43results about How to "Reduce droplet" patented technology

The invention relates to preparation of a nitrogen-phosphorus expanded type flame retardant and a method for application in preparing an aqueous polyurethane coating. The method comprises the following steps: mixing dimethyl phosphate, and alkali catalysts, namely sodium methoxide and acrylamide, performing a reaction so as to obtain an intermediate, adding a charcoal formation agent and a substance A, keeping the pH value of the solution to 6.5-7.0 in the stirring process, further adding a substance B and a substance C, performing a continuous stirring reaction, and performing concentration so as to obtain the nitrogen-phosphorus expanded type flame retardant; and preparing the aqueous polyurethane coating from the nitrogen-phosphorus expanded type flame retardant. By adopting the flame retardant provided by the invention, flame can be rapidly choked, and the flame retardancy of the nitrogen-phosphorus expanded type flame retardant can be improved by releasing smoke, controlling flamecombustion time and controlling densities of charcoal layers. In addition, the nitrogen-phosphorus expanded type flame retardant is grafted with polyurethane, so that the flame retardancy of the polyurethane can be further improved.

The invention discloses droplet-resistant flame-retardant polyester. The flame-retardant polyester is prepared by random copolymerization of a branched monomer, terephthalic acid or dimethyl terephthalate, ethylene glycol and flame-retardant monomer, wherein the branched monomer is an aliphatic compound or aromatic compound having three or more functional groups; and the flame-retardant monomers adopts any of the following structures. The invention also discloses a method for preparing the droplet-resistant flame-retardant polyester, a nanometer compound material containing the droplet-resistant flame-retardant polyester and a method for preparing the nanometer compound material. Because the droplet-resistant flame-retardant polyester provided by the invention simultaneously contains the branched monomer and the fire retardant having the droplet-resistant effect, the melt viscosity of the droplet-resistant flame-retardant polyester at the high temperature is greatly improved, the sensitivity of the droplet-resistant flame-retardant polyester to temperature is lowered, and the droplet-resistant effect is good; because of the nanometer effect and the blocking effect, the nanometer compound material shows better droplet-resistant effect; and the polyester and the nanometer compound material can be directly used as raw materials for preparing fibers, engineering plastics, films and the like.

The invention discloses a flame-retardant polylactic acid material of a ternary composite flame-retardant system and a preparation method of the flame-retardant polylactic acid material. The ternary composite flame-retardant system comprises hibiscus cannabinus, nano-zinc oxide and a polymer type phosphorus-containing fire retardant. The preparation method of the flame-retardant polylactic acid material comprises the following steps: (1) performing alkali treatment on the hibiscus cannabinus, and assembling and loading the nano-zinc oxide on the processed hibiscus cannabinus surface; (2) dissolving the polymer type phosphorus-containing fire retardant in chloroform, adding the hibiscus cannabinus loaded with the nano-zinc oxide in the chloroform containing the polymer type phosphorus-containing fire retardant, stirring for a while, adding polylactic acid particles, and when the polylactic acid is completely dissolved and the solution is free of bubbles, forming film on a glass plate, volatilizing at room temperature, and drying; (3) adding the dried thin film in a twin-screw extruder, extruding, cooling and pelletizing the material to prepare the flame-retardant polylactic acid material of the ternary composite flame-retardant system. The flame-retardant polylactic acid material is simple in formula, free of halogen, environment-friendly and high in flame retardant efficiency, can reduce molten drop phenomenon, and effectively reduces further spreading of fire.

The invention relates to a system for assembling a flip chip assembly. An underfill resin is dispensed at multiple semiconductor die edges such that vacuum suction provided at a substrate through hole located beneath a stage enables spread of underfill resin from each edge simultaneously for quicker spread and reduction of voids. The excess underfill resin suctioned through the through hole on the underside of the semiconductor die is attracted to reusable tape. The attracted underfill resin is cleaned from a rotating head mechanism by a cleaning pad positioned beneath a lower surface of the head.

The invention discloses high-magnetoconductivity soft magnetic alloy powder. The alloy consists is prepared from the following components in parts by mass: 25.0 to 80.0 parts of Fe, 3.0 to 8.0 parts of Si, 15 to 55 parts of Ni, 1.0 to 7.0 parts of B and 1.0 to 5.0 parts of P. The invention further discloses an inductance piece prepared from the high-magnetoconductivity soft magnetic alloy powder, a preparation method of the high-magnetoconductivity soft magnetic alloy powder and a preparation method of the inductance piece. By the adoption of the preparation method disclosed by the invention, the soft magnetic alloy powder with various particle sizes can be prepared, and the soft magnetic alloy powder is high in magnetoconductivity, lower in power loss, higher in apparent density, high in tap density, lower in oxygen content, high in product pressing performance and high in magnetic ring density. Due to small oxygen content, few impurities, small carbon content, uniform alloy components and high sphericity degree, the high-magnetoconductivity soft magnetic alloy powder can be widely used as a raw material of a novel sintered inductor.

The invention discloses iron-silicon-chromium soft magnetic powder, a preparation method and application thereof. The preparation method comprises the following steps: 1) iron-silicon-chromium soft magnetic alloy powder raw materials are added in a medium-frequency induction furnace for atmospheric smelting to obtain alloy liquid; and 2) under the condition of nitrogen protection, the alloy liquid is fed in an atomization tower; in the feeding process, two atomization mediums of ultrahigh-pressure atomization water and low-pressure vortex gas synchronously acts on the alloy liquid; and the alloy liquid is strongly crushed as a lot of fine metal molten drops, and is cooled and condensed as the iron-silicon-chromium soft magnetic alloy powder. The iron-silicon-chromium soft magnetic powder with high loose packing density, high tap density, low oxygen content and higher inductance value and magnetic conductivity can be prepared; and the iron-silicon-chromium soft magnetic powder can serve as a raw material of a micro inductor, and is widely applied.

The invention discloses in-situ polymerization type N-P synergistic flame-retardant nylon and a preparation method thereof. The preparation method provided by the invention particularly comprises the following steps: (A) carrying out a reaction between organic phosphorus flame-retardant monomers and diamine monomers to form salt; (B) emulsifying a nitrogen flame retardant and dispersing to obtain nitrogen flame retardant emulsion; (C) adding diacid and diamine or binary amide salt or a solution thereof, the prepared salt or a solution thereof, the nitrogen flame retardant emulsion, an antioxidant and a catalyst into a reaction kettle, and performing in-situ polymerization under the inert atmosphere by regulating and controlling reaction temperature and pressure intensity to prepare the required N-P synergistic flame-retardant nylon. The N-P synergistic flame-retardant nylon prepared by the method reduces the total amount of the required added flame retardant due to the synergistic effect. The viscosity can be controlled in the whole preparation process, a product with excellent mechanical property and flame retardance can be obtained, the vertical combustion test can reach UL-94 V-0 level, and the limit oxygen index is 28 percent or higher.

The invention discloses an in-situ polymerization type N-P synergistic flame-retardant nylon and a preparation method thereof. The preparation method comprises the following steps: (1) reacting an organophosphorus flame-retardant monomer with a diamine monomer to form salt; (2) emulsifying and dispersing a nitrogen flame retardant, so as to obtain a nitrogen flame retardant emulsion; and (3) adding a lactam monomer, the salt prepared in the step (1), an antioxidant, the nitrogen flame retardant, a catalyst and a molecular weight adjusting agent into a reaction kettle, and performing in-situ polymerization by regulating reaction temperature and pressure under inert atmosphere, so as to obtain the needed N-P synergistic flame-retardant nylon material. According to the prepared in-situ polymerization type flame-retardant nylon, the content of the flame retardant needing to be added is reduced due to the synergistic effect, the viscosity during the whole preparation process is controllable, the product with both excellent mechanical performance and flame-retardant performance can be obtained, the vertical burning test can achieve the UL94 V-0 grade, and the limiting oxygen index is more than 28%.

The invention discloses a method for preparing flame-retardant polyurethane synthetic leather. The method comprises the following steps: extruding a thermoplastic polyurethane and styrene-butadiene-styrene segmented copolymer, a styrene-ethylene-butene-styrene segmented copolymer, a polyamide type thermoplastic elastomer, colorant and a substance A by using an extruder at 90-370 DEG C so as to prepare a polyurethane film which is 0.8mm in thickness; before the modified polyurethane film is cooled, performing composite pressing on the polyurethane film and a piece of flame-retardant base cloth by using an extrusion roller at the pressure of 1.0Mpa, embossing by using a roller with textures at the pressure of 0.2Mpa, cooling so as to prepare primary synthetic leather, performing surface treatment on the prepared primary synthetic leather in a water-soluble silicon oil solution of 90 DEG C, and drying in an oven of 110 DEG C, thereby obtaining the flame-retardant polyurethane synthetic leather. The flame retardancy of the prepared flame-retardant polyurethane synthetic leather can be of a grade of good or higher.

The invention discloses a water-based formaldehyde-free adhesive for a flame-retardant composite board and a preparation method thereof. The adhesive is mainly prepared from a fumaric acid-aluminum complex, a 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide compound, a microencapsulated isocyanate and defatted bean flour. During high-temperature combustion, isocyanate generated by decomposition of defatted bean flour and isocyanate generated by decomposition of polyurethane react with fumaric acid to form an imine structure, the 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and the imine structure are subjected to an addition reaction to generate a nitrogen-containing compound, the nitrogen-containing compound is thermally decomposed during combustion to generate ammonia inert gas, the combustible gas concentration and the combustion rate are reduced; the nitrogen-containing compound is subjected to a nitrogen-containing reaction to form a nitrogen-containing flame retardant, and the concentration and combustion rate of combustible gas are reduced. The nitrogen-containing compound is combusted to form a carbon layer, molten drops are reduced, and the flame retardant property is improved. The adhesive prepared by the method improves the water resistance on the basis of a water-based adhesive, does not contain aldehyde groups, does not release formaldehyde to pollute the environment, has good flame retardant property, can effectively slow down the combustion rate of the composite board, and has very high practicability and production value.

The invention relates to a method for producing a flame-retardant fiber from a vinylon production line and an obtained flame-retardant fiber. The method comprises the following steps: a) dissolving polyvinyl alcohol in water so as to obtain a spinning solution; b) adding an aqueous solution of a tetrahydroxymethyl phosphorus compound; c) spinning by using a mirabilite wet method, and performing condensation and stretching so as to obtain a primary fiber; d) drying the primary fiber obtained in the step c) so as to obtain a flame-retardant precursor fiber; e) performing ammonia fumigation on the flame-retardant precursor fiber obtained in the step d) so as to obtain an ammonia fumigation fiber; f) oxidizing the ammonia fumigation fiber obtained in the step e); and g) randomly performing washing, oiling and drying, thereby obtaining the flame-retardant fiber.

The invention provides a power distribution type lightning arrester preventing sparks in a pressure release process. When thunder and lightning and overvoltage occur, an overvoltage arc release path is formed by arc control panels under the point effect, overvoltage is rapidly released, and accordingly, lines and the lightning arrester are protected; by means of semi-ring grooves and longitudinalgrooves in the surfaces of upper electrodes, lower electrodes and intermediate electrodes, recombination of the electrodes and a casing is facilitated, adhesive force of the electrodes and the casingcan be improved, damp air is prevented from entering the casing, the risk of flash explosion is reduced, overall mechanical strength can be improved when the upper electrodes, the lower electrodes andthe intermediate electrodes are combined with components such as resistor discs, the casing and the like, bending resistance and torsional strength of the lightning arrester are improved, and the probability of disassembly of the lightning arrester in a pressure release process is greatly reduced; the electrodes are made of stainless steel instead of common aluminum or aluminum alloys, the electrode melting point is increased to 1,360 DEG C or higher from about 660 DEG C, and the probability of melt dropping of the electrodes is reduced.

The invention discloses a method for fiber-reinforced modified wood-plastic decorative plates, the method comprises the following steps: dispersing a silane coupling agent in an ethanol solution, soaking aramid fiber therein, washing with deionized water, and drying in an oven to obtain silane coupling agent modified ammonium polyphosphate; adding organically modified zirconium phosphate and n-butylamine into deionized water, oscillating in a water bath, adding carboxymethyl chitosan, stirring at constant temperature under microwave, washing with deionized water and ethanol, centrifuging, anddrying under vacuum to obtain modified zirconium phosphate; drying regenerated high density polyethylene, putting into a mixer for mixing and melting, adding an antioxidant, silane coupling agent modified ammonium polyphosphate, the silane coupling agent modified ammonium polyphosphate and the modified zirconium phosphate, finally adding modified wood flour for uniform mixing, paving in a mold, putting into a hot press for preheating, starting hot pressing, and then putting into a cold press for cold pressing to prepare the wood- plastic decorative plate.

The invention discloses a thermotropic aromatic liquid crystal copolyester and a preparation method thereof, the thermotropic aromatic liquid crystal copolyester comprises a main chain formed by copolymerization of a rigid mesogenic unit and polyester granules, and an end sealing group is a phenylacetylene or norbornene acetylene group; the mesogenic unit is prepared from resorcinol, terephthalic acid and 2, 7-naphthalic acid; and 4 '-hydroxybiphenyl-4-carboxylic acid contains a terminal carboxyl group A and a terminal hydroxyl group B at the same time. The thermotropic aromatic liquid crystal copolyester disclosed by the invention has lower melting processing temperature and flame-retardant anti-dripping performance, and can effectively reduce life and property loss caused by fire, so that the thermotropic aromatic liquid crystal copolyester has a wide application prospect in the fields of civil textiles and high-temperature protective materials, in addition, the molecular weight is controllable in the polymerization process, the preparation process is simpler, more convenient, efficient and environment-friendly, and no harmful gas is generated during combustion.