35results about How to "Won't crystallize" patented technology

The invention discloses a high-purity Delta terpilenol separation and purification method, which comprises the following steps: A, rectification, namely adding a Delta-terpilenol raw material to a rectifying tower, controlling the reflux ratio to be (800-1000) to 1, and collecting fractions of 210+ / -1 DEG C to obtain crude Delta-terpilenol, wherein the heating temperature of the tower is 210-220 DEG C, the tower top temperature is 80-150 DEG C, the vacuum degree of the rectifying tower is 750mmHg to 760mmHg; B, crystallization, namely heating the crude Delta-terpilenol to a molten state, mixing the molten crude Delta-terpilenol with 90-98% ethanol according to a mass ratio f 1 to (2.5-5), and crystalizing for 1-5 days at 5-10 DEG C; and C, centrifugal separation, namely adding the crystallized material to a centrifugal machine, centrifuging for 10-30 minutes and then standing, and collecting the crystallized product, wherein the rotation speed of the centrifugal machine is 1500-2000r / min. Due to the adoption of the method, the Delta-terpilenol with the purity being above 99 percent can be obtained by separation.

The invention discloses a thermoplastic elastomer refrigerator door sealing strip material and a preparation method. The thermoplastic elastomer refrigerator door sealing strip material is prepared from the following materials of SEPS (hydrogenated styrene-isoprene) and / or SBS (styrene-butadiene-styrene), LLDPE (linear low density polyethylene), regular polypropylene, filling oil, mineral filler,a lubricant, a coupling agent and an antioxidant. The preparation method of the thermoplastic elastomer refrigerator door sealing strip comprises the following steps of weighing, uniformly mixing, granulating, extruding and forming. The thermoplastic elastomer refrigerator door sealing strip has the advantages that the problem in the refrigerator door sealing strip material using PVC (polyvinyl chloride), TPV (thermoplastic vulcanizate) and the like as the substrates on market is solved; the cold-resistant property is good, the elasticity is good, the deformation recovery ability is strong, the sealing effect is good, the non-toxic and environment-friendly effects are realized, and the recycling effect is realized; the hardness range is broad, the anti-crease effect is good, the dry and fresh effects are realized, the hand feel is comfortable, and any foreign odor is avoided.

The invention discloses a dental pulp mesenchymal stem cell cryopreservation liquid which comprises a component A and a component B. The component A is a serum-free culture medium, and the component Bis composed of the following raw materials: titanic acid nanotubes, disodium adenosine 5-phosphate, vitamin E, 1, 8-cineole and glycerin. No animal serum is added into the cryopreservation liquid, sothat exogenous pollution possibly caused by the animal serum is avoided. 1, 8-cineole and glycerol in the component B have a synergistic effect, so that moisture in cells is prevented from crystallizing when the cells are close to a freezing point, and structural damage in the cells is avoided. Due to the added titanic acid nanotube, disodium adenosine 5-phosphate and vitamin E, on one hand, thecells keep certain activity in the cryopreservation process in liquid nitrogen, and apoptosis of the cells is avoided; on the other hand, after cryopreservation is finished, cells can be quickly recovered, and the activity can be recovered. The invention also provides a dental pulp mesenchymal stem cell cryopreservation method, and the dental pulp mesenchymal stem cell cryopreservation liquid provided by the invention is adopted in the method, no complex programmed cooling is needed, and operation is simple.

The invention discloses an anti-scaling agent for oil well silicate scale. The anti-scaling agent is prepared by compounding a component A, a component B and water according to the mass ratio of 1:1:2, wherein the component A represents random terpolymer the side-chain of which has carboxylic acid, sulfonic acid and carboxylic acid ester functional groups, and the component B represents phosphinocarboxylic acid compound containing a phosphoric acid group-PO(OH)2 and a carboxylic acid group-COOH. The invention is applied to the scaling prevention of a strong base ASP flooding block productionwell, efficiently prevents the silicate from scaling at a pump, a bar pipe and the like, reduces the frequency of operation because of scaling and prolongs the pump inspection period of the productionwell.

The invention discloses a refining treatment technology of camellia oil. The technology comprises addition of phosphoric acid for degumming, alkali refining with sodium hydroxide, washing with water at 80-95 DEG C, oil and water separation, vacuum drying, decolorization through combination of vacuum and a decolorizing agent, deodorization at 210-220 DEG C, cooling crystallization and dewaxing. The technology has the advantages as follows: the acid value is adjusted effectively and the storage performance and quality of the camellia oil are guaranteed; excessive loss of nutrients is avoided, the damage degree of vitamin E is reduced, and efficient decolorization and degreasing can be realized.

The invention provides an immune cell cryopreservation solution and an immune cell cryopreservation method, which are characterized in that the immune cell cryopreservation solution is composed of twoindependent cryopreservation solutions, namely, a cryopreservation solution A and a cryopreservation solution B, and the two cryopreservation solutions are mixed for use according to a ratio of 1: 1(v / v); and when immune cells are cryopreserved by using the immune cell cryopreservation solution, the immune cells are re-suspended first by using the cryopreservation solution A, the cryopreservation solution B with the same volume is then added, the mixed solution is uniformly blown and beaten and sub-packaged into cryopreservation containers, and the cryopreservation containers are transferredinto an ultralow-temperature refrigerator and then transferred into liquid nitrogen for storage after 24 hours. Compared with the existing cell cryopreservation technology, the immune cell cryopreservation solution and the immune cell cryopreservation method have the advantages that immune cells are effectively protected, the operation is simple, the cryopreservation effect is good, the immune cells are not damaged in the cryopreservation process, the safety is high, the physiological function and biological characteristics of the recovered immune cells are guaranteed, the completeness of surface antigens of the immune cells is guaranteed, and the survival time of the immune cells is prolonged.

The invention relates to a technology for processing apricot fructose, comprising the following processing steps: sorting, carrying out enzymolysis, decontaminating, sterilizing, carrying out secondary enzymolysis and clarification, preheating, carrying out ultrafiltration, decoloring, deacidifying, condensing, sterilizing, cooling and filling. Compared with the common sugar (such as cane sugar, beet sugar and the like), the product obtained by the processing technology has the characteristics of high sweetness and low heat; compared with the fructose corn syrup, the apricot fructose has the characteristics of clear and transparent appearance, high fructose content, good mobility and the like, does not crystallize below zero DEG C, is convenient to use, and is used for the industry of beverage, food, pharmacy and the like.

The invention provides a stem cell cryopreservation liquid and a stem cell cryopreservation method, and the stem cell cryopreservation liquid comprises the following components by volume percentage: a serum-free GT-T551H3 culture medium containing 50%-60% of an alpha-MEM basic culture medium; 15%-20% of human serum albumin with a concentration of 15-35 g / l; 1% to 5% of sulfosalicylic acid; 5% to 10% of acetamide; 8%-12% of dimethyl sulfoxide; wherein the volume ratio of sulfosalicylic acid to acetamide is (1: 1)-(1: 10). The stem cell cryopreservation liquid provided by the invention has the advantages; the cell cryopreservation liquid does not contain animal serum, so that the risk of introducing pollution and allergens can be avoided, and the cell cryopreservation liquid has higher clinical safety compared with a conventional cell cryopreservation liquid; and the sulfosalicylic acid and acetamide components can prevent the cells from being damaged due to formation of ice crystals in the cryopreservation process.

The invention discloses a polymer electrolyte capable of working in a wide temperature range, a preparation method of the polymer electrolyte and application of the polymer electrolyte in a solid-state lithium (sodium) secondary battery. The polymer electrolyte is prepared from a precursor solution containing a polymeric monomer, an initiator and an electrolyte salt on the surface of a base material in an in-situ polymerization manner, and is of a hyperbranched structure without a main chain and with multiple branched chains. The polymer electrolyte has the advantages of high ionic conductivity and transference number, wide electrochemical window, good mechanical strength and the like, and can stably work in a temperature range of -40-110 DEG C. Meanwhile, the preparation method of the polymer electrolyte is simple, mild in condition, low in preparation cost, easily available in raw materials and suitable for large-scale production. The polymer electrolyte disclosed by the invention isused for constructing a solid-state lithium (sodium) secondary battery, so that the working temperature of the battery can be effectively expanded, and the safety of the battery under extreme workingconditions is improved.

The invention relates to a high-content fomesafen aqueous solution and a preparation method thereof. The preparation method comprises the following steps: adding deionized water into a container, stirring, adding a 97% fomesafen raw medicine, slowly dropping a 99% 2-(2-aminoethoxy) ethanol solution, after dropping is completed, continuously stirring for more than 10 minutes to sufficiently react and neutralize the fomesafen raw medicine with 2-(2-aminoethoxy) ethanol so as to form a transparent solution, finally adding an alkyl glycoside surfactant aid, and uniformly stirring to obtain a fomesafen aqueous solution product.

The invention relates to an immune cell cryopreservation method. The immune cell cryopreservation method comprises the following steps: immune cell cryopreservation liquid is prepared, wherein the immune cell cryopreservation liquid is prepared from the following raw materials in percentage by weight: 3-7 mL of dimethyl sulfoxide, 2-6 mL of dextran, 15-25 mL of a cell culture medium, 2-4 mL of human serum albumin, 2-4 mL of raffinose, 2-4 mL of glucose, 1-3 mL of propylene glycol and 60-80 mL of human autologous plasma; and immune cells are cryopreserved through the immune cell cryopreservation liquid. Compared with the prior art, the immune cells are effectively protected against freezing damage, safety is high, damage to the cells is small, and the recovery survival rate of the immune cells can be increased and can reach 96% or above.

The invention discloses a preparation method for a polyurethane air filter element of a car. The preparation method comprises the following steps: carrying out a 2-4 hours' reaction at 40-80 DEG C by utilizing 60-90 parts by mass of polyether polyol, 10-40 parts by mass of polyester polyol, 1-4 parts by mass of diethylene glycol, 2-6 parts by mass of triethanolamine, 2-8 parts by mass of black polyether slurry and 1-10 parts by mass of triethylene diamine, so as to obtain a solution A; carrying out a 4-8 hours' reaction at 60-100 DEG C to prepare a solution B; starting a glue-injection machine to carry out glue injection, wherein the mass ratio of the solution A to the solution B is 100:(15-30); after glue injection, inserting a filter paper element, and 6-8 minutes later carrying out demoulding to obtain the polyurethane air filter element. The preparation method is simple, convenient and feasible; the prepared solution B is prevented from crystallizing at -40 DEG C, so that a cumbersome working procedure of heating and dissolution in the preparation process is avoided, and the prepared polyurethane air filter element is high in flexibility and mechanical strength.

The invention provides an immune cell cryopreservation method. The immune cell cryopreservation method comprises the following steps: S1, acquiring immune cells; S2, acquiring human autologous plasma; S3, preparing a cell freezing medium; S4, carrying out cell cryopreservation. According to the immune cell cryopreservation method provided by the invention, the immune cells can be effectively prevented from being damaged by freezing, the recovery survival rate of the immune cells is improved, and the resveratrol added into the cell cryopreservation liquid can promote the multiplication capacity of the recovered immune cells, so the activity of the recovered cryopreserved immune cells is improved; hydroxyethyl starch, propylene glycol and polyethylene glycol can replace the protection effect of dimethyl sulfoxide, the use amount of dimethyl sulfoxide is reduced, it is guaranteed that when cells are close to the freezing point, water in the cells cannot crystallize, damage to the cells is small, and foreign protein cannot be introduced into human autologous plasma added into the cell freezing medium, so the possibility of animal disease source pollution is reduced, and the potential safety hazard of exogenous serum is avoided.

The invention discloses a method for regulating nutrients in a diammonium phosphate product. Aiming at the characteristic that the danger coefficient for regulating the nutrient ratio in the diammonium phosphate product by adding concentrated sulfuric acid is high, ammonium sulphate slurry and ammonium sulfate crystal are produced through adding and dissolving phosphogypsum into diammonium phosphate slurry so as to embed ammonium sulfate into the diammonium phosphate product, thus the stable product quality is maintained, the consumption of a phosphorus resource is reduced, the nitrogen content of the diammonium phosphate product is increased and the production cost is lowered. The ammonium sulfate (NH4) 2SO4 has the nitrogen content of 21%; after the ammonium sulfate is added into the diammonium phosphate product, components of the diammonium phosphate product can be changed and the ammonia content of the diammonium phosphate product can be increased; by the method, not only phosphorus reduction and nitrogen increase of the diammonium phosphate product can be effectively promoted to keep stable product quality; the used ammonium sulfate slurry is produced by a device for producing ammonium dihydrogen phosphate from the phosphogypsum, so that high consumption of the phosphogypsum can save the treatment cost of the phosphogypsum, reduce the environment-protecting pressure and prolong the service life of a phosphogypsum slag field.

The invention relates to a storage device of chemical materials for manufacturing automotive interiors. The storage device mainly aims to solve the problems certain chemical materials are prone to crystallization in the storage process, and the like. The storage device comprises a storage tank, a discharge pipe on a storage tank body is connected with a transverse pipe through a discharge brake valve, and ball valves at the two ends of the transverse pipe are respectively connected with a set of feeding and feeding back system. A tee joint A of each feeding and feeding back system is connected with the ball valve at one end of the transverse pipe, the tee joints A are connected with a pneumatic actuator A and a pneumatic actuator B, the pneumatic actuator A is connected with a tee joint B, the other port of the tee joint B is connected with an inlet end of a feeding and feeding back circulation pump through a filter, a pipeline of an outlet end is connected with a tee joint C, a full-automatic vent valve and a check valve are arranged on the pipeline, one pipeline of the tee joint C is connected with the pneumatic actuator B, one pipeline of the tee joint C is connected with a tee joint D through a feeding and feeding back pneumatic actuator, and a feeding back pipeline of the tee joint D is connected with the tee joint B through a pneumatic actuator C. The storage device has the advantage that the materials, even in a large number, will not be prone to crystallization in the storage process.

The invention belongs to the technical field of electrical materials, and provides a high-temperature-resistant and cracking-resistant cable material and a preparing method thereof. The cable material is prepared from, by weight, 52-64 parts of high-density polyethylene, 17-32 parts of hydrogenated styrene-isoprene-styrenic block copolymer, 1-7 parts of composite fiber materials, 2-5 parts of glyceryl stearate, 2-5 parts of color master batch, 1-4 parts of lubricant, 0.6-2.8 parts of coupling agent, 1.3-3.4 parts of stabilizer and 1.6-2.9 parts of plasticizer. The high-temperature-resistant and cracking-resistant cable material has the advantages of being resistant to high temperature and cracking and easy to process, and has high practical value.

The invention discloses a method for preparing tetrafunctional ketoximino silane in liquid state at room temperature, and aims to overcome the inconvenience brought by crystallization when tetrafunctional ketoximino silane is used for preparing quick-curing RTV silicon rubber. According to the method, diacetylmonoxime, methyl isobutyl ketoxime and No.120 solvent oil are pumped into an agitation reaction kettle as per certain proportion; under the condition of agitation, silicon tetrachloride and ammonia gas are added at the same time, the speed of adding silicon tetrachloride and ammonia gas is controlled to keep the reaction temperature at 20-80 DEG C; the reaction is stopped after completion of charging; filtration is performed to separate out a byproduct ammonium chloride so as to obtain a semi-finished product of tetrafunctional ketoximino silane; the semi-finished product is firstly placed into a first film evaporator to distil out the No.120 solvent oil, and then is placed into a second film evaporator to distil out excessive diacetylmonoxime and methyl isobutyl ketoxime, so that a product can be obtained. Tetrafunctional ketoximino silane prepared through the method has similar activity as tetrakis (methylethylketoximino) silane, and is free of crystallization at low temperature, so that the use is greatly facilitated.

The invention provides a non-crystalizing material conveying pipe. The non-crystalizing material conveying pipe comprises a main pipeline, and is characterized in that the outer side of the main pipeline is coated with a layer of heat-preserving cotton; a plurality of steam tracing pipes are embedded between the heat-preserving cotton and the main pipeline; the main pipeline tilts by 15 degrees towards one conveying end in a horizontal direction. The non-crystalizing material conveying pipe has the advantages and beneficial effects that hot steam is introduced into the steam tracing pipes, so that the temperature of the main pipeline can be kept, and conveyed materials are prevented from being crystallized; heat of the steam tracing pipes is utilized more effectively through the heat-preserving cotton on the outer sides of the steam tracing pipes, so that heat loss is reduced; by forming an inclination angle, materials in the main pipeline flow towards a source end when conveying is stopped, and are prevented from being left in the main pipeline and influencing next conveying.

(S)-4-hydroxy-2oxo-1-pyrrolidine acetamide hydro-acupuncture for injection is characterized in that (S)-4-hydroxy-2oxo-1-pyrrolidine acetamide, propylene glycol, lecithin, vitamin C, ethylene diamine tetraacetic acid and benzyl alcohol which are used as raw materials and auxiliary materials undergo steps of concentrated mixing, diluted mixing, encapsulation, sterilization, inspection and packaging to prepare the (S)-4-hydroxy-2oxo-1-pyrrolidine acetamide hydro-acupuncture for injection. During the sterilization process of the (S)-4-hydroxy-2oxo-1-pyrrolidine acetamide injection, pH value of the solution is barely changed, and impurity increasing amount during the sterilization process is only 0.05%. The finished product will not be crystallized during the storage process, is not easy to oxidize, and has good stability. The period of validity is as long as 18 months and above. During the period of validity, the product has less impurity, and the total impurity content is lower than 0.29%. Pains of patients are obviously reduced during the injection process, and patients' compliance is good. The product is worthy of market promotion.

The invention discloses a Chinese salad seasoning and a preparation method of the Chinese salad seasoning and belongs to the field of seasoning preparation. The Chinese salad seasoning comprises the following raw materials in parts by weight: 10-15 parts of freeze-dried powder of passion fruit aqueous extract, 6-8 parts of soybean tissue protein, 6-8 parts of dendrobium candidum, 15-20 parts of vinegar beans, 10-12 parts of table salt, 0.5-1 part of disodium5'-ribonucleotide, 10-15 parts of monosodium glutamate, 5-8 parts of spices, 10-12 parts of edible vinegar and 15-20 parts of camellia oil. The seasoning prepared according to the preparation method is rich in beneficial substances such as various amino acids, proteins, phospholipids and the like. Used for flavoring of the Chinese salads, the Chinese salad seasoning makes the Chinese salads delicious in taste. Moreover, the Chinese salad seasoning also has the functions of promoting the secretion of saliva or body fluid, nourishing the stomach, improving appetite, postponing senility and so on.

The invention provides a renewable energy hydrogen production and hydrogen storage system and its control method. The system includes a renewable energy power generation subsystem, a water electrolysis hydrogen production subsystem, a heat tracing subsystem and an organic hydrogen storage subsystem, wherein, The heat tracing subsystem is connected between the organic matter hydrogen storage subsystem and the water electrolysis hydrogen production subsystem, and part of the heat generated when the organic matter hydrogen storage subsystem generates hydrogenated organic matter is transferred to the water electrolysis hydrogen production subsystem through the heat tracing subsystem. Water electrolysis hydrogen production device heating. This scheme uses the heat generated when hydrogen reacts with organic matter to heat the water electrolysis hydrogen production device to ensure that the liquid in it will not freeze or crystallize in cold seasons. While ensuring the safety of the system, it can reduce the next startup time, thereby Improve the production efficiency of water electrolysis hydrogen production device. At the same time, part of the heat of the hydrogenated organic matter is used to heat the water electrolysis hydrogen production device, which reduces the amount of cooling water required for cooling the hydrogenated organic matter and improves the energy utilization rate of the system.

The invention provides an anti-impact wear-resistant adhesive coating and a preparation method thereof. The wear-resistant adhesive coating consists of a component A and a component B, wherein the component A is a mixture of 2 to 15 parts of aramid pulp, 20 to 70 parts of bisphenol A epoxy resin, 10 to 40 parts of bisphenol F epoxy resin, 300 to 400 parts of silicon carbide, 50 to 100 parts of alumina, 0 to 5 parts of silica and 0 to 5 parts of silane coupling agent; the component B is a mixture of 5 to 15 parts of polyamine, 1 to 5 parts of polythiol, 20 to 40 parts of alumina, 0 to 5 parts of silane coupling agent, 2 to 8 parts of curing accelerator and 0.5 to 5 parts of silica; and the weight ratio of the component A to the component B in the using process is 10:1, and a hard and wear-resistant composite coating material is formed by reaction and can be used for bonding, repairing and protecting a metal surface. The bisphenol A epoxy resin and the bisphenol F epoxy resin are used as an adhesive substrate, the aramid pulp is used as a toughening agent, and silicon carbide and alumina particles with different particle sizes are added, so that fine particles are filled in large interparticle gaps, bulk density is increased, and the strength and wear resistance of the wear-resistant adhesive coating are improved.

The invention discloses a Chinese salad seasoning and a preparation method of the Chinese salad seasoning and belongs to the field of seasoning preparation. The Chinese salad seasoning comprises the following raw materials in parts by weight: 10-15 parts of freeze-dried powder of passion fruit aqueous extract, 6-8 parts of soybean tissue protein, 6-8 parts of dendrobium candidum, 15-20 parts of vinegar beans, 10-12 parts of table salt, 0.5-1 part of disodium5'-ribonucleotide, 10-15 parts of monosodium glutamate, 5-8 parts of spices, 10-12 parts of edible vinegar and 15-20 parts of camellia oil. The seasoning prepared according to the preparation method is rich in beneficial substances such as various amino acids, proteins, phospholipids and the like. Used for flavoring of the Chinese salads, the Chinese salad seasoning makes the Chinese salads delicious in taste. Moreover, the Chinese salad seasoning also has the functions of promoting the secretion of saliva or body fluid, nourishing the stomach, improving appetite, postponing senility and so on.

The invention provides a (S)-4-hydroxyl-2oxo-1-pyrrolidineacetamide injection. The (S)-4-hydroxyl-2oxo-1-pyrrolidineacetamide injection is characterized by being prepared by taking (S)-4-hydroxyl-2oxo-1-pyrrolidineacetamide, propylene glycol, lecithin, vitamin c and ethylenediamine tetraacetic acid as raw and auxiliary materials through steps of concentrating, diluting, filling and sealing, sterilizing, checking and packaging, wherein the use amount of the raw and auxiliary materials is as follows in percentage by weight: 68 percent to 76 percent of the (S)-4-hydroxyl-2oxo-1-pyrrolidineacetamide, 10 percent to 18 percent of the propylene glycol, 10 percent to 17 percent of the lecithin, 1 percent to 3 percent of the vitamin c and 2 percent to 5 percent of the ethylenediamine tetraacetic acid. The (S)-4-hydroxyl-2oxo-1-pyrrolidineacetamide injection prepared by the invention has the advantages that a product is not crystallized and not easily oxidized in a storage process, the increasing amount of impurities in a sterilization process is only 0.03 percent and the stability is good; the validity period reaches 18 months or more, the product contains few impurities during the validity period and the content of the total impurities is lower than 0.27 percent; a preparation process is simple and feasible and is worthy of being popularized in the market.

The invention discloses an immune cell cryopreservation solution and a cryopreservation method. The cryopreservation solution includes a basal medium and additional components, wherein the additional components include components with the following final concentrations: trehalose 1-5g / mL, propylene glycol 3 ‑6v / v%, acetamide 3‑5v / v%, dextran 5‑10v / v%, hydroxyethyl starch 1‑3g / mL, glucose 0.5‑1.5g / mL, heparin sodium 50‑150U / mL, pearl Grass extract 5-15mg / mL and BCG complex polysaccharide 0.5-1.5mg / mL. The formula of the cryopreservation liquid of the present invention is simple, and each component cooperates with each other and acts synergistically. Under the cryopreservation method provided, the cryopreservation effect of endothelial progenitor cells can be significantly improved, and at the same time, it can also ensure that the cell proliferation activity after recovery is not affected, ensuring that the cell Intracellular water does not crystallize near freezing point.

The invention discloses a polymer electrolyte capable of working in a wide temperature range, its preparation method and its application in a solid lithium (sodium) secondary battery. The polymer electrolyte of the present invention is prepared by in-situ polymerization on the surface of the substrate from a precursor solution containing polymerized monomers, initiators and electrolyte salts, and presents a hyperbranched structure with no main chain and multiple branches, and has ionic conductivity and It has the advantages of high migration number, wide electrochemical window, good mechanical strength, etc., and can work stably in the temperature range of -40-110°C. At the same time, the preparation method of the polymer electrolyte is simple, the conditions are mild, the preparation cost is low, the raw materials are easily available, and it is suitable for scale-up production. The polymer electrolyte of the present invention is used to construct a solid-state lithium (sodium) secondary battery, which can effectively widen the working temperature of the battery and improve the safety of the battery under extreme working conditions.

The invention discloses a cryopreservation solution for dental pulp mesenchymal stem cells, which comprises component A and component B, component A is a serum-free medium, and component B is composed of the following raw materials: titanate nanotubes, 5-phosphoric acid Adenosine Disodium, Vitamin E, 1,8‑Cineole, Glycerin. The cryopreservation solution of the present invention does not add animal serum, which avoids possible exogenous pollution caused by animal serum. The 1,8-cineole and glycerol in component B act synergistically to protect the water in the cells from crystallization when the cells are close to the freezing point and avoid structural damage in the cells. Added titanate nanotubes, disodium adenosine 5-phosphate, and vitamin E, on the one hand, can maintain a certain activity of cells during cryopreservation in liquid nitrogen and avoid cell apoptosis; Helps cells recover quickly and restore activity. The present invention also provides a cryopreservation method for dental pulp mesenchymal stem cells. The cryopreservation solution of the present invention does not require complex programmed cooling and is easy to operate.

The invention discloses equipment improvement for a P5000 machine BPSG process. The invention involves a P5000 machine body and two independent cabinets. A TEOS pipeline is installed above the P5000 machine body, the cabinets are internally equipped with a cabinet set having a vertical two-layer structure respectively, a liquid source stored steel cylinder is placed at the lower layer, the upper layer is equipped with a liquid source output pipeline system, and the liquid source output pipeline system is communicated with the steel cylinder. The invention also involves liquid source extraction pipelines mounted above the cabinets, one ends of the liquid source extraction pipelines are connected to the liquid source output pipeline system and the other ends are in butt joint with the TEOS pipeline, a heater is mounted at the lower layer of each cabinet set, the steel cylinder is placed in the heater, the liquid source extraction pipelines are wrapped by a heating tape, the cabinets are internally provided with a controller respectively, the controllers are in communication connection with the P5000 machine body, and the controllers control the operation of the heaters and the heating tapes. The equipment improvement can realize the BPSG process, also saves cost, and can achieve simple, reliable and efficient replacement of liquid sources.

The invention discloses a preparation method for a polyurethane air filter element of a car. The preparation method comprises the following steps: carrying out a 2-4 hours' reaction at 40-80 DEG C by utilizing 60-90 parts by mass of polyether polyol, 10-40 parts by mass of polyester polyol, 1-4 parts by mass of diethylene glycol, 2-6 parts by mass of triethanolamine, 2-8 parts by mass of black polyether slurry and 1-10 parts by mass of triethylene diamine, so as to obtain a solution A; carrying out a 4-8 hours' reaction at 60-100 DEG C to prepare a solution B; starting a glue-injection machine to carry out glue injection, wherein the mass ratio of the solution A to the solution B is 100:(15-30); after glue injection, inserting a filter paper element, and 6-8 minutes later carrying out demoulding to obtain the polyurethane air filter element. The preparation method is simple, convenient and feasible; the prepared solution B is prevented from crystallizing at -40 DEG C, so that a cumbersome working procedure of heating and dissolution in the preparation process is avoided, and the prepared polyurethane air filter element is high in flexibility and mechanical strength.

The invention discloses an anti-scaling agent for oil well silicate scale. The anti-scaling agent is prepared by compounding a component A, a component B and water according to the mass ratio of 1:1:2, wherein the component A represents random terpolymer the side-chain of which has carboxylic acid, sulfonic acid and carboxylic acid ester functional groups, and the component B represents phosphinocarboxylic acid compound containing a phosphoric acid group-PO(OH)2 and a carboxylic acid group-COOH. The invention is applied to the scaling prevention of a strong base ASP flooding block productionwell, efficiently prevents the silicate from scaling at a pump, a bar pipe and the like, reduces the frequency of operation because of scaling and prolongs the pump inspection period of the production well.