93results about How to "Guaranteed impact strength" patented technology

The invention belongs to the technical field of modification of high polymer materials and provides a halogen-free flame-retardant high-gloss inorganic-fiber-reinforced PC / ABS material and a preparation method thereof. The halogen-free flame-retardant high-gloss inorganic-fiber-reinforced PC / ABS material is prepared from raw materials in percentage by weight as follows: 50-55% of PC, 10-20% of ABS, 0-1% of a sulphonate flame retardant, 6-12% of a phosphorus-containing flame retardant, 2.5-5.5% of a compatilizer, 5-10% of a toughening agent, 0.3-2% of a processing aid, 0.1-1% of an antioxidant, 0.1-1% of an anti-ultraviolet agent, 10-20% of inorganic fibers and 0-1% of a metal-imitating toner. According to the halogen-free, flame-retardant, high-gloss and inorganic-fiber-reinforced PC / ABS material, the aid and all the raw materials are reasonably selected and matched, the fibers and the flame retardants are added, through reasonably optimized screw combination, high-gloss, high strength, high rigidity and flame retardant properties are obtained, meanwhile, the halogen-free, flame-retardant, high-gloss and inorganic-fiber-reinforced PC / ABS material has certain impact strength and the reasonable melt flow rate, the reasonable thermal deformation temperature, the reasonable Vicat softening temperature and the like, and a high-gloss mirror effect can be realized.

The invention relates to the technical field of polystyrene composition, particularly to high light-transmittance and high light-shielding polystyrene composition. The high light-transmittance and high light-shielding polystyrene composition is prepared from the following materials by weight: 98.2%-99.6% of polystyrene, 0-1% of silicon light diffusing agent, 0.1-0.2% of a lubricating agent, 0.1-0.2% of a dispersing agent, 0.1-0.3% of antioxidant A and 0.1-0.2% of antioxidant B. The preparation method comprises the steps of uniformly agitating the constituents except for polystyrene by a high-speed mixer; putting the polystyrene and the uniformly mixed materials into the high-speed mixer to carry out three-segment agitation, and extruding and pelletizing the uniformly mixed materials by a double-screw extruder. The polystyrene composition disclosed by the invention is high in light transmittance, high in light shielding property, good in impact strength, good in balance of haze and light transmittance, high in structure strength of the prepared product, simple in process, low in production cost and beneficial for generalization and application.

The invention provides a transparent and toughening polylactic acid resin and method for preparing the same. The polylactic acid resin consists of polylactic acid, methyl methacrylate-butyl acrylate copolymer as the flexibilizer, citrate plasticizer, pentaerythritol toltetranitrate (Benzenepropanoic acid, 3,5-bis(1,1-dimethylethyl)-4-hydroxy-) as the antioxidant and tris (2,4-ditert-butylphenyl) phosphate. First, premix is prepared by mixing polylactic acid, flexibilizer, plasticizer and antioxidant mechanically. Then the premix is subject to melt extrusion and granulation by utilizing double-screw extruder. The above method has the advantages of increasing the anti-impact strength, tensile strength and elongation at break of polylactic acid and maintaining the transparency thereof. In addition, the viscosity of the blends is decreased, thereby remedying the defects of brittleness of polylactic acid and improving the rheological behavior of materials obviously. The impact strength is up to 60.1KJ / M2.The light transmittance and the haze of the products are 89% and 8.5% respectively when the thickness thereof is 0.04mm.The above polylactic acid resin, instead of PE and PVC, is applicable to the preparation of films, plates, sheet materials, foamings and injection moulding plastics.

The invention relates to a high-permeability glass cutter wheel with a chamfer on the side edge of a concave part of a cutting edge. The cutter wheel is provided with a V-shaped cutting edge part, a disc surface and a shaft hole, wherein the V-shaped cutting edge part comprises a first curved surface S1, a second curved surface S2 and an outer edge ridge L. The cutting edge and the concave part are formed on the periphery of the outer edge ridge L of the V-shaped cutting edge part; and a first chambering oblique surface and a second chambering oblique surface which are symmetrical with each other are formed on the side edge of the concave part. Due to the adoption of the structure, the blockage of glass chips in the concave part of the cutter wheel can be avoided or reduced, the cutting pressure is reduced, and a destructive fracture line at the cutting edge of glass is reduced, so that the glass cutting quality is improved, and the service life of the cutter wheel for cutting the glass is improved.

The invention provides ultrathin unequal-thickness glass as well as a production method and application thereof. The production method includes the steps that covering films on the two sides of the glass are protected through protective films, the middle of the glass is exposed and not covered with the covering films, then the covered glass is subjected to spraying acid etching treatment, and in order to achieve the arc-shaped groove effect, the mode of segmented etching and repeated acid-proof film covering is adopted, so that different groove depths can be controlled, and the groove depth is ensured to be uniform. Meanwhile, in order to ensure that the folding area and the non-folding area have a proper chemical toughening effect, the folding area and the non-folding area are respectively protected by adopting a film coating mode, so that a uniform stress layer and a uniform stress value are obtained, excellent bending performance and strong impact resistance of the UTG are ensured to be combined, chemical toughening treatment is performed in the bending area, and the whole foldable UTG product has no chromatic aberration in front view.

The invention discloses a making method of a lightweight rubber shock absorption member for an automobile. The rubber shock absorption member is characterized in that the rubber shock absorption member is composed of a rubber mainspring, a plastic support and a metal insert, and the making method comprises the steps of vulcanization, gluing, drying, assembling, injection molding, cooling and moisture absorption. The method has the advantages of simple technology and low cost, and the lightweight rubber shock absorption member made through the method has a good performance and a long service life.

The invention discloses a stud gear with a cutting edge and a drill thereof, and is suitable for manufacturing a stud gear with a cutting edge and the drill of the stud gear which are used for drilling operations for getting water, mining minerals, petroleum and natural gas, geological drilling operation and the like, as well as rock drilling operations of various civil constructions, wherein the stud gear and the drill thereof can be a roller bit working in a rolling manner, a hole bit and or stud gear bore bit working in a spinning manner. The stud gear comprises a cutting edge which is additional arranged at the side part, the original rotation body structure of the stud gear head is basically maintained, so that the original impact resistance strength is maintained. After the drill disclosed by the invention is adopted, the shortage that the spherical face of the traditional stud gear is easy to wear when used for scraping rocks is basically overcome.

The invention discloses an impact crusher for ore mining. The impact crusher for ore mining comprises a housing, wherein a bottom plate is fixedly connected to the lower end surface of the housing; afixing mounting plate is fixedly connected to the side end surface of the housing; a transmission wheel is rotatably connected to one side, deviated from the fixing mounting plate, of the side end surface of the housing; a conveyor belt is rotatably connected to the outer end surface of the transmission wheel; a motor is rotatably connected to the inner end surface of the conveyor belt; a detecting door is rotatably connected to one side, deviated from the transmission wheel, of the side end surface of the housing; a fixing block is fixedly connected to one side, deviated from the detecting door, of the side end surface of the housing; a feeding port is formed in the upper end surface of the housing; a conveyor belt protecting body is in sliding connection with the upper end surface of thebottom plate; a discharging port is formed in the lower end surface of the housing; a rotating shaft is fixedly connected to the side end surface of the transmission wheel. According to the impact crusher for the ore mining, the conveyor belt is mounted for protecting a crusher body; and the problem that a conveyor belt of a traditional crusher is easily damaged by ore can be solved.

The invention discloses a moveable explosion door for civil air-defense construction. The moveable explosion door comprises at least two door planks, a door frame and a slide slot rack, wherein the door frame is welded with the slide slot rack and is fixed on a concrete wall; the door planks are slidably arranged in the slide slots in the slide slot rack through slide blocks; connecting rod locking mechanisms which are used for locking the door planks on the door frame are arranged on the door planks; buffering strips, which can buffer and prevent collision, are arranged at contact edges of the two door planks; the peripheries of the door planks as well as the door plank and the door plank are all locked through the connecting rod locking mechanisms; stopping blocks for limiting the door planks from continuing to move are arranged at the corners of the door frame and the slide slot rack. The invention aims to provide the moveable explosion door for civil air-defense construction, which has a simple structure, is low in cost, is high in strength and can bear the impact force of about 0.8MPa; the explosion door is capable of horizontally moving; the phenomenon that the door body is tightly blocked and people cannot open can be avoided; the explosion door can be applied to the area in larger pore diameter and is wide in application scope.

The invention provides a compatilizer and a preparation method thereof, and particularly relates to the production of the compatilizer for a polyphenyl ether / polypropylene alloy, wherein the compatilizer is a graft polymer, and is obtained after the grafting reaction of styrene ethylene butadiene segmented copolymer, polyphenyl ether, maleic anhydride monomer, peroxide, initiator and processing aid. The components of the styrene ethylene butadiene segmented copolymer, the polyphenyl ether, the maleic anhydride monomer and the processing aid except the peroxide and the initiator are proportionally placed in a high speed mixer to mix, then the peroxide is fed into a double-screw extruder through a main feeder, the initiator is added into the extruder through a side feeder, and after liquation plasticizing, kneading and mixing, handpiece extrusion, strip drawing, cooling, grain sized dicing and drying, the compatilizer product is obtained. The compatilizer, the polyphenyl ether, polypropylene, flexibilizer and antioxidant are proportionally placed into a mixer to mix, and then are added into the double-screw extruder to plasticize and extrude, so the polyphenyl ether / polypropylene alloy is obtained.

Provided is a packaging case for an electro-optical device product, which can be manufactured by a series of pressing operations so that it can be expected to reduce the cost and which can not only differentiate the durability and the textures but also have a water resistance. The packaging case (A) is constituted by overlapping a body case (1) having a fitting ridge (3) on its periphery and a metal case (2) to be fitted on the periphery of the body case (1). The metal case (2) includes a rising peripheral wall (6) formed by pressing a single sheet of metal, and an elastic member portion (7) formed by folding it back from the folded portion (6a) of the rising peripheral wall (6) along the inner side of the rising peripheral wall (6). The elastic member portion (7) is so formed by undulating it as to have a fitting trough (8) to be closely fitted on the fitting ridge (3) of the body case (1).A pattern (13) is formed on the surface of the metal case (2) by a rolling roll (D).

The invention relates to a filling stent material containing a three-layer structure and suitable for bone repairing and a preparation method of the filling stent material. The bottom end of a bone repairing stent has a multi-stage pore structure with high porosity, can slowly release bioactive factors and improve the inflammatory state of a bone lesion portion, has good biological activity and bone induction ability, and is beneficial to enhancing osteogenesis and bone remodelling; and an upper end is a bone cement matrix barrier layer with low porosity, and a middle layer is an adhesive layer. The composite stent provided by the invention utilizes a barrier effect of an upper layer and an osteogenesis promoting effect of a lower layer, and can effectively promote repairing and regeneration of bone tissues; and besides good adhesion and filling effects, the filling gel auxiliary material also has a bone growth promoting component, and has a synergistic effect with a skeleton.

The invention discloses a corrosion-resistant paint for hydraulic oil tanks. The corrosion-resistant paint for hydraulic oil tanks is a double-component paint formed by mixing a component A and a component B, wherein the component A comprises a modified epoxy resin, a filler, a foaming agent, acetone, an adhesive, a suspending agent, sodium carbonate and a mildew preventive; and the component B comprises a bisphenol A polyetheretherketone resin, a defoaming agent, a leveling agent, a solvent, a cosolvent, a thixotropic agent and a surfactant. The invention also discloses a preparation method of the corrosion-resistant paint for hydraulic oil tanks, which comprises the following steps: preparation of the component A, preparation of the component B, and preparation of the corrosion-resistant paint for hydraulic oil tanks. The preparation method is simple and easy to implement, and has the advantage of low preparation cost. The prepared paint has the advantages of favorable abrasion resistance, favorable coating property, high impact resistance, favorable adhesive force, favorable flexibility, favorable water resistance and favorable chemical resistance.

The invention provides a lamp testing device, a lamp testing framework and a lamp testing method. The testing framework comprises a frame body and a mounting support, wherein the frame body is a cuboid and has an accommodation chamber for holding lamps to be tested, and reinforced ribs are disposed between diagonal vertexes of at least one side surface of the frame body; the mounting support is arranged between two parallel edges of one side surface of the frame body, and is used for fixing and connecting the lamps to be tested. The arrangement of the mounting support enables impact energy to be transferred to the support of the lamp and to the lamp, so as to test impact resistance capability for the support of the lamp and for the lamp. Special structural designs of the lamp impact-testing frame, such as reinforced ribs, reinforced plates, wrap angle reinforced elements, and the like, can reduce material consumptions under the condition of assuring impact strength, thereby reducing production cost.

The invention discloses a novel polypropylene composite resin composition for an automobile. The novel polypropylene composite resin composition is prepared from, by weight, 40-90% of high-crystallinity polypropylene with the isotactic index of 96% or above, 5-30% of an enhancer containing whiskers and 5-30% of an impact modifier. By compositing high-crystallinity polypropylene with excellent properties with talcum and whiskers, strength and heat resistance are maximized, needed impact strength of an automobile material is ensured, factors influencing strength and other properties are minimized, and the polypropylene resin composition with balanced strength, heat resistance and impact strength is obtained and can be widely applied to manufacturing of automobile interior and exterior decoration products. It is needed to consider the minimum use quantity of whiskers so that influences on the shrinkage rate in the MD / TD can be minimized.

The invention relates to a grinder. The feeding end of a shell is higher than the discharging end, and the diameter of the shell decreases from the feeding end to the discharging end in a stepped mode; and a plurality of guide edges and a plurality of separation rings are arranged on the inner surface of the shell, the separation rings divide the inside of the shell to form a plurality of cavities, each of the cavities is internally provided with a steel ball, and the separation rings are perpendicular to the axis of the shell. The separation rings, the guide edges and material passing holes screen the ground materials in the cavities, the finely ground materials are transferred to the next cavity to be ground, the situation that fine particles absorb the impact energy of the steel balls when being mixed with coarse particles is avoided, the impact strength of the steel balls is ensured, the ground materials can be classified with multiple particle sizes, the steel balls of different proportions are used for grinding materials of different particle sizes, and the grinding efficiency is ensured.

The invention discloses a combined structure of a prefabricated cabin type transformer substation with low cost. A prefabricated cabin is formed by the mutual tenon connection of a plurality of keel section structural beams; the keel section structural beams comprise keel section cross beams, keel section longitudinal beams, keel section vertical beams and bending arms; a plurality of keel section cross beams which are parallel to each other and a plurality of keel section longitudinal beams which are parallel to each other are connected to form a bottom structure of the prefabricated cabin in a tenoning way, and a plurality of keel section vertical beams are connected to a side wall structure of the prefabricated cabin formed by a bottom structure in a tenoning way; a side wall structure of the prefabricated cabin is provided with a plurality of tenoning structure connected with an adjacent prefabricated cabin; the bending beam is inserted above the two side wall structures of the prefabricated cabin, and a plurality of keel section cross beams are respectively connected to a top structure of the prefabricated cabin formed by the bending beam in a tenoning structure; the side wall structures are connected with composite surface wall plates, and a combined steel wire gauze and a protective panel can be utilized to reduce the thickness of the panel and greatly reduce the manufacturing cost of the transformer substation under the precondition of ensuring the impact strength of the composite surface wall plates.

The invention discloses a method for preparing automobile damping plastic. The method comprises the following steps: mixing polycarbonate, an acrylonitrile-butadiene-styrene copolymer, polystyrene, a calcium carbonate complex, sepiolite powder, lanthanum oxide, kieselguhr and fumed silica to obtain a first material; putting epoxy soybean oil, disproportionated rosin, vinyl tri(beta-methoxyethyoxyl)silane, an antioxidant 168, an anti-aging agent DFC-34, stearic acid and acetic anhydride into the first material, mixing, heating, degumming, leaving to stand at the room temperature, further adding tert-butyl hydroperoxide and dibutyltin dilaurate, performing heating stirring, extruding, performing injection molding, and cooling, thereby obtaining the automobile damping plastic. The automobile damping plastic prepared with the method is very excellent in damping property and very high in impact resistance, the impact strength and the toughness under a high-temperature condition can be ensured, and the damping problem of a material can be remarkably improved.

The invention discloses medium-anti-impact polystyrene resin and a preparation method thereof. The resin is prepared from the following raw material ingredients in percentage by weight: 85 to 96 percent of styrene monomers, 1 to 6.5 percent of mixed rubber, 1 to 8 percent of flowing modifying agents and 1.5 to 7 percent of superfine powder, wherein the mixed rubber is prepared from two or three kinds of rubber in rubber with the solution viscosity being 140 to 190 cps, rubber with the solution viscosity being 70 to 100 cps and rubber with the solution viscosity being 20 to 50 cps. A polymerization method is used for replacing a mixing method to obtain the medium-anti-impact polystyrene resin; the cooperated effect of a PS body, rubber and ultrafine powder body is sufficiently achieved; onthe premise of ensuring the intensity, the consumption of the toughening agent rubber is possibly reduced, so that the intensity, the rigidity, the flowing performance and the luster degree of the product can be properly improved; the requirements of users on the medium-anti-impact product can be met; the mass production is easy.

A polymer composition includes a rubber-modified aromatic vinyl resin and a cyclic phosphonate ester compound. Embodiments of the composition demonstrate good impact strength, flame retardancy, heat resistance. Some embodiments additionally demonstrate moisture resistance and low heat sag. A shaped article and an electronic device can be made from the flame retardant polymer composition.

The invention provides a transparent and toughening polylactic acid resin and method for preparing the same. The polylactic acid resin consists of polylactic acid, methyl methacrylate-butyl acrylate copolymer as the flexibilizer, citrate plasticizer, pentaerythritol toltetranitrate (Benzenepropanoic acid, 3,5-bis(1,1-dimethylethyl)-4-hydroxy-) as the antioxidant and tris (2,4-ditert-butylphenyl) phosphate. First, premix is prepared by mixing polylactic acid, flexibilizer, plasticizer and antioxidant mechanically. Then the premix is subject to melt extrusion and granulation by utilizing double-screw extruder. The above method has the advantages of increasing the anti-impact strength, tensile strength and elongation at break of polylactic acid and maintaining the transparency thereof. In addition, the viscosity of the blends is decreased, thereby remedying the defects of brittleness of polylactic acid and improving the rheological behavior of materials obviously. The impact strength is up to 60.1KJ / M2. The light transmittance and the haze of the products are 89% and 8.5% respectively when the thickness thereof is 0.04mm. The above polylactic acid resin, instead of PE and PVC, is applicable to the preparation of films, plates, sheet materials, foamings and injection moulding plastics.

The invention discloses a high-frequency electromagnetic induction straight hot press heating plate. The high-frequency electromagnetic induction straight hot press heating plate comprises a steel plate and a high-temperature electromagnetic wire; a row of wire holes penetrating through the steel plate are formed in the positions, parallel to the upper surface and the lower surface, of the middleof the steel plate and are distributed at equal intervals, and the distance between centers of every two adjacent wire holes is 5-10 cm; when the distance between centers of every two adjacent wire holes is 5-8 cm, the high-temperature electromagnetic wire is threaded through the wire hole according to the principle that the current direction of every two adjacent holes is consistent as much as possible, and the two ends of the high-temperature electromagnetic wire are connected with a high-frequency heating power source and a controller. According to the high-frequency electromagnetic induction straight hot press heating plate, through the wire hole forming mode, the self structure of the steel plate is not changed as much as possible, and it is ensured that the mechanical property of thesteel plate is not changed; and meanwhile, it can be ensured that electromagnetic energy is absorbed by the steel plate sufficiently and converted into heat energy, the whole steel plate is uniform in heating, and an existing flat hot pressing plate is transformed advantageously.

The invention belongs to the technical field of conveying belts, and particularly relates to an antistatic TPU belt. The antistatic TPU belt comprises a fabric inner core and a covering rubber layer.;the fabric inner core is composed of warp yarns and weft yarns, and the warp yarns and the weft yarns are woven up and down according to a plain weaving method; the warp yarns are composed of polyester or cotton fiber or aramid fiber and polyamide fiber; and the weft yarns are composed of nylon-based conductive fiber, hollow glass fiber and polypropylene fiber. According to the invention, the fabric inner core is improved, the wear resistance and the strength of the conveying belt are guaranteed by the warp yarns, antistatic property of the conveying belt and high temperature resistance of the conveying belt are improved by the weft yarns; antistatic principles of the fabric inner core are that corona discharge is caused by an electric field to neutralize static electricity, so that an antistatic effect is achieved, and antistatic effect is good. By improving the covering rubber layer, the adding amount of wear-resistant conductive carbon black is reduced, and meanwhile, a certain amount of PVC resin is added, so that the tensile strength and the impact strength of the covering rubber layer are ensured.

The invention discloses a highway pavement construction method, which comprises the following steps of primarily pressing a roadbed by adopting a vibrating road roller, then finishing repair of the roadbed, and eliminating all crushed matters, bulges and hollowing matters; laying self-made limestone soil on the roadbed to form a pavement bedding; spreading aggregates on the bedding layers by layers by adopting a crushed stone spreader according to a preset width and a preset thickness, fully rolling a laid crushed stone layer by adopting rolling equipment, performing leveling after rolling byadopting a land leveling machine, and uniformly spreading steel fiber reinforced self-compacting cement on the crushed stone layer according to a preset dosage by adopting a powder spreading vehicle;performing mixing to form a pavement base course by adopting a cold recycling machine; and constructing a seal course on the pavement base course, and then laying a pavement surface course. The highway pavement construction method is short in construction period, reduces pollution to environment while reducing the manpower and ensures the loading strength, the fatigue resistance, the compressive strength, the impact strength and the stability of a pavement.

The invention belongs to the technical field of processing of a macromolecular material and particularly relates to a chemical solvent-resistant conduction type PC / ABS composite material. The chemicalsolvent-resistant conduction type PC / ABS composite material comprises the following raw materials in parts by weight: 60 to 65 parts of PC resin, 28 to 34 parts of ABS resin, 16 to 20 parts of modified o-cresol formaldehyde epoxy resin, 2.6 to 3.2 parts of barium titanate ceramic powder, 0.8 to 1.6 parts of imide salt, 0.6 to 0.8 part of antioxidant, 0.1 to 0.3 part of initiator and 0.1 to 0.3 part of zinc stearate. Compared with the prior art, the chemical solvent-resistant conduction type PC / ABS composite material has the following advantages: the prepared composite material has high conductivity; the modified o-cresol formaldehyde epoxy resin can effectively improve the chemical solvent resistance and the high-temperature resistance of the composite resin; and the o-cresol formaldehydeepoxy resin with specific properties is modified by using C5 petroleum resin, so that the processing property of the composite material is improved, the impact strength and the ageing resistance of the composite material can be guaranteed and the service life of the material is prolonged.

The invention discloses a preparation method for a plastic base of a refrigerator. The preparation method comprises the following steps: heating and plasticizing polycarbonate, an ethylene-vinyl acetate copolymer and an acrylonitrile-butadiene-styrene copolymer so as to obtain a first material; adding disproportionated rosin and polyethylene wax into the first material, carrying out plasticization, adding diatomite, talcum powder, aluminum hydroxide, calcium sulfate whiskers, a silane coupling agent, carbon fibers, acetic anhydride, stearyl alcohol, 1,1-bis-(tert-amylperoxy)cyclohexane and an accelerator TMTM and carrying out plasticization so as to obtain a second material; and subjecting the second material to heating and plasticizing, thin-passing, and sheet production successively so as to obtain the plastic base of the refrigerator. The plastic base of the refrigerator prepared in the invention has good resistance to permanent compression deformation, good toughness and excellent resistance to impact and tearing, reduces the damage of the refrigerator to floors, and can ensure safe use of the refrigerator for at least 20 years.

The invention discloses a 3D full-curved-surface refrigerator door body and a manufacturing technology thereof, and relates to the technical field of refrigerator door bodies. The refrigerator door body sequentially comprises a door lining, a polyurethane foaming layer, a door shell support frame and a composite door shell from inside to outside, the position between the door lining and the door shell support frame is filled with a polyurethane foaming layer, door decoration strips are fixed to the upper end and the lower end of the door lining, two sides of the door decoration strips are connected with the door lining and the door shell support frame, the composite door shell is formed through hot bending of a composite base plate, the composite base body sequentially comprises a PET protection film, a hardened oleophobic lyophobic coating, a PMMA layer, a PC layer and a PC printing layer from outside to inside, and the PMMA layer and the PC layer make a PMMA / PC composite board to beused through a composite co-extrusion device, after the PMMA layer is hardened, the pencil hardness above 4H can be achieved, product scratch-prevention properties are ensured, the PC layer can ensureenough toughness, the whole impact strength is ensured, and the composite door shell is uniform in wall thicknesses, easy to punch, high in hardness, high wear resistance and easy to form.

The invention relates to the technical field of a high-molecular thermal-conductive composite material, particularly to a high-filling-amount PA6 / MgO thermal-conductive composite material and a preparation method thereof. The PA6 / MgO thermal-conductive composite material includes the following raw materials, according to a mass percentage ratio, 30-60 parts of PA6 resin, 40-70 parts of a thermal-conductive filling material, 0.5-1.5 parts of a silicane coupling agent, and 0.4-1.2 parts of an anti-oxidant. The composite material is high in thermal-conductive coefficient and excellent in mechanical properties, and MgO acted as the filling material is uniformly dispersed in the PA6 substrate. The preparation method is simple in process, mature in technology and low in cost, allows high-thermal-conductive-coefficient engineering plastics to be prepared to meet different production requirements, and therefore is beneficial for popularization and application.

The invention relates to a vacuum autoclave used for motorcycle helmet production and a motorcycle helmet forming process. The vacuum autoclave comprises an autoclave body and a forming device. The forming device comprises a vacuum bag, a forming mould arranged in the vacuum bag, and a connector connected to the vacuum bag and communicating with the forming mould. One end of the autoclave body isfixedly connected with a closed component. A heating device is arranged in the closed component. The other end of the autoclave body is connected with an autoclave door. The autoclave body is connected with a vacuumizing device used for communicating with the connector. A gas exhausting device and a gas inlet pipe are arranged on the outer wall of the autoclave body in the length direction of theautoclave body in sequence. The gas inlet pipe communicates with a gas inlet device. By means of the vacuum autoclave used for motorcycle helmet production and the motorcycle helmet forming process, the impact strength of a motorcycle helmet is effectively improved, the product quality is improved, and the problem that the impact strength of a motorcycle helmet is low is solved.

The invention discloses a modified polypropylene masterbatch and a composite polypropylene material utilizing the same. The modified polypropylene masterbatch comprises, by weight, 100 parts of chlorinated polypropylene, 5-30 parts of organic amine, 10-20 parts of synergist, 0.5-2 parts of antioxygen, and 0.4-1.2 parts of stabilizing agent. The composite polypropylene material utilizing modified polypropylene masterbatch comprises, by weight, 10-20 parts of the modified polypropylene masterbatches, 10-20 parts of chlorinated polyolefin, and 60-80 parts of polypropylene. The modified polypropylene masterbatch comprises the organic amine modified chlorinated polypropylene as macromolecular antistatic agent, and is durable in antistatic effect. As for the composite polypropylene material utilizing the modified polypropylene masterbatch, when shock strength of polypropylene materials is guaranteed, antistatic property and flame retardance property are improved.