37 results about "Diethyl terephthalate" patented technology

The invention belongs to the technical field of powder coatings, particularly relates to an epoxidation polyester resin and further discloses a preparation method of the epoxidation polyester resin and application of the prepared powder material. The epoxidation polyester resin is prepared by copolymerizing the raw materials of diethyl terephthalate, glutamic acid, mercaptosuccinic acid, 12-hydroxy stearic acid, dyhydroxyl-1-ethyl benzene, 2,5-dimethyl-2,5-hexanediol, neopentyl glycol, resorcinol diglycidyl ether and the like, the acid value of the finally obtained polyester resin is lower than 2 mgKOH / g, the epoxide equivalent is 800-900 g / mol, the softening point is 85-105 DEG C, the polyester resin can substitute E-12 epoxy resin and the commercially available high-acid-value carboxyl polyester (the acid value is 48-52 mgKOH / g) to cure, a coating film completely reaches the requirement of the powder coating, and the prepared powder coating is better in stability and boiling resistance.

The invention discloses a method for degrading polyethylene terephathalate. The method mainly includes the following steps: 1, strain culture: comamonas testoseroni strain is cultured for 12-18h in a solid medium with inclined surface at 30-37 DEG C; 2, substrate solution preparation: 5-9 parts of substrate solution with the concentration of 1-5g / L are prepared, each part is 50ml and is respectively placed into a 150ml conical flask, and packing up and sterilizing for 25min are carried out at 121 DEG C; 3, substrate degradation: the strain in the step 1 is inoculated into the substrate solution in the step 2, so as to obtain degradation liquor, and shake culture is carried out at the rotating speed of 200r / min and at the temperature of 30-37 DEG C, so as to catalyze degradation on the substrate; 4, substrate degradation ratio detection: 400-190nm wavelength scanning is adopted, and variation of substrate content is judged according to absorption peak at 240nm; 5, substrate degradationproduct detection: 400-190nm wavelength scanning is adopted, and variation of degradation intermediate product content is judged.

The invention discloses a preparation method of a ceramic coloration toner for a color laser printer, which relates to the ceramic coloration field. The method comprises pre-mixing diethyl terephthalate 25 parts, zirconia 70 parts, cadmium yellow 70 parts, manganese red 70 parts, cobalt ultramarine 70 parts, salicylic acid charge control agent 2 parts and polyethylene wax 2 parts according to weight percentage, and taking silica 1 part for use; extruding by using a double-screw extrusion machine, and performing coarse crushing and fine crushing on the extrudate; grading toner particles to control particle size D50 of the toner at 8.5+ / -0.5mum; and adding silica 1 part into the graded toner particles, mixing, and sieving by using a 120 mesh vibrating screen to obtain undersized product which is the ceramic coloration toner for the color laser printer. The method simplifies the process, lowers the cost, is convenient, and saves time and energy.

The invention relates to an improved resin of polyethylene glycol terephthalate with antistatic property, and the resin is prepared by ethylene glycol terephthalate and polyester ether which containsnanometer antimony and is doped with stannic oxide in the temperature between 260 DEG C to 280 DEG C, and in the vacuum between 20 Pa-100Pa, wherein, the polyester ether which contains nanometer antimony and is doped with stannic oxide is prepared by the mixture which is composed of ethylene glycol terephthalate and polyether and nanometer antimony which are doped with stannic oxide, and the massresistivity of the improved resin of the polyethylene glycol terephthalate which is got is 1*107 ohms.cm-9*109 ohms. cm. The invention solves the permanence problem of anti-static function of polyester.

The invention relates to a porous soft superfine polyester fiber and a preparation method thereof. The method comprises the following steps: spinning modified polyester by adopting a porous spinneret, so as to obtain the porous soft superfine polyester fiber. The spinneret orifices on the porous spinneret are arranged in an elliptical shape, namely the centers of the spinneret orifices are positioned on concentric ellipses, the concentric ellipses are a series of ellipses, and both long axes and short axes of all the ellipses are collinear. The porous soft superfine polyester fiber is prepared by performing metering, squeezing, cooling, oiling and high-speed winding on modified polyester chips, and the preparation method of the modified polyester comprises the steps: carrying a reaction between terephthalic acid and ethylene glycol to prepare polyethylene terephthalate, adding diethyl terephthalate obtained after the reaction between terephthalic acid and a dihydric alcohol containing branched chains, and continuously carrying out the reaction, so as to obtain the modified polyester. The fiber disclosed by the invention is excellent in performance, the linear density deviation rate is less than or equal to 0.5%, the breaking strength CV value is less than or equal to 4.0%, the breaking elongation CV value is less than or equal to 8.0%, and the yarn unevenness CV value is less than or equal to 2.0%.