37results about How to "Strong price advantage" patented technology

The invention relates to a scale remover for condensation equipment and a preparation method thereof. The scale remover is composed of 15% to 30% of a dissolving agent, 2% to 5% of a penetrating agent, 1% to 5% of a corrosion inhibitor, and a cosolvent 10% to 30%, purified water 20% to 30%, and the rest is ethanol, in terms of mass percentage; the dissolving agent is selected from oxalic acid, citrate, ascorbic acid, salicylic acid and glacial acetic acid, and the penetrant is selected from diethyl succinate Among esters, ethylene glycol monobutyl ether and dioctyl sulfosuccinate sodium salt, the corrosion inhibitor can be hexamethamine, aniline, diethylthiourea or rhodin, and the cosolvent can be p-benzoic acid, urea, Cyclohexanone, acetamide and sodium salicylate. The invention combines the above-mentioned raw materials and utilizes the combination effect to make them have strong descaling ability and fast descaling speed, less corrosion to equipment, low price, can save a lot of cleaning costs, and improve equipment operation level and energy utilization The level and production efficiency have greatly reduced the cost of producing products.

The invention discloses a method for synthesizing 4-hydroxymethyl-biphenyl, belonging to the field of organic synthesis. The method comprises the steps of enabling biphenyl, which is taken as a raw material, to react with NXS to generate 4-halogenated biphenyl; then, enabling the generated 4-halogenated biphenyl to react with magnesium metal in presence of chlorinated n-butane so as to generate aGrignard reagent; then, enabling the generated Grignard reagent to react with XCH2OR, and carrying out acidic hydrolysis to obtain the 4-hydroxymethyl-biphenyl. The method has the advantages of beingeasy in obtaining of raw material, low in cost and mild in conditions, thus having a process amplification prospect.

The invention belongs to the technical field of fine chemicals, and specifically relates to a method for preparing alkyd resin based on trimellitic anhydride rectification heavy raffinate, the reaction of trimellitic anhydride rectification heavy raffinate, monohydric alcohol and catalyst in a molten state, through a water separator Separate the water phase to obtain the monohydric alcohol esterification product of trimellitic anhydride rectification heavy raffinate. After the acid value meets the requirements, lower the temperature, add organic solvent and water, stir and mix evenly, then stand still, drain the water phase, and recover the reaction product through the rectification separation column. Solvent and monohydric alcohol, start the vacuum pump, distill out the reacted polyhydric alcohol in the reaction liquid, add organic solvent, stir and mix evenly to obtain the alkyd resin product. The preparation process of the present invention is simple and has high productivity, which is conducive to the batch preparation of high-performance alkyd resins. The polybasic acid in the heavy residual liquid of trimellitic anhydride rectification is used as a raw material to reduce the production cost of the product alkyd resin, improve economic benefits, and make the product have a strong price advantage.

The invention relates to a waterproof cement additive and cement containing the same. The waterproof cement additive is prepared through the following steps: dissolving polyvinyl alcohol in water, adding methyl acrylate in the solution, then adding an initiator, carrying out water bath at 60 to 90 DEG C, introducing nitrogen, and reacting for 2 to 10 hours, wherein the ratio of polyvinyl alcohol to methyl acrylate is 2g:(1 to 2) ml, and the weight ratio of polyvinyl alcohol to the initiator is (15 to 30):1. After the waterproof cement additive is blended with emulsion formed after cement is dissolved, cement has excellent continuous film forming performance, so that active groups in polymer molecules are possibly in the cross-linking reaction with Ca and Al in hydration products of cement to form a special bridge bonding effect, the physical organizational structure of hard cement mortar is improved, the internal stress is relieved, the generation of the microcracks is reduced, the compactness of waterproof polymer paint is enhanced, and the compactness is stronger.

The present invention discloses an ultrasonic power system based on high frequency transformer feedback, comprising an ultrasonic power, a matching inductor, an ultrasonic transducer, a non-inductive resistance, a high frequency pulse transformer, a phase discriminator and a DSP, wherein one output end of the ultrasonic power is connected with the matching inductor and the transducer in series in order and then is connected with one end of the non-inductive resistance and an end of a phase discrimination circuit resistance R1 respectively; the other end of the non-inductive resistance is connected with the other output end of the ultrasonic power; the output signal of the phase discrimination circuit is connected with the DSP; a primary terminal of the high frequency pulse transformer is connected with the output end of the ultrasonic power, one end of a secondary terminal of the high frequency pulse transformer is connected with one end of a phase discrimination circuit resistance R4 and the ground, and the other end of the secondary terminal of the high frequency pulse transformer is connected with the other end of the phase discrimination circuit resistance R4 and a 5th pin of an operation amplifier. The ultrasonic power system solves the problem of response delay in voltage phase measurement and reduces system error; and compared with a sensor, the high frequency transformer in the system has the advantages of small volume, light weight and low price.

A wettable powder of nimbin is prepared through including the raw nimbin with beta-CD (beta-dextrin) and adding wetting agent and dispersing in the inclusion compound. A microemulsion of nimbin is prepared from said wettable powder of nimbin and water as matrix through adding the surfactant with proper turbidity point and hydrophilic and lipophilic groups. Its advantages are high effect on improving the stability of nimbin, long effective period and low cost.

The invention relates to preparation methods of 4-formoxyl biphenyl, 4-hydroxymethyl biphenyl and 4-chloromethyl biphenyl, in particular to preparation methods which adopt biphenyl as substrate, anhydrous aluminum chloride and cuprous chloride as catalysts for preparing the 4-formoxyl biphenyl, and then use the 4-formoxyl biphenyl for preparing the 4-hydroxymethyl biphenyl and the 4-chloromethyl biphenyl. The methods have technical superiorities of high recovery ratio, simple reaction steps, easy-control conditions, applicability to industrialized production, low costs of raw materials, etc.