11 results about "Stannous octoate" patented technology

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.

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.

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.

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 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.

This invention discloses a biodegradable mulch film plastic for agriculture and its preparation method, belonging to the technical field of agricultural mulch film materials. The preparation method includes the following steps: boron nitride-terminated isocyanate polybutylene succinate, modified polylactic acid, and stannous octoate are mixed in a weight ratio of 30-40:100:1.3-1.4, and then sequentially blended at 140-150℃ for 60-90 seconds, 160-165℃ for 50-670 seconds, and 180℃ for 30-40 seconds, followed by extrusion granulation to obtain the biodegradable mulch film plastic. This invention, through the melt blending and crosslinking of boron nitride-terminated isocyanate polybutylene succinate and modified polylactic acid, not only prepares a biodegradable mulch film plastic with high heat resistance, high mechanical strength, and good water vapor barrier properties, but also improves melt strength by reducing the melt index, which is beneficial for blown film production.

The application discloses a polyester sponge for automobile interior decoration and a preparation process thereof, and relates to the technical field of polyester sponge preparation, and comprises the following component raw materials: polyester polyol, polytetrahydrofuran ether diol, deionized water, foam stabilizer, catalyst, stannous octoate, modified ethylene glycol, modified castor oil-based epoxy ester, nano fumed silica, modified hydroxymethyl phenyl phosphinic acid ester, functional agent and toluene diisocyanate 80 / 20. In the application, the modified ethylene glycol can form a stable and uniform three-dimensional crosslinking network inside the polyester sponge, effectively improves the tensile strength, tear strength and structural stability of the sponge, reduces the compression permanent deformation rate and high-temperature dimensional shrinkage rate, makes the sponge support more balanced, and is not easy to collapse and deform during long-term use, so that the durability and form maintaining capacity of the sponge are obviously improved.

The application belongs to the technical field of polyethylene monofilament preparation, and discloses a kind of HDPE high wear-resistant monofilament.The monofilament has three-dimensional network structure formed by silane hydrolysis crosslinking, and the preparation raw materials include, by weight, 100 parts of silane grafted HDPE masterbatch, 0.5-2.0 parts of composite catalyst, 0.2-0.6 parts of wear-resistant synergist and 0.1-0.4 parts of antioxidant.The preparation raw materials of the silane grafted HDPE masterbatch include 100 parts of HDPE resin, 3-8 parts of modified silane monomer, 0.2-0.8 parts of composite initiator, 0.1-0.5 parts of hydrolysis inhibitor and 0.3-0.9 parts of dispersant.Modified silane monomer is compounded by vinyl trimethoxysilane and gamma-methacryloyloxypropyl trimethoxysilane;Composite initiator is compounded by dicumyl peroxide and benzoyl peroxide;Composite catalyst is compounded by dibutyltin dilaurate and stannous octoate;Wear-resistant synergist is compounded by nano-silicon dioxide and polytetrafluoroethylene micro powder.

The application discloses an anti-fouling and wear-resistant car paint protective film and a preparation method thereof, and belongs to the technical field of car paint protective films. Modified self-repairing microcapsules are obtained by preparing self-repairing microcapsules with flaxseed oil as a core material and high-crosslinking acrylate as a shell layer, and then grafting an epoxy group on the surface; wear-resistant composite powder is obtained by synthesizing cerium-doped zinc oxide; and anti-ultraviolet wear-resistant composite powder is obtained by dopamine self-polymerization coating; then, polycaprolactone polyol, 2,2,3,3,4,4-hexafluoro-1,5-pentanediol, 1,4-butanediol, a curing agent, isooctanoic acid stannous and ethyl acetate are mixed, and the anti-ultraviolet wear-resistant composite powder, a dispersing agent BYK-163 and the modified self-repairing microcapsules are added, so that an upper self-repairing anti-fouling and wear-resistant film is obtained after coating and curing; finally, the upper self-repairing anti-fouling and wear-resistant film is hot-pressed with an aliphatic TPU base film and an acrylic pressure-sensitive adhesive layer to obtain the anti-fouling and wear-resistant car paint protective film. The car paint protective film has the advantages of efficient self-repairing, excellent wear resistance, anti-ultraviolet performance and anti-fouling performance.