1037 results about "Polyurethane adhesive" patented technology

The invention relates to the technical field of non-woven fabrics, in particular to a production process of a functional fiber woven non-woven fabric body, the non-woven fabric body comprises a non-woven fabric base body, middle layers are arranged on the upper portion and the lower portion of the non-woven fabric base body, and outer layer bodies are arranged on the outer sides of the middle layers; the middle layer is compounded with the upper part and the lower part of the non-woven fabric base body through polyurethane glue, and the dosage of the polyurethane glue is 20g / m < 2 >; the non-woven fabric body is formed by mutually matching a non-woven fabric base body, a middle layer and an outer layer body, the non-woven fabric base body is formed by weaving first modified spandex fibers and polyester fibers, the middle layer is formed by interweaving second modified polyester fibers and hemp fibers, and the outer layer body is formed by spraying an outer layer agent. The product is excellent in wear resistance, stain resistance, heat preservation and breaking strength, remarkable in comprehensive coordination effect and excellent in washing resistance and ultraviolet stability resistance.

The invention relates to the technical field of polyurethane adhesives, and provides a heat-conducting polyurethane structural adhesive and a preparation and use method thereof.The heat-conducting polyurethane structural adhesive comprises a first component and a second component, and the first component comprises modified bio-based polyol, polythiol, heat-conducting filler, a first water removal agent, a thixotropic agent, a first catalyst and a second catalyst; the second component comprises epoxy resin, diisocyanate, polyisocyanate, a heat-conducting filler, a coupling agent, a second dewatering agent, a dispersing agent and a retarder; the modified bio-based polyol is selected from at least one of modified castor oil polyol, modified grease polyol and modified cashew nut shell oil polyol; the polythiol is selected from at least one of trimethylolpropane tri (3-mercaptopropionic acid ester), pentaerythritol tetra (3-mercaptopropionic acid ester), butanediol mercaptopropionic acid ester and polythiol. Through the arrangement, the heat-conducting polyurethane structural adhesive has relatively long openable time, and is rapidly cured at room temperature within a short time to generate relatively high initial curing strength.

The invention relates to the technical field of organic polymer adhesives, and particularly discloses a modified castor oil-based polyurethane adhesive as well as a preparation method and application thereof. The adhesive comprises two components, and the component A comprises the following components in parts by weight: 30.0-50.0 parts of modified castor oil and 0.0-30.0 parts of refined castor oil; the component B is prepared from the following components in parts by weight: 30.0 to 50.0 parts of polyisocyanate or a polyisocyanate modifier and 0.00 to 0.05 part of a dewatering agent; the modified castor oil is prepared from refined castor oil and cysteamine through a sulfydryl-alkene addition reaction. Amido of the modified castor oil is alkalescent, and the reaction speed of the modified castor oil and isocyanate groups is high; hydrogen bonds are easily generated between urea bonds generated by the reaction of amino groups and isocyanate groups, so that the adhesive is endowed with thixotropy and high strength. The adhesive disclosed by the invention is simple in composition, high in reaction speed and good in thixotropy and bonding strength.

The invention relates to a light / heat / magnetic detachable high-strength polyurethane adhesive as well as a preparation method and application thereof. The light / heat / magnetic detachable high-strength polyurethane adhesive comprises a polyurethane adhesive and a functional filler. According to the light / heat / magnetic detachable high-strength polyurethane adhesive prepared by the preparation method disclosed by the invention, the colloid is black, and the adhesive has excellent light absorption performance and can realize rapid separation of an adhesive interface under infrared irradiation through a heat effect; meanwhile, the ferroferric oxide can be vibrated and heated under the action of an external magnetic field due to the magnetic response characteristic of the ferroferric oxide, so that fracture and separation of the adhesive layer are promoted. By means of the technology, efficient and reversible disassembly of parts bonded through the hot melt adhesive is achieved, possibility is provided for recycling and reusing of bonding materials and devices, and the problem that traditional polyurethane hot melt adhesive cannot be recycled is solved.

The invention relates to the technical field of polyurethane adhesives, in particular to the field of IPC C09J175, and more particularly relates to a small molecule chain extender, a preparation method thereof and red polyurethane adhesive. The small molecule chain extender is prepared from the following raw materials: dichloroanthraquinone and ethanolamine, and the red polyurethane adhesive is prepared from the small molecule chain extender, polyol, isocyanate and a solvent. A red colored group is introduced into a polyurethane molecular chain, and the colored group is used as a part of a chain extender, so that the color migration resistance and the transparency are improved at the same time.

The invention relates to the technical field of design and processing of PVC (polyvinyl chloride) composite materials, in particular to a multi-layer composite processing method of a PVC decorative film based on heat resistance, which comprises the following steps: firstly, preparing PVC resin powder, various additives and a nano modified additive, premixing and mainly mixing the raw materials, uniformly mixing under the protection of nitrogen, plasticizing and extruding by using a double-screw extruder, and carrying out extrusion molding to obtain the PVC decorative film based on heat resistance. Surface treatment including plasma and chemical etching is carried out after extrusion, then a modified polyurethane bonding layer containing a silane coupling agent is coated and compounded with a micro-nano structure PET decorative film, ultrasonic vibration is applied, then hot-pressing shaping is carried out, a hot-pressing roller is provided with micro textures, finally cooling and rolling are carried out, and all the steps have specific parameters. According to the method, the effect is remarkable, the heat resistance of the PVC decorative film is greatly improved, the heat deformation temperature is increased, the processing performance is optimized, the production efficiency is improved, the bonding and compounding effect is enhanced, the decorative layer is not prone to falling off, the environmental protection property and the product attractiveness are further improved, and the market competitiveness is enhanced.

The invention discloses a bamboo longitudinal and wood transverse composite whole container bottom plate and a preparation method thereof, and belongs to the field of bamboo-wood composite materials. The bottom plate is of a seven-layer alternate paving structure and is formed by compositing transverse wood veneer layers and longitudinal radial bamboo curtain layers, wood veneers are made of lignin modified polyurethane adhesive (reinforced by nano-silicon dioxide), and bamboo curtains are made of bamboo fiber nano-crystal reinforced soybean protein adhesive (cross-linked by genipin). Through continuous paving, fixed-length saw cutting and a'cold-in-cold-out 'hot pressing process (the pressure is 1.5-8.0 MPa, and the temperature is 140-220 DEG C), whole-piece production of any length is achieved. According to the technology, the bamboo-wood interface bonding problem is solved, the bending strength reaches 120 MPa, the interlayer shear strength is 7.8 MPa, the strength retention rate after damp-heat aging resistance is 90%, the formaldehyde emission is smaller than or equal to 0.05 mg / m < 3 >, the bio-based carbon content is 85%, high strength, weather resistance and environment friendliness are achieved, a traditional spliced container bottom plate can be replaced, the material utilization rate is increased by 20% or above, and the manufacturing cost is remarkably reduced.

The invention relates to the technical field of sound absorption materials, in particular to an aerogel and cork composite sound absorption material with a dual-scale pore structure and a preparation method. The preparation method of the aerogel-softwood composite sound absorption material with the double-scale pore structure comprises the following steps that softwood particles subjected to microwave treatment are placed in a SiO2 aerogel precursor solution to be subjected to vacuum impregnation treatment, then hydrolysis and condensation polymerization are conducted, a three-dimensional network structure is formed through crosslinking, freeze drying is conducted after water soaking, and the aerogel-softwood composite sound absorption material with the double-scale pore structure is obtained. SiO2 aerogel and cork composite particles are obtained; and spraying a polyurethane adhesive into the SiO2 aerogel and cork composite particles, and then carrying out hot press molding to obtain the aerogel and cork composite sound absorption material with the dual-scale pore structure. According to the preparation method, microwave treatment and dipping treatment are combined, so that the sound absorption performance of the prepared aerogel and cork composite sound absorption material with the double-scale pore structure is improved, and the problem that sound absorption is not facilitated due to the unique cell structure of cork is solved.

The invention discloses a sizing agent and a preparation method thereof and belongs to the technical field of carbon fibers. The preparation method comprises the following steps: dissolving 1 part of polyethylene glycol in an organic solvent according to a molar ratio, adding 0.9-1.1 parts of a first isocyanate compound, stirring, heating to 40-50 DEG C, and reacting; the preparation method comprises the following steps: respectively adding 0.3-0.5 part of second epoxy resin and a first diisocyanate compound, stirring, heating to 80-90 DEG C for reaction, then respectively adding 0.4-0.6 part of an acrylate compound and a third isocyanate compound for reaction, finally adding 0.8-1.2 parts of an allyl polyethylene glycol end-capping reagent, cooling to 40-50 DEG C, and stirring for 1-2 hours, so as to obtain the polyurethane adhesive. And removing the organic solvent to obtain the modified polyurethane main agent. The modified polyurethane main agent, the first epoxy resin and water are emulsified to obtain the sizing agent with good stability, adhesive force and bundling property, so that the wear resistance and bonding strength of the carbon fiber composite material can be improved.

The invention relates to the technical field of mine filling materials, and discloses a high-strength filling material for a mine and a preparation method, the high-strength filling material for the mine comprises 23.5-30 parts by weight of water, 50-64 parts by weight of chlorine-containing tailings, 5-16 parts by weight of pre-excited gelling slurry, and 2.5-6 parts by weight of a polyurethane cementing agent emulsion. The polyhydroxy sulfonic acid grinding aid prepared by the invention contains a plurality of hydroxyl groups and sulfonic acid groups, has stronger acting force with the surface of the slag and greater infiltration effect, and can be strongly adsorbed in microcracks on the surface of the slag after ball milling, so that the surface energy of slag particles is reduced, the dispersity of the slag particles is improved, and the specific surface area is increased; the activity of the slag powder can be stimulated to a greater extent, and the compressive strength of the filling material can be improved.

The invention relates to the technical field of fire extinguishing microcapsules, in particular to a high-airtightness perfluorohexanone fire extinguishing microcapsule and a preparation method and application thereof.The perfluorohexanone fire extinguishing microcapsule comprises a composite shell layer and a fire extinguishing core, and the composite shell layer is made of ethylene-vinyl alcohol copolymer resin and silicon dioxide nanoparticles; the fire extinguishing core is a perfluorohexanone fire extinguishing agent and is applied to preparation of indoor fire extinguishing pastes, fireproof coatings and polyurethane adhesive materials. According to the perfluorohexanone fire extinguishing microcapsule disclosed by the invention, the diffusion of low-polarity perfluorohexanone is effectively prevented by utilizing the strong hydrogen-bond interaction between hydroxyl groups in the ethylene-vinyl alcohol copolymer resin, and especially under the condition of relatively high temperature, the perfluorohexanone fire extinguishing microcapsule has a good fire extinguishing effect. The problem that an existing perfluorohexanone fire extinguishing microcapsule is poor in long-term air tightness under the condition of high encapsulation efficiency is effectively solved, and meanwhile harmful substances such as formaldehyde cannot be generated.

The invention discloses polyurethane glue with heat conduction and insulation characteristics for a self-adhesive label and a preparation method of the polyurethane glue, raw materials of the glue comprise a polyurethane prepolymer, an organic silicon modifier, nano montmorillonite and the like, and a glue layer has a structure in which a heat conduction compact phase and an insulation porous phase are combined with each other. The organic silicon modifier endows hydrophobicity, and the nano-montmorillonite hinders moisture permeation, reinforces the fiber to support a cellular structure and improves mechanical properties. The preparation method comprises the following steps: preparing a polyurethane prepolymer, modifying organic silicon, dispersing nano montmorillonite and the like, and synergistically improving various properties of the glue by controlling the conditions of each step and the ratio of raw materials. The glue disclosed by the invention is excellent in moisture-proof, heat-conducting, insulating and mechanical properties, can meet the use requirements of the self-adhesive label in a complex environment, and solves the problems that the existing glue is single in performance and cannot meet high-end application scenes.

The invention discloses a forming method of a high-bending-strength composite insulator winding pipe, which comprises the following steps: firstly, an inner layer structure of the insulator winding pipe is prepared by a pultrusion process, the inner layer structure is cylindrical, the outer diameter of the inner layer structure is matched with the inner diameter of the winding pipe, and a plurality of uniformly distributed cambered surface bulges are formed on the surface of the inner layer structure; a reinforced interface layer is formed on the outer wall of the inner layer structure, is formed by aramid fiber preform fabric, and is treated by a modified epoxy glue solution by adopting a three-dimensional orthogonal weaving process; the interface layer is tightly attached to the inner layer structure, epoxy / polyurethane glue liquid is coated outside the interface layer, and a semi-finished winding pipe product is formed; the winding pipe semi-finished product is subjected to pre-curing treatment, a small number of uncured groups are reserved, external packaging is conducted through an injection molding method, a winding pipe blank with an outer layer structure is obtained, and the outer diameter of the winding pipe blank is matched with that of the finished product; and demolding the winding pipe blank, fettling and carrying out quality inspection to obtain a finished product of the high-bending-strength composite insulator winding pipe. The method can remarkably improve the mechanical strength and durability of the winding pipe, and has wide application prospects.

The invention relates to a preparation method of a damp-proof antibacterial medicine packaging composite material with multiple barrier functions, and belongs to the technical field of medicine packaging materials. Enabling the composite complexing nano-silver, polyethylene and zinc stearate to pass through a double-screw extruder to obtain nano-silver antibacterial master batches; adding the nano-silver antibacterial master batch, a mixture of linear polyethylene and an ethylene-vinyl alcohol copolymer, an antioxidant 1010 and silicon dioxide into a single-screw extruder to obtain a damp-proof antibacterial film layer; uniformly coating a polyurethane adhesive on the surface of the damp-proof and antibacterial film layer, compounding an aluminum foil and the film layer coated with the adhesive on a compounding machine, and curing to obtain an aluminum foil-damp-proof and antibacterial film layer; the surface of the aluminum foil-damp-proof antibacterial film layer is coated with a polyurethane adhesive, and then the aluminum foil-damp-proof antibacterial film layer is compounded with a biaxially oriented polypropylene film and cured. The packaging composite material prepared by the invention has excellent moisture resistance, antibacterial ability, barrier property and mechanical property.

The invention provides a waterproof antibacterial two-component polyurethane adhesive and a preparation process thereof, and belongs to the technical field of polyurethane adhesives. The waterproof antibacterial two-component polyurethane adhesive comprises a component A and a component B, the component A is prepared from the following raw materials in parts by mass: 60 to 70 parts of modified hexamethylene diisocyanate prepolymer and 30 to 40 parts of solvent; the component B comprises the following raw materials in parts by weight: 50-60 parts of polyester polyol, 5-10 parts of a chain extender, 8-12 parts of zinc oxide nanoparticles, 0.1-0.5 part of a catalyst and 2-5 parts of ionized water; the modified hexamethylene diisocyanate prepolymer is hexamethylene diisocyanate grafted carboxylated bis (2-hydroxyethyl) terephthalate. The waterproof antibacterial two-component polyurethane adhesive has excellent waterproof performance and antibacterial performance, is particularly suitable for being used in a humid environment, and still can keep high cohesiveness.

The invention discloses a waterborne polyurethane adhesive and a preparation method thereof, and belongs to the technical field of high polymer materials. The waterborne polyurethane adhesive provided by the invention comprises a main agent and a curing agent, and most of raw materials of the main agent and the curing agent are waterborne materials, such as a waterborne polyurethane dispersion, a waterborne acrylic emulsion, a waterborne EVA emulsion, a waterborne rosin resin emulsion, a waterborne terpene resin emulsion and waterborne isocyanate. Due to the water-based materials, the adhesive has the characteristics of low VOC (volatile organic compounds), zero formaldehyde and low odor. Moreover, the water-based isocyanate in the curing agent and the active hydroxyl in the main agent component can be subjected to addition polymerization reaction to form a cross-linked network polymer, so that the adhesive has relatively high cohesiveness and can meet the bonding requirement of the automotive trim.

The invention relates to the technical field of polyurethane structural adhesives, in particular to a two-component polyurethane structural adhesive and a preparation method thereof. Comprising a component A and a component B. The component A comprises, by weight, 70-130 parts of polyether polyol, 1-5 parts of a chain extender, 5-10 parts of a flame retardant, 6-12 parts of a first dewatering agent, 3-5 parts of a thixotropic agent, 0.06-1 part of a catalyst and 110-200 parts of a modified heat-conducting filler. The component B is prepared from 70 to 130 parts of polyurethane prepolymer, 0.5 to 2 parts of second dewatering agent and 110 to 200 parts of modified heat-conducting filler; the technical problems that in the prior art, a polyurethane system adhesive is serious in cohesive strength attenuation under the working condition of 80 DEG C and low in high-temperature shear strength retention rate are solved by providing the double-component polyurethane structural adhesive.

The invention discloses a thermoplastic whole-core flame-retardant conveying belt and a preparation method thereof. The thermoplastic whole-core flame-retardant conveying belt is composed of a core layer, a flame-retardant covering layer, a wear-resistant layer and a bonding layer. The core layer adopts three layers of aramid fiber / polyester mixed fabric (the radial linear density is greater than or equal to 5000N / cm) and is impregnated with a halogen-free flame-retardant polyurethane sizing material (containing 15phr of APP and 10phr of zinc borate); the flame-retardant covering layer is an intumescent flame-retardant system formed by adding 5 phr of microencapsulated red phosphorus, 20 phr of magnesium hydroxide and 8 phr of melamine cyanurate into an EVA (Ethylene Vinyl Acetate)-based compound; the surface wear-resistant layer is made of ultra-high molecular weight polyethylene (Mw is larger than or equal to 3 * 10 < 6 >, and the thickness ranges from 0.8 The product has the advantages of high strength, light weight, flame retardance and high joint strength retention rate, and is suitable for heavy-load high-temperature scenes such as mines and metallurgy.

The invention relates to the technical field of adhesives, and provides a polyurethane adhesive and a preparation method and a use method thereof.The polyurethane adhesive comprises a first component and a second component, the first component is prepared from a polyurethane prepolymer, isocyanate, pigment filler and a thixotropic agent; the second component is prepared from the following raw materials: polyol, a water removal agent, a pigment filler, a first catalyst and a second catalyst; the polyurethane prepolymer is obtained through reaction of a low-activity isocyanate monomer and a chain extender, the low-activity isocyanate monomer is selected from at least one of isophorone diisocyanate, hexamethylene diisocyanate, dicyclohexylmethane diisocyanate and a hexamethylene diisocyanate tripolymer, and the chain extender is selected from at least one of isophorone diisocyanate, hexamethylene diisocyanate, dicyclohexylmethane diisocyanate and hexamethylene diisocyanate tripolymer. The first catalyst is selected from at least one of an organic tin catalyst and an organic bismuth catalyst, and the second catalyst is selected from at least one of amine catalysts.

This application relates to the field of polyurethane adhesive technology, and provides a thermally conductive polyurethane structural adhesive and its preparation and application methods. The thermally conductive polyurethane structural adhesive includes a first component and a second component. The first component includes a modified bio-based polyol, a polythiol, a thermally conductive filler, a first dehydrating agent, a thixotropic agent, a first catalyst, and a second catalyst. The second component includes an epoxy resin, a diisocyanate, a polyisocyanate, a thermally conductive filler, a coupling agent, a second dehydrating agent, a dispersant, and a retarder. The modified bio-based polyol is selected from at least one of modified castor oil polyol, modified oil polyol, and modified cashew nut shell oil polyol. The polythiol is selected from at least one of trimethylolpropane tris(3-mercaptopropionate), pentaerythritol tetra(3-mercaptopropionate), butanediol mercaptopropionate, and polythiol. This configuration allows the thermally conductive polyurethane structural adhesive to have a longer open time and to rapidly cure at room temperature in a short time, resulting in high initial strength.

The invention relates to the technical field of packaging materials, in particular to a preparation method of a food heat-preservation environment-friendly quick-transportation packaging bag. The prepared quick-transportation packaging bag sequentially comprises an outer film layer, a heat preservation layer, an aluminum foil layer and an inner film layer from outside to inside. The outer film layer and the inner film layer are made of a blend of polylactic acid, carboxymethyl starch and glycerol, the thermal insulation layer is formed by compounding a phase change capsule, silicon dioxide aerogel and a polyurethane adhesive on an aluminum foil layer, the phase change capsule takes a mixture of n-octadecane and paraffin as a core material and takes Arabic gum as a wall material, and the outer surface of the wall material is coated with a stearic acid film layer; an antibacterial coating containing microwave modified beewax, a functional additive and 3-aminopropyltriethoxysilane is sprayed on the inner surface of the inner film layer; the prepared quick-transportation packaging bag has excellent heat preservation performance and antibacterial performance, also has good degradability, is environmentally friendly and can meet multiple requirements of modern food logistics for packaging.

The invention relates to the technical field of polyurethane materials, in particular to a non-MOCA type fitness equipment rubber coating material and a preparation method thereof. The preparation method comprises the following steps: adding polytetrahydrofuran, isophorone diisocyanate, 1, 4-butanediol, a 2, 2-dimethylolpropionic acid solution, a hydroxyl chain extender, triethylamine, deionized water and a flame-retardant filler to obtain a polyurethane emulsion; and coating the polyurethane emulsion to form a film, and drying to obtain the polyurethane adhesive film. Adding the flame-retardant filler into ethanol, and ultrasonically dispersing uniformly to obtain dispersion liquid; spraying the dispersion liquid onto the surface of a polyurethane adhesive film to obtain a pretreated polyurethane adhesive film; and carrying out layer-by-layer self-assembly on the surface of the pretreated polyurethane adhesive film for 5-6 times to obtain a finished product. The finished product prepared by the invention has excellent flame retardant property, antibacterial property and mechanical property, thereby having wide application prospect in the technical field of polyurethane materials.

The invention relates to the technical field of adhesives, and discloses a nano-modified polyurethane adhesive, which comprises an isocyanate component, a polyol component, a nano modifier, a chain extender, a catalyst, a solvent, an antioxidant and an antifoaming agent, and is characterized in that the nano-modified polyurethane adhesive comprises the following components in parts by weight: 1-10 parts of a catalyst, 1-10 parts of a solvent, 1-10 parts of an antioxidant and 1-10 parts of a defoaming agent; the raw materials comprise 15-25 parts of an isocyanate component, 40-60 parts of a polyol component, 3-8 parts of a nano modifier, 2-5 parts of a chain extender, 0.1-0.5 part of a catalyst, 10-20 parts of a solvent, 0.2-0.8 part of an antioxidant and 0.1-0.3 part of a defoaming agent; the nano modifier is nano composite particles modified by a silane coupling agent, and the nano composite particles are formed by compounding nano silicon dioxide and nano montmorillonite according to the mass ratio of (2 to 1) to (3 to 1). According to the nano-modified polyurethane adhesive and the preparation method thereof, the nano-modified polyurethane adhesive has the advantages of being high in bonding strength, excellent in heat and humidity resistance, good in high and low temperature stability and uniform in nano particle dispersion, and the problems that a traditional polyurethane adhesive is poor in water resistance and insufficient in high and low temperature performance, and particles are agglomerated and the interfacial compatibility is poor during nano-modification are solved.

The invention belongs to the technical field of polyurethane adhesives, and particularly relates to a two-component polyurethane structural adhesive as well as a preparation method and application thereof. The bi-component polyurethane structural adhesive comprises a component A and a component B which are independently stored, the component A comprises polyester polyol, polyether polyol, castor oil polyol and optional first filler, first molecular sieve, first plasticizer and first aid; the component B comprises an isocyanate compound, an isocyanate double-terminated polyurethane prepolymer and optional second filler, a second molecular sieve, a second plasticizer and a second aid; the first filler and the second filler are independently selected from filler modified by a silane coupling agent. The key of the invention lies in that polyester polyol, polyether polyol and castor oil polyol with long carbon chain structures are introduced as polyol raw materials, and a specific filler modified by a silane coupling agent is introduced, so that the obtained bi-component polyurethane structural adhesive has excellent interfacial shear strength and T peel strength at the same time.

The invention provides an ultralow-temperature-resistant bio-based polyurea-polyurethane adhesive and a preparation method of the ultralow-temperature-resistant bio-based polyurea-polyurethane adhesive. The adhesive is prepared from the following raw materials in molar ratio: 0.5 of polyhydric alcohol; 1.0 part of isocyanate; 1.6 to 1.8 parts of hydrazide; and 0.6 to 0.8 part of vanillin dimer. The adhesive prepared by the invention has a very good bonding effect on 304 stainless steel, and can be used at an ultralow temperature. A polymer network contains rich polar groups such as carbamate and urea bonds, and the polar groups can form hydrogen bonds or other chemical bonds with substances such as oxides on the surface of metal, so that the adhesive has relatively high adhesive capacity on various base materials. According to the invention, the cheap and environment-friendly bio-based chain extender is used as a raw material, and a flexible polymer chain is used as a soft segment, so that the adhesive is endowed with the use performance at ultralow temperature while the high shear strength of the adhesive is ensured.

The invention relates to a formaldehyde-free environment-friendly polyurethane adhesive and a preparation method thereof, relates to the technical field of high polymer materials, and aims to solve the problems of formaldehyde residue, poor water resistance, high process energy consumption, high cost and the like of the existing formaldehyde-free adhesive. According to the invention, dimethylolpropionic acid and wood metal ions form coordinate bonds to strengthen interface bonding, trimethylolpropane constructs a three-dimensional hydrophobic network, and toluene diisocynate isomers are subjected to fractional reaction to optimize crosslinking uniformity. The content of free formaldehyde in the adhesive is not detected, the adhesive strength retention rate is greatly improved after the adhesive is boiled in boiling water for 72 hours, the hot pressing time is shortened to 8 minutes, and the raw material cost is reduced by 40% or above compared with similar products.

The invention provides a high-performance environment-friendly polyurethane adhesive and a preparation method thereof, and belongs to the technical field of adhesives. Wherein the high-performance environment-friendly polyurethane adhesive is prepared from the following raw materials in parts by mass: the component A is prepared from 60 to 80 parts of polyester type polyol dispersion, 1 to 2 parts of an emulsifier, 0.05 to 0.5 part of a de-foaming agent, 5 to 8 parts of zinc borate and 20 to 30 parts of de-ionized water; the component B comprises the following raw materials in parts by weight: 30-50 parts of a polyisocyanate curing agent, 3-8 parts of modified silicon dioxide, 0.1-0.2 part of a catalyst and 10-15 parts of ethyl acetate; the modified silicon dioxide is modified by an amino silane coupling agent. According to the high-performance environment-friendly polyurethane adhesive provided by the invention, the modified silicon dioxide is added into the component B, and the dispersity of the component B in a water phase is improved by utilizing the synergistic effect after the modified silicon dioxide is combined with the polyisocyanate, so that the structural defect of excessive or insufficient local crosslinking is reduced.

The invention discloses a UV photocuring adhesive, a preparation method thereof and an application of the UV photocuring adhesive in the electronic field, and relates to the field of adhesives. The preparation method comprises the following steps: when the UV photocuring adhesive is prepared, carrying out a reaction on dihydroxyl modified 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, p-phenylene diisocyanate, polyethylene glycol and 2-ethyl-4-methylimidazole, so as to obtain imidazole-terminated isocyanate, and carrying out a reaction on the imidazole-terminated isocyanate and the 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, so as to obtain the UV photocuring adhesive. The modified lignin, butanediamine and N, N '-methylene bisacrylamide are subjected to a reaction, and a double-bond reactant is prepared; the preparation method comprises the following steps: reacting epoxy-terminated siloxane with octamethylcyclotetrasiloxane, tetramethyltetravinyl cyclotetrasiloxane and tetramethylammonium hydroxide to obtain modified siloxane, and finally, uniformly mixing imidazole-terminated isocyanate, a double-bond reactant, modified polysiloxane and benzoin butyl ether to obtain the polyurethane adhesive. The UV light-cured adhesive prepared by the invention has good adhesive property, anti-aging property and flame retardant property.

The invention belongs to the field of adhesives, and relates to an acrylate-siloxane modified polyurethane adhesive as well as a preparation method and application thereof. The acrylate-siloxane modified polyurethane adhesive contains a silane modified polyurethane prepolymer, an acrylate compound, a photoinitiator and an optional rheology modifier, wherein the silane modified polyurethane prepolymer, the acrylate compound, the photoinitiator and the optional rheology modifier are used as raw materials; the silane modified polyurethane prepolymer is prepared by the following steps: firstly, carrying out addition polymerization reaction on a polyisocyanate compound and a low-viscosity polyol compound, and then carrying out addition reaction on the obtained polyurethane prepolymer and a silane coupling agent containing reactive hydrogen. The low-viscosity polyol compound has a glass transition temperature of 0 DEG C or less and a melting point of 40 DEG C or less; the functionality of at least a portion of the acrylate compound is bifunctional or less, and the glass transition temperature is 20 DEG C or more. The acrylate-siloxane modified polyurethane adhesive provided by the invention has the characteristics of low viscosity, no bubble and high curing speed.

The invention provides a preparation method of a self-repairing waterborne polyurethane leather coating material containing a polyurethane colloid capsule, which comprises the following steps: firstly, preparing an O / W type Pickering emulsion by taking modified SiO2 nanoparticles as a stabilizer and a polyurethane solution as an oil phase; the preparation method comprises the following steps: firstly, taking the polyurethane colloid capsule as a template, forming the colloid capsule capable of being dispersed in a water system through a sol-gel reaction, and finally, uniformly dispersing the colloid capsule into a waterborne polyurethane leather finishing emulsion to prepare the waterborne polyurethane leather self-repairing coating material containing the polyurethane colloid capsule. According to the invention, the polyurethane healing agent is used as a core material, and the modified SiO2 nanoparticles are used as a shell wall, so that the prepared spherical colloid capsule is high in encapsulation efficiency and strong in stability. According to the preparation method provided by the invention, the problems of poor self-repairing performance and mechanical property caused by low compatibility of a healing agent and a polyurethane matrix for leather finishing and easy agglomeration of a traditional microcapsule in a waterborne polyurethane emulsion in a traditional external aid type self-repairing polyurethane coating are solved; and the wear resistance of the leather polyurethane coating is remarkably improved by introducing SiO2.