248 results about "Methyl p-hydroxybenzoate" patented technology

The invention specifically discloses a composite whitening and spot correcting lotion, and a manufacturing method thereof. The spot correcting lotion is manufactured from raw materials of, by weight: 2.5 to 25 parts of traditional Chinese medicine active site extracts, 0.5 to 5 parts of arbutin, 0.05 to 0.2 parts of sodium hyaluronate, 5 to 10 parts of soybean fermentation extract, 1 to 10 parts of 1,3-butylene glycol, 1 to 10 parts of propylene glycol, 0.2 to 0.8 parts of tween-80, 0.1 to 0.4 parts of methyl-p-hydroxybenzoate, 0.1 to 0.4 parts of propylparaben, 0.5 to 5 parts pf ethanol, and 33.2 to 89.05 of deionized water. The traditional Chinese medicine active site extracts comprise raw materials of, by weight: 5 to 15 parts of ginseng, 5 to 20 parts of mongolian milkvetch root, 5 to 25 parts of white peony root, 5 to 30 parts of licorice, and 5 to 35 parts of cottonrose hibiscus flower. According to the composite whitening and spot correcting lotion provided by the invention, a plurality of traditional Chinese medicine active components are added to whitening and spot correcting active substances, such that the activity of tyrosinase can be effectively inhibited, oxygen-derived free radicals can be removed with high efficiency, and melanin can be prevented from appearing. With the composite whitening and spot correcting lotion, various freckles and chloasma can be comprehensively and rapidly corrected. Also, the lotion brings no toxin or harm.

The invention discloses a skin base solution and a preparation method thereof, belonging to the field of cosmetics. The skin base solution comprises deionized water, xanthan gum, 1,3-propanediol, 1,3-butanediol, sodium pyrrolidonecarboxylate, sodium hyaluronate, ethylene diamine tetraacetic acid, allantoin, methyl-p-hydroxybenzoate, polyoxyethylene (40) hydrogenated castor oil, phenylpropanol, apple stem cell essence, alpine rose stem cells, platinum matrix-EM, lipidure pmb, cactus stoste and rose damascus essential oil.. Active substance essences in the formulation can excite activity of a specific gene again, thereby promoting synthesis of repairing protein. After the skin base solution is used, people's skin becomes fine and smooth and is more uniform and is remarkably improved.

The invention discloses an amino acid cleansing cream and a preparation method thereof. The amino acid cleansing cream comprises the following components in percent by weight: 3-8 percent of glycerol, 0.05-0.2 percent of hydroxyethylcellulose, 5-13 percent of propylene glycol, 25-30 percent of sodium lauroyl glutamate, 5-8 percent of sodium cocoyl glutamate, 0.5-1.5 percent of ethal-octadeca-composite fatty alcohol, 0-2 percent of ethylene glycol distearate, 0.2-0.6 percent of cetearyl alcohol ether (20), 0.5-1.5 percent of cocoaminopropyl dimethyl betaine, 0.5-1.5 percent of cetearyl alcoholether-60 myristyl glycol, 1-3 percent of acrylate / polyoxyethylene-20 stearin alcohol ether methacrylate copolymer, 0.4-0.8 percent of citric acid, 0.1-0.2 percent of diazolidiny urea, 0.10-0.15 percent of methyl phydroxybenzoate and the balance of deionized water. the amino acid cleansing cream has better stability and solid content of sodium lauroyl glutamate of more than or equal to 25 percent,and can create a comfortable and clear microenvironment for healthy growth and metabolism for skin cells on the face.

The invention relates to a multifunctional cleaning cream for stain removal and sterilization and a preparation method thereof. The cleaning cream is prepared from the 30-80 parts of coconut oil, 5-10 parts of sodium hydroxide, 40-80 parts of distilled water, 30-50 parts of anhydrous ethanol, 60-100 parts of olive emulsifier, 3-5 parts of silicon oil, 5-10 parts of glycerol, 5-10 parts of natural beeswax, 5-10 parts of carnauba wax, 1-3 parts of cocoyl amido propyl betaine, 1-16 parts of Chinese soapberry extracting solution, 1-10 parts of saponin extracting solution, 1-3 parts of alkyl glycoside, 0.5-1 part of ethyl methyl p-hydroxybenzoate and 0.05-0.25 part of essence. The cleaning cream is milk white, and has the advantages of proper hardness, smooth surface, high fineness and uniformity, favorable spreadability, favorable stability and fragrant smell.

The invention relates to liquid crystal epoxide resin wit branch chain, its (1) is shown at the right: R is alkyl containing 1-16 carbon atom, m=1-10, also it relates to the method to prepare the compound, the combination and its application. The invention has the characteristic that the product etherealized and then esterified of methyl p-hydroxybenzoate and alkenyl alkyl halide has reaction with the product of 2,5-dihydroxy-benzoic acid and alkyl alcohol or alkyl halide, the compound generated then reacts with peroxiding agent, making the liquid crystal epoxide resin with branch chain, and the productivity is as high as 70-85%, much higher than the conventional dirct esterification method. The invention has the performance of liquid crystal, and lower melt point than that without branch chain, can be solified by many curing agent in lower temperature for producing electronic enclosing material and shape-mambering material with outstanding performance.

The invention relates to cortex mori anti-aging face cream. Each part of face cream comprises the following components: olive oil, apricot kernel oil, glyceryl monooleate, sorbitan sesquistearate, glycerol alpha-tocopheryl, cortex mori extracts, hyaluronic acid, essence, methyl p-hydroxybenzoate and refined water; and after a face is washed, the cortex mori anti-aging face cream is directly applied to the face. The cortex mori anti-aging face cream can resist skin aging and slow down wrinkles and colored patches on the face skin and is not used with astringent containing alcohol components.

The invention discloses a preparation scheme and method of citrus fruit fly larva feed. Artificial feed is one of effective approaches for obtaining high-quality fruit flies for experimenting. Each part of feed internally contains 3.0-9.5g of yeast powder, 10.0-11.5g of cane sugar, 2.0-9.0g of wheat bran powder, 15.0-20.0g of wheat bran, 0.10-015g of sodium benzoate, 0.10-0.15g of methyl p-hydroxybenzoate, 0.5-0.8g of citric acid and 50-80ml of water. The scheme is improved on the basis of a foreign authoritative formula through sufficiently considering the material quality and nutrition problems; feeding evaluation indexes such as larva-to-pupa proportion, eclosion rate, larva and pupa calendar period and pupa weight are all relatively ideal; and the preparation scheme has the characteristics of low cost, easiness for obtaining raw materials, simplicity in preparation and the like.

The invention relates to an antistaling agent prescription for preserved dried turnip and process, which comprises ozonization, regulating pH, integrating the complementary actions of bacterium inhibiting spectrum of different preservatives, controlling microbiological putridness and gas production in the vacuum-packing. The formulation of the antistaling agent comprises sodium dehydroacetate, methyl-p-hydroxybenzoate mixed ester, fumaric acid, citric acid, edible ethanol and Cinnamomum cassia extract.

The invention discloses a nanometer normal temperature antistaling agent for vegetables and fruits and process for preparation. The current nanometer normal temperature antistaling agent for vegetables and fruits has the possibly of polluting food and the cost is high. The antistaling agent of the invention comprises raw materials with the following weight percent, nanometer titanium oxide 0.5-10%, nanometer silver titanium 0.01-1%, antonite 5-20%, the mixture of methyl-p-hydroxybenzoate and propyl p-hydroxybenzoate 0.05-1%, ferrous powder 1-5%, cinnamic aldehyde 0.001-0.01%, activated char 2-7%, and the others are carriers. The antistaling agent has a comprehensive formulation, and has the advantages of excellent bacteria-inhibiting and fresh-keeping effects, low cost and no pollution to vegetables and fruits, and is safe to be used.

The invention discloses a skin base liquid having a micro-ecological balance self-repairing function. The skin base liquid comprises, by weight, 0.05-0.1% of sodium hyaluronate, 0.05-0.2% of carbomer, 0.05-0.2% of triethanolamine, 0.05-0.1% of disodium ethylenediaminetetraacetate, 1.5-2.5% of lubrajel oil, 0.05-0.1% of methyl p-hydroxybenzoate, 2-3% of apple fruit cell culture extract, 0.5-1% of glycerol glucoside, 2-3% of ganoderma lucidum extract, 2-5% of palmitoyl tripeptide-5, 2-5% of alpha-arbutin, 0.5-1% of dendrobium officinale extract, 0.5-1% of caprylhydroxamic acid and 0.5-2% of azone. The skin base liquid can effectively repair cell damage, promote cell metabolism, make dark and uneven color skin bright and moist and make skin fine, soft and youthful.

The invention provides a preparation method of mythyl p-hydroxybenzoate molecular imprinting composite membrane and application thereof. A molecular imprinting composite preparation method and an application of mythyl p hydroxybenzoate in separation of methyl salicylate belong to the fields of material preparation technology and separating technology. polyvinylidene fluoride micro filter membrane is used as a substrate, and mythyl p-hydroxybenzoate (MP) which is impurity in methyl salicylate is used as a template molecule, and methacrylic acid (MAA) is used as a functional monomer, and N, N'-methylene bisacrylamide (MPAA) is used as a cross-linking agent, and azodiisobutyronitrile (AIBN) is used as an initiator; preparation of mythyl p-hydroxybenzoate molecular blotting membrane (MIMMP), static adsorption experiment and selective penetration experiment are used for researching selective identification property of the preparative molecular imprinting membrane. The result shows that, according to the invention, the obtained mythyl p-hydroxybenzoate molecular imprinting composite membrane has super mythyl p-hydroxybenzoate molecule identification performance.

The invention discloses a hydrotherapeutic face pack employing mineral salts as the principal raw materials, which is prepared from mineral salts 10-40%, sodium hyaluronate 0.01-1%, polyethylene glycol 1-5%, glycerol 1-10%, 1.3-butylene glycol 2-14%, citric acid 0.012%, sodium citrate 0.1-1%, methyl-p-hydroxybenzoate 0.1-3%, propyl-p-hydroxybenzoate 0.2-4%, perfume compound 0.1-5% and balancing deionized water.

The invention provides a synthesis method of long-chain methyl p-hydroxybenzoate, which comprises the following steps: 1) adding p-hydroxybenzoic acid, alcohol and a catalyst into an esterification reactor, adding a water-carrying agent, and heating under reflux for dehydration; 2) cooling the reaction solution, adding n-hexane while stirring, cooling to -20-25 DEG C, standing for 0.5-10 hours, filtering to obtain a filter cake and a filtrate, and drying the filter cake to obtain white powdery long-chain methyl p-hydroxybenzoate; and 3) carrying out vacuum evaporation to remove the n-hexane in the filtrate to obtain a surplus reaction solution, adding the p-hydroxybenzoic acid, alcohol and water-carrying agent into the surplus reaction solution, and repeating the steps above, wherein the alcohol is normal decyl alcohol, normal undecyl alcohol, normal lauryl alcohol or normal tridecyl alcohol, and the water-carrying agent is benzene, cyclohexane or n-hexane. The n-hexane is directly added to precipitate the long-chain methyl p-hydroxybenzoate from the reaction solution without evaporating out excessive alcohol. The method has the advantages of separable product, reusable catalyst, alcohol, n-hexane and water-carrying agent, and no environment pollution.

The invention belongs to the technical field of daily chemical products, and particularly relates to whitening and stain removing toothpaste and a preparation method thereof. The whitening and stain removing toothpaste comprises, by weight, 6-9 parts of propylene glycol, 8-10 parts of sorbitol, 18-24 parts of silicon dioxide, 26-30 parts of calcium pyrophosphate, 0.4-0.8 part of mint oil, 0.02-0.06 part of saccharin sodium salt, 0.1-0.3 part of propylparaben, 0.5-1.6 parts of cocamidopropyl betaine, 0.3-1.2 parts of xanthan gum, 0.03-0.08 part of xylitol, 0.05-0.12 part of methyl p-hydroxybenzoate, 0.2-0.5 part of tea tree essential oil, 3-5 parts of perlite, 0.8-1.6 parts of papaya enzyme, 1-2 parts of stannous pyrophosphate, 0.5-1 part of sodium alginate and 14-25 parts of deionized water. The whitening and stain removing toothpaste can effectively remove color spots and dental plaque, and teeth are whitened.

The invention discloses a compound preservative and an application thereof and aims to provide one compound preservative which is simple in preparation method and is good in antiseptic and antibacterial properties. The preservative disclosed by the invention is used as an additive of a skin care product. The technical key points are as follows: the preservative is composed of a solute and phenoxyethanol in a mass ratio of 1 to 1, wherein the solute is composed of the following components in mass percentage: 1%-40% of methyl p-hydroxybenzoate, 1%-40% of ethyl p-hydroxybenzoate, 1%-20% of propyl p-hydroxybenzoate and 1%-15% of butyl p-hydroxybenzoate; the sum of all the components is 100. The invention provides the application of the compound preservative as the additive of the skin care product, belonging to the technical field of household chemicals.

The invention provides a quick-acting hemostatic yarn for promoting wound healing and a preparation method and application thereof. The quick-acting hemostatic yarn is prepared from the following components by weight: 35-60 parts of sodium carboxymethyl cellulose, 30-50 parts of polyurethane elastomer, 5-20 parts of alpha-N-octyl cyanoacrylate, 10-30 parts of chitosan, 10-20 parts of methyl p-hydroxybenzoate, 15-25 parts of propyl p-hydroxybenzoate and 5-10 parts of xanthan gum. The chitosan is a mixture of lauroyl sulfuric acid deacetylated chitosan and carboxymethyl chitosan. The quick-acting hemostatic yarn has better hemostatic effect and bacteriostasis rate, can further provide a suitable moist recovery environment for wounds, and has no allergic reaction to skin.

The invention discloses a cleaning agent for automobiles and a preparation method thereof. The cleaning agent comprises 20-40 weight parts of lauroyl diethanolamide, 5-8 weight parts of triethanolamine oleate soap, 4-9 weight parts of triethanolamine, 10-20 weight parts of fatty alcohol-polyoxyethylene ether, 30-50 weight parts of methyl p-hydroxybenzoate, 20-40 weight parts of sodium dodecylbenzene sulfonate, 10-20 weight parts of isopropanol, 5-8 weight parts of sodium bisulfate, 3-5 weight parts of sodium nitrite, and 4000-6000 weight parts of water. Compared with the prior art, the cleaning agent disclosed herein has a good cleaning effect, can effectively remove dust, greasy dirt and impurities on automobiles, does not produce chemical corrosion on the aotumative surface, and has no toxicity and no harm.

The invention discloses an aloe mask. The invention consists of the following substances calculated by weight portions: aloe liquid: 2 to 4, silk fibroin peptide: 1 to 3, zinc oxide: 2 to 5, kaolin: 8 to 10, sodium alginate: 2 to 4, ethanol: 4 to 8, polyvinyl alcohol: 10 to 16, olive oil: 2 to 5, propylene glycol: 4 to 7, methyl p-hydroxybenzoate: 0.1 to 0.5, flavor: 0.1 to 0.5, distilled water: 55 to 65. The invention can lead the facial skin to be smooth, fine and rich in elasticity and has good effects of anti-wrinkle and sunscreen.

The invention discloses a plant hollow capsule which comprises the following ingredients by mass: 20 to 30 parts of hydroxypropyl methyl cellulose, 20 to 30 parts of carrageenan, 10 to 25 parts of alginate, 10 to 25 parts of guar gum, 6 to 12 parts of algal polysaccharides, 2 to 6 parts of carboxyl methyl glucomannan, 1 to 3 parts of a soybean isolate protein, 2 to 6 parts of a malt extract, 1 to 4 parts of starch, 40 to 60 parts of ethyl alcohol, 2 to 5 parts of triethyl ester, 1 to 4 parts of glycerin, 0.5 to 1.5 parts of titanium dioxide, 2 to 5 parts of magnesium stearate, 0.1 to 0.5 part of ethyl hydroxybenzoate, 2 to 5 parts of methyl p-hydroxybenzoate, 0.2 to 0.6 part of methyl silicone oil, 1 to 3 parts of an edible pigment, and 70 to 100 parts of purified water. The plant hollow capsule can reduce environmental pollution, prevents and treats the transmission of diseases, and improves the capsule security.

The invention discloses a moldproof polyethylene sheath material for cables and a preparation method thereof. The moldproof polyethylene sheath material for cables is prepared from the following raw materials in parts by weight: 80-90 parts of linear low density polyethylene, 15-20 parts of chlorosulfonated polyethylene, 10-15 parts of poly(4-methyl-1-pentene), 20-30 parts of carbon black N660, 4-8 parts of turpentine, 5-10 parts of dioctyl terephthalate, 1-2 parts of anilinomethyl triethoxy silane, 3-5 parts of methyl p-hydroxybenzoate, 8-12 parts of decabromodiphenyl oxide, 5-10 parts of zinc borate, 10-15 parts of aluminum hydroxide, 4-8 parts of brucite powder, 5-10 parts of tri(2-chloropropyl)phosphate, 2-4 parts of light magnesium oxide, 1-2 parts of tributyltin chloride, 2-3 parts of barium stearate, 3-6 parts of calcium hydroxide, 3-4 parts of oxidized polyethylene wax, 5-8 parts of quartz powder, 3-5 parts of nano silver and 4-6 parts of composite filler. On the premise that the excellent moldproof function of the sheath material is ensured, the sheath material can effectively inhibit Aspergillus niger, Aspergillus terreus and other molds from growth and reproduction, so that the cable is free from mold invasion, and the service life of the sheath is prolonged.

The invention discloses a measuring method of the residual quantity of preservatives. The measuring method of the residual quantity of the preservatives is used for simultaneously measuring five preservatives through using gas chromatography-mass spectrometry, the five preservatives comprise methyl p-hydroxybenzoate, ethyl p-hydroxybenzaote, beta-naphthol, 4-phenylphenol and diphenyl ether; and the measuring method of the residual quantity of the preservatives specifically comprises the following steps of: smashing a sample to be measured, performing ultrasonic extraction on the sample to be measured through an organic solvent, concentrating the sample to be measured through a parallel evaporator for the first time, purifying the sample to be measured through a solid phase extraction column, concentrating the purified sample to be measured for the second time, fixing the volume through methanol, filtering the treated sample, and performing gas chromatography-mass spectrometry analysis on the filtered sample. The method has the advantages of being convenient and quick for operation and good in repeatability, and the like, the adding standard recovery of the method is 80.5-104%, the relative standard deviation (RSD) is 1.21-6.41%, and the method is capable of meeting the monitoring demands of the residual quantities of the five preservatives in fresh fruits.

The invention discloses an eye cleaning liquid for cleaning eyes and a preparation method thereof. Every 1000ml of the eye cleaning liquid is prepared from the following components by weight: 0.2-2g of sodium hyaluronate, 3-9g of sodium chloride, 2-6g of boric acid, 0.2-1g of borax, 1-6g of a felwort extraction liquid, 1-6g of a concha haliotidis extraction liquid, 10-100mg of menthol, 5-50g of borneol, 5g of propylene glycol, 0.3g of methyl p-hydroxybenzoate, 0.15g of propyl p-hydroxybenzoate and purified water which is added to 1000ml. The pH value of the eye cleaning liquid is 6.5-7.5, and the osmotic pressure is 260-330mOsm / kg. The eye cleaning liquid taking Chinese herbal medicines as main raw materials is safe and reliable and has the advantages of being used for preventing and relieving eye fatigue, eye discomfort and eye dryness.

The invention relates to a decontaminating and brightening agent for leather, which comprises the following components in parts by mass: 10-25 parts of triglycerin oleate, 4-8 parts of stearoyl monoglycollic amide, 8-12 parts of N-alkylstearic amide, 8-15 parts of nitrocellulose, 18-24 parts of dibutyl phthalate, 0.5-0.15 part of mold preventive and 25-45 parts of solvent. The nitrogen content of the nitrocellulose is 10.5-12.5 wt%. The mold preventive is methyl p-hydroxybenzoate or ethyl p-hydroxybenzoate. The decontaminating and brightening agent for leather provided by the invention is especially suitable for sheepskin products, and has the advantages of mild formula and favorable seepage and decontamination effects; and by adding the triglycerin oleate as the greasing agent, the decontaminating and brightening agent for leather has the function of decontamination and enhances the water resistance and elasticity of the leather, thereby obviously improving the storage stability of the leather. By using the dibutyl phthalate as the brightening agent, the coated film is bright and fine, has the advantages of acid / alkali resistance, oil resistance and higher abrasion resistance, and is convenient to use.

The invention discloses a detection method for simultaneously determining various antibacterial agents in eye drops. Detection of eleven antibacterial agents (comprising chlorhexidine, benzyl alcohol, chlorobutanol, sorbic acid, benzoic acid, methyl p-hydroxybenzoate, ethyl p-hydroxybenzoate, propyl p-hydroxybenzoate, thimerosal, benzalkonium chloride and benzalkonium bromide) belonging to six types in the eye drops can be completed only through one-time experiment by adopting the method. The method adopting liquid chromatography has the advantages of good specialty, accurate qualitative and quantitative effects, high quantity of types and kinds of the simultaneously detected antibacterial agents, fast detection speed, suitableness for different brands of eye drops produced in different manufacturers, wide application range, and stable and reliable effect.

The invention discloses a water-soluble vitamin freeze-dried preparation for injection. 1000 bottles of freeze-dried preparations are prepared from the following raw materials: 2.8-3.4g of thiamine mononitrate, 36-44g of nicotinamide, 4.4-5.4g of pyridoxine hydrochloride, 14.8-18.1g of sodium pantothenate compound, 4.4-5.4g of riboflavin sodium phosphate, 102-124g of sodium ascorbate, 54-66mg of biotin, 0.36-0.44g of folic acid, 4.5-6.0mg of vitamin B12, 0.4-0.6g of methyl p-hydroxybenzoate, 280-320g of glycine, 0.4-0.6g of ethylene diamine tetraacetic acid disodium salt and 2000-3000ml of water for injection. The stability of existing sodium pantothenate is obviously improved by the obtained sodium pantothenate compound, thus ensuring that the sodium pantothenate containing water-soluble vitamin freeze-dried preparation for injection has ideal stability and curative effect and further ensuring medication safety of the patients.

The invention provides artificial aphids for aphidius gifuensis ashmead propagation. The nutritional compositions for preparing artificial aphids include the following components in percent concentration by mass: 30 percent of aphid homogenate, 20 percent of egg yolk, 20 percent of skim milk, 10 percent of sucrose, 1 percent of inorganic salt solution, 2 percent of complex vitamin solution, 10 percent of complex amino acid solution, 0.1 percent of methyl p-hydroxybenzoate, 0.2 percent of agar and 6.7 percent of distilled water. The artificial aphids can effectively supply nutrition essential to development of aphidius gifuensis ashmead, and an attractant for oviposition of aphidius gifuensis ashmead is applied to the surface of artificial aphids, so that the survival rate, parasitism rate and eclosion rate of aphidius gifuensis ashmead can meet actual requirement. The artificial aphids can be used for solving defects of complex process, large occupation space, high cost and the like of a traditional propagation method, and the propagated aphidius gifuensis ashmead can be easily collected, stored and released; and the artificial aphids have the advantages of wide raw material source, simple preparation process, and is suitable for large-scale popularization.

The invention relates to the technical field of skin care products, in particular to a facial mask containing human adipose-derived mesenchymal stem cell extract. The facial mask comprises facial maskpaper and facial mask liquid. The facial mask liquid is infiltrated on the facial mask paper. Every 100 parts of facial mask liquid comprise, by weight, 5-20 parts of oat peptides, 5-20 parts of wildsoybean peptides, 0.05-0.5 part of human adipose-derived mesenchymal stem cell extract, 10-20 parts of methyl p-hydroxybenzoate, 10-20 parts of polyoxyethylene (40) hydrogenated castor oil, 10-20 parts of phenylpropanol, 10-20 parts of 1, 3-butanediol, 10-20 parts of sodium hyaluronate and deionized water. The facial mask has the advantages that the facial mask is mild and non-irritant to skin, is weak in nutrient and functional factor adsorption capacity and can easily permeate into the skin, and accordingly skin nutrition can be timely supplemented; the skin can become fine and smooth in touch after the facial mask is used, and has uniform colors, and the quality of the skin can be obviously improved.

The invention discloses a spodoptera frugiperda larva artificial feed which is prepared from, by weight, 250-400 parts of wheat germ flour, 80-130 parts of soybean protein powder, 30-35 parts of yeastpowder, 25 parts of agar, 0.2 part of compound vitamin B, 8-15 parts of cholesterol, 2-3 parts of sorbic acid, 10-15 parts of ascorbic acid, 5 parts of methyl p-hydroxybenzoate, 4 parts of formaldehyde, 0.1-0.5 part of penicillin and 1500 parts of distilled water. The invention further discloses a preparation method and an application of the spodoptera frugiperda larva artificial feed. By the aidof the scheme, the artificial feed is long in storage time and complete in nutrient component, and the preparation method of the feed is simple. The artificial feed has high practical values and popularization values in the technical field of artificial breeding of insects.

The invention discloses a method for preparing p-hydroxybenzonitrile. The method comprises the following steps: adding filler and a catalyst into a fixed-bed reactor, dissolving feed, i.e., methyl p-hydroxybenzoate in an organic solvent, then, adding the solution into the fixed-bed reactor together with water, controlling the reaction temperature of the reactor to 300-480 DEG C and the reaction pressure of the reactor to 0-0.1KPa, carrying out continuous discharging, and carrying out rectification, thereby preparing p-hydroxybenzonitrile. The method is energy-saving and environment-friendly, continuous automated production can be achieved, reaction steps are simplified, process flows are reduced, and the problem in former p-hydroxybenzonitrile production that waste gases, waste water and waste residues are severe and the continuous automated production cannot be achieved is solved.

The invention relates to a Hamamelis toning lotion. Each part of the toning lotion comprises Hamamelis virginiana, ethanol, L-arginine, carbamide, zeta-aminoacetic acid, succinic acid, glycerin, methyl p-hydroxybenzoate and the balance of refined water. The prepared toning lotion is applied on skin. The witch hazel toning lotion has the effects of preventing chromatosis and preventing and treating color spots.