7930results about "Polyureas/polyurethane adhesives" patented technology

The present invention provides a composite binder for a sulfide solid-state battery, a preparation method thereof and an application thereof, wherein the composite binder comprises a binder A, a binder B and a solvent, wherein the mass ratio of the binder A to the binder B is (1-10):(5-1), and the mass ratio of the total mass of the binder A and the binder B to the solvent is 1:(10-100). The present invention adopts a binder having a polar functional group and a low-polarity / non-polar binder for combination, thereby making the prepared composite binder have good compatibility with the sulfide solid electrolyte, that is, it does not affect the ionic conductivity of the sulfide solid electrolysis, and at the same time makes the sulfide solid electrolyte membrane have good mechanical properties and flexibility.

The invention discloses an OCA optical adhesive and a preparation method thereof, and relates to the technical field of adhesives, and the OCA optical adhesive is prepared from the following raw materials in parts by weight: 35-45 parts of acrylate-terminated hyperbranched organosilicon modified polyurethane, 2-4 parts of allyl succinimido carbonate, 1-3 parts of hexafluorobisphenol A diacrylate, 1-3 parts of 1, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, 1-3 parts of 1, 3-pentanediol monoisobutyrate, 1-3 parts of 1, 3-pentanediol monoisobutyrate, 1-3 parts of 1, 3-pentanediol The invention relates to a photocurable adhesive, which is prepared from the following components in parts by weight: 20 to 30 parts of a diluent, 0.6 to 1.2 parts of a photoinitiator, 0.5 to 1 part of an antioxidant and 0.5 to 1 part of a de-foaming agent. The photocurable adhesive is prepared from the following components in parts by weight: 1 to 5 parts of 1, 3-bis (oxiranyl methyl)-5-(2-propenyl)-1, 3, 5-triazine-2, 4, 6 (1H, 3H, 5H)-triketone, 3 to 5 parts of 2, 2 '-bis (trifluoromethyl) diaminodiphenyl, 6 to 8 parts of other polymerizable monomers, 20 to 30 parts of the diluent, 0.6 to 1.2 parts of the photoinitiator, 0.5 to 1 part of the antioxidant and 0.5 to 1 part of the de-foaming agent. The OCA optical adhesive is good in bonding performance, sufficient in weather resistance and environmental protection performance and good in oil resistance.

To provide a decorative laminate excellent not only in initial adhesiveness between a substrate and a decorative sheet, but also in final adhesiveness without occurrence of floating and peeling of the decorative sheet even in the case of having a groove part.SOLUTION: A decorative laminate includes a substrate and a decorative sheet, which are laminated through an adhesive. To a side part and a plane surface part of the substrate, the decorative sheet is continuously laminated. The adhesive is made from crystalline polyester polyol (a1-1) having a melting point of more than 80°C and 140°C or less as raw material. The amount of the crystalline polyester polyol (a1-1) used is in the range of 5 to 45 parts by mass in 100 parts by mass of a polyol (a) and a polyisocyanate (b) in total.SELECTED DRAWING: None

The invention relates to the technical field of protective films, in particular to a low-viscosity low-climbing polyurethane optical protective film and a preparation method thereof. The preparation method comprises the following steps: carrying out sulfydryl-alkene click reaction on double-bond-containing hyperbranched polyester, 1H, 1H, 2H, 2H-perfluorodecanethiol and sulfydryl-containing organic silicon, and introducing a fluorine-containing chain segment and a siloxane chain segment to obtain modified hyperbranched polyester; then introducing the modified hyperbranched polyester into polyurethane through a grafting modification method, so as to prepare the polyurethane adhesive; and coating the surface of a base material with the polyurethane adhesive, compounding with a release film, and curing to obtain the polyurethane optical protective film. The polyurethane optical protective film prepared by the invention has excellent low viscosity and low climbing performance, can effectively protect the surface of an optical device from being polluted and damaged, and improves the service life and stability of the optical device.

The invention belongs to the technical field of polyurethane pouring sealants, and particularly relates to a two-component hydrophobic heat-resistant polyurethane pouring sealant and a preparation method thereof. The pouring sealant is prepared by reacting a component A and a component B, the component A is prepared from the following raw materials in parts by weight: 17 to 33 parts of modified polyether polyol I; 15 to 27 parts of modified polyether polyol II; 18 to 30 parts of diisocyanate; 20 to 34 parts of a plasticizer; the component B is prepared from the following raw materials in parts by weight: 47 to 64 parts of polyether polyol III; 36 to 53 parts of filler; and 0.15 to 0.35 part of a catalyst. Introducing a silicon-oxygen-silicon chain segment into a polyether polyol structure through acrylic acid bridging to prepare siloxane modified polyether polyol; more side ethyl, phenyl and neopentyl structures are introduced into the polyether polyol, so that the intrinsic hydrophobicity and temperature resistance of the raw materials are further improved, and the polyurethane pouring sealant shows relatively high hydrophobicity and heat resistance.

The invention discloses a medium-temperature curing high-temperature-resistant high-adhesion epoxy structural adhesive film as well as a preparation method and application thereof. The preparation method comprises the following steps: reacting high-rigidity diisocyanate with polyether polyol to obtain a polyurethane prepolymer, then adding bisphenol epoxy resin to carry out grafting reaction, and then adding carboxyl-terminated nitrile rubber to react with an epoxy group to obtain the high-temperature-resistant high-adhesion epoxy resin. And finally, mixing with a curing system and coating to obtain the intermediate-temperature curing high-temperature-resistant high-adhesion epoxy structural adhesive film. The preparation process disclosed by the invention is reasonable, and the high-temperature resistance of the adhesive film is remarkably improved by introducing high-rigidity groups such as naphthalene ring, biphenyl or p-benzene while the excellent processing property of the adhesive film is ensured; and through the synergistic effect of the polyurethane flexible chain segment and the nitrile rubber, the toughness and the adhesive property of a resin system are improved, and the loss of the resin in the forming process is reduced.

The invention relates to the field of adhesives, and particularly discloses an OCA optical adhesive for a folding screen and a preparation method of the OCA optical adhesive. The OCA optical adhesive for the folding screen is prepared from the following raw materials in parts by weight: 60 to 80 parts of urethane acrylate, 15 to 25 parts of organic silicon grafted glycidyl ether, 20 to 30 parts of a diluent, 5 to 10 parts of a photoinitiator and 1 to 2 parts of an antioxidant, the organic silicon grafted glycidyl ether is prepared by reacting vinyl siloxane, pentaerythritol triallyl ether, allyl glycidyl ether and a catalyst. The OCA optical cement for the folding screen prepared by the invention is applied to the folding screen, and can keep relatively good elasticity, bending resistance and bonding strength in the long-term repeated folding use process, and wrinkles and bubbles are not easy to appear.

The invention belongs to the field of preparation of non-isocyanate polyurethane, and particularly relates to a preparation method of an extreme-environment-resistant non-isocyanate polyurethane adhesive, which comprises the following steps: preparing a cyclic carbonate monomer containing a rigid structure, selecting the type of di / polyamine, and adjusting the ratio of a flexible chain segment amine compound to a rigid amine compound, thereby obtaining the extreme-environment-resistant non-isocyanate polyurethane adhesive. A series of non-isocyanate polyurethane adhesives with excellent mechanical properties are prepared, and controllability of bonding strength and extreme environment resistance is realized. The adhesive disclosed by the invention is simple in synthesis method, reaction conditions are easy to control, and the lap joint shear strength of bonded Al can reach 16.7 MPa; the lap joint shear strength at the low temperature of-196 DEG C reaches 15.6 MPa; and the overlapping shear strength at the high temperature of 190 DEG C reaches 15.2 MPa. After a bonded sample is soaked in a solvent for 24 h, the lap shear strength can still be maintained at 15.4 MPa or above and can reach 16.5 MPa, and the adhesive can be widely applied to the fields of aerospace, medical instruments, chemical product packaging and the like and has good market prospects.

The invention discloses a low-density low-viscosity polyurethane pouring sealant containing plastic microspheres and a preparation method thereof. The pouring sealant comprises a component A and a component B, the component A comprises the following components in parts by weight: 25-40 parts of castor oil polyol and 9-24 parts of modified castor oil polyol containing a benzene ring structure; 15 to 22 parts of polyester polyol; 10 to 17 parts of plastic microspheres; 12-16 parts of a liquid flame retardant; 0.2 to 0.3 part of an amine catalyst; 0.3 to 0.4 part of a metal catalyst; 0.1 to 0.4 part of a coupling agent; 0.1 to 0.4 part of a defoaming agent; 2-6 parts of a dewatering agent; wherein the ester polyol is Zibo charge beauty CM-1830 polyester polyol. The two-component polyurethane pouring sealant with low viscosity, low density and better mechanical property is prepared by selecting the polyester polyol in the component A and selecting and proportioning other components.

The invention relates to the technical field of adhesives, and discloses an antibacterial mildew-proof water-based adhesive and a preparation method thereof. The preparation method of the antibacterial and mildew-proof water-based adhesive comprises the following steps: reacting 2, 2-dimethylolpropionic acid with castor oil to obtain hyperbranched bio-based polyol; modifying the hyperbranched bio-based polyol by using a modifier to obtain modified bio-based polyol; the preparation method comprises the following steps: preparing a waterborne polyurethane dispersion liquid by taking modified bio-based polyol, a hybrid modified BN / MOF composite material and hexamethylene diisocyanate as raw materials and 1, 4-butanediol as a chain extender; the preparation method comprises the following steps: mixing a waterborne polyurethane dispersion liquid, a wetting agent, a defoaming agent, a thickening agent and water to obtain a component A; an aliphatic curing agent is used as a component B; during use, the component A and the component B are mixed and stirred. The antibacterial and mildewproof water-based adhesive disclosed by the invention has excellent adhesion performance, water resistance, self-repairing performance and lasting antibacterial and mildewproof performance.

The invention discloses a high-quality formed ginkgo wood furniture manufacturing and processing technology, and relates to the technical field of furniture production, and the high-quality formed ginkgo wood furniture manufacturing and processing technology comprises ginkgo wood selection, ginkgo wood treatment, wood modification, part processing and surface treatment. Before drying, the cut ginkgo biloba boards are subjected to primary treatment, surface impurities are removed, and primary balance treatment is carried out, so that stress concentration in the later drying process is reduced; primarily drying the primarily treated wood, adjusting the thickness and the drying temperature and humidity of the wood, adjusting the temperature in the drying chamber according to the thickness and the initial water content of the wood by using a combined drying technology, and controlling the distance between the wood to be 1 / 10-1 / 8 of the width of the wood through a circulating air drying system. By means of the combined drying technology, dynamic control over the ginkgo wood drying quality is achieved, the problems that the drying process is complex and wood is prone to warping or cracking during drying are solved, the drying period is shortened, wood deformation and cracking are reduced, the physical performance of the wood is improved, and the drying efficiency is improved.

The invention relates to the technical field of automobile tires, and discloses a new energy automobile tire self-repairing sealing material adhered with mute cotton. The preparation method comprises the following steps: adding a modified polyurethane adhesive, C5 petroleum resin and a modified carbon nanotube filler into absolute ethyl alcohol, mixing to obtain a self-repairing liquid, adhering polyurethane cotton to the upper part of the self-repairing liquid, and drying to obtain the new energy automobile tire self-repairing sealing material adhered with the mute cotton. Disulfide bonds, boric acid ester bonds and imine bonds introduced into polyurethane through a chain extension reaction and diselenide bonds introduced into carbon nanotubes all belong to dynamic covalent bonds, so that the self-repairing performance of the material is improved; by introducing a rigid benzene ring and naphthyl aromatic structure, the mechanical property of the self-repairing sealing material is improved; the carbon nano tube can play a role in skeleton supporting in a polyurethane matrix, and the mechanical property of the material is further improved by introducing an adamantane rigid structure into the carbon nano tube.

To provide polycarbonate diol which, in the case where polycarbonate diol is used as a polyurethane raw material containing a structural unit derived from straight-chain aliphatic diol having a carbon number 2 to 20 such as 1,6-hexanediol, has excellent mechanical characteristics of obtained polyurethane, suppressed variation of the mechanical characteristics from the viewpoint of quality uniformity, and furthermore excellently maintained chemical resistance.SOLUTION: Polycarbonate diol contains a structural unit (1) expressed by the following general formula (I) and a structural unit (2) expressed by general formula (II). -R-O-C(=O)-O- (I) (in general formula (I), R denotes a hydrocarbon group with a carbon number 2 to 20 which may have substituent or hetero atom.) -(CH2)m-N(R2)-C(=O)-O- (II) (in general formula (II), m is an integer of 2 to 20. R2 denotes an alkyl group or hydrogen atom with a carbon number 1 to 20 which may have substituent.)SELECTED DRAWING: None

The invention relates to the technical field of polyurethane adhesives, in particular to a quick-curing two-component hot-pressing adhesive as well as a preparation method and application thereof. Comprising a component A and a component B. The component A comprises, by weight, 20 to 60 parts of castor oil polyol, 40 to 80 parts of a filling material, 0.001 to 0.01 part of a catalyst and 0.001 to 0.006 part of an auxiliary agent, and the catalyst comprises a triethylene diamine-terminated heat-sensitive catalyst; and the component B comprises an isocyanate curing agent. The filler comprises heavy calcium carbonate and calcium oxide, and the weight ratio of the heavy calcium carbonate to the calcium oxide is (25-40): 1, so that not only can the cost be effectively reduced, but also the tensile-shear strength of the hot-pressing adhesive can be improved; and when the particle size of the filler is adjusted to be 500-2000 meshes, the tensile-shear strength after cementing can be effectively maintained within a relatively low curing time (3-5 minutes), and meanwhile, the storage stability of the sizing material is improved.

The invention relates to the technical field of new materials, and mainly relates to a double-component low-viscosity ultralow-temperature adhesive as well as a preparation method and a use method thereof. The double-component low-viscosity ultralow-temperature adhesive comprises a component A and a component B. The component A comprises the following components in percentage by mass: 20-40% of bisphenol A epoxy resin, 4-8% of aromatic epoxy resin, 6-10% of polyurethane modified epoxy resin, 1-2% of a rubber toughening agent, 5-20% of a diluent and the balance of an additive. And the component B comprises the following components in percentage by mass: 10-40% of a polyether amine curing agent, 10-40% of a fatty amine curing agent, 10-40% of an aromatic amine curing agent and 10-40% of a phenolic aldehyde amine curing agent. The adhesive provided by the invention has relatively strong compressive strength and excellent toughness, can keep good toughness in a low-temperature environment, is not easy to cause brittle rupture, can bear relatively large mechanical load, and is suitable for various industrial applications.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a self-repairing type lithium ion battery positive electrode adhesive, a preparation method, positive electrode slurry and a positive electrode plate. The adhesive comprises a mixed solvent, and a first copolymer serving as a main component and a second copolymer serving as a cross-linking agent are dissolved in the mixed solvent; the first copolymer is an acrylate-based multipolymer containing carboxyl or hydroxyl; the second copolymer is isocyanate terminated UPy functional polyurethane; the adhesive is in a liquid state at room temperature, when the adhesive is subjected to vacuum heat treatment at 60-180 DEG C, carboxyl or hydroxyl in main components of the adhesive reacts with isocyanate groups of a cross-linking agent to form amido bonds along with volatilization of a mixed solvent, and UPy groups are associated through quadruple hydrogen bonds to form dual dynamic cross-linking points. The method can effectively adapt to the volume change of the positive electrode material in the lithium removal / insertion process, and maintains the integrity of the electrode structure, thereby improving the cycling stability and rate capability of the lithium ion battery.

The invention relates to a bio-based toughening agent, an epoxy adhesive and a preparation method of the bio-based toughening agent. The bio-based toughening agent is obtained through a reaction of a polyurethane prepolymer and cardanol; the polyurethane prepolymer is obtained by reaction of castor oil and polyisocyanate; the molar ratio of an isocyanate group in the polyurethane prepolymer to a phenolic hydroxyl group in the cardanol is 1: (1-2); the molar ratio of hydroxyl groups in the castor oil to isocyanate groups in the polyisocyanate is 1: (1-3). The prepared toughening agent is applied to the epoxy adhesive, and the prepared epoxy adhesive has high peel strength and impact absorption capacity and good anti-aging capacity.

The invention discloses a high-refractive-index nano-composite optical adhesive and a preparation method thereof, and belongs to the technical field of optical transparent adhesives. The optical adhesive is prepared by taking a polyurethane acrylate oligomer with a specific structure as matrix resin, introducing surface-modified barium titanate and zirconium oxide core-shell nanoparticles as a functional filler, and matching with an active diluent, a photoinitiator and a silane coupling agent in a specific proportion. Through the design of the core-shell structure, the core problems that the high-refractive-index nanoparticles are easy to agglomerate in an organic resin matrix, the dispersion stability is poor and the bonding force with a matrix interface is weak are effectively solved. The prepared optical adhesive has a refractive index of more than 1.65, a light transmittance of more than 99% and a haze of less than 0.3% after being cured, has excellent bonding strength, weather resistance and long-term use stability, and is especially suitable for precise lamination of high-end display devices (such as OLEDs (Organic Light Emitting Diodes) and micro-lens arrays).

The invention belongs to the technical field of polyurethane pouring sealants, and particularly relates to a hydrolysis-resistant heat-conducting polyurethane pouring sealant and a preparation method thereof. The hydrolysis-resistant heat-conducting polyurethane pouring sealant is prepared from a component A and a component B according to the mass ratio of 100: (18.5-20.5), and the component A comprises the following raw materials: amine ether polyol, modified castor oil, a flame retardant, a heat-conducting filler, a silane coupling agent and a catalyst; the component B is prepared from the following raw materials: polymerized MDI (Diphenyl Diisocyanate), MDI-50 and carbodiimide modified MDI; the amine ether polyol is prepared by carrying out a reaction on 3, 3 '-dimethyl-4, 4'-diaminodiphenylmethane and epoxypropane. The hydrolysis-resistant heat-conducting polyurethane pouring sealant disclosed by the invention not only has good technological operation performance and heat-conducting performance, but also has excellent hydrolysis resistance, and still has good mechanical property and electrical insulation property after being aged; the invention also provides a scientific, reasonable, simple and feasible preparation method.

The invention relates to the technical field of high polymer material chemistry, and discloses a high and low temperature resistant anti-yellowing optical adhesive and a preparation process thereof, the high and low temperature resistant anti-yellowing optical adhesive comprises the following components by weight: 40-60% of modified organic silicon resin, 20-30% of urethane acrylate, 10-15% of alicyclic epoxy resin, 0.5-5% of a nano inorganic filler, 0.8-2.5% of an anti-yellowing composite reagent, and the balance of a solvent. The coating is prepared from the following components in percentage by weight: 0.5 to 1.5 percent of 2-hydroxy-2-methyl-1-phenyl-1-acetone, 0.1 to 0.3 percent of fluorine modified polyacrylate flatting agent and 0.3 to 1.0 percent of chloroplatinic acid-divinyl tetramethyl disiloxane complex catalyst. The preparation method comprises the following steps: mixing alpha, omega-dihydroxy polydimethylsiloxane and phenyltrimethoxysilane according to a mass ratio of 8: 2-7: 3, adding 0.3-1.0% of a chloroplatinic acid-divinyl tetramethyl disiloxane complex catalyst, and raising the temperature by stages under the protection of nitrogen, so that the glass transition temperature of the adhesive can reach 120 DEG C below zero and 125 DEG C, and the temperature of the adhesive can reach 120 DEG C below zero and 125 DEG C below zero. And the long-term service requirement of the optical device in an extreme temperature environment is met.

The invention relates to the technical field of optical protective materials, in particular to an anti-dazzle full-ultraviolet-proof optical protective material and a preparation method thereof.The anti-dazzle full-ultraviolet-proof optical protective material is formed by sequentially compounding a scratch-resistant hardened layer, a PET film layer a, a composite adhesive layer, a PET film layer b, an installation adhesive layer and a PET release film layer from top to bottom; the preparation method comprises the following steps: mixing organic silicon modified polyurethane acrylate, a pigment, a reactive diluent, a flatting agent, a photoinitiator, a solvent and modified nano silicon dioxide to prepare a photocurable scratch-resistant hardening coating liquid; in order to endow the optical material with excellent infrared barrier property and heat insulation property, cesium tungsten bronze is introduced into a composite adhesive layer as a filler, and in order to improve the adhesive power and water resistance of a composite adhesive solution, epoxy resin is taken as a base material, organic silicon modified polyurethane acrylate is introduced as a water-resistant component, acrylic acid is taken as tackifying resin, and a curing agent is taken as a curing agent. And bisphenol A ethoxylate dimethacrylate is used as a diluent.

The invention belongs to the technical field of sealants, and particularly relates to acrylate modified MS resin as well as a preparation method and application thereof in an MS sealant. The acrylate modified MS resin disclosed by the invention has the following structural formula: # imgabs0 #. The preparation method of the acrylate modified MS resin comprises the following steps: (1) mixing diisocyanate and acrylate for reaction to obtain a prepolymer; and (2) mixing polyether polyol, isocyanate silane, the prepolymer and a catalyst for reaction to obtain the acrylate modified MS resin. The prepared acrylate modified MS resin is used for preparing an MS sealant. The preparation method of the acrylate modified MS resin provided by the invention is simple in process, mild in reaction condition and convenient in production conversion, and the prepared acrylate modified MS resin is applied to an MS sealant, so that the base material adhesive force, weather resistance and mechanical properties of the MS sealant are improved.

The invention relates to composite resin for packaging a Topcon component as well as a preparation method and application of the composite resin. Comprising an acrylate monomer, an aliphatic polyurethane acrylate oligomer, hydroxyl acrylate, bisphenol A acrylate, maleic anhydride modified epoxy acrylate, a light curing agent, a latent curing agent, a flame retardant A, a flame retardant B, a thixotropic agent, an anti-aging agent, a UV absorbent and a light stabilizer. The composite resin has the comprehensive performance of high viscosity, low shrinkage, super weather resistance and flame retardance, the aluminum-containing backboard prepared from the composite resin is high in water resistance and super weather resistance, due to the fact that light-heat double-stage curing is adopted for curing, the resin collapses and is cured to generate a solid phase, and in the follow-up aluminum foil hot-pressing curing process, the solid phase is solidified to form a solid phase; the resin is further infiltrated and cured, the porosity of the resin can be greatly reduced through a dual-curing system, water cannot enter the interior in the long-term use process, and voltage breakdown reduction of the aluminum-containing back plate under the long-term damp and hot condition is completely eradicated.

The embodiment of the invention provides a UV (ultraviolet) thermal dual-curing adhesive and a preparation method thereof. The UV thermal dual-curing adhesive comprises the following components in percentage by mass: 30-55% of a photocuring prepolymer; 5%-25% of an active diluent monomer; 1%-10% of a photoinitiator; 1%-20% of a thermal initiator; 10%-40% of a filler; 0.5%-5% of a coupling agent; 1%-10% of a thixotropic agent; 1%-10% of pigment; 2%-8% of an auxiliary agent; wherein the photocuring prepolymer comprises epoxy resin. According to the UV thermal dual-curing adhesive and the preparation method thereof provided by the embodiment of the invention, the dual-curing adhesive with low shrinkage and low thermal expansion coefficient is obtained by optimizing the structure of the photocuring prepolymer and matching the components, and the prepared adhesive can be rapidly cured under the irradiation of LED 365nm ultraviolet light, or can be thermally cured under the low-temperature condition of 80 DEG C, so that the UV thermal dual-curing adhesive can be widely applied to the field of ultraviolet curing. The product can resist high and low temperature cycle impact of-50 DEG C to 140 DEG C, and has a good application prospect.

The invention provides a leather product and a method for manufacturing the leather product. The leather article comprises a substrate and a coating comprising a cellulose derivative with improved color fastness to rubbing, the cellulose derivative may be methylcellulose, ethylcellulose, ethylmethylcellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxyethyl methylcellulose, hydroxypropyl methylcellulose, carboxymethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose, carboxymethyl cellulose, or carboxymethyl cellulose. The cellulose acetate-cellulose acetate composite material is prepared from ethyl hydroxyethyl cellulose, cellulose acetate, cellulose triacetate, cellulose propionate, cellulose acetate propionate, cellulose acetate butyrate, microcrystalline cellulose, cellulose nitrate or cellulose sulfate.

The invention relates to the technical field of polyurethane synthesis, and discloses a polyurethane prepolymer and composition based on supramolecular weaving crosslinking and a preparation method of the polyurethane prepolymer, and a cross-linking agent in the polyurethane prepolymer comprises a compound as shown in a formula I and organic copper salt; the molar ratio of the compound as shown in the formula I to the organic copper salt is 1: (1.8-3); the organic copper salt is selected from copper tetraacetonitrile tetrafluoroborate and / or copper tetraacetonitrile hexafluorophosphate. According to the invention, the dynamic nature of a mechanical interlocking supramolecular structure is utilized, and a polymer with a topological structure is woven through an ectopic ring-opening polymerization strategy. The woven polymer can be used as a cross-linking agent of a polyurethane composition, can endow the polyurethane composition with relatively high mechanical property and good tensile property at the same time, and greatly improves the tensile toughness of polyurethane. # imgabs0 #

To provide: an adhesive composition which has excellent low viscosity when adjusted to a predetermined non-volatile content, and which, when used in an adhesive sheet, exhibits excellent releasability and is less likely to cause lifting or peeling from an adherend even after exposure to a high-temperature environment or a high-temperature and high-humidity environment; and an adhesive sheet employing the same.SOLUTION: An adhesive composition comprises an acrylic polymer (A) and a curing agent (B). The acrylic polymer (A) is a copolymer of a monomer mixture containing respective specific amounts of specific monomers (a1) and (a2). The amount of the curing agent (B) added is 0.01-5 pts.mass based on 100 pts.mass of the acrylic polymer (A). The gel fraction of an adhesive layer composed of the adhesive composition is 55-90%.SELECTED DRAWING: Figure 1

The organosilicon-polyurethane foam encapsulating material is composed of a component A and a component B. The component A comprises sucrose initial polyether polyol, sorbitol initial polyether polyol, a water-containing alcohol amine foaming agent, a catalyst and a halogen-free flame retardant, and the component B comprises an NCO-terminated polysiloxane-polyurethane prepolymer, silicone oil and a diluent. Wherein the water-containing alcohol amine foaming agent comprises isopropyl alcohol di-sec-butyl alcohol amine, a mixture of isopropyl alcohol sec-butyl alcohol amine and water. The two-component encapsulating material is used for encapsulating a new energy battery module.

The invention relates to a two-component polyurethane elastic structural adhesive suitable for bonding a plastic base material of an automobile spoiler. The two-component polyurethane elastic structural adhesive consists of a component A and a component B in a volume ratio of (0.8-1.2): 1, the component A comprises 10-30 parts by weight of liquid polybutadiene polyol; 10 to 30 parts by weight of polyester polyol; 1-10 parts by weight of modified castor oil polyol; 1-10 parts by weight of a chain extender; 20-40 parts by weight of a filler; 1-10 parts by weight of a molecular sieve; 1-5 parts by weight of white carbon black; 0.2 to 2 parts by weight of a tackifier; the component B comprises the following components in parts by weight: 20-40 parts of isocyanate; 20 to 40 parts by weight of liquid polybutadiene polyol; 10-20 parts by weight of a plasticizer; 20-40 parts by weight of a filler; 1-5 parts by weight of white carbon black; 0.2 to 2 parts by weight of an anti-aging agent; 0.2 to 2 parts by weight of a water absorbent; and 0.2 to 2 parts by weight of carbon black. The two-component polyurethane elastic structural adhesive provided by the invention has low hardness and high elongation at break, can realize high adhesive force when SMC / PP and other base materials are only subjected to surface flame treatment, has a bonding failure mode of cohesive failure, and is especially suitable for bonding of automobile spoiler plastic base materials.

The invention discloses an adhesive containing epoxy-terminated polyurethane epoxy resin as well as a preparation method and application of the adhesive. The adhesive comprises the following components in parts by weight: 10-15 parts of epoxy resin, 70-75 parts of epoxy-terminated polyurethane epoxy resin, 19-21 parts of an amine curing agent and 8-15 parts of heat-conducting filler, wherein the epoxy-terminated polyurethane epoxy resin is obtained by reacting a polyurethane prepolymer and epoxy resin, NCO of the polyurethane prepolymer and hydroxyl of the epoxy resin are subjected to an addition reaction, and after the reaction is finished, NCO of a system is eliminated by adopting a small-molecule epoxy compound; the polyurethane prepolymer is obtained by reaction of isocyanate and polyether polyol with flexible chain segments. According to the adhesive, the curing heat release peak value is reduced, the toughness is improved, meanwhile, the high strength is kept, the foaming problem is avoided, the defects that a traditional epoxy adhesive is high in heat release and poor in toughness are overcome, and the adhesive is suitable for the fields such as aerospace and electronic and electric appliances which have strict performance requirements.