42results about How to "Reduce the risk of reactions" patented technology

The invention discloses liquid accelerator for sprayed concrete and application thereof. The liquid accelerator for sprayed concrete comprises, by weight percent, 30-50% of aluminum sulfate, 0.5-1.5% of triethanolamine, 10-30% of aluminate, 1.0-5.0% of cellulose, 5-10% of efficient water reducer, and the balance of water. In construction of the sprayed concrete, the accelerator 2-5% of cement is dosed. The accelerator is effective in setting acceleration, initial setting time is 2min-4min, final setting time is 4min-8min, early strength attains fast, 28d compressive strength ratio is over 95%, and the accelerator is high in cohesiveness and low in resilience. In addition, the accelerator is chloride-free and low in alkali and is capable of lowering the risk of concrete alkali-aggregate reaction and erosion of reinforced concrete.

The invention discloses a calcium silicate hydrate gel solution early strength agent and a preparation method thereof, and relates to the technical field of construction material production. The early strength agent and the method are used for solving problems of complicated preparation process, high cost, storage difficulty, and poor early strength effect of traditional calcium silicate hydrate powder. The calcium silicate hydrate gel solution early strength agent comprises a calcareous material, a siliceous material, a gel dispersant, and water. A weight ratio of the calcareous material to the siliceous material is 0.3-3:1. A weight ratio of water to the total of the calcareous material and the siliceous material is 5-30:1. The mass percentage of the gel dispersant is 0.1-2.0%. The preparation method of the early strength agent comprises the following steps: reaction materials are weighed; a sodium silicate water solution and a calcium nitrate water solution are respectively prepared; the two are mixed and are subjected to a reaction, such that a gel mixture solution is obtained; suction filtration is carried out; and water and the dispersant are added for re-dispersion. The early strength agent is uniform and stable, and is convenient to store. The early strength agent is highly convenient to use, and has a good early strength effect. With the early strength agent, an alkali-aggregate reaction risk can be effectively reduced.

The invention discloses a method for synthesizing polyaluminum sulfate, and discloses a preparation method for an alkali-free liquid quick-setting agent based on synthesizing polyaluminum sulfate. The alkali-free quick-setting agent is prepared by neutralizing aluminum sulfate solution in ammonia water to obtain active aluminum hydroxide gel, and the active aluminum hydroxide is filtered, dried, and ground into powder, and then added to aluminum sulfate solution to obtain polyaluminum sulfate . The proportion of this alkali-free quick-setting agent is: 45%-55% of polyaluminum sulfate, 0-5% of inorganic acid, 0-2% of stabilizer, 0-2% of organic early strength agent, 0-2% of organic tackifier %, the balance is water. In the case of a low dosage of the accelerator, the setting time of cement and the strength of mortar can meet the requirements of JC 477-2005 first-class accelerator for sprayed concrete, and the accelerator is an alkali-free liquid accelerator that can Effectively avoid the adverse effects caused by excessive alkali content. The cement variety of the accelerator has good adaptability.

The invention discloses a green high-early-strength low-alkali liquid accelerator. The components include: aluminum sulfate: (30-60%), sodium fluoride: (5-20%), alcohol Aluminum: (4‑10%), stabilizer: (3‑10%), suspending agent: (1‑5%), defoamer: (0‑1%), and the rest is water. A low-alkali liquid quick-setting agent for shotcrete of the present invention has the advantages of low alkali, no chlorine, no corrosion to human body and machines, no irritating smell, high early strength, high late strength retention rate, good durability, etc. , can greatly reduce the risk of concrete alkali-aggregate reaction and the erosion of reinforced concrete.

The invention discloses a vaccine for preventing tuberculosis, a combined medicine, a preparation method and an application, and belongs to the field of medicines for treating latent infection of tuberculosis. Aiming at the problems that the existing subunit vaccines are ineffective or poor in treating people with latent tuberculosis infection, many types of adjuvants are used, and there are risks of hypersensitivity reactions and Koch reactions, the present invention provides a prevention method containing a mycobacterial microbial compound adjuvant Tuberculosis vaccine, which comprises Ag85b protein, ESAT6-CFP10 protein and Mycobacterium vaccae cell extract. The tuberculosis prevention vaccine containing the mycobacterial microbial compound adjuvant of the present invention is used for treating latent tuberculosis infection, and the effect is remarkable.

The invention discloses a method for preparing high-purity L-menthone. In the method, under the action of a solid base-supported ruthenium catalyst, raw material L-isopulegol is subjected to a heterogeneous catalytic reaction to obtain high-purity L-menthone as a product. The present invention utilizes the ruthenium catalyst supported on the solid base to catalyze L-isopulegol with a high yield to prepare L-menthone under mild reaction conditions, the catalyst can be recovered in a convenient manner, and the reaction process is simpler. Low reaction cost, good environmental friendliness, no need to use hydrogen in the hydrogenation transfer process, and better process safety and industrialization prospects.

The invention discloses a method for synthesizing 4,4'-dihydroxybiphenyl by using a loop reactor, and the invention relates to the field of synthesis methods of 4,4'-dihydroxybiphenyl. The present invention aims to solve the problems of low yield, inefficient reaction and environmental pollution in the synthesis of 4,4'-dihydroxybiphenyl by the existing method. Method: Use cheap and easy-to-obtain phenol as raw material, add di-tert-butylene to isobutene under Lewis acid catalyzed conditions to generate di-tert-butylphenol, and then dissolve di-tert-butylphenol in an organic solvent under alkaline conditions, and oxidize the di-tert-butylphenol Combined into tetra-tert-butylbiphenyldiphenol, and finally add strong acid to the mixed solvent to catalyze the removal and recover isobutene, and obtain high-purity 4,4'-dihydroxybiphenyl through recrystallization or sublimation method. The invention has a total yield of more than 90%, and has the advantages of simple operation, high conversion rate, low cost, less waste, high product purity and the like. The invention is used for preparing 4,4'-dihydroxybiphenyl.

The invention discloses a method for synthesizing biphenyl dianhydride in a continuous-flow microchannel reactor: step 1 configures a reaction solution, mixes tetramethylbiphenyl, glacial acetic acid, a catalyst and an accelerator uniformly; step 2 preheats the reaction solution, Then enter the reaction module, and at the same time pass pure oxygen into the reaction module, and the reactants are mixed and reacted in the reaction module; after a certain period of time in step 3, the reaction product enters the receiving tank; in step 4, the acetic acid solvent is recovered, dehydrated, refined and recycled , the remaining product is washed and extracted to obtain biphenyl tetraic acid, and biphenyl dianhydride is obtained through melting and dehydration; step 5 biphenyl dianhydride is further purified to obtain 3,3'-BPDA, 3,4'-BPDA and 4, 4'‑BPDA.

The invention provides a continuous production method of a vulcanization accelerator DPG. The method comprises the following steps: (1) mixing diphenylthiourea, catalyst, ammonia water and an organic solvent to obtain a reaction raw material mixture; (2) reacting The raw material mixture and the oxidant are oxidized in a continuous flow reactor to obtain a reaction product; (3) post-processing the reaction product to obtain a vulcanization accelerator DPG; wherein the organic solvent in step (1) can dissolve diphenylsulfide Urea and vulcanization accelerator DPG. The method reduces the pressure in the reaction process, improves the utilization rate of raw materials, and while stabilizing the product quality, greatly shortens the reaction time compared with the traditional process, improves the reaction yield, and effectively overcomes the limitations of the traditional kettle-type batch production. shortcoming.

The invention relates to a preparation method of pyridone derivatives and an intermediate thereof. Specifically, the present invention relates to a preparation method for preparing pyridone derivatives represented by formula (II) and pharmaceutically acceptable salts thereof from compounds represented by formula (6), intermediates in the preparation process and preparation methods thereof.

The invention provides a gas-liquid phase vinyl chloride production process and device, belonging to the technical field of chemical product preparation, comprising the following steps: raw material treatment, the raw material includes a liquid catalyst and a mixed gas composed of hydrogen chloride and acetylene; acetylene hydrochlorination reaction, acetylene React with hydrogen chloride to generate vinyl chloride, and control the reaction temperature through a heat exchanger during the reaction; gas-liquid separation, the generated vinyl chloride gas flows out of the liquid catalyst, and the liquid catalyst cools and liquefies when the vinyl chloride gas passes through the condenser and flows back to The reaction zone acts on the reaction again; the liquid catalyst is recovered, and a small amount of liquid catalyst is separated again by means of a demister; the conversion rate of acetylene is detected. When the conversion rate is lower than 95%, the liquid catalyst is replaced. When the conversion rate is greater than 95%, it is used The original liquid catalyst continues to catalyze, aiming to solve the problems of overheating phenomenon, surface area carbon and low catalytic efficiency caused by gas-solid reaction in the existing process.

The application discloses a display substrate, a manufacturing method thereof, and a display device, which belong to the field of display technology. The display substrate includes a base substrate and a light emitting device layer, a thin film encapsulation layer, an optical adhesive layer and a polarizer disposed on the base substrate in sequence, and the polarizer is attached to the side of the thin film encapsulation layer away from the light emitting device layer through the optical adhesive layer. The optical adhesive layer is doped with ammonia absorber. The present application can reduce the risk of reaction between the ammonia gas overflowing from the thin film encapsulation layer and the polarizer, thereby reducing the risk of fading of the polarizer and improving the display effect of the display device. This application is used to reduce the risk of polarizer fading.