300 results about "P-Hydroquinone" patented technology

The invention discloses a high-performance polyurethane elastomer and a preparation method thereof. The high-performance polyurethane elastomer comprises two parts, i.e., a prepolymer component (component A) and a chain extender (component B), wherein the component A comprises the following materials in parts by weight: 100 parts of macromolecular dihydric alcohol and 14-35 parts of PPDI; the component B comprises the following materials in parts by weight: 100 parts of chain extender and 0.1-0.5 part of catalyst; the weight ratio of the component A to the component B is 100: 6-15; the chain extender is micromolecular dihydric alcohol, three-functionality-degree alcohol amine, three-functionality-degree alcohol or combination thereof; the micromolecular dihydric alcohol is selected from resorcinol-bi(beta-ethoxyl) ether (HER) or composition of the resorcinol-bi (beta-ethoxyl) ether (HER) and p-hydroquinone-bi(beta-ethoxyl) ether (HQEE) in the weight ratio of 1:0-2. The obtained elastomer material has the advantages that the permanent deformation is small, the resilience is excellent, the heat resistance and the mechanical performance are good and the temperature for the use and the operation of the prepolymer is low.

The invention discloses a novel method for simultaneous detection of hydroquinone and pyrocatechol by using a nitrogen-doped graphene-modified electrode. The method comprises the following steps: 1) placing the nitrogen-doped graphene-modified electrode in a sodium phosphate buffer solution which has a concentration of 0.1 mol/L and a pH value of 7 and contains hydroquinone and pyrocatechol with a total concentration of 1* 10<-4> mol/L and carrying out cyclic voltammetric scanning of different scanning speeds with a platinum wire electrode used as a counter electrode and a saturated calomel electrode used as a reference electrode; 2) placing the nitrogen-doped graphene-modified electrode in a sodium phosphate buffer solution which has a concentration of 0.1 mol/L and a pH value of 7 and contains pyrocatechol with a concentration of 1* 10<-5> mol/L and hydroquinone with different concentrations and carrying out differential pulse voltammetric scanning with the platinum wire electrode used as the counter electrode and the saturated calomel electrode used as the reference electrode; and 3) placing the nitrogen-doped graphene-modified electrode in a sodium phosphate buffer solution which has a concentration of 0.1 mol/L and a pH value of 7 and contains hydroquinone with a concentration of 1* 10<-5> mol/L and pyrocatechol with different concentrations and carrying out differential pulse voltammetric scanning with the platinum wire electrode used as the counter electrode and the saturated calomel electrode used as the reference electrode.

The invention belongs to the field of electrochemical detection and discloses a modified electrode for detecting hydroquinone and catechol. The modified electrode comprises a substrate electrode as well as graphene treated by L-tryptophan and attached on the substrate electrode. The modified electrode disclosed by the invention can be used for respectively detecting the hydroquinone and the catechol in a quantitative manner without a mutual interference problem, wherein a detecting linear range of the catechol is 5*10<-6>mol/L-3*10<-4>mol/L, and detecting limit is 1.45*10<-7>mol/L; and the detecting linear range of the hydroquinone is 5*10<-6>mol/L-5*10<-4>mol/L, and the detecting limit is 1.69*10<-7>mol/L.

The invention discloses a genetically engineered bacterium for expressing sucrose phosphorylase and application thereof, and belongs to the fields of gene engineering and enzyme engineering. The genetically engineered bacterium has the advantages that a gene shown in SEQ ID NO.1 is subjected to heterologous expression in escherichia coli, recombinant escherichia coli is constructed, and is fermented to produce recombinant sucrose phosphorylase, and enzyme activity in fermented supernatant reaches 40U.mL<-1>; when the recombinant sucrose phosphorylase is used for catalyzing saccharose and hydroquinone to generate alpha-arbutin, a conversion rate can reach 91%; the industrial application potential is higher.

The invention discloses a modified electrode for detecting pyrocatechol and hydroquinone. The modified electrode comprises a substrate electrode and phthalic acid ethylene glycol diacrylate-carboxylate multiwalled carbon nanotube-graphene which is attached to the substrate electrode. The invention also discloses a method for preparing the modified electrode. The modified electrode can be used for detecting the pyrocatechol and hydroquinone. The linear range of pyrocatechol detection is 5.0*10<-7>-4.0*10 mol/L, and the detection limit is 1.8*10<-8>mol L-1; the linear range of hydroquinone detection is 5.0*10<-7>-4.0*10<-4> mol/L, and the detection limit is 2.0*10<-8> mol L-1. The modified electrode is simple in preparation method, the preparation conditions are easily controlled and realized, the linear detection range is wide, the detection limit is low, and the detection method is high in stability and high in sensitivity.

The invention discloses a blackening agent at room temperature and a preparation method for the blackening liquid at the room temperature, which are widely applied to the blackening processing for finished products or parts of various alloy steels, cast irons and the like. The blackening agent at the room temperature is prepared from the following components: 2-4g/L of copper sulfate, 5-8g/L of seleninic acid, 2-4g/L of monopotassium phosphate, 1.5-3g/L of hydroquinone, 3-5g/L of phosphoric acid and 0.08-0.3g/L of OP-10. The preparation method comprises the following steps: respectively dissolving the components except the phosphoric acid and the OP-10 with deionized water through heating and then mixing the components evenly, and finally adding the phosphoric acid and the OP-10 for evenly mixing. The blackening agent has the advantages of quick blackening, good film quality and low production cost.

The invention discloses a medical adhesive, comprising the following substances in parts by weight: 65-80 parts of alpha-N-butylcyanoacrylate, 5-8 parts of hydroxypropyl methacrylate, 3-5 parts of sulfur dioxide, 1-2 parts of hydroquinone, 0.5-2 parts of polyurethane, 0.5-1.5 parts of agar, 0.8-1.2 parts of fibrin glue, 2-3 parts of water soluble phenol-formaldehyde resin, and 20-25 parts of deionized water. The medical adhesive has the beneficial effects that the medical adhesive provided by the invention is low in thrill, and excellent in bonding persistence; compared with the traditional common adhesive, the persistence of the medical adhesive can be up to 1.5-3 times; and animal experiments show that the toxic and side effects are small.

The invention relates to a composition capable of whitening and brightening, a preparation method thereof and an application thereof in cosmetics and belongs to the technical field of the cosmetics. The composition capable of whitening and brightening comprises the following ingredients in percentage by weight: 25% to 30% of arbutin, 10% to 15% of vitamin C or derivative thereof, 15% to 20% of nicotinamide, 3% to 6% of serpin, 1% to 2% of ginsenoside and 30% to 35% of sunscreen agent. According to the composition provided by the invention, the arbutin, the vitamin C derivative and the nicotinamide generate a whitening effect, and meanwhile, the serpin is used for protecting protein components of skin cells, promoting the activation and regeneration of the cells and eliminating cytotoxicity resulting from hydroquinone generated after the arbutin is reduced, so that the actions of long-acting whitening and cell activating are achieved; the composition has the advantages of little skin irritation and long acting time when the composition is applied to the cosmetics such as facial masks, emulsions and cream.

The invention belongs to the technical field of metal surface treatment, and particularly relates to black phosphating liquid for phosphating the surface of alloy steel which does not need to be acid cleaned in preliminary treatment. The black phosphating liquid comprises components with the following weight percentage: 2 percent to 5 percent of acidic manganese phosphate, 2 percent to 4 percent of diammonium hydrogen phosphate, 1 percent to 3 percent of cobalt nitrate, 1 percent to 2 percent of guanidine nitrate, 0.5 percent to 1.5 percent of hydroquinone, 0.2 percent to 1 percent of hydroxylamine sulfate, 0.5 percent to 2 percent of phosphoric acid with the mass concentration being 80 percent to 90 percent, and the rest is pure water. Due to the use of the black phosphating liquid, the operation is simple, the stability is good, the film forming speed is high, a formed film is fine and uniform, the color is black, the film forming strength is high, the corrosion resistance is strong and the like, and the black phosphating liquid is applicable to the surface treatment of alloy steel parts of various models.

The invention provides a hydroquinone farnesyl group compound and application of a pharmaceutical salt thereof in serving as an alpha-glucosidase, protein-tyrosine-phosphatase 1B or HMG-CoA reductase inhibitor, or in preparing drug for treating and/or preventing type-II diabetes or hyperlipidemia, or in preparing drug or functional healthcare products having hypoglycemic and hypolipidemic functions, or in preparing drug or functional healthcare products having a function of treating or preventing non-alcoholic fatty liver disease, or in preparing drug or functional healthcare products having liver protection effect, or in preparing drug or functional healthcare products for preventing and/or treating cancer or inhibiting tumor cell proliferation, or in serving as an RXRalpha receptor binding inhibitor, or in preparing drug serving as the RXRalpha receptor binding inhibitor. The inhibitors, the drug, food or the healthcare products prepared through the hydroquinone farnesyl group compound and the pharmaceutical salt are free of toxic and side effect and remarkable in treatment effect.

Provided herein are compounds and methods of using the compounds for determining levels of, for example, para-hydroquinones in a sample.

The invention relates to the field of carbon quantum dot preparation, and particularly relates to a preparation method of silicon doping carbon quantum dots by adoption of a solvothermal method and applications thereof. The preparation method includes: adding hydroquinone into a stainless steel high-pressure reactor the liner of which is polytetrafluoroethylene; adding acetone according to a ratio that 5 mL of the acetone is added for per 0.97 g of the hydroquinone; adding dropwise silicon tetrachloride into the reactor, putting the sealed reactor in an air dry oven, heating at 150-220 DEG C for 1-5 h, cooling to room temperature, and concentrating and evaporating the liquid mixture in the reactor to dryness by adoption of a rotary evaporation manner to obtain the silicon doping carbon quantum dots. The preparation method is simple, efficient and mild, and is low in operation cost and simple in preparation process equipment. The prepared silicon doping carbon quantum dots can be applied in cell biological imaging.

The invention discloses a normal temperature three-in-one phosphorizing agent capable of cleaning and derusting synchronously and preparing process thereof, wherein the bonderite comprises phosphorus acid, methyl ketone, ethanol, hydroquinone, non-ionic active agent and water as raw material, which is prepared through the steps of agitating, emulsifying and restirring.

The invention discloses a hot melt adhesive for adhesive tapes, which is composed of 73-80 polyisobutene glue, 20-25 polyisobutene oil, 0.3-0.5 ultravioresistant agent, 0-0.2 hydroquinone and 1-2 ceresin wax according to weight ratio, heavy engine oil can be added according to needs or heavy engine oil can be utilized to substitute for hydroquinone and ceresin wax with weight ratio of 1 to 2. The process for preparing the hot melt adhesive is that firstly various materials except polyisobutene glue are mixed and heated to 120-140 DEG C, the mixture is kept in the state of melting, and homogenously mixed after being blended, and then the polyisobutene glue is added, the constant temperature is kept between 120 DEG C and 140 DEG C, then the blending enables the system to be homogenously mixed, consequently the cooling is accomplished. Adhesive tape for a mosquitocide light is formed by evenly coating the prepared hot melt adhesive on a carrier. The hot melt adhesive of the invention is perfect in flow resistance and adhesive property, high in light resistance and oxidation resistance and environment-friendly in materials, which is capable of effectively sticking winged insects in -10 to 70 DEG C. In addition, the adhesive tape is durable, a relatively long adhesive tape placed in an adhesive tape box can be multiply used by sections, and the cost of consumable materials can be reduced.

The invention discloses a high-barrier corrosion-resistant lithium battery packaging film, which comprises a nylon layer, an aluminum foil layer and a heat-seal layer, and further comprises an outer graphene layer, an inner graphene layer and a silicone rubber layer, wherein the nylon layer, the outer graphene layer, the aluminum foil layer, the inner graphene layer, the silicone rubber layer andthe heat-seal layer are sequentially distributed from outside to inside, the nylon layer is prepared from MXD6, glass fibers, LLDPE-g-MAH, nanometer silicon dioxide, a silane coupling agent and hydroquinone, and the heat-seal layer comprises polypropylene, glass fibers, nanometer calcium carbonate, talcum powder and barium sulfate. The high-barrier corrosion-resistant lithium battery packaging film has good corrosion resistance.

The invention relates to the technical field of electrochemical immunosense, in particular to preparation and application of a carcino-embryonic antigen electrochemical immunosensor based on an Au@Ag@Au core-shell nano-composite (Au@Ag@Au NPs) marker. Specifically, the surface of a glassy carbon electrode is modified by nitrogen-doped graphene (NG) to prepare an antibody capture substrate, Au@Ag@Au NPs tracks and marks a carcino-embryonic antigen second antibody, the second antibody marked by Au@Ag@Au NPs is captured on the surface of the sensor through sandwich immune response, and detection of a carcino-embryonic antigen is achieved by detecting electrochemical signals of hydrogen peroxide and hydroquinone in a PBS solution.

The invention relates to the technical field of antioxidant preparation methods, and particularly relates to a preparation process of tert-butylhydroquinone (TBHQ). The preparation process comprises the following steps of (1) simultaneously adding excessive dilute sulphuric acid, equimolar hydroquinone and tertiary butyl acetate to a reaction still, wherein the weight ratio of the dilute sulphuric acid to the tertiary butyl acetate is 1:(3 to 6); (2) stirring and heating to 85 to 95 DEG C, and reacting for 1 to 8 hours; (3) stopping stirring, cooling to 65 to 75 DEG C, and then performing centrifugal filtration, wherein filtrate of sulphuric acid is recycled, and obtained filter residues are washed with 1 to 3 times warm water, so as to obtain a crude product of the TBHQ. Compared with the prior art, the preparation process has the advantages that the hydroquinone and the tertiary butyl acetate are used as raw materials, and the dilute sulphuric acid is used as a catalyst and a reaction solvent, so as to promote a reaction; tertiary butyl is supplied by the tertiary butyl acetate, so that side reactions are reduced; the crude product contains 70% to 75% of TBHQ, the content of DTBHQ (Di-Tert-Butylhydroquinone) as a by-product is low, the yield can reach 65 to 70% after purification, the yield is greatly increased, and great economic benefits are obtained.

The invention relates to a cooling fluid and particularly relates to a cooling fluid for mechanical cutting. The cooling fluid for mechanical cutting is prepared from tap water, a rust inhibitor, sodium chloride, sodium bicarbonate, sodium benzoate, an anti-wear lubricating agent, butyl hydroquinone and an explosion-resistant agent. The cooling fluid is free of harmful substances such as nitrite and heavy metals, no deterioration and smelliness, no corrosion on machine tools and workpieces, no bubbles and no peculiar smell are caused after the working fluid is circularly used for six months, the cooling fluid is capable of facilitating cutting of a product, no rustiness is caused within 15 days, strong rust-proof capability is achieved; the cooling fluid is simple in formula and is convenient to operate and a synthetic product can be stored for more than two years.