42results about How to "High oxygen content" patented technology

This invention relates to oxahydrofluoroether compounds and a preparation method and application of the new oxahydrofluoroether compounds. The oxahydrofluoroether compounds are compounds represented by a general formula of CF3O(CF2O)mCF2CF2R, wherein R is OR1 or (OCF(CF3)CF2)nOR2 or OCF2CF2OR3, and R1, R2 and R3 are linear-chain or branched-chain C1-C3 alkyl groups. The designed new oxahydrofluoroether compounds have a structure with high content of the oxygen element, extremely low surface tension and stronger permeability than those of other hydrofluoroether solvents, and can be applied to cleaning agents so as to ensure thorough cleaning; meanwhile, due to high content of oxygen and a short atmospheric lifetime, the hydrofluoroether compounds can be easily degraded to CO2 and fluoride salts, and have a low GWP value which is the greenhouse effect potential value; the oxahydrofluoroether compounds have good application in anti-fingerprint liquid diluents, dilution of a fluorine-containing treating agent, removal of contaminants in equipment components, preparation of foamed plastics, welding in a vapor phase, transfer of heat, deposition of coatings on substrates and cutting or grinding aspects.

The invention discloses an inclusion control method for ultrapure austenitic stainless steel for cold-rolled sheets. The preparation method comprises the following steps: I, performing decarburizationblowing, silicon iron reduction and preliminary dexidation on stainless steel mother liquid in an AOD furnace, and adjusting basicity of slag to 1.8 or higher; II, performing slagging-off treatment on ladle slag after tapping; III, performing refining treatment on an LF furnace; IV, performing continuous casting to obtain a continuous casting billet; V, performing hot rolling and cold rolling onthe continuous casting billet, thereby obtaining the stainless steel plate. According to the control method disclosed by the invention, deep deoxidization of aluminum is adopted, and the total oxygencontent is lower than 20 ppm; due to a small amount of inclusion, the prepared stainless steel is high in salt spray resistance and corrosion resistance; the inclusion type in the stainless steel prepared in the invention is mainly fine magnesium aluminate spinel, and the stainless steel does not extend in a rolling process and does not form defects on the cold drawing surface.

The invention discloses a method for dispersion of multi-walled carbon nanotubes. The method utilizes a large number of cheap graphene carbon dots to disperse multi-walled carbon nanotubes, the oxygencontent of the graphene carbon dots is adjustable, therefore when the graphene carbon dots are used for dispersing multi-walled carbon nanotubes, the dispersion concentration can be adjusted between0.4mg / mL and 0.8mg / mL. The method selects vitrifiable polyimide, polyacrylonitrile, asphalt and other carbon industrial waste as the anode raw materials, which are subjected to electrolysis by clean electrochemical method for efficient preparation of graphene carbon dots. Moreover, the aforementioned vitrifiable industrial waste is prepared in large scale along with the production of industrial products at present, the price is low, and the preparation cost of the graphene carbon dots is reduced. The graphene carbon dots and the multi-walled carbon nanotubes are carbon in nature, so that the problem of compatibility between a dispersing agent and a dispersed body can be solved by using the hydrophilic graphene carbon dots to disperse the hydrophobic multi-walled carbon nanotubes.

The invention discloses a multistage aeration device for sewage treatment. The device comprises a main machine body, a sewage chamber is arranged in the main machine body, the left side surface of themain machine body is provided with an induction box, an induction chamber is arranged in the induction box, a connecting tube and a three-way tube are communicated between the induction chamber and the sewage chamber, the connecting tube is located at the upper side of the three-way tube, the leftward extension part of the three-way tube is communicated with an external sewage source, an electromagnetic valve for controlling the three-way tube to communicate with or seal the sewage source is fixedly mounted outside the three-way tube, and a stirring mechanism capable of stirring the sewage toprevent particles from settling is arranged in the sewage chamber. The device can greatly increase the oxygen content of the sewage by two aeration processes, so the microbial reaction in the sewageis sufficient, and the sewage can be purified quickly.

Disclosed is an oil combustion method for reducing greenhouse gas emissions in which an athermal radiation type oil burner is arranged on a stove. The athermal radiation type oil burner includes a furnace body (1) in which a hearth (2) is placed. The hearth (2) composed of a casing with multiple through holes (3) includes a primary oil supply combustion chamber (21), a secondary oil supply combustion chamber (22) and an obstruction chamber (23). The primary oil supply combustion chamber (21) is a casing (211) divided into an upper layer and a lower layer. An interconnected hole (4) is arranged between the two layers. Multiple through holes (5) are distributed on the casing (211) and communicated with the secondary oil supply combustion chamber (22), which is formed by the interval among the casing (211) of the primary oil supply combustion chamber (21), an isolation plats (6) with multiple through holes (61) arranged on the casing (211) and the hearth (2). The obstruction chamber (23) is composed of a sealing plate (7) on the furnace body (1) and the isolation plate (6). Flame holes (71) are arranged on the sealing plate (7). Air flow holes (8) are formed on the corresponding positions of the isolation plate (6) and sealing plate (7), respectively. The secondary oil supply combustion chamber (22) and the obstruction chamber (23) are interconnected with the air flow holes (8). Oil in the burner is continuously spilt, gasified, expanded and compressed for multiple times in the furnace body (1), and oil molecules completely release heat energy and do not release heat radiation again. The burner ensures that generated harmful gas is reduced.

It is an object to provide a resist underlayer film forming composition having a large selection ratio of a dry etching rate, and having a k value and an n value at a short wavelength such as an ArF excimer laser, both of which exhibit desired values. There is provided a resist underlayer film forming composition containing a polymer obtained by reacting at least a tetracarboxylic dianhydride having an alicyclic structure or an aliphatic structure and a diepoxy compound having two epoxy groups with an organic solvent containing an alcohol-based compound having an OH group, and a solvent.