3results about How to "Originality" patented technology

The invention belongs to the technical field of PET (polyethylene terephthalate) depolymerization catalysts, and relates to a method for generating BHET (butylated hydroxytoluene) by depolymerization based on a DBU-SiO2 catalyst, which comprises the following steps: adding waste PET and ethylene glycol into a depolymerization kettle for alcoholysis depolymerization reaction under the catalysis of an organic-inorganic hybrid nitrogen heterocyclic organic alkali loaded porous silica gel catalyst DBU-SiO2 to obtain a BHET monomer; the preparation process of the DBU-SiO2 comprises the following steps: adding silica gel into ethanol, stirring, adding 1, 8-diazacyclo [5.4. 0] undec-7-ene, carrying out heating reflux, and sequentially filtering, washing and drying to obtain the DBU-SiO2; the conversion rate of the PET polyester is 87.49 to 95.11 percent, and the yield of the BHET monomer is 76.84 to 80.03 percent. According to the method disclosed by the invention, the waste PET is depolymerized by adopting the DBU-SiO2 catalyst, so that the PET conversion rate and the BHET yield are remarkably improved.

The application provides a device and a test method for monitoring diffusion of hydrogen atoms across a grain boundary by using SKPFM, and relates to the technical field of hydrogen energy utilization. The device for monitoring diffusion of hydrogen atoms across a grain boundary by using SKPFM comprises a target grain boundary to be researched, a cantilever, an electrolytic cell, a platinum wire and a direct current power supply. The method is as follows: for a columnar crystal material after directional solidification, a certain grain boundary is determined as the research grain boundary, then a sample of the cantilever connected with the electrolytic cell is prepared, hydrogen atoms diffuse to the research grain boundary and gradually cross the grain boundary during the electrolysis process, and continuous scanning is performed on the grain boundary position by using SKPFM, so that the behavior of hydrogen crossing the grain boundary can be observed in real time. Compared with other traditional methods, the method of the application realizes the diffusion behavior of hydrogen atoms across the target grain boundary, high-throughput research and real-time monitoring research through the design of the device structure and the test method, improves the hydrogen embrittlement resistance of the material, and the conclusion is real, reliable and guaranteed, and is beneficial to industrial popularization and use.

This invention discloses a low-carbon equivalent extra-thick high-toughness normalized steel plate for offshore wind power and its manufacturing method. The steel plate is 100-150mm thick, and its chemical composition by weight percentage is C: 0.12-0.18%, Si: 0.20-0.40%, Mn: 1.20-1.60%, P≤0.020%, S≤0.005%, combined with trace amounts of Ni, Mo, and Cr tempering and Nb+V+Ti ternary composite microalloying, with strict control of B≤0.0005% and carbon equivalent CEV≤0.43%. The steel plate has a yield strength ≥355MPa, tensile strength 470-560MPa, and a single Charpy impact energy of -50℃ in both transverse and longitudinal directions ≥50J. The manufacturing method includes smelting and casting, heating of continuously cast billets, rolling, and normalizing heat treatment. The rolling compression ratio is ≥3.0, the reduction rate of the last three passes of rough rolling is >9%, the finishing rolling temperature is 780-820℃, the normalizing temperature is 870-900℃, and the holding time coefficient is 1.5-2.5 min / mm. This invention solves the problems of insufficient strength and toughness and uneven thickness properties of extra-thick plates with low carbon equivalent. It has good weldability, low production cost, and is suitable for offshore wind power monopile foundation structural components, and can be mass-produced.