67 results about "Stannous octoate" patented technology

The invention discloses a high-temperature-resistant organic silicon elastomer with high mechanical property as well as preparation and application thereof, and belongs to the technical field of functional materials. The high-temperature-resistant organic silicon elastomer with high mechanical property is prepared from the following raw materials: hydroxyl silicone oil, white carbon black nanoparticles, a silane monomer cross-linking agent, a silane coupling agent and stannous octoate, and the catalyst also comprises cage-shaped titanium oxygen cluster molecules. According to the invention, by simultaneously using the components, the composite high-temperature-resistant organic silicon elastomer material can be provided, the thermal collapse temperature of the material is almost 500 DEG C, and the composite high-temperature-resistant organic silicon elastomer material is good in thermal stability and mechanical tensile strength and wide in application prospect.

The invention relates to a method for efficiently synthesizing a lithium difluoro bis (oxalate) phosphate solid in a continuous flow reactor, and belongs to the field of environmental protection. The method comprises the following steps: firstly, feeding a lithium hexafluorophosphate solution and a lithium oxalate solution into a static mixing module of a continuous flow reactor for mixing; then entering a reaction module of the continuous flow reactor for reaction; after the reaction is finished, the material enters a separation module of a continuous flow reactor, and after membrane separation, crude lithium difluorobisoxalato phosphate is obtained through a modified ceramic membrane adsorbent; washing the crude lithium difluoro-bis (oxalate) phosphate with absolute ethyl alcohol, and performing vacuum drying to obtain a lithium difluoro-bis (oxalate) phosphate solid; the modified ceramic membrane adsorbent is prepared from an aluminum oxide-zirconium oxide composite ceramic membrane, DMF (Dimethyl Formamide), water, isocyanate 1-trimethoxysilyl methyl ester, 3, 5-dihydroxyphenylboronic acid and stannous octoate. The lithium difluoro-bis (oxalate) phosphate prepared by the method is high in purity and high in yield, and meets the requirements of high-end lithium batteries.

The invention discloses a high-resilience anti-fouling sponge material and a preparation method thereof, belongs to the technical field of preparation of anti-fouling sponges, and aims to solve the technical problem that the resilience and thermal aging resistance of anti-fouling sponges in the prior art need to be further improved. The preparation method specifically comprises the following steps: mixing polyethylene glycol, modified polysilanediol, flexible aerogel, a polyurethane foam stabilizer, deionized water and stannous octoate to obtain mixed alcohol; modified polysilanediol and flexible aerogel are introduced to construct a multi-scale collaborative network, the integrated design of structure enhancement and body pollution resistance of the polyurethane elastomer is achieved, and different from a traditional surface coating means, according to the scheme, pollution resistance and mechanical properties are embedded in a material system, so that the structural enhancement and body pollution resistance of the polyurethane elastomer are improved, and the structural enhancement and body pollution resistance of the polyurethane elastomer are improved. Long-term stability and complex working condition adaptability are both considered, and the flexible aerogel and the organic framework form a uniformly dispersed structure, and meanwhile, the framework is supported to improve toughness and rebound resilience.

The preparation method comprises the following steps: sequentially carrying out esterification reaction and polycondensation reaction on terephthalic acid, ethylene glycol, equol or a derivative thereof in the presence of the catalyst to generate the modified polyester, wherein the catalyst is prepared by enabling antimony trioxide, stannous octoate, tetrabutyl titanate and triphenyl phosphite to react in a solvent at the temperature of 100 DEG C or above; the modified polyester prepared by the method has relatively high intrinsic viscosity and fracture tensile strength, can meet the application requirements of special high polymer materials, and solves the problem that the application of semi-biomass PET copolyester in the field of special high polymer materials is limited in the prior art.

The invention provides an inorganic silicon hybrid polyurethane primer as well as a preparation method and application thereof, and belongs to the technical field of primer. The primer provided by the invention is prepared from the following raw materials: polyester polyol, polyether polyol, trimethylolpropane, hexamethylene diisocyanate, 3-(phenylamino) propyltrimethoxysilane, ethyl acetate, xylene, an antioxidant, a light stabilizer, stannous octoate and a catalyst. An isocyanate-terminated polyurethane prepolymer is selected as a base material, a silane hybrid structure is introduced, a Si-O-Si network is formed after silane is hydrolyzed, the Si-O-Si network and Ca < 2 + > in concrete form a coordinate bond, and meanwhile, an isocyanate group reacts with water to generate a urea bond to reinforce anchoring. According to the primer disclosed by the invention, through a chemical-physical synergistic effect, the technical problem of bonding failure of a floating dust hardened layer is systematically solved, and an innovative solution is provided for long-acting sealing of a concrete joint.

The application relates to the technical field of solar energy, in particular to a self-cleaning solar photovoltaic panel and a preparation process thereof. The application adds anhydrous ethanol, ammonia water, deionized water, methyl triethoxysilane, tetraethyl orthosilicate and octadecyl trimethoxysilane to prepare silica sol. Then, tetra(2-hydroxyethoxy)silane, polypropylene glycol, toluene diisocyanate, betulin, 3,4-diamino furazan, silica sol and a catalyst stannous octoate are added to prepare a polymer. Glass, ethylene-vinyl acetate copolymer, a cell piece and ethylene-vinyl acetate copolymer are sequentially laid in layers; the laminated assembly is assembled with a frame to obtain a solar photovoltaic panel. Finally, a coating is prepared by taking the polymer as a raw material, and the coating is coated on the solar photovoltaic panel to obtain a finished product. The finished product has good hydrophobicity and antibacterial property, and therefore has a wide application prospect.

This invention belongs to the field of biomedical polymer materials technology, and relates to a method for preparing an injectable thermosensitive composite hydrogel that promotes wound healing, and its application. Polyethylene glycol monomethyl ether is used as a macromolecular initiator, and stannous octoate is used as a catalyst to initiate the bulk polymerization of six-membered cyclic carbonate monomers and their derivatives. After polymerization, coupling is performed via hexamethylene diisocyanate to obtain an amphiphilic block polymer with hydrophilic ends and an oleophilic middle. The block polymer is then dissolved in PBS at low temperature, and a certain proportion of wound-healing nanoparticles are uniformly dispersed in the polymer aqueous solution to obtain the injectable thermosensitive composite hydrogel. This composite hydrogel is a viscous liquid at room temperature and has a viscosity of 34°C. o It rapidly gels in environments above °C, meaning that after injection into the body, it can gel quickly and release nanoparticles in situ to promote wound repair. It also possesses excellent wound-healing capabilities.

The invention belongs to the field of novel functional polymer materials, and discloses a preparation method of a selenium-containing polymer material capable of fixing metal ions, and the preparation method comprises the following steps: S1, adding PTMEG into a round-bottom reaction flask filled with inert gas, and placing the round-bottom reaction flask in an oil bath pan for melting; s2, MDI, dimethylglyoxime, DSe and anhydrous N, N-dimethylacetamide are sequentially added and fully mixed; s3, stannous octoate and CuCl2 are added at the same time; s4, keeping the temperature of the oil bath pan and continuously reacting; s5, after the reaction is finished, a polymer is precipitated out, and secondary cleaning is conducted through methyl alcohol. The preparation method has the advantages that oximido is introduced into a polyurethane molecular structure to fix metal ions, meanwhile, selenium is introduced in a covalent fixation mode, and through double-site introduction of the metal ions and the selenium, the molecular structure of the polyurethane is greatly improved; the NO catalytic release rate of the material can be regulated and controlled, so that the biocompatibility and applicability of the polymer material in a blood environment are improved, and the application scene is further widened.

The invention relates to a sludge / biomass mixed drying process, and belongs to the technical field of sludge treatment. Feeding the dewatered sludge, the biomass, the furfural modified diatomite, the isocyanatopropyltriethoxysilane and the stannous octoate into a double-shaft differential mixer, and uniformly mixing; discharging the mixed material from a discharge port of the double-shaft differential mixer, conveying the mixed material to a corrosion-resistant mesh belt conveyor, and uniformly spreading the material on a mesh belt to form a material layer; a hot air drying system is started, a hot air furnace generates low-temperature hot air, and the low-temperature hot air penetrates through a material layer from bottom to top for drying after being distributed through an air duct; wet and hot waste gas generated by drying firstly enters a condensation dehumidification device to remove moisture, then enters a heat recovery device to recover heat, and finally is discharged after being purified to reach the standard; the furfural modified diatomite is prepared from diatomite, absolute ethyl alcohol, furfural and hydrochloric acid; the moisture content of dried materials is low, and the materials are free of caking, uneven drying and the like.

The utility model discloses a filtering device for stannous octoate preparation, which comprises a shell mechanism, a filtering device and a centrifugal motor, the filtering device is arranged in the shell mechanism, the centrifugal motor is arranged in the shell mechanism, and a power rod is connected with the filtering device; the filtering device comprises an outer filtering shell, an inner isolating shell, spiral material driving strips, a liquid outlet, a triangular liquid guide pipe, a quick connector and a feeding pipe, the inner isolating shell is arranged in the outer filtering shell, at least one spiral material driving strip is connected between the outer filtering shell and the inner isolating shell, the triangular liquid guide pipe is connected to the lower side faces of the spiral material driving strips, and the quick connector is connected with the triangular liquid guide pipe. A plurality of liquid outlet holes are formed in one side, close to the outer filter shell, of the triangular liquid guide pipe; the filtering device for stannous octoate preparation is simple in structure, convenient and practical, the filtering distance is prolonged through the spiral material driving strip, and meanwhile, crystalline stannous octoate can be gradually driven out, so that the purpose of discharging while filtering is achieved.

This invention discloses a bio-based toughening agent-modified isosorbide polycarbonate and its preparation method, belonging to the technical field of isosorbide polycarbonate. The method includes the following steps: synthesis of a star-shaped polyester toughening agent, synthesis of isosorbide-decanediol copolycarbonate, and reactive blending. The method for synthesizing the star-shaped polyester toughening agent involves vacuum drying pentaerythritol at 105-115°C for 0.8-1.2 hours, mixing the dried pentaerythritol with ε-caprolactone and stannous octoate under nitrogen protection, heating to 125-135°C, and stirring the reaction under nitrogen atmosphere for 10-14 hours. After the reaction, cooling to 38-42°C, adding dichloromethane to completely dissolve the product, and precipitating it with cold methanol, followed by drying to obtain the star-shaped polyester toughening agent. The modified isosorbide polycarbonate prepared by this invention exhibits high toughness while maintaining excellent transparency.

The application discloses a gel polymer electrolyte and a preparation method and application thereof. The gel polymer electrolyte comprises monomers, an initiator, a lithium salt and an organic solvent. The monomers are provided with ether oxygen functional groups and carbonyl functional groups capable of conducting Li+. The initiator is selected from one of tin triflate and stannous octoate. The total mass ratio of the initiator and the monomers is 0.1-10:90-99. The mass ratio of the organic solvent and the lithium salt is 2-5:1. The application can realize the stability of the material to lithium metal without using a free radical polymerization mode represented by azobisisobutyronitrile, and can solve the problems of chemical reactions caused by initiator products and side reactions of residual active monomers by adjusting the adding proportion among the monomers, the initiator, the lithium salt and the organic solvent.

The invention relates to a preparation method of an aluminum-doped lithium lanthanum zirconium oxide solid electrolyte, and belongs to the technical field of solid electrolyte materials. Adding lithium carbonate, lanthanum oxide, zirconium oxide, aluminum nitrate and absolute ethyl alcohol into a ball milling tank for ball milling, drying, adding the modified aluminum ion chelating agent, mixing, grinding, sieving, putting into an aluminum oxide crucible, and pre-sintering to obtain an LLZO precursor; grinding and sieving the LLZO precursor, adding a polyvinyl alcohol solution, mixing, and pressing into a wafer; and placing the wafer in an alumina crucible, and carrying out high-temperature sintering to obtain the lithium lanthanum zirconium oxide solid electrolyte doped with the aluminum element. The modified aluminum ion chelating agent is prepared from (11-mercaptoundecyl)-trimethyl ammonium bromide, methylbenzene, biphenyl-4, 4 '-dithiol, triethylamine, lanthanum nitrate and stannous octoate; the lithium lanthanum zirconium oxide solid electrolyte prepared by the invention has relatively high room-temperature ionic conductivity and excellent chemical stability and interface stability.

The invention discloses a quick-drying water-based spraying marking paint and a preparation method thereof, the paint comprises a hydroxy acrylic acid dispersion, microencapsulated stannous octoate, a tertiary amine promoter, epoxy silane modified nano SiO2, hollow glass beads, a pigment and an auxiliary agent, and the paint is prepared through a high-speed shearing dispersion technology. On the premise that the wear resistance and the luminosity of the coating are guaranteed, microencapsulated stannous octoate is applied to catalysis of an epoxy-hydroxyl reaction, crosslinking is achieved ingeniously through epoxy silane modified nanoparticles, the industrial problem that the crosslinking speed of the waterborne acrylic coating at the normal temperature is low is solved, and the waterborne acrylic coating is especially suitable for construction in the low-temperature environment. Excellent durability and environment-friendly performance are realized.

The invention belongs to the technical field of metal material preparation, and discloses a feed formula for a low-oxygen-content titanium alloy FGF (Fibroblast Growth Factor), which consists of 85-92% of titanium alloy powder and 8-15% of a multi-element binder system, the binder comprises a polylactic acid / polycaprolactone blending skeleton capable of being catalytically degraded, a wax component capable of being extracted at low temperature, a compound surfactant and a high-boiling-point plasticizer, and a supported stannous octoate catalyst is introduced. According to the invention, a multi-component binder system consisting of a catalytically degradable polymer skeleton, a wax component capable of being extracted at a low temperature, a compound surfactant and a high-boiling-point plasticizer is constructed, and a two-stage degreasing process is matched, so that the fundamental contradiction between the degreasing efficiency and the material purity in titanium alloy powder injection molding is successfully solved; and a feasible technical path is provided for large-scale manufacturing of high-reliability and high-purity titanium alloy complex components.

The invention provides a degradable plastic box material as well as a preparation method and application thereof, and belongs to the field of polyester degradable plastic compositions. The method comprises the following steps: carrying out ring-opening copolymerization reaction on a tension cyclic ester monomer, a [2] rotaxane structure monomer, an aliphatic polyester monomer and stannous octoate to obtain a polyester copolymer with a linear-cyclic alternating multi-block structure; and carrying out melt co-extrusion on the polyester copolymer, the cellulose nanocrystal, the plasticizer, the lubricant and the inorganic pigment to obtain the degradable plastic box polyester material. According to the degradable plastic box polyester material, the components of the degradable plastic box polyester material are reasonably designed, the core polyester copolymer is copolymerized into a linear-annular alternating structure through specific monomers, rigidity, toughness and damage resistance are considered, acetal bonds assist in controllable degradation, cellulose nanocrystals improve the tensile strength and deformation resistance of the material, all the components are complementary in function and synergistic in performance, and the degradable plastic box polyester material is prepared. Therefore, the mechanical property and the degradation property of the material are synchronously improved.

This invention relates to the field of polymer degradable materials technology, specifically to a biodegradable material, its preparation method, and its applications. The material is based on modified polylactic acid (PLA), supplemented by antioxidants, plasticizers, flame retardants, and inorganic fillers in specific weight proportions. Its unique feature lies in the polymerization of lactic acid and epicatechin imidazole ammonium chloride polymer under stannous octoate catalysis, using chemical bonding to introduce the bioactive groups of epicatechin into the PLA backbone, significantly improving the material's biodegradation rate, mechanical properties, and thermal stability. The bioactive substances and ionic groups in this material promote microbial degradation, achieving complete decomposition in a composting environment within a short time. Simultaneously, through molecular-level reinforcement and ionic cross-linking effects, the strength, toughness, and high-temperature processing performance of PLA are effectively improved. This material can be widely used in disposable tableware, food packaging films, and biodegradable agricultural mulch films.

The invention belongs to the technical field of high polymer materials, and particularly relates to a rubber label containing an epoxy group agglomerated siloxane microsphere emulsion and a preparation method thereof.The preparation method comprises the steps that S1, sodium dodecyl sulfate, sodium bicarbonate and sodium dihydrogen phosphate serve as raw materials to prepare a water phase, modified silane, n-hexadecane and azodiisobutyronitrile serve as raw materials to prepare an oil phase, and the oil phase is prepared into an oil phase; carrying out emulsification treatment on the water phase and the oil phase to obtain a miniemulsion, and carrying out polymerization reaction on the miniemulsion to obtain an epoxy group-containing agglomerated siloxane microsphere emulsion; s2, polyol, isocyanate, a chain extender, 1, 4-butanediol and stannous octoate are used as raw materials to prepare a prepolymer; and S3, adding the epoxy group-containing agglomerated siloxane microsphere emulsion into the prepolymer for stirring reaction, and then pouring into a mold for molding to obtain the rubber label containing the epoxy group-containing agglomerated siloxane microsphere emulsion. The hardness and heat resistance of the material are effectively improved, and good flame retardant property is obtained.

This invention relates to the field of polylactic acid (PLA) materials technology, specifically disclosing a biodegradable PLA vacuum blood collection tube and its preparation process. The preparation process includes the following steps: S1: Take lactic acid, p-hydroxyphenylpropionic acid, polycaprolactone-polyethylene glycol carboxyl group, stannous octoate, p-toluenesulfonic acid monohydrate, and modified hydroxypropionic acid to prepare polycaprolactone-polyethylene glycol carboxyl-modified PLA; S2: Take lactic acid, p-hydroxyphenylpropionic acid, carboxymethyl chitosan, stannous octoate, p-toluenesulfonic acid monohydrate, and modified hydroxypropionic acid to prepare chitosan-modified PLA; S3: Mix polycaprolactone-polyethylene glycol carboxyl-modified PLA, chitosan-modified PLA, and PLA evenly and add them to an extruder, melt-blend, extrude, and granulate to obtain PLA masterbatch; S4: Use PLA masterbatch to prepare vacuum blood collection tubes; Immerse the vacuum blood collection tubes in an antibacterial and anti-wall-attachment treatment solution, remove, wash, and dry to obtain biodegradable PLA vacuum blood collection tubes.

The invention relates to the technical field of coatings, and discloses a preparation method of an EVA (Ethylene Vinyl Acetate) waterproof coating, which comprises the following steps: reacting activated montmorillonite with toluene diisocynate to obtain isocyanate modified montmorillonite; eVA is hydrolyzed under the catalysis of potassium hydroxide to obtain hydroxylated EVA; and reacting the epoxy trisiloxane intermediate with terephthalic acid under ring-opening esterification of benzyltriethylammonium chloride to obtain the p-hydroxytrisiloxane benzoate. 4-hydroxytrisiloxane benzoate, hydroxylated EVA and isocyanate modified montmorillonite are subjected to a cross-linking reaction with toluene diisocynate under the catalysis of stannous octoate, then a defoaming agent and a dispersing agent are added into the mixture, the mixture is stirred to be uniform, and the EVA waterproof coating is obtained. The EVA waterproof coating prepared by the preparation method disclosed by the invention has relatively good mechanical property and waterproof property.

The invention discloses a waterproof fiber composite board and a preparation method thereof, and belongs to the technical field of fiber composite boards. The preparation method comprises the following steps: mixing and stirring fir wood fibers, maleic anhydride, benzoyl peroxide and N, N-dimethylaniline for reaction to obtain pretreated wood fibers; the pretreated wood fibers and phenolic resin with the solid content being 50% are mixed to obtain a wood matrix material, modified pollen, modified lotus leaf wax, stannous octoate and modified aerogel are added, and the mixture is stirred and mixed to obtain functional slurry; and pouring the functional slurry into a mold, and carrying out hot pressing treatment to obtain the waterproof fiber composite board. Chemical bonding of the modified aerogel, the pretreated wood fiber and the modified pollen is achieved through an isocyanate group, and a continuous heat preservation network is constructed to achieve the heat preservation property; phenolic resin, modified pollen and modified lotus leaf wax form double waterproof barriers, so that the problem that hydrophobic components are easy to migrate is solved; all the components have a synergistic effect, so that the product has excellent water resistance, antibacterial property, thermal insulation property, mechanical property and thermal stability.

The invention relates to the technical field of elastic materials. The degradable elastic material is prepared from the following raw materials in parts by weight: 40 to 50 parts of bio-based polyether polyol, 20 to 30 parts of polylactic acid, 6 to 10 parts of bio-based polybutylene terephthalate, 6 to 10 parts of bio-based polycaprolactone triol, 4 to 6 parts of filler, 2 to 4 parts of citric acid, 2 to 4 parts of itaconic anhydride, 0.6 to 1 part of zinc stearate, 0.4 to 0.6 part of stannous octoate and 1 to 6 parts of 1, 3-pentanediol monoisobutyrate. And 2 parts of erucyl amide. According to the invention, bacteria can metabolize, breed and secrete hydrolase, the hydrolase is fixed in the filler in the subsequent freeze-drying treatment, and when the final material is in an environment rich in microorganisms, the preloaded hydrolase can be activated and slowly released to start a hydrolysis reaction in the material, so that the breakage of a polymer chain is greatly accelerated; the degradation efficiency of the kettle material made of the degradable elastic material is effectively improved.

The invention discloses a high-bearing-capacity slow-resilience sponge and a preparation method thereof. The sponge is prepared from the following raw materials in parts by weight: 100 parts of slow rebound polyether polyol, 5 to 15 parts of ternary deep eutectic solvent, 1 to 3 parts of diethanol amine, 1.5 to 2.5 parts of deionized water, 0.3 to 0.8 part of triethylene diamine solution, 0.2 to 0.7 part of stannous octoate, 1 to 2 parts of polysiloxane-polyether block copolymer and polyphenyl polymethylene polyisocyanate, wherein the index of the polyphenyl polymethylene polyisocyanate is 105 to 115. During preparation, the component A is mixed and defoamed at a low temperature of 15-18 DEG C, and is mixed and foamed with isocyanate. And when the core temperature is raised to 45-55 DEG C through foaming heat release, the ternary deep eutectic solvent is triggered to be dissociated by heating and participate in in-situ crosslinking. By utilizing the dissociation characteristic of the deep eutectic solvent at a specific temperature, a secondary hydrogen bond network is accessed to a main chain skeleton, and the cross-linked structure increases the interaction force between macromolecular chain segments and can disperse external compression stress, so that the support coefficient of the sponge is improved, the acting force and internal friction resistance between the macromolecular chain segments are increased, and the mechanical property of the sponge is improved. The synchronous improvement of the bearing capacity and the slow rebound characteristic of the sponge is realized.

This invention discloses a method for preparing lactide, comprising the following steps: 1) Dehydration: L-lactic acid is dehydrated to a water content of less than 1 wt% to obtain a dehydrated raw material; 2) Polymerization: A catalyst and an auxiliary agent are added to the dehydrated raw material, the temperature is raised to 150-200℃, and the pressure is controlled at 5-100 hPa absolute pressure to carry out a polymerization reaction to obtain a lactic acid oligomer; 3) Depolymerization: The lactic acid oligomer is depolymerized at 200-260℃ and 5-100 hPa absolute pressure to obtain L-lactide; the catalyst is stannous octoate, and the auxiliary agent has the structural expression shown below; this invention can significantly reduce the molecular weight of the polymer at the bottom of the reactor.

The invention discloses an agricultural seed coating auxiliary agent as well as a preparation method and application thereof, and belongs to the technical field of auxiliary agents for agricultural production. The preparation method is used for solving the technical problems that in the prior art, an agricultural seed coating auxiliary agent is single in function, and the system stability needs to be further improved, and comprises the steps that poly (3, 4-dihydroxyphenethyl acrylate), butyl acrylate and stannous octoate are mixed, heated, subjected to a reaction and purified after the reaction is finished, and a segmented copolymer is obtained; mixing the block copolymer, PEGMA, a photoinitiator and tetrahydrofuran, carrying out room temperature reaction under ultraviolet light, and carrying out rotary evaporation after the reaction is ended, so as to obtain a PEGMA grafted block copolymer; mixing the PEGMA grafted block copolymer, chitosan oligosaccharide, a water-soluble organic matter, a water-retaining agent and water, and homogenizing to obtain an auxiliary agent of the agricultural seed coating agent; the prepared auxiliary agent for the agricultural seed coating agent has good film-forming performance and adhesion performance; an agricultural auxiliary agent obtained by mixing the corn seed dressing agent with pesticide raw materials and other components is used for seed dressing of corn and wheat, and the emergence rate can be increased.

The invention discloses a dental medullary cavity retention crown surface composite coating and a preparation method, and belongs to the technical field of medullary cavity retention crowns. The dental medullary cavity retention crown surface composite coating is characterized by comprising the following components in parts by weight: a moisture curing layer, a middle layer and a mineralized polypeptide layer, the moisture curing layer is prepared from 75 parts of a polyurethane prepolymer, 12 to 24 parts of modified nano hydroxyapatite, 4 parts of p-toluenesulfonyl isocyanate, 0.2 part of stannous octoate and 0.6 part of fumed silica; according to the composite coating, it is guaranteed that the medullary cavity retention crown with the root canal internal extending retention achieves high-strength bonding in the deep portion of the root canal, the stability of the bonding interface of the retention crown in long-term use is avoided through a multiple defense mechanism, the durability of the bonding effect is effectively guaranteed, and effective retention can be maintained for a longer time.

The application discloses a dental pulp cavity retention crown surface composite coating and a preparation method, and belongs to the technical field of pulp cavity retention crowns. The dental pulp cavity retention crown surface composite coating is characterized by comprising the following components in parts by weight: a moisture curing layer, an intermediate layer and a mineralized polypeptide layer. The moisture curing layer comprises the following components: 75 parts of polyurethane prepolymer, 12-24 parts of modified nano-hydroxyapatite, 4 parts of p-toluenesulfonyl isocyanate, 0.2 parts of stannous octoate and 0.6 parts of fumed silica. The composite coating guarantees that the pulp cavity retention crown with root canal extension retention can realize high-strength bonding in the deep part of the root canal, avoids the stability of the bonding interface of the retention crown in long-term use through a multiple defense mechanism, effectively guarantees the persistence of the bonding effect, and can maintain effective retention for a longer time.

The invention discloses a low-density high-resilience polyurethane foam packaging material and a preparation method thereof, and relates to a light-weight high-resilience packaging material and a preparation method thereof. The low-density high-resilience polyurethane foam packaging material is suitable for packaging instruments, equipment and the like. The foaming material is formed by foaming a prepolymer C and a composite material, the prepolymer C is prepared from isophorone diisocyanate, a modifier B, imidazolidinyl urea, isobornyl acrylate and hydroxyethyl acrylate through a reaction; the modifier B is prepared from xylene, terephthalaldehyde and ethanolamine through a reaction; the combined material D is prepared by mixing polyether polyol E and F, polyester polyol, polyethylene glycol adipate, a foam stabilizer, water, cyclopentane, triethylene diamine (33% aqueous solution), stannous octoate and a modifier A; the modifier A is prepared by mixing and reacting a water phase consisting of water, nano silicon dioxide, polyvinylpyrrolidone and sodium chloride with an oil phase consisting of a polymeric monomer, low-boiling-point saturated hydrocarbon and azodiisobutyronitrile. The high-elasticity and impact-resistant rubber material is good in buffering and impact-resistant performance and rebound resilience, low in density, light in weight and environment-friendly.

The application discloses a photo-thermal dual-curing resin based on pyromellitic dianhydride and cinnamyl alcohol, which is composed of 4-6 parts of bio-based cinnamyl alcohol, 5-9 parts of hydroxyethyl methacrylate, 4-6 parts of pyromellitic dianhydride, 4-6.5 parts of bio-based epoxy soybean oil, 0.04-0.07 parts of a first catalyst, 0.07-0.09 parts of a polymerization inhibitor, 0.1-0.2 parts of a second catalyst and 0.4-0.7 parts of a photoinitiator in terms of weight parts; the first catalyst is at least one selected from 4-dimethylaminopyridine, p-toluenesulfonic acid, triethylamine and stannous octoate; and the second catalyst is triphenylphosphine. By introducing a rigid benzene ring structure (from PMDA) and multiple photosensitive groups (acrylate double bonds and cinnamyl double bonds), the application effectively solves the problems of low mechanical strength and poor thermal stability of a cured product of pure epoxy soybean oil-based resin. The obtained resin has excellent thermal performance, mechanical strength and high bio-based content.

The application relates to the technical field of polyurethane, in particular to a polyurethane half-pipe for low-temperature pipeline heat preservation and a preparation method thereof. The polyurethane half-pipe is prepared by adding polyether polyol, flame-retardant polyol, a physical foaming agent, a chemical foaming agent, a surfactant, a catalyst, stannous octoate and polymethylene polyphenyl polyisocyanate, foaming and curing, and then coating modified flame-retardant silicone resin onto the surface of the polyurethane half-pipe and curing to obtain a finished product. The finished product prepared by the application has excellent flame-retardant performance and heat preservation performance, so that the application has a wide application prospect in the technical field of polyurethane.