73results about How to "Prolong the freezing time" patented technology

The invention provides a carboxymethyl curdlan gum physical hydrogel and a preparation method thereof, belonging to the technical field of high polymer material; the mass percent of the carboxymethyl curdlan gum physical hydrogel is 3-20% while the balance is water. The preparation method comprises the following steps: preparing carboxymethyl curdlan gum aqueous solution; regulating pH value and performing freeze-thaw treatment; compared with the prior art, the invention adopts the freeze-thaw treatment to prepare carboxymethyl curdlan gum physical hydrogel; the preparation method is easy and convenient and the strength of the hydrogel can be enhanced through increasing freeze-thaw circling times, reducing freeze temperature, prolonging freeze time and the like; no chemical cross-linking agent or organic solvent with poison and side effect to organism is introduced in the hydrogel preparation process with freeze-thaw treatment. The carboxymethyl curdlan gum has immunity activity and anti-tumor activity, so the physical hydrogel has potential application in biomedical sciences, such as being taken as sustained and control drug carrier, and has more advantages compared with other hydrophilic gums.

A method and equipment for improving quality of vegetable oil through continuous crystallization, crystal growing, and dewaxing refining are disclosed. Oil and grease dewaxing is performed through eight-stage staged cooling crystallization, six-stage constant-temperature crystal growing, and two-stage low-temperature filtration. Special crystallization and crystal growing devices are adopted, interferences of transmission on crystallization and crystal growing processes are effectively solved as a whole, the heat conduction efficiency is higher, crystal damage caused by a transmission device and relative movement in an oil and grease system is less, energy consumption is lower, crystal dispersibility is significantly improved, and aggregation effects of wax, esters and high-melting-point fat are better. The method and the equipment can further improve dewaxing, winterization and dewaxing effects in crystallization and crystal growing processes of wax-containing vegetable oil, prolong oil product refrigeration time to 60 h or above, improve flavor and quality of oil and make oil palatability good. The method and the equipment are suitable for corn oil, sunflower seed oil, soybean oil, rice bran oil, and the like, and are particularly suitable for corn oil, sunflower seed oil, and the like.

The invention discloses a plant root freezing slice manufacturing method for synchronous radiation X-ray fluorescence microanalysis. According to the method, a sample is pretreated, an OTC (optical coherence tomography) freezing embedding agent is improved, the sample is soaked by the improved OTC freezing embedding agent, polyvinyl alcohol, polyethylene glycol and polyvinylpyrrolidone are mixed according to a certain proportion to form the improved OTC freezing embedding agent, the temperature of a slice knife edge is controlled, a user observes whether hardness and softness degrees of the sample and the improved OTC freezing embedding agent are consistent in trimming or not, and the success rate of a fresh plant root slice can reach 100% by prolonging freezing time and suitably improvingtemperature. According to the method, a fresh plant root tissue freezing slice with an integrated structure can be acquired, and a strong technical support is provided for development of synchronousradiation X-ray fluorescence microanalysis of fresh plant root tissues, research of absorption and accumulation micro-zonal distribution of heavy metals, nutrient elements and microelements in plantsand the influence of the heavy metals on physiological ecology of the plants.

The invention discloses a quick-freezing fresh-keeping method and a tunnel-type fresh-keeping quick-freezing machine. The tunnel-type fresh-keeping quick-freezing machine comprises a fixing frame, a transmission roller shaft and a storehouse body, wherein the storehouse body is provided with a transmission mesh belt; the storehouse body is arranged on the fixing frame; a fresh-locking chamber anda freezing chamber are arranged in the storehouse body; the fresh-locking chamber and the freezing chamber are mutually connected; a liquid nitrogen spraying device is arranged in the fresh-locking chamber; a plurality of atomizing spray heads are arranged on the liquid nitrogen spraying device; an air cooling device is arranged in the freezing chamber; the storehouse body is provided with a regulating and controlling system electrically connected with the liquid nitrogen spraying device and the air cooling device; and the two ends of the storehouse body are provided with a feeding port and adischarging port. According to the quick-freezing fresh-keeping method and the tunnel-type fresh-keeping quick-freezing machine, the mechanical compression refrigeration and the liquid nitrogen refrigeration are effectively combined, a frost protection layer is formed on the surface of material by spraying liquid nitrogen to protect the moisture of the material from losing so as to ensure the freshness of the material, and then a mechanical compression refrigeration is adopted to carry out deep refrigeration so as to avoid dehydration of the surface of the material due to direct air cooling soas to ensure the freshness and taste of the material; and meanwhile, the fresh-locking and fresh-keeping effect are achieved, full-automatic operation is achieved according to set parameters, and energy consumption is reduced.

The invention relates to a pseudo-ginseng vacuum freeze-drying method and application thereof, and relates to the technical field of traditional Chinese medicine processing. According to the vacuum freeze-drying method, pseudo-ginseng homogenate is subjected to pre-freezing and vacuum drying treatment, in the pre-freezing step, pre-freezing is carried out in stages at the temperature of minus 20-minus 75 DEG C, and in the vacuum drying treatment step, vacuum drying is carried out at the temperature of minus 20-30 DEG C. The vacuum freeze-drying method is applied to preparation of pseudo-ginseng processed products, and the obtained pseudo-ginseng processed products are high in cleanliness, fine and smooth in taste, stable in quality, accurate in dosage, convenient to apply and carry, high in dissolution and absorption speed, higher in product standardization, higher in production efficiency and suitable for daily life of normal people.

The invention discloses an adhesive self-resistance heating / super-hydrophobic integrated gradient thin film material. The thin film material is made of adhesive resin, insulating resin, thermally andelectrically conductive filler and thermally conductive and insulating filler, wherein the adhesive resin and the insulating resin separately form a bonding layer and a substrate which are bonded together; and the thermally and electrically conductive filler and the thermally conductive and insulating filler are added to a middle layer and an upper layer of the substrate correspondingly to dividethe substrate into three gradient regions from top to bottom, wherein the surface of the uppermost region is constructed with a super-hydrophobic structure. The adhesive self-resistance heating / super-hydrophobic integrated gradient thin film material has the beneficial effects that (1) only the insulating resin is used in a main part, the functionalization of different regions is realized while ensuring that the interface influence between layers of different materials does not exist in a structure, mechanical properties are significantly improved, and stratification is not prone to occurring;and (2) anti-icing and de-icing are integrated into one, the icing time can be effectively delayed, low-energy electric heating de-icing can be achieved, and the energy utilization efficiency of aircrafts can be ultimately improved.

The invention provides a preparation method for an abrasion-resistant super-hydrophobic coating. The preparation method comprises the following steps that acrylates copolymer and BYK-333 are mixed jointly and stirred uniformly, then a blended solution of ethyl acetate and butyl acetate is added, and adipic acid / neopentyl glycol / trimellitic anhydride copolymer, acetyl tributyl citrate, and epoxy resin are sequentially added after stirring is carried out for a moment, nitrocellulose is added to obtain a solution A; and an aluminum sheet is placed on a spin coater, a nano silicon dioxide particlesolution is immediately coated in a spinning mode after spin coating is completed, and then drying is carried out to obtain the abrasion-resistant super-hydrophobic coating. Hydrophobic modified silicon dioxide insets in the surface or an inner hole of PMMA, so that a white abrasion-resistant coating with a static WCA of 168 degrees + / -0.9 degrees and a rolling angle of less than 1 degree is obtained. The abrasion-resistant super-hydrophobic coating has the advantages of good self-cleaning effect, anti-icing and acid-alkali-resistant properties and capable of being applied to different substrates, and the above advantages provides a certain reference value for the industrial market requirement that super-hydrophobic materials has a certain mechanical stability and environmental adaptability.

The invention discloses an anti-icing insulator coating and a preparation method thereof, and relates to the technical field of coatings. The coating comprises, by weight, 20-32 parts of fluorosilicone modified acrylic resin, 30-46 parts of modified silicone resin, 6-14 parts of a modified polyperfluorinated ethylene propylene emulsion, 3-7 parts of modified nano-silica, 2-6 parts of hexamethyldisilazane, 1-5 parts of a modified composite filler, 10-20 parts of n-butyl acetate and 10-30 parts of propylene glycol methyl ether acetate. The coating has the advantages of obvious delayed icing effect, great reduction of the icing amount, easiness in deicing, reduction of the influence of ice and snow weather on power equipment, facilitation of improvement of the operation reliability of a powertransmission line and prolongation of the normal operation period.

The invention provides a seafood packaging box. The seafood packaging box comprises a box body, a box cover, a separation plate, a water pipe and an edge strip, wherein the box body is a groove-shaped shell with an upper opening and the upper opening is connected with the box cover; the transverse separation plate is arranged in the box body; the distance between the separation plate and a bottom plate of the box body is smaller than the distance between the separation plate and the opening of the box body; the upper end face of the separation plate is machined into a hollow surface; the separation plate is provided with a through hole, namely a water seepage hole; the water pipe is arranged on the side surface of the box body; one end of the water pipe is arranged at the outer part of the box body; and the other end of the water pipe is correspondingly arranged in a cavity between the separation plate and the bottom plate of the box body. The seafood packaging box has the advantages of convenience for transportation, safety and sanitation, good fresh-keeping effect and the like.

The invention discloses a stem cell cryopreservation method and a cell cryopreservation solution used by the stem cell cryopreservation method, and belongs to the technical field of stem cell preservation and culture. The stem cell cryopreservation method comprises the following steps: S1, preparing a solution I; S2, preparing a solution II; S3, taking human adipose tissue-derived stromal cells, washing the cells with PBS once, digesting the cells with 0.05% trypsin to change the cells from fusiform to roundness to obtain a cell suspension, and then centrifuging the cell suspension; S4, takingthe solution I to re-suspend the cells; S5, taking the solution II to resuspend the cells; and S6, putting a cryopreservation tube into a programmed cooling box; putting the cell cryopreservation tube in liquid nitrogen for long-term preservation. The cell cryopreservation solution comprises a liquid I and a liquid II, wherein the liquid I comprises human serum albumin, bFGF and EGF, and the liquid II comprises serum replacement cytochrome C, betaine, antifreeze protein, glucose, low-molecular-weight glucan, mannan, sodium chloride, sodium lactate, potassium chloride, calcium chloride and dimethyl sulfoxide. The method has the advantage of improving the cryopreservation quality and stability of the cells.

The invention belongs to the technical field of material surface ice removal, and discloses a super-hydrophobic icing prevention coating with an active photothermal deicing function, a coating layer,a preparation method of the coating and an application of the coating. The coating mainly comprises silicon carbide micro-powder, carbon nano tubes, adhesives, hydrophobic agents and solvents, the weight ratio of the silicon carbide micro-powder to the carbon nano tubes is (0.5-20):1, the weight ratio of the adhesives to the carbon nano tubes is (40-100):1, the weight ratio of the hydrophobic agents to the carbon nano tubes is (4-10):1, the adhesives are provided with silane coupling agents, and the hydrophobic agents are provided with long-fluorine carbon chain silane coupling agents. The coating layer is prepared from the coating. The coating is applied to material surface icing prevention. The coated layer prepared from the icing prevention coating prolongs icing time of super-cooled liquid droplets, ice adhesion of the surface is reduced, rapid heating is achieved under irradiation of near-infrared light, rapid photothermal deicing is achieved, active photothermal deicing and passive icing prevention of the coating layer are combined, and rapid remote deicing is facilitated.