11 results about "Trimethylene carbonate" patented technology

The application relates to the technical field of batteries, in particular to an electrolyte suitable for primary lithium-manganese batteries and a preparation method thereof. The electrolyte comprises propylene carbonate, ethylene carbonate, lithium bisfluorosulfonylimide, lithium perchlorate, lithium bisoxalate borate, terminal bisdifluorophosphorylated oligomeric trimethylene carbonate, ethylene glycol dimethyl ether, lithium difluorooxalate borate and 1,3-propane sultone. The electrolyte is prepared through a pre-coordination and segmented dilution process with specific timing. The electrolyte system can synergistically optimize the electrode interface film forming process, has high discharge capacity retention rate and low direct current resistance at low temperature (-20 DEG C), and has high capacity retention rate after high-temperature storage (60 DEG C), thereby significantly improving the comprehensive performance of the primary lithium-manganese battery in a wide temperature range.

The invention discloses a synthesis method of trimethylene carbonate, which comprises the following steps: sequentially adding a MO-Ce-CMNDI catalyst, 2-cyano furan, potassium carbonate and 1, 3-propylene glycol into a reaction kettle in a water-free and oxygen-free environment, introducing CO2 for reaction, and obtaining a target product after the reaction is finished. When the MO-Ce-CMNDI catalyst is used for the trimethylene carbonate synthesis reaction, the catalytic activity is high, the reusability is good, and the yield of the product is improved.

Compounds and compositions are provided which are useful in additive printing, particularly additive printing techniques such as stereolithography (SLA) wherein a macromer is photopolymerized to form a manufactured article. Representative compounds comprise a polyaxial central core (CC) and 2-4 arms of the formula (A)-(B) or (B)-(A) extending from the central core, where at least one of the arms comprise a light-reactive functional group (Q) and (A) is the free-radical polymerization product from monomers selected from trimethylene carbonate (T) and ε-caprolactone (C), while (B) is the free-radical polymerization product from monomers selected from glycolide, lactide and p-dioxanone.

The application discloses a 4D printing shape memory composite stent for delivering exosomes and magnesium ions and a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing hydroxyapatite and silicon dioxide nanoparticles with poly(D, L-lactic acid-co-trimethylene carbonate) in dichloromethane to obtain an oil phase; adding exosomes into a magnesium oxide nanoparticle water dispersion to obtain an aqueous phase; and mixing to obtain a water-in-oil Pickering emulsion; and (2) using a 4D printing technology to prepare the composite porous shape memory stent (PHS / MgO-EXO) loaded with exosomes by using the Pickering emulsion ink. The stent has a multi-stage interconnected pore structure, and can promote cell osteogenic differentiation and bone tissue regeneration by synergistically releasing exosomes and magnesium ions. The stent also has a temperature-sensitive shape memory function, can restore the original shape under a slightly higher body temperature stimulus, can accurately match irregular bone defects, and is suitable for minimally invasive repair treatment of clinical irregular bone defects.

The invention relates to an electrospun hybrid scaffold for medical applications comprising at least one synthetic polymer selected from poly(caprolactone), polylactide, poly(trimethylene carbonate), poly(lactide-co-caprolactone), poly(lactide-co-trimethylene carbonate), polylactide-b-polyethylene glycol, their copolymers or mixtures thereof and collagen-like protein. The invention also relates to methods of dispersing collagen-like protein into synthetic resorbable polymers and forming compositions suitable for electrospinning.

The invention discloses a catalyst for synthesizing cyclic carbonate and a preparation method of the catalyst. The catalyst is MO (at) Ag-HOF; wherein Ag-HOF represents a hydrogen bond organic framework material [Ag (HMCTA) (H2MCTA)] synthesized from AgNO3 and 5-methyl-1-(4-carboxyl phenyl)-1H-1, 2, 3-triazole-4-formic acid (H2MCTCA), and the chemical formula of the Ag-HOF is shown in the description. When the MO-Ag-HOF catalyst is used for cyclization synthesis of trimethylene carbonate from CO2 and 3-chloro-1-propanol, the catalytic activity is high, the reusability is good, and the yield of the product is greatly improved.

The invention relates to the technical field of medical materials, in particular to a medical closing clip composite material which comprises the following components in parts by weight: 65-75 parts of polyhydroxyalkanoate, 10-15 parts of a degradable copolymer, 4-8 parts of a compound and 2-4 parts of a nano compound, the preparation method of the compound comprises the following steps: premixing barium sulfate modified by an organic surface modifier with polylactic acid particles, and carrying out melt blending and hot press molding to obtain the compound. The organic surface modifier is N, N '-ethylene bis (phthalimide); the degradable copolymer is prepared by carrying out copolymerization reaction on glycolide, lactide and trimethylene carbonate according to the weight ratio of (3 to 4): (2 to 3): 1. Through the synergistic effect of the polyhydroxyalkanoate, the degradable copolymer, the compound and the nano-compound, a good biological dissolving effect is achieved, and meanwhile, due to the fact that the modified barium sulfate is fused into the product and the outer surface of the product is coated with the hafnium element, a good developing effect is achieved.

The invention provides a preparation method of trimethylene carbonate, which comprises the following steps: carrying out transesterification by taking dimethyl carbonate and 1, 3-propylene glycol as raw materials and sylvite as a catalyst; wherein the catalyst is selected from one or more of potassium carbonate, potassium hydroxide, potassium bicarbonate, potassium chloride, potassium nitrate and potassium sulfate; the reaction conditions are normal pressure and the reaction temperature is 90-140 DEG C. According to the preparation method provided by the invention, the potassium salt is innovatively used as the catalyst, the one-pot method is adopted for preparation under milder reaction conditions, the excellent trimethylene carbonate yield can be obtained, the catalyst is low in cost and easy to obtain, the preparation process is simple and convenient, and industrial popularization is facilitated.

The invention provides a polylactic acid composition as well as a preparation method and application thereof, and relates to the field of high polymer materials. The polylactic acid composition comprises polylactic acid and a polyester block copolymer, the general formula of the polyester block copolymer is A-B-A, and the A segment comprises a lactic acid unit; and the segment B comprises a caprolactone unit and a trimethylene carbonate unit which are arranged randomly. According to the polylactic acid composition provided by the invention, the polylactic acid is subjected to toughening modification by adopting the polyester block copolymer. A soft segment in the polyester block copolymer is a random copolymer of caprolactone and trimethylene carbonate, and introduction of trimethylene carbonate can destroy crystallization of a caprolactone polymerization chain segment, so that the soft segment is softer. The hard segment of the polyester block copolymer is polylactic acid, and the segment can improve the compatibility between the polyester block copolymer and polylactic acid. The polyester block copolymer plays a role in toughening the polylactic acid, and the polyester block copolymer also has biodegradability, so that the whole composition has biodegradability.

The invention discloses long-acting composite water-based color paste for outdoor wood. The long-acting composite water-based color paste comprises an inorganic pigment, an organic pigment, a composite dispersing agent, deionized water and other auxiliaries. Wherein the composite dispersing agent comprises a first dispersing agent and a second dispersing agent which are synthesized by trimethylene carbonate and polyether amine, and the polyether amine is synthesized by N, N-dimethylethylenediamine and 1, 4-butanediol diglycidyl; the composite dispersant has hydrophilic and hydrophobic groups at the same time, can effectively anchor pigment particles, and can well disperse the pigment particles. The preparation method of the composite water-based color paste comprises the following steps: adding the composite dispersing agent, the wetting agent and the defoaming agent into part of deionized water, and uniformly stirring; then adding an inorganic pigment and an organic pigment, uniformly stirring, and carrying out circulating ball milling; finally, the rest deionized water, the flatting agent and the anti-ultraviolet agent are added and evenly stirred, and the composite water-based color paste is obtained, has good tinting strength and stability and has good dispersity and stability when applied to various coatings.

A free-radical in-situ polymerization semi-solid-state battery includes a positive electrode, a negative electrode and a semi-solid electrolyte. The semi-solid electrolyte is formed through in-situ polymerization by adding a polymerizable monomer, a plasticizer and an initiator into a liquid electrolyte. The polymerizable monomer is a combination of vinylene carbonate (VC) and trimethylene carbonate (TMC) with a mass ratio of 20 to 35:0.1 to 1.5. By optimizing the components of the gel electrolyte, the impedance of the battery is reduced, the performance of the battery is improved, the hardness of the gel electrolyte is enhanced, the solid-solid interface in the battery is benefited, and the safety of the battery is improved.