591 results about "Photo crosslinking" patented technology

The present invention provides a non-radical photo-crosslinked hydrogel preparation method, comprising the following steps: a component A is dissolved in a biocompatible medium to obtain a solution A, component B-hydrazide, hydroxylamine or primary amine high molecular derivative is dissolved in a biocompatible medium to obtain a solution B; the solution A and the solution B are evenly mixed to obtain a hydrogel precursor solution; under illumination, aldehyde group produced by light excitation of o-nitrobenzyl in the component A of the hydrogel precursor solution is crosslinked with hydrazone, hydroxylamine or primary amine group in the component B in the form of respective formation of oxime and Schiff base to produce the hydrogel. The present invention also provides a kit for the hydrogel preparation, and application of the hydrogel in tissue repair, beauty and as a cell, protein or drug carrier. The tissue surface light-situ gel can be achieved by the hydrogel, in particular, wound surface in-situ thin glue formation can be achieved, and the hydrogel is especially suitable for clinical wound surface tissue repair and isolation.

A photo-crosslinkable polyolefin composition comprises a polyolefin, a source of functionality receptive to crosslinking by UV radiation, a cationic photoinitiator and optionally includes a free-radical photoinitiator, a crosslinking accelerator or sensitizer, and other additives such as compatibilizers, inorganic fillers, nanofillers, glass, polymeric and ceramic microspheres, glass fibres, flame retardants, antioxidants, stabilizers, processing aids, foaming agents and pigments. A method for manufacturing a UV-crosslinked polyolefin article comprises forming an article by extruding, moulding or otherwise forming the UV-crosslinkable polyolefin composition and subjecting the article to UV radiation on-line with the extrusion, moulding or other forming operation.

The invention discloses an insulating and sheathing material of ultraviolet light crosslinking expanding type phosphorus nitrogen flaming resistance polyolefine cables and a preparation method thereof. The invention is characterized in that polyethylene / PEMA and / or ethylene vinyl acetate or maleic anhydride grafted ethylene vinyl acetate or acid amide grafted ethylene vinyl acetate copolymer are taken as base, added with expanding type phosphorus nitrogen halogen-free flame retardants, light trigger, polyfunctional group cross linker and chemical inhibitor and matched with flaming retardant synergistic agent, antismoke agent and processing aid, and then squeezed out and pelleted into photo-crosslinking flame retardant cable materials; and then the flame retardant cable materials are melted and extruded on a cable conductor wire core and clad into an insulating layer and a sheathing layer; hereupon the ultraviolet light irradiation crosslinking is carried on the insulating layer or the sheathing layer. Via detecting, the oxygen index of the insulating layer or the sheathing layer is larger than 30%, the vertical flaming experiment passes through UL-94 V0 level, the tensile strength is larger than 12Mpa, the elongation at break is larger than 350%, and the electric volume resistivity is larger than 8*10 omega.cm.

A hydrogel layer is applied to a substrate advantageously when the layer is formed in situ, using a polymeric or copolymeric precursor that includes, respectively, monomer subunits that have a photocrosslinkable functionality and monomer subunits that have a chemically selective functionality for binding a biomolecular analyte, such as a protein. A hydrogel-coated substrate thus obtained is particularly useful as a probe for mass spectroscopic analysis, including SELDI analysis. Hydrogel particles also can be used for SELDI analysis.

The invention relates to an ultraviolet light cross-linked polymer material used for 3D printing, and a preparation method and an application thereof. Raw materials of the material comprise, by weight, 100 parts of polymer resin, 0.5-5 parts of an ultraviolet light cross-linking agent, 0.1-0.5 parts of an antioxidant, 1-20 parts of powder, 1-10 parts of a pigment and 0-20 parts of other assistant. The light cross-linking agent absorbs ultraviolet lights with specific wavelengths under ultraviolet light irradiation to generate high molecular chain free radicals, so a series of a rapid polymerization reaction is generated to the polymer resin crosslink in a 3D printing process in order to form a three-dimensional net structure. The heat resistance, the chemical corrosion resistance and the mechanical strength of the cross-linked polymer material are greatly improved, so the polymer resin has a wide application prospect in 3D printing materials.

The invention provides an ultraviolet light crosslinking low-smoke zero-halogen flame-retardant cable material. The cable material comprises polyolefin, a compatilizer, an inorganic flame retardant, an organic phosphorus-nitrogen-containing flame retardant, a flame-retardant synergist, a photoinitiator, an assistant crosslinker, a surfactant, an antioxidant and a lubricant, wherein polyolefin contains low-density polyethylene, an ethylene-octylene copolymer and an ethylene-vinyl acetate copolymer in the weight proportion being (10-25):(20-35):(55-65); the compatilizer is polyethylene for grafting of maleic anhydride; the inorganic flame retardant is selected from magnesium hydroxide and aluminum hydroxide; the organic phosphorus-nitrogen-containing flame retardant contains polyphosphoric acid, pentaerythritol and melamine in the weight proportion being (10-20): (4-8): (15-30); the flame-retardant synergist contains zinc borate and / or polydimethylsiloxane. The cable material has good thermal resistance and anti-aging performance, can be used at the temperature of 125 DEG C for a long time and is excellent in comprehensive mechanical performance and better in flame retardance.

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 relates to an ultraviolet crosslinking and curing EVA (ethylene vinyl acetate copolymer) optical adhesive film and a preparation method thereof. The ultraviolet crosslinking and curing EVA optical adhesive film takes EVA or a mixture of the EVA and an EVA-modified graft polymer as a base material; in the mixture, the weight ratio of the EVA to the EVA-modified graft polymer is 1: 0-0.2; and according to 100 parts of the of the base material by total weight, the EVA optical adhesive film further comprises the following raw materials in part by weight: 0.1-5 parts of photoinitiator, 0.1-5 parts of multifunctional crosslinking agent, 0.1-1 part of antioxidant, 0.1-1 part of light stabilizer, 0.1-2 parts of coupling agent and 0.1-10 parts of bonding resin. The preparation method is short in operating time, small in required equipment investment, simple in process, convenient in operation and maintenance, energy-saving, environment-friendly and high in production efficiency; the production cost is reduced; the ultraviolet crosslinking and curing EVA optical adhesive film is low in defective ratio and excellent in mechanical properties; and during use, the ultraviolet crosslinking and curing EVA optical adhesive film can be crosslinked and adhered through radiation of specific ultraviolet, so that optical adhesive OCA and liquid optical adhesive LOCA for adhering a display in the traditional electronic industry can be replaced.

The present invention provides a liquid crystal aligning agent which provides a liquid crystal alignment film having surface anchoring force and pretilt angle development stability by an optical aligning method. The liquid crystal aligning agent comprises a polymer having a photo-crosslinkable structure a structure having at least one group selected from the group consisting of a fluorine-containing organic group, an alkyl group having 10 to 30 carbon atoms and alicyclic organic group having 10 to 30 carbon atoms and optionally, (C) a thermally crosslinkable structure.

The invention provides a photo-crosslinking material which is composed of a methacryliated material containing -OH and -NH2 groups. The photo-crosslinking material is prepared by the following method: 1) the material containing -OH and -NH2 groups is dissolved; and 2) a solution obtained and methacrylic anhydride react for at least 16 h. The invention also provides hydrogel formed by the photo-crosslinking material. The hydrogel is prepared by the following method: 1) a light initiator is dissolved in a transparent solution of the photo-crosslinking material when protected from light; and (2) a solution obtained is illuminated. The hydrogel can be used as a repairing material of wounded tissues.

The invention provides a preparation method and application of a nano-modified PTFE and polyester-based composite film for preventing fan blades from icing. The method includes the steps of PTFE film modification, lamination complexing and photo-crosslinked adhesive application. A modifier is prepared from antimony-doped tin oxide nano-crystals, nano-titanium dioxide, nano-silicon carbide, an organic fluorine waterproofing agent and pentaerythritol tri-(3-aziridinyl)-propionate; in lamination complexing, a bonding complexing agent is prepared from 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate, vinyl acetate, ethyl carbamate, alpha-linolenic acid, (2)ethoxylated bisphenol A dimethacrylate, trimethylolpropane triacrylate and benzoyl peroxide; a photo-crosslinked adhesive is prepared from a poly[butyl acrylate-glycidyl methacrylate-n-butoxy methacrylamide]copolymer, vinyl acetate, butyl acrylate, an acrylate derivative, a photoinitiator and dimethylformamide. The method and the composite film solve the non-adhesion problem that a PTFE film can not be pasted on the surfaces of fan blades with an adhesive directly.

The invention relates to a polyfunctional castor oil-based photo-cured resin as well as a preparation method and application thereof. The preparation method comprises the following steps: with isocyanate and hydroxyl acrylate as raw materials, adding a polymerization inhibitor and a catalyst, introducing nitrogen for protection, and reacting for a certain period of time, so as to obtain an intermediate isocyanate semi-blocked prepolymer; adding castor oil into the prepared isocyanate semi-blocked prepolymer, so as to obtain castor oil-based urethane acrylate resin; and mixing the castor oil-based urethane acrylate resin with a photoinitiator and a diluent, and carrying out ultraviolet light radiation, so as to obtain UV castor oil-based resin with excellent performance. The photo-cured resin synthesized by virtue of the preparation method has relatively high molecular weight and viscosity, so that the interaction among resin molecules is enhanced, and the photo-crosslinking reaction efficiency of the resin is improved; the photo-cured resin contains more terminal double bonds, can be rapidly photo-cured and is suitable for being used as UV cured coatings, 3D printing materials and the like; and the prepared photo-cured resin has the beneficial effects that the water absorption rate and volume shrinkage rate of a cured film are substantially increased, meanwhile, the cost is low, the process is simple and controllable, and a product is relatively environment-friendly.

Disclosed is a curable composition which can be cured quickly by light. This curable composition is not left uncured even in portions which are not irradiated with light. A cured product of this curable composition is excellent in heat resistance, oil resistance and weather resistance. Specifically disclosed is a curable composition characterized by containing a vinyl polymer having at least one crosslinkable silyl group on average and a vinyl polymer having at least one photocrosslinkable group on average.

Poly(propylene fumarate) is copolymerized with poly(caprolactone) diol to produce a block copolymer of poly(propylene fumarate) and poly(ε-caprolactone). The biocompatible and bioresorbable block copolymer of poly(propylene fumarate) and poly(ε-caprolactone) is useful in the fabrication of injectable and in-situ hardening scaffolds for tissue and / or skeletal reconstruction. The block copolymer can be crosslinked by redox or photo-initiation, with or without an additional crosslinker. Thus, the copolymer is both self-crosslinkable (without the use of any crosslinkers) and photocrosslinkable (in the presence of UV light).

There is provided an underlayer coating that is used as an underlayer of photoresists in lithography process of the manufacture of semiconductor devices and that has a high dry etching rate in comparison to the photoresists depending on the type of etching gas, does not intermix with the photoresists, and is capable of flattening the surface of a semiconductor substrate having holes of a high aspect ratio; and an underlayer coating forming composition for forming the underlayer coating.The underlayer coating forming composition for forming by light irradiation an underlayer coating used as an underlayer of a photoresist in a lithography process of the manufacture of semiconductor devices, comprises a polymerizable compound containing 5 to 45% by mass of silicon atom (A), a photopolymerization initiator (B), and a solvent (C).

The invention discloses gelatin / carboxymethyl chitosan / POSS (polyhedral oligomeric silsesquioxane) photo-crosslinking hydrogel and a preparation method. Main components of the hydrogel consist of modified gelatin, modified carboxymethyl chitosan and octavinyl oligomerization silsesquioxane. The preparation method comprises the following steps: executing the double bond modification for the gelatin and the carboxymethyl chitosan by utilizing methacrylic acid glycidyl ester; mixing the modified gelatin, the modified carboxymethyl chitosan, the octavinyl oligomerization silsesquioxane, the cross-linking PEGDMA and the photo initiator 12959 to a solution, and photo-crosslinking the mixture to prepare the hydrogel. The gelatin / carboxymethyl chitosan / POSS photo-crosslinking hydrogel has the advantages that the preparation process is fast and simple, and the prepared hydrogel has biological compatibility; meanwhile, octavinyl oligomerization silsesquioxan is introduced into the system, so that the mechanical property of the gel can be remarkably improved, the biological and mechanical requirements of the repaired tissue can be simultaneously met, and the hydrogel has good application prospect on the aspect for restoring bones and basibranchial bones.

The invention relates to photo-crosslinking sericin protein hydrogel and a preparation method and application thereof. The preparation method comprises the steps that methyl propenyl modified sericin protein is prepared into a solution to be mixed with a photoinitiator (Irgacure 2959) solution, and the sericin protein hydrogel is obtained through ultraviolet irradiation. The obtained sericin protein hydrogel has the good biodegradability, autofluorescence characteristic and injectable property, and wounds caused by implanting or taking out biomaterials can be effectively reduced. Most importantly, the sericin protein hydrogel has good biocompatibility both in vivo and in vitro, and adhesion of carried cells can be effectively promoted. Serving as 2D and 3D cytoskeleton, the sericin protein hydrogel can effectively promote proliferation of the carried cells and promote the carried cells to form functional tissue under the condition of being free of serum support; serving as wound accessories, the sericin protein hydrogel can repair skin wounds and can serve as tissue engineering and regenerative medicine biological materials.

The invention provides new light absorbing crosslinking compositions suitable for use as an antireflective composition, particularly for deep UV applications. The antireflective compositions of the invention comprise a photoacid generator that is activated during exposure of an overcoated photoresist. Antireflective compositions of the invention can significantly reduce undesired footing of an overcoated resist relief image.

The invention discloses photo-crosslinked recombinant collagen hydrogel, a preparation method and application of the photo-crosslinked recombinant collagen hydrogel in 3D biological printing. The preparation method comprises the following steps: adding methacrylic anhydride into a phosphate solution of recombinant collagen, fully stirring and reacting to obtain methacrylic anhydride modified recombinant collagen, dissolving the modified recombinant collagen into a culture medium, adding a photoinitiator, uniformly mixing, then carrying out photoreaction, crosslinking and curing to obtain the photo-crosslinked recombinant collagen hydrogel. A recombinant collagen hydrogel precursor solution is placed in a mold or serves as 3D printing ink, and subjected to photoreaction, crosslinking and curing to prepare a tissue engineering scaffold or a 3D printing finished product; and cells can be added into the hydrogel precursor solution to prepare a tissue engineering scaffold or a 3D printing finished product loaded with the cells. The disclosed hydrogel is good in physical and chemical properties, good in biocompatibility, stable in quality and good in formability, can be prepared into anysize and shape, and is suitable for large-scale industrial production.

The invention discloses viromembrane protein with site-specific mutagenesis and site-specific decoration, a preparation method and applications of the viromembrane protein. Amber codon TAG is introduced to the specific site of envelope protein G (VSV G) gene of vesicular stomatitis virus, unnatural amino acid DiZPK with photo-crosslinking property is introduced to the specific site of VSV G by utilizing the orthorhombic aminoacyl-tRNA synthetase-tRNA through site-specific mutagenesis. In the interaction process of virus and host cells, the DiZPK photo-crosslinking reaction is triggered by 365nm ultraviolet light, the covalent bond is formed between the VSV G and interacting protein, the interaction dissociation can be avoided, and the powerful measure is provided for the research of the interaction of the virus and protein of the host cells.

The invention discloses an MOFs (metal-organic frameworks)-cross-linked polyethylene glycol diacrylate mixed substrate membrane, a preparation and an application. PEGDA (polyethylene glycol diacrylate) is selected as substrate membrane materials, MOFs are selected as fillers, and the MOFs-cross-linked polyethylene glycol diacrylate mixed substrate membrane is prepared by ultraviolet crosslinking and curing under induction of photo-initiators. The mixed substrate membrane has remarkable performances (PCO2>160Barrer, alpha CO2 / N2>70, alpha CO2 / CH4>40) for separating mixed gas of CO2 / N2 and CO2 / CH4. Compared with a pure cross-linked polyethylene glycol diacrylate membrane, the MOFs-cross-linked polyethylene glycol diacrylate mixed substrate membrane has higher CO2 gas permeability and separation selectivity, and can be applied to purification of flue gas and natural gas.

The invention relates to a monocomponent ultraviolet light self-crosslinking type acrylate copolymer coating, and a synthetic method and application thereof. The coating comprises, by weight, 0.02 to 8 of ultraviolet light active monomers, 2 to 20 of photocrosslinking functional monomers, 15 to 40 of other monofunctional monomers, 0.04 to 0.8 of an initiator and 30 to 80 of a solvent. The coatingis prepared by stirring the above-mentioned raw materials in a reaction vessel for a reflux reaction at a temperature of 75 to 90 DEG C for 5 to 8 hours so as to evenly mix the raw materials and cooling an obtained mixture. The coating is applied on a substrate of a product to be coated, and the substrate is put in an ultraviolet light curing apparatus for crosslinking by illumination after the solvent is completely volatilized. Compared to the prior art, the coating provided in the invention has the advantages of good temperature tolerance, no inclusion of micromolecular compounds, no generation of toxic byproducts, capability to adapt to different application requirements, stable performance, etc.

The invention provides a fabrication process of a cross-linked polyolefin insulation power cable, and belongs to the technical field of power cable manufacturing. The technological process comprises the steps that cable conductor paying-off is performed; upward traction is performed; heating extrusion insulation is performed by a plastic extruding machine with an electromagnetic method; when a main body box of cross-linked equipment is irradiated by ultraviolet light, defined amount of a photo-crosslinking sensitizer is added into a polyolefin-based resin, the characteristic that the polyolefin material is in a transparent state during heating extrusion is used to focus the ultraviolet light irradiation and transmit into the material, the high-energy ultraviolet light triggers the photo-crosslinking sensitizer to form free radicals and further induces a polyolefin unit to generate macromolecular free radicals, and the cross-linked polyolefin material is formed through a bonding function between the free radicals; the cross-linked polyolefin material enters a water tank for sizing and cooling; checking out is performed by an electric discharge machine; downward traction is performed; and wire gathering and laying is performed. The process replaces the traditional silane cross-linked polyethylene insulation power cable, is energy-saving, shortens the production cycle of the cable, saves the production cost, and increases the market competitiveness.

A creping adhesive comprising a PAE composition comprising a reactive, light crosslinked polyamidoamine-epichlorohydrin polymer (PAE-type polymer) optionally in combination with a reactive modifier and the corresponding method for of creping cellulosic fiber webs with the adhesive.

The invention discloses GelMA-oxidized dextran double-network hydrogel and a preparation method thereof. The preparation method comprises: 1) preparing oxidized dextran: reacting a dextran solution with an oxidizing agent to obtain oxidized dextran, 2) preparing methacrylated gelatin: reacting a gelatin solution with methacrylic anhydride to obtain a methacrylated gelatin, and 3) preparing double-network hydrogel: mixing the oxidized dextran solution with the methacrylated gelatin solution, then mixing the mixture with a photoinitiator solution to obtain a mixed solution, then standing the mixture to form gel, and carrying out ultraviolet irradiation on the obtained gel to obtain the GelMA-oxidized dextran double-network hydrogel. The photo-crosslinking double-modified GelMA-oxidized dextran double-network hydrogel is stable in structure and good in mechanical property, the preparation raw materials are safe and environmentally friendly, the preparation method is simple, the reaction conditions are mild, and the wide application prospect is achieved.

Silicone coatings and moldings are produced from a photocrosslinkable silicone mixture which contains(A) a polyorganosiloxane containing at least two carbon-carbon multiple bonds,(B) an organosilicon compound containing at least two SiH functions, and(C) a cyclopentadienyl-platinum complex catalyst be activatable by light of 200 to 500 nm,wherein the mixture is heated to 40° C. to 250° C., and then irradiated with light of 200 to 500 nm wavelength.

Photocrosslinkable electrically conductive polymers and compositions including the polymers are provided. Also, electrically conductive layers or films formed from the compositions, preparation methods of these, and articles including the electrically conductive layers or films are provided. The electrically conductive polymers according to the present disclosure have photoreactive groups that can be crosslinked using like. The electrically conductive polymers can also be dissolved in aqueous solution. These photocrosslinkable and soluble properties allow the electrically conductive polymers to be used in wet processing to make films and / or to be made into a patterned conductive layer or film using a photomask.

There is provided an underlayer coating that is used as an underlayer of photoresists in lithography process of the manufacture of semiconductor devices and that has a high dry etching rate in comparison to the photoresists, does not intermix with the photoresists, and is capable of flattening the surface of a semiconductor substrate having holes of a high aspect ratio; and an underlayer coating forming composition for forming the underlayer coating.The underlayer coating forming composition for forming by light irradiation an underlayer coating used as an underlayer of a photoresist in a lithography process of the manufacture of semiconductor devices, comprises a polymerizable substance and a photopolymerization initiator.

A method for forming a conductor pattern comprising the steps of (a) forming a photo-crosslinkable resin layer on a substrate provided with a conductive layer on its surface, (b) treating the photo-crosslinkable resin layer with an alkali aqueous solution to render it thinner, (c) carrying out exposure for a circuit pattern, (d) developing and (e) etching, the steps included in this order, said alkali aqueous solution being an aqueous solution containing 5 to 20 mass % of an inorganic alkaline compound, or method for forming a conductor pattern comprising the steps of (a′) forming a photo-crosslinkable resin layer on a substrate provide with a conductive layer on its surface and inside a hole thereof, (i) curing the photo-crosslinkable resin layer on the hole alone or on the hole and a surrounding area thereof, (b′) treating the photo-crosslinkable resin layer in an uncured portion with an alkali aqueous solution to render it thinner, (c) carrying out exposure for a circuit pattern, (d) developing and (e) etching, these steps included in this order, said alkali aqueous solution being an aqueous solution containing 5 to 20 mass % of an inorganic alkaline compound.