33results about How to "Improve photoinitiation efficiency" patented technology

The invention relates to a self-crosslinking water-based photocurable polyurethane and its preparation method and application. The polyurethane is mainly obtained by reacting components including polyols and isocyanates, and the polyols include unsaturated polyols containing tertiary amino groups and carbon-carbon double bonds, polyols containing photosensitive groups, polypolyols and carboxyl-containing polyols. alcohol. The polyurethane contains carbon-carbon double bonds and photosensitive groups at the same time, and can be spontaneously polymerized and cross-linked and cured under ultraviolet light irradiation without adding a photoinitiator. The structural design of the polyurethane of the present invention is relatively flexible, and the overall chemical structure and the composition of each unit can be adjusted according to requirements, so as to obtain a polyurethane coating film with excellent performance.

The invention discloses a free radical photoinitiator containing a single vinyl ether group or a single propenyl ether group, and a preparation method thereof. The method comprises the following steps of: firstly adding diisocyanate, hydroxyl single vinyl ether or hydroxyl single propenyl ether into a reaction container and performing an ammonia esterification reaction; after reacting, adding a small-molecular free radical photoinitiator containing hydroxyl radicals, a solvent, a polymerization inhibitor and a catalyst into the reaction container and continuously performing the ammonia esterification reaction; and removing the solvent after reacting, thereby obtaining the free radical photoinitiator product containing the single vinyl ether group or the single propenyl ether group. Based on the vinyl ether group or the propenyl ether group, the free radical photoinitiator can be used for overcoming the defect of other polymerizable photoinitiators which are easy to polymerize automatically and poor in photostability, and has the good storage stability. When the free radical photoinitiator is used for a free radical photo-curing system, the free radical photoinitiator also has the advantages of low mobility and high stability. The free radical photoinitiator which is reliable and safe can be applied to UV (ultraviolet)-cured adhesives, coating materials and printing inks. Thus, the free radical photoinitiator has the great significance for the application and the popularization of photo-curing products in food packaging and medicine packaging.

The invention relates to a compound type odor-less light initiator and an ultraviolet curing coating material. The compound type odor-less light initiator is prepared from the following components in percentage by weight: 30 to 70 percent of zinc oxide and 30 to 70 percent of macromolecular light initiator, wherein the macromolecular light initiator is prepared from a hydroxy-containing light initiator, isocyanate and hydroxy-containing acrylic acid. The compound type odor-less light initiator disclosed by the invention is capable of effectively solving a smell problem generated by volatile organic small molecules released after photolysis of an organic light initiator, the initiation efficiency is high, and the conversion rate of the ultraviolet curing coating material can be increased, so that the smell and volatile organic matters released by residual unreacted raw materials in the ultraviolet curing coating material can be further reduced, and a paint film after photopolymerization is odor-less and is good in performance.

The invention relates to polycyclic amine modified (branched) polyether acrylate and a preparation method and application thereof. The polycyclic amine modified (branched) polyether acrylate is prepared by taking heteropolycyclic amine with diphenyl ketone and polycyclic tertiary amide structure as a modifier for Michael addition reaction and introducing the polycyclic tertiary amide structure into part of double bonds of (branched) polyether acrylate. The polycyclic amine modified (branched) polyether acrylate is low in viscosity and curing shrinkage rate and high in curing speed, overcomes the defect that conventional active amine is large in smell, prone to amide migration and yellowing and is a photocuring material having great prospect.

The invention discloses a method for preparing polymer Michler's ketone photoinitiators, which is shown in the following formula. The method comprises the following steps: synthesizing Michler's ketone containing two methyl tertiary amines by using 4,4'-difluorobenzophenone and piperazine as raw materials, dissolving the resulting Michler's ketone and a diepoxy monomer in an organic solvent, and allowing polymerization reaction for several hours under heating to produce the polymer Michler's ketone photoinitiator. The photoinitiator contains both Michler's ketone and amine co-initiator in themain chain and exhibits excellent photoinitiation property. Compared with the micromolecular photoinitiators, the polymer photoinitiator has the advantages of low mobility and toxicity and is widely used in painting, microelectronics and optical fields.

The invention belongs to aromatic ketone compounds, specifically relating to an aromatic ketone coumpound photoinitiator for ultraviolet light radiation solidification and method of manufacturing the same. The method consists of the following two typical steps: a first step of coverting the organic carboxyl acid coumpound into the corresponding acyl chloride intermediate under the action of thionyl chloride, and then the intermediate, without a separation and purifying process, directly performing Friedman-Crafts acylation reaction with biphenyl or disubstituted benzene compounds under the action of the equivalent or catalytic amount of Lewis acid type promotor to couple and obtain aromatic ketone coumpounds; a second step of performing soda treatment to a hydroxy-substituted aromatic ketone raw material to obtain its ion salt, the salt reacts with halogenated hydrocarbon, acyl chloride or other electrophilic reagents to obtain aromatic ketone compounds.

The invention discloses a thioxanthone dicarboamide compound and a preparing method and application thereof. The structural formula of the thioxanthone dicarboamide compound is shown in the specification. The thioxanthone dicarboamide compound is used as a UV-LED photoinitiator for photopolymerization of a vinyl unsaturated resin system, and can be applied to the photocuring field, the photopolymerization field and the photocrosslinking field.

The invention discloses an assisted initiator amine-containing polymerizable thioxanthone carbazole visible light photoinitiator and a preparation method thereof. The preparation method comprises that a compound containing polymerizable and epoxy groups is added into an amine compound, the mixture undergoes a reaction, the amine is removed so that alcohol containing polymerizable and assisted initiator amine groups is obtained, the alcohol or the alcohol and pyridine are added into chloroform, a mixture of PBr3 and chloroform is dropwisely added into the mixture, the mixture undergoes a reaction, the reaction product is treated to form a bromo-compound containing polymerizable and assisted initiator amine groups, thioxanthone carbazole and alkali are added into N, N-dimethyl formamide (DMF), the mixture is stirred to form a uniform mixture, the bromo-compound, cupferron and the N, N-dimethyl formamide mixture are dropwisely added into the reaction system, the reaction system undergoes a reaction, and the reaction product is treated to form a product. The visible light photoinitiator avoids yellowing and toxicity caused by the micromolecule assisted initiator, reduces oxygen inhibition influences and improves a curing rate and cured film stability.

The invention relates to the field of packaging materials, and specifically provides a packaging glue and a preparation method thereof, a packaging body and a preparation method thereof. The encapsulant is mainly prepared from the following raw materials in parts by mass: 40-60 parts of difunctional acrylate, 10-30 parts of trifunctional acrylate, 10-50 parts of acrylate prepolymer, ultraviolet photoinitiator 1‑15 parts and photosensitizer 1‑8 parts. The packaging adhesive has the advantages of high curing efficiency, fast curing speed, environmental protection and low cost, and does not require high temperature during curing, and will not quench the quantum dots.

The invention discloses a macromolecular photoinitiator containing diphenyl ketone groups and a preparation method of the macromolecular photoinitiator. The general structural formula of the macromolecular photoinitiator containing the diphenyl ketone groups is shown in the formula (I), wherein R1 refers to a methyl group or hydrogen; R2 refers to an alkyl group, hydrogen, an ethoxyl group or a hydroxypropyl group; R3 refers to an alkyl group, hydrogen or an ethoxyl group; R4-8 and R'4-7are separately selected from hydrogen or an alkyl group; R9 refers to a methyl group or hydrogen. The designed and synthesized macromolecular photoinitiator is obtained through copolymerization of a synthesized special polymerizable photoinitiator. According to the adopted polymerizable photoinitiator, two diphenyl ketone units contained in each molecule are fixed on two sides of a rigid triazine ring and are not contacted with each other, so that the probability of combination of adjacent free radicals is greatly decreased, and the photoinitiation efficiency is improved; meanwhile, the polymerizable photoinitiator contains amido hydrogen supply units, and accordingly, comonomers containing hydrogen supply components such as tertiary amine and the like are not required to be added additionally during preparation of the macromolecular photoinitiator.

The present invention relates to coating field, more specifically, the present invention relates to a kind of UV coating and preparation method thereof, by weight, the preparation raw material of described coating comprises 45-60 parts of N-alkylmaleimide modified Urethane acrylate, 10-35 parts acrylate monomer, 0.05-1 part initiator. The dosage of UV paint initiator described in this application is low, and the odor is low, reaching the A in the French VOC label + standard.

The invention belongs to the technical field of photocurable materials, and in particular relates to a preparation method and application of modified titanium dioxide as a photoinitiator. The invention first converts the Ti-OH bond structure on the surface of the titanium dioxide particle into a Ti-F bond structure , and then transform the Ti-F bond structure on the surface of the titanium dioxide particles into a titanium-carboxylate structure, thereby preparing the modified titanium dioxide. The prepared modified titanium dioxide has significant activity of photoinitiating the polymerization and crosslinking of acrylate monomers or / and resins, and can be used as a photoinitiator in the photocuring fields of white photocurable coatings and inks.

The invention relates to a visible light initiation system, especially to a preparation method for a high-efficiency biocompatible radical photopolymerization visible light initiation system, belonging to the technical field of photocuring preparation of medical hydrogels. The visible light initiation system is added into a photocured hydrogel precursor solution for preparation of a photocured hydrogel. On the basis that the total weight of the photocured hydrogel precursor solution is 100%, the system comprises, by weight, 0.5 to 1% of the first component--a photosensitizer, 0.5 to 1% of a second component--a coinitiator which is water-soluble sericin or silk peptide having undergone oxidation treatment by hydrogen peroxide, and / or 0.5 to 1% of a third component--a photosensitive synergist which is one selected from a group consisting of an iodonium salt, a sulfonium salt and a phosphonium salt.

The invention provides a bis-oxime ester photoinitiator, a preparation method, a photosensitive resin composition and an application. The bis-oxime ester photoinitiator has a structure represented by general formula (I). Since the above-mentioned bis-oxime ester photoinitiator contains a polymerizable group, it can form a polymer cured product with a relatively large molecular weight through a polymerization reaction during application, thereby effectively reducing the mobility induced by light. At the same time, due to the particularity of its structure, it has a relatively high initiation efficiency. Therefore, the bis-oxime ester photoinitiator with the above structure has the advantages of being difficult to migrate and having high photoinitiation efficiency.

The invention relates to a photopolymerization initiating system, in particular to a free radical photopolymerization initiating system based on amino acid derivatives and a method for initiating free radical photopolymerization, belonging to the technical field of free radical polymerization. A free radical photopolymerization initiating system based on amino acid derivatives, based on the total weight of the water-soluble photopolymerization system as 100%, the free radical photopolymerization initiating system includes the following components in weight percentage: the first component: photosensitive agent, 0.01-1%; the second component: co-initiator, 0.25-1.25%, and the co-initiator is a nitrogen-terminal non-phenyl substituted carboxy-terminal blocked glycine derivative. The co-initiator of the present invention is a glycine derivative with non-phenyl-substituted carboxy-terminal closure at the nitrogen end, which is a colorless compound without chromophoric groups; the photoinitiating system has high tolerance to environmental alkali; The photoinitiation efficiency is excellent.