51results about How to "Avoid high temperature heating" patented technology

The present invention discloses guide blades of an axial flow fan shroud for guiding the air blown by an axial flow fan in an axial direction, and more particularly, to a guide blade structure capable of preventing the backflow of high temperature heat from an engine room toward a condenser. A guide blade 35 of an axial flow fan shroud 30 comprises: a leading edge 37 for introducing the air blown by an axial flow fan 10 including a number of blades 12; a trailing edge 39 extended from the leading edge 37 to downstream; and an air flow guide surface 38 for guiding the blown air between the leading and trailing edges 37 and 39, wherein if a first outlet area a is defined by at a radius r from a root in the total length R of an angle of projection Aout of the guide blade 35 and a second outlet area b is defined by the remainder, the angle of projection Aout increases as approaching a tip with respect to an axial line in the second outlet area b.

The invention discloses a novel green extraction technology for cordyceps polysaccharide, particularly discloses a method for extracting cordyceps polysaccharide through a two-membrane process. According to the method, the micro-filtration membrane and ultra-filtration membrane treatment and separation are performed on a cordyceps fermentation liquor under specific conditions to obtain the cordyceps polysaccharide. Through the adoption of the method, the traditional extraction mode of water extract and alcohol precipitate of cordyceps polysaccharide is changed, the purification effect of cordyceps polysaccharide is improved, the use level of ethyl alcohol during production is reduced, the economic benefit is increased, meanwhile, the amount of discharged filtrate waste water can be reduced, and the social benefit is obviously improved.

A method of forming a relief image on a substrate including: applying over a substrate a layer of an antireflective coating; and vacuum processing the antireflective coating. This method reduces the number of pinhole defects present in the antireflective coating.

The invention relates to a melting and stirring system in the building material industry, in particular to a lake asphalt melting and stirring system for treating naturally mined lake asphalt solidified into solid state. The lake asphalt melting and stirring system comprises a heat insulating stirring pot, and also comprises a melting device communicated with the pot body of the heat insulating stirring pot; the melting device comprises a melting bin with a first heating unit and a second heating unit installed on the outer wall; the second heating unit is provided with a gap part for the lake asphalt molten into liquid to flow into the heat insulating stirring pot; and the lake asphalt enters the heat insulating stirring pot after the completion of melting. Both the heat insulating stirring pot and the melting device can be used for continuous production, and intermittent shutdown is avoided, so that the yield is improved, and as only the melting device is subject to high-temperature heating, the temperature of the heat insulating stirring pot keeps low, not all the asphalt is subject to high-temperature heating, and energy consumption is reduced.

The invention discloses a method for extracting grifola frondosa fermentation broth polysaccharide by virtue of a dual-membrane process. According to the method for extracting the grifola frondosa fermentation broth polysaccharide by virtue of the dual-membrane process, the grifola frondosa fermentation broth polysaccharide is obtained by processing and separating grifola frondosa fermentation broth through a micro-filtration membrane and an ultra-filtration membrane under a specific condition. Due to adoption of the method, the traditional 'water-extraction and ethanol-precipitation' extraction mode of grifola frondosa fermentation broth polysaccharide is changed, the purification effect of grifola frondosa fermentation broth polysaccharide is improved, the amount of ethanol in the production is reduced and the economic efficiency is increased; and meanwhile, by adopting the method, the emission of filtrate wastewater can be reduced and social benefits are significantly increased.

The invention relates to a method for preparing sheet structured Cu nano-crystalline and belongs to the technical field of metal nano material synthetic methods. The liquid phase chemical reduction method is adopted and the preparation process comprises the following steps: taking copper sulfate as precursor to prepare copper sulfate solution so as to provide the copper source, adding sodium carbonate powder to increase the solution pH value, adding the complexing agent sodium citrate, adding the additive potassium bromide to adsorb in a directed manner so as to control growth of nano-crystalline, and adding ascorbic acid to stir at the room temperature. The method is simple to operate, realizes preparation of sheet structured Cu nano-crystalline under the room temperature condition and isbeneficial to low-cost preparation; and the adopted additive has water solubility, can be removed through the simple method and is beneficial to keeping the activity of Cu nano-crystalline.

The invention provides a preparation method of olefin and a method for synthesizing Chondriamide A and Chondriamide C. The preparation method of olefin comprises the steps as follows: a compound withthe structure shown in a formula (I), a palladium catalyst, a phosphorus ligand, alkali and an organic solvent are mixed and react at the normal temperature under light, and olefin with the structureshown in a formula (II) is obtained. Through selection of the specific phosphorus ligand, the method can realize efficient catalytic conversion at the room temperature under the action of photocatalysis, has mild reaction conditions, is simple to operate, meets the requirement for developing green and environment-friendly chemistry, and has more universal substrate selection range and functional group compatibility and excellent chemical selectivity. The method can be successfully applied to a scheme for introducing C-C double bonds in complex molecules and a synthesis strategy for optimizingpart of drug molecules, can improve the synthesis efficiency and reduce the cost and has industrial synthesis value and prospects.

The invention discloses honey colla corii asini walnut kernels and a making method thereof. The honey colla corii asini walnut kernels comprise, by weight, 80-120 parts of walnut kernels, 15-25 parts of honey, 15-25 parts of white sugar, 2-5 parts of vegetable oil and 3-8 parts of colla corii asini pulp. The making method of the honey colla corii asini walnut kernel comprises the steps that 1, the walnut kernels are boiled in water for 3-8 minutes, then frozen quickly at the temperature of 25 DEG C-30 DEG C below zero for 5-10 hours, and then baked at the temperature of 160 DEG C-190 DEG C for 3-8 minutes to obtain the cooked walnut kernels; 2, the honey and the colla corii asini pulp are mixed and heated at the low temperature of 15 DEG C-25 DEG C for 2-4 hours to obtain mixed pulp; 3, the walnut kernels prepared in advance, the mixed pulp, the white sugar and the vegetable oil are mixed, and kept for 10-10 minutes at the temperature of 50 DEG C-70 DEG C to obtain the honey colla corii asini walnut kernels made in advance; 4, the honey colla corii asini walnut kernels made in advance are frozen at the temperature of 25 DEG C-30 DEG C below zero for at least 10 hours to obtain the honey colla corii asini walnut kernels.

The invention relates to sulfur-modified emulsified asphalt and a preparation method thereof. The sulfur-modified emulsified asphalt is prepared from 40 to 50 parts by mass of asphalt, 5 to 20 parts by mass of sulfur, 2 to 10 parts by mass of styrene-butadiene latex, 0.3 to 1 part by mass of a nonionic emulsifier, 0.5 to 3 parts by mass of a cationic composite emulsifier, 0.03 to 2 parts by mass of a stabilizer, 0.5 to 3 parts by mass of an acid and 35 to 50 parts by mass of water. The sulfur-modified emulsified asphalt improves a softening point of the asphalt, improves the high temperature performances of the asphalt, has good low temperature performances, can improve the strength and stability of the asphalt pavement, and improves rutting and fatigue cracking resistance of the pavement. The sulfur-modified emulsified asphalt is prepared through simple processes, is free of heating, prevents generation of harmful gas, reduces the energy consumption and discharge, is beneficial to construction and the health of the construction personnel, and has great economic and social benefits.

The invention relates to a test method for detecting impermeability of mortar. The test method comprises the following steps: putting a cured mortar block to be tested into a standard laboratory for static drying for 0.5h, and uniformly coating the inner wall of an impermeability test mold with mixed sealant, wherein the thickness of the mixed sealant is 1 to 2mm; then, pressing the mortar block into the impermeability test mold with a press to form a mortar test block, extruding colloid from the upper and lower crevices of the mortar test block, and carrying out a coating operation again if crevices occur in the mortar test block; and keeping the bottom surface of the mortar test block into which the mortar block is pressed parallel to the bottom surface of the impermeability test mold, scraping the colloid extruded from the crevices above and below the mortar test block, and carrying out an impermeability test after 2 hours in the laboratory, wherein the mixed sealant is prepared bymixing acetic silicone sealant and fast hardening sulphoaluminate cement in a weight ratio of 2 to 1. Through adoption of the test method, the problem of easy leakage during detection of high pressureintensity is solved; the detection operation process is optimized; and the detection effect and accuracy are improved.

A process for the preparation of entacapone, in particular as the polymorphic form A, comprising the preparation of a compound of formula (V), as herein defined, by condensation of N,N-diethyl-cyano-acetamide with a compound of formula (IV), as herein defined, in the presence of a strong basic agent; the dealkylation of said compound of formula (V) to obtain entacapone and the crystallization thereof to the polymorphic form A.

The invention provides a preparation method of pear syrup special for relieving a cough for children. The preparation method comprises the following steps of cleaning pears, performing peeling, removing pear cores to obtain pear flesh, squeezing the pear flesh to obtain juice, and performing filtering to obtain filter residues and filtrate; and performing extracting on the peel and residues, separately performing vacuum concentration to obtain concentrated pear juice, adding carrageenin, and performing mixing so as to obtain the pear syrup. According to the preparation method disclosed by theinvention, parts high in arbutin content, in pears, are selected as raw materials, and a vacuum concentration method is adopted for preventing long-time high-temperature heating, so that preservationthe arbutin content is facilitated; and a reliable analysis and detection means is used as the auxiliary manner, so that the quality and the health-care effect of products can be guaranteed. In addition, the pear syrup special for relieving a cough for children, provided by the invention, well preserves the fragrance of pears, is moderate in sour and sweet degrees, is suitable for taste of children, and is free from any traditional Chinese medicine components and safe and non-toxic.

The invention discloses a preparation method of a KTN/PI composite film with high breakdown voltage and low dielectric loss. The preparation method comprises the following steps: firstly, modifying the surface of potassium tantalate niobate (KTN) by using a 3-(2-aminoethylamino)propylmethyldimethoxysilane coupling agent; and then preparing a PI-based composite film precursor through an in-situ polymerization method, carrying out heating at a temperature of 80-330 DEG C, and carrying out thermal imidization to prepare the KTN-NH2/PI composite film with a mass fraction of 3-11%. Compared with KTN/PI, the breakdown field strength of the KTN-NH2/PI composite film can reach 242.12 kilovolt/mm, which is 1.49 times of the breakdown field strength of the KTN/PI. When test frequency is 1.0 * 10<5> Hz, the loss tangent value of the KTN-NH2/PI composite film with a mass fraction of 3% is lower than 0.007.