Xenon lamp aging resistant orange halogen-free flame-retardant nylon corrugated pipe and preparation method thereof

Abstract

The application provides a preparation method of a xenon lamp aging-resistant orange halogen-free flame-retardant nylon corrugated pipe, belongs to the technical field of high polymer material modification, and is prepared from the following raw materials in parts by weight: polyamide (PA) raw material resin 62-79 parts, weather-resistant color master batch 1.0-4.0 parts, anti-precipitation flame-retardant master batch 18.0-28.0 parts, and integrated weather-resistant synergistic additive 2.0-6.0 parts. The preparation method comprises the following steps: respectively preparing the weather-resistant color master batch, the anti-precipitation flame-retardant master batch and the integrated weather-resistant synergistic additive, then mixing them with the PA raw material resin, and then melt-extruding and molding. Through the synergistic effect of the three special functional components, the technical problems of poor outdoor weather resistance, fast color and performance attenuation of the existing orange halogen-free flame-retardant PA corrugated pipe are solved. After the obtained product is subjected to xenon lamp accelerated aging test, the product can maintain good comprehensive performance, for example, under the preferred formula, the product can maintain V-0 level flame-retardant grade, high tensile strength retention rate and color stability.

Description

Technical Field

[0001] This invention belongs to the field of polymer material modification and pipe manufacturing technology, specifically relating to an orange nylon (polyamide) corrugated pipe with excellent long-term weather resistance, color stability and halogen-free flame retardant properties, as well as its preparation method and application. Background Technology

[0002] Nylon (PA, polyamide) has become the preferred material for manufacturing protective corrugated conduits for precision cables due to its excellent mechanical strength, abrasion resistance, oil resistance, and self-lubricating properties. With increasingly stringent environmental and safety regulations, in fields such as rail transportation, new energy equipment (e.g., photovoltaic power stations, energy storage systems), outdoor engineering machinery, and high-end home appliances, cable sheathing materials are required not only to have good mechanical properties but also to meet specific halogen-free flame-retardant requirements to avoid the generation of large amounts of toxic and corrosive hydrogen halide gases during combustion. Furthermore, for ease of system wiring, functional differentiation, and safety warnings, the industry often uses a bright orange color for these critical conduits.

[0003] However, existing conventional halogen-free flame-retardant orange nylon corrugated pipes face significant technical bottlenecks in meeting the requirements for long-term outdoor use: 1. The contradiction between weather resistance (especially light aging resistance) and color stability: Traditional ultraviolet absorber and light stabilizer systems, while protecting the nylon matrix, often fail to effectively protect the photosensitive organic pigments, resulting in unacceptable fading or discoloration of the pipe appearance in a short period of time, thus losing its safety marking function.

[0004] 2. The challenge of synergistic effects between halogen-free flame retardant systems and long-term thermal / photostable properties: Under long-term outdoor thermal-oxidative aging and ultraviolet radiation, conventional halogen-free flame retardants are prone to migration, precipitation (commonly known as "frosting"), or chemical decomposition. This not only leads to white spots on the surface of the corrugated pipe, affecting its appearance, but also seriously impairs the durability of the flame retardant effect and may accelerate the decline in the overall mechanical properties of the material due to interface defects.

[0005] 3. The challenge of balancing comprehensive performance in a multi-component system: High-performance outdoor corrugated pipes need to balance multiple components such as nylon base material, halogen-free flame retardant, pigment, antioxidant, and light stabilizer. There may be complex interactions between these additives, making the formulation design difficult.

[0006] Currently, common products on the market often struggle to maintain excellent color retention, good mechanical property retention, and stable flame retardant rating simultaneously after rigorous testing simulating all-weather solar radiation (such as xenon lamp aging). Therefore, developing an orange halogen-free flame-retardant nylon corrugated pipe that can maintain stable color, excellent mechanical properties, and no decay in flame retardant rating under simulated all-weather solar radiation (such as xenon lamp aging) conditions has become a pressing technical problem to be solved in this field. Summary of the Invention

[0007] This invention aims to overcome the shortcomings of existing technologies and provide a xenon lamp aging-resistant orange halogen-free flame-retardant nylon corrugated pipe and its preparation method. This corrugated pipe solves the problems of easy color fading, rapid degradation of mechanical properties, and difficulty in maintaining flame-retardant performance in outdoor use by synergistically using specially formulated weather-resistant masterbatch, anti-exudation flame-retardant masterbatch, and integrated weather-resistant synergistic additives in its formulation, and through optimized process preparation. It is particularly suitable for outdoor or semi-outdoor cable protection scenarios with extremely high reliability requirements.

[0008] This invention provides the following technical solution: In a first aspect, the present invention provides a xenon lamp aging resistant orange halogen-free flame-retardant nylon corrugated pipe, made from raw materials comprising the following parts by weight: Polyamide (PA) raw material resin 62-79 parts; Weather-resistant masterbatch: 1.0-4.0 parts; 18.0-28.0 parts of anti-exudation flame retardant masterbatch; Integrated weather-resistant synergistic agent 2.0-6.0 parts.

[0009] Specifically, the core product of this invention is defined as follows: four essential components work synergistically within a specific dosage range. Its technical effect lies in providing initial color and color stability through "weather-resistant masterbatch", providing basic and long-lasting flame retardancy through "anti-exudation flame retardant masterbatch", providing long-term anti-aging protection through "integrated weather-resistant synergistic additive", and forming a matrix from "PA raw material resin". Together, they solve the technical problems of long-term weather resistance, color stability and flame retardancy durability of outdoor orange halogen-free flame-retardant nylon corrugated pipes pointed out in the background art.

[0010] Furthermore, the amount of the weather-resistant masterbatch is 2.0-4.0 parts; the amount of the anti-exudation flame-retardant masterbatch is 23.0-28.0 parts. The amounts of the weather-resistant masterbatch and the anti-exudation flame-retardant masterbatch are further optimized, and the amount of the "anti-exudation flame-retardant masterbatch" is limited to 23.0-28.0 parts. The technical effect is clear that it can achieve and maintain the best flame-retardant performance of V-0 level after xenon lamp aging.

[0011] Further, the weather-resistant masterbatch is made from the following components in parts by weight: 8.0-15.0 parts of high weather-resistant orange pigment, 10.0-18.0 parts of high weather-resistant yellow pigment, 0-0.1 parts of carbon black, 0-3.5 parts of titanium dioxide, 0.5-1.4 parts of processing lubricant, 0.5-1.0 parts of processing heat stabilizer, 10-15 parts of PA powder, and 46-71 parts of PA raw material resin; This section specifies the detailed composition and proportions of the "weather-resistant masterbatch". By using specific types and amounts of high weather-resistant pigments (orange and yellow powders), trace amounts of carbon black and titanium dioxide (for tinting and masking), processing aids, and PA carriers, the high weather resistance and processability of the masterbatch itself are ensured, thus laying the foundation for the color stability of the final product.

[0012] Furthermore, the high weather-resistant orange pigment can be selected from at least one of pyrrolopyrrole dione (such as DPP Orange PO73), benzimidazolone (such as PO64), or isoindolineone (such as PO61) orange pigments; the high weather-resistant yellow pigment can be selected from at least one of titanium nickel yellow, coated bismuth vanadate yellow, benzimidazolone (such as PY109), or isoindolineone (such as PY110) yellow pigments. The specific types of high weather-resistant orange and yellow pigments are further defined here. The listed pigment types (such as DPP Orange, titanium nickel yellow, etc.) are all recognized in the art as having excellent lightfastness and weather resistance. The technical effect of this limitation is to ensure the long-lasting stability of the color from the source of the raw materials.

[0013] Further, the anti-exudation flame retardant masterbatch is made from the following components in parts by weight: 40.0-50.0 parts of synergistic halogen-free flame retardant powder, 0-0.3 parts of processing lubricant, 0-3.0 parts of compatibilizer, 0.5-1.0 parts of processing heat stabilizer, and 45.7-59.5 parts of PA powder. The synergistic halogen-free flame retardant powder is a mixture of metal phosphinate and nitrogen-containing flame retardant synergist in a weight ratio of 2:1 to 3:1. The metal phosphinate is preferably a dialkyl phosphinate, such as aluminum diethyl phosphinate. The nitrogen-containing flame retardant synergist is preferably melamine cyanurate (MCA) or melamine pyrophosphate (MPP). The compatibilizer is preferably at least one of maleic anhydride-grafted polyolefin elastomer (POE-g-MAH), maleic anhydride-grafted polyethylene (PE-g-MAH), or organosilicon compatibilizer. This section specifies the detailed composition of the "anti-exudation flame retardant masterbatch." Its core lies in the specific compounding ratio of "synergistic halogen-free flame retardant powder" (metal phosphinate and nitrogen-containing synergist) and the use of a "compatibility agent." This combination effectively inhibits the migration and exudation of flame retardants (anti-exudation), ensuring the durability of the flame retardant effect. Processing heat stabilizers and PA carriers ensure the processing stability of the masterbatch.

[0014] Further, the integrated weather-resistant synergistic agent is made from the following components in parts by weight: 10.0-20.0 parts of anti-photoaging agent, 10.0-20.0 parts of antioxidant, 0-0.3 parts of processing lubricant, and 59.7-80.0 parts of PA raw material resin. The anti-photoaging agent is a compound of ultraviolet absorbers (such as UV-234, UV-326, UV-329) and hindered amine light stabilizers (HALS) in a weight ratio of 1:1 to 1:1.2. This section specifies the detailed composition of the "integrated weather-resistant synergistic agent." By pre-compounding a specific ratio of "anti-photoaging agent" (UVA+HALS) and "antioxidant" (primary antioxidant + secondary antioxidant) into the PA carrier, a synergistic protection system is formed, which can simultaneously resist photo-oxidative and thermo-oxidative aging. This provides long-term, comprehensive protection for the matrix resin and pigments, which is key to achieving high mechanical property retention. Further, the hindered amine light stabilizer is preferably a non-alkaline or low-alkaline HALS (such as Tiangang® HS-300, HALS622). The antioxidant is a compound of hindered phenolic primary antioxidants (such as Irganox 1098, 1010) and phosphite secondary antioxidants (such as ADKSTABPEP-36, Irgafos 168) in a weight ratio of 1:1 to 1:2. This specification defines hindered amine light stabilizers (HALS) as "non-alkaline or low-alkaline". This limitation aims to prevent adverse reactions between alkaline HALS and the nylon (PA) matrix, which could affect the long-term performance of the material and ensure the compatibility and effectiveness of the weather-resistant system.

[0015] Secondly, the present invention provides a method for preparing the xenon lamp aging resistant orange halogen-free flame-retardant nylon corrugated pipe as described above, comprising the following steps: S1. Preparation of weather-resistant masterbatch: By weight, 8.0-15.0 parts of high weather-resistant orange pigment, 10.0-18.0 parts of high weather-resistant yellow pigment, 0-0.1 parts of carbon black, 0-3.5 parts of titanium dioxide, 0.5-1.4 parts of processing lubricant, 0.5-1.0 parts of processing heat stabilizer, 10-15 parts of PA powder and 46-71 parts of PA raw material resin are mixed and the weather-resistant masterbatch is prepared by melt extrusion granulation process; S2. Preparation of anti-expansion flame retardant masterbatch: By weight, 40.0-50.0 parts of synergistic halogen-free flame retardant powder, 0-0.3 parts of processing lubricant, 0-3.0 parts of compatibilizer, 0.5-1.0 parts of processing heat stabilizer and 45.7-59.5 parts of PA powder are mixed and the anti-expansion flame retardant masterbatch is prepared by melt extrusion granulation process; S3. Preparation of integrated weather-resistant synergistic agent: By weight, 10.0-20.0 parts of anti-photoaging agent, 10.0-20.0 parts of antioxidant, 0-0.3 parts of processing lubricant and 59.7-80.0 parts of PA raw material resin are mixed and the integrated weather-resistant synergistic agent is prepared by melt extrusion granulation process; S4. Preparation of the final corrugated pipe: By weight, 62-79 parts of polyamide (PA) raw resin, 1.0-4.0 parts of the weather-resistant masterbatch obtained in step S1, 18.0-28.0 parts of the anti-expiration flame-retardant masterbatch obtained in step S2, and 2.0-6.0 parts of the integrated weather-resistant synergist obtained in step S3 are mixed, dried, melt-extruded and wound through a screw extruder to obtain the xenon lamp aging resistant orange halogen-free flame-retardant nylon corrugated pipe.

[0016] Preferably, in step S1, the melt temperature of the melt extrusion is controlled at 265℃-275℃; in step S2, the die temperature of the melt extrusion is 225℃-235℃; and in step S4, the die temperature of the melt extrusion is 265℃-275℃. The PA raw material resin used in each step is preferably PA6 resin with a relative viscosity of 3.8-4.2, such as BASFUltramid® B40.

[0017] Thirdly, the present invention provides the application of the xenon lamp aging resistant orange halogen-free flame-retardant nylon corrugated pipe described above in cable protection for rail transit, new energy equipment, outdoor engineering machinery or high-end home appliances.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. Superior long-term weather resistance and color stability: By employing a highly weather-resistant organic / inorganic composite pigment system (weather-resistant masterbatch) and an integrated weather-resistant synergistic additive (a high-efficiency UVA / HALS composite light stabilizer system synergistically combined with primary and secondary antioxidants), the material's resistance to ultraviolet radiation and thermo-oxidative aging is significantly improved. After 1000 hours of xenon lamp aging, the product shows minimal color change (gray card rating reaches 4-5), with no powdering or cracking on the surface.

[0019] 2. Durable and stable halogen-free flame retardant performance: The innovative anti-deposition flame retardant masterbatch adopts a synergistic flame retardant system of metal phosphinate and nitrogen-based synergists, combined with compatibilizer technology, to effectively inhibit the migration and precipitation of flame retardants during long-term aging. After xenon lamp aging, the flame retardant rating can maintain V-0 (UL94), meeting the long-term safety requirements of high-end applications.

[0020] 3. Excellent mechanical property retention: The integrated weather-resistant synergist has good compatibility with the matrix resin and flame retardant system, effectively preventing polymer molecular chains from breaking under light and heat. Tests show that the tensile strength retention rate after xenon lamp aging can reach over 85%, and the strength retention rate after 500 hours of heat aging at 150℃ can reach over 84%, demonstrating excellent durability.

[0021] 4. Clear Balance and Synergistic Effect of Comprehensive Performance: This invention achieves a high-performance balance of multiple components through a unique "three-in-one" functional masterbatch / additive system design. Experiments show that the anti-exudation flame-retardant masterbatch is a necessary condition for ensuring basic safety (V-0 flame retardancy); the integrated weather-resistant synergistic additive is key to maintaining long-term durability (high mechanical property retention rate and color stability); and the weather-resistant color masterbatch plays an irreplaceable role in maintaining long-term outdoor color stability. The synergy of these three components solves the three core issues of safety, durability, and appearance identification in outdoor applications. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 The images show a comparison of samples before and after xenon lamp aging, visually demonstrating the color and appearance stability of the corrugated pipe prepared by this invention after aging. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and comparative experiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0024] The main raw materials used in the embodiments and comparative examples of this invention are as follows, but are not limited thereto: PA raw material resin: BASFUltramid® B40 (PA6, relative viscosity approximately 4.0); High weather-resistant orange pigment: DPP Orange PO73; High weather-resistant yellow pigment: Titanium nickel yellow; Synergistic halogen-free flame retardant powder: aluminum diethylphosphinate and melamine cyanurate are mixed at a ratio of 2:1; Anti-photoaging agent: UV-234 and Tiangang®HS-300 are compounded in a 1:1 ratio; Antioxidant: Irganox 1098 and ADKSTABPEP-36 were combined in a ratio of 1:1.25; Compatibilizer: Maleic anhydride grafted with POE (POE-g-MAH); Processing lubricants: polyamide wax, oxidized polyethylene wax; Processing heat stabilizer: Irganox 1098 and Irganox 168 are compounded in a 1:1 ratio (effective concentration of masterbatch 15%). Table 1: Final formulation composition of nylon corrugated pipes in Examples 1-8 and Comparative Examples 1-3 (by weight of each component in the final product)

[0025] Among them, Comparative Examples 1, 2, and 3 are comparative schemes that omit the integrated weather-resistant synergistic additive, the anti-exudation flame-retardant masterbatch, and the weather-resistant color masterbatch, respectively, to verify the synergistic effect of the three components.

[0026] Preparation Example 1: Preparation of Weather-Resistant Masterbatch In Preparation Example 1, the formulation of the weather-resistant masterbatch was as follows: 12.0 parts DPP orange PO73, 14.0 parts titanium nickel yellow, 0.03 parts carbon black, 1.5 parts titanium dioxide, 0.5 parts polyamide wax, 1.0 part processing heat stabilizer, 10 parts PA powder, and 60.97 parts PA raw material resin (B40). The PA resin was vacuum dried at 120°C for 4 hours, and all pigments were dried at 80°C for 4 hours. Using a high-speed mixer, the PA powder, titanium dioxide, and carbon black were mixed for 2 minutes, and then the orange and yellow pigments were added, with a total mixing time of 15 minutes, during which polyamide wax was added in small amounts several times. The mixture was melt-extruded through a co-rotating twin-screw extruder (L / D≥44:1), with the following temperature settings: Zone 1 210°C, Zone 2 230°C, Zone 3 240°C, Zone 4 255°C, Zone 5 to the die head 265°C (melt temperature 265°C), screw speed 400 rpm, and two-stage vacuum exhaust after the melting section. After the extruded strip is cooled, it is cut into pellets and dried at 100°C for 3 hours to obtain weather-resistant masterbatch.

[0027] Preparation Example 2: Preparation of Anti-precipitation Flame Retardant Masterbatch In Preparation Example 2, the formulation of the anti-precipitation flame retardant masterbatch was as follows: 50.0 parts of synergistic halogen-free flame retardant powder (aluminum diethylphosphinate:MCA = 2:1), 0.15 parts of oxidized polyethylene wax, 3.0 parts of POE-g-MAH, 1.0 part of processing heat stabilizer, and 45.85 parts of PA powder. The PA powder was dried at 100°C for 4 hours, and the flame retardant was dried at 80°C for 3 hours. All components were mixed at high speed for 20 minutes. The mixture was melt-extruded using a co-rotating twin-screw extruder with a feed zone temperature of 220°C, a homogenization zone temperature of 250°C, and a die head temperature of 230°C. After water ring pelletizing, centrifugal drying, and dehumidification drying, the anti-precipitation flame retardant masterbatch was obtained.

[0028] Preparation Example 3: Preparation of Integrated Weather-Resistant Synergistic Additive In Preparation Example 3, the formulation of the integrated weather-resistant synergist was as follows: 7.5 parts UV-234, 7.5 parts Tiangang® HS-300, 8.33 parts Irganox 1098, 6.67 parts ADKSTABPEP-36, 0.1 parts oxidized polyethylene wax, and 69.9 parts PA raw material resin (B40). The PA resin was vacuum dried at 120°C for 4 hours, and all powders were dried at 80°C for 4 hours. All components were mixed at high speed at 70°C for 15 minutes. The mixture was melt-extruded using a co-rotating twin-screw extruder at 240°C in zone 1, 250°C in zone 2, 260°C in zone 3, 265°C at the die head, and a screw speed of 350 rpm. The extruded strip was cooled and pelletized to obtain the integrated weather-resistant synergist.

[0029] Preparation of bellows in Examples 1-8 and Comparative Examples 1-3 According to the formulation in Table 1, the corresponding weight parts of PA raw material resin (B40), weather-resistant masterbatch (obtained in Preparation Example 1), anti-exudation flame-retardant masterbatch (obtained in Preparation Example 2), and integrated weather-resistant synergist (obtained in Preparation Example 3) were weighed. The mixture was dried in an oven at 120°C for 2 hours, and then mixed at high speed at 80°C for 22 minutes. The uniform premix was fed into a single-screw extruder for melt extrusion, molding, and winding to obtain an orange halogen-free flame-retardant nylon corrugated pipe. The extrusion temperature was set as follows: 230°C in the feed zone, 250°C in the homogenization zone, and 260°C in the die zone. In the preparation of Comparative Examples 1-3, except that the formulation was adjusted according to Table 1, the weather-resistant masterbatch, anti-exudation flame-retardant masterbatch, and integrated weather-resistant synergist were prepared according to the methods of Preparation Examples 1, 2, and 3, respectively.

[0030] Performance Tests and Results The performance of the corrugated pipe samples prepared in the above embodiments and comparative examples was tested, and the results are summarized in Table 2.

[0031] 1. Flame retardant performance: The flame retardant rating of a 0.8mm thick sample was tested according to UL94 standard.

[0032] 2. Xenon lamp aging test: Perform cycle 1 of method A according to GB / T16422.2-2022 for a total time of 1000 hours. After the test, observe the surface condition, evaluate the gray scale grade (assess the degree of discoloration) according to GB / T250-2008, and test the tensile strength retention rate.

[0033] 3. Thermal aging test: Refer to QC / T29106-2014, conduct 500 hours of thermal aging at 150℃, and test the retention rate of tensile strength.

[0034] Note: The gray card grade is determined according to GB / T250-2008 "Textiles - Tests for Color Fastness - Evaluation of Color Change Gray Scale". 'XY grade' indicates that the degree of color change is between grade X and grade Y.

[0035] Table 2: Performance Test Results of Examples and Comparative Examples

[0036] Results analysis: 1. The key role of the integrated weather-resistant synergist: As seen in Comparative Examples 1-3, with the increase of the amount of this synergist from 2 parts to 6 parts, the tensile strength retention rate after xenon lamp aging significantly increased from 52% to 85%, and the strength retention rate after heat aging also increased from 50% to 84%, while maintaining excellent color (level 4-5). The results of Comparative Example 1 (without synergist) are the most convincing: although the initial flame retardancy was V-0, the flame retardancy performance dropped to V-2 after aging, the mechanical properties were almost lost (retention rate of only 9%), and the color deteriorated severely (level 1-2), proving that this synergist is the core of the material's long-term outdoor durability.

[0037] 2. Necessity and Optimal Range of Anti-Exudation Flame Retardant Masterbatch: When the content of anti-exudation flame retardant masterbatch reaches or exceeds 23.0 parts (Examples 1, 2, 3, 5, 8), the product can stably maintain V-0 flame retardant performance before and after xenon lamp aging. In particular, when the dosage is within the preferred range of 23.0-28.0 parts (Examples 2, 3, 5, 8), it maintains V-0 flame retardancy while also exhibiting good mechanical property retention and color stability. When the dosage is 18.0-23.0 parts, it can still maintain effective flame retardant performance (e.g., V-2 level), which is suitable for applications with slightly lower flame retardant requirements but still requiring outdoor weather resistance. As the test results show, when the dosage is 18.0 parts (Examples 4, 7), the flame retardant level is V-2, indicating that although this dosage can provide some flame retardancy, it does not reach the optimal level. Comparative Example 2 (without flame retardant masterbatch) only achieved a flame retardant rating of HB, demonstrating that anti-exudation flame retardant masterbatch is indispensable for achieving basic safety requirements. Overall, an anti-exudation flame retardant masterbatch dosage of 23.0-28.0 parts is the preferred range for achieving and maintaining a high V-0 flame retardant rating over the long term.

[0038] 3. Contribution of weather-resistant masterbatch: The gray scale grade of Comparative Example 3 (without masterbatch) is 3-4, which is lower than that of all examples with added masterbatch (all 4-5). This indicates that the specially formulated weather-resistant masterbatch has a positive effect on maintaining the long-term outdoor color stability of the product. Furthermore, considering the performance data trends of Examples 1-8 (2.0 parts and 4.0 parts) and Comparative Example 3 (0 parts), those skilled in the art can reasonably expect that when the amount of weather-resistant masterbatch is 1.0-2.0 parts, its contribution to the color stability of the product will be significantly better than that of Comparative Example 3, and the basic objective of this invention can be achieved.

[0039] 4. Overall Performance Balance: Example 3 (6 parts additives, 23 parts flame retardant, 2 parts color masterbatch) demonstrates the optimal overall performance balance: maintaining V-0 flame retardancy before and after aging, while exhibiting extremely high strength retention (85%) and excellent color retention (4-5 levels). Other examples show that by adjusting the proportions of the three components, a balance can be achieved between flame retardancy rating, mechanical properties, cost, and color depth to suit different application priorities.

[0040] In summary, this invention, through the synergistic effect of weather-resistant masterbatch, anti-exudation flame-retardant masterbatch, and integrated weather-resistant synergistic additive, successfully prepared an orange halogen-free flame-retardant nylon corrugated pipe that maintains excellent flame-retardant performance, mechanical properties, and color stability even after long-term xenon lamp aging, perfectly solving the technical problems mentioned in the background art.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A xenon lamp aging-resistant, orange halogen-free flame-retardant nylon corrugated pipe, characterized in that, Made from the following ingredients in parts by weight: Polyamide (PA) raw material resin 62-79 parts; Weather-resistant masterbatch: 1.0-4.0 parts; 18.0-28.0 parts of anti-exudation flame retardant masterbatch; Integrated weather-resistant synergistic agent 2.0-6.0 parts.

2. The xenon lamp aging resistant orange halogen-free flame-retardant nylon corrugated pipe according to claim 1, characterized in that, The amount of the weather-resistant masterbatch is 2.0-4.0 parts; the amount of the anti-expansion flame-retardant masterbatch is 23.0-28.0 parts.

3. The xenon lamp aging resistant orange halogen-free flame-retardant nylon corrugated pipe according to claim 1, characterized in that, The weather-resistant masterbatch is made from components comprising the following parts by weight: High weather-resistant orange pigment, 8.0-15.0 parts; High weather-resistant yellow pigment, 10.0-18.0 parts; Carbon black 0-0.1 parts; Titanium dioxide 0-3.5 parts; Processing lubricant 0.5-1.4 parts; Processing heat stabilizer 0.5-1.0 parts; 10-15 parts PA powder; 46-71 parts of PA raw material resin.

4. The xenon lamp aging resistant orange halogen-free flame-retardant nylon corrugated pipe according to claim 3, characterized in that, The high weather-resistant orange pigment is selected from at least one of pyrrolopyrroledione, benzimidazolone, or isoindolineone orange pigments; the high weather-resistant yellow pigment is selected from at least one of titanium nickel yellow, bismuth vanadate yellow, benzimidazolone, or isoindolineone yellow pigments.

5. The xenon lamp aging-resistant orange halogen-free flame-retardant nylon corrugated pipe according to claim 1, characterized in that, The anti-exudation flame retardant masterbatch is made from components comprising the following parts by weight: Synergistic halogen-free flame retardant powder, 40.0-50.0 parts; Processing lubricant 0-0.3 parts; Compatibilizer 0-3.0 parts; Processing heat stabilizer 0.5-1.0 parts; PA powder 45.7-59.5 parts; The synergistic halogen-free flame retardant powder is composed of a metal phosphonate and a nitrogen-containing flame retardant synergist mixed in a weight ratio of 2:1 to 3:

1. The metal phosphonate is a dialkyl phosphonate; the nitrogen-containing flame retardant synergist is melamine cyanurate or melamine pyrophosphate; and the compatibilizer is at least one of maleic anhydride-grafted polyolefin elastomer, maleic anhydride-grafted polyethylene, or organosilicon compatibilizer.

6. The xenon lamp aging-resistant orange halogen-free flame-retardant nylon corrugated pipe according to claim 1, characterized in that, The integrated weather-resistant synergist is made from components comprising the following parts by weight: Anti-photoaging agent 10.0-20.0 parts; Antioxidant 10.0-20.0 parts; Processing lubricant 0-0.3 parts; PA raw material resin 59.7-80.0 parts; The anti-photoaging agent is composed of a UV absorber and a hindered amine light stabilizer in a weight ratio of 1:1 to 1:1.2; the antioxidant is composed of a hindered phenolic primary antioxidant and a phosphite secondary antioxidant in a weight ratio of 1:1 to 1:

2.

7. The xenon lamp aging-resistant orange halogen-free flame-retardant nylon corrugated pipe according to claim 6, characterized in that, The hindered amine light stabilizer is a non-alkaline or low-alkaline hindered amine light stabilizer.

8. A method for preparing a xenon lamp aging-resistant orange halogen-free flame-retardant nylon corrugated pipe as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. Preparation of weather-resistant masterbatch: By weight, 8.0-15.0 parts of high weather-resistant orange pigment, 10.0-18.0 parts of high weather-resistant yellow pigment, 0-0.1 parts of carbon black, 0-3.5 parts of titanium dioxide, 0.5-1.4 parts of processing lubricant, 0.5-1.0 parts of processing heat stabilizer, 10-15 parts of PA powder and 46-71 parts of PA raw material resin are mixed and the weather-resistant masterbatch is prepared by melt extrusion granulation process; S2. Preparation of anti-expansion flame retardant masterbatch: By weight, 40.0-50.0 parts of synergistic halogen-free flame retardant powder, 0-0.3 parts of processing lubricant, 0-3.0 parts of compatibilizer, 0.5-1.0 parts of processing heat stabilizer and 45.7-59.5 parts of PA powder are mixed and the anti-expansion flame retardant masterbatch is prepared by melt extrusion granulation process; S3. Preparation of integrated weather-resistant synergistic agent: By weight, 10.0-20.0 parts of anti-photoaging agent, 10.0-20.0 parts of antioxidant, 0-0.3 parts of processing lubricant and 59.7-80.0 parts of PA raw material resin are mixed and the integrated weather-resistant synergistic agent is prepared by melt extrusion granulation process; S4. Preparation of the final corrugated pipe: By weight, 62-79 parts of polyamide (PA) raw resin, 1.0-4.0 parts of the weather-resistant masterbatch obtained in step S1, 18.0-28.0 parts of the anti-expiration flame-retardant masterbatch obtained in step S2, and 2.0-6.0 parts of the integrated weather-resistant synergist obtained in step S3 are mixed, dried, melt-extruded and wound through a screw extruder to obtain the xenon lamp aging resistant orange halogen-free flame-retardant nylon corrugated pipe.

9. The method for preparing a xenon lamp aging-resistant orange halogen-free flame-retardant nylon corrugated pipe according to claim 8, characterized in that, In step S1, the melt temperature of the melt extrusion is controlled at 265℃-275℃; in step S2, the die temperature of the melt extrusion is 225℃-235℃; in step S4, the die temperature of the melt extrusion is 265℃-275℃.

10. The application of the xenon lamp aging resistant orange halogen-free flame-retardant nylon corrugated pipe according to any one of claims 1-7 in cable protection for rail transit, new energy equipment, outdoor engineering machinery or high-end home appliances.

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