34results about How to "Little impact on physical properties" patented technology

The invention relates to a preparation method of paraffin wax / AKD complex type neutral paper-making sizing agent. The step is as follows: firstly, AKD and paraffin wax powder are melted in AKD solution; secondly, compound emulsifying agent after being heated is added in melted AKD solution and mixed with a quick shearing mixing machine; thirdly, a rotating speed of the quick shearing blending machine is improved and preheating water is added to lead the formed AKD solution to performing emulsification nearby a W/O to O/W inversion point; quick mixing is performed and the preheating water is added and the mixing is continuously performed; fourthly, the water solution of flocculating agent PAC is added, and the mixing is continuously performed; fifthly, the mixing is stopped and the cold water is used for quickly performing cooling and cool down, and then the finished product of the paraffin wax / AKD complex-typed neutral paper-making sizing agent emulsion is produced. The complex-typed neutral sizing agent produced by the invention has the advantages that the holding rate is high, the effect on the physical property of the paper is small, and the emulsion is stable.

The invention discloses a method for measuring geogrid deformation and stress by utilizing a fiber bragg grating, comprising the following steps: connecting a strain fiber and a sensing fiber with longitude gate or latitude gate of the measured geogrid by adopting a structural adhesive and a banding manner; laying a temperature compensation sensing fiber on the adjacent longitude gates or latitude gates of the measured geogrid; manufacturing a sensing fiber armoring structure; packing geogrid longitude gate or latitude gate laid with sensing fibers by adopting adhesive tapes after the laying of sensing fibers on the measured geogrid is finished; laying and installing the geogrid which is laid with sensing fibers and finishes protection structure in place; one end of sensing fiber bragg grating leads out and is connected with a fiber optic jumper joint to enter into a distributed fiber measuring system. The method of the invention is simple and easily operated, has low cost and can accurately measure the deformation and stress of the geogrid, and the measuring precision can satisfy project actual measuring demands.

The invention relates to a nitrogen-phosphorus expanded halogen-free flame retardant and a polypropylene composite material containing the flame retardant, wherein the flame retardant comprises the following components in percentage by weight: 30-40 percent of melamine cyanurate, 20-30 percent of melamine phosphate amine, 20-25 percent of pentaerythritol and 10-30 percent of hydroxide, wherein the hydroxide is aluminium hydroxide or magnesium hydroxide or the mixture of the aluminium hydroxide and the magnesium hydroxide. Compared with the traditional halogen-free flame retardant polypropylene composite material, the polypropylene composite material prepared from the flame retardant has high flame retardant efficiency, small influence on the physical performance of the finally prepared composite material due to the addition of only a smaller quantity of flame retardant, easier processing process and better thermal stability of the composite material.

The invention relates to a packaging membrane with large heatproof scope and flame retardation used for a vacuum insulation board and the vacuum insulation board by using the packaging membrane, and more specifically relates to the packaging membrane of a hot melt adhesive layer formed by employing ETFE. The packaging membrane comprises a protection layer, an air partition layer and the hot melt adhesive layer, the hot melt adhesive layer is an ETFE material layer, wherein the thickness is 15-95mum. The ETFE has little physical attribute influence to most chemical substances, has low permeability to common gas and steam, is in favor of increasing the isolation gas moisture performance of a membrane material, and is in favor of increasing comprehensive quality of VIP and prolonging its life span; ETFE flame retardation effect is better, and the flame resistance performance of the produced composite membrane is better.

The invention relates to an oligomer type high-phosphorous-content polyphosphonate halogen-free flame retardant and a preparation method thereof. The preparation method includes: allowing a certain mole proportion of dihydroxymethyl methyl phosphine oxide and dimethyl methylphosphonate to have reaction for 4-7 hours under nitrogen protection, the effect of a catalyst and the temperature of 90-120DEG C, and performing pressure-reducing reaction for 0.5-2 hours under 120-150 DEG C to obtain the oligomer type high-phosphorous-content polyphosphonate halogen-free flame retardant. The oligomer type high-phosphorous-content polyphosphonate halogen-free flame retardant has the advantages that high-phosphorous-content polyphosphonate is oligomer, active hydroxyl functional groups in the structurecan well compatible with polymer materials, and migration cannot occur easily; the active hydroxyl functional groups can be combined with the polymer materials to form the flame-retardant material, and product stability and high decomposing temperature are achieved; the flame retardant is wide in application range and suitable for being used as the flame retardant of polyolefin, polyurethane, epoxy resin, unsaturated resin and leather. The preparation method is simple in process, low in equipment investment and easy to achieve industrial production.

The invention discloses a high-opacity white or light flame-retardant polypropylene composition and a preparation method thereof. The high-opacity white or light flame-retardant polypropylene composition comprises, by weight, 35-75 parts of polypropylene resin, 3-5 parts of environment-friendly phosphorus, nitrogen and bromide composite flame retardant, 15-40 parts of opacifying agent A, 0.01-0.1part of opacifying agent B, 0.2-1 part of antioxygen, 0.3-1 part of lubricant and 0.1-1 part of white or light toner. By the aid of the efficient environment-friendly phosphorus, nitrogen and bromidecomposite flame retardant, the composition meets requirements for vertical combustion V2 grade of a UL94 flammability standard, by matching of the opacifying agent A and the opacifying agent B, extremely low transmission of light of the composition is realized, and the composition can be prepared into high white or various light colors. By utilizing the environment-friendly flame retardant, low toxicity and low smoke effects can be realized during combustion, mechanical property of the composition can be kept well, and the composition is applicable to preparation of various white or light products requiring flame retardant and lightproof effects.

The invention discloses a novel flame-retardant thermoplastic polyurethane plastic (flame-retardant TPU), and components, preparation and application thereof. Specifically, the flame-retardant TPU disclosed by the invention comprises polyether type TPU and polyester type TPU, the TPU flame retardant disclosed by the invention comprises an ionic liquid component, and the ionic liquid can be a single ionic liquid component, can be shared by several ionic liquids, and can also be a mixture of the ionic liquid and a traditional flame retardant. The flame-retardant TPU plastic plate disclosed by the invention can be applied to the fields of automobiles, buildings, national defense, aviation and the like.

The invention discloses a flame-retardant irradiation cross-linked polyethylene foam material, which comprises the following components: 35-45 parts of low-density polyethylene, 5-15 parts of linear low-density polyethylene, 5-15 parts of high-density polyethylene, 10-15 parts of a polyolefin elastomer, 2-10 parts of a foaming agent, 2-10 parts of a foaming aid, 0.5-5 parts of a cross-linking agent, 5-20 parts of decabromodiphenyl ethane, 1-10 parts of antimony trioxide, 4-8 parts of magnesium hydroxide, 1-10 parts of talcum powder and 1-5 parts of a compatibilizer, wherein under the condition of 190 DEG C*2.16 kg, the melt index of the low-density polyethylene is 1-3 g/10 min, the melt index of the linear low-density polyethylene is 2-6 g/10 min, and the melt index of the high-density polyethylene is 7-22 g/10 min. According to the invention, the flame-retardant irradiation cross-linked polyethylene foam material is simple in preparation process, and the obtained product is good in size stability, cell compactness and uniformity, non-toxic, free of peculiar smell and excellent in flame retardance.

The invention discloses a layer-stranded strip-shaped optical cable. The layer-stranded strip-shaped optical cable comprises five optical fiber parts and a first metal reinforcing core, the optical fiber parts are uniformly distributed in an insulating layer, and the first metal reinforcing core is arranged in the middle of the insulating layer; a water stopping layer is arranged outside the insulating layer, an inner sheath is arranged outside the water stopping layer, a reinforcing layer is arranged outside the inner sheath, and an outer sheath is arranged outside the reinforcing layer; eachoptical fiber part comprises an accommodating part and an optical fiber belt, an insulating inner layer covers the periphery of each optical fiber belt, the optical belts are arranged in rectangulargrooves, filling layers are arranged among the rectangular grooves and the optical fiber belts, shielding layers are arranged outside the rectangular grooves, and reinforcing cores are arranged amongthe rectangular grooves and the shielding layers. The layer-stranded strip-shaped optical cable has good stretch resistance, water resistance, a good fire retardant effect, a large transmission capacity, a high speed, and good interference resistance, and is suitable for an occasion in which a large-scale network is built.

The invention relates to the technical field of inorganic flame retardant materials, in particular to an ultrafine modified magnesium hydroxide flame retardant and a preparation method thereof. The superfine modified magnesium hydroxide flame retardant is prepared from the following preparation raw materials in parts by weight: 30-50 parts of an alkaline precipitator, 20-30 parts of magnesium salt, 6-8 parts of an activating agent, 8-12 parts of a surfactant and 1-3 parts of a dispersing agent. The superfine modified magnesium hydroxide flame retardant prepared by the invention has the advantages of higher flame-retardant efficiency, favorable compatibility with materials, higher cost performance, environment friendliness and no toxicity.

The invention discloses a composite ribbon optical cable. The optical fiber comprises a first optical fiber part, a second optical fiber part, a third optical fiber part and a first metal reinforcingcore; the first optical fiber part, the second optical fiber part and the third optical fiber part are uniformly distributed in an insulating layer; a first water blocking layer is arranged outside the insulating layer, a first shielding layer is arranged outside the first water blocking layer, a reinforcing layer is arranged outside the first shielding layer, and an outer sheath is arranged outside the reinforcing layer; the first optical fiber part comprises a containing part and an optical fiber ribbon, the containing part is a rhombic frame body, a second metal reinforcing core is arrangedin an inner cavity of the rhombic frame body, and a PE cushion layer is arranged outside the second metal reinforcing core; the rhombic frame body comprises a first side edge, a second side edge, a third side edge and a fourth side edge, and the first side edge, the second side edge, the third side edge and the fourth side edge are each provided with a rectangular groove; the optical fiber ribbonis arranged in the rectangular grooves. The tensile property and water resistance of the optical fiber are good, and meanwhile, the optical fiber is good in flame-retardant effect, high in transmission capacity, high in speed, good in anti-interference performance and suitable for being applied to occasions with large-scale networks.

The invention relates to the field of biomedicine, in particular to application of an umbilical artery in preparation of a vascular graft material for coronary artery bypass grafting and a method for preparing the vascular graft material for coronary artery bypass grafting. The feasibility of applying the umbilical artery to coronary artery bypass grafting is discussed from the aspects of the physiological anatomical structure of the umbilical artery, the antigenic removal and anti-calcification treatment effect, animal experiments and the like, and a new vascular transplantation material source is found for coronary artery vascular reconstruction. Test results show that the umbilical artery can meet the requirements of being used as a blood vessel transplantation material for coronary artery bypass grafting in the aspects of physiological anatomical structure and physical performance; the diameter of the umbilical artery can be increased through hydraulic expansion, spasm is prevented, and obvious damage to the vascular structure is not caused. After the umbilical artery is treated by adopting a liquid nitrogen profound hypothermia and glutaraldehyde (GA) method, the antigenic and anti-calcification effects are good, the influence on the physical properties of blood vessels is relatively small, and the method is easy to implement and can be stored for a relatively long time.

The invention relates to the technical field of polyester colored gauze finishing, and discloses an alkaline finishing method for low-gram-weight polyester colored gauze, which comprises the following steps: immersing the low-gram-weight polyester colored gauze into an alkaline finishing agent, heating to 100-110 DEG C, preserving heat for 10-30 minutes, cooling, taking out and drying; the gram weight of the low-gram-weight polyester colored gauze is 85-125g/m < 2 >; the alkaline finishing agent comprises hydrogen peroxide and liquid caustic soda, and the pH is 8-10. The alkaline finishing agent hydrolyzes fiber ester bonds, and fibers on the surface of the low-gram-weight polyester color gauze generate an alkaline etching effect, so that the surface of the color gauze becomes smooth, the phenomena of yarn cracking and stitch slipping are avoided, and the product quality is improved; the mechanical property of the finished low-gram-weight polyester colored gauze is still good, and particularly, the tensile strength and the wear resistance of gray fabric are optimal; the finishing time can be shortened, and the purposes of saving energy, reducing consumption and reducing cost are achieved.

The invention discloses a gas blocking agent and a preparing method and application thereof. The main component of the gas blocking agent is modified calcium carbonate. The gas blocking agent is a novel material formed in the manner that the surface of the superfine calcium carbonate is processed by a coupling agent and a dispersing auxiliary. The gas blocking agent has a slabbed structure and is high-quality fine-layer sheet structure powder. The preparing method is simple, raw materials are easy to obtain, and cost is low. The gas blocking agent is applied to tire air impervious liner sizing materials. The physical performance of the sizing materials is hardly affected after 10-40 parts of gas blocking agent is added to the air impervious liner sizing materials, bubbles are obviously reduced during attachment, cord fabric and the air impervious liner sizing materials can be bonded very well, the lamination processing performance is improved, and due to the fact that the gas blocking agent is added to the air impervious liner, the air impermeability of a finished inner tube can be improved, and the sizing material cost can be reduced.

The invention discloses an anticorrosive coating for nano metal and a preparation method of the anticorrosive coating. The anticorrosive coating comprises a polymer coating and a two-dimensional material coating, the polymer coating is arranged on the surface of an easily oxidized precious metal nano structure, and the polymer and two-dimensional material nano coating is formed on the surface of the metal nano structure after a two-dimensional material is transferred. The polymer coating is any one of a polyvinylpyrrolidone (PVP) layer, a polymethyl methacrylate (PMMA) layer and a polydimethylsiloxane (PDMS) layer, and the two-dimensional material is graphene or hexagonal boron nitride (hBN). The polymer and two-dimensional material mixed coating prepared by the invention can protect an easily oxidized metal nano material, and is beneficial to the long-term stable use of the nano structure.

The invention discloses low-smoke-amount flame-retardant optical cable factice. The factice comprises, by mass, 78-85 parts of base oil, 9-12 parts of composite thickener, 0.8-1.5 parts of flame retardant and 0.5-0.8 part of antioxidant. The base oil is hydrogenated paraffin base oil and hydrogenated naphthene base oil mixed oil, and the mass ratio of hydrogenated paraffin base oil to hydrogenatednaphthene base oil is (2-2.5):(3-4.2); the composite thickener comprises polyacrylamide and fatty alcohol-polyoxyethylene ether, and the mass ratio of polyacrylamide to fatty alcohol-polyoxyethyleneether is (5-6):(7-8); the flame retardant comprises triallyl isocyanurate and nano tin powder, and the mass ratio of triallyl isocyanurate to the nano tin powder is (90-100):(0.15-0.2). The factice solves the technical problems that optical fibers are easy to combust and release a large amount of toxic smoke and toxic gas in combustion. The low-smoke-amount flame-retardant optical cable factice isprovided, the high-molecular reaction type flame retardant is added, the factice does not contain halogen-free flame retardant, the smoke amount is low, and the performance of the factice is not influenced.