29 results about "Nylon 66" patented technology

The application discloses an anti-deformation crown-shaped cage of a super-speed motor bearing and a manufacturing method, and belongs to the technical field of motor bearings. The anti-deformation crown-shaped cage of the super-speed motor bearing is printed by a functionally graded material, the functionally graded material comprises hard-phase material and soft-phase material, the hard-phase material is glass fiber, and the soft-phase material is nylon 66; the equivalent elastic modulus of the functionally graded material continuously and gradually changes along the axial direction from the bottom of the pocket hole to the end of the locking claw, so that the elastic modulus of the bottom area of the pocket hole is higher than that of the end area of the locking claw, and the ovalization deformation of the pocket hole and the centrifugal deformation of the locking claw are cooperatively inhibited; the functionally graded material is introduced to actively reconstruct the stiffness field of the crown-shaped cage; the toughness phase is constructed in the locking claw area to absorb collision energy, the reinforced phase is formed in the pocket hole area to weaken stress concentration, and the stiffness gradient is established at the connecting position to inhibit the umbrella effect; and the application provides the crown-shaped cage with the characteristics of high toughness, gradient and high strength and a design method thereof.

This invention relates to the field of polymer materials technology, and discloses a low-temperature resistant and high-impact protective face shield material and its preparation method. The protective face shield material of this invention comprises the following raw materials in parts by weight: 55-70 parts of nylon 66, 5-15 parts of nylon 6, 5-12 parts of a low-temperature toughening agent, 4-10 parts of a high-temperature resistant additive, 0.5-1 part of oleamide, 0.2-0.5 parts of silane coupling agent 550, 0.2-0.5 parts of an antioxidant, and 0.5-1.5 parts of an ultraviolet absorber. The low-temperature toughening agent of this invention can improve the impact resistance of nylon materials in low-temperature environments, maintaining excellent impact strength even at low temperatures. The high-temperature resistant additive gives the nylon material excellent high-temperature thermal stability, avoiding problems such as softening deformation, yellowing cracking, and mechanical property degradation at high temperatures.

The application belongs to the technical field of nylon 66 composite materials, and discloses a heat-conducting composite filler, a preparation method thereof and application of the heat-conducting composite filler in nylon 66. The heat-conducting composite filler is composed of boron nitride (BN@PDA) modified by dopamine and magnesium oxide (MgO-KH560) modified by a silane coupling agent, and the mass ratio is 1-3:1. Through two-step surface modification and solution chemical bonding, the close combination between components is realized, and the problems of uneven dispersion of traditional single heat-conducting filler, poor compatibility with the nylon 66 matrix and weak heat-conducting synergistic effect are effectively solved. When the heat-conducting composite filler is applied to nylon 66 composite materials at an addition amount of 10-30wt%, the thermal conductivity of the nylon 66 can be improved to more than 0.8 W / (m·K), the tensile strength is improved by 17%, and the heat-conducting composite filler has excellent processing performance, and is suitable for the fields of electronic equipment heat dissipation components, LED packaging materials, automobile heat management components and other fields with strict requirements on the thermal conductivity of materials.

The application provides a kind of composite deposition fiber and its preparation method, specific steps are as follows: nylon 66 chip is added to solvent, heating stirring obtains nylon 66 solution;Para-aramid short fiber is added to nylon 66 solution, heating stirring obtains aramid / nylon 66 mixed solution;Aramid / nylon 66 mixed solution is dropped into coagulation bath to carry out shearing, and aramid / nylon 66 composite deposition fiber is obtained;Aramid / nylon 66 composite deposition fiber is placed in modified carbon nanotube dispersion liquid and is ultrasonically treated, and finally aramid / nylon 66 / carbon nanotube composite deposition fiber is obtained.The composite deposition fiber prepared by the application can prepare paper-based composite material with higher mechanical property, has certain conductivity, and also shows good gas sensitivity, which provides a new design idea for the preparation of multifunctional sensing material.

This utility model discloses a filtration device for purifying nylon 66 salt, relating to the technical field of nylon 66 salt filtration devices. The utility model includes a frame and a filter barrel mounted on the upper side of the frame. An inlet pipe and an outlet pipe are connected to the frame. A fixed plate is located at one end of the outlet pipe, which extends into the filter barrel. Multiple L-shaped connecting strips are arranged in a circumferential array on the side of the fixed plate. Multiple extrusion blocks are arranged along the height direction on the inner side of the L-shaped connecting strips. The extrusion blocks elastically slide and engage with the inner side of the L-shaped connecting strips. An installation hole is provided on the side of the outlet pipe, and a columnar filter with one end inserted into the installation hole is located on one side of each extrusion block. In this utility model, nylon 66 salt solution enters the filter barrel through the inlet pipe, is filtered by multiple columnar filters, and then discharged through the outlet pipe. When replacing the columnar filter, the filter barrel is removed, and then the columnar filter is manually pushed, causing the extrusion blocks to slide elastically, allowing one end of the columnar filter to slide out of the installation hole, facilitating quick disassembly of the columnar filter.

The application discloses a kind of special nylon cable fiber of salt corrosion resistance of deep sea operation and preparation method thereof, including core layer and sheath layer, it is characterized in that, the mass ratio of core layer and sheath layer is 7:3;The core layer raw material includes: nylon 6 chip 88-92 parts, hyperbranched nylon toughening agent 2-4 parts, nano calcium carbonate whisker precursor 1-2 parts, high-pressure modifier 0.5-1 part, initiator 0.2-0.4 part;The sheath layer raw material includes: nylon 66 / polybutylene terephthalate blend chip 80-85 parts, silicon carbide powder 4-6 parts, sepiolite nanofiber 2-3 parts, seawater resistant modifier 1-2 parts, compatible agent 0.5-1 part, the special nylon cable fiber of salt corrosion resistance of deep sea operation and preparation method thereof disclosed in the application can tolerate the abrasion, extrusion, scratch of seabed rock, simultaneously has the characteristics of seawater corrosion resistance, deep sea high pressure resistance, low temperature fatigue resistance.

A regenerated nylon 66 fiber characterized by containing 5% by weight or more of regenerated nylon 66, having a total fineness of 110-2100 dtex, a strength of 7.6-10.0 cN / dtex, and an elongation of 15.0-35.0%. A material, regenerated nylon 66 fiber, having high strength and good hair quality is provided.

The utility model relates to energy -conserving door and window section bar processing technical field discloses a kind of aluminium-plated aluminium plastic co-extrusion composite section bar buckle structure, including aluminium lining and aluminium section bar, two the aluminium lining outer wall is fixedly connected with microcellular hard skin PVC, the microcellular hard skin PVC left end is provided with PVDF alloy film, the PVDF alloy film is used to decorate and block outside article directly with microcellular hard skin PVC contact, the microcellular hard skin PVC right end is fixedly connected with buckle main body, the aluminium section bar left end is provided with clamping slot, two the aluminium lining is fixedly connected with nylon 66 heat insulation strip to inner end. In the utility model, by wrapping a layer of 3~6mm microcellular hard skin PVC on aluminium lining outer wall, aluminium-plated aluminium plastic co-extrusion composite section bar can be formed, heat conduction between two aluminium linings can be blocked by the cooperation of nylon 66 heat insulation strip and foamed polyurethane, and meanwhile, nylon 66 heat insulation strip and foamed polyurethane also have good heat insulation performance, so that the energy-saving effect of frame material can be greatly improved.

The application relates to an anti-migration modified aluminum diethyl phosphinate and a preparation method thereof, and belongs to the technical field of flame retardants. The preparation method of the anti-migration modified aluminum diethyl phosphinate comprises three steps of synthesizing aluminum diethyl phosphinate superfine powder, one-time coating of hydroxyapatite and secondary coating of MQ silicon resin. After the anti-migration modified aluminum diethyl phosphinate is added into nylon 66 at an addition amount of 6 wt%, the tensile strength of the nylon 66 is 80.8-84.2 MPa, the bending strength is 120.6-124.1 MPa, the bending modulus is 3.1-3.3 GPa, the notched impact strength is 11.8-14.9 kJ / m 2 , the limiting oxygen index is 34.3-35.6%, the UL-94 V flame retardant grade reaches V-0 grade, the dispersion uniformity is 0, the anti-migration property is no precipitation, and the acidic corrosion loss amount is 0.07-0.1%.

This utility model relates to the field of building door and window technology, and particularly to a thermally insulated hook structure with no cold bridge between indoor and outdoor surfaces. It includes an outdoor aluminum alloy profile, an indoor aluminum alloy profile, and a double-glazed unit installed in the middle. It also includes longitudinally installed thermal insulation strips A and B, a groove, and a cover plate. The groove is used for overlapping the aluminum alloy lift window and is fixed to the indoor aluminum alloy profile with screws. The cover plate covers and fastens to the thermal insulation strip A and the groove via a connecting assembly. In use, because the groove overlaps with polyamide nylon 66 material, and the cover plate covers and fastens to the thermal insulation strip A and the groove via the connecting assembly, heat transfer at this point is blocked. A continuous isotherm is formed between the groove, the cover plate, thermal insulation strips A and B, and the double-glazed unit, greatly improving the thermal performance of the door and window at the hook.

This invention discloses a wear-resistant clothing fabric and its preparation method, belonging to the field of textile technology. It comprises, from the outside in, a wear-resistant surface layer, a microcapsule self-healing layer, a main functional film layer, a salt-retaining buffer layer, and a moisture-wicking inner layer, sequentially connected by dotted hot-pressing composite bonding. The wear-resistant surface layer is a double-layer asymmetric fabric woven from gradient functional core-spun yarns of copolymerized modified nylon 66, island-type composite fibers, and carbon nanotube composite nylon 66 fibers. The microcapsule self-healing layer is a polyurethane film with microcapsules capable of dynamic covalent bond exchange and self-healing. This invention achieves long-term UV resistance through copolymerized modified fibers, utilizes hydrogel microspheres to retain and release chloride ions, actively repairs damage with the microcapsule self-healing layer and dynamic covalent bond materials, and eliminates galvanic corrosion using all-plastic accessories and a conductive network, effectively slowing down the performance degradation of the fabric in high-salt-spray environments.

This invention relates to the field of polymer materials technology, and discloses a flame-retardant nylon material for protective face shields and its preparation method. The flame-retardant nylon material of this invention comprises the following raw materials in parts by weight: 50-65 parts nylon 66 resin, 5-15 parts montmorillonite, 3-7 parts Zr-MOF-PS, 4-8 parts modified toughening agent, 0.1-0.5 parts antioxidant, 0.1-0.4 parts light stabilizer, 0.2-0.5 parts heat stabilizer, 0.2-0.6 parts bis-stearamide, and 0.3-0.8 parts isopropyltriethoxysilane. The Zr-MOF-PS of this invention can improve the flame-retardant properties of the nylon matrix, forming a dense and stable char layer upon contact with fire to block the spread of flames, while effectively inhibiting the release of toxic fumes. The modified toughening agent can improve the impact resistance and bending resistance of the protective face shield, effectively preventing problems such as cracking, breakage, and deformation.

This invention relates to the field of chemical fiber technology, specifically to a high-amino nylon 66 fiber and its preparation process, comprising: S1 synthesizing a high-amino polymer; S2, under nitrogen protection, adding a catalyst and caprolactam or lauryl lactam to perform in-situ ring-opening polymerization on the surface of the high-amino polymer powder to generate a nylon 6 or nylon 12 coating layer; S3, melting and blending the coated high-amino polymer powder with PA66 chips in a certain proportion using a twin-screw extruder to obtain a high-amino functional masterbatch; and S4, preparing the high-amino nylon 66 fiber. The core of this invention lies in designing and synthesizing a high-amino polymer with a structure highly similar to PA66 but with an extremely high terminal amino content. Through an innovative "microencapsulation-masterbatch" technology, the dispersibility and thermal stability issues in the PA66 matrix are solved. Finally, through precise metering and blending spinning, a highly reactive nylon 66 fiber with controllable amino content is prepared.

This invention provides a water-resistant and abrasion-resistant fabric and its preparation method, relating to the field of fabric technology. The preparation method of the water-resistant and abrasion-resistant fabric of this invention includes the following steps: (1) Nylon 66 masterbatch is mixed with modified nano-carbon black, modified nano-titanium carbide, hyperbranched polyester dispersant, and antioxidant, and then extruded using a twin-screw extruder to obtain a black masterbatch; (2) The masterbatch obtained in step (1) is melt-spun, cooled, and then stretched to produce a 70 / 48F yarn; (3) The yarn obtained in step (2) is used as the outer yarn and combined with spandex core yarn through a machine-wrapping process to prepare a core-spun yarn, which is then woven to obtain a grey fabric; (4) The grey fabric obtained in step (3) is washed and shaped to obtain a water-resistant and abrasion-resistant fabric. This invention improves the abrasion resistance and waterproof rating of the fabric, maintains long-lasting waterproof performance, improves the fabric's hand feel, and enhances the fabric's wash fastness.

The application discloses a kind of anti-impact nylon fibre for spacesuit and its preparation method, comprising: high molecular weight nylon 66 matrix 86.0-92.0wt%, multi-dimensional nano reinforcing phase 1.2-2.0wt%, multifunctional anti-impact microsphere 4.0-7.0wt%, in-situ interface compatibilizer and crosslinking point regulator 0.5-1.2wt%, aerospace-grade multifunctional stabilizing aid: 1.0-2.8wt%;The multi-dimensional nano reinforcing phase is compounded by amino graphene and amino carbon nanotube according to mass ratio 1:3-4;The multifunctional anti-impact microsphere is hollow polysiloxane-titania composite microsphere, the anti-impact nylon fibre for spacesuit and its preparation method disclosed by the application can realize the multifunctional integration of nylon fibre, meet the demand of space suit fibre.

This invention belongs to the field of polymer materials technology and discloses an intrinsically antibacterial nylon 66 material for large-scale surgical sutures and its preparation method. The material possesses excellent mechanical properties, a high melting point, and good wear resistance, while also exhibiting excellent antibacterial properties. Furthermore, the preparation method uses fewer raw materials, has a simple production process, and is suitable for large-scale production, making it well-suited for applications in the medical field.

This invention discloses a method for preparing a high-temperature resistant modified nylon 66 composite fiber material, relating to the field of nylon technology. The method includes the steps of preparing a composite reinforcing antioxidant component, preparing modified nano-silica, and obtaining the composite fiber material. The raw materials used to prepare the composite reinforcing antioxidant component include maleic anhydride-grafted polyolefin elastomer, 1,6-hexanediamine, processing stabilizer, 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid, and p-toluenesulfonic acid. The raw materials used to prepare the modified nano-silica include nano-silica and a composite silane coupling agent. The raw materials used to obtain the composite fiber material include nylon 66 resin, the composite reinforcing antioxidant component, modified nano-silica, pentaerythritol stearate, epoxy resin, and a composite antioxidant additive. The nylon 66 composite fiber material prepared by this invention exhibits strong high-temperature resistance, excellent mechanical properties, and superior aging resistance.

The application discloses a preparation method of high-strength fine denier large-brightness nylon 66 fully-drawing fiber. Firstly, nylon 66 spinning grade chips with a relative viscosity of 2.4-2.6 are solid-phase increased in viscosity to obtain nylon 66 medium-high viscosity chips with water content of less than or equal to 300 ppm and a relative viscosity of 3.0-3.2; then the chips are sent to a screw extruder for melt extrusion; the extruded melt is sent into a spinning box and is pressed into a spinning assembly by a metering pump; the melt is sprayed from a spinneret plate of the spinning assembly to form a fiber bundle; the sprayed melt is cooled to form a nascent fiber bundle; the obtained nascent fiber bundle is oiled by an oil nozzle crude oil; the oiled fiber bundle is subjected to three-stage hot drawing and two-stage relaxation heat setting; and finally, the fiber bundle is wound to obtain the high-strength fine denier large-brightness nylon 66 fully-drawing fiber. According to the application, the high-strength fine denier fiber with more stable structure and higher orientation degree can be prepared, the physical properties of the obtained high-strength fine denier fiber are more uniform, and the breaking strength and the breaking strength retention rate are higher, so that the continuous and stable production of the high-strength fine denier nylon 66 fiber is realized.

This invention discloses a surface modification method for preventing pore blockage in porous high-entropy oxides and its application in polymer-based microwave absorbing materials, belonging to the field of surface modification technology for electromagnetic functional materials. The method includes: providing porous high-entropy oxides with a porosity of 30%~70% and a pore size of 0.2~10μm; selectively constructing a low surface energy barrier layer on the outer surface and pore openings of the porous high-entropy oxide particles via vapor deposition or liquid-phase self-assembly, while utilizing the diffusion-limiting effect during deposition to form a pore-narrowing bottleneck structure; the barrier layer thickness is 5~50nm, ensuring a contact angle ≥100° between the polymer melt and the filler surface at the corresponding processing temperature; the pore size of the bottleneck structure is 10~150nm, and the pore size is smaller than the internal pore size, which is maintained at 0.2~10μm. When this surface-modified porous high-entropy oxide is applied to polymer-based microwave absorbing materials, after melt processing (thermoplastic) or curing (thermosetting), the pore retention rate, based on mercury intrusion porosimetry and SEM statistics, is ≥85%, and the atomic percentage of characteristic elements in the barrier layer inside the pores is ≤1%. The modified porous (FeCoNiMnCr)O... X Taking nylon 66 filler as an example, the resulting composite material exhibits a minimum reflection loss of ≤-27dB in the 2~18GHz frequency band, an effective absorption bandwidth of ≥5.5GHz, and a tensile strength of ≥35MPa. This invention effectively solves the common technical problem of easy pore blockage in porous high-entropy oxides during polymer composite processes, combining process controllability with industrial application value.

The utility model discloses a slice drying device with nylon 66 wet slice preheating structure relates to chemical fibre production technical field, including replacement stock bin, buffer bin, drying tower and nitrogen gas purification system, the top of drying tower is provided with drying tower feed port, waste heat recovery port and nitrogen gas export, the bottom of buffer bin is provided with nitrogen gas distributor, and nitrogen gas distributor passes through fan and connects waste heat recovery port, and nitrogen gas export connects nitrogen gas purification system. Through the preheating temperature rise of drying tower feed wet slice, the relative stability of wet slice temperature that enters drying tower is guaranteed, the fluctuation of drying tower temperature caused by the temperature difference of feed is avoided, the stability of drying tower operation and the uniformity of dry slice moisture content are effectively improved, the drying time of drying tower is further shortened, and the drying efficiency is effectively improved.

This invention provides a composite nucleating agent and its application in the preparation of nylon 66 composite materials, belonging to the field of nylon 66 composite materials. The composite nucleating agent is composed of a first nucleating agent and a second nucleating agent, which synergistically regulate the crystallization behavior of nylon 66. The first nucleating agent is zinc oxide or silicon dioxide; the second nucleating agent is one or more of sodium benzoate, disodium hydrogen phosphate, zinc phenylphosphonate, and sodium stearate. The mass ratio of the second nucleating agent to the first nucleating agent ranges from 1:1 to 5:1. The composite nucleating agent of this invention, when used in the preparation of nylon 66 composite materials, can effectively improve the crystallization properties of nylon 66, achieving a good balance between low water absorption and excellent mechanical properties in nylon 66 composite materials.

This invention relates to the field of functional nylon material research and development technology, and discloses a high-strength modified nylon 66 material and its preparation method. Specifically, it involves synthesizing a flame-retardant epoxy crosslinking agent I containing disulfide bonds and a flame-retardant epoxy crosslinking agent II containing multiple hydrogen bonds; utilizing the flame-retardant epoxy crosslinking agent I and the flame-retardant epoxy crosslinking agent II to undergo a ring-opening crosslinking reaction with the terminal amino / carboxyl groups of nylon 66 through epoxy groups, introducing a dual dynamic crosslinking network between the nylon 66 molecular chains to obtain a high-strength modified nylon 66 material. This invention significantly improves the mechanical strength, intrinsic flame-retardant properties, and damage self-healing ability of nylon 66 material through the synergistic effect of the dual dynamic crosslinking mechanism, while retaining its original thermoplastic processing characteristics. It can replace traditional fiber-reinforced nylon 66 composite materials or metal structural parts, and can be used in high-precision, high-reliability lightweight structural components in the fields of automotive parts, electronics and electrical engineering, aerospace, or machinery manufacturing.

The utility model relates to heavy truck suspension system technical field discloses a heavy truck thrust rod end cover, including fixed link, the left and right ends of fixed link all install buffer pipe, the end of buffer pipe is fixedly connected with end cover body, the inside of end cover body is equipped with annular groove, the inboard of annular groove installs elastic sealing ring, in the utility model, end cover body is nylon 66 injection molding, its inner wall is equipped with annular groove, elastic sealing ring is fluorine rubber material, is nested in annular groove, metal reinforcing ring is stainless steel stamping part, is embedded in the outer edge of end cover body, when vehicle vibration, buffer pipe absorbs axial impact, end cover body damping characteristic reduces the vibration energy that transmits to metal reinforcing ring, metal reinforcing ring restricts the plastic deformation of end cover body under long -term load, maintains the pre -tightening force of sealing ring, elastic sealing ring is tightly close to thrust rod journal under radial compression force, blocks dust and moisture invasion.

The application discloses high-strength cotton yarn fabric and a preparation method thereof, and relates to the technical field of cotton yarn fabric preparation, which comprises the following component raw materials: modified nylon 66 filaments, reinforcing fibers and spandex fibers; in the application, the reinforcing fibers are added, food-grade tea polyphenol is used as a coordination bridge, and a room-temperature one-step modification process of aluminum ions and octyltrimethoxysilane is adopted, so that high-temperature baking or toxic reagents are not needed, the process is green and environment-friendly, and the natural structure of cotton fibers is not damaged; after modification, the skin-friendly and moisture-absorbing characteristics of cotton fibers are retained, the stiffness of nylon fabric is effectively improved, the secondary combination of the tea polyphenol-aluminum coordination structure and the functional groups on the surface of nylon 66 chip reinforcing fibers is formed, the interfacial bonding force between blended fibers is improved, and fabric pilling is reduced; a synergistic effect is formed with the modified nylon 66 filaments, the overall hydrophobic uniformity and washing resistance of the fabric are improved, the swelling and shrinkage of cotton fibers in a humid and hot environment are inhibited, and the size stability of the fabric is ensured.

This application relates to the technical field of fabric finishing, and particularly to a bio-based water repellent, a water-repellent fabric, and their preparation methods and applications. By designing a non-isocyanate polyurethane obtained by the reaction of a cyclic carbonate and an amine, which contains no fluorine element and isocyanate group residue, and has one or more hydroxyl groups in the molecular chain to provide adhesion to nylon 66 or polyamide fabrics, and then using dehydroabietylamine to cap it, thereby improving the washability and wrinkle resistance of the bio-based water repellent. On this basis, aminopropyl heptaisobutylcage polyhedral oligomeric silsesquioxane is also used as an optional auxiliary capping agent to further improve the waterproofness of the bio-based water repellent.

The application relates to the technical field of high polymer materials, and discloses a low-temperature-resistant nylon composite material and a preparation method thereof. The nylon composite material prepared by the application comprises the following raw materials in parts by weight: nylon 6 45-55 parts, nylon 66 15-25 parts, castor oil-based reinforcing agent 2-5 parts, glass fiber 7-10 parts, toughening agent 5-10 parts, dispersing agent 0.5-1 part, lubricant 0.5-2 parts, antioxidant 0.7-1.5 parts, and coupling agent 1-2 parts. The nylon composite material is prepared by taking nylon 6 and nylon 66 as main raw materials and adding functional additives such as the toughening agent and the castor oil-based reinforcing agent, so that the low-temperature resistance and impact toughness of the composite material are improved, and the generation of low-temperature brittleness is reduced. The toughening agent and the castor oil-based reinforcing agent significantly improve the low-temperature resistance through plastic-toughening synergistic action and dynamic-elastic network complementation mechanisms.

This invention provides a method for preparing high-strength, low-water-absorption nylon 66, belonging to the technical field of modified nylon material preparation. The steps include: preparing cerium methacrylate by reacting water, methacrylic acid, and cerium carbonate as raw materials; mixing cerium methacrylate, silane coupling agent KH151, glass fiber, and dried nylon 66 to obtain a mixture; melt-extruding the mixture using a twin-screw extruder and granulating it using a pelletizer to obtain granules; injection molding the granules using an injection molding machine to obtain injection-molded samples; and subjecting the injection-molded samples to electron beam irradiation to obtain high-strength, low-water-absorption nylon 66. This invention provides a method for preparing high-strength, low-water-absorption nylon 66, which can further improve the tensile strength of glass fiber reinforced nylon 66 while reducing its water absorption rate.

A continuous production apparatus for nylon 66 includes a concentration tank, a prepolymerization reactor, and a final polymerization reactor. The inlet of the concentration tank is connected to a nylon 66 salt solution device, and the outlet of the concentration tank supplies feed to the prepolymerization reactor via a reaction preheater. The outlet of the prepolymerization reactor supplies feed to the final polymerization reactor via a feeding pipeline and a flash evaporator. The feeding pipeline is connected to a titanium dioxide suspension device. This invention has a simple structure, is easy to operate, and can continuously produce high-quality full-matte / semi-matte nylon 66 materials.