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 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 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 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.