131results about How to "Eliminate potential hazards" patented technology

The invention relates to a method of an alcohol production process in which anaerobic effluent is taken as ingredient water. The method comprises the following steps of: mixing raw materials with deaminized anaerobic effluent in a specified material to water ratio; adjusting pH value and adding liquefied enzyme, heating, digesting and liquefying; cooling, and adding saccharified enzyme for saccharifying; lowering the temperature, inoculating and fermenting; distilling; precipitating sulfate radicals before performing anaerobic treatment on the distilled effluent obtained by distilling; and performing anaerobic treatment on the distilled effluent, and performing deamination treatment to obtain ingredient water for fermenting a next batch of alcohol. By adopting method, the running stability of the process in which the anaerobic effluent is taken as the ingredient water is enhanced, the content of hydrogen sulfide in marsh gas obtained by fermenting anaerobic marsh gas is lowered, and subsequent use of the marsh gas is facilitated.

The invention discloses a method of producing efficient composite polysilicate aluminum and ferric flocculants with fly ash and kaolin. The method is to evenly mix the fly ash, the kaolin and quick lime with water according to a certain proportion. Then, the mixture is heated for 4-8 hours under the temperature of 50-120 degree Celsius, cooled naturally and filtered. The pH value of the filtering liquid is adjusted to be 6-10 to obtain filtering liquid I. Obtained filter residues are added with industrial hydrochloric acid with the concentration of 36.7 percent, heated for 4-8 hours under the temperature of 50-120 degree Celsius, cooled naturally and filtered to obtain filtering liquid II. The filtering liquid I and the filtering liquid II are mixed according to the volume ratio of 1 to 1 and stirred. The pH value is adjusted to be 3-5. Liquid product prepared by the invention is obtained after the standing. The product colligates the advantages of aluminum salt and ferric salt flocculants. The stability and the water purifying water effect are perfect. Water which has been treated does not contain aluminum and other harmful components. The happenings of senile dementia can be effectively reduced. And with waste materials and the fly ash used as the raw materials, the method has the advantages of low production cost, high product added value good economic benefit, environmental benefit and social benefit.

The invention relates to a method for distinguishing effectiveness two-time continuous sampling values of an electric power system, which comprises the steps of: establishing a saltus threshold formula of sampling values of curved continuous points and a saltus threshold formula of sampling values of curved discontinuous points, ensuring that the sampling points with saltus values exceeding the saltus threshold of the sampling values of the curved continuous points become the discontinuous points of a curved line, but are used as effective sampling values of the curved line, wherein the saltus values are less than the saltus thresholds of the sampling values of the curved discontinuous points; and analyzing the application of the limit of the minimum precision threshold of a mutual inductor and the periodical characteristic of a current voltage signal of the mutual inductor to the process of judging the effectiveness of the sampling values. On the basis, a delay 3-point continuous effective judgment method and a delay-free 3-point continuous effective judgment method of the sampling values are invented, the right reliability of sampled data is ensured, operation resistance and misoperation of a protection measuring and controlling device and the like are avoided, and the safe and stable operation of the electric power system is protected.

The invention discloses a low sodium salt ham sausage and a preparation method thereof. The low sodium salt ham sausage is prepared from pork, starch, soy protein isolate, carrageenan, glutamine transaminage, sodium erythorbate, low sodium salt, seasoning, spices, a chromophoric reagent and water. The preparation method comprises the following steps: stirring and mixing the pork, the starch, the carrageenan, the sodium erythorbate, the low sodium salt, the seasoning, the spices and the chromophoric reagent; adding the soy protein isolate and the glutamine transaminage, chopping and mixing; adding water while chopping and mixing; filling the mixture into casing, and cooking; and cooling and storing. The prepared finished product has remarkably reduced content of sodium salt, and does not contain phosphate in favor of human health, thereby being a healthy product suitable for the hypertension crowd.

The invention provides novel cyanide-free silver plating electroplating liquid and an electroplating technology. The cyanide-free silver plating electroplating liquid comprises, by mass concentration, 1.5-4 g / L of silver nitrate, 2-50 g / L of potassium carbonate, 2-100 g / L of hydantoin, 0.1-100 g / L of potassium gluconate, 0.1-100 g / L of potassium malate, 0.1-150 g / L of citric acid, 0.1-280 g / L of hydantoin, 0.1-280 g / L of butynediol and 0.001-20 g / L of alkyl sulfonic acid surface active agent. The electroplating technology comprises the steps of pretreatment, washing, activating, washing, beforehand silver plating, silver plating, recycling, washing, adjusting treatment, washing, hot water washing (80 DEG C), washing and silver protective agent treatment. The novel silver plating technology has the main beneficial effects that firstly, the plating liquid is very stable and easy to control, the current efficiency of the plating liquid is high, and the dispersing capability and covering capability are good; secondly, a cyanide-free formula is adopted in the electroplating liquid, potential danger of cyanide is eliminated, and pollution to the environment is greatly reduced; and thirdly, the various properties of a plating layer are not lower than those of cyaniding silver plating, and a functional cyaniding silver plating technology can be thoroughly replaced.

The invention discloses an anti-bacterium antivirus guanidine salt star-shaped polymer, a preparation method and applications thereof, and the arm number, structure and molecular weight of the star-shaped polymer are controllable. The polymer is prepared by the following steps: adopting a core-first method, taking brominated beta-cyclodextrin as an initiator, guanidine salt oligomer containing carbon-carbon double bonds as the functional monomers, and then carrying out atom transfer radical polymerization so as to obtain the target product, wherein the structure and molecular weight of the polymer can be modulated according to the application needs. The polymer and the preparation method thereof improve the molecular weight of the polymer, achieve chain amplification effect, increase the density of effective functional groups having an anti-bacterium effect, effectively solve the problems of contamination on other products caused by leakage of anti-bacterium agents and nondurable anti-bacterium effect, and eliminate the potential dangers caused by leaked anti-bacterium agents on human health. Furthermore, the polymer has a prominent function, which other guanidine salt polymers do not have, of killing wild type viruses and bacteria such as gland virus, influenza virus, and the like.

The invention provides modified starch for grafting guazatine oligomer as well as a preparation method and an application of the modified starch. The modified starch for grafting guazatine oligomer is obtained by grafting the guazatine oligomer to a starch macromolecular chain by a chemical bonding method, and has a chemical structural formula as shown in the specification, wherein x equals to 2-10, m equals to 2-100, Y is one of Cl<-1>, Br<-1>, NO3<-1>, HCO3<-1> or H2PO4<-1>, and R is a molecular structure obtained by reacting coupling agent, starch and the guazatine. Compared with the prior art, the modified starch provided by the invention effectively avoids the problems that other products are polluted due to antibacterial agent loss, and the antibacterial effect is non-resistant, and relieves the potential hazard of the leaked antibacterial agent to the body health. The modified starch provided by the invention is co-blended with the corresponding paper pump, textile fabric, binder and the like in a proportion of (0.5-10.0wt%), can be used for preparing the products which have high-efficiency broad-spectrum antibacterial anti-mold property and are safe and harmless to the body health, such as papers, textiles and binders.

The invention discloses aging thick oil contaminated soil grads multiple multielement compositional eluate, repairing method and the device. The detailed eluate composition, repairing method, and device can be seen in specification. It has the advantages of high residual soil cleanliness, high crude resources developing degree, simple device operation, and short repairing cycle. The produced eluate can be used to repair aging thick oil contaminated soil in oil field procedure.

The invention discloses a high-yield disease-resistant tenualosa reevesii cultivating technology which comprises five aspects which are feed formula, feed preparation, fish fry release, daily management and disease prevention. A mode of combining refined feed feeding and elaborate management is adopted, the physical ability and constitution of tenualosa reevesii are enhanced, the disease resistance of tenualosa reevesii is improved internally, and the optimal environment suitable for survival of tenualosa reevesii is created through the elaborate management. The disease is prevented at an early stage, preventive measures are taken, and the potential hazard of the disease is eliminated externally; and through internal and external control and comprehensive treatment, the cultivation yield and benefit of tenualosa reevesii are greatly improved.

The invention relates to a method for processing paint slag muck by separating slag muck from water. The method comprises the steps of: pouring water-containing paint slag muck into an upright agitating tank to uniformly mix and agitate; conveying the water-containing paint slag muck from the tank to filter cloth at one end of a tape type filtering machine; vacuum filtering the water-containing paint slag muck continuously running on the filter cloth; collecting the filtrate by a transverse groove on the tape, wherein the filtrate enters a vacuum box from a center hole at the bottom of the groove and moves into a liquid draining tank from a suction filtering hole on the sidewall of the vacuum box to undergo gas-liquid separation; pumping the gas from the top of the liquid draining tank into a water-ring vacuum pump, and exhausting to a clean water tank through a gas outlet of the vacuum pump; draining the liquid from the bottom of the liquid draining tank into a water tank; moving the liquid into a settling pond through the water tank to suction filter; intercepting the solid particles stayed on the filter cloth caused by filtering to form filter cakes; and discharging the filter cakes. The method for processing paint slag muck by separating slag muck from water provided by the invention has the advantages that the water content in the paint slag muck is reduced, the influence of water content to the working condition in a kiln is reduced, the quantity of processed paint slag muck is increased, the effect of replacing some fuels by the paint slag muck is achieved, and the energy saving and emission reduction in cement production is promoted.

The invention discloses a method and equipment for preparing electroplating-grade nickel sulfate from nickel-containing wastewater produced in a surface treatment process, and belongs to the technical field of nickel-containing wastewater treatment process. The method is characterized by comprising the following steps: (1) collecting nickel-containing wastewater; (2) performing sedimentation and press filtration on nickel in the nickel-containing wastewater, and smashing nickel mud to obtain nickel slurry; (3) dissolving the nickel slurry into acid; (4) filtering a nickel sulfate solution; (5) removing impurities from the nickel sulfate solution for purification, and performing secondary filtration; (6) performing vacuum evaporative concentration, crystallization, filtration and centrifugal drying on the nickel sulfate solution to obtain nickel sulfate crystals. The invention aims to provide the method and the equipment which can reduce the waste of nickel resources, reduce potential hazard of nickel to the natural environment and realize recycling of the nickel resources and are used for preparing the electroplating-grade nickel sulfate from the nickel-containing wastewater produced in the surface treatment process. The method and the equipment are used for treating the nickel-containing wastewater.

The invention provides a preparation method of a self-bonding and pre-decomposing glass batch. The method comprises the following steps of: pre-decomposing carbonate out of a kiln so as to obtain slaked lime and periclase, then mixing with other glass batch in a proper proportion in a mixing machinery, adding 8-20wt% of water during the mixing process, then pelletizing the mixed batch, standing for more than 72hours, and hardening by hydration to finally obtain the pelletized glass batch with a certain strength. According to the preparation method, the decomposing process of the carbonate is finished out of the kiln, thus the heat consumption can be greatly reduced; the lower limit of the grain size of the raw material is not required, and thus the resource can be used furthest; the cost of the raw material is reduced by adopting the light soda ash; and the pelletizing of the glass batch can be achieved without using an external bonding agent. Therefore, the preparation method has the advantages that the melting rate is improved, the melting temperature is reduced, the melting efficiency is high, and the like.

The invention discloses an efficient domestic vacuum cleaner, comprising a vacuum cleaner body; the front end of the vacuum cleaner body is provided with telescopic connection passages, the tail end of each telescopic connection passage is connected with an arc sucker, the tail end of the other telescopic connection passage is connected with a triangular sucker, two sides of the telescopic connection passages are also provided with electric push bars, the top of the vacuum cleaner body is provided with a purifying tank, a connection block is arranged at the upper end of the purifying tank, a support bar is connected to the top of the connection block, a telescopic bar is arranged at the upper end of the support bar, the inner side of the telescopic bar is provided with a plurality of adjusting grooves, the outer upper portion of the support bar is provided with an adjusting cavity, a slider mating with the adjusting grooves is arranged in the adjusting cavity, a pull bar is connected to the outer end of the slider, a handle is connected to the outer end of the pull bar, and the pull bar is provided with a return spring. The efficient domestic vacuum cleaner is simple in structure, convenient to use and good in cleaning effect, provides efficient all-directional cleaning, has high cleaning efficiency, is capable of purifying air and is comfortable to use.

The invention belongs to the field of organic synthesis and discloses a preparation method of ethyl bromodifluoroacetate. Difluorobromoacetonitrile is taken as a raw material, and prepared through a one-pot method and subjected to alcoholysis and esterification in ethanol aqueous solution to obtain ethyl bromodifluoroacetate. According to the method provided by the invention, difluorobromoacetonitrile is taken as the raw material and then bromodifluoroacetic acid is subjected to the alcoholysis and esterification after directly hydrolyzed, without generating a toxic bromodifluoroacetyl halide intermediate, and the use of fuming sulfuric acid as an oxidant and bad in operating environments and maximum in pollution, or peroxide or ozone, or oxygen in a high pressure system to result in poor selectivity and very low yield is avoided. Furthermore, the existence of by-products with extremely strong hydrogen halide corrosion of hydrogen fluoride and the like which both have extremely large corrosion to metal and glass-lined materials is avoided in the process, so that the requirements for production reaction equipment are lowered, and the preparation of ethyl bromodifluoroacetate can be carried out in the ordinary glass-lined reaction device.

The invention relates to a steam action-based metal material surface modification method and a device therefor. The steam action-based metal material surface modification method is characterized in that according to chemical characteristics of reactions between H2O and a metal material such as Al, Mg and Ti, in the presence of saturated steam or superheated steam as an interaction medium, a functional film is in-situ synthesized on the surface of a base. The steam action-based metal material surface modification method has the obvious effects of water saving, emission reduction, environmental protection and high efficiency, utilizes water as main even only raw material, and has the advantages of zero involvement and zero discharge. The device comprises a steam generator, a steam distributor, a reaction tank, a liquid storage tank, a workpiece table and a driving motor and has the advantages of safety, reliability, simple structure, and use convenience. Through the steam action-based metal material surface modification method and the device therefor, in metal material surface modification, high-level treatment effects are obtained and potential damage produced by the prior art on the ecological environment and human health is eliminated thoroughly and cleaner production is realized really.

The invention relates to a process route for continuously synthesizing diphenylguanidine. The process route for continuously synthesizing diphenylguanidine comprises the steps of with phenylamine and cyan chloride as raw materials, continuously pressing phenylamine into a tubular reactor, and carrying out contact reaction on phenylamine and purified cyan chloride in the tubular reactor so as to synthesize diphenylguanidine hydrochloride; preparing diphenylguanidine by carrying out continuous steps of decontamination, crystallization and the like. The continuous reaction disclosed by the invention has the advantages that the reaction time is shortened, the reaction efficiency is increased, and the like.

The invention relates to a surface roughening method of a metal material. According to the method, the metal material is subjected to anodic polarization in an electrolyte; the surface roughness of the metal material is increased by the anodic dissolution effect; the electrolyte is a water-based solution of sodium chloride of 0.02 to 100 g / L; and the anodic polarization mode is to externally add current or couple a cathodic dissimilar metal material. The method has the biggest advantages of environmental friendliness, high efficiency, energy conservation and low cost.

The invention discloses a hydrodynamic self-generating ultraviolet and ozone water purification device, which comprises a micro-turbine generator, an ozone generator and a 254nm ultraviolet lamp. The micro-turbine generator is connected to a storage battery. The main body of the generator is connected to the impeller, the water outlet of the impeller chamber is connected to the water outlet through the water supply pipe, and the 254nm ultraviolet lamp is arranged in the water supply pipe behind the water outlet of the impeller chamber. The storage battery is respectively connected with the ozone generator and the 254nm ultraviolet lamp through a control switch, and the ozone output end of the ozone generator is arranged in the water supply pipe before the water inlet end of the impeller cavity. The water purification device can switch between three working states of ozone water, oxygen-enriched water, and ordinary water, and is powered by a micro-turbine generator, which is safe and energy-saving.

The invention discloses a method for preparing a soil conditioner by carrying out carbonization treatment on lake substrate sludge. The method comprises the following concrete steps: (1) taking lake substrate sludge, dehydrating until the moisture content of the lake substrate sludge is about 35 percent, entering a pelleting device to prepare substrate sludge granules with the diameter of 2-3 mm, placing the substrate sludge granules in a oven, and drying until the moisture content of the substrate sludge granules is 10-15 percent; (2) placing the dried substrate sludge granules into a carbonization furnace, and introducing vapor to substitute air in the furnace and continuously introducing vapor as protective gas; and (3) raising the temperature to 400-500 DEG C with the heating rate of 10-20 DEG C / min to carry out carbonization reaction, standing for 50-70 min, and naturally cooling to the room temperature. By adopting the invention, carbonization treatment is carried out on the lake substrate sludge, the soil conditioner with good performance can be prepared, and an approach for the reclamation, harmlessness and reduction utilization of the lake substrate sludge is provided. Harmful microbes such as various pathogenic bacterium, virus and the like in the substrate sludge can be effectively eliminated in the high-temperature process of carbonization, thereby potential hazard to the human health is eliminated. In addition, in the carbonization process, heavy metals are inactivated, thereby the pollution caused by the heavy metals is effectively controlled.

The invention relates to the construction of targeted NK cells used for tumor immunotherapy, and specifically relates to a preparation method for a membrane surface engineered NK cell, a pharmaceutical composition and an application. A targeting vector is adopted to introduce an azide group or DBCO on the surface of a NK cell, and polypeptide targeting PD-L1 can be coupled to the surface of the NKcell through copper-free click chemical reaction, so that a membrane surface engineered NK cell can be constructed. An application of the membrane surface engineered NK cell in treating PD-L1 positive tumor including head and neck squamous cell carcinoma, non-small cell lung cancer and triple negative breast cancer is also disclosed. Compared with the prior art, the preparation method has the following advantages: the targeting of the NK cell can be strengthened, so that potential hazards caused by viral vector transfection can be eliminated; the problems of CAR-T cell individualization and complex manufacturing processes can be solved; and the tumor infiltration capabilities and targeted killing activity of the NK cell can be enhanced, and immune escape mediated by a PD-1 / PD-L1 pathway can be effectively blocked, so that the membrane surface engineered NK cell has potential clinical application prospets.

The invention discloses an anti-mud amphoteric polycarboxylate superplasticizer and a preparation method thereof. The preparation method comprises the following steps: reacting 6-dimethylamino-1-hexanol with methacryloyl chloride in an organic solvent to obtain a methacrylic acid-6-dimethylaminohexyl ester intermediate, adding the methacrylic acid-6-dimethylaminohexyl ester intermediate and a polymerization inhibitor into the organic solvent, adding a 1, 3-propane sultone dropwise-adding solution, reacting, and purifying to obtain an amphoteric monomer; mixing an unsaturated polyether macromonomer, an initiator, an unsaturated carboxylic acid monomer and an amphoteric monomer, reacting, and regulating the pH value to 6.5-7.5 to obtain the anti-mud amphoteric polycarboxylate superplasticizer. Compared with a traditional anionic polycarboxylic acid water reducing agent, the mud-resistant functional monomer is introduced into the molecular structure of the prepared anti-mud amphoteric polycarboxylate superplasticizer, the sensitivity of the water reducing agent to mud is reduced, the water reducing agent does not contain chloride ions, potential hazards caused by corrosion of the chloride ions to reinforced concrete can be eliminated, the preparation method is simple, and the cost is low.

The invention provides a conformal paint coating shielding method of a circuit board, comprising the following steps: manufacturing a shielding rubber sleeve according to circuit board products of different types; and in the process of spraying and coating, sheathing the shielding rubber sleeve on certain parts, incapable of being sprayed, of the circuit board for shielding, wherein the shieldingrubber sleeve is made of anti-static rubber, and can be prevented from generating static electricity in the plugging and pulling process and further damaging electrostatic-sensitive devices on the circuit board, and the rubber sleeve is in an elastic design, is made of high-temperature-resistant inertial rubber, does not generate reaction and bonding with a conformal paint, and can be repeatedly used. The conformal coating shielding method is more suitable for devices in complex shapes of the circuit board, the electrostatic hazards can be eliminated, the efficiency is high, effective shielding can be formed, the spraying quality can be effectively guaranteed, the control is easy, and the repeated use of the rubber sleeve ensures that the cost in actual production is lowered.

The invention relates to a method for aluminum electrolysis cell waste cathode stripping treatment and fluoride recovery. The method comprises the steps that treatment is performed by adopting a large-particle waste cathode and multi-basin countercurrent leaching way for 10-14 hours; heating is performed by utilizing evaporated crystallized steam, leaching water is stirred, heat is recovered, andcondensation is performed; high-concentration fluorine-containing waste with the fluorine concentration of 16000-18000 ppm is obtained after dissolution, villiaumite is obtained through crystallization and evaporation, the evaporated water steam is used for heating, and water for leaching is stirred. The leaching efficiency of a system is remarkably improved, the water consumption and energy consumption are obviously reduced, and the problem of fluorine-containing and salt-containing wastewater discharge of the system can be thoroughly solved.

The invention relates to a generator and heat pump compound device which comprises an internal-combustion engine, a speed-transformation device, a clutch, a heat pump and a generator, wherein the internal-combustion engine is respectively connected with the heat pump and the generator by the speed-transformation device and the clutch; the fuel of the internal-combustion engine can be natural gas or biomass gas; and the heat pump can be a mechanical type vapor compression heat pump. When the internal-combustion engine runs, the heat pump and / or generator can be selectively driven by the joint or separation of the clutch so as to selectively generate power and / or supply cold and heat.

The invention provides a sampling tube fixing and sample ejecting device used for a rock-soil sample ejector and a rock-soil sample ejector facility using the device. The device has a liftable self-adaptive sampling tube fixing system, can perfectly fix sampling tubes of different diameters and can be cooperatively used with the sampling tubes of different diameters through replacing of ejecting discs of different specifications, and a specially designed structure of the device enables the inner wall of the sampling tube to be cleaned during usage. The sampling tube fixing and sample ejecting device provided by the invention can effectively reduce system height, is applicable to sampling tubes of different height, enables convenient, simple and fast fastening and connection to be realized, greatly improves efficiency and system suitability, is convenient to maintain and clean and eliminates potential risks in operation.

The invention belongs to the technical field of harmless treatment of transformer insulating oil, and particularly discloses a harmless treatment method of polycyclic aromatic hydrocarbons in transformer insulating oil. The method comprises the following steps: (1) filtering transformer insulating oil, removing oil sludge, wherein a sign for determining thorough filtration of the oil sludge is that viscous asphaltene in the transformer insulating oil disappears thoroughly; (2) determining the content of polycyclic aromatic hydrocarbons in the transformer insulating oil; (3) preparing an immobilized nanometer titanium dioxide photocatalyst, then spreading the immobilized nanometer titanium dioxide photocatalyst on a photochemical reactor with sunlight flat configuration; (4) performing photocatalytic degradation of the polycyclic aromatic hydrocarbons in the transformer insulating oil. According to the invention, harmless treatment of discarded transformer insulating oil is performed, and potential harm to human health and ecological environment caused by polycyclic aromatic hydrocarbons in the oil is eliminated.

The invention discloses a special fertilizer for olive planting and a preparation method of the special fertilizer for olive planting, which relate to the field of olive planting and belong to the field of fertilizers. The special fertilizer is characterized by comprising the raw materials in percentage by weight: 38-39% of urea (CH2N2O), 20-21% of superphosphate (Ca(H2PO4)2), 38-39% of potassium sulphate (K2SO4) and 2-3% of borax (Na2B4O7.10H2O). The special fertilizer has the beneficial effects that the fertilizer can supplement soil organic matters and increase the soil permeability after being applied in the fields, water retention, heat preservation and fertilizer maintenance conditions can be improved, olive growth result requirements are satisfied, and the special fertilizer has high yield and high production benefit.

The invention provides a catalyst for decomposing hydrogen peroxide. The catalyst for decomposing hydrogen peroxide is characterized by being prepared from, by mass, 1%-30% of VI B-group metal oxide, 1%-20% of IV B-group metal oxide and 50%-98% of III A-group metal oxide. According to a method for decomposing hydrogen peroxide in a product of an epoxidation reaction of 3-chloropropene and hydrogen peroxide by adopting the catalyst, most residual hydrogen peroxide in the product of the reaction can be decomposed before distillation separation, potential hazards of the high hydrogen peroxide content in the product of the epoxidation reaction to the follow-up distillation separation process are effectively eliminated, and therefore the safety of producing epoxy chloropropane through the epoxidation reaction of 3-chloropropene and hydrogen peroxide is improved.

The present invention provides an essence liquid and a mask liquid and a preparation method thereof, according to the method, biological macromolecules of a placenta can be powerfully hydrolyzed by strongly-polar small molecule group water, introduction of pollutants due to use of strong acid and alkali for hydrolysis in the prior art can be avoided, biological activity of placental small molecule matters can be retained in the finally-obtained placenta hydrolysis ultrafiltrate, free hormone components in the placenta are eliminated, the potential harm of the free hormone disrupting normal human endocrine function can be eliminated, and the skin-care essence liquid and the mask liquid and other skin-care production prepared from the placenta hydrolysis ultrafiltrate with the molecular weight of 1KD to 10KD have the effects of nourishing skin cells, promoting the growth and regeneration of the skin cells, promoting skin collagen formation and preventing skin melanin formation, do not contain any cortical hormone, may not hurt skin cells after long-term use, and have obvious effects of removing freckles, resisting wrinkle and tendering the skin.