15 results about "Ethylene glycol ester" patented technology

The present application provides a plasticizer composition which does not color the obtained molded body and has excellent plasticizing properties. Specifically, a plasticizer composition consisting of diethylene glycol dibenzoate and 1,2-propanediol dibenzoate, the mass ratio of the diethylene glycol dibenzoate to the 1,2-propanediol dibenzoate being in the range of diethylene glycol dibenzoate:1,2-propanediol dibenzoate = 50:50 to 80:20.

This invention provides a continuous method for preparing vitamin E succinate polyethylene glycol ester (TPGS). It uses a strongly acidic cation exchange resin (such as the Amberlyst series) or a perfluorosulfonic acid resin (such as the Nafion series) as a heterogeneous catalyst, which is packed in a fixed bed to catalyze the esterification reaction between vitamin E succinate and polyethylene glycol. This method achieves precise proportioning of reactants, instantaneous mixing, isothermal reaction, and online dehydration, reducing the reaction time from several hours required by existing batch methods to tens of minutes. It allows for long-term stable use, requires no complex post-processing, and produces products with high yield, good purity, and light color. The preparation method of this invention solves the problems of difficult catalyst recovery, excessive waste, low efficiency, and unstable product quality in existing methods, making it particularly suitable for large-scale, continuous, and green production of TPGS.

The application discloses a diamond polishing liquid for optical lenses and a preparation method thereof, and relates to the technical field of polishing materials.The application comprises the following raw materials in mass parts: deionized water 93.3-116.6 parts, diamond micro powder 4-5 parts, sodium polyacrylate 1.5-1.9 parts, a surfactant 0.3-0.4 parts, a synergist 0.5-0.6 parts, and a zwitterionic copolymer 0.2-0.25 parts; the synergist is poly(acrylic acid-co-hydroxyethyl acrylate)-b-poly(N-vinylbenzyl benzotriazole) block copolymer; and the zwitterionic copolymer is a sulfobetaine methacrylate-polyethylene glycol methacrylate copolymer.The introduction of the synergist, the zwitterionic copolymer and the like effectively improves the material adaptation range, the material removal rate, the low residual property and the stability of the diamond polishing liquid.Therefore, the application has a more extensive application prospect.

This invention discloses a bio-based high-efficiency antibacterial polyester fiber and its preparation method, belonging to the field of synthetic fiber technology. It solves the problems of high hue, low bio-based content, and weak antibacterial performance in existing technologies. The fiber is copolymerized from a first, second, third, and fourth ester. The first ester is formed by esterification of oxalic acid and 1,3-propanediol; the second ester is formed by esterification of an aliphatic diacid and 1,3-propanediol; the third ester is formed by esterification of a quaternary ammonium salt of hydroxy fatty acids; and the fourth ester is formed by esterification of terephthalic acid and ethylene glycol. This invention uses oxalic acid, aliphatic diacids, 1,3-propanediol, and quaternary ammonium salts of hydroxy fatty acids to prepare polyester fibers, achieving a bio-based carbon content of over 30%. The entire preparation process eliminates the need for diethylene glycol dimethyl ether, a solvent required in existing technologies, thus solving the problem of high hue caused by solvent residue. The fiber maintains highly efficient and long-lasting broad-spectrum antibacterial properties, with an antibacterial rate exceeding 99%.

The application provides an ion exchange resin and a preparation method thereof. The preparation method of the ion exchange resin comprises the following steps: performing a polymerization reaction on a mixed system comprising a support material, an acrylate monomer, a crosslinking agent and an initiator to obtain a composite microsphere; performing a chloromethylation reaction on the composite microsphere, a second solvent and a chloromethylation reagent to obtain a composite chloromicrosphere; and performing an amination reaction or a sulfonation reaction on the composite chloromicrosphere to obtain the ion exchange resin. The ion exchange resin prepared by the preparation method has the advantages of high mechanical strength and strong adsorption capacity. When the ion exchange resin is applied to the purification of a crude terephthalic acid diethylene glycol ester, the ion exchange resin can be stably operated in a water system, the generation of a hydrolysis byproduct is reduced, the product purity is significantly improved, and the industrial purification of waste polyester alcoholysis products is effectively supported.

Through a transesterification reaction in which a predetermined amount of bis(2-hydroxyethyl)terephthalate relative to glycol is fed in a divided or continuous manner, bis(glycol)terephthalate with a low residual amount of an ethylene glycol derivative is prepared, and polyester engineering products or biodegradable polyester products with high crystallinity can be produced therefrom.

This invention provides a modified activated carbon and its preparation method. The modified activated carbon has oxygen-containing functional groups on its surface, a porous structure, and a specific surface area of ​​1000 m². 2 / g~1600 m 2 / g, total pore volume is 0.65 cm³ 3 / g~0.95 cm 3 / g. The modified activated carbon provided by this invention can significantly improve the adsorption selectivity and adsorption capacity of activated carbon through the synergistic effect of porous structure, oxygen-containing functional groups, and specific specific surface area and total pore volume, while taking into account excellent decolorization effect and good regeneration performance. When applied to the decolorization process of diethylene terephthalate, a product of polyester raw material alcoholysis, it helps to improve the recovery rate of diethylene terephthalate and makes it easier to control the loss rate of diethylene terephthalate at a low level.

The object of the present invention is to provide a polyester that can be manufactured from biomass-derived raw materials and has excellent heat resistance, gas barrier properties, and blow moldability, a polyester composition containing the same, and a bottle using the same that has excellent heat resistance, gas barrier properties, and impact resistance. [Solution] A polyethylene furanoate having an intrinsic viscosity of 0.95 dl / g or more and 1.50 dl / g or less. However, the intrinsic viscosity is measured at 30°C using an Ubbelohde viscometer after dissolving 0.25 g of the polyethylene furanoate in 50 ml of a mixed solvent of phenol / 1,1,2,2-tetrachloroethane = 50 / 50 (weight ratio) (Huggins constant is assumed to be 0.32).

The application provides a preparation method of co-production of 3-hydroxypropionic acid methyl ester and terephthalic acid dimethyl ester, comprising the following steps: S1, carrying out halogenation reaction on a first material containing terephthalic acid ethylene glycol ester, a halogen-containing compound and an acidic catalyst to obtain halogenated terephthalic acid ethylene glycol ester; S2, carrying out a first reaction on a second material containing the halogenated terephthalic acid ethylene glycol ester, a cobalt catalyst, a ligand and an alkaline additive in the presence of carbon monoxide to obtain 3-hydroxypropionic acid methyl ester and terephthalic acid dimethyl ester. The application can realize high-value conversion of terephthalic acid ethylene glycol ester, and simultaneously efficiently co-produce 3-hydroxypropionic acid methyl ester and terephthalic acid dimethyl ester.

This polyethylene furanoate has an intrinsic viscosity of 0.95-1.50 dl / g. Said intrinsic viscosity is measured (the Huggins constant is defined as 0.32) at 30°C by using a Ubbelohde viscometer, after dissolving 0.25 g of the polyethylene furanoate in 50 ml of a solvent mixture of phenol / 1,1,2,2-tetrachloroethane=50 / 50 (weight ratio).

This invention discloses a method for preparing high molecular weight poly(oxalic acid) glycol ester, belonging to the technical field of biodegradable polyester materials. The method includes: mixing a natural mineral carrier with ethylene glycol at a mass ratio of 1:0.8 to 1:1.2 to form dispersed particles with a particle size of 100-500 μm and a porosity of 30%-70%; adding oxalic acid and 0.2%-2% (by mass) of catalyst at a molar ratio of oxalic acid to ethylene glycol of 1:1 to 1:1.2; esterifying at 60-100 °C under normal pressure for 2-8 h; collecting the intermediate solution after filtration to separate the carrier; and obtaining the number-average molecular weight polymer by dehydration at 120-160 °C and vacuum polycondensation at 170-200 °C and below 200 Pa for 4-12 h. M n The product yields PEO with a strength greater than 80 kDa. The preferred support is natural minerals such as kaolin, and the preferred catalyst is tetraisobutyl titanate. This invention utilizes a carrier-based slow-release mechanism to suppress side reactions. The process is simple, low-cost, and the carrier is recyclable. The product exhibits excellent performance and is suitable for industrial production.

This invention provides a catalyst for the alcoholysis of waste PET, its preparation method, and its application, relating to the field of polymer material recycling technology. The catalyst is prepared in situ from a raw material comprising a zinc source, urea, and at least one auxiliary metal salt. The zinc source is a soluble zinc salt, and the metal element in the auxiliary metal salt is selected from one or more of Mg, Mn, Al, Co, and Na. This catalyst, through the synergistic effect of the urea ligand and the Zn-based active center, effectively promotes the complete cleavage of the PET molecular chain via coordination activation and acid-base synergistic mechanisms. Simultaneously, the introduction of a specific auxiliary metal optimizes the distribution of Lewis acidic sites, improving the selectivity of the target product, diethylene phthalate (DPET). The catalyst system of this application is homogeneous and transparent, exhibits good mass transfer performance, requires no neutralization treatment after the reaction, does not produce saline wastewater, leaves no toxic residues, and is environmentally friendly, making it suitable for the green and efficient chemical recycling of waste PET.

The application provides a preparation method of a fertilizer slow-release coating agent prepared from castor oil. The method comprises the following steps: mixing castor oil and a catalyst sodium hydroxide and heating to 240 DEG C, and performing intramolecular dehydration under vacuum to obtain dehydrated castor oil; mixing the dehydrated castor oil with polyethylene glycol and an acid catalyst to perform ester exchange reaction and obtain dehydrated castor oil polyethylene glycol ester; and finally performing polycondensation under normal pressure to obtain polymeric dehydrated castor oil polyethylene glycol ester as the fertilizer slow-release coating agent. The coating agent has adjustable film thickness, good slow-release effect, can prolong the release time of fertilizer nutrients to more than 180 days, and the release rate of nutrients within 40 days is less than 80%.

The application discloses polyester filaments and a preparation method and application thereof, and relates to the polyester textile field. The polyester filaments comprise the following components in parts by weight: 30-40 parts of purified terephthalic acid, 15-20 parts of ethylene glycol, 1.83-2.39 parts of 1,4-cyclohexane dimethanol, 0.39-0.51 parts of neopentyl glycol, 0.62-1.06 parts of 2-methyl-2-propyl-1,3-propanediol, 0.4-1.3 parts of diethylene glycol isophthalate-5-sodium sulfonate and 1.9-2.8 parts of double-end amino polyethylene glycol. The 1,4-cyclohexane dimethanol and the neopentyl glycol can effectively destroy the regularity of polyester molecular chains; the diethylene glycol isophthalate-5-sodium sulfonate and the double-end amino polyethylene glycol can significantly improve the moisture absorption and moisture conductivity; and the bulky side group of the 2-methyl-2-propyl-1,3-propanediol further destroys the regularity of the molecular chains and significantly improves the moisture absorption and moisture conductivity of the polyester fibers.

The present application belongs to the technical field of separation and purification of panax notoginseng saponins, and particularly relates to a preparation method and application of a diatomite-doped rosin-based polymer composite material. The preparation method comprises the following steps: using hydrogenated rosin glycol acrylate and methyl methacrylate to form monomers, adding a certain amount of diatomite, adding an initiator, a pore-forming agent and a solvent, and mixing to obtain an oil phase; using a polyvinyl alcohol aqueous solution as a water phase; and using a suspension polymerization method to synthesize the diatomite-doped rosin-based polymer composite material. The amount of diatomite added is 9-11% of the total mass of the hydrogenated rosin glycol acrylate, divinylbenzene and methyl methacrylate. The present application can significantly improve the equilibrium adsorption capacity and purity of the rosin-based polymer material for panax notoginseng saponins by doping. The composite material obtained by the present application is a high-efficiency and reusable biomass adsorbent, and can be used for separating and enriching panax notoginseng saponins.