizable photoinitiator prepared from the photoinitiator intermediate, the molecular structure of the water-soluble polymerizable photoinitiator is shown as a formula T, the molecular structure of the photoinitiator is specifically designed, so that the photoinitiator is remarkably improved in the aspects of spectral absorption, solubility and migration stability compared with the prior art, and high initiation efficiency, good water solubility and low migration of visible light are realized; the water-soluble polymerizable photoinitiator can be widely applied to water-based photocureable coatings, environment-friendly printing ink and other industrial applications with high requirements for safety and stability and has remarkable technical improvement and practical value, and the invention further discloses a preparation method of the water-soluble polymerizable photoinitiator.

The application discloses emulsified temperature-resistant salt-resistant polyacrylamide and a preparation method thereof. The polyacrylamide is prepared by using acrylamide, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid and N-dodecyl acrylamide as monomers, and using a composite initiator through aqueous solution polymerization to obtain a quaternary copolymer. The polymer has good emulsification, temperature resistance and salt resistance, and has a high viscosity retention rate under the conditions of a temperature of 50-75 DEG C and a salinity of 5000-35000 mg / L. The preparation process is simple and practical, and is beneficial to industrial production.

The invention relates to an ultraviolet-moisture dual deep curing organic silicon composition, which is prepared from the following raw materials in parts by mass: 100 parts of acrylate-terminated polysiloxane, 0 to 20 parts of inert diluent, 5 to 10 parts of reactive diluent, 5 to 10 parts of macromolecular photoinitiator, 0 to 10 parts of white carbon black, 1 to 5 parts of alkoxy crosslinking agent, 0.3 to 2 parts of coupling agent and 0.4 to 1 part of moisture curing catalyst. The structural formula of the macromolecular photoinitiator is # imgabs0 #, m is an integer, and m is more than or equal to 50 and less than or equal to 150. The macromolecular photoinitiator is matched with the matrix resin and the reactive diluent, so that the curing depth reaches 25 mm or above when UV irradiation is carried out for 60 s.

The invention relates to a (2, 4, 6-trimethylbenzoyl) (3, 4-xylene) phenyl phosphine oxide photoinitiator and a preparation method and application thereof, and the preparation method comprises the following steps: preparing (3, 4-xylene) phenyl phosphine chloride, preparing (3, 4-xylene) phenyl phosphine oxide, and preparing (2, 4, 6-trimethylbenzoyl) (3, 4-xylene) phenyl phosphine oxide. Compared with the prior art, the preparation method disclosed by the invention is a brand new photoinitiator compound, the product purity is up to 99%, the wastewater generation amount in the production process is greatly reduced, the performance test of the substance is superior to the product performance of the same series of acylphosphine oxide photoinitiators, and the raw materials required by the process are all bulk chemical raw materials, are stable in source, and are suitable for industrial production. The maximum absorption strength of XTPO is superior to that of the main product TPO at present, the curing efficiency of the initiator is higher, and the coloring stability is better.

The application discloses a self-hydrogen-supplying chalcone photoinitiator and application thereof in preparation of white photosensitive ink, wherein the structural general formula of the self-hydrogen-supplying chalcone photoinitiator is shown in the following formula: The self-hydrogen-supplying chalcone photoinitiator has strong absorption in the ultraviolet to visible light region, and has the characteristics of photobleaching and self-hydrogen supply. When the self-hydrogen-supplying chalcone photoinitiator is applied to preparation of the white photosensitive ink, a thick film with high reflectivity, no yellowing and excellent curing effect can be obtained. The photoinitiator has high initiation efficiency, small dosage, simple synthesis and is suitable for industrial production. The product can be used in LED and miniLED backlight structures with high reflectivity requirements.

The utility model discloses a photocuring adhesive reaction kettle which is characterized in that materials in the kettle are quickly and efficiently mixed in the radial direction and the longitudinal direction by combining a paddle type stirrer and a multi-layer frame type stirrer which are arranged in the kettle body, and the frame type stirrer can scrape and clean residual materials on the inner wall of the kettle in time; a plurality of light source panels are arranged at the top, the side face and the bottom of the kettle body, one or more light source panels can be flexibly selected, light sources can make contact with reaction materials in a closer distance, polymerization of monomers in the kettle is initiated, and the initiation efficiency is improved; the temperature in the kettle can be accurately controlled by introducing a medium through the stirring shaft; compared with the prior art, the problems that a conventional light source is only arranged at the top of the kettle body, the irradiation distance of the light source is long, the initiation effect is not obvious and the reaction time is long are solved, and a medium is introduced through the stirring shaft to take away polymerization reaction heat in time; the frame-type stirring is combined with a liquid guide device at the upper part of the kettle body to realize online cleaning of the kettle wall.

The invention belongs to the field of PVP (Polyvinyl Pyrrolidone) production, and relates to a preparation process of polyvinylpyrrolidone, which specifically comprises the following steps: S1, dissolving NVP in deionized water to obtain an NVP solution; s2, adding a composite catalyst composed of soluble cobalt salt and cerium salt and a composite initiator composed of a redox initiator and an azo initiator into the NVP solution, and carrying out a first polymerization reaction; the redox initiator comprises persulfate and sulfite. And S3, carrying out a second polymerization reaction to obtain a polyvinylpyrrolidone liquid. And S4, performing post-treatment to obtain polyvinylpyrrolidone powder. Under the combined action of the composite catalyst and the composite initiator, the polymerization reaction rate of the NVP monomer can be remarkably increased, the temperature and time of the polymerization reaction are reduced, monomer residues and side reactions are reduced, and white polyvinylpyrrolidone is prepared.