92results about How to "Increase crystal density" patented technology

Methods of fabricating a polymeric implantable device, such as a stent, with improved fracture toughness through annealing a polymer construct below the glass transition temperature of the polymer of the construct prior to a deformation step are disclosed herein. The deformation of the construct induces crystallization in the polymer construct through strain-induced crystallization. The annealing of the polymer construct accelerates the crystallization induced during the deformation and results in an increase in crystallite density with smaller crystallites as compared to deformation of a tube that has not been annealed. A stent scaffolding is then made from the deformed tube.

The invention discloses a preparation method of a hexanitrohexaazaisowurtzitane/p-benzoquinone cocrystal explosive. Firstly a saturated solution of hexanitrohexaazaisowurtzitane and a saturated solution of p-benzoquinone are prepared using a crystallization solvent, and then the solvent is allowed to evaporate through a constant-temperature incubator, followed by crystallization to prepare a hexanitrohexaazaisowurtzitane/p-benzoquinone cocrystal explosive. The invention has the benefits as follows: the crystal density of the hexanitrohexaazaisowurtzitane/p-benzoquinone cocrystal explosive is up to 1.737 g/cm3, the melting point of the cocrystal explosive is 132 DEG C and is greatly increased by 17 DEG C as compared with relatively-pure component PBQ, and the cocrystal decomposition temperature is lower than that of both CL-20 and BQ and 207 DEG C lower than that of PBQ. Therefore, by virtue of cocrystallization, the thermal decomposition behavior of the explosive can be obviously controlled, the high efficiency and desensitivity of cocrystallization of the explosive are achieved, the safety of the explosive is improved, and the explosive has a good application prospect in high-energy low-sensitivity ammunition.

The invention discloses a foamed polypropylene bead containing a beta crystal, belonging to the field of foamed materials. The foamed polypropylene bead containing the beta crystal comprises, by weight, 100 parts of polypropylene resin, 0.2 to 5 parts of beta nucleating agent master batch, 0.5 to 2 parts of an antistatic agent and 1 to 10 parts of a foaming nucleating agent. The invention also discloses a preparation method for the foamed polypropylene bead. According to the invention, a high-pressure fluid is used as a foaming agent; autoclave foaming technology is employed; double or multiple melting peaks including alpha and beta are formed through introduction of the beta crystal into a polypropylene particle, the foamed polypropylene bead and a foamed polypropylene bead preform material; the foamed polypropylene bead with a low foaming temperature and a high expansion ratio is prepared in virtue of the characteristics of low melting point/low crystallization temperature, small crystal size and high crystal density of the beta crystal; and the foamed polypropylene bead preform material containing the beta crystal has high tensile strength, increased by 15 to 50% compared with samples of a same kind under the condition of same density.

The present invention discloses a preparation method for a hexanitrohexaazaisowurtzitane and m-dinitrobenzene co-crystallized explosive, wherein a crystallization solvent is adopted to prepare a hexanitrohexaazaisowurtzitane and m-dinitrobenzene saturated solution, and a constant temperature incubator is adopted to perform solvent evaporation and crystallization to obtain the hexanitrohexaazaisowurtzitane and m-dinitrobenzene co-crystallized explosive. According to the present invention, crystal density of the hexanitrohexaazaisowurtzitane and m-dinitrobenzene (CL-20-DNB) co-crystallized explosive is significantly increased by 19.6% compared with crystal density of DNB, detonation velocity and detonation pressure of the CL-20-DNB co-crystallized explosive are respectively increased by 46.2% and 147.5% compared to detonation velocity and detonation pressure of DNB, and the CL-20-DNB co-crystallized explosive has characteristics of a good detonation performance and high safety performance, and can be used for preparing low sensitivity ammunition.

The invention relates to a wear-resistant carbon fiber reinforced nylon 66 resin composition and a preparation method thereof, which mainly solves the problem of low impact strength of the existing wear-resistant carbon fiber reinforced nylon 66 resin composition and the problem that the tensile strength can be lowered after adding an impact modifier. The wear-resistant carbon fiber reinforced nylon 66 resin composition comprises the following components in parts by weight: A 45-70 parts of nylon 66 resin, B 1-20 parts of nylon 6 resin, C 5-25 parts of polytetrafluoroethylene resin, D 10-40 parts of carbon fiber and E 0.01-5 parts of at least one assistant from an antioxidant and a compatilizer. The technical scheme provided by the invention well solves the problem, and can be used for industrial production of injection molding processing of gears, bearings, pulleys, mechanical pump rotors and other mechanical parts.

The invention provides a polypropylene composition, a polypropylene flat filament prepared from the polypropylene composition, a preparation method of the polypropylene flat filament, and the polypropylene flat filament prepared by the method. The polypropylene composition comprises polypropylene and a nucleating agent; the molecular weight distribution index of the polypropylene is 2.5-5.5, and polymer tail index PIHT in molecular weight distribution width is greater than 1.9. The mechanical strength of the polypropylene flat filament is high.

According to the invention, a conventional nucleating agent suitable for regulating and controlling the crystallization behavior of polypropylene is applied to control the crystallization behavior ofpolyethylene, and the invention discloses a method for controlling assembling and preparing microporous expandable polyethylene beads by using different crystallization behaviors. 20-95 parts of linear low-density polyethylene adopted as matrix resin; 10-45 parts of high-density polyethylene or atactic polypropylene (the melting point is 130-150 DEG C); 0.05-5 parts of alpha-crystal nucleating agents comprising an inorganic nucleating agent with an alpha-crystal nucleating function, aromatic carboxylate, sorbitol and the like; and 1-15 parts of an auxiliary agent are utilized in the method. Extruding and granulating steps are performed by adopting a double-screw extruder. During production, an intermittent method is adopted; different crystallization nucleating agents are used for coordinating layer-by-layer assembling crystallization, rigidity increasing changes generated by the polypropylene alpha crystallization nucleating agents are flexibly combined with the crystallization speed,the size of crystal particles and the growth and solidification process of foam holes of a foam material, and the microporous expandable polyethylene beads good in performance and resistant to retraction are prepared.

The invention discloses a preparation method of a 2,4,6-triamino-5-nitropyrimidine-1,3-dioxide and nitric acid self-assembled energetic crystal material, comprising the following steps: (1) preparinga saturated aqueous solution of 2,4,6-triamino-5-nitropyrimidine-1,3-dioxide; (2) putting the saturated aqueous solution of 2,4,6-triamino-5-nitropyrimidine-1,3-dioxide in a beaker, then standing in aconstant temperature incubator, evaporating a solvent, and carrying out formation of crystal nuclei, crystal growth, crystal formation, filtration and drying in sequence to obtain 2,4,6-triamino-5-nitropyrimidine-1,3-dioxide and nitric acid self-assembled energetic crystal. The invention innovatively provides a 2,4,6-triamino-5-nitropyrimidine-1,3-dioxide and nitric acid self-assembled energeticcrystal material.

The invention relates to the technical field of smelting and chemical engineering. A green silicon carbide reaction mixture is manufactured by blending of the following materials in parts by weight: adding 0.2-0.6 parts of quartz sand, 0.18-0.55 parts of refinery coke, 0.1-0.3 parts of silicon carbide foundry return, and 0.3-0.7 parts of fine crystallization in 1 parts of roasting material and blending. A charging baffle plate of green silicon carbide reaction mixture comprises a baffle plate body, wherein no separating plate is arranged in the baffle plate body. The synthesis technology of green silicon carbide of reaction mixture combines two divided spaces of a decomposition zone and a reaction zone to a side reaction zone; the charging baffle plate is placed in the side reaction zone during material filling process; the side reaction zone is filled with reaction mixture. The green silicon carbide reaction mixture can effectively improve the heat conduction and radiation speed in the furnace, lowers the unit consumption index, reduces the working hour, greatly improves the manufacturing cost of silicon carbide, and then improves the product quality; the charging baffle plate has simple structure and is economical and practical.

The invention discloses a switch cabinet condensation prevention intelligent detection and control system comprising a cabinet body. The outer surface of the cabinet body is provided with a heat preservation layer. The inner wall of the cabinet body is provided with a condensation generation mechanism. The inner wall of the cabinet body is provided with a first temperature sensor. The cabinet bodyis internally provided with a dew point instrument which is used for detecting the inner air dew point temperature. The outer surface of the electrical equipment in the cabinet body is provided witha second temperature sensor. The cabinet body is internally provided with a drying mechanism which is used for drying the electrical equipment. The cabinet body is internally provided with a PLC. Thecold iron bars of which the temperature is lower than that of the surface of the electrical equipment in the switch cabinet can be provided and the condensation phenomenon is enabled to occur on the surface of the cold iron bars by priority and the condensed drops of water drops into the container filled with the desiccant along the cold iron bars so that the probability of condensation on the electrical equipment in the switch cabinet can be greatly reduced; besides, the electrical equipment can be dried by using the drying mechanism in the cabinet body so as to further avoid the condensationphenomenon on the electrical equipment.

The invention discloses an antibacterial medical isolation gown which comprises at least one outer non-woven fabric layer, a melt-blown nano-filtration layer and at least one inner non-woven fabric layer which are sequentially arranged from outside to inside, and the outer non-woven fabric layer and the inner non-woven fabric layer comprise the following raw materials in parts by weight: 90-100 parts of polypropylene (PP), 10-20 parts of metallocene polypropylene (LMPP), 10 to 20 parts of maleic anhydride grafted LMPP, 5 to 10 parts of polylysine, 1 to 3 parts of antibacterial agent, 1 to 5 parts of softening agent, 0.1 to 2 parts of antioxidant, 0.1 to 2 parts of nucleating agent and 0.1 to 1 part of lubricating agent. The invention further discloses a manufacturing method of the antibacterial medical isolation gown. The antibacterial medical isolation gown has the advantages of being light, soft, comfortable to wear and lasting in antibacterial effect. According to the manufacturing method of the antibacterial medical isolation gown, the raw materials are sequentially added into a mixer to be mixed according to the sequence, and the situation that due to the fact that all the raw materials are added at a time according to the weight parts, the raw materials are not fully mixed and melted, and the product quality is reduced is reduced.

The invention relates to the technical field of a high polymer material and specifically relates to a modified PPA composite material, a preparation method and an application thereof. The modified PPA composite material comprises PPA resin, reinforced modifier, antioxidant, lubricant, nucleating agent, high-fluidity modifier and high-concentration black master batch. The modified PPA composite material has the advantages of high fluidity, high strength and low thermal expansion factor. The preparation method comprises the steps of pretreatment, mixing and fusing pelletizing and has the advantages of simple process and low production cost. Besides, the modified PPA composite material can be applied to the preparation of an LED bead bracket and can promote the miniaturization development of the LED bead.

The invention discloses an additive for a 4-micrometre carrier-free electrolytic copper foil. The additive comprises the following raw material components by weight: 10-15mg/L ethylene thiourea; 70-80mg/L hydroxyethyl cellulose; 45-55mg/L polyethylene glycol; 90-110mg/L propyl ethyldithiocarbonate potassium sulfonate; and 160-190mg/L N.N-dimethylthio argonmethylacyl propanesulfonate sodium. The invention also discloses a preparation method and application of the additive. The additive for a 4-micrometre carrier-free electrolytic copper foil can reduce the rough surface roughness of the electrolytic copper foil, increase the crystallization density of crystal grains, and increase the tensile strength and peel strength. Through reasonable adding of the additive, the prepared copper foil can have a weight per unit area of 34-38g/mm<2>, a room temperature tensile strength of greater than or equal to 30Kg/mm<2>, a room temperature elongation of greater than or equal to 3%, a high temperature tensile strength of greater than or equal to 20Kg/mm<2>, a high temperature elongation of greater than or equal to 4%, surface roughness Ra of smaller than or equal to 0.3 micrometre and Rz of 0.6-1.0 micrometre.

The invention discloses a method for preparing special 3-nitro-1,2,4-triazole-5-ketone. The method comprises the following steps: providing a 3-nitro-1,2,4-triazole-5-ketone solution; and cooling the 3-nitro-1,2,4-triazole-5-ketone solution with a cooling medium and crystallizing to obtain the special 3-nitro-1,2,4-triazole-5-ketone. According to the provided method, a recrystallization technology is employed for increasing crystal density of a single-compound explosive, reducing internal defect of the crystal, and eliminating surface defects, so that the surface is smooth and dense, crystal shape and granularity can be controlled, quality of the single-compound explosive is enhanced, and moulding performance can be satisfied.

The invention relates to the technical field of polymer materials, and concretely relates to a highly-flame-retardant transparent PET material and a preparation method thereof. The transparent PET material comprises, by weight, 70-118 parts of PET resin, 8-16 parts of a nucleating agent, 3-7 parts of a compatibilizer, 7-13 parts of a flame retardant, 1-3 parts of a synergist, 0.5-1.0 part of talcum powder and 2-6 parts of a coupling agent, and the nucleating agent is a mixture comprising aluminum 2,2'-methylene bis(4,6-tert-butylphenol)phosphate (NA-21), dibenzylidene sorbitol and di(p-chloro-substituted benzylidene)sorbitol according to a weight ratio of (2.5-3.5):(1.2-1.8):(0.8-1.2). The transparent PET material is transparent and visible, and has the advantages of good transparency, good flame retardancy, good heat resistance, good smoke inhibition property, good stability, good oxidation and aging resistance, high strength, good molding performance, good processing performance andhigh use values.

The invention discloses a switch cabinet condensation prevention device comprising a cabinet body. The outer surface of the cabinet body is provided with a heat preservation layer. The top of the inner side of the cabinet body is conical, and the inner wall of the cabinet body is provided with multiple grooves along the vertical direction. The lower part of the cabinet body is provided with inclined drain holes. The grooves are internally provided with cold iron bars. Semiconductor refrigeration sheets are arranged between the cold iron bars and the grooves. The inner wall of the cabinet bodyis provided with a first temperature sensor. The cabinet body is internally provided with a dew point instrument which is used for detecting the inner air temperature. The outer surface of the electrical equipment in the cabinet body is provided with a second temperature sensor. The cabinet body is internally provided with a drying mechanism which is used for drying the electrical equipment. The cold iron bars of which the temperature is lower than that of the surface of the electrical equipment in the switch cabinet can be provided and the condensation phenomenon is enabled to occur on the surface of the cold iron bars by priority so that the probability of condensation on the electrical equipment in the switch cabinet can be greatly reduced; besides, the electrical equipment can be driedby using the drying mechanism in the cabinet body so as to further avoid the condensation phenomenon on the electrical equipment.

The invention discloses a polypropylene composite material with high strength and acid and alkali resistance. The polypropylene composite material is prepared from the following raw materials in partsby weight: 100 parts of polypropylene, 10-20 parts of octa-(N-cyclohexyl) acylamino polysilsesquioxane, 0.1-0.5 part of nucleating agent and 0.5-2 parts of antioxidant; melt index of polypropylene measured on the basis of GB/T3682-2000 process is 15-20g/10min; a mixture of DBS nucleating agent, arylamine nucleating agent and aryl phosphate nucleating agent is served as the nucleating agent, wherein the mass ratio of DBS nucleating agent to arylamine nucleating agent to aryl phosphate nucleating agent is at 100:(10-30):(3-5); one or more of antioxidant 1076, antioxidant 1024, antioxidant 1010and antioxidant 168 is served as the antioxidant. Through research, the invention accidently finds that the mixture of DBS nucleating agent, arylamine nucleating agent and aryl phosphate nucleating agent at specific mass ratio is capable of synergistically promoting acid and alkali resistance of polypropylene and is capable of further promoting the strength of polypropylene especially under the use environment under higher temperature.

A vehicle-mounted substation includes tractors and trailers, A substation main body is arrange on that trailer, a protective frame is cover on the substation main body, a protective mechanism is arranged on the upper part of the front end of the trailer to avoid the cable hung up above the substation main body during transportation, and a binding mechanism is arranged on the trailer and on the left side of the protective mechanism to collect and bind the cable; A protection mechanism includes a platform disposed on a front side of the protective frame, The left automatic lifting lever and theright automatic lifting lever arranged side by side on the platform, the left top block arranged at the upper end of the left automatic lifting lever, the right top block arranged at the upper end ofthe right automatic lifting lever, the roller wheels arranged at the left and right ends of the top of the protective frame, and the conveyor belt sleeved on the two roller wheels. The invention has the advantages of high automation, convenience and flexibility, meanwhile, the loose cables can be tied together and the cables hung above the substation body during transportation can be avoided.

The invention discloses a preparation method of reverse copper foil. The preparation method of the reverse copper foil comprises the following steps of electrolytic bath arrangement, addition agent addition, stirring operation, primary electroplating operation, primary roughening operation, primary curing operation, secondary electroplating operation, secondary roughening operation, secondary curing operation, cleaning operation, anti-oxidation treatment and drying operation. A titanium iridium anode plate and a titanium roller are adopted, an electrolytic solution is used in an electrolytic bath, specifically, the copper content of the electrolytic solution ranges from 130g/L to 220g/L, and the sulfuric acid content of the electrolytic solution ranges from 70g/L to 100g/L. When addition agents are added, the electrolytic solution is heated to enable the temperature to range from 45 DEG C to 50 DEG C, and 5-10 parts of WH-001 addition agents, 3-5 parts of WH-002 addition agents and 2-3parts of WH-003 addition agents by mass are added to 1000 parts of electrolytic solutions by volume every hour. When the secondary electroplating operation is conducted, 5-10 parts of WH-004 additionagents by mass are added. When the secondary roughening operation is conducted, 5-15 parts of WH-005 addition agents by mass are added, and the secondary roughening operation is accomplished. By theadoption of the technology, the potential barrier of metal nucleation is reduced, the nucleation speed is increased, high-density copper particle crystals can be formed on the surface of the copper foil, the non-uniformity degree of the surface is reduced, the mechanical property of the copper foil is improved, and therefore the tensile strength and the peeling resistance strength of the copper foil are improved.

The invention discloses a composition for enhancing dimensional stability of an HDPE water supply pipe, wherein the composition comprises the following raw material components in parts by weight: 100 parts of polyethylene resin, 1-15 parts of a metal salt nucleating agent, 5-15 parts of a silane coupling agent, 2-10 parts of a compatibilizer, and 0.1-1 part of an antioxidant. In the technical scheme of the invention, through mutual cooperation and combined action of the various components, the obtained composition has an obvious effect on enhancing the dimensional stability of the HDPE water supply pipe, the processing technology is simple and easy to control, and other properties of the water supply pipe keep similarly excellent.

The invention relates to a preparation method of perdeuterated CL-20, and belongs to a synthesis technology of a deuterated energetic material. According to the method, deuterated N,N'-di-tert-butyl ethane-1,2-diimine and deuterated benzylamine are used as raw materials, deuterated acetic acid is used as a catalyst to synthesize an intermediate product that is deuterated hexabenzyl hexaazaisowurtzitane. Compared with a traditional method, the yield of the deuterated hexabenzyl hexaazaisowurtzitane is obviously increased; by adopting the deuterated hexaacetyl hexaazaisowurtzitane as a nitrification precursor for nitrification, the product does not contain impurities such as pentanitromonoformyl hexaazaisowurtzitane, and the obtained deuterated CL-20 is high in purity. Compared with common CL-20, the prepared perdeuterated CL-20 has better detonation performance and improved safety and better facilitates practical application.

The invention relates to perdeuterated 2, 4-dinitroanisole and a preparation method thereof, and belongs to the technical field of synthesis of deuterated energetic materials. Deuterated anisole is used as a raw material, and the raw material is relatively easy to obtain; the crude product only needs one purification step, the purity of the obtained product is high, and a standard solution for analysis can be directly prepared to serve as a deuterated internal standard substance for researching the metabolic process. Compared with common 2,4-dinitroanisole, the perdeuterated 2,4-dinitroanisoleprovided by the invention has the advantages that the crystal density is increased; meanwhile, the explosion heat is also increased. The perdeuterated 2,4-dinitroanisole can be used as an insensitivefusion casting carrier explosive, and the solubility of the sample to hexogen at 100 DEG C is increased to 17 g of hexogen dissolved in every 100 g of perdeuterated 2,4-dinitroanisole. The method isrelatively simple to operate, relatively short in reaction period and relatively high in product purity and yield, the preparation of the perdeuterated 2,4-dinitroanisole is realized, and a referenceis provided for industrial production of the perdeuterated 2,4-dinitroanisole.