505 results about "Polyurethane coating" patented technology

The invention discloses a preparation method of an ethyl cellulose and isocyanate cross-linked coated urea slow-release fertilizer, and relates to a preparation method of a urea slow-release fertilizer. The invention aims to solve the problems that the existing nitrogen fertilizer is low in utilization rate and easy to absorb moisture and cake, a polyurethane coating material is non-degradable, and pure ethyl cellulose is insufficient in mechanical strength and limited in water resistance and is not beneficial to being used as a coating matrix of the fertilizer. The method comprises the following steps: 1, preparing an ethyl cellulose cross-linked isocyanate enveloping solution; and 2, preparing the ethyl cellulose and isocyanate cross-linked coated urea slow-release fertilizer. According to the preparation method, etherified derivative ethyl cellulose of cellulose is taken as a raw material, and the defects that a pure ethyl cellulose membrane is insufficient in mechanical strength, limited in water resistance and low in nutrient separation control precision are overcome by utilizing isocyanate crosslinking modification. The prepared slow-release fertilizer has the advantages of being simple in process, low in cost, environmentally friendly, degradable in matrix, capable of effectively preventing urea from absorbing moisture and caking and the like, and is suitable for large-scale preparation and used in agricultural production.

The invention discloses a bionic anti-drag protective film based on a surface micro-nano structure and a preparation method of the bionic anti-drag protective film, and relates to the technical field of anti-drag film preparation. According to the preparation method, the high-strength nitrogen-containing thermoplastic polyurethane film layer with the flame retardant property is prepared, one layer is coated with the hyperbranched polyurethane coating, the drag reduction functional layer with the microstructure is formed through embossing and photo-thermal dual curing, and the hyperbranched polyurethane coating can form a high-density cross-linked network during curing, so that the drag reduction performance is improved; according to the present invention, the hyperbranched polyurethane coating material has characteristics of good mechanical property and good weatherability, the hyperbranched structure can assist in dispersion of shrinkage stress and maintenance of coating surface flatness during heating, and the hyperbranched polyurethane coating material further contains nitrogen rings so as to provide the coating material with certain fire resistance.

The invention discloses resin composite liquid with dual self-repairing and high ethanol solvent wiping resistance as well as a preparation method and application of the resin composite liquid, and belongs to the technical field of polyurethane emulsion coatings. Aiming at the problems that an existing waterborne polyurethane coating is poor in ethanol resistance due to residual carboxyl / hydroxyl of a hydrophilic chain extender and the self-repairing efficiency of a single dynamic bond is low, a metal ion buffer solution is added into a hydroxyl-terminated polyurethane emulsion to coordinate with the carboxyl of the hydrophilic chain extender, so that a hydrophilic group is closed, and the crosslinking density is increased; meanwhile, a boric acid compound is introduced to form dynamic boric acid ester bonds with residual hydroxyl groups of the system, and hydrophilic groups in the system are consumed while a dual self-repairing network is constructed. The coating prepared by the invention has good self-repairing and ethanol wiping resistance.

The invention belongs to the technical field of preparation and surface protection of polyurethane coatings, and particularly relates to weather-resistant polyurethane and a preparation method thereof. The coating provided by the invention is composed of a component A and a component B according to a weight ratio of 1: (0.2-0.4). The component A is prepared from water-based fluorine-containing hydroxy acrylic dispersion resin with a high hydroxyl value, GMA (glycidyl methacrylate) grafted modified water-based acrylic dispersion resin, a benzotriazole ultraviolet light absorber, a light hindered amine stabilizer, rutile titanium dioxide, wet sericite powder, nano zinc oxide and auxiliaries; and the component B comprises an aliphatic isocyanate curing agent and propylene glycol diacetate. By constructing a quadruple synergistic weather-resistant mechanism of ultraviolet absorption, free radical capture, physical shielding and structural densification, the weather resistance and corrosion resistance of the coating are remarkably improved while the coating keeps excellent adhesive force (0-1 level) and hardness (2H-3H), the color change delta E is smaller than or equal to 1.8 after artificial accelerated aging for 1000 hours, the gloss loss rate is smaller than or equal to 23%, and the weather resistance and corrosion resistance of the coating are greatly improved. And the corrosion spreading width of a 600-hour salt spray test lineation is less than or equal to 2.3 mm.

The invention belongs to the technical field of photovoltaic backboards, and particularly relates to a high-reflection integrally-formed backboard for a single-glass assembly and a preparation method thereof.The preparation method comprises the following steps that S1, a PET film base material is provided, plasma surface treatment is conducted, then polyurethane coating is coated on the two sides to form an outer-layer weather-proof fluorine coating and an inner-layer functional coating respectively, and the outer-layer weather-proof fluorine coating and the inner-layer functional coating are formed; a CPC backboard base material is obtained; s2, white high-reflection EVA granules are fused and plasticized, a white EVA adhesive film is obtained through extrusion of a hanger type T-shaped flat die head, then the white EVA adhesive film is compounded with the inner functional coating of the CPC backboard base material, and a firm complex without a definite physical interface is obtained through rolling; s3, cooling the composite body through at least two stages of cooling rollers to obtain a coiled material; and S4, the coiled material is irradiated, and the high-reflection integrally-formed backboard is obtained.

The invention relates to the technical field of protective films, and discloses a mobile phone protective film and a preparation method thereof. Modified graphene oxide is used as a filler, a modified waterborne polyurethane emulsion is used as a film forming substance, a flatting agent and a defoaming agent are used as auxiliary materials, a waterborne polyurethane coating is prepared, the surface of a PET base material is coated with the waterborne polyurethane coating, then drying is conducted, and the mobile phone protection film is obtained. A quaternary ammonium salt group and negative charges on a bacterial cell membrane generate electrostatic attraction, so that the original structure and function of the cell membrane are destroyed, and a bactericidal effect is achieved; silanol groups generated by hydrolysis of silane groups can react with hydroxyl groups and carboxyl groups on the surface of a PET base material, so that the interface bonding force between the coating and the base material is improved; nitrogen atoms in pyrrolidone groups form hydrogen bonds with hydroxyl groups and carboxyl groups on the surface of a base material, so that the bonding strength of the coating and the base material is further improved; the adamantyl group is grafted into the graphene oxide, so that the supporting effect of the graphene oxide on the waterborne polyurethane is enhanced, and the mechanical property of the mobile phone protective film is improved.

The invention relates to the technical field of wave-absorbing coatings, and discloses a radar wave-absorbing coating and a preparation method thereof.The radar wave-absorbing coating is prepared from, by weight, 100 parts of waterborne polyurethane emulsion, 0.4-1.6 parts of graphene oxide, 0.3-2 parts of modified ferroferric oxide and the like; a plurality of hydrophilic hydroxyl groups and carboxyl groups are introduced on the surface of the nano ferroferric oxide, so that the surface hydrophilicity is improved, and the nano ferroferric oxide is uniformly dispersed in the waterborne polyurethane coating, so that the coating has higher mechanical strength and tensile property. And a plurality of hydroxyl groups and carboxyl groups introduced on the surface of the nano ferroferric oxide and hydroxyl groups and carboxyl groups on the surface of the graphene oxide interact with each other to form hydrogen bonds and the like, so that the interface action between the nano ferroferric oxide and the graphene oxide is improved, the impedance matching performance of the nano ferroferric oxide and the graphene oxide is improved, the interface polarization effect is formed, and the absorption effect of the coating on electromagnetic waves is improved.

The present invention relates to the technical field of polyurethane coatings, and in particular to a polyurethane coating with sufficient tack-free dryness and a preparation method therefor. In the present invention, ethylene glycol, potassium methoxide, and glycidol are used to prepare a branched polyglycidyl ether and silicon dioxide is modified using the branched polyglycidyl ether. The addition of the branched polyglycidyl ether improves the compatibility of the modified silicon dioxide in a modified polyurethane emulsion, thereby enhancing the hydrophobicity and corrosion resistance of the coating. The backbone of the branched polyglycidyl ether has a high molecular weight, providing a large number of crosslinking sites, and by adding the branched polyglycidyl ether-modified silicon dioxide to the polyurethane coating, the water resistance of the polyurethane coating is enhanced. In the present invention, benzotriazole is also loaded on the silicon dioxide as a corrosion inhibitor, thereby imparting a corrosion-resistant effect to the coating.

The invention discloses an environment-friendly anti-icing and deicing coating as well as a preparation method and application thereof, and aims to solve the problems of low efficiency, high corrosivity, serious environmental pollution and the like in the traditional anti-icing and deicing technology. The coating material is prepared from the following components: deionized water, polyvinylpyrrolidone, propylene glycol, glycerol, fumed silica, granular silica, ethanol, potassium acetate and a waterborne polyurethane coating. The invention further provides a preparation method of the coating material, and the coating material is applied to anti-icing of metal and plastic substrates and has dual functions of preventing icing and rapidly removing ice. The coating has the advantages of being good in durability, environmentally friendly, free of corrosion to base materials and the like, is particularly suitable for anti-icing protection of equipment such as rails, wind power blades and cables, remarkably improves the operation and maintenance efficiency of key facilities and equipment, reduces the maintenance cost and has important economic and social benefits.

The invention provides a super wear-resistant polyurethane floor coating and a preparation method thereof, the super wear-resistant polyurethane floor coating comprises a component A, a component B and a component C. The component A comprises glycidyl ether compound modified polyisocyanate; the component B comprises a latent imine curing agent, a diluent, a functional auxiliary agent and a pigment filler; the component C comprises aggregate; the mass ratio of the component A to the component B to the component C is (4-6): (2-4): (1-3). By optimizing and modifying the components in the super wear-resistant polyurethane coating, the properties such as high hardness, excellent wear resistance and the like of the super wear-resistant polyurethane finish paint are maintained; the interlayer adhesive force between the super-wear-resistant polyurethane floor finish paint material and various epoxy floating coatings can be obviously improved, and the construction matching property in a high-humidity environment and the wear resistance of a whole floor coating system are improved.

The invention relates to a waterproof roll with good anti-aging performance and a production method thereof, and discloses a waterproof roll with good anti-aging performance and a production method thereof. The waterproof roll is prepared by optimizing materials of a modified base material layer, a reinforced fiber layer and a functional surface layer and structurally arranging a multi-layer composite sealing structure and a glass fiber reinforced strip; the anti-aging performance, the waterproof performance and the structural stability of the waterproof coiled material are effectively improved. The composite material is characterized by comprising a modified base material layer, a reinforced fiber layer and a functional surface layer, the reinforced fiber layer is arranged between the modified base material layer and the functional surface layer; the modified base material layer is prepared from the following components in parts by weight: 60 to 70 parts of SBS-APP composite modified asphalt, 10 to 15 parts of a nano composite anti-aging agent, 5 to 8 parts of a plasticizer, 10 to 15 parts of a filling agent and 2 to 4 parts of an antioxidant; the reinforced fiber layer comprises the following components in parts by weight: 70-80 parts of aramid fiber-polyester blend fiber, 5-10 parts of an anti-aging additive, 10-15 parts of a binder and 2-3 parts of a coupling agent, and the functional surface layer is composed of a modified polyurethane coating and nanoscale light stabilization particles dispersed in the modified polyurethane coating.

The invention provides an acrylic polyurethane coating and a preparation method thereof, and belongs to the technical field of coating compositions.The preparation method comprises the following steps that hexylpolyurethane based on non-isocyanate sorbitol, methacrylic anhydride, p-toluenesulfonic acid and hydroquinone monomethyl ether are mixed and heated for a reaction, ethyl acetate is added for mixing, washing, drying, filtering and vacuum concentration are performed, and the acrylic polyurethane coating is obtained. The bio-based polyurethane acrylate is obtained; the preparation method comprises the following steps: mixing ZG nanoparticles, methylbenzene, 3-(methacryloyloxy) propyltrimethoxysilane and hydroquinone monomethyl ether, heating, stirring, centrifuging and washing to obtain functionalized ZG; and fully mixing the bio-based polyurethane acrylate, the photoinitiator, the acrylate-based single-terminated reactive polysiloxane, the reactive diluent and the functionalized ZG to obtain the acrylic polyurethane coating. The coating can improve the curing speed, and has hydrophobic and oleophobic properties and corrosion resistance at the same time.

The invention belongs to the technical field of anticorrosive coatings, and particularly relates to an anticorrosive polyurethane coating as well as a preparation method and application thereof. The anticorrosive polyurethane coating comprises polyurethane resin, modified graphene, a curing agent and a solvent, alkoxy silane is grafted on the surface of the modified graphene, and the number of layers of the modified graphene is less than or equal to 4. The anticorrosive polyurethane coating disclosed by the invention has the beneficial effects that the anticorrosive polyurethane coating disclosed by the invention can form a compact physical barrier by mixing graphene with few lamellas and a large radius-thickness ratio with polyurethane resin, and also can play a role in toughening; graphene is adopted as modified graphene grafted with alkoxy silane, the graphene-resin interface bonding force is improved by adding the modified graphene, the graphene is stably dispersed in the resin, and the graphene is induced to be directionally arranged in the curing process so as to enhance the adhesion performance of the graphene; by optimizing the addition amount of graphene, on the premise that the thickness of the coating is not increased, the shielding property of the coating is remarkably enhanced, and meanwhile excellent adhesive force and impact resistance are kept.

The invention belongs to the technical field of battery packaging, and particularly relates to a battery soft package composite film and a preparation method thereof. The battery soft package composite film comprises an organic silicon polyurethane coating, a first aluminum foil anti-corrosion treatment layer, an aluminum foil layer, a second aluminum foil anti-corrosion treatment layer, an easy-to-adhere resin layer and a polypropylene heat sealing layer which are sequentially arranged from outside to inside. According to the battery soft package composite film, the organic silicon polyurethane coating is adopted to replace an outer layer material in a conventional aluminum plastic film structure, and by means of the weather resistance, temperature resistance and chemical stability of the organic silicon polyurethane coating, the overall forming performance of the aluminum plastic film can be improved; the organosilicon polyurethane coating has a certain smooth effect, so that the surface friction coefficient is reduced to a certain extent; in addition, due to the hydrophobic performance of the organic silicon structure, the long-term high-temperature and high-humidity performance is also improved to a certain extent.

The utility model belongs to the technical field of polyurethane coating toning and feeding, and particularly relates to a feeding tool for waterborne polyurethane coating toning, which comprises a feeding cylinder, a sealing shell, a pressing block and a feeding pipe, the sealing shell is arranged at the upper end of the feeding cylinder, the pressing block is arranged on the inner side of the sealing shell, and the feeding pipe is arranged in the middle of the inner side of the sealing shell. By arranging the sliding groove, the spring, the main control piston mechanism, the extrusion disc, the sealing piston head, the limiting block and the flow guide groove, the feeding cylinder is aligned to the position where feeding is needed, and raw materials are conveyed into the material injection groove through the feeding cylinder and then flow into the inner side of the sealing shell through the through hole in the side end of the bottom of the material injection groove. By applying pressure to the pressing block, the pressure is conducted to the main control piston mechanism to enable the spring to contract until the sealing piston head penetrates through the tail end of the feeding cylinder, and raw materials flow out of the flow guide groove. After charging is completed, only pressure applied to the pressing block needs to be stopped, the main control piston mechanism is jacked up after the spring rebounds, and the sealing piston head moves upwards to be reset.

The utility model discloses a high-strength hot stamping foil which comprises a base film layer, a hot melt adhesive layer, an aluminum layer, a pigment layer and a protective layer which are sequentially stacked, the base film layer is a modified polyester film, and the surface of the aluminum layer is provided with a micropore structure; the pigment layer is composed of nano pigment particles, and the protective layer is a modified polyurethane coating. According to the utility model, the base film layer improves the mechanical strength and tensile property of the hot stamping foil, so that the hot stamping foil is not easy to deform or break under the action of high temperature and mechanical stress; the hot melt adhesive layer improves the bonding strength and heat resistance of the hot melt adhesive; the protective layer can effectively prevent the hot stamping foil from being abraded due to friction in the using process.

The invention relates to an interlayer separant and application thereof. The interlayer separant is used between a polyurethane coating and an asphalt coiled material and is formed by a polyurethane coating, and the polyurethane coating comprises the following components: maleic anhydride modified polyurethane, silane modified polyurethane, maleic anhydride modified colloid and a solvent; the maleic anhydride modified polyurethane is obtained by reaction of raw materials including polyol, maleic anhydride, isocyanate and a catalyst; the silane modified polyurethane is obtained by reaction of raw materials including polyol, a silane coupling agent, isocyanate and a catalyst; the colloid is selected from one or a combination of more of petroleum resin, asphalt, rosin resin, terpene resin, butadiene-styrene rubber and butyl rubber; the maleic anhydride modified colloid is obtained by reacting raw materials including maleic anhydride, colloid and an initiator. The interlayer separant can isolate migration of auxiliaries such as a plasticizer in a traditional polyurethane coating and improve the compatibility and bonding performance of the traditional polyurethane coating and an asphalt coiled material.

The utility model discloses an ecological board surface spraying structure, and particularly relates to the technical field of ecological boards, wood fibers or other natural fibers are mixed with resin to form the ecological board surface spraying structure, the ecological board surface spraying structure has good strength and durability after being pressed, mineral filler is filled in a fiber board layer, the hardness, the pressure resistance and the abrasion resistance of the board are improved, and the ecological board surface spraying structure is more environment-friendly. The reinforcing layers are located on the two sides of the fiberboard layer, each reinforcing layer comprises a hot melt adhesive film, a UV coating and a polymer plastic board layer and is used for improving the structural strength and the overall stability, the waterproof layer comprises a polypropylene coating, a PU coating and a polyurethane coating, the waterproof performance is effectively improved, water is prevented from invading the fiberboard layer, and the bending resistance of the board is enhanced through the reinforcing layers; the waterproof layer effectively prolongs the service life of the ecological board, protects the ecological board from being influenced by a humid environment, keeps the functions of the ecological board unchanged for a long time, and comprehensively applies a coating technology, so that the ecological board meets higher requirements in the aspects of strength, durability and waterproof performance.

The invention relates to the technical field of coatings, in particular to a graphene modified polyurethane coating with an electromagnetic shielding function. The coating is composed of deionized water, a graphene modified polyurethane emulsion, silver nanoparticles and an auxiliary agent, a synergistic modification system of hydroxylated graphene and p-hydroxybenzoic acid is introduced in a polyurethane prepolymerization stage, an organic-inorganic synergistic network with good interface compatibility is formed, the conductivity and electromagnetic shielding effect of the coating are remarkably improved through a formed compact conductive path, and meanwhile the flexibility and adhesive strength of polyurethane are kept. The coating is compact in structure, high in adhesive force, good in conductive continuity and excellent in electromagnetic shielding effect, and can be widely applied to the field of electromagnetic protection of electronic equipment shells, communication devices and aerospace equipment.

The invention discloses a waterborne polyurethane coating and a preparation method and application thereof, and belongs to the technical field of coatings, the waterborne polyurethane coating is characterized in that the waterborne polyurethane coating comprises a main agent and a curing agent, the weight ratio of the main agent to the curing agent is (4-8): 1, and the main agent, the curing agent and the main agent are mixed to form the waterborne polyurethane coating. Comprising the following raw materials in parts by weight: 50-60 parts of a water-based hydroxy acrylic dispersion, 0.5-1 part of a wetting leveling agent, 0.5-1 part of a surfactant, 1-5 parts of a coalescing agent, 0.1-2 parts of a thickening agent and 24-40 parts of deionized water. The waterborne polyurethane coating obtained by the invention can have good adhesive force on composite materials such as carbon fibers and glass fibers.

The utility model discloses a floor board with a good stain-resistant effect, which comprises a board body, a wear-resistant layer is arranged on the outer surface of the board body, the wear-resistant layer comprises a polyurethane coating and a fluorocarbon rubber coating, a stain-resistant layer is arranged on the outer surface of the wear-resistant layer, the stain-resistant layer comprises a polypropylene coating and an epoxy resin coating, the board body comprises a substrate layer, and the substrate layer comprises a polyurethane coating and a fluorocarbon rubber coating. A clamping groove part is arranged on the left side of the base layer, a protruding part is arranged on the right side of the base layer, the polyurethane coating is arranged on the outer surface of the plate body in a coating mode, the fluorocarbon rubber coating is arranged on the outer surface of the polyurethane coating in a coating mode, the polypropylene coating is arranged on the outer surface of the fluorocarbon rubber coating in a coating mode, and the epoxy resin coating is arranged on the outer surface of the polypropylene coating in a coating mode. According to the utility model, the stain-resistant layer is arranged, the epoxy resin coating contained in the stain-resistant layer can carry out first-layer stain-resistant protection treatment on the plate body, and the polypropylene coating can carry out second-layer stain-resistant protection treatment on the plate body after the epoxy resin coating is damaged, so that the stain resistance of the whole plate body is effectively improved.

The invention discloses a self-cleaning bionic anti-drag film based on a sharkskin surface structure and a preparation process of the self-cleaning bionic anti-drag film, and relates to the technical field of bionic anti-drag film preparation. According to the invention, resorcinol bis (2-hydroxyethyl) ether, 3, 3 ', 4, 4'-benzophenone tetracarboxylic dianhydride and the like are used as raw materials to prepare polyol containing an ester bond and an ether bond, the polyol reacts with 4, 4-diisocyanate dicyclohexylmethane to obtain a thermoplastic polyurethane film with high temperature resistance, and the polyol is also used for preparing an antistatic polyurethane coating, so that the antistatic polyurethane coating has high temperature resistance. And quaternary ammonium salt and sulfhydrylated titanium dioxide are introduced, so that the anti-drag layer formed after embossing and curing has antistatic and self-cleaning properties at the same time.

This invention relates to an aqueous polyurethane composition comprising: a liquid medium comprising at least one organic liquid having a solubility in water of ≥4 g organic liquid / 100 g water at 25°C, and water; at least one polyurethane polymer compound dispersed in the liquid medium; and optionally at least one coating formulation component. The polyurethane composition further comprises at least one thickener comprising at least one anionic polymer selected from anionic polyacrylamide, anionic polymethacrylamide, anionic polyacrylamide-polymethacrylamide, and / or a mixture of at least two thereof, and optionally, 0 to 0.12% by weight, preferably 0 to 0.05% by weight, more preferably 0 to 0.01% by weight, based on 100% of the total weight of the aqueous polyurethane composition, at least one compound selected from unbound or ionicly bound organic amines, ammonia, or a mixture of at least two thereof, wherein the aqueous polyurethane composition has a pH value ≤ 8.5, and wherein the at least one thickener is different from the at least one coating formulation component and the at least one polyurethane polymer. The present invention further relates to a kit-of-parts for preparing a waterborne polyurethane composition, a method for preparing a waterborne polyurethane composition, and the use of the waterborne composition.

The application discloses basalt flake anti-scratch polyurethane paint, a preparation method and application thereof, the paint comprises a component A and a component B with a mass ratio of 4-6:1, the resin in the component A comprises modified hydroxyl acrylic resin and hydroxyl acrylic resin; wherein the modified hydroxyl acrylic resin is prepared from raw materials comprising the following components: wear-resistant component with double bonds 20-50%, acrylic monomer 10-20%, hydroxyl acrylic monomer 15-30%, second solvent 20-30% and dibenzoyl peroxide 0.5-3%. The component A of the paint adopts low-density modified hydroxyl acrylic resin containing hard wear-resistant particles, the resin is blended with traditional resins, and the low-density resin containing hard wear-resistant particles prepared in the paint will float on the surface of the coating during the surface drying process, so that a hard wear-resistant surface layer is formed, the hardness can reach more than 4H, and the paint not only has wear resistance, but also can well protect the paint from being scratched by sand or sharp objects.

The invention discloses a preparation method of jatropha curcas oil-based waterborne polyurethane emulsion, and relates to a preparation method of a high polymer material polyurethane emulsion, the method is a synthesis method of amino silicon oil (KH550) modified bio-based polyurethane used in the textile field, jatropha curcas oil is used as a raw material, and functional molecular design is adopted to prepare the jatropha curcas oil-based waterborne polyurethane emulsion. KH550 is introduced by virtue of a catalyst-free green chemical process to synthesize controllable jatropha curcas oil-based polyol, and the controllable jatropha curcas oil-based polyol is further polymerized with isophorone diisocyanate (IPDI) through chain structure design to prepare a jatropha curcas oil-based waterborne polyurethane coating dispersion which is subsequently applied to the surface of a fabric. The preparation method aims at preparing the high-performance textile coating and enhancing the hydrophobic and antifouling properties of the fabric. The work not only has important significance on design and application of a sustainable bio-based waterborne polyurethane textile finishing agent in the textile industry, but also widens the application field of non-grain bio-based materials.

The invention discloses an efficient polyurethane coating and spraying device for fertilizer, and belongs to the technical field of fertilizer coating, the efficient polyurethane coating and spraying device comprises a roller, a base is arranged at the bottom end of the roller, and a screen drum is mounted at the discharging end of the roller; the spraying assembly is located in the center of the roller; the air injection assembly is located below the spraying assembly; according to the fertilizer coating device disclosed by the invention, by arranging the spraying assembly, when a fertilizer is coated, a push rod can be driven to move through movement of an electric push rod, and a spray head frame can be driven to swing through a connecting ring; according to the device, a first spraying head is arranged, so that a coating material on the surface of a fertilizer can be more uniform by changing the angle of the first spraying head in the spraying process, the coating quality is ensured, and meanwhile, a mounting plate and a spraying head frame can be driven to rotate by rotating a connecting plate, so that the orientation of the first spraying head is changed; furthermore, the first spray head can be adjusted according to different fertilizers, so that the spraying uniformity is further ensured.

The invention relates to a skin-friendly sweat-permeable fabric and a preparation method thereof, and belongs to the technical field of fabrics. The fabric is composed of closely woven base cloth and a modified polyurethane coating on the surface. The modified polyurethane is formed by copolymerization of diisocyanate, dihydric alcohol, a hydrophilic chain extender and a special modified alcohol monomer, the monomer is prepared by hydrosilylation of a linear end hydrogen-containing polysiloxane oligomer and monoalkenyl alcohol, and the structure of the monomer is that two ends are alcoholic hydroxyl groups, and the middle part is connected with a short siloxane chain through a long-chain alkyl group. After the structure is embedded into a polyurethane main chain as a key unit, microphase separation is induced to be generated, a nanoscale hydrophobic microgap network is formed in the coating, efficient physical moisture permeability is achieved, and water pressure resistance is not affected; a stable and discontinuous low-surface-energy micro-area is formed on the surface of the coating, so that the fabric is dry and smooth in touch.

The application relates to the technical field of paint, in particular to a single-component polyurethane paint and a preparation method thereof; the single-component polyurethane paint comprises the following components in parts by weight: 100 parts of polyether polyol, 40-45 parts of diphenylmethane diisocyanate, 25-30 parts of modified castor oil, 15-18 parts of reinforcing filler, 1.0-1.5 parts of light stabilizer and 0.1-0.2 parts of organic tin catalyst. The single-component polyurethane paint solves the problems that the reinforcing filler is prone to sedimentation and the storage stability is poor through the design of the modified castor oil and the optimization of the formula, the process flow is simple and easy to implement, the coating shows excellent adhesion, and the strict requirements for high-performance coating in many fields such as textile shoes and clothes, automobiles and buildings can be fully met.

The utility model discloses a wear-resistant automobile cover which comprises an automobile cover body, the automobile cover body comprises a self-repairing layer, an ultraviolet-proof layer, a waterproof layer, a heat dissipation layer and a bottom cover, and the self-repairing layer, the ultraviolet-proof layer, the waterproof layer, the heat dissipation layer and the bottom cover are sequentially arranged from top to bottom. The self-repairing layer is a polyurethane coating containing chitosan and an oxetane structure, the bottom cover is made of polyester fibers, and by arranging the self-repairing layer, when the surface of the coating is scratched, the annular structure of oxetane in the self-repairing layer is broken and can generate chemical reaction after being exposed, and when ultraviolet light irradiates, the surface of the coating is not damaged, so that the surface of the coating is not damaged. The exposed tail ends of the chitosan and the oxetane in the coating attract each other and are combined together to repair the annular structure, so that the self-repair of the damaged part of the coating is realized, and the wear resistance and the practicability of the automobile cover are improved.

The application discloses a kind of bio-based water-based self-phosphorization coating and its preparation method and application, including the mass ratio of 1:0.3-9 bio-based polysaccharide phosphate and water-based polyurethane curing agent, by bio-based polysaccharide phosphate as the hydroxyl component of coating and water-based polyurethane curing agent form coating, phosphoric acid group in coating can form phosphating film on the surface of metal base material, while keeping the anticorrosion performance of polyurethane coating, effectively save fossil energy, and the flexibility, compactness, salt and acid and alkali resistance of coating after curing are good.