63results about How to "Maintain pH value" patented technology

The invention discloses an environmentally-friendly and long-lasting fire-retarding treatment method for all-cotton knitted fabrics, which adopts a processing flow comprising padding, low-temperature drying, high-temperature drying, washing with water, drying and softening and deodorizing. In the invention, an Aflammit KWB fire retardant is used, processing is performed on the conventional dyeing and finishing equipment, and the products have higher fire-retarding performance due to the combination of the fire retardant and cotton fibers by covalent bonds and offer a soft handfeel and are more in accordance with an environment protection requirement. The products produced by the process offer a soft handfeel, the fire-retarding effect after 50 times of washing with water reaches American CFR1615 standards, the formaldehyde content is lower than 20ppm, the products are more environmentally-friendly and have no irritating smell.

The invention relates to a large-scale pig farm wastewater treatment method comprising anaerobic fermentation, filtering, regulating pool treatment, primary precipitation, anaerobic pool treatment, secondary precipitation, A / O pool treatment, precipitation of secondary sedimentation tank, flocculent precipitation treatment, final precipitation treatment and disinfecting tank treatment. The treatment method provided by the invention is simple in treatment procedures, low in treatment cost and strong in treatment ability, thereby being suitable for popularization and application of large-scale pig farm wastewater treatment.

The invention belongs to the technical field of plant cultivation, and in particular relates to the technical field of kalanchoe blossfeldiana cutting. A cutting method of kalanchoe blossfeldiana is characterized in that: kalanchoe blossfeldiana cuttings cut from the whole kalanchoe blossfeldiana are cut into a paper pot made from rice hulls, and are transplanted to a big pot after 1 week of growth, and the temperature is controlled to be between 18 and 22 DEG C and humidity is controlled to be between 60 and 70 percent. By the cutting method, nutrients which are needed in the cutting process can be effectively provided, and a pH value of soil is maintained; meanwhile, the paper pot made from the rice hulls is degradable to achieve the effect of environmental protection, so that the survival rate of cutting is improved, and plant height and crown diameter are increased.

The invention discloses a method for preparing anti-viral oral liquid and a product thereof. The method is characterized in that the pH value of the oral liquid is stabilized at 5.5 to 6; and preferably, the pH value is stabilized in the range by adding a buffer salt. The preparation method for the product is completed, and the effect of the product is improved; and the clarity of the oral liquid can be effectively kept for a long term, and the pH value of the oral liquid and the stability of the forsythin content are effectively improved.

The invention relates to a water- brone alkyd resin emulsion with distinctive storage performance. The emulsifying resin (A) and alkyd resin (B) with acid value less than 5mg / KOH / g are mixed according to weight ratio of 3: 1- 1: 3, water is added slowly and at the same is stirred at high speed for dispersion. The emulsifying resin (A) is produced through polymerization with polyurethane resin (A1) with theoretical acid value being 20- 45 mg KOH / g, and alkyd resin (A2) with its acid value no more than 5 mg KOH / g and hydroxyl value no less than 30 mgKOH / g according to proportion of 1:1 - 1:3 and neutralization with volatile amine. The emulsion can be prepard into air oxidation dried coating or baked coating, suitable for normal industrial protective coating or domestic coating field. It can be used as surface coating and bottom coating.

A special adhesive for vegetable fiber elastic material consists of natural latex 90-110 proportion, water 100-115 proportion, vulcanizing agent 2-3 proportion, improver 0.5-2.5 proportion, stabilizer 0.5-1.5 proportion, dispersant 0.5-2 proportion, penetrating agent 0.2-1.5 proportion, activator 2-2.5 proportion and anti-ageing agent 1.5-3 proportion. A special adhesive for vegetable fiber elastic material is added in various stabilizer, dispersant, penetrating agent, vulcanizing agent, improver, activator, anti-ageing agent, water-softening agent, filler and thickener into latex. It has better mechanical stability, bonding strength and product quality, long elasticity and it costs low.

The invention relates to dry goods digital printing reactive dyeing jet ink. Its component weight percentage are as follows: dye 1-10%, humectant 10-15%, scale remover 1-5%, bactericide 0.2-1%, pH value control agent 1-5%, penetrant 0.5-5%, rest deionized water. Its production technique includes the following steps: mixing them at normal temperature; fully stirring for 0.5-1hours; standing the mixed solution at 50-70 centigrade degree for 24-48 hours to gain curing mixed solution; filtering the cured mixed solution orderly through 1 micron, 0.5 micron, 0.22 micron filter membrane. The invention can be applied in paper printing, also can be used as dry goods digital printing reactive dyeing jet ink.

The invention relates to a process for preparing poly-diallyldimethyl ammonium chloride which comprises the steps of, (1) using alkali carbonate and complexing agent mixed solution as decontaminating agent for one time or multiple scouring to the allyl chloride, (2) dropping dimethylamine solution and alkali metal hydride solution into the allyl chloride solution, charging catalyst, (3) controlling the temperature between 40-70 deg. C, the reacting time being 2-4 hours, pumping water and low-boiling-point substance through decompression, obtaining DADMAC, (4) charging initiating agent into DADMAC solution, adjusting the pH value to 6, performing auto-polymerization at atmospheric temperature.

The invention discloses an acid gas purification device, comprising a box, wherein a spacer plate is arranged in the box, the upper end of the spacer plate is provided with a purification cavity, the lower end of the spacer plate is provided with a gas inlet cavity, the left side of the gas inlet cavity is provided with a gas inlet pipe, the gas inlet pipe is provided with a high-pressure pump, a fixing sleeve is vertically fixed to the middle postion of the upper end of the spacer plate, upper and lower through openings are formed in the fixing sleeve, an inner cavity of the fixing sleeve is communicated with the gas inlet cavity, a drive shaft is arranged in the fixing sleeve in a penetrating way, the fixing sleeve is provided with a No. 1 rigid bearing matched with the drive shaft, the upper end of the drive shaft penetrates through the upper end of the box, and is connected with an output end of a drive motor, a gas guide passage is arranged in the drive shaft, and a lower end opening of the gas guide passage is communicated with the gas inlet cavity. The acid gas purification device is simple and reasonable in structure, rotational gas injection is realized, thus a contact area between injected gas and purifying liquid is increased, when bubbles float upward, the mixing degree of waste gas and the liquid can be further increased by stirring wires and a stirring screen, thus the purification effect of the device is greatly improved, and the practicability is high.

The invention provides a multifunctional elbow joint replacement prosthesis which comprises a humerus assembly, an ulna assembly, a radius assembly and a pin shaft assembly. The humerus assembly comprises a humerus handle, a yoke and a capitulum humeri. The ulna assembly comprises an ulna handle, an ulna neck and an ulna head. The radius assembly comprises a radial head and a radial bone marrow needle. The pin shaft assembly comprises a pin shaft outer nail of a hollow barrel structure and a pin shaft inner nail inserted into the pin shaft outer nail. One end of the pin shaft inner nail is provided with an anti-disengagement piece used for preventing the whole pin shaft inner nail from entering the pin shaft outer nail. The other end of the pin shaft inner nail is provided with a locking piece. The pin shaft assembly enables the ulna assembly to pivot around a shaft and fixes the capitulum humeri to a first convex lug. The multifunctional elbow joint replacement prosthesis accords with human body daily behavior movement characteristics, has the good stability and safety, can achieve partial replacement or whole replacement, improves biocompatibility with the sclerotin, and is not likely to cause looseness or infection or instability or other complications and long in service life.

The invention discloses a preparation method of porcine parvovirus genetic engineering vaccine, which comprises the following steps: constructing and recombining a yeast expression carrier p GAPZ alpha-VP2; then carrying out electric shock to convert pichia pastoris SMD1168, so that VP2 protein is efficiently secreted and expressed in a YPD culture medium to form viruslike particles without virusnucleic acid; purifying protein, carrying out SDS-PAGE and Western Blot and electric microscope detection; and adding a corresponding immunologic adjuvant to prepare the porcine parvovirus genetic engineering vaccine. The porcine parvovirus genetic engineering vaccine prepared by the invention solves the defects in the current porcine parvovirus genetic engineering vaccine, can be used for preventing and treating porcine parvovirus genetic infection and relative diseases caused by the porcine parvovirus genetic infection, and is also suitable for preparing and detecting the envelope antigen of a porcine parvovirus antibody ELISA kit.

The invention provides a preparation method of a spherical gold nanoparticle. The method is characterized by comprising the following steps: 1, dissolving fructose in deionized water to obtain a fructose water solution; 2, dissolving chloroauric acid crystal in the deionized water to form a chloroauric acid solution; 3, heating the fructose water solution to boiling, then adding the chloroauric acid solution, keeping reaction in the boiling state for 5-10min, and keeping the PH value of the reaction system between 4.0-5.5; 4, obtaining a reaction solution after the reaction is completed; 5, carrying out centrifugal separation on the reaction solution so as to obtain a precipitate; and 6, drying the precipitate so as to obtain the spherical gold nanoparticle. According to the preparation method of the spherical gold nanoparticle, the fructose is used as a reducing agent and a dispersing agent, is convenient and easy to obtain and is free of toxicity, the price of the fructose is low, and the fructose is used as the reducing agent to replace a conventional chemical reagent, no toxic chemical reagent residue is generated on the surface of the obtained spherical gold nanoparticle, and the spherical gold nanoparticle shows an obvious optical signal.

Reactive dye ink-jetting ink for textile digital printing is disclosed. The ink includes, by weight, (a) 1-10% of dye, (b) 10-15% of a humectant, (c) 1-5% of an anti-scaling agent, (d) 0.2-1% of a sterilizing agent, (e) 1-5% of a pH value controlling agent and (f) 0.5-5% of a penetrant, with the balance being deionized water. The invention also discloses a production process of the ink. The process includes (A) mixing the dye, the humectant, the anti-scaling agent, the sterilizing agent, the pH value controlling agent, the penetrant and the deionized water at room temperature, and fully stirring the mixture for 0.5-1 h to obtain a mixed solution; (B) allowing the mixed solution to stand at 50-70 DEG C for 24-48 h to cure the mixed solution to obtain a cured mixed solution; and (C) filtering the cured mixed solution by filtration membranes having sizes of 1 micron, 0.5 micron and 0.22 micron in order to obtain a final product. The ink can be applied in paper printing, and can be adopted as the reactive dye ink-jetting ink for textile digital printing.

The invention relates to a treatment method and treatment device of sulfuric acid wastewater in a production process of polyphenylene terephthalamide fibers, belongs to the field of chemical engineering, and particularly relates to a sulfuric acid wastewater treatment technology. The main points of the treatment method are as follows: coagulation bath waste liquid, fiber water washing waste liquid and fiber neutralizing waste liquid generated in the production process of the polyphenylene terephthalamide fibers are mixed in a static mixer and introduced into a waste liquid storage tank; the wastewater in the waste liquid storage tank is pumped to a neutralizing reaction kettle through a centrifugal pump and neutralized by calcium hydroxide until the PH value is 6-9; and the neutralizing waste liquid in the neutralizing reaction kettle is conveyed to a plate and frame filter through the centrifugal pump for filtering, the filtrate is discharged as industrial wastewater, and the filter residues are unloaded to a filter residue hopper. The treatment device comprises the neutralizing reaction kettle and the plate and frame filter. The treatment method and treatment device provided by the invention have the positive effects that: a continuous treatment device for a large amount of sulfuric acid wastewater generated in large-scale continuous preparation of polyphenylene terephthalamide fibers is provided; and one set of simple treatment system is used, the cost is saved, and the operation is convenient.

Disclosed is animal biotin special for broilers and a preparing method thereof. The animal biotin is characterized in that the preparation materials comprise the components of feed grade fulvic acid, dandelion general flavones and fenugreek meal fermentation culture; the fenugreek meal fermentation culture comprises fenugreek substrate and inoculated liquid, wherein the fenugreek substrate comprises fenugreek meal, corn flour and beet molasses; and the inoculated liquid comprises saccharomyces cerevisiae, lactobacillus plantarum, bacillus subtillis and bacillus licheniformis, wherein the total quantity is 10x10<8> cfu / g, the total quantity of lactobacillus plantarum and bacillus subtillis is 5x10<8> cfu / g, saccharomyces cerevisiae accounts for 3x10<8>cfu / g, and lactobacillus plantarum accounts for 2x10<8> cfu / g. According to the animal biotin special for broilers, digestive systems and immune systems of animals can be repaired, regulated and stimulated to achieve effects of growth promotion, immunity enhancing, disease prevention and resisting and improvement of animal product quality. The animal biotin special for broilers is a natural green product without any hormone.

The invention relates to a special animal biogen for laying hens and a preparation method of the special animal biogen. The special animal biogen comprises the following ingredients: feed grade fulvic acid, dandelion general flavone and bitter soybean meal fermentation culture, wherein the bitter soybean meal fermentation culture comprises bitter soybean meal substrates and inoculation liquid, the bitter soybean meal substrates comprise bitter soybean meal, corn flour and beet molasses, the inoculation liquid comprises saccharomyces cerevisiae, lactobacillus plantarum, bacillus subtillis and bacillus licheniformis, wherein the total sum of the viable bacterium number of the saccharomyces cerevisiae, the lactobacillus plantarum, the bacillus subtillis and the bacillus licheniformis is 1*10<8>-10*10<8> cfu / g, the total sum of the viable bacterium number of the bacillus subtillis and the bacillus licheniformis is 2*10<8>-6*10<8> cfu / g, the viable bacterium number of the saccharomyces cerevisiae is 3*10<8>-7*10<8> cfu / g, and the viable bacterium number of the lactobacillus plantarum is 0.5*10<8>-2*10<8> cfu / g. The effects of promoting the growth, improving the immunity, preventing and resisting diseases and improving animal product quality are reached through restoring, regulating and exciting the digestive system and the immune system of animal bodies per se. The special animal biogen belongs to a natural green product without any hormone.

The invention belongs to the technical field of ore dressing and particularly relates to a sulfide-oxidized mixed ore treatment process. The sulfide-oxidized mixed ore treatment process includes three sections namely ore grinding and classification, cyanidation leaching and magnetic separation. Due to high sulfur content in treated sulfide-oxidized mixed ore, a great quantity of lime is added at the ore grinding and classification section to accelerate oxidation of sulfide ore in advance, and a PH value in ore pulp can be constantly kept in a range of 10-12 to achieved a protection alkali function; during secondary grinding, sodium cyanide is removed to avoid reaction between sodium cyanide with sulfide ore in the sulfide-oxidized mixed ore, sodium cyanide consumption is reduced, and production cost is saved; oxygen-rich leaching is adopted at the cyanidation leaching section, and an oxygen-rich environment accelerates sulfide ore oxidation to realize passivation in sodium cyanide solution, so that reaction with sodium cyanide is avoided, and unit consumption of sodium cyanide is reduced; by preparation of the oxygen-rich ore pulp high in cyanide content, the leaching rate of metals such as gold and silver is increased, pulp volume is decreased due to high-concentration leaching, and sodium cyanide consumption is reduced.

The invention relates to an electrophoretic coating device, in particular to an automatic on-line analysis electrophoresis tank. The automatic on-line analysis electrophoresis tank comprises a main tank, wherein a liquid outlet and a liquid return port are formed in the main tank, a circulating pipeline connected to the liquid outlet and the liquid return port is arranged outside the main tank, and a circulating stirring pump is arranged on the circulating pipeline; the automatic on-line analysis electrophoresis tank is characterized by further comprising an assay analysis tank, wherein a liquid outlet pipeline is connected between the assay analysis tank and the main tank, and an electromagnetic valve is arranged on the liquid outlet pipeline; a concentration sensor is arranged in the assay analysis tank, and the concentration sensor is connected to an electric controller through a wire; and the electromagnetic valve is connected to the electric controller through the wire. Accordingto the automatic on-line analysis electrophoresis tank, the components of the electrophoretic paint in the main tank can be automatically analyzed, manual sampling is not needed, the production line is not need to stop, the production efficiency can be improved, and the labor cost can be reduced.

The invention discloses a preparation method for extracting amino acids from alfalfa, and belongs to the technical field of amino acid extraction. The preparation method for extracting the amino acidfrom the alfalfa comprises the steps of 1, vacuum dehydration, wherein the alfalfa stem and leaf parts without edible value are put into vacuum dehydration equipment for vacuum dehydration drying, anddry matter is obtained; 2, wall-breaking crushing, wherein the dry matter in step 1 is subjected to wall-braking crushing, and crushed matter is obtained; 3, ultrasonic extraction, wherein the crushed matter in step 2 is added into ultrasonic extraction equipment, and continuous extraction is conducted to obtain non-target product crude fiber and extraction liquid; 4, protein decomposition. Accordingly, various amino acids can be extracted from alfalfa stems and leaves without the edible value, the agricultural benefit is greatly improved, the preparation method is simple, industrialization is easy, and the technical gap of extracting various amino acids from the alfalfa stems and leaves in China is filled up.

The invention provides a capitulum radius replacement prosthesis. The capitulum radius replacement prosthesis comprises a capitulum radius and a radius broach, wherein the capitulum radius is in the shape of a circular truncated cone, the end face of the large-diameter end of the capitulum radius serves as the articular surface and is sunk inwards to form a spherical articular cavity, and the sphere center of the spherical articular cavity is located on the axis of the radius broach; a round connecting plane is arranged at the end of the radius broach, the diameter of the connecting plane is identical with that of the small-diameter end of the capitulum radius, and the small-diameter end of the capitulum radius is connected with the connecting plane of the radius broach through a connecting part in a matched mode. The capitulum radius replacement prosthesis accords with human anatomy and daily performance kinetic characteristics and has high stability and safety. Through the improvement of bone cement constituents, biocompatibility between the capitulum radius replacement prosthesis and bone substances is improved, complications such as deviation, looseness, infection and instability do not occur easily, service life is long, and different connecting parts can be adopted according to the conditions of patients to guarantee the optimal using effect of the capitulum radius replacement prosthesis.

The invention discloses a fertilizer capable of increasing the amino acid content of crops. The fertilizer capable of increasing the amino acid content of the crops comprises 15 parts of an amino acidaqueous solution, 15 parts of an alkaline solution, 15 parts of crop straw, 25 parts of rapeseed meal, 65 parts of urea, 5 parts of chitin, 20 parts of animal waste, 10 parts of ammonium sulfate, 10parts of alfalfa meal, 10 parts of river algae, 2 parts of humic acid, 20 parts of sludge and 3 parts of an organic fertilizer leavening agent. According to the fertilizer capable of increasing the amino acid content of the crops, the effects that the injection amount is accurately controlled when the alkaline solution is injected through cooperative use of the liquid outlet box and the air spring, and it is ensured that the PH value of amino acid hydrolysate is in the standard size are achieved.

The invention relates to a nanopigment digital printing ink-jet ink, which consists of the following components: nanopigment dispersion color paste; humectant; descaling agent; bactericidal agent; control agent for PH value; surface activator; resin and deionized water. The manufacturing technique includes the following steps: (A) predispersing and grinding the pigment according to the fineness requirement to less than 200 nanometers of D90 to prepare nanopigment dispersion color paste; (B) mixing humectant, descaling agent; bactericidal agent, control agent for PH value, surface activator, resin and deionized water at the normal temperature and sufficiently stirring to obtain the mixed solution; (C) adding the nanopigment dispersion color paste into the mixed solution obtained by step (B) and sufficiently stirring to obtain mixed solution; (D) stewing and curing the mixed solution obtained by step (C) to obtain the aged mixed solution; (E) filtering the aged mixed solution obtained by step (D) by filter membrane to obtain the end product.

The invention relates to a mine waste water intelligent treatment device and method. The device comprises a filter tank, a heavy metal settling tank, an organic matter removing tank, a sterilizing tank, a PH regulating tank and a water storage tank, wherein a first branching tank, a second branching tank and a third branching tank which are connected with a water source are respectively arranged in the filter tank; an outlet of the first branching tank, an outlet of the second branching tank and an outlet of the third branching tank are connected with the heavy metal settling tank; an alkali liquor adding tank is arranged above the heavy metal settling tank; an alkali liquor outlet is formed in the bottom surface of the alkali liquor adding tank; an outlet of the heavy metal settling tank is connected with the organic matter removing tank; an activated carbon adsorption layer is arranged in the organic matter removing tank; an outlet of the organic matter removing tank is connected with the sterilizing tank; an outlet of the sterilizing tank is connected with the PH regulating tank; an acid liquor adding tank is arranged above the PH regulating tank; and an outlet of the PH regulating tank is connected with a water storage tank. The method is compact in step, mine waste water can be treated, the treated mine waste water can be drained directly, and can also be reused, the treatment efficiency is high, meanwhile, the treatment effect is good, and harm to the environment is reduced.

The invention discloses a mixed ion exchange resin capable of adjusting a PH value of effluent. The mixed ion exchange resin is formed by mixing acidic resin with basic resin in certain proportion; the PH value of the effluent is controlled to be within a required range while ion exchange is performed on raw water to be treated. The volumetric ratio of the acidic resin to the basic resin is 1: 0.8 to 1:6, and the PH value of the effluent is 7.5+ / -1. The acidic resin is strong acid cation resin or weak acidic cation resin. The basic resin is strong basic anion resin or weak basic anion resin. According to the mixed ion exchange resin disclosed by the invention, the quality of the effluent can be realized, and the PH value of the effluent can be kept within the required range.

The invention relates to the technical field of microorganism extraction, in particular to chondroitin sulfate extraction equipment which comprises a reaction cylinder, the reaction cylinder is supported by four supporting columns, a partition plate is slidably connected into the reaction cylinder, a through hole is formed in the position, close to the circle center, of the partition plate, the interior of the reaction cylinder is divided into an upper cavity and a lower cavity by the partition plate, a supporting rod is fixedly connected to the inner wall of the reaction cylinder and penetrates through the lower surface of the partition plate, and the outer surface, located below the partition plate, of the supporting rod is sleeved with a supporting spring; and an extraction mechanism is arranged on the outer surface of the reaction cylinder and is used for extracting a solution. A solution at the bottom of the reaction cylinder is extracted through a liquid extraction pipe, reactants are sequentially added into the solution, the pH value of the solution is detected, the pH value of the reacted solution is sampled and detected in real time through a sampling mechanism, and it is guaranteed that the pH value of the solution is always within a stable range.

The invention relates to traditional Chinese medicine vagina contracting gel and a preparation method thereof. The traditional Chinese medicine vagina contracting gel is prepared from the following raw materials: matrine, herba centellae, rhizoma bletillae, herba cistanches, herba lycopi, semen leonuri, herba saussureae cum flore, collagen, hyaluronic acid, borneol, carbomer, triethanolamine and purified water; a base material is developed by utilizing a bionics principle according to characteristics of human bodies; the pH (Potential of Hydrogen) value and components are similar with female vagina secreted fluid; bionic liquid as a base material is used as a carrier; Chinese herbal medicines are subjected to water extraction, alcohol precipitation and secondary inclusion and then are hot-melted with the emulsified base material according to a certain ratio, and a mixture is condensed to obtain the product. The technology provided by the invention can sufficiently keep the activity ofthe Chinese herbal medicines, and also can realize slow release, controlled release and sufficient absorption effects, and damaged collagen fibers, elastic fibers and the like are retracted and recombined, so that a vagina wall is thickened and tightened, the compactness, the sensitivity and the lubrication degree of a vagina are remarkably enhanced and the vagina is as tight as before.

The invention relates to the field of chemical industry and in particular to a method for preparing nano calcium sulfate. The method comprises the following steps: adding a crystal form control agent into refined lime milk to produce a CaSO4 crystal nucleus, and fully emulsifying the lime milk; atomizing the lime milk to be sprayed into an absorption tower, introducing sintering flue gas and cool-humidified oxidation air into the absorption tower, thereby obtaining gypsum slurry, wherein the sintering flue gas needs to be subjected to dust extraction and purification and cooling humidification before introduction; adding a modifier into the gypsum slurry for performing surface modification treatment, so that the surface of the produced CaSO4 powder is hydrophobic; and preparing nano calcium sulfate through the gypsum slurry subjected to surface modification treatment. The nano calcium sulfate is directly produced by utilizing SO2 in the sintering flue gas, so that the environmental pollution problem is solved, and a comprehensive resource utilization aim is achieved.

The invention provides hydrogen ion enriched acidic conservation contraception gel for department of gynecology and a preparation method of the hydrogen ion enriched acidic conservation contraceptiongel, and relates to the technical field of medical health. The preparation method comprises the steps of performing wetting and dispersing on an ammonium acryloyldimethyltaurate / VP copolymer with glycerin or propylene glycol to form paste, mixing the paste with a saturated hydrogen-enriched aqueous solution, and performing standing until the ammonium acryloyldimethyltaurate / VP copolymer presents expansional state, so as to obtain a glue solution; mixing lactic acid with glycollicacid, citric acid, lactein, calcium propionate, ferment, active VC, glutathione GSH and the saturated hydrogen-enriched aqueous solution to obtain a mixed solution; and then uniformly mixing the mixed solution with the glue solution, and adjusting the pH value to 3.8-4.0 so as to obtain the hydrogen ion enriched acidic conservation contraception gel. The hydrogen ion enriched acidic conservation contraception gel disclosed by the invention does not destroy beneficial bacteria in the vagina, and does not have any side effects; the pH value of products is completely consistent with the normal pH value of the vagina; the vagina mucosa can be urged to be young, and the disease resistance can be improved; and the hydrogen ion enriched acidic conservation contraception gel can restrain breeding of pathogenic bacteria, prevent vagina infection, restrain capacitation and sperm activity, and exert the contraception effects.

The invention discloses a method to prepare high-disperse nano SiO2, imputting O2-H2 organic halogen silane in a certain proportion into reaction room to make burning reaction, at the same time inputting a protective gas, vapor and inert gases, adopting the produced water and heat to make high-temperature hydrolytic condensation reaction and making the late process such as aggregative gas-solid separation deacidification on the reaction product to obtain it, primary particle dimaeter 7-40 nm, ratio surface area 100-400 m2 / g, pH value 3.8-4.5, SiO2 receiving rate >99%.

The invention belongs to the technical field of medical rubber mats, and particularly relates to a rubber mat for reducing occurrence of pressure sores during use of a non-invasive ventilator. The rubber mat includes a hydrogel layer, a penetration absorbent and buffer layer and a breathable and water barrier layer, one side of the penetration absorbent and buffer layer is closely attached to thehydrogel layer, the other side of the penetration absorbent and buffer layer is closely attached to the breathable and water barrier layer. According to the rubber mat, the rubber mat is prepared in ashape corresponding to a mask and placed in the mask, direct contact between the mask and skin is avoided, because the rubber mat is smooth, soft and good in breathability, pressure of the mask on the skin can be reduced, and free breathing of the skin can also be protected; in addition, the rubber mat can effectively absorb skin secretion, the skin PH value is maintained, the moderate temperature is maintained, and thus the occurrence of the pressure sores is prevented; and the comfort and compliance of patients receiving non-invasive ventilation treatment can be improved.