10 results about "Polyurethane adhesive" patented technology

The invention discloses an environment-friendly polyurethane adhesive, and a preparation method and applications thereof. The environment-friendly polyurethane adhesive comprises a polyurethane resin A component, a polyurethane resin B component, and a catalyst. The polyurethane resin B component comprises isocyanate 1 and isocyanate 2, wherein the isocyanate 1 is isophorone diisocyanate, and the isocyanate 2 is one or more of m-xylidenediisocyanate (XDI), hexamethylene diisocyanate (HDI) trimer, and 1,5-naphthalene diisocyanate (NDI). The catalyst is a mixture of a delaying catalyst and a low temperature thermal sensitive catalyst. The problem of bad yellowing resistant performance of conventional adhesives is prominently improved. The heatproof property, flexibility, and hydrolysis resistant performance of finished products of adhesive are all enhanced. Moreover, the provided adhesive is environment-friendly and degradable, and can be easily recovered and utilized. The resources are saved, the operability of the adhesive is improved, and the curing time of the adhesive is shortened.

The invention relates to a preparation method for a super-hydrophobic/super-oleophylic loofah sponge fiber and an application thereof. The method comprises the following steps: pretreating loofah sponge fiber with sodium hydroxide and hydrogen peroxide and standing by; taking a certain amount of polyurethane adhesive and gas-phase nano-silica and adding into an acetone solvent; ultrasonically dispersing for 2-4 hours, thereby acquiring an acetone dispersion liquid; adding the pretreated loofah sponge fiber into the acetone dispersion liquid and ultrasonically dispersing for 2-10 hours; and drying in an oven, thereby acquiring the super-hydrophobic/super-oleophylic loofah sponge fiber used for effectively separating oil or organic solvent from water mixture. The preparation method provided by the invention is simple and quick; the used raw materials are economical, easily acquired and easy to degrade; the virulent fluorine-containing surfactant is not required; the prepared super-hydrophobic/super-oleophylic loofah sponge fiber has higher stability, excellent super-hydrophobic property and efficient oil water separation capacity; and besides, the prepared super-hydrophobic/super-oleophylic loofah sponge fiber has excellent strong acid resistance, strong base resistance, high salinity resistance, high temperature resistance and extensive social benefit and economic benefit.

The invention relates to a preparation method of pearlescent anti-crease waterproof moisture-permeable polyurethane synthetic leather. The preparation method comprises the steps: weighing raw materials of a surface layer, mixing activated carbon, nitrocellulose, a dried color material, a pearl powder and colored plastic particles, then grinding, adding a proper amount of an acetic acid solution and polyurethane, adjusting the pH to be neutral, carrying out freeze drying, then grinding, adding the remaining raw materials, and stirring, to obtain a surface layer slurry; evenly coating release paper with the surface layer slurry, and drying to form a surface layer; weighing raw materials of a middle layer, mixing expanded graphite, quartz sand, magnesium oxide and aluminum hydroxide, then calcining the mixture, adding a stripping agent BYK-325, then treating for 1-2 h, cooling, then adding boric acid and wood powder, grinding, adding the remaining raw materials, and stirring to obtain a foaming layer slurry; mechanically foaming the prepared foaming layer slurry, then evenly coating the surface layer with the foamed foaming layer slurry, and drying; coating the foaming layer with a water-based polyurethane adhesive slurry, bonding with a base cloth layer, and then drying; and peeling off the release paper, trimming, rolling, and thus obtaining the synthetic leather finished product.

The invention discloses a method for manufacturing polyurethane flexible foam packing plates. The method include steps of preparing materials, in other words, preparing, by weight, 30-40% of saw dust, 8-10% of adhesive and the balance leftovers of crops, pouring the materials into a glue mixer and uniformly mixing the materials; performing paving, in other words, coating a layer of adhesive on each single slab, paving each single slab on a steel plate, and enabling the surface, where the adhesive is coated, of each single slab to face upwardly; placing the steel plates on a conveyor belt; uniformly paving mixtures on the single slabs by the aid of a paver; laying a layer of single slabs on each mixture; performing pressurization and solidification, in other words, feeding paved plate blanks into a hot press, heating and pressurizing the plate blanks at the temperature of 140-170 DEG C, maintaining the pressure for 6-10 minutes and solidifying and forming the plate blanks; performing mold releasing and edge cutting, in other words, releasing the solidified plate blanks from molds and cutting the edges of the plates. Adhesive is brushed on the surface of each single slab which is paved on the corresponding mixture. The adhesive is polyurethane adhesive. The method has the advantages that the plates are high in bonding strength and elasticity, and the purpose of protecting environments can be achieved by the plates.

The invention discloses a preparation method of a graphene modified polyurethane adhesive, and the method comprises the following steps: uniformly dispersing 0.5-1 part by weight of graphene oxide in10 parts by weight of absolute ethyl alcohol, and reacting with 20 parts by weight of polyisocyanate to obtain a polyisocyanate-graphene oxide mixed solution; reacting 25 parts of triethanolamine, 30parts of sodium hydroxyethyl sulfonate, 33 parts of n-decane and 0.5 part of metallic sodium to obtain sulfonated dihydric alcohol; adding 8 parts of absolute ethyl alcohol, dissolving, and carrying out reduced pressure distillation to obtain sulfonic acid group-containing dihydric alcohol; and carrying out reduced pressure distillation on 60 parts of polyester polyol and 10 parts of the sulfonicacid group-containing dihydric alcohol, reacting with the polyisocyanate-graphene oxide mixed solution, and adding a thickening agent and a defoaming agent into the reactant subjected to chain extension to obtain the graphene modified polyurethane water-based adhesive. The adhesive is high in graphene content, good in dispersity, not prone to agglomeration, environmentally friendly and resistant to bacteria, and the use performance and the storage stability of the adhesive are greatly improved.

The invention discloses a solvent-free polyurethane adhesive for textiles, and a preparation method thereof. The preparation method comprises the following steps: adding a functional filler into a modification system, adding ammonium thiocyanate and maleic anhydride while stirring at 60 DEG C, stirring the obtained system for 35 min, adding a basic system, stirring the obtained system at 110 DEG Cfor 85 min, and naturally the obtained system to obtain the solvent-free polyurethane adhesive for textiles. The obtained product can keep the peel strength within a long period, has no color changewhen exposed to ultraviolet rays for a long time, and has excellent flame retardancy.