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

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 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 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.