444 results about "Engineering plastic" patented technology

The invention belongs to the technical field of crossing of high polymer materials and artificial intelligence, and discloses a method for optimizing the proportion of a nano-composite flame-retardant master batch in engineering plastic based on machine learning. The method is used for solving the problems that a traditional experience trial and error method is low in efficiency in multi-target performance collaborative optimization, high-dimensional nonlinear parameter space search is difficult, and microscopic coupling effect modeling is missing. According to the method, a multi-dimensional input feature set containing material composition and process parameters is constructed, six key performance indexes are combined to form training data, a mixed model formed by cascading a multi-layer perceptron and Gaussian process regression is trained, an improved non-dominated sorting genetic algorithm (NSGA-II) is adopted for multi-target global optimization, and an optimal ratio meeting preset constraints is obtained. The method is an industrial internet technology system service, and solves the technical problem that multi-target performance is difficult to collaboratively optimize due to the fact that a traditional experience trial-and-error method cannot perform modeling and searching on a high-dimensional nonlinear parameter space of a nano-composite flame-retardant system.

The invention provides a modified engineering plastic melt index real-time monitoring method which comprises the following steps: determining a melt index difference value of adjacent monitoring points by acquiring a melt index value of each section of an extrusion production line; obtaining the number of shearing cycles of the extrusion production line, identifying the fiber shearing damage degree of each section according to the melt index difference and the number of shearing cycles to obtain fiber damage distribution, and determining the fiber fracture position according to the fiber damage distribution; the melt index difference value corresponding to the fiber fracture position is analyzed by obtaining the melt index of the fiber fracture position, and the monitoring point interval is dynamically adjusted through the melt index difference value; and obtaining the melt index value and the fiber shortening amplitude after the interval adjustment of the monitoring points, and comparing the melt index change and the fiber length loss of each monitoring point to obtain the corresponding distribution of the fiber shortening amplitude and the melt index value.

The invention relates to a quick connector and a production mold thereof, and relates to the technical field of mechanical engineering, and the quick connector comprises a first pipeline, a second pipeline and a connecting shell made of an engineering plastic material. The corrosion resistance is improved through the connecting shell made of the engineering plastic, the connecting shell is made of the engineering plastic, a metal hoop in the prior art is replaced, and the problem of metal corrosion is solved from the material level. The hoop directly wraps the connecting end of a pipeline, does not need to be exposed to the external environment, can resist erosion of water vapor and corrosive media for a long time, ensures the stability of a connecting structure, and solves the problems of clamping force attenuation and leakage hidden danger caused by corrosion of a traditional metal hoop. Tool-free rapid operation is achieved through the limiting mechanism, and through the synergistic effect of a limiting sliding rod, a first spring and a first ball, when the connecting shell is pulled upwards, constraint of an annular limiting hole to the first ball is relieved, the first spring rebounds to drive the limiting sliding rod to be away from the second pipeline, and pipeline insertion is facilitated.

The invention belongs to the field of high polymer material synthesis, and provides a method for preparing polyphenylene sulfide from high-purity p-dichlorobenzene, which adopts the whole process design of pre-construction of a composite sulfur source intermediate, regulation and control of an end group controllable oligomerization polyphenylene sulfide intermediate, segmented polymerization of the high-purity p-dichlorobenzene and precise dehydration-washing-drying. The ultra-low impurity level of 0.05-0.25 wt% of burning residues of the polyphenylene sulfide product, the sodium ion content of 10-200 mg / kg and the chloride ion content of 10-500 mg / kg is achieved, and meanwhile the high-performance stability of the melting point of 270-300 DEG C, the gel fraction of 92-99 wt% and the water content of 0.01-0.20 wt% is kept. The problems of deep removal of inorganic ions and ash content, balance of gel fraction and processability and control of residual solvents in the traditional polyphenylene sulfide preparation process are solved, and the method has wide application value in the fields of high-performance engineering plastics, special fibers, electronic packaging materials and the like.

The invention discloses a hydrolysis-resistant PBT reinforced material capable of being subjected to laser welding and a preparation method of the hydrolysis-resistant PBT reinforced material, and belongs to the field of engineering plastics. Comprising the following raw materials in parts by mass: 45-70 parts of PBT resin, 0.5-1 part of a nucleating agent, 0.5-1 part of a nucleating auxiliary agent, 0.1-1 part of an antioxidant, 0.1-1 part of a lubricant, 0.2-0.8 part of a hydrolysis-resistant agent, 1-3 parts of a toughening agent and 25-45 parts of glass fibers, the nucleating auxiliary agent is sodium-doped potassium aluminosilicate. The nucleating agent can improve the crystallization rate of PBT, refine the grain size and reduce light scattering, and the hydrolysis-resistant agent can block autocatalytic hydrolysis circulation. And the composite sodium-doped potassium aluminosilicate not only can provide a large number of sites for PBT nucleation, but also can adsorb and capture water molecules in the environment and small molecules in an adsorption material and reduce hydrolysis reaction, so that the reinforced PBT material can be suitable for laser welding, and the long-term stability of the material in a high-temperature and humid environment can be guaranteed.

The reclosing circuit breaker comprises an electric operation mechanism and an operation mechanism, the electric operation mechanism is provided with an output gear and a connecting rod, one end of the connecting rod is connected with the output gear, and the connection position deviates from the rotation center of the output gear; wherein the operating mechanism comprises a handle, and the handle is made of engineering plastics; a driving column and a limiting part are integrally formed on the handle through injection molding; a linkage hole is formed in the other end of the connecting rod, the driving column is sleeved with the linkage hole, and along with rotation of the electrolytic bath mechanism, the connecting rod acts on the driving column through the hole wall of the linkage hole so as to drive the operating mechanism; the limiting part is positioned above the driving column so as to prevent the driving hole from being separated from matching with the driving column; the handle has the advantage that the handle is not prone to being broken down.

The invention provides self-made small five-axis numerical control machine tool teaching equipment and an operation method thereof, and relates to the technical field of numerical control machining teaching equipment. A main shaft system and a clamp are arranged on the five-axis movement system; a transparent safety protection cover is arranged on the peripheral side of the five-axis movement system in a covering manner; a plurality of cameras are arranged on the five-axis movement system or the safety protection cover; the control system is respectively connected with the plurality of cameras, the main shaft system, the clamp and the five-axis movement system; according to the invention, an open modular structure is adopted, key moving parts and a processing process are completely exposed or visible through the transparent protective cover, so that a teacher can explain step by step and observe at a short distance with students; the machine tool body is made of light-weight materials such as aluminum alloy or engineering plastics, an open source numerical control system and standardized electromechanical components are combined, and on the premise that the basic teaching function is guaranteed, the manufacturing cost and maintenance complexity of equipment are greatly reduced.

Disclosed is a heater assembly for accommodating and heating an aerosol generating article, the heater assembly including: an accommodation portion configured to accommodate an end portion of an aerosol generating article; a heating portion arranged to surround another portion of the aerosol generating article; and a combining portion configured to combine the accommodation portion and the heating portion and including engineering plastic, wherein the accommodation portion, the combining portion, and the heating portion are arranged along a longitudinal direction of the aerosol generating article and form an accommodation space in which the aerosol generating article is accommodated.

This invention discloses a high-transmittance ethylene copolymer and its applications. In this copolymer, the molar content of the second olefin X is 1.8-9.9 mol%, and the second olefin X is an olefin with more than 4 carbon atoms and an odd number of carbon atoms. The molar content of the [EXX] segment is 0.1-5.0 mol% of the total ternary segment content, the molar content of the [EEE] segment is 70-90 mol%, the molar content of the [EXE] segment is 2.0-8.0 mol%, the molar content of the [XEE] segment is 0.5-3.0 mol%, and the molar content of the [XEX] segment is 3.5-10.0 mol%. In this copolymer, when the molar content of the [EXX] segment reaches 0.15 mol%, the transmittance of the copolymer film after hot pressing is not less than 90%, exhibiting extremely high atom economy of the second olefin X. This copolymer can be applied in photovoltaic films, toughening of polyolefin materials, wire and cable, and modification of engineering plastics.

The invention relates to the technical field of polymer composite material preparation, in particular to a super-tough core-shell stereocomplex polylactic acid-based composite material and a preparation method thereof. The super-tough core-shell stereocomplex polylactic acid-based composite material is prepared from the following raw materials in parts by mass: 70 to 100 parts of polylactic acid and 0 to 30 parts of the modified elastomer in claim 4, and the dosage of the modified elastomer is not 0; the modified elastomer is prepared by melting and blending stereocomplex polylactic acid powder and a functional elastomer copolymer; the stereocomplex polylactic acid powder is prepared by reactive melt blending of PLLA and PDLA in an equal mass ratio or an equal molar ratio. The prepared super-tough core-shell stereocomplex polylactic acid-based composite material has excellent tensile strength and impact resistance, can be applied to the field of engineering plastics such as automobile parts, electronic and electric appliance shells, household products, catering tableware and the like, and has remarkable environmental protection benefits and industrial popularization value.

The invention discloses a thermoplastic engineering plastic and a preparation method thereof, and the thermoplastic engineering plastic comprises the following components by weight: 83-93% of ABS resin, 3-10% of flake alumina and 3-4% of a processing aid; wherein the surface of the flaky aluminum oxide is connected with a lipophilic group. According to the invention, the surface-modified flaky aluminum oxide is adopted as a functional filler and is compounded with the ABS resin to prepare the ABS thermoplastic engineering plastic, and the flaky aluminum oxide can realize single-sheet stripping after being subjected to surface treatment, so that the characteristics of portability, impact resistance, weather resistance and great improvement of dimensional stability can be achieved only by using 3-10% of additive amount; meanwhile, the production cost of the ABS plastic and the increase amplitude of the overall weight are reduced due to the low filler addition amount, and no obvious adverse effect is generated on the mechanical property of the plastic; the preparation method does not need to change the forming processing technology of the existing ABS plastic, the production cost is low, and the product can be recycled.

The utility model discloses an engineering plastic molecular chain double-bond stabilizing device, and relates to the technical field of plastic double-bond stabilization, the engineering plastic molecular chain double-bond stabilizing device comprises a support frame, the top surface of the support frame is provided with a transmission case, one end of the transmission case is provided with an extrusion screw rod, and the other end of the transmission case is provided with a screw rod; an electromagnetic heater is arranged on the surface of the outer side of the extrusion screw rod, a pretreatment assembly is arranged on the upper portion of the extrusion screw rod and comprises a supporting frame and a hollow sleeve, a feeding port is formed in the inner wall of the supporting frame, a stirring tank is installed on the top face of the feeding port, and stirring blades are rotationally connected to the inner wall of the stirring tank; a double-bond material pipe and a plastic particle pipe are mounted on the top surface of the stirring tank. Through the synergistic effect of the spiral heating oil cavity in the stirring tank and the stirring blades, double-bond materials and plastic particles are pre-reacted under heating of the hollow sleeve, and the double-bond breakage risk in the subsequent high-temperature hot melting stage is reduced.

The utility model relates to high polymer material processing equipment technical field, concretely relates to a kind of efficient mixing device of halogen-free engineering plastics carbon black, including double-screw extruder main body and the die head of being installed in the output end of double-screw extruder main body, channel is opened in die head and is communicated with the extrusion cavity of double-screw extruder main body, the top and bottom of die head are all penetrated channel and are equipped with jack, two jacks are jointly inserted with the mounting plate that can slide up and down, several square holes that are equally spaced distribution are penetrated and equipped on the mounting plate, several square holes are all detachably installed with filter screen, several filter screens are all vertical and filled with entire flow channel, by lifting electric cylinder drive mounting plate up and down sliding, different filter screen can be switched in non-stop state, avoid the cumbersome operation of traditional screen change and need to stop die head disassembly, improve production efficiency, multiple square filter screens are vertically arranged, increase filtration area, extend jamming time, suitable for high-filled carbon black formula.

The invention discloses a 3D printer with a printing space located in a drying oven cavity, and belongs to the technical field of 3D printing. According to the 3D printer, a printing device is installed on a horizontal driving device, a printing platform is installed on a vertical driving device, a printing space is formed in a drying oven, the printing platform is arranged in the printing space, the drying oven is used for adjusting the environment temperature in the printing space, and a horizontal organ cover and a feeding module are installed on the horizontal driving device. The horizontal organ cover is arranged between the printing space and the horizontal driving device, the feeding module is arranged above the organ cover, the vertical organ cover is installed on the vertical driving device, and the vertical organ cover is arranged between the printing space and the vertical driving device. The printing space of the 3D printer can be arranged in the drying oven cavity, so that the environment temperature of the printing space is adjustable, and the key requirements of the current high-performance engineering plastic 3D printing problem are met.

The invention relates to the technical field of polycarbonate resin, in particular to a polycarbonate-polysiloxane copolymer as well as a preparation method and application thereof. The polycarbonate composition comprises a polycarbonate block and a polyorganosiloxane-containing block, the polyorganosiloxane-containing block comprises a repeated structural unit as shown in a general formula (I), and the polycarbonate block comprises a repeated structural unit as shown in a general formula (II); in the structural unit as shown in the general formula (I), R1-R4 are respectively and independently selected from halogen atoms, alkyl groups of C1-C6 and aryl groups of C6-C14; n is an integer from 40 to 100; the polycarbonate-polysiloxane copolymer material provided by the invention has the advantages of high molecular weight, good heat resistance and excellent mechanical properties, and meets the application requirements of the polycarbonate-polysiloxane copolymer material as engineering plastic in high-temperature and low-temperature environments.

The invention particularly relates to an additive blending device for special engineering plastics, and relates to the technical field of mixing and stirring equipment.The additive blending device comprises a barrel and a mounting frame arranged at the top of the barrel, a polygonal rotating pipe is rotationally mounted in the barrel, and the polygonal rotating pipe can drive a stirring frame to rotate forwards and backwards in a reciprocating mode to achieve mixing and stirring of an additive; then a transmission mechanism is matched to drive an upper bracket and a lower bracket which synchronously ascend and descend up and down to push the rotating stirring frame to reciprocate up and down, so that the mixing range of the stirring frame to different heights is widened; meanwhile, the polygonal rotating pipe is matched with rotation of the transmission mechanism during forward and reverse rotation, and lifting of the lifting screw rod can be controlled in a transmission mode, so that the lifting screw rod pulls the piston to reciprocate up and down in the polygonal cavity, liquid at the bottom in the barrel body is pumped into the polygonal cavity to be mixed, and the liquid can be pressurized again and rapidly conveyed into the barrel body; the mixing collision effect and efficiency of liquid materials in the barrel are improved.

This invention discloses a polyetheretherketone (PEEK) / aramid fiber composite microporous material and its molding method, belonging to the field of engineering plastics processing. The invention first modifies aramid fibers by amylation and prepares carboxylated PEEK. Covalent bonding between the amino and carboxyl groups is achieved through a chemical reaction, resulting in aramid fibers coated with PEEK. These fibers are then mixed with PEEK resin, a melt flow modifier, and additives to obtain a composite material. The composite material is then subjected to biaxial thermo-stretching orientation to improve its transverse / longitudinal orientation and crystallinity. Finally, the composite microporous material is obtained through supercritical CO2 microporous foaming. Because the foaming temperature is lower than the thermo-stretching orientation temperature, the biaxial orientation structure of the composite material is well preserved, and the well-dispersed aramid fibers effectively improve the cell wall strength, inhibit cell growth and merging, significantly increase cell density, and drastically reduce cell size, thereby constructing a high-strength, heat-insulating PEEK composite microporous material.

The application discloses a kind of superdispersion flame-retardant engineering plastic master batch and preparation method thereof, it is related to functional plastic technical field, including functional master batch, the functional master batch includes the following components by weight parts: nylon 6 sheet 100 parts, modified carbon nanotube 0.5-8 parts, diethyl phosphinic acid ethyl aluminum 5-15 parts, flame retardant 5-15 parts, carbon forming agent 2-5 parts, epoxy silicon dioxide 0.5-5 parts, compatible agent 0.5-5 parts.The application introduces diethyl phosphinic acid ethyl aluminum and flame retardant, forms carbon layer on the material surface when plastic master batch burns, and the interaction between the molecular chains of plastic master batch is improved by Schiff base structure, realizes the double performance improvement of plastic master batch flame retardant and anti-dripping, solves the problem of fire spread caused by melt dripping.

The utility model belongs to the technical field of installation and protection of outdoor electronic equipment, and relates to a metal transportable vibration reduction box formed by bending and welding sectional materials. The defects that an engineering plastic box material is poor in secondary processability, low in size precision and poor in weather resistance, and a common metal transportable box is large in machining difficulty, long in machining period, high in cost, poor in stacking and carrying performance and the like are overcome. Box covers are respectively arranged on the left and right sides of the box body; the box cover comprises a box cover frame, a cover plate is mounted in the box cover frame, the box cover frame is integrally formed by bending and welding an aluminum alloy section I, four grooves I for bending are formed in the aluminum alloy section I, and a groove is formed in the top surface of the aluminum alloy section I; the box body comprises an open type cover plate, a lower bottom plate is arranged at a lower opening of the open type cover plate, box body frames are arranged at a left opening and a right opening of the open type cover plate respectively, the box body frames are integrally formed by bending and welding aluminum alloy sections II, four grooves II used for bending are formed in the aluminum alloy sections II, and a boss is arranged on the top face of the aluminum alloy sections II.

The application relates to the technical field of high polymer composite materials, and discloses a light-weight heat-conducting engineering plastic and a preparation method thereof, which is prepared through melt blending of a polyamide resin matrix, boron-nitrogen alkane-polydimethylsiloxane hybrid polymer and a heat-conducting filler composed of a core-shell structure of graphene-liquid metal and composite ceramic microspheres with in-situ grown aluminum oxide nanowires on the surface. First, an interface compatibilizer is synthesized through nucleophilic substitution polycondensation; then, the core-shell structure filler is prepared through a mechanical chemical method, and the nanowires are in-situ grown on the surface of the microspheres through polydopamine biomimetic modification and a hydrothermal-calcination method to construct a three-dimensional heat-conducting network; finally, the light-weight heat-conducting engineering plastic is obtained through melt blending, uniform dispersion and strong interface combination of all components are realized, the engineering plastic with the characteristics of high heat-conducting coefficient, high notched impact strength and low density is obtained, and an innovative material solution is provided for fields with strict requirements on light weight and heat conduction.

The utility model belongs to the technical field of automobile parts, more specifically, it relates to a car tail door structure. Including tail door inner plate (1), tail door outer plate (2), tail door inner plate (1) is engineering plastics inner plate, tail door outer plate (2) is engineering plastics outer plate, the inner surface of tail door inner plate (1) is provided with reinforced rib part (3), and the reinforced rib part (3) includes multiple reinforcing ribs (4), the inner surface of tail door outer plate (2) is provided with reinforced rib part (3), and the reinforced rib part (3) includes multiple reinforcing ribs (4), and tail door inner plate (1) and tail door outer plate (2) fixed connection. The car tail door structure of the utility model, simple structure, both realize lightweight design, and have good strength.

The utility model belongs to the technical field of shielding cabinets, particularly relates to a portable shielding cabinet made of lightweight composite materials, and aims to solve the problems that a main body structure of an existing device is integrally made of metal materials, and although the metal materials have excellent electromagnetic shielding performance, the self weight of the metal materials is large, so that in a scene needing frequent movement or temporary construction, the electromagnetic shielding performance of the metal materials is poor. In order to solve the problems that a traditional shielding cabinet is extremely inconvenient to carry and consumes a large amount of manpower and material resources, the utility model provides the following scheme that the portable shielding cabinet made of the lightweight composite material comprises a frame main body which adopts a frame type structure; the utility model has the beneficial effects that the frame main body is formed by splicing high-strength aluminum alloy sections, the density is low, the weight is light, the frame type structure is matched, the frame is stable, the portability is obviously improved, the carrying is easy and labor-saving, the corner connecting pieces are made of high-strength engineering plastics, the weight is reduced, electromagnetic conduction is prevented, and the shielding performance is optimized.

This invention relates to a special engineering plastic polyethersulfone microporous foam material and its preparation method, belonging to the field of polymer foaming technology. It solves the problem in existing technologies where high foaming ratio, microporous structure, and excellent mechanical properties cannot be simultaneously achieved when using injection molding technology for macromolecular polyethersulfone materials. The method of this invention includes the following steps: Step 1: Raw material pretreatment; Step 2: Melt blending: Mixing PES substrate, second component, functional filler, crosslinking agent, and cell stabilizer, followed by melt blending, granulation, and drying to obtain granules; Step 3: Injection molding: Injecting the granules into an injection molding machine, adding a composite foaming agent to the injection molding machine, mixing, and injection molding to obtain an injection-molded foam material; Step 4: Curing: Irradiating the injection-molded foam material with X-rays to obtain the special engineering plastic PES microporous foam material.

The invention relates to a preparation method of high molecular weight nylon 66 resin, which comprises the following steps: dispersing a catalyst, a stabilizer and an optional lubricant in molten hexamethylenediamine, and then adding the mixture into adipic acid powder or melt stirred in a reaction kettle for mixing; stirring reactants in a reaction kettle for 90 to 600 minutes at the temperature of 145 to 195 DEG C and the pressure of 1 to 10 MPa under the protection of inert gas; the reaction kettle is deflated to a normal pressure state within 30-150 min; vacuumizing the reaction kettle to the pressure of 0.01-0.5 MPa, and then carrying out solid-phase polymerization for 0-300 minutes; and naturally cooling to room temperature, and taking the material to obtain the nylon 66 polymer. According to the invention, decomposition of nylon 66 salt is inhibited by utilizing solid-phase polymerization, adding an auxiliary agent or supplementing pressure, and volatilization of hexamethylenediamine is effectively prevented; the phosphorus compound and the silicon compound are added as stabilizers to improve the thermal stability of the nylon 66 and delay the generation of gel. The nylon 66 product prepared by the invention is high in purity, good in thermal stability and oxidation resistance and good in processability, and is suitable for the fields of civil filaments and engineering plastics.

The application discloses a PC / ABS alloy and a preparation method and application thereof, and belongs to the technical field of high polymer engineering plastics; the PC / ABS alloy provided by the application comprises the following components in parts by mass: 63-78 parts of PC, 8-22 parts of ABS, 5-13 parts of titanium white, 1-6 parts of bisphenol A-bis(diphenyl phosphate), 0.5-5.5 parts of indium tin oxide, 0.1-1.2 parts of carbon black and 0-8 parts of an auxiliary agent; the average particle size of the titanium white is 140-310 nm; and the average particle size of the carbon black is less than or equal to 22 nm. The product prepared by the application has excellent light-shielding high-reflecting white effect and good appearance, and excellent laser welding performance; thereby, the product can be widely applied to the preparation of paint-sprayed parts of automobile interiors and exteriors. Moreover, the preparation method of the PC / ABS alloy is simple in operation and is beneficial to actual production.

The present invention relates to a monomer having a functional group, a heat-resistant polymer having a rigid main chain using same, and a manufacturing method therefor. Particularly, the present invention relates to a monomer having a pentafluorophenyl group of chemical formula 1, a heat-resistant polymer of chemical formulas 2 and 3 having the monomer of the present invention, and a manufacturing method therefor. According to the present invention, a novel polymer obtained by polymerizing a novel monomer of the present invention has a reactive group of reactive pentafluorophenyl, and thus may exhibit excellent reactivity and enable synthesis of polymers having an excellent polymerization degree by using a polyhydroxyalkylation polymerization method without a protective group. Due to such excellent reactivity, the polymer of the present invention can cause a nucleophilic substitution reaction under mild conditions, and thus an ion-exchange group, such as sulfonic acid or phosphonic acid, can be introduced under mild conditions through such a reaction. In addition, the novel polymer of the present invention has high heat resistance and chemical resistance and good tensile strength, and thus can be used as an engineering plastic. In addition, the novel polymer of the present invention can be imparted with ionic conductivity or other functionalities by introducing a phosphonic acid group or a sulfonic acid group into any one of fluoro positions of pentafluorophenyl of the polymer, and accordingly, may be used as an electrolyte membrane for a fuel cell or water electrolysis. [Chemical formula 1] [Chemical formula 2] [Chemical formula 3]

The utility model belongs to the technical field of pipe roundness correction, disclose a kind of appearance roundness correction equipment for engineering plastic pipe processing, including support platform, the first positioning frame is fixed in support platform left side upper end, first positioning frame both sides install first positioning roller, the transmission roller is installed in the first positioning frame lower end, first positioning frame upper end is provided with positioning frame, and positioning frame lower end is connected second positioning roller, the second positioning frame is fixed in support platform upper end, second positioning frame upper end is fixed heating pipe, and heating pipe inner wall installs heating wire, the third positioning frame is fixed in support platform right side upper end.This appearance roundness correction equipment for engineering plastic pipe processing is positioned to pipe by setting transmission feeding structure, and realizes uniform feeding, and cooperate rotary roundness correction structure, can be after heating to pipe, by multiple groups of rotating roundness correction roller to pipe roundness correction processing, and cooperate cooling structure, realize complete roundness correction procedure, realize continuity operation.

The application discloses a kind of self-reinforced nylon materials and preparation method thereof, and the self-reinforced nylon material contains the benzocyclobutane structure sensitive to force.By interface polycondensation method, the benzocyclobutane structure is introduced into nylon main chain.When the matrix material is subjected to destructive force, the benzocyclobutane structure unit undergoes ring-opening isomerization, and simultaneously reacts with the bifunctional group crosslinking agent in the matrix material, plays the crosslinking self-reinforcing role.The technical route of the application is simple, the required cost is low, and the prepared nylon material can be used in some engineering plastic application fields with harsh service conditions, and can reduce the risk of component failure.

To provide a polyolefin copolymer that is used as a modifier for engineering plastic to yield an engineering plastic composition with low dielectric constants and low dielectric loss tangents.SOLUTION: A polyolefin copolymer has a main chain containing a monomer unit A derived from a C2-8 olefin monomer and a monomer unit B having a glycidyl group. The main chain may also contain a monomer unit C derived from a (meth)acrylic acid ester or vinyl ether. Based on the mass of the olefin copolymer, the proportion of the monomer unit A is 94 mass% or more and the total proportion of the monomer unit B and the monomer unit C is less than 6 mass%.SELECTED DRAWING: None

The invention discloses a power distribution chassis of a circuit breaker, which belongs to the technical field of power distribution equipment and comprises a base and an upper cover. The base and the upper cover are made of high-insulativity engineering plastics through an integral injection molding process; a first elastic clamping pin is arranged on the base, and an elastic clamping pin inserting groove and an elastic clamping pin supporting wall which are matched with the first elastic clamping pin are arranged on the upper cover; the first elastic clamping pin penetrates through the elastic clamping pin inserting groove of the upper cover and is clamped on the elastic clamping pin supporting wall of the upper cover, and the first elastic clamping pin is used for fixing the base and the upper cover of the distribution board; the scheme is composed of the plastic base, the upper cover, the independent electrical connecting plate, the fastening nut and the like, the structure is simple, and combination and installation are convenient; and the plastic base and the upper cover ensure the safety of electrical installation.