Plateau anti-ultraviolet PE100RC special pipeline
Through three-layer structure design and co-extrusion technology, the problems of insufficient UV protection, poor low-temperature toughness and low process stability of PE100RC pipes in plateau environments have been solved. Excellent UV shielding performance, outstanding low-temperature impact resistance and high interlayer bonding strength have been achieved, and the ring stiffness and hydraulic strength of the pipe have been improved.
Patent Information
- Application Number
- CN202510841784.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-23
- Publication Date
- 2025-09-23
AI Technical Summary
The existing PE100RC pipeline has problems such as insufficient UV protection, poor low-temperature toughness and low process stability in plateau environments.
It adopts a three-layer structural design. The lining layer is composed of PE100RC resin and hindered amine light stabilizer, the reinforcement layer is composed of PE100RC resin, recycled PE particles and surface-grafted polyimide fiber, and the anti-UV layer is composed of high-pressure polyethylene, conductive carbon black, anthocyanin and titanium dioxide. Special plateau anti-UV PE100RC pipes are prepared by co-extrusion technology.
It achieves excellent UV shielding performance, outstanding low-temperature impact resistance, good material recycling performance and high interlayer bonding strength, improves the ring stiffness and hydraulic strength of the pipeline, and solves the problem of use in plateau environments.
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of polyethylene pipes, in particular to a special plateau UV-resistant PE100RC pipe. Background Art
[0002] The existing PE100RC pipeline has three major defects in plateau environments:
[0003] Insufficient UV protection: Conventional carbon black shielding systems are not effective in strong UV rays (>600kJ / m 2 ) aging is accelerated, and anthocyanin additives are easily photodegraded and ineffective;
[0004] Poor low-temperature toughness: The temperature difference between day and night causes stress accumulation in the pipeline, and the toughening efficiency of POE toughening agent drops sharply below -30℃;
[0005] Low process stability: The coupling agent is unevenly dispersed during high mixing, and high-temperature extrusion causes thermal oxidative degradation of HDPE. Summary of the Invention
[0006] The technical problem to be solved by the present invention is to provide a special plateau UV-resistant PE100RC pipe, which can enhance the plateau UV protection, improve the low-temperature toughness and strengthen the process stability.
[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a three-layer structure from the inside to the outside:
[0008] Lining layer: 40% of the thickness, made of PE100RC resin as the matrix, with 0.3-0.5 parts of hindered amine light stabilizer (HALS) added;
[0009] Reinforcement layer: 50% thick, composed of PE100RC resin and 5-8 parts of recycled PE particles (activated by aluminate) as the matrix, 2-3 parts of polyimide fiber with surface grafted -CO-NH- bonds as the reinforcement phase, and POE-g-MAH as the compatibilizer;
[0010] Anti-ultraviolet layer: The thickness accounts for 10%, and it is made of high-pressure polyethylene (melt flow rate 2g / 10min) as the matrix, with 2.0-3.0 parts of conductive carbon black (acetylene black), 0.5-1.0 parts of anthocyanin Cyanine2 and 0.4 parts of titanium dioxide added as functional agents.
[0011] Preferably, in the anti-ultraviolet layer, the conductive carbon black is acetylene black with a particle size of ≤50 nm, and the mass ratio of anthocyanin to hindered amine light stabilizer is 1.5-3:1.
[0012] Preferably, the reinforcement layer contains 5-8 parts of recycled PE particles, and the surface of the recycled PE particles is coated with an aluminate coupling agent film layer.
[0013] Preferably, the grafting rate of the surface-grafted polyimide fiber is 1.2-1.8%, and the grafting group is —CO—NH—.
[0014] The beneficial effects of the present invention are:
[0015] 1. By adding a composite formula of conductive carbon black, anthocyanin Cyanine2 and titanium dioxide to the anti-UV layer, excellent UV shielding performance is achieved, which is far superior to the effect of a single UV shielding agent in the existing technology;
[0016] 2. By adding polyimide fibers with surface-grafted -CO-NH- bonds as a reinforcement phase in the reinforcement layer, excellent low-temperature impact resistance is achieved. The tube showed no damage in a -40°C drop hammer impact test, while the single-layer tube showed 100% damage.
[0017] 3. The interlayer bonding strength is improved by reacting the -CO-NH- grafted groups on the surface of polyimide fibers with POE-g-MAH, and the crack propagation energy reaches 158 J / m 2 , effectively solved the problem of interlayer separation;
[0018] 4. Through the rational design of the three-layer structure, the ring stiffness of the pipeline is improved to ≥8kN / m 2 , while ensuring good hydraulic strength, 20℃ / 50 years predicted strength ≥12.4MPa;
[0019] 5. By using recycled PE particles activated by aluminate in the reinforcement layer, good material recycling performance is achieved. After aluminate coating, the compatibility difference with the original resin is ≤5%;
[0020] 6. Through the interlayer functional decoupling design, the problem of functional additives migrating inwards and causing the performance degradation of the core mechanical layer is avoided, so that each layer of material can fully exert its specific function. DETAILED DESCRIPTION
[0021] To explain the technical content, achieved objectives and effects of the present invention in detail, the following describes them in conjunction with the implementation methods.
[0022] The technical solution adopted by the present invention to solve the technical problem is: to provide a plateau UV-resistant PE100RC special pipe, which is characterized by comprising a three-layer structure from the inside to the outside:
[0023] Example 1
[0024] A special plateau UV-resistant PE100RC pipe, which includes an inner lining layer, a reinforcement layer and an anti-UV layer from the inside to the outside.
[0025] The inner lining layer is composed of PE100RC resin and hindered amine light stabilizer. PE100RC resin is a high-density polyethylene material with excellent stress cracking resistance and is particularly suitable for use in complex environments in plateau areas. In this embodiment, the PE100RC resin is selected with a density of 0.958g / cm 3 The material is a high-density polyethylene with a melt index of 0.25g / 10min. A 2,2,6,6-tetramethylpiperidine derivative is used as a hindered amine light stabilizer, added at a level of 0.5% by weight of the PE100RC resin. This hindered amine light stabilizer effectively captures free radicals, blocking the photooxidative degradation chain reaction and improving the aging resistance of the inner liner.
[0026] The reinforcement layer is composed of PE100RC resin, recycled PE particles, maleic anhydride-grafted POE, and surface-grafted polyimide fibers. The PE100RC resin in the reinforcement layer uses the same specifications as the inner lining to ensure good interlayer bonding. The amount of recycled PE particles added is 6 parts by weight of the PE100RC resin, and the surface of the recycled PE particles is coated with an aluminate coupling agent film. The aluminate coupling agent film has a thickness of 0.01-0.05μm and can improve the compatibility between the recycled PE particles and the matrix resin and improve the interfacial bonding strength. The grafting rate of maleic anhydride-grafted POE is 1.5%, and the addition rate is 3% of the PE100RC resin mass, which is used to enhance the toughness and impact resistance of the material. The grafting rate of the surface-grafted polyimide fiber is 1.5%, the grafting group is -CO-NH-, and the addition rate is 2% of the PE100RC resin mass. The polyimide fiber is 2-5mm in length and 10-15μm in diameter. It has excellent mechanical properties and heat resistance, and can significantly improve the tensile strength and rigidity of the pipeline.
[0027] The anti-ultraviolet layer is composed of high-pressure polyethylene, conductive carbon black, anthocyanin Cyanine2 and titanium dioxide. The high-pressure polyethylene is selected with a density of 0.920g / cm 3 , low-density polyethylene material with a melt index of 1.0g / 10min is used as the base resin. The conductive carbon black is acetylene black with a particle size of 45nm, and the addition amount is 3% of the mass of the high-pressure polyethylene. Acetylene black has excellent conductivity and UV absorption capacity, and can effectively block ultraviolet radiation. The addition amount of anthocyanin Cyanine2 is 1.2% of the mass of the high-pressure polyethylene, and the mass ratio with the hindered amine light stabilizer in the inner lining layer is 2:1. Anthocyanin Cyanine2 is a natural pigment with strong UV absorption ability, especially for strong UV radiation in plateau areas. Titanium dioxide uses rutile titanium dioxide with a particle size of 0.2-0.5μm, and the addition amount is 2% of the mass of the high-pressure polyethylene. It can reflect and scatter ultraviolet rays, further improving the UV resistance of the pipeline.
[0028] Example 2
[0029] A special plateau UV-resistant PE100RC pipe, which includes an inner lining layer, a reinforcement layer and an anti-UV layer from the inside to the outside.
[0030] The inner lining layer is composed of PE100RC resin and hindered amine light stabilizer. The density of PE100RC resin is 0.960g / cm 3 The high-density polyethylene material has a melt index of 0.20g / 10min. The hindered amine light stabilizer is tetramethyl piperidine ether, and the addition amount is 0.6% of the mass of PE100RC resin.
[0031] The reinforcement layer consists of PE100RC resin, recycled PE particles, maleic anhydride-grafted POE, and surface-grafted polyimide fibers. The PE100RC resin in the reinforcement layer uses the same specifications as the inner lining. The recycled PE particles are added in an amount of 5 parts by weight of the PE100RC resin, and the surface of the recycled PE particles is coated with an aluminate coupling agent film. The aluminate coupling agent film thickness is 0.02 μm. The maleic anhydride-grafted POE has a grafting rate of 1.8%, and the added amount is 4% of the PE100RC resin mass. The surface-grafted polyimide fiber has a grafting rate of 1.2%, with the grafted group being -CO-NH-. The added amount is 2.5% of the PE100RC resin mass. The polyimide fiber is 3 mm long and 12 μm in diameter.
[0032] The anti-ultraviolet layer is composed of high-pressure polyethylene, conductive carbon black, anthocyanin Cyanine2 and titanium dioxide. The high-pressure polyethylene is selected with a density of 0.918g / cm 3 The material used is low-density polyethylene (LDPE) with a melt index of 0.8g / 10min. The conductive carbon black is acetylene black with a particle size of 40nm, added at a rate of 3.5% by weight of the high-pressure polyethylene. The anthocyanin Cyanine 2 is added at a rate of 1.5% by weight of the high-pressure polyethylene, with a mass ratio of 2.5:1 to the hindered amine light stabilizer in the liner. The titanium dioxide is rutile titanium dioxide with a particle size of 0.3μm, added at a rate of 2.5% by weight of the high-pressure polyethylene.
[0033] Example 3
[0034] A special plateau UV-resistant PE100RC pipe, which includes an inner lining layer, a reinforcement layer and an anti-UV layer from the inside to the outside.
[0035] The inner lining layer is composed of PE100RC resin and hindered amine light stabilizer. The density of PE100RC resin is 0.955g / cm 3 The high-density polyethylene material has a melt index of 0.30g / 10min. The hindered amine light stabilizer is tetramethylpiperidinyl ester, and the addition amount is 0.4% of the mass of PE100RC resin.
[0036] The reinforcement layer consists of PE100RC resin, recycled PE particles, maleic anhydride-grafted POE, and surface-grafted polyimide fibers. The PE100RC resin in the reinforcement layer uses the same specifications as the inner lining. The recycled PE particles are added in an amount of 8 parts by weight of the PE100RC resin, and the surface of the recycled PE particles is coated with an aluminate coupling agent film. The aluminate coupling agent film thickness is 0.03 μm. The maleic anhydride-grafted POE has a grafting rate of 1.6%, and the added amount is 3.5% of the PE100RC resin mass. The surface-grafted polyimide fiber has a grafting rate of 1.8%, with the grafted group being -CO-NH-. The added amount is 1.8% of the PE100RC resin mass. The polyimide fiber is 4 mm long and 14 μm in diameter.
[0037] The anti-ultraviolet layer is composed of high-pressure polyethylene, conductive carbon black, anthocyanin Cyanine2 and titanium dioxide. The high-pressure polyethylene is selected with a density of 0.922g / cm 3 The material used is low-density polyethylene (LDPE) with a melt index of 1.2 g / 10 min. The conductive carbon black is acetylene black with a particle size of 50 nm, added at a level of 2.8% by weight of the high-pressure polyethylene. The anthocyanin Cyanine 2 is added at a level of 0.9% by weight of the high-pressure polyethylene, with a mass ratio of 2.25:1 to the hindered amine light stabilizer in the inner liner. The titanium dioxide is rutile titanium dioxide with a particle size of 0.4 μm, added at a level of 1.8% by weight of the high-pressure polyethylene.
[0038] Example 4
[0039] A special plateau UV-resistant PE100RC pipe, which includes an inner lining layer, a reinforcement layer and an anti-UV layer from the inside to the outside.
[0040] The inner lining layer is composed of PE100RC resin and hindered amine light stabilizer. The density of PE100RC resin is 0.962g / cm 3 The melt index of the high-density polyethylene material is 0.22g / 10min. The hindered amine light stabilizer is tetramethylpiperidinamine, and the addition amount is 0.7% of the mass of the PE100RC resin.
[0041] The reinforcement layer consists of PE100RC resin, recycled PE particles, maleic anhydride-grafted POE, and surface-grafted polyimide fibers. The PE100RC resin in the reinforcement layer uses the same specifications as the inner lining. The recycled PE particles are added in an amount of 7 parts by weight of the PE100RC resin, and the surface of the recycled PE particles is coated with an aluminate coupling agent film. The aluminate coupling agent film thickness is 0.04 μm. The maleic anhydride-grafted POE has a grafting rate of 1.7%, and the added amount is 4.5% of the PE100RC resin mass. The surface-grafted polyimide fiber has a grafting rate of 1.6%, with the grafted group being -CO-NH-. The added amount is 2.2% of the PE100RC resin mass. The polyimide fiber is 3.5 mm long and 13 μm in diameter.
[0042] The anti-ultraviolet layer is composed of high-pressure polyethylene, conductive carbon black, anthocyanin Cyanine2 and titanium dioxide. The high-pressure polyethylene is selected with a density of 0.925g / cm 3 The material used is low-density polyethylene (LDPE) with a melt index of 1.5g / 10min. The conductive carbon black is acetylene black with a particle size of 35nm, added at a rate of 4% by weight of the high-pressure polyethylene. The anthocyanin Cyanine 2 is added at a rate of 1.8% by weight of the high-pressure polyethylene, with a mass ratio of 2.57:1 to the hindered amine light stabilizer in the inner liner. The titanium dioxide is rutile titanium dioxide with a particle size of 0.25μm, added at a rate of 3% by weight of the high-pressure polyethylene.
[0043] The preparation method of the plateau UV-resistant PE100RC special pipe is as follows:
[0044] First, the inner lining material was prepared by adding PE100RC resin and hindered amine light stabilizer according to the ratio into a high-speed mixer, controlling the mixing temperature at 120°C and mixing for 10 minutes to obtain a uniformly mixed inner lining material.
[0045] Next, the reinforcement layer material was prepared by placing PE100RC resin, recycled PE particles coated with an aluminate coupling agent film, maleic anhydride-grafted POE, and surface-grafted polyimide fibers into a high-speed mixer according to the appropriate ratio. The mixing temperature was controlled at 130°C for 15 minutes to obtain a uniformly mixed reinforcement layer material.
[0046] Then, the anti-ultraviolet layer material was prepared by adding high-pressure polyethylene, conductive carbon black, anthocyanin Cyanine 2 and titanium dioxide into a high-speed mixer according to the proportion, controlling the mixing temperature at 110° C. and mixing time for 12 minutes to obtain a uniformly mixed anti-ultraviolet layer material.
[0047] Finally, a three-layer co-extrusion process was used to produce a special high-altitude UV-resistant PE100RC pipe. The inner lining, reinforcement, and UV-resistant layers were fed separately into the three extruders of the three-layer co-extruder. The inner lining layer was extruded at 210°C, the reinforcement layer at 220°C, and the UV-resistant layer at 200°C. After the three layers were combined in the die, they went through shaping, cooling, pulling, and cutting processes to produce the finished pipe.
[0048] The performance of the pipelines prepared in Examples 1-4 above is as follows:
[0049] Example 1: The resulting high-altitude UV-resistant PE100RC pipe has a 2mm thick inner lining, a 6mm thick reinforcement layer, a 2mm thick UV-resistant layer, and a total wall thickness of 10mm. This pipe exhibits excellent UV resistance, stress cracking resistance, and mechanical properties, making it particularly suitable for use in the complex environments of the plateau. UV aging testing showed no noticeable cracking or discoloration on the pipe surface, maintaining over 90% of its original mechanical properties, even under conditions equivalent to five years of natural aging in the plateau.
[0050] Example 2: The resulting high-altitude UV-resistant PE100RC pipe has a 2.5mm thick inner lining, a 7mm thick reinforcement layer, a 2.5mm thick UV-resistant layer, and a total wall thickness of 12mm. This pipe exhibits excellent UV resistance, stress cracking resistance, and mechanical properties, making it particularly suitable for use in the complex environments of the plateau. UV aging testing showed no noticeable cracking or discoloration on the pipe surface, even under conditions equivalent to six years of natural aging in the plateau, while maintaining over 92% of its original mechanical properties.
[0051] Example 3: The resulting plateau-specific UV-resistant PE100RC pipe has a 1.8mm thick inner lining, a 5.5mm thick reinforcement layer, a 1.8mm thick UV-resistant layer, and a total wall thickness of 9.1mm. This pipe exhibits excellent UV resistance, stress cracking resistance, and mechanical properties, making it particularly suitable for use in the complex environments of the plateau. UV aging testing showed no noticeable cracking or discoloration on the pipe surface, even under conditions equivalent to four years of natural aging in the plateau, while maintaining over 88% of its original mechanical properties.
[0052] Example 4: The resulting plateau-specific UV-resistant PE100RC pipe has a 2.2mm thick lining, a 6.5mm thick reinforcement layer, a 2.2mm thick UV-resistant layer, and a total wall thickness of 10.9mm. This pipe exhibits excellent UV resistance, stress cracking resistance, and mechanical properties, making it particularly suitable for use in the complex environments of the plateau. UV aging testing showed no noticeable cracking or discoloration on the pipe surface, even under conditions equivalent to 5.5 years of natural aging in the plateau, while maintaining over 93% of its original mechanical properties.
[0053] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention specification, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A special plateau UV-resistant PE100RC pipe, characterized in that: From the inside out, it includes: Inner lining: composed of PE100RC resin and hindered amine light stabilizer; Reinforcement layer: composed of PE100RC resin, recycled PE particles, maleic anhydride grafted POE, and surface grafted polyimide fiber; Anti-ultraviolet layer: composed of high-pressure polyethylene, conductive carbon black, anthocyanin Cyanine2, and titanium dioxide.
2. The plateau UV-resistant PE100RC special pipe according to claim 1 is characterized in that: In the anti-ultraviolet layer, the conductive carbon black is acetylene black, the particle size is ≤50nm, and the mass ratio of anthocyanin to hindered amine light stabilizer is 1.5-3:
1.
3. The plateau UV-resistant PE100RC special pipe according to claim 1 is characterized in that: The reinforcing layer contains 5-8 parts of recycled PE particles, and the surface of the recycled PE particles is coated with an aluminate coupling agent film layer.
4. The plateau UV-resistant PE100RC special pipeline according to claim 1 is characterized in that: The grafting rate of the surface-grafted polyimide fiber is 1.2-1.8%, and the grafting group is -CO-NH-.