38 results about "Glycol formation" patented technology

The invention relates to the production and use of polyester polyols, formed from at least one carboxylic acid anhydride and ethylene glycol, wherein a specialized reaction control substantially suppresses the formation of 1,4-dioxane from diethylene glycol.

The invention provides a high-barrier modified ZnO / PET protective film and a preparation method thereof, belonging to the technical field of polymer composite material synthesis. The preparation method comprises: using zinc stearate as a zinc source and a modifying agent to prepare modified nano-ZnO, then mixing the modified nano-ZnO with ethylene glycol to obtain a ZnO / ethylene glycol complex, and then mixing with terephthalic In-situ polymerization of formic acid to obtain PET modified masterbatch, and finally PET modified masterbatch and PET resin for injection molding. The modified nano-ZnO of a high barrier protective film prepared by the method of the present invention is not easy to agglomerate due to the formation of a complex with ethylene glycol, has a huge surface area and hydrophobic ability, has an excellent ability to block water vapor, and avoids external water vapor. The steam enters the inner side of the protective film, and at the same time, it can absorb the water vapor inside the protective film, making it a more excellent substitute in the fields of biomedical packaging and food preservation.

The invention discloses an application of a rosiglitazone nano preparation in treating vascular restenosis. A rosiglitazone composition contains rosiglitazone, a polylactic acid-polyglycolic acid copolymer, lecithin and distearyl phosphatidyl ethanolamine-polyethylene glycol 2000. A rosiglitazone nano preparation is nano particles formed by rosiglitazone, polylactic acid-polyglycolic acid copolymer, lecithin and distearyl phosphatidyl ethanolamine-polyethylene glycol 2000, the structure is of a spherical structure, and the particle size is between 250 nm and 300 nm. The invention also discloses a preparation method of the rosiglitazone nano preparation, and the rosiglitazone nano preparation can effectively treat vascular restenosis after implanting of an intravascular stent, and can reduce the toxicity of rosiglitazone and improve the biological safety.

A process for the preparation of (S)-omeprazole from racemic omeprazole via the formation of an inclusion complex with (S)-1,1,2-triphenyl-1,2-ethanediol. (S)-Omeprazole is recovered in a substantially optically pure form either in neutral form or as a pharmaceutically acceptable salt or as its solvates including hydrates. The (S)-omeprazole 2[(S)-1,1,2-triphenyl-1,2-ethanediol] inclusion complex is new. This resolution process proceeds with high yields and high optical purity.

The invention belongs to the field of helmet functional materials, and particularly relates to a foaming composite material for a bicycle safety helmet, and a preparation method thereof. The preparation method comprises: dispersing a premix formed by a silicon dioxide wet gel, polyether and Arabic gum powder into a pre-reacted polyurethane oligomer; further carrying out a foaming reaction on polyether and the oligomer while uniformly dispersing a wet gel and Arabic gum in polyurethane foam; and immersing polyethylene glycol 600, and adsorbing to form the uniform non-Newtonian fluid from silica, Arabic gum, polyethylene glycol 600 in polyurethane foam. According to the invention, the foaming material generally has good softness and good buffer property during the use, so that the helmet isendowed with good comfort; and when the helmet is subjected to violent collision, the non-Newtonian fluid formed by silicon dioxide, Arabic gum and polyethylene glycol 600 in the composite foaming material is rapidly gathered and becomes hard from soft due to rapid impact, so that the helmet is not prone to being broken and pierced, and the head is protected against injuries.

The invention belongs to the field of nanometer materials and nanometer technologies and in particular relates to a silkworm-chrysalis-shaped PbS quantum dot / graphene composite material and a preparation method thereof. The preparation method comprises the steps of evenly dispersing graphene oxide into ethylene glycol to form graphene oxide-ethylene glycol dispersion liquid; adding lead nitrate powder into the graphene oxide-ethylene glycol dispersion liquid to obtain lead nitrate-graphene-ethylene glycol dispersion liquid; dissolving sodium sulphide into ethylene glycol to form sodium sulphide-ethylene glycol solution; processing the lead nitrate-graphene-ethylene glycol dispersion liquid through ultrasound, adding the sodium sulphide-ethylene glycol solution into the lead nitrate-graphene-ethylene glycol drop by drop and mechanically stirring to obtain PbS quantum dot-graphene dispersion liquid after reaction; then centrifugally separating, washing and drying to obtain the PbS quantum dot / graphene composite material. The prepared PbS quantum dot / graphene composite material is of a silkworm-chrysalis-shaped three-dimension structure, even in quantum dot particle size and excellent in gas-sensitive property to ammonia gas in a room temperature and a low temperature.