6results about How to "High decomposition temperature" patented technology

The application discloses a method for preparing polylactic acid by using an organic base-sulfourea dual catalytic system, and comprises the following steps: under the catalysis of the organic base-sulfourea dual catalytic system, ring-opening polymerization of lactide is carried out under the action of an initiator to obtain the polylactic acid; and the sulfourea is disulfourea or trisulfourea. The sulfourea catalyst is easy to synthesize, the organic base-sulfourea dual catalytic system formed by modular combination of the organic base and the sulfourea has a high decomposition temperature, and therefore has good high-temperature resistance, so that the controllable ring-opening polymerization of lactide in a solution can be realized, and the controllable ring-opening polymerization of lactide at high temperature can also be realized; the catalyst used in polymerization is a hydrogen bond bifunctional catalyst, and the controllable polymerization effect that cannot be achieved when only alkali is used for catalysis can be achieved, so that the polylactic acid has a narrow molecular weight distribution; by adjusting the ratio of lactide, the initiator, the organic base and the sulfourea, the catalytic activity can be further regulated, and the polylactic acid with a high molecular weight and a controllable structure can be obtained.

The invention discloses a liquid-liquid extraction dearomatization process and system, and belongs to the field of petrochemical industry. According to the process, N, N '-dialkyl pyrrolidone and / or N, N'-dioxypyrrolidone is used as an extraction solvent, and separation is completed through four steps of liquid-liquid extraction, raffinate oil rectification, back extraction and solvent and aromatic hydrocarbon recovery. The aromatic hydrocarbon selectivity and dissolving capacity are enhanced through the double-ring synergistic effect of the twin-structure solvent, the problems that an existing monocyclic solvent is low in selectivity and large in agent-oil ratio, and water washing is needed for solvent recovery are solved, raw material pretreatment and a cosolvent are not needed in the process, the aromatic hydrocarbon recovery rate reaches 85% or above, the solvent recovery rate exceeds 91%, and the method is suitable for industrial production. The method is suitable for high-efficiency separation of aromatic hydrocarbons and non-aromatic hydrocarbons of various fuel oils such as straight-run diesel oil, catalytic diesel oil and reformed gasoline.

This invention relates to the field of organic electroluminescent devices, and discloses a silicon-containing organic compound, its application, and an organic electroluminescent device. The compound has the structure shown in formula (I). The aforementioned organic compound provided by this invention has a high glass transition temperature, a high decomposition temperature, and a high refractive index. When applied as a capping layer on a device, it can improve the light extraction efficiency of the cathode, thereby improving the luminous efficiency of the device.

This invention provides a method for preparing bisphenol A-bis(diphenyl phosphate), comprising the following steps: 1) mixing a catalyst, bisphenol A-bis(diphenyl phosphate), and phosphorus oxychloride uniformly to obtain a mixed solution; 2) heating bisphenol A to a liquid state and continuously feeding it and the mixed solution from step 1) into an esterification reactor for esterification reaction, followed by removal of phosphorus oxychloride to obtain an intermediate reaction solution; 3) preheating phenol and the intermediate reaction solution from step 2), and continuously feeding them into a sealing reactor for sealing reaction, followed by removal of phenol to obtain bisphenol A-bis(diphenyl phosphate). This method allows for all-liquid phase feeding, resulting in a high yield of the flame retardant BDP and a low content of impurity Z in the product.

This application provides an extreme pressure anti-wear hydraulic oil and its preparation method. The raw materials for preparing the extreme pressure anti-wear hydraulic oil include the following components in parts by weight: 80-90 parts by weight of base oil, 2-5 parts by weight of antioxidant, 1-3 parts by weight of rust inhibitor, 0.5-1 parts by weight of pour point depressant, and 0.2-0.5 parts by weight of extreme pressure anti-wear agent; the extreme pressure anti-wear agent is obtained by mixing boronamide and ammonium phosphate ionic liquid in a weight ratio of 1:0.5-1. The preparation method includes the following steps: (1) mixing the base oil and antioxidant in parts by weight, stirring for 10-20 minutes at a temperature of 40-50℃ to obtain a first mixture; (2) adding the rust inhibitor, pour point depressant, and boronamide and ammonium phosphate ionic liquid in parts by weight to the first mixture, heating and refining to obtain the extreme pressure anti-wear hydraulic oil. This application achieves long-term stable operation of the extreme pressure anti-wear hydraulic oil under extreme pressure conditions.

The application provides a nitrogen-containing fused aromatic ring compound and an organic electroluminescent device thereof, and relates to the technical field of organic electroluminescent materials. In order to solve the problems existing in the prior art of organic electroluminescent materials and devices, the application provides a nitrogen-containing fused aromatic ring compound, which is applied to an organic electroluminescent device as a host material of an electron transport layer, a hole blocking layer and a light-emitting layer, so that the luminous efficiency, driving voltage and service life of the device can be effectively improved. The novel nitrogen-containing fused aromatic ring organic compound has a high triplet energy level, appropriate HOMO / LUMO energy level, high electron affinity and electron mobility, is conducive to the transmission of electrons, balances the transmission of holes and electrons, and has a high decomposition temperature and glass transition temperature and good film-forming property, so that the stability and high efficiency of the device can be effectively ensured, and the luminous efficiency of the organic electroluminescent device can be significantly improved when the compound is applied to the organic electroluminescent device as a host material of a light-emitting layer.