11results about How to "Less heat release" patented technology

The invention discloses a method for preparing vitamin D2 with high conversion rate and high selectivity, and belongs to the technical field of organic photosynthesis reaction.The method comprises the steps that an ergosterol solution passes through a first-stage illumination reactor, the illumination wavelength is controlled to be 254 nm, the illumination time is 20-25 min, and an ergosterol ring-opening product reaction solution is obtained through a first photoreaction; the ergosterol ring-opening product reaction liquid passes through a second-stage illumination reactor, the illumination wavelength is controlled to be 365-415 nm, the illumination time is 30-35 min, and a VD2 precursor reaction liquid is obtained through a second photoreaction; the VD2 precursor reaction liquid is heated and converted into VD2 converted oil; and carrying out esterification, crystallization, hydrolysis and recrystallization on the VD2 conversion oil to obtain a VD2 finished product. According to the method, the conversion rate of ergosterol and the selectivity of a target product can be remarkably improved, the purity of a VD2 finished product is improved, the impurity content is reduced, and the VD2 impurity limit requirement specified by European Pharmacopoeia is met.

The invention relates to an epoxy filler and a preparation method thereof, in particular to a low-heat-release high-compression-resistance light epoxy filler capable of being rapidly cured at room temperature and a preparation method of the low-heat-release high-compression-resistance light epoxy filler. The invention aims to solve the problems of large heat release amount, high heat release temperature, low curing speed and insufficient room-temperature curing in the curing process of the existing room-temperature rapid curing type oxygen filler. The invention discloses a low-heat-release high-compression-resistance light epoxy filler capable of being rapidly cured at room temperature. The low-heat-release high-compression-resistance light epoxy filler consists of a component A and a component B The component A is prepared from main body epoxy resin, low-activity epoxy resin, high-hydroxyl novolac epoxy resin, a flexibilizer, a diluent and modified hollow glass microspheres; and the component B is prepared from a low-speed curing agent and a curing accelerator. The filler prepared by the invention can gel in 20-40 minutes, the highest exothermic temperature does not exceed 100 DEG C during room-temperature curing, the density is lower than 0.7 g / cm < 3 > after curing, the room-temperature curing performance and the heating curing performance are equivalent, and the compression strength is greater than 54 MPa.

The present application relates to a current measuring device and a current measuring assembly. When it is necessary to measure the magnitude of the current flowing through certain circuits on a circuit board, the opening of the conductive housing can be snapped onto the surface of the circuit board, and the conductive housing is in electrical contact with the circuit board. When the circuit or component that needs to measure the current is energized to generate current, the current will flow to the conductive column through the conductive housing, and then flow out through the conductive column to form a loop. The current first flows from the edge of the opening to the bottom. Since the conductive column is electrically connected to the bottom and the conductive column extends toward the direction of the opening, the current flows along the extension direction of the conductive column toward the direction where the opening is located. The flow direction of the current in the conductive housing is opposite to the flow direction in the conductive column. Therefore, parasitic parameters such as parasitic inductance can be eliminated to avoid the influence on the dynamic response of the test. Since the cross-sectional area of ​​the conductive housing is larger than that of the wire, the resistance to the current is smaller, which improves the safety performance.

The invention belongs to the technical field of thermotropic liquid crystal polyester synthesis, and particularly relates to a temperature control method of a thermotropic liquid crystal polyester synthesis reaction kettle and a reaction device. According to the invention, heating is stopped when the acylation reaction of the thermotropic liquid crystal polyester reaches the preset temperature, and the material liquid is boiled at a proper temperature and the temperature is constant in combination with air exhaust of the reaction kettle; and when the heat release is slowed down at the later stage of the reaction and the temperature is reduced by material liquid evaporation, the temperature balance is kept by utilizing moderate heating and reducing condensation reflux of byproducts, and the influence of temperature runaway on the product quality is reduced. According to the synthetic reaction device disclosed by the invention, through linkage control of the feed liquid temperature sensor and the gas phase temperature sensor in the reaction kettle and the vacuum regulating valve, the effects of regulating air pressure by temperature and controlling the temperature by air pressure are realized. Therefore, the temperature runaway of the acylation reaction of the thermotropic liquid crystal polyester is reduced by utilizing the boiling state of the feed liquid in the reaction kettle, the boiling mixing of the materials in the feed liquid is improved, and the reaction efficiency and the material utilization rate are improved.

The invention relates to the field of nail oil adhesives, in particular to a nail oil seal adhesive composition, a nail oil seal adhesive and a preparation method and a curing method of the nail oil seal adhesive. According to the nail oil seal adhesive provided by the invention, the heat release influence is reduced by utilizing the steric effect of methyl of methacrylic acid-2-hydroxyethyl ester, and the bifunctional resin CR90631 is selected to replace a part of trifunctional resin CR91517, so that the heat release is reduced, and the adhesive is free of pain in the curing process. The thiol modified polyester acrylate resin CR92509 is selected, so that the problems of strong pungent smell, poor storage stability and the like caused by the fact that a common sealing layer is added with thiol to reduce the influence of oxygen inhibition are solved, and not only is the pungent smell avoided, but also the storage stability is good. The trifunctional resin CR91517 is also selected as a main body substance, so that the compactness of a formed film can be fully improved, and the coating has obvious advantages in alcohol scrubbing resistance and scratch resistance.

The present invention provides a method for producing lithium difluorophosphate, wherein the method allows a difluorophosphate ester to react with a lithium salt compound in a non-aqueous organic solvent, wherein water is not used as a raw material in the reaction; the present invention also provides a method for producing difluorophosphate ester, which has a step of allowing a dihalogenated phosphate ester to react with a fluorinating agent containing a hydrofluoric acid concentration of less than 15 mol% in a non-aqueous organic solvent; the present invention also provides lithium difluorophosphate, wherein the value of the relationship (d90-d10) / MV represented by the particle size d90 of the volume cumulative distribution of 90%, the particle size d10 of the volume cumulative distribution of 10% and the volume average particle size MV is less than 10; the present invention also provides a method for producing a non-aqueous electrolyte using the above-mentioned production method and a method for producing a non-aqueous secondary battery.

The invention discloses gum barrier protection resin and a preparation method thereof. The resin is prepared from 40 to 70 parts of matrix resin, 20 to 40 parts of diluent resin, 5 to 20 parts of inorganic filler, 5 to 20 parts of ointment matrix, 0.1 to 0.5 part of initiator, 1 to 5 parts of auxiliary initiator and 0.1 to 1 part of polymerization inhibitor. The resin has the characteristics of low heat release and moderate curing speed, can prevent heat generated by curing from burning gingival soft tissues, has higher thixotropy, can be tightly attached to gingiva, can reliably isolate corrosive bleaching agents such as peroxide and the like, and can be used for preparing gingival soft tissues. Adverse reactions such as gingival causalgia and itching caused by solidification heat production and chemical irritant leakage are effectively reduced, and the gel is easy to smear, good in flexibility after solidification and easy to peel off integrally.

The invention provides a method for continuously preparing nitrobenzene by taking benzene and NO2 as raw materials. The method comprises the following steps: filling a solid catalyst capable of catalyzing NO2 nitration of benzene in a pipeline reactor, continuously introducing benzene, NO2 and O2 into the pipeline reactor at a certain flow rate, and reacting at a certain temperature to obtain nitrobenzene. The route has the advantages of cheap and easily available raw materials, high reaction efficiency, good selectivity and easy continuous production, and is a safe, green, economic and efficient nitrobenzene synthesis route.

According to the preparation method of the blue light absorbing material, potassium carbonate or sodium carbonate is used for catalyzing etherification reaction, reaction heat release is reduced, meanwhile, the problems of easy gelatinization, easy material rushing and the like caused by reaction overheating are avoided, potassium tert-butoxide is used for catalyzing condensation reaction, the purification procedure is simplified, the reaction conversion rate is increased, and the yield of the blue light absorbing material is increased. Meanwhile, impurity removal methods such as quenching acidification and recrystallization are matched, so that pilot-scale preparation of the beta-diketone compound is realized, and the purity and yield of the product are improved. The blue light absorptivity of the final product is more than 80% under the concentration of 3mg / ml, and the market-oriented and large-scale production requirements are met. The preparation process disclosed by the invention is wide in raw material source, simple in process and high in practical operability, and has a relatively great application prospect in development and production of blue light absorbing materials.

The invention belongs to the technical field of building materials, and particularly relates to an epoxy resin plugging material and a use method thereof. According to the novel solvent-free epoxy resin plugging material provided by the invention, a high-molecular polymer is generated from low-molecular substances through a condensation polymerization reaction, the gel reaction time is delayed, and the construction operation time is relatively long; as the plugging agent is insoluble in water, the plugging agent can be used for driving water and stabilizing sand for plugging a sand body with saturated water, plugging is carried out by utilizing watertightness after solidification, heat release is low during solidification, and damage to a physical structure of a used object cannot be caused. Compared with the existing cement plugging material, the cement plugging material has the advantages of long-term temperature resistance (the temperature is 45-85 DEG C), high compressive strength (the pressure is 30-50 MPa), high plugging strength, high success rate and long period of validity.

This invention provides a method for manufacturing a high-safety carbon material, comprising: step (A), mixing carbon material, coating material, glutaraldehyde, and a solution at a weight ratio of 100:2-6:0.2-0.6:100-300 to form a mixed slurry, wherein the carbon material is soft carbon and / or artificial graphite, and the coating material is chitosan and / or sulfurized chitosan; step (B), stirring the mixed slurry evenly and heating it at 70°C-90°C to form a evaporated slurry; step (C), heating the evaporated slurry at 70°C-90°C for more than 24 hours, and then cooling it to room temperature to form a high-safety carbon material. The method of this invention helps to obtain a high-safety carbon material that can mitigate the large amount of heat released during the decomposition of the solid electrolyte interfacial film, prevent the heat generated by the decomposition of the solid electrolyte interfacial film from triggering the entire thermal runaway mechanism, and improve the safety of the negative electrode material in battery use.