32results about How to "Eliminate crystallization" patented technology

The invention relates to an intelligent active freezing-proof coating material and a preparation method and application thereof. The material comprises the following formula: 10-60wt% of thermosensitive phase-change materials, 10-60wt% of heavy molecular weight polymer containing ureides groups and 20-80wt% of solvent. The preparation method is characterized in that the components are stirred and mixed to prepare freezing-proof coating material solution; after the solution is dried by evaporation, the freezing-proof coating material is formed; and the obtained freezing-proof coating material is attached to an objected to be treated by adopting a soaking mode, a manual brush painting mode or an electrostatic spraying mode. Compared with the prior art, the invention has the characteristics that the obtained freezing-proof coating material has long-term freezing-proof capability and favorable aging resistance, wearability and transparency, does not affect matrix color and the like.

The invention relates to a sewage pretreatment device and a method for sewage pretreatment with the device, in particular to a self-heating heat-pump energy-saving device for lurgi furnace gasification sewage and a method for the sewage pretreatment with the device. The problems that the existing lurgi furnace sewage treatment technology is high in energy consumption and operating cost, and equipment is blocked easily are solved. The self-heating heat-pump energy-saving device for the lurgi furnace gasification sewage comprises a vacuum extraction and sedimentation compound tower, an evacuating device, a heat exchange knockout tower, a circulating pump, an aqua-ammonia pump and a sewage circulating pump. The method comprises the steps that hot sewage enters the vacuum extraction and sedimentation compound tower; sensible heat in the sewage entering the vacuum extraction and sedimentation compound tower is converted to gasification latent heat by pressure reduction through the evacuating device; pressure is recovered after the sewage enters the heat exchange knockout tower; the latent heat is released to be converted to the sensible heat; and the heat is sent back by heat-exchange heating low-temperature sewage for cycling. The device and the method can be applied to pretreatment of the lurgi furnace gasification sewage.

D-glass fiber consists of SiO2, Al2O3, CaO, MgO, B2O3 and Fe2O3. It has a lower dielectric constant, viscosity temperature of Log3 is <1300DEG C, liquefaction temperature is <1100DEG C, the difference between the both is above 75DEG C. It can prevent fibre spinning and crystallizing, has good wetting-resistant performance and lower electricity consumption. It can be used for substrate materials for printing circuit board.

The invention discloses a method for preparing a tissue engineering scaffold material by using a degradable synthetic polymer material, which comprises the following steps: (1) forming a polymer sample through molding technology, and then placing it in a high-pressure container; (2) Use a supercritical fluid to replace the gas in the high-pressure container; (3) heat and pressurize the high-pressure container to saturate the high-molecular polymer sample in a high-temperature and high-pressure supercritical fluid atmosphere, and make the high-pressure container The molecular polymer sample is melted at a temperature higher than the critical temperature or critical pressure of the supercritical fluid, eliminating polymer crystallization; (4) cooling down to the foaming temperature; (5) rapid pressure release. The invention melts the crystal region of the high-molecular polymer through high temperature, eliminates polymer crystallization, solves the foaming problem of the linear linear high-crystallinity biological high-molecular polymer, and finally obtains a structure-controllable tissue engineering scaffold material.

The invention discloses a process for producing a benzophenone ultraviolet ray absorbent, and the process includes mixing of a benzophenone compound A and an alkyl halide for alkylation to obtain a benzophenone compound B. The alkyl halide can be prepared by the reaction of a primary alcohol and thionyl chloride under catalysis of a tertiary amine. Further, hydration and distillation of the system after the completion of the alkylation are carried out in order to eliminate crystallization and purification steps. The process is simplified, a high purity product is obtained, solvent consumption is reduced, and the cost is reduced.