573 results about "Photo crosslinking" patented technology

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.

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 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.

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).

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 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 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.

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.

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.

The invention relates to a method for preparing a faceted heater from an ultraviolet crosslinking macromolecular positive temperature coefficient (PTC) material through adopting a three-dimensional (3D) printing mode. The method comprises the following steps: a, stirring and mixing 100 parts of polyolefin and/or ethylene-propylene-diene-terpolymer rubber, 15-30 parts of carbon powder, 1-1.5 parts of an ultraviolet initiator and 1-1.5 parts of a crosslinking agent to form a mixed material; b, pouring the mixed material and 100 parts of tetrahydrofuran into an internal mixer to internally mix, and pulping the mixture in a three-roll mill after cooling so as to form a PTC size; c, preparing a PTC faceted heating body from the PTC size through 3D printing; d, irradiating the formed PTC faceted heating body through an ultraviolet light source to form a crosslinking PTC faceted heating body; and e, laminating the crosslinking PTC faceted heating body through laminating equipment to form the faceted heater. By utilizing the method, various 3D printing materials can be provided, and macromolecular PTC materials and devices thereof are simple in technology, energy-saving and environmental-friendly.

Disclosed herein are a gel polymer electrolyte, a method of manufacturing the same, and an electrochemical device including the same. According to the present invention, a gel polymer electrolyte including: a multi-component crosslinked polymer matrix; a dissociable salt; and an organic solvent, wherein a content of the multi-component crosslinked polymer matrix is 1 to 50 wt % and the multi-component crosslinked polymer matrix has a net structure formed by crosslinking at least three different kinds of crosslinkable monomers, each of the crosslinkable monomers including at least two functional groups selected from the group consisting of a carboxylic group, an acrylate group, and a cyano group, a method of manufacturing the same using a thermal crosslinking or photo-crosslinking process, and an electrochemical device including the same, may be provided.

The invention discloses a preparation method of photo-crosslinking polyvinyl alcohol/nanocrystalline cellulose PVA/CNC compound hydrogel and belongs to the macromolecular material field and the photosensitive material field. The preparation method includes: adding natural polymer CNC into a PVA solution to obtain a PVA/CNC mixed solution; adding N,N'-methylenebisacrylamide (MBA) containing a carbon-carbon double bond and an amino group into the mixed solution to allow the MBA to have hydrogen-bond interaction with the PVA and CNC, performing polymerization under the ultraviolet irradiation at the same time, and performing circulating freezing-unfreezing treatment to obtain the photo-crosslinking PVA/CNC compound hydrogel. The photo-crosslinking PVA/CNC compound hydrogel is capable of improving the mechanical property of PVA hydrogel and allows the PVA hydrogel to be well applied in various fields such as agriculture and gardening, biological medicine and environment protection.