30results about How to "Effect on physical properties" patented technology

The invention discloses sulfide tetrabenzyl thiuram and a preparation method and application thereof. The preparation method comprises the following steps: enabling dibenzylamine, sodium hydroxide and carbon disulfide to react in a solvent to generate an intermediate sodium dibenzyldithiocarbamape, then oxidizing the sodium dibenzyldithiocarbamape into the disulfide tetrabenzyl thiuram by use of hydrogen peroxide, and then desulfurizing the disulfide tetrabenzyl thiuram by use of hydrogen to obtain the sulfide tetrabenzyl thiuram. The sulfide tetrabenzyl thiuram disclosed by the invention is high in purity, high in melting point, and white in appearance, the vulcanization rate can be obviously accelerated, the sulfide tetrabenzyl thiuram can express good scorching security and fast vulcanization performance whether to increase the vulcanization temperature and change the sulfur dosage or to add the white carbon black, and the use of the sulfide tetrabenzyl thiuram has no bad influence to the physical performance of the sulfide rubber.

The invention discloses an optical fiber wiredrawing technology. The optical fiber wiredrawing technology comprises the following steps: 1) a melting and wiredrawing procedures: melting a preformed rod at 2200 DEG C to 2300 DEG C, drooping by self gravity and carrying out wiredrawing; 2) a shaping and cooling procedure: cooling melted and drooped wires of the preformed rod in a shaping pipe to 500to 600 DEG C; 3) a wiredrawing cooling procedure: further cooling the wires through helium gas in a cooling device to 30 DEG C to 80 DEG C, wherein the cooling device in step 3) comprises a cooling pipe, the cooling pipe is composed of a first side pipe and a second side pipe, which have the same structure, a mounting cavity is formed between a metal wall and a heat-insulation cover, the metal wall is concave in a direction opposite to the heat-insulation cover, the grooves of one pair of the side pipes are spliced to form a cooling chamber, each groove comprises a foldable groove and each foldable groove is internally provided with a guide blade. According to the optical fiber wiredrawing technology disclosed by the invention, the cooling chamber formed by structures including the grooves, the foldable grooves, the guide blades and the like is arranged, so that the turbulent flow is increased and the thickness of a laminar flow bottom layer formed by downward movement belts of optical fiber wires is effectively reduced, and furthermore, the helium gas cooling effect is improved.

The invention relates to a jet layup board-producing system. The jet layup board-producing system comprises a woolen blanket, a slurry stabilizing filter tank, a plurality of jet-type slurry spreadingmoulding machines, a colorant adding machine, a cloth puncher, a woolen blanket flushing assembly, a vacuum water suction box and a plurality of supporting rolls, wherein the slurry stabilizing filter tank is arranged beside the woolen blanket; each jet-type slurry spreading moulding machine comprises a jetting device and a moulding device; each jetting device comprises a support, a driving motor, a feed pipe, a balancing valve, a stirring propeller, a slurry jetting head, a dispersing component and a flow control assembly; each moulding device comprises a machine frame, a first dewatering assembly, at least one second dewatering assembly, a first cylindrical net cage, a first couch roll, a moulding cloth belt, an upper water receiving tank body, a lower water receiving tank body, a flushing assembly and a plurality of guide rolls; the colorant adding machine comprises a colorant tank, a second cylindrical net cage, a swinging rod, a colorizing roll, colorizing net cloth and a secondcouch roll; and the cloth puncher, the woolen blanket flushing assembly and the vacuum water suction box are arranged beside the woolen blanket. The jet layup board-producing system has the advantagesof a good shaping effect, low production cost, high reliability, high processing quality and the like.

The invention discloses a composite dispersion method for polyimide chopped fibers, which belongs to the technical field of dispersion mechanism. The dispersing method of the present invention comprises the following steps: (1) adopt acid to carry out surface modification: polyimide chopped fiber is added in the acid solution to carry out surface modification, afterwards washing, drying; (2) use hexamethylenediamine Carry out surface grafting: add cationic surfactant to hexamethylenediamine solution, mix well to obtain a mixed solution; add polyimide chopped fibers treated with acid surface modification to the mixed solution for surface grafting, after the reaction , to obtain a fiber suspension; (3) ultrasonically treating the fiber suspension to obtain a uniformly dispersed polyimide chopped fiber suspension. The dispersion degree of the fiber suspension obtained by the invention can be as high as 45%, which is beneficial to the preparation of high-performance polyimide paper.

The invention relates to a transparent halogen-free flame-retardant polycarbonate resin. The resin comprises the following components in percentage by weight: 98.4-99.75% of flame-retardant master batches, 0.05-0.6% of a fire retardant, 0.1-0.5% of an antioxidant and 0.1-0.5% of a lubricant. The preparation method comprises the following steps: preparing materials according to the components, adding PC, the fire retardant, the antioxidant and the lubricant in percentage by weight into a high-speed mixing machine, sufficiently mixing the PC, the fire retardant, the antioxidant and the lubricant, and placing the PC, the fire retardant, the antioxidant and the lubricant, which are mixed, into a screw rod machine for extruding and pelleting so as to obtain flame-retardant master batches; adding the flame-retardant master batches and the rest of the components into the high-speed mixing machine together, sufficiently mixing the flame-retardant master batches and the rest of the components, and then placing the flame-retardant master batches and the rest of the components, which are sufficiently mixed, into the screw rod machine for extruding and pelleting so as to obtain products. Compared with the prior art, the method disclosed by the invention fully uses phenyl butyl sulfonic acid potassium as the fire retardant, after the fire retardant, the antioxidant, the lubricant and the flame-retardant master batches are mixed, extruded and pelleted, the whole preparation technology is simple, a complex ladder temperature control step is not needed, the obtained products have the characteristics of transparence, thin walls, high impact strength, excellent flame retardant property, zero toxicity and zero harm, and the application range is wide.

The invention provides a small molecular phenol modified PBAT method, which belongs to the technical field of polymer modification. The method comprises the following steps: (1) esterification reaction: placing the reactant in a reactor, stirring evenly, adding a catalyst to carry out esterification reaction to obtain a prepolymer; (2) melt polycondensation reaction: adding to step (1 ) in the prepolymer obtained by adding a modifying agent to carry out melt polycondensation reaction, after cooling, modified PBAT is obtained; The mixture of methane acts as a modifier to form hydrogen bonds with the ester groups in the prepolymer to improve the physical properties of the polymer. By controlling 2,2-bis(4-hydroxyphenyl)propane and 4,4-bis The mass ratio of hydroxydiphenylmethane is 1:1, which obviously improves the elongation at break, impact strength and transparency of the polymer; the process of the method is simple and can realize industrialization.

The invention relates to a preparation method of a single crystal ZnS nano-wire, which belongs to the field of preparative technique of semiconductor material. The method comprises the following steps: inletting the mixed gas of argon and hydrogen with a flow rate of 108 to 113ml / min into a tube furnace; putting the ZnS powder in a quartz boat as a evaporation source, and putting the ZnS powder together with the boat in the tube furnace, and putting a cleaned silicon chip in the furnace, which is 25 to 30mm from the evaporation source, wherein the evaporation source is in the direction of inlet airflow while and the silicon chip is in the direction of outlet airflow; heating the tube furnace to 890 to 910 DEG C with the holding time of 80 to 120min and a pressure of 0.015 to 0.03MPa in the furnace. A layer of white ZnS nano-wire film is deposited on the silicon chip when the temperature of the furnace drops to a room temperature. The method requires a low synthesis temperature and does not apply a foreign catalyst. The prepared ZnS nano-wire has a face-centered cubic structure; the length of 10 to 15Mum and a diameter of only 20 to 30nm at the tip. The nano-wire is single crystal with a higher crystalline quality. The preparation method has the advantages of simple and convenient operating process, available raw material, low cost and easy scale production.

The invention provides a spinning method and device of a single-component sheath-core fiber. The spinning device comprises a spinneret plate with a spinneret orifice guide hole; a cone with a spiral smelting channel is installed in the spinneret orifice guide hole of the spinneret plate; the spiral melting channel on the side surface of the cone is of a single-spiral structure, or a double-spiral structure, a three-spiral structure, a four-spiral structure, or a multiple-spiral structure; and the spinneret end part of the spiral melting channel is connected with a spinneret micropore. The spinning method comprises the steps of feeding a spinning melt with functional particles into the spinneret micropore through the high-speed rotation and flowing of the spiral melting channel on the surface of the cone installed in the spinneret orifice guide hole of the spinneret plate, and then injecting and solidifying to obtain the single-component sheath-core fiber. The spinning method and device disclosed by the invention have the characteristics of simpler process and equipment, small energy consumption, low cost and good effect.

The invention discloses a spray-coating flame-retardant polyurethane composite material, which comprises the following components in parts by weight: 50-80 parts of polyester polyol, 5-15 parts of flame-retardant polyether polyol, 20-50 parts of isocyanate, 5-10 parts of joint agent, 0.1-1 part of catalyst, 5-12 parts of chain extender, 3-10 parts of foaming agent and 0.5-1 part of foam stabilizer; the flame-retardant polyether polyol includes flame-retardant polyether Polyol POP3628H and flame-retardant polyether polyol YB-3028, in terms of mass ratio, the mass ratio of the flame-retardant polyether polyol POP3628H to flame-retardant polyether polyol YB-3028 is 1:1 to 3:1 . The flame-retardant polyether polyol is introduced into the polyurethane composite material of the present invention, and the flame-retardant elements are stably combined into the polyurethane matrix, and by optimizing and screening the types and proportions of the flame-retardant polyether polyol, the performance of the polyurethane is significantly improved. Flame retardant performance, and reduce the preparation cost of the flame retardant polyurethane foam material, good flame retardant stability, can maintain the flame retardant effect for a long time, and has no adverse effect on the physical properties of polyurethane.

The invention provides a preparation method of Mn-doped ZnS nano-structure, which belongs to the technology field of semiconductor nano-material preparation. The method is characterized in including adopting a manner of chemical gas deposition, charging mixed gas of the argon gas and the hydrogen gas at a flow rate of 108-113 ml / min into a pipe heater, and evaporating the ZnS powder and the MnCl2 powder in the mixed atmosphere of the argon gas and the hydrogen gas; and heating the pipe heater to 900-920 DEG C, maintaining the temperature for 60-200min and furnace-in pressure of 0.015-0.03MPa, and depositing Mn-doped ZnS nano-structure on a blank silicon wafer. An evaporation source is arranged in an inlet direction of mixed gas stream of the argon gas and the hydrogen gas, the silicon wafer is arranged in an outlet direction of the mixed gas stream of the argon gas and the hydrogen gas, and horizontal distance between the silicon wafer and the evaporation source is 3-6mm. The method is capable of obtaining high purity and high crystalline quality Mn-doped ZnS nano-material without catalyst, and has simple preparation, low cost and easy operation.