33results about How to "Reduce hydrolysis" patented technology

The invention relates to a recyclable TPEE film and a preparation method thereof. The recyclable TPEE film is prepared from the following raw materials in parts by weight: 100 parts of TPEE resin master batch, 0.5 to 2.0 parts of cross-linking agent, 1.5 to 2.5 parts of antioxidant, 0.5 to 1.0 part of tackifier and 15 to 18 parts of diatomite loaded nano titanium dioxide. The recyclable TPEE film provided by the invention has relatively high moisture permeability and tensile strength retention rate, and can be recycled.

The invention discloses a method for preparing vinyl sulfate by continuously oxidizing vinyl sulfite. In a fixed bed reactor, vinyl sulfite is used as a raw material and hydrogen peroxide is used as an oxidant. Under the condition of continuous introduction of carrier gas at 5-100°C, a high conversion rate of 98% of the raw material and a product selectivity of 88% are achieved. The catalyst is not deactivated after 300 hours of reaction and has good stability. The invention removes the reaction product in time and reduces product hydrolysis by continuously introducing carrier gas into the fixed bed reactor, thereby improving product selectivity. The fixed bed reactor is adopted to solve the problems of complex operation of intermittent reactors, difficult catalyst separation, discontinuous reaction, etc. The method for continuously preparing vinyl sulfate provided by the invention is simple, efficient, and has low energy consumption. The cheap titanium silicon molecular sieve reduces the reaction cost and is easy to industrialize, providing a new route for the efficient and green conversion of vinyl sulfite to prepare vinyl sulfate.

The invention relates to a sludge conditioning and dewatering composite agent and a preparation method thereof. The sludge conditioning and dewatering composite agent comprises a high-molecular polymer, wherein the high-molecular polymer comprises a 1-vinyl-2-pyrrolidone copolymerization unit and a copolymerization unit comprising an alkenyl group and an amino group or an acylamino group; and a tannic acid-inorganic salt complex. The sludge conditioning and dewatering composite agent can efficiently flocculate fine particles, increase the particle size of sludge, improve the sludge-water separation speed and promote deep dewatering of sludge.

The invention discloses an enzyme-labeled secondary antibody polymer for immunohistochemical staining. The enzyme-labeled secondary antibody polymer is formed by combining a secondary antibody and a polymer skeleton, the polymer is labeled by a labeling enzyme, the polymer skeleton is polymethylacrylic acid-2-hydroxyethyl ester, and the labeling enzyme is connected to the polymethylacrylic acid-2-hydroxyethyl ester through a coupling agent. According to the invention, polymethylacrylic acid-2-hydroxyethyl ester is used for modifying protein, so that the immunogenicity and antigenicity are reduced, the hydrolysis of protease can be weakened, and the solubility of protein molecules is improved. The enzyme-labeled secondary antibody polymer is applied to immunohistochemical staining and has high specificity and sensitivity.

This invention relates to the field of skincare technology, disclosing a composition containing acetylated curcumin, its preparation method, and its application. The composition comprises 0.01-0.50 wt% acetylated curcumin, 0.10-0.5 wt% ferulic acid, 0.05-0.40 wt% citric acid compounds, and 5.00-20.00 wt% polyol. Ferulic acid quenches reactive oxygen species and improves the stability of acetylated curcumin; citric acid compounds stabilize the pH of the system, chelate metal ions, block the Fenton reaction, and inhibit the generation of •OH free radicals; the polyol enhances the water solubility of acetylated curcumin and improves the stability of ferulic acid. This invention, through the compounding of ferulic acid, citric acid compounds, and polyol, significantly reduces the problems of discoloration, off-flavor, and pH decrease caused by the decomposition of acetylated curcumin aqueous solutions under high temperature or light conditions. Furthermore, the preparation process is simple, easy to operate, and highly adaptable to various processes.

A system and method for separating aluminum trichloride from cold-hydrogenated silicon tetrachloride includes a pressure-reducing tank, a condenser, a first extraction tank, a second extraction tank, a clear liquid filter, and a clear liquid tank. The system is characterized by: a silicon tetrachloride inlet pipe at the top of the pressure-reducing tank; the bottom of the pressure-reducing tank being connected to the first and second extraction tanks via pipes; the bottoms of the first and second extraction tanks being connected to a dryer via pipes; the side walls of the first and second extraction tanks being connected to the clear liquid filter via pipes; the tops of the first and second extraction tanks being connected to the condenser via pipes; the bottom of the condenser having a liquid outlet pipe connected to the top of the clear liquid tank; and the bottom of the clear liquid tank having a silicon tetrachloride recovery pipe; and the clear liquid filter being connected to the liquid outlet pipe via a pipe. This invention improves the clogging situation of the entire cold hydrogenation system, solves the problem of long-term operation of the cold hydrogenation system, and reduces the equipment failure rate.

This invention relates to a water purification agent with post-adjusted basicity, its preparation method, and its application, belonging to the field of water purification agent technology. The invention provides a method for preparing a water purification agent with post-adjusted basicity, the specific steps of which are: adding a regulator to a water purification agent to obtain a water purification agent with post-adjusted basicity; wherein the water purification agent is an iron salt solution, specifically FeCl3 solution, and the regulator is aluminum citrate solution; or the water purification agent is an aluminum salt solution, and the regulator is at least one of an organic acid and dilute hydrochloric acid. This invention, through the method of post-adjusting basicity, changes the basicity of the water purification agent system, thereby improving the utilization rate of the water purification agent. The prepared water purification agent with post-adjusted basicity ensures water quality treatment effect and stability, and reduces the dosage, thereby reducing the cost of the reagent. In high-alkalinity water bodies, the hydrolysis rate decreases by 50%, and the reagent utilization rate increases to 88%.

The invention relates to value-added urea for spring corn base fertilizer and a preparation method thereof. The preparation method comprises the following steps: sequentially and alternately adding the urea long-acting material and the urea conversion-promoting material into urea liquid at the same position according to the interval time of 6-10 minutes, so as to obtain the value-added urea for the spring corn base fertilizer. The invention aims to solve the problem that one-time production of the value-added urea for the spring corn base fertilizer on a urea production device is realized by sequentially and alternately adding a urea long-acting material and a urea conversion promoting material into a urea liquid, and secondary processing is not needed.

The invention discloses a rapid and efficient low-temperature dyeing process for wool / cashmere, which reduces the dyeing temperature to 85-90 DEG C by controlling the temperature in the dyeing process, thereby reducing the energy consumption, protecting the fiber structure and reducing the damage to the wool / cashmere. In the temperature range, the dye can better permeate into wool / cashmere fibers, and a good dyeing effect is achieved. Compared with the traditional high-temperature dyeing process, the low-temperature dyeing process disclosed by the invention has the advantage that the dyeing time is remarkably shortened. Due to the adoption of low-temperature dyeing and the combination of special dyeing auxiliaries, the process can obviously improve the color fastness, especially the washing fastness and the rubbing fastness, so that the quality and the durability of a final product are improved. According to the invention, dyeing can be completed without adding other auxiliary agents in the dyeing process. The dye is wide in application range, and is suitable for all dyes for dyeing wool and cashmere, such as acid dyes, reactive dyes, neutral dyes and mordant dyes.

The application belongs to the field of pharmaceutical preparations and discloses a soothing pharmaceutical preparation and a preparation method thereof. The preparation method comprises the following steps: firstly, preparing synthetic naphazoline hydrochloride by using compound 1 containing a cyano group, wherein a composite solvent composed of toluene and ethyl acetate is used for condensation reaction in the synthesis process, and dilute hydrochloric acid is used for salt formation; secondly, preparing synthetic pheniramine maleate by using compound 2 containing a halogen group and compound 3 containing a cyano group, wherein a weak base catalyst is used for condensation reaction in the synthesis process; finally, adding functional additives, naphazoline hydrochloride and pheniramine maleate into water, stirring and dissolving, and filling to obtain the soothing pharmaceutical preparation, wherein the pH of the soothing pharmaceutical preparation is 5.7-6.3. The soothing pharmaceutical preparation prepared by the above method can effectively avoid the adverse influence of impurities in naphazoline hydrochloride and pheniramine maleate on the soothing effect.

The invention relates to the technical field of food, in particular to egg skin toast bread and a preparation method thereof. The egg wrapper toast bread comprises egg wrappers and toast bread, and the egg wrappers wrap the outer surface of the toast bread to form the egg wrapper toast bread; the toast bread is prepared from the following raw materials in parts by mass, comprising the following preparation raw materials: 95-100 parts of high gluten flour, 15-20 parts of quinoa flour, 8-10 parts of oat flour, 10-12 parts of white granulated sugar, 2-2.5 parts of yeast, 8-10 parts of soybean dietary fibers, 3-5 parts of whole milk powder, 1-2 parts of isomaltulose, 8-9 parts of butter, 5-6 parts of eggs, 1.2-1.5 parts of table salt, 1.5-1.8 parts of mackerel active peptides, 2-2.5 parts of baking powder, 0.03-0.035 part of a preservative and 30-35 parts of purified water. The egg skin toast bread has high advantages in the aspects of taste, nutritional value, shelf life, health function and the like, can meet the requirements of modern consumers for high-quality, healthy and nutrition-balanced food, and improves the market competitiveness of bread products.

The invention discloses a method for detecting aceclodine in a biological sample and application of the aceclodine in pharmacokinetics. The detection method comprises the following steps: taking a biological sample, adding 0.1-10 times of an aqueous solution containing a stabilizer into the biological sample, and uniformly mixing to obtain a biological sample solution; quantitatively transferring the biological sample solution, sequentially adding the internal standard substance working solution and the organic solvent, uniformly mixing in a vortex manner, and centrifuging; quantitatively transferring the obtained supernatant, adding pure water, uniformly mixing by vortex, centrifuging, and taking the supernatant to obtain a biological sample test solution; preparing a series of vinegar clinidine standard test solutions for the standard curve; and performing test analysis on the biological sample test solution and a series of vinegar clinidine standard test solutions for the standard curve by liquid chromatography-tandem mass spectrometry (LC-MS / MS). According to the invention, the method for detecting the aceclodine in the biological sample is applied to the pharmacokinetic research of the aceclodine in the living body, so that the technical blank in the aspect of aceclodine detection at present is filled up.

The present invention discloses a method for preparing a UV absorber, and the method for preparing the UV absorber comprises the following steps: S1, using 2-hydroxy-4-methoxy-benzophenone as a raw material to prepare a wet fine product of 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid; S2, drying the wet fine product of 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid to obtain a UV absorber, wherein the drying process comprises first-stage drying and second-stage drying, wherein the first-stage drying comprises at least one of reduced pressure drying and microwave drying, and the second-stage drying comprises at least one of reduced pressure drying and microwave drying. The UV absorber prepared by the present invention can avoid the problems of poor thermal stability and easy hydrolysis of UV absorber BP-4 by drying process.

The invention relates to the technical field of food, in particular to a biological enzyme treatment method for improving the yield and quality of goat cheese, the biological enzyme treatment method takes fresh goat milk as raw milk, biological enzyme and phenolic acid are adopted for treatment, and the biological enzyme is laccase or tyrosinase. According to the biological enzyme treatment method disclosed by the invention, the sheep cheese is produced and processed by adopting combined treatment of specific types of biological enzymes and phenolic acids, the prepared cheese product has the characteristics of high yield and high milk solid matter recovery rate, the economic value is higher, the quality of the product is well maintained in the storage period, and the shelf life is obviously prolonged. The sheep cheese produced and processed by adopting the biological enzyme treatment method disclosed by the invention is flat and glossy in surface, fine and smooth in tissue state, harmonious in milk flavor, golden in surface after being baked, moderate in hardness and excellent in sensory quality.

The invention belongs to the technical field of organic fertilizers, and particularly relates to a compound fertilizer for promoting flower growth and a preparation method thereof. The compound fertilizer for promoting flower growth comprises the following components: an organic matter, a nitrogen fertilizer, a phosphate fertilizer, a synergist and an anti-caking agent, the overall caking rate is low, after the compound fertilizer is compounded with an organic fertilizer, fertilization is performed in the flower growth period, sufficient nitrogen supply promotes functional leaf extension and chlorophyll synthesis, the photosynthetic efficiency is improved, and a continuous assimilation substance source is provided for underground rhizomes and overground branches. The plant is more robust, and the commodity character is obviously improved.

The invention relates to the field of advanced petrochemical and chemical new materials, and particularly discloses a hydrolysis-resistant and high-temperature-resistant polyamide composite material and a preparation method thereof. The polyamide composite material comprises the following raw materials in parts by weight: 5-7 parts of PA6 with the viscosity of 2.8-3.2; 80 to 83 parts of PA66, wherein the viscosity of the PA66 is 2.8 to 3.2; 8-12 parts of a toughening agent; 2-4 parts of a compatilizer; 0.5 to 1.5 parts of a lubricant; 0.3 to 0.9 part of an antioxidant; the hydrolysis-resistant agent is prepared from a copper complex hydrolysis-resistant agent SH3360 and a steric hindrance aromatic carbodiimide hydrolysis-resistant stabilizer AW700, and the weight ratio of the copper complex hydrolysis-resistant agent SH3360 to the steric hindrance aromatic carbodiimide hydrolysis-resistant stabilizer AW700 is 1: 1. The preparation method comprises the following steps: preparing raw materials; performing mixing; and extruding and granulating. The polyamide composite material disclosed by the invention has relatively excellent high temperature resistance and hydrolysis resistance.

The application discloses a synthesis method of a thiophene pyrimidine derivative, and the method comprises the following steps: in the presence of aluminum chloride and a first solvent, a compound 2 is reacted with N-methyl indole to generate a compound 3; in the presence of a second solvent and methane sulfonic acid, the compound 3 is reacted with 4-fluoro-2-methoxy-5-nitroaniline to generate a compound 4; in the presence of a third solvent and a first base, the compound 4 is reacted with N,N,N'-trimethylethylenediamine to generate a compound 5; in the presence of a fourth solvent and anhydrous potassium carbonate, the compound 5 is reacted with sodium hydrosulfite; then in the presence of a fifth solvent and an acid, a compound 6 is generated; in a sixth solvent, the compound 6 is reacted with 3-chloropropionyl chloride to generate a compound 7; then the compound 7 is reacted with a third base to generate a compound 8; and in a seventh solvent, the compound 8 is reacted with methane sulfonic acid to generate a compound 1. The application further discloses application of the method in preparation of a medicine for treating diseases caused by abnormal cell proliferation caused by overexpression of EGFR and the like.

The invention discloses a production process for simultaneously producing different varieties of PBT resin, and relates to the technical field of polyester production, different varieties of PBT products are simultaneously produced by adopting a six-kettle process flow, a titanium chelating catalyst is added, and the device is stable in production process and strong in anti-interference capability. Meanwhile, the product diversity is increased, the two esterification kettles are connected in series, the temperature and pressure requirements of the esterification reaction are low, the reaction is milder, the hydrolysis of a titanium ester catalyst is reduced, and the stability of the esterification rate can be ensured by adjusting the temperature, pressure, liquid level and other process conditions of the other reaction kettle when the process fluctuation of a single reaction kettle occurs; customized services are better provided for downstream customers, and the problem that the rate of superior products is reduced due to frequent production change in the traditional PBT production process is solved.

The invention belongs to the technical field of food processing, discloses functional low-glycemic-index recombinant rice and a preparation method thereof, and particularly discloses recombinant rice which is prepared from functional ingredients, an emulsifier, rice flour and resistant starch. The recombinant rice is round and full in appearance, low in cooking loss rate, good in chewing taste quality and close to natural rice in texture property, in-vitro starch digestion tests prove that the recombinant rice can obviously delay starch hydrolysis and delay glucose release, the in-vitro glycemic index is as low as 45, and the recombinant rice is suitable for being eaten by people with hyperglycemia for a long time, can obviously reduce the glycemic index, and can be used as a health-care food for people with hyperglycemia. The cooking loss rate of the cooked recombinant rice is 1t; 5%.

The invention relates to the technical field of biodegradable polyester materials, in particular to a hydrolysis-resistant high-barrier-property biodegradable film and a preparation method thereof. The invention relates to a hydrolysis-resistant high-barrier biodegradable film, which is obtained by carrying out esterification reaction and polycondensation reaction on aromatic dibasic acid, aliphatic dibasic acid, aliphatic dihydric alcohol, 2-ethyl-2-butyl-propylene glycol and polymeric carbodiimide, and the molecular chain of the aromatic dibasic acid contains a thiophene ring. The hydrolysis-resistant high-barrier-property biodegradable film disclosed by the invention has excellent hydrolysis resistance and gas barrier property at the same time.

The invention discloses a preparation method of a coordination polymer containing CuII and research on the inhibition effect of the coordination polymer on soil urease and nitrifying bacteria, and relates to the technical field of fertilizer.The preparation method comprises the steps that 3-aminopyridine and fumaric acid serve as raw materials to synthesize N1, N4-bis (3-pyridyl)-2-butenamide, then CuCl2. 2H2O and the synthesized N1, N4-bis (3-pyridyl)-2-butenamide are used for preparing the coordination polymer containing CuII. The novel coordination polymer [Cu (3-bbpa) (5-HIPA). H2O] is synthesized from N, N, N, N ', N'-bis (3-pyridyl)-2-butenamide and 5-hydroxyisophthalic acid by a hydrothermal method, and the crystal structure of the novel coordination polymer [Cu (3-bbpa) (5-HIPA). H2O] is analyzed to research the influence of the novel coordination polymer as an inhibitor on soil urease and nitrifying bacteria. The difunctional inhibitor is studied to delay the conversion process of urea from urea nitrogen to ammonium nitrogen and ammonium nitrogen to nitrate nitrogen, overcomes the defect of single inhibition capability of a traditional inhibitor, is strong in inhibition capability, low in toxicity, low in cost and simple in synthesis method, can effectively improve the utilization rate and stability of the fertilizer urea, and has a wide application prospect. Nitrogen loss in agricultural activities is reduced, the fertilization cost is reduced, and the grain yield is increased.

The invention relates to the field of pharmaceutical chemicals, and in particular to a method for industrially producing ioversol. The method is carried out according to the following reaction equation. The technical scheme of the invention can effectively reduce the generation of impurities and is suitable for industrial production to obtain ioversol with high purity and high yield.

The application belongs to the technical field of high polymer materials, and particularly relates to a PET-based long-acting antistatic master batch as well as a preparation method and application thereof. The application adopts HBP-IM and HOOC-PEG-COOH as comonomers, and anchors the antistatic active chain segment to the PET main chain through in-situ polycondensation reaction, so as to avoid the resolution and diffusion loss of the antistatic agent in the subsequent use or washing process. The hyperbranched structure provides sufficient free volume for the imidazole salt ion group, and cooperates with the effective passivation of trimethyl phosphate on the catalyst activity and the end capping of the carbodiimide on the carboxyl group, so as to jointly inhibit the ester exchange side reaction that may be intensified in the polycondensation process. The reaction process is precisely controlled through a stepwise reduced-pressure polycondensation program, the functionalized PET copolymer melt obtained from the polymer kettle is directly pumped into a double-screw extruder for blending and granulation in a molten state without cooling and granulation, and the hydrolysis and thermal cracking probability of the PET molecular chain in the secondary heating process is greatly reduced.

The present invention belongs to the technical field of preparation of pharmaceutical preparations, and specifically relates to K-5a2 solid dispersions and preparation methods thereof and their applications in preparations. The K-5a2 solid dispersion of the present invention comprises the following raw materials: K-5a2, a carrier, 4.5 to 9 parts of a diluent, an antioxidant, and an organic solvent. The preparation comprises the following steps: dissolving K-5a2 and an antioxidant in an organic solvent, first adding a carrier, then adding a diluent, and drying twice to obtain a K-5a2 solid dispersion. The K-5a2 solid dispersion is applied in preparations, and the K-5a2 solid dispersion is prepared into one of K-5a2 tablets, K-5a2 capsules, and K-5a2 dry suspensions. The K-5a2 solid dispersion provided by the present invention is used to prepare tablets, capsules, and dry suspensions, has good water solubility, and has high bioavailability. The present invention also provides a method for preparing a K-5a2 solid dispersion.

The present application belongs to the technical field of polycarbonate recycling, and relates to a regenerated transparent polycarbonate material and a preparation method thereof. The material comprises the following components in parts by weight: 95.5-99.87 parts of waste polycarbonate chips, 0.1-0.5 parts of an antioxidant compound, 0.01-3.0 parts of a chain extender, and 0.01-0.5 parts of a lubricant. The preparation method comprises the following steps: (1) drying; (2) mixing; and (3) melt granulation. The regenerated transparent polycarbonate material obtained by the present application has excellent mechanical properties and color stability, and is more likely to replace the application of virgin polycarbonate materials, thereby achieving effective recycling and utilization of waste transparent polycarbonate products.

The invention discloses a preparation method of a CoCrFeNiCuPrx high-entropy alloy based on H3Pr, and relates to a CoCrFeNiCuPrx high-entropy alloy. The H3Pr powder and the high-entropy alloy are prepared through a direct hydrogenation method and a powder metallurgy method respectively, and Co, Cr, Fe, Ni and Cu elementary substance powder and intermediate hydride H3Pr powder are weighed according to the proportion; and after high-energy mechanical ball milling, the powder is pressed and molded into a small round ingot, and the small round ingot is sintered through a vacuum rapid hot pressing sintering process, so that all elements are fully diffused. According to the preparation method disclosed by the invention, the CoCrFeNiCuPrx high-entropy alloy is prepared on the basis of H3Pr; the problems that the strength and hardness of the CoCrFeNiCu high-entropy alloy are low and the strength and hardness of the CoCrFeNiCu high-entropy alloy are not obviously improved by elemental Pr are solved, the decomposition temperature of H3Pr during heating is lower than the melting point of metal Pr, released Pr atoms can enter surrounding high-entropy alloy matrix crystal lattices only through short-distance diffusion, segregation of matrix elements and the oxidation tendency of Pr are greatly relieved, and the strength and hardness of the CoCrFeNiCu high-entropy alloy is improved. And a microstructure with relatively uniform components is obtained.

The application discloses a preparation method and application of a Co-based spinel material for catalyzing low-temperature regeneration of a rich-amine solution, and the Co-based spinel material is prepared by the following steps: taking anhydrous oxalic acid solution as a coprecipitator, forming a precipitate from (CH3COO)2Co·4H2O and acetate dissolved in H2O and C2H5OH, and aging the precipitate under stirring for 12 hours to form a transition metal doped Co-based composite metal oxide; taking an ammonia solution to provide an alkaline environment to promote hydrolysis of tetrabutyl titanate and perform outer dynamic coating of a TiO2 core-shell structure; and taking a sulfuric acid solution to impregnate to anchor graft an acidification group and form a sulfuric acid acidification core-shell structure Co-based spinel. The prepared catalyst has excellent catalytic activity for low-temperature intensified regeneration of a rich-amine solution.

The invention discloses a preparation method and application of a degradable polyepoxy chain extender. The structural formula of the chain extender is as follows: the invention adopts solution polymerization to obtain a copolymer with controllable molecular weight and narrow molecular weight distribution, and the polymerization process reduces the hydrolysis of epoxy groups in glycidyl methacrylate, improves the reaction activity of the chain extender, and can achieve a good chain extension effect of the polymer material at a low addition amount; and the main chain of the chain extender contains an ester group, has good biodegradability in acidic, alkaline or microbial environments, and is applied to degradable plastics without affecting their degradation performance.

The invention discloses a method for detecting a protein extinction coefficient. The invention provides a protein concentration determination method, which comprises: (1) carrying out liquid exchange on a substance to be determined through a desalination column to obtain a desalination liquid; (2) hydrolyzing the desalted liquid obtained in the step (1) to obtain hydrolysate; (3) carrying out pre-column derivatization on the hydrolysate obtained in the step (2) to obtain a derivative solution; and (4) determining the protein concentration of the derivative solution in the step (3) through high performance liquid chromatography. According to the method disclosed by the invention, the influence of a preparation background solution on proteolysis and detection is reduced, the time for proteolysis is short, and the measured extinction coefficient is high in accuracy and high in efficiency.

The present invention relates to poly(pentafluorophenyl ester)-based polymers for manufacturing electrochemical sensors, wherein the polymers have high reactivity with amine functional groups, cause less hydrolysis, maintain good solubility in organic solvents for general purposes, and have less steric hindrance and toxicity or side effects compared to polymers having similar structures, and thus are useful in insertion-type devices, especially continuous glucose monitoring systems whose part is inserted into the human body.