37results about How to "Reduce production conditions" patented technology

The invention provides application of compounds(I) of 6 alpha-fluorine-9,11-epoxy-17,21-dihydroxyl-pregnan-1,4-diene-3,20-dione-17,21-diacetate in preparing fluocortolone and 21-bit esters(Z) thereof. By reduction of bromine hydroxides at the 17th and 21st bits, degreasing and grignard reaction at the 16th and 17th bits, modification of methyl at the 16th bit and hydrolysis of acetate and esterification at the 21st bit, the compounds(I) are converted into the fluocortolone and the 21-bit esters(Z) thereof.

The invention discloses a method for growing a spiral carbon nanotube on porous carbon derived from timber. The method is characterized in that the carbon nanotube is subjected to chemical vapor deposition on the carbonized wood, space constraint effect of a natural vertical tube of the carbonized wood and the shearing contraction effect of the mixed acid on the carbon nanotube are used, and the spiral carbon nanotube with a uniform morphology height is prepared at the carbonized wood. The spiral carbon nanotube can increase the conductivity of the carbonized wood, and obviously increases themechanical property of a composite material. The composite material can be used as a super capacitor electrode, the natural vertical tube can provide an enough space for introducing other nano-materials, and a composite electrode does not require addition of a binder and a conductive agent. The elastic interleaving network of the spiral carbon nanotube is in favor of transmission of electrolyte ions, and an application of the composite material in the field of energy storage can be widened. The method has the advantages of simple technology, short production period and easy control, and can realize macro-preparation of the spiral carbon nanotube.

The invention discloses a preparation method of a sodium polyacrylate aqueous solution with high solid content and narrow molecular weight distribution. The method comprises the following steps: solution preparation: deionized water and sodium hypophosphite are added into a reactor and continuously stirred for dissolving to prepare a solution of sodium hypophosphite, and the solution is heated to 60-110 DEG C at the same time; polymerization: acrylic acid monomer, an initiator and sodium hypophosphite are sequentially dripped into the solution prepared in the step of the solution preparation for 0.5-5h, constant-temperature reaction is carried out for 0.5-5h after the dripping to obtain a mixture, an alkali is added to neutralize the mixture to neutrality after the reaction is completed. The method uses sodium hypophosphite as the chain transfer agent to prepare the aqueous solution of sodium polyacrylate, wherein the solid content of the aqueous solution is greater than or equal to 45.0%, the weight molecular weight of the aqueous solution is 1000-10000, and the molecular weight distribution of the aqueous solution is 1.7-2.5. The aqueous solution of sodium polyacrylate has higher chelating ability, dispersion force and antiredeposition ability, and can partly or completely replace sodium tripolyphosphate to be used in washing products to reduce pollutions of detergents to the environment.

The invention discloses a method for the synthesis of alpha-arbutin. The method comprises: heating a substrate, boron trifluoride etherate and a certain amount of a reaction medium to 30-80 DEG C to react for more than 48h, neutralizing, washing, drying, and concentrating to obtain an alpha-type arbutin intermediate with a relatively high purity, and thus obtaining the alpha-arbutin after hydrolysis and recrystallization. The method of the invention can improve the proportion of alpha/beta-glucoside, or convert a beta-type arbutin intermediate into an alpha- type arbutin intermediate, alpha-type isomer in the obtained intermediate product is high in purity (>=92%), easy to purify, and the obtained alpha-arbutin product has a purity of more than 98%.

The invention relates to a method for processing a magnetic refrigeration material by taking rare earth metal Gd and a multicomponent alloy thereof as raw materials. The magnetic refrigeration material taking Gd as a main body mainly comprises a pure Gd piece, pure Gd particles, a rolled Gd piece, a Gd-based alloy and a Gd-based alloy rolled piece. The processing method comprises the following steps of: firstly, processing a Gd metal or Gd-based alloy ingot; secondly, carrying cold rolling and vacuum heat treatment; thirdly, treating the surface of the rolled piece; fourthly, precisely dividing the rolled piece; and fifthly, plating the surface of the rolled piece.

The invention provides a quick joint belonging to the technical field of pipeline connection and solving the problems of low qualification rate, incapable maintenance, short service life and high cost of the traditional quick joint. The quick joint is provided with a body with a connecting hole which is internally provided with a sealing ring capable of forming the seal with an inserted connecting pipe; and a clamping mechanism capable of clamping or releasing the inserted connecting pipe is arranged at a port of the connecting hole and can be fixed on the body by a fixed cap. The fixed cap is fixedly connected to the body by welding or adopting threads. The quick joint has the advantages of convenient processing, low condition required by the production, convenient and firm connection and convenient maintenance and replacement of the clamping mechanism or the sealing ring.

The invention provides a method for subcritical fluid extraction of tea extract. The method comprises the following steps of carrying out dimethyl ether subcritical fluid continuous dynamic extraction on tea at a temperature of 15-60 DEG C under pressure of 0.4-3MPa for 30-270min so that an extract mixture is obtained, removing tea residue from the extract mixture, and carrying out dimethyl ether subcritical fluid gasification at a temperature of 40-60 DEG C under the pressure of -0.08 to 1.2MPa so that the tea extract is obtained. The method needs a low temperature and low pressure in extraction, prevents biologically-active substances in tea from being destroyed, and has a low equipment cost. The tea residue has low water content and a high recycle value. The method can be widely used in the field of tea extract preparation.

The invention provides an internally-installed heat-retaining cast-in-place concrete composite shear wall. The internally-installed heat-retaining cast-in-place concrete composite shear wall comprisesa protective layer, a heat-retaining layer and a structure layer, wherein the protective layer, the heat-retaining layer and the structure layer are sequentially arranged between an outer die plate and an inner die plate; and an anti-crack mesh piece, a first connecting piece and a second connecting piece are arranged in the protective layer, the anti-crack mesh piece is arranged between the first connecting piece and the second connecting piece, a third connecting piece is arranged in the structure layer, one end of the second connecting piece is connected with the first connecting piece, and the other end of the second connecting piece penetrates through the heat-retaining layer and is connected with the third connecting piece. The invention further provides a construction method of theinternally-installed heat-retaining cast-in-place concrete composite shear wall. The internally-installed heat-retaining cast-in-place concrete composite shear wall and the construction method thereof have the advantages that compared with other integrated materials, the construction cost is low, the production technology is simple, the production condition is low, the production efficiency is high, and the labor cost is reduced.

The invention discloses a free forging oil press rack. The free forging oil press rack comprises an upper cross beam (1), a lower cross beam (2) and two upright columns (3), which are formed by a welding process, wherein the two upright columns (3) are vertically symmetrically arranged at two sides of the free forging oil press rack; the upper cross beam (1) is arranged at the top of the free forging oil press rack, is positioned between the two upright columns (3) and is pre-tightened and assembled together with the two upright columns by upper beam pull rods (4); multiple upper beam rectangular keys (5) are embedded in rectangular key slots reserved in the upper ends of the upper cross beam (1) and the upright columns (3); the lower cross beam (2) is arranged at the bottom of the free forging oil press rack, is positioned between the two upright columns (3) and is pre-tightened and assembled together with the two upright columns by lower beam pull rods (6); multiple lower beam rectangular keys (7) are embedded in rectangular key slots reserved at the lower ends of the lower cross beam (2) and the upright columns (3). The free forging oil press rack has the advantages of simple structure, light weight, low cost, short manufacturing period, easiness in manufacturing and machining and the like.

The invention belongs to the technical field of preparation of vanadium alloys, and concretely relates to a method for preparing a face-centered cubic vanadium nitride nano material and its product. The method takes ammonium vanadate, hydrazine hydrochloride and sodium as raw materials, the raw materials are heated in a high-temperature reaction apparatus to prepare the product, and the product is naturally cooled to room temperature to the crude product face-centered cubic vanadium nitride nano material. The ammonium vanadate is taken as the raw material, the cost of source of the raw materials is reduced; reaction temperature is obviously reduced, the technology process is simplified, energy is saved, continuous production is convenient, the face-centered cubic vanadium nitride nano material has no pollution on environment, the product purity is high, and the crystallinity is good.

The invention discloses a preparation method of alfalfa extract and belongs to the technical field of agricultural product processing. The method comprises the following steps: enzymolysis, centrifugation, precipitation, extraction and the like. The method disclosed by the invention is simple in operation, has relatively low requirements on production equipment, solves the problems of surplus yield of alfalfa and low resource utilization rate, and improves the utilization value and economic added value of the alfalfa.

The invention discloses a spring needle mounting and positioning structure for chip testing equipment, and the structure comprises a pedestal which is provided with an assembly hole and a positioning hole, and the assembly hole is communicated with the positioning hole; the spring needle is arranged in the assembly hole in a penetrating manner, a positioning part is arranged on the spring needle, the positioning part is located at the communication position of the assembly hole and the positioning hole, and positioning steps are arranged at the positions, at the two ends of the positioning part, of the spring needle; the positioning piece and the positioning hole are the same in shape and size, a clamping hole is formed in the positioning piece, the cross section of the clamping hole and the cross section of the positioning part are the same in shape and size, the positioning piece is inserted into the positioning hole, and the positioning part is arranged in the clamping hole in a penetrating mode. The two ends of the positioning piece abut against the positioning steps at the external positions of the two ends of the positioning part respectively. According to the invention, the assembling process problem and the size guarantee problem of the spring needle are well solved. The method is simple and reliable, and the problems of welding and positioning of complex equipment are solved. And the production conditions are reduced. And meanwhile, the consistency of finished products is improved, and application and popularization conditions are met.

The invention discloses a zero-VOC inorganic fire-resistant functional coating suitable for an electronic clean workshop and a preparation method thereof. The coating comprises the following components: 35-45 parts of a filler, 10-20 parts of calcium, 5-15 parts of tourmaline powder, 15-25 parts of inorganic mineral gel, 5-25 parts of inorganic mineral pigment, 1-5 parts of floating beads and 15-30 parts of clear water. The coating has the advantages of no harmful substances such as VOC, formaldehyde, benzene series and heavy metal, no radioactive hazards, good fire resistance, antibacterial performance, mildew resistance, no peculiar smell and no reduction in the yield of products in the electronic clean workshop.

The invention relates to an inorganic functional coating with a contact killing function on new coronavirus. The inorganic functional coating is prepared from the following components in parts by weight: 20 to 30 parts of filler, 15 to 25 parts of calcium, 7 to 19 parts of tourmaline powder, 5 to 15 parts of quaternization, 20 to 30 parts of inorganic mineral gel, 5 to 15 parts of inorganic mineral pigment and 20 to 30 parts of deionized water. The inorganic functional coating has good air permeability and breathing performance, cannot burn and emit toxic gas in a fire disaster, is excellent in virus contact killing performance, durable in color, durable, free of color fading, resistant to acid and alkali, durable, resistant to high temperature, and good in capability of effectively preventing ultraviolet radiation.