35 results about "Acid gel" patented technology

The invention discloses a clean viscous acid for acid fracturing of a carbonate reservoir, which is applied to the technical fields of acidification and acid fracturing of petroleum carbonate reservoirs. The clean viscous acid consists of the following components in percentage by weight: 3-7 percent of hexadecyl trimethyl ammonium bromide, 0.3-0.7 percent of sodium salicylate, 15-28 percent of hydrochloric acid, 0.125-0.25 percent of citric acid or 0.05-0.1 percent of CX-301 or 0.3-0.5 percent of TW-1 serving as an iron ion stabilizing agent, 0.2-0.25 percent of a diimidazoline quaternary ammonium salt and the balance of water. The clean viscous acid has high retardative property, the retarding rate can reach 42-56 percent, the fresh acid viscosity is 25-40 mPa.S, and the acid liquor viscosity rises during acid fracturing of the carbonate reservoir. When the hydrogen ion concentration falls till the pH is more than or equal to 2, the acid liquor viscosity rises for forming viscoelastic gel, the permeation resistance of an acid liquor in a high permeation layer is increased, and the length of an acid etching crack is prolonged. Reacted residual acid gel can undergo gel breaking automatically, is free from residues, is easy for discharging, and has small damage to stratums.

A hyaluronic acid gel is prepared from hyaluronic acid through pretreating for removing protein, and reacting on glicide ether at 15-35 deg.C for 2-24 hr. It features colorless transparent and long storage time.

The rinsing performance of acidic gel cleaners comprising acid, surfactant and water is improved using a synergistic combination of two polymers consisting essentially of (a) copolymer having a quaternized monomer and (b) microbially-derived polysaccharide. In a preferred embodiment of the invention, the acidic gel cleaner includes (a) a copolymer having at least a diallyldimethylammonium chloride monomer or an acrylamidopropyltrimethylammonium chloride monomer, and (b) xanthan gum. The improved gel cleaners have the unique ability to be easily rinsed from a hard surface even if previously dried into a dry mass on the hard surface.

The invention discloses a preparation method for low-molecular pectin, and aims to provide the preparation method for the low-molecular pectin which is simple in operation, single in molecular weightdistribution, and easy to industrial production. A technical key point of the method is as follows: (1) enabling the pectin to be dissolved in deionized water and forming solution; (2) performing micro-filtration membrane filtration on the pectin solution; (3) adding HCl solution to the pectin solution and forming acid gel, stirring in a rapid speed and breaking the gel, and stirring and washing,adding NaOH solution to dissolve the gel and forming concentrated solution; (4) performing acid hydrolysis on the purified pectin solution, after ending the hydrolysis, decompressing, suction-filtering and removing water, adding alkali solution to dissolve the gel and forming solution; (5) adding pectinase to the hydrolyzed pectin solution and degrading, after ending enzymolysis, decompressing, distilling and removing water from the pectin solution and forming concentrated solution; (6) adding absolute ethyl alcohol to the pectin solution and precipitating; and (7) drying a pectin precipitateunder an ordinary pressure.

It is intended to provide acidic gel foods containing soy protein to diversify means of taking soy protein in daily eating habits. Using the acid-soluble soy protein as specified in the description, an aqueous solution or an alcohol-containing aqueous solution of the protein is adjusted to pH 3 to 4.5. Then an acid having 2 or more acid groups per molecule or its salt or a salt of another acid or the like is added thereto and the mixture is heated to form a gel. Thus, acidic gel foods involving a jelly-like food favorable as a food can be obtained.

The invention discloses a method for removing endotoxin in pectin. A purpose of the invention is to provide an endotoxin removing method with characteristics of simple operation, high product yield and easy industrial production. The preparation method is characterized by comprising the following steps: (1) dissolving pectin in water to form a solution; (2) carrying out microfiltration separationon the pectin solution to remove solid impurities; (3) adding an acid solution into the pectin solution to adjust the pH value to form an acid gel, stirring to smash the gel, cleaning, carrying out reduced pressure suction filtration to remove moisture, adding an alkaline solution to adjust the pH value, and dissolving the gel to form a concentrated solution; (4) adding absolute ethyl alcohol intothe pectin solution, and precipitating; and (5) drying the pectin precipitate at normal pressure.

The invention discloses a composition for repairing the cervix and preventing bacterial vaginitis. The active ingredients of the composition include alpha-glucan oligosaccharide, inulin, silver ion water and lactic acid. A plurality of active ingredients in the composition have a synergistic effect and can achieve a good bacteriostatic effect; the composition is used for nursing and cleaning the female pudenda, correspondingly breeding of harmful pathogenic bacteria in the vagina can be reduced, and a healthy state is maintained. The composition is a weakly acidic gel, the pH value of the composition is close to the pH value of the interior of the vagina, the ecological balance of acids and alkalis in the vagina is maintained, and the composition has no stimulation to the vagina and is safe and free of side effects. In addition, the functional components in the composition can also improve the immunity of the organism and help patients resist the attack of bacterial viruses. It is proved by experiments that the prepared composition has an obvious inhibition effect on bacterial vaginosis.

The invention provides a normal-temperature low-acid gel type dairy dessert capable of preventing browning and a preparation method of the normal-temperature low-acid gel type milk-containing dessert.The normal-temperature low-acid gel type dairy dessert comprises the following raw materials in percentages by weight: 2-50% of dairy raw materials, 0-30% of cream, 5-15% of trehalose, 2-8% of sugaralcohol, 0.5-3% of starch and/or modified starch, 0.3-1.2% of a thickener, 0.05-0.3% of an emulsifier, 0.1-0.3% of an acidity regulator and the balance of water. The invention also provides a preparation method of the gel type dairy dessert. The gel type dessert provided by the invention can meet the requirement of commercial sterility, is not added with a preservative, has a normal-temperature quality guarantee period of 6 months, has no corruption problem, expands the sale channel, and is convenient for consumers to carry and eat. The product meets relevant standards of national standards ofjelly 19299-2015 and processed cheese 25192-2010.

The invention relates to an acid gel fracturing fluid and a preparation method thereof. At present, most of fracturing fluids used in the fracturing reformation of oil and gas fields are fracturing fluids in which guar gum and a derivative of the guar gum are taken as thickening agents and an organic substance or an inorganic substance of boron is taken as a crosslinking agent, the conventional fracturing fluid systems are usually alkaline, and alkaline substances and high-valence metal ions of stratums can form precipitates easily which can damage the stratums. The acid gel fracturing fluid consists of 94.9 to 96.9 weight parts of water, 0.6 to 0.9 weight part of thickening agent CJ2-9, 0.7 to 1.0 weight part of JL-9 crosslinking agent, 1.00 to 2.0 weight parts of surfactant and 0.80 to 1.2 weight parts of ammonium chloride. During fracturing construction, when a prepared solution A is pumped, the solution A and the JL-9 crosslinking agent are mixed in a volume ratio of (100:0.7)-(1000:1.0) to form the fracturing fluid. The acid water-based fracturing fluid in which modified guar gum is taken as a thickening agent has the advantages that: the content of gel breaking residue of the system is low, the amount of a liquid entering the ground is small, the flowback rate of the liquid is high, and the yield increasing retrofit effect is improved.

The present invention discloses a detection and analysis method for urine-modified nucleoside based on a surface-enhanced resonance Raman spectroscopy technology. In the method, a tumor marker modified nucleoside in the urine of a normal person and a cancer patient is extracted through the specificity of borophenylic acid gel; Au colloid is taken as an enhancing substrate to detect SERRS signals; and statistical analysis is conducted by using PLS-DA algorithms to establish a diagnosis and identification model for the SERRS of the urine-modified nucleoside. The model is used to discriminate that the to-be-detected urine-modified nucleoside belongs to the normal person or the cancer patient. After PLS-DA, the surface-enhanced resonance Raman spectroscopy data of the urine-modified nucleoside of the present invention has specificity of 96.9%, sensitivity of 98.2% and accuracy of 97.6%. The present invention has the characteristic of rapid and objective detection, and can provide important reference for doctors to diagnose esophagus cancer.

The invention discloses a method for improving the strength of a polyamic acid film edge part. The method comprises the following steps that slobbering film preparation is carried out on a defoaming polyamide acid resin solution, wherein the step is characterized in that a coating liquid coats a specific area of a support body, and the defoaming polyamide acid resin solution slobbers to the support body to form a film; and the coating liquid comprises, by weight, 70-90 parts of aprotic polar solvent, 10-30 parts of DMP-30, 0.1-1 part of triprimary amine crosslinking agent and 0.5-2 parts of triphenyl phosphite. According to the method, the coating liquid coats the specific area through the coating liquid with a specific proportion, so that the imidization degree of the edge part of the obtained polyamide acid gel film is effectively improved, the mechanical property of the edge part is enhanced, and thus the number of times of edge breaking and film breaking caused by abnormal edge parts in the process of longitudinal stretching, transverse stretching, imidization and the like is effectively reduced, and the yield is improved.

An emulsifier-free composition includes in a water phase a hydroxy acid system that includes alpha hydroxy, a blend of low pH, high electrolyte compatible thickeners and in an oily phase one or a combination of emollient oils. The composition has a pH in the range from about 1 to about 5.0 and is essentially free of emulsifiers and comprises a gel cream architecture.