Marine material compression-resistant long-term high-temperature-resistant pipeline based on PP-RCT and preparation method

Abstract

The invention discloses a marine material compression-resistant long-term high-temperature-resistant pipeline based on PP-RCT and a preparation method, and the marine material compression-resistant long-term high-temperature-resistant pipeline based on PP-RCT comprises the following components in percentage by mass: 70-85% of PP-RCT matrix resin particles, 5-10% of PP-RCT matrix resin particles, 5-10% of PP-RCT matrix resin particles, 5-10% of PP-RCT matrix resin particles, 5-10 3-6% of silane coupling agent modified graphene; 5 to 15% of silane coupling agent modified glass fiber; 5 to 10% of nano silicon dioxide; 1-3% of nano boron carbide; 1-3% of calcium stearate; 0.5 to 1.5 percent of an antioxidant 1010; 1 to 4% of hyperbranched polysiloxane; 2-5% of a phosphate flame retardant; 0.5-2% of a heat stabilizer; 0.5-2% of a lubricant; by introducing the nano silicon dioxide, the nano boron carbide and the silane coupling agent to modify the glass fiber, the compressive strength of the pipeline is improved, and the pipeline can bear higher working pressure.

Description

Technical Field

[0001] The present invention belongs to the technical field of marine pipes, and specifically relates to a marine material pressure-resistant, long-term high-temperature resistant pipe based on PP-RCT and a preparation method thereof. Background Art

[0002] In the shipbuilding industry, piping systems are used to transport various fluid media, such as cooling water, fuel, lubricating oil, etc. These pipes need to have good pressure resistance, high temperature resistance and corrosion resistance to ensure the safe operation of the ship. Traditional marine piping materials such as ordinary PP-R (random copolymer polypropylene) have certain corrosion resistance and good processing properties, but their performance in high temperature and high pressure environments is limited. In recent years, PP-RCT (impact-resistant copolymer polypropylene) materials have gradually attracted attention due to their excellent impact resistance and heat resistance. However, the performance of existing PP-RCT materials under long-term high temperature and high pressure conditions still needs to be further improved, especially in complex working conditions such as ships. Therefore, it is of great significance to develop a marine material-based PP-RCT-resistant, long-term high temperature resistant pipeline.

[0003] Based on this, a PP-RCT-based marine material pressure-resistant, long-term high-temperature resistant pipeline and its preparation method were designed. Summary of the Invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a marine material pressure-resistant, long-term high-temperature resistant pipeline based on PP-RCT and a preparation method, which effectively solves the problems raised in the above background.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a PP-RCT-based marine material pressure-resistant, long-term high-temperature resistant pipeline, comprising the following components in percentage by mass:

[0006] PP-RCT matrix resin particles: 70-85%;

[0007] Silane coupling agent modified graphene: 3-6%;

[0008] Silane coupling agent modified glass fiber: 5-15%;

[0009] Nano-silicon dioxide: 5-10%;

[0010] Nano boron carbide: 1-3%;

[0011] Calcium stearate: 1-3%;

[0012] Antioxidant 1010: 0.5-1.5%;

[0013] Hyperbranched polysiloxane: 1-4%;

[0014] Phosphate flame retardant: 2-5%;

[0015] Heat stabilizer: 0.5-2%;

[0016] Lubricant: 0.5-2%.

[0017] Preferably, the phosphate flame retardant is triphenyl phosphate.

[0018] Preferably, the preparation method of the silane coupling agent modified graphene is as follows:

[0019] S1. Pretreatment of graphene: dispersing graphene in deionized water to form a graphene aqueous dispersion with a concentration of 1-2 g / L;

[0020] The dispersion is placed in an ultrasonic cleaning apparatus and ultrasonically treated for 30-60 minutes at an ultrasonic power of 300-500 W and a frequency of 20-40 kHz to remove impurities on the graphene surface and fully disperse the graphene;

[0021] S2. Grafting of silane coupling agent: Transfer the pretreated graphene aqueous dispersion to a reactor, add 1-3% by mass of silane coupling agent KH551, and stir the reaction at 60-80°C for 2-4 hours at a stirring speed of 300-500 r / min;

[0022] After the reaction is completed, the reaction product is washed with deionized water for multiple times to remove unreacted silane coupling agent, and then dried at 80-100° C. for 12-24 hours to obtain silane coupling agent-modified graphene.

[0023] Preferably, the preparation method of the silane coupling agent modified glass fiber is as follows:

[0024] S1. Surface treatment of glass fiber: Soak the glass fiber in a 5% sodium hydroxide solution for 10-15 minutes, then rinse with deionized water until neutral, and dry for later use;

[0025] S2. Silane coupling agent treatment: Place the treated glass fiber into an ethanol solution containing 3-5% silane coupling agent KH551, stir evenly, at a temperature of 40-50°C, a stirring speed of 100-150 r / min, and a treatment time of 2-3 hours;

[0026] S3. Drying and curing: Take out the treated glass fiber, place it in an oven at 80-100° C. for drying for 2-3 hours, and then cure it at 120-150° C. for 1-2 hours to obtain silane coupling agent modified glass fiber.

[0027] Preferably, the surface modification method of the nano-silica is as follows:

[0028] S1. Dispersion treatment: Add nano-silicon dioxide with a particle size of 20-50 nm to deionized water and disperse it by ultrasonication for 30-60 minutes at an ultrasonic power of 300-500 W and a frequency of 20-40 kHz;

[0029] S2. Surface modification: adding 1-2% by mass of silane coupling agent KH570, continuing ultrasonic dispersion for 10-20 minutes, and then drying at 60-80° C. for 2-3 hours to obtain surface-modified nano-silica.

[0030] Preferably, the preparation method of the hyperbranched polysiloxane is as follows:

[0031] S1. Monomer synthesis: γ-aminopropylmethyldiethoxysilane and γ-methacryloxypropyltrimethoxysilane were mixed in a molar ratio of 1:1, added to a three-necked flask filled with dry tetrahydrofuran under dry nitrogen protection, and stirred at 0-5°C to mix evenly;

[0032] S2, initiating polymerization: adding azobisisobutyronitrile as an initiator to the above mixed solution, the amount of azobisisobutyronitrile is 0.5-1% of the total mass of the monomers, after the addition is complete, stirring and reacting at 60-70° C. for 6-8 hours to carry out a free radical polymerization reaction;

[0033] S3. Termination of reaction and purification: After the reaction is completed, the reaction solution is poured into methanol for precipitation, and the precipitate is obtained by filtration. The precipitate is washed with methanol for multiple times, and then vacuum-dried at 50-60° C. for 12-24 hours to obtain hyperbranched polysiloxane.

[0034] A method for preparing a PP-RCT-based marine material pressure-resistant, long-term, high-temperature resistant pipeline comprises the following steps:

[0035] S1. Raw material mixing: Add PP-RCT matrix resin particles, silane coupling agent modified graphene, silane coupling agent modified glass fiber, nano-silica, nano-boron carbide, calcium stearate, antioxidant 1010, hyperbranched polysiloxane, phosphate flame retardant, heat stabilizer, and lubricant into a high-speed mixer in the above proportions, control the mixing temperature to 60-80°C, the mixing speed to 800-1200 r / min, and the mixing time to 20-30 minutes to ensure that all ingredients are fully mixed;

[0036] S2, extrusion molding: the pre-mixed raw materials are added to a twin-screw extruder for melt blending. The temperature of each zone of the twin-screw extruder is set as follows: the temperature of zone 1 is 180-200°C, the temperature of zone 2 is 200-220°C, the temperature of zone 3 is 220-240°C, the temperature of zone 4 is 230-250°C, the temperature of zone 5 is 240-260°C, and the head temperature is 250-270°C;

[0037] The screw speed is controlled at 300-400 r / min and the extrusion pressure is 10-15 MPa, and the raw materials are melted and extruded into a pipe through the extruder;

[0038] S3. Cooling and shaping: The extruded pipe is cooled and shaped by a water-cooling shaping device. The water temperature is controlled at 10-20°C and the cooling rate is 0.5-1.0m / min to ensure the stability of the pipe size.

[0039] S5: Post-processing: Cut the pipe after cooling and shaping, and the cutting length is determined according to actual needs;

[0040] Grind the pipe surface to remove burrs and impurities to ensure a smooth surface;

[0041] The qualified pipes are then packaged and stored in a dry, ventilated environment away from direct sunlight.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] 1. The present invention improves the compressive strength of the pipeline by introducing nano-silicon dioxide, nano-boron carbide and silane coupling agent to modify the glass fiber, so that the pipeline can withstand higher working pressure;

[0044] 2. PP-RCT itself has high heat resistance. The addition of hyperbranched polysiloxane further enhances the high-temperature resistance and antioxidant properties of the pipeline, allowing it to be used for a long time in high-temperature environments without performance degradation. At the same time, the silane coupling agent-modified graphene further enhances the mechanical properties and thermal conductivity of the pipeline. The synergistic effect of nano-silica and boron carbide significantly improves the long-term high-temperature resistance of the pipeline, thus giving the pipeline excellent high-temperature resistance.

[0045] 3. PP-RCT itself has good corrosion resistance, combined with the surface modification of nano-silicon dioxide, it further enhances the chemical corrosion resistance of the pipeline. DETAILED DESCRIPTION

[0046] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0047] The present invention provides a PP-RCT-based marine material pressure-resistant, long-term high-temperature resistant pipeline, comprising the following components in percentage by mass:

[0048] PP-RCT matrix resin particles: 70-85%;

[0049] Silane coupling agent modified graphene: 3-6%;

[0050] Silane coupling agent modified glass fiber: 5-15%;

[0051] Nano-silicon dioxide: 5-10%;

[0052] Nano boron carbide: 1-3%;

[0053] Calcium stearate: 1-3%;

[0054] Antioxidant 1010: 0.5-1.5%;

[0055] Hyperbranched polysiloxane: 1-4%;

[0056] Phosphate flame retardant: 2-5%;

[0057] Heat stabilizer: 0.5-2%;

[0058] Lubricant: 0.5-2%.

[0059] The phosphate flame retardant in this embodiment is triphenyl phosphate.

[0060] The preparation method of the silane coupling agent modified graphene of this embodiment is as follows:

[0061] S1. Pretreatment of graphene: dispersing graphene in deionized water to form a graphene aqueous dispersion with a concentration of 1-2 g / L;

[0062] The dispersion is placed in an ultrasonic cleaning apparatus and ultrasonically treated for 30-60 minutes at an ultrasonic power of 300-500 W and a frequency of 20-40 kHz to remove impurities on the graphene surface and fully disperse the graphene;

[0063] S2. Grafting of silane coupling agent: Transfer the pretreated graphene aqueous dispersion to a reactor, add 1-3% by mass of silane coupling agent KH551, and stir the reaction at 60-80°C for 2-4 hours at a stirring speed of 300-500 r / min;

[0064] After the reaction is completed, the reaction product is washed with deionized water for multiple times to remove unreacted silane coupling agent, and then dried at 80-100° C. for 12-24 hours to obtain silane coupling agent-modified graphene.

[0065] The preparation method of the silane coupling agent modified glass fiber of this embodiment is as follows:

[0066] S1. Surface treatment of glass fiber: Soak the glass fiber in a 5% sodium hydroxide solution for 10-15 minutes, then rinse with deionized water until neutral, and dry for later use;

[0067] S2. Silane coupling agent treatment: Place the treated glass fiber into an ethanol solution containing 3-5% silane coupling agent KH551, stir evenly, at a temperature of 40-50°C, a stirring speed of 100-150 r / min, and a treatment time of 2-3 hours;

[0068] S3. Drying and curing: Take out the treated glass fiber, place it in an oven at 80-100° C. for drying for 2-3 hours, and then cure it at 120-150° C. for 1-2 hours to obtain silane coupling agent modified glass fiber.

[0069] The surface modification method of the nano-silicon dioxide of this embodiment is as follows:

[0070] S1. Dispersion treatment: Add nano-silicon dioxide with a particle size of 20-50 nm to deionized water and disperse it by ultrasonication for 30-60 minutes at an ultrasonic power of 300-500 W and a frequency of 20-40 kHz;

[0071] S2. Surface modification: adding 1-2% by mass of silane coupling agent KH570, continuing ultrasonic dispersion for 10-20 minutes, and then drying at 60-80° C. for 2-3 hours to obtain surface-modified nano-silica.

[0072] The preparation method of the hyperbranched polysiloxane of the present embodiment is as follows:

[0073] S1. Monomer synthesis: γ-aminopropylmethyldiethoxysilane and γ-methacryloxypropyltrimethoxysilane were mixed in a molar ratio of 1:1, added to a three-necked flask filled with dry tetrahydrofuran under dry nitrogen protection, and stirred at 0-5°C to mix evenly;

[0074] S2, initiating polymerization: adding azobisisobutyronitrile as an initiator to the above mixed solution, the amount of azobisisobutyronitrile is 0.5-1% of the total mass of the monomers, after the addition is complete, stirring and reacting at 60-70° C. for 6-8 hours to carry out a free radical polymerization reaction;

[0075] S3. Termination of reaction and purification: After the reaction is completed, the reaction solution is poured into methanol for precipitation, and the precipitate is obtained by filtration. The precipitate is washed with methanol for multiple times, and then vacuum-dried at 50-60° C. for 12-24 hours to obtain hyperbranched polysiloxane.

[0076] A method for preparing a PP-RCT-based marine material pressure-resistant, long-term, high-temperature resistant pipeline comprises the following steps:

[0077] S1. Raw material mixing: Add PP-RCT matrix resin particles, silane coupling agent modified graphene, silane coupling agent modified glass fiber, nano-silica, nano-boron carbide, calcium stearate, antioxidant 1010, hyperbranched polysiloxane, phosphate flame retardant, heat stabilizer, and lubricant into a high-speed mixer in the above proportions, control the mixing temperature to 60-80°C, the mixing speed to 800-1200 r / min, and the mixing time to 20-30 minutes to ensure that all ingredients are fully mixed;

[0078] S2, extrusion molding: the pre-mixed raw materials are added to a twin-screw extruder for melt blending. The temperature of each zone of the twin-screw extruder is set as follows: the temperature of zone 1 is 180-200°C, the temperature of zone 2 is 200-220°C, the temperature of zone 3 is 220-240°C, the temperature of zone 4 is 230-250°C, the temperature of zone 5 is 240-260°C, and the head temperature is 250-270°C;

[0079] The screw speed is controlled at 300-400 r / min and the extrusion pressure is 10-15 MPa, and the raw materials are melted and extruded into a pipe through the extruder;

[0080] S3. Cooling and shaping: The extruded pipe is cooled and shaped by a water-cooling shaping device. The water temperature is controlled at 10-20°C and the cooling rate is 0.5-1.0m / min to ensure the stability of the pipe size.

[0081] S5: Post-processing: Cut the pipe after cooling and shaping, and the cutting length is determined according to actual needs;

[0082] Grind the pipe surface to remove burrs and impurities to ensure a smooth surface;

[0083] The qualified pipes are then packaged and stored in a dry, ventilated environment away from direct sunlight.

[0084] Example 1:

[0085] A PP-RCT-based marine material pressure-resistant, long-term high-temperature resistant pipe includes the following components in percentage by mass:

[0086] PP-RCT matrix resin particles: 70%;

[0087] Silane coupling agent modified graphene: 3%;

[0088] Silane coupling agent modified glass fiber: 5%;

[0089] Nano-silicon dioxide: 5%;

[0090] Nano boron carbide: 1%;

[0091] Calcium stearate: 1%;

[0092] Antioxidant 1010: 0.5%;

[0093] Hyperbranched polysiloxane: 1%;

[0094] Phosphate flame retardant: 2%;

[0095] Heat stabilizer: 0.5%;

[0096] Lubricant: 0.5%.

[0097] The phosphate flame retardant in this embodiment is triphenyl phosphate.

[0098] The preparation method of the silane coupling agent modified graphene of this embodiment is as follows:

[0099] S1. Pretreatment of graphene: dispersing graphene in deionized water to form a graphene aqueous dispersion with a concentration of 1 g / L;

[0100] The dispersion was placed in an ultrasonic cleaning apparatus and ultrasonicated for 30 minutes at a power of 300 W and a frequency of 20 kHz to remove impurities on the graphene surface and fully disperse it.

[0101] S2. Grafting of silane coupling agent: The pretreated graphene aqueous dispersion was transferred to a reactor, 1% by mass of silane coupling agent KH551 was added, and the mixture was stirred at 60°C for 2 hours at a stirring speed of 300 r / min.

[0102] After the reaction is completed, the reaction product is washed with deionized water several times to remove unreacted silane coupling agent, and then dried at 80° C. for 12 hours to obtain silane coupling agent-modified graphene.

[0103] The preparation method of the silane coupling agent modified glass fiber of this embodiment is as follows:

[0104] S1. Surface treatment of glass fiber: soak the glass fiber in a 5% sodium hydroxide solution for 10 minutes, then rinse with deionized water until neutral, and dry for later use;

[0105] S2. Silane coupling agent treatment: Place the treated glass fiber into an ethanol solution containing 3% silane coupling agent KH551, stir evenly, at a temperature of 40°C, a stirring speed of 100 r / min, and a treatment time of 2 hours;

[0106] S3. Drying and curing: The treated glass fiber was taken out and placed in an oven at 80° C. for 2 hours, and then cured at 120° C. for 1 hour to obtain a silane coupling agent-modified glass fiber.

[0107] The surface modification method of the nano-silicon dioxide of this embodiment is as follows:

[0108] S1, dispersion treatment: add nano-silicon dioxide with a particle size of 20 nm into deionized water and disperse it by ultrasonication for 30 minutes at an ultrasonic power of 300 W and a frequency of 20 kHz;

[0109] S2. Surface modification: adding 1-2% by mass of silane coupling agent KH570, continuing ultrasonic dispersion for 10 minutes, and then drying at 60° C. for 2 hours to obtain surface-modified nano-silica.

[0110] The preparation method of the hyperbranched polysiloxane of the present embodiment is as follows:

[0111] S1. Monomer synthesis: γ-aminopropylmethyldiethoxysilane and γ-methacryloxypropyltrimethoxysilane were mixed in a molar ratio of 1:1, added to a three-necked flask filled with dry tetrahydrofuran under dry nitrogen protection, and stirred at 0°C to mix thoroughly;

[0112] S2, initiating polymerization: adding azobisisobutyronitrile as an initiator to the above mixed solution, the amount of azobisisobutyronitrile being 0.5% of the total weight of the monomers, and stirring the reaction at 60° C. for 6 hours to carry out a free radical polymerization reaction;

[0113] S3. Termination of reaction and purification: After the reaction is completed, the reaction solution is poured into methanol for precipitation, and the precipitate is filtered and washed with methanol for multiple times, and then vacuum-dried at 50° C. for 12 hours to obtain hyperbranched polysiloxane.

[0114] A method for preparing a PP-RCT-based marine material pressure-resistant, long-term, high-temperature resistant pipeline comprises the following steps:

[0115] S1. Raw material mixing: Add PP-RCT matrix resin particles, silane coupling agent modified graphene, silane coupling agent modified glass fiber, nano-silica, nano-boron carbide, calcium stearate, antioxidant 1010, hyperbranched polysiloxane, phosphate flame retardant, heat stabilizer, and lubricant into a high-speed mixer in the above proportions, control the mixing temperature to 60°C, the mixing speed to 800 r / min, and the mixing time to 20 minutes to ensure that all ingredients are fully mixed;

[0116] S2, extrusion molding: the pre-mixed raw materials were added to a twin-screw extruder for melt blending. The temperature of each zone of the twin-screw extruder was set as follows: the temperature of zone 1 was 180°C, the temperature of zone 2 was 200°C, the temperature of zone 3 was 220°C, the temperature of zone 4 was 230°C, the temperature of zone 5 was 240°C, and the head temperature was 250°C.

[0117] The screw speed is controlled at 300 r / min and the extrusion pressure is 10 MPa, and the raw materials are melted and extruded into a pipe through the extruder;

[0118] S3. Cooling and shaping: The extruded pipe is cooled and shaped by a water-cooling shaping device. The water temperature is controlled at 10°C and the cooling speed is 0.5m / min to ensure the stability of the pipe size.

[0119] S5: Post-processing: Cut the pipe after cooling and shaping, and the cutting length is determined according to actual needs;

[0120] Grind the pipe surface to remove burrs and impurities to ensure a smooth surface;

[0121] The qualified pipes are then packaged and stored in a dry, ventilated environment away from direct sunlight.

[0122] Example 2:

[0123] A PP-RCT-based marine material pressure-resistant, long-term high-temperature resistant pipe includes the following components in percentage by mass:

[0124] PP-RCT matrix resin particles: 85%;

[0125] Silane coupling agent modified graphene: 6%;

[0126] Silane coupling agent modified glass fiber: 15%;

[0127] Nano-silicon dioxide: 10%;

[0128] Nano boron carbide: 3%;

[0129] Calcium stearate: 3%;

[0130] Antioxidant 1010: 1.5%;

[0131] Hyperbranched polysiloxane: 4%;

[0132] Phosphate flame retardant: 5%;

[0133] Heat stabilizer: 2%;

[0134] Lubricant: 2%.

[0135] The phosphate flame retardant in this embodiment is triphenyl phosphate.

[0136] The preparation method of the silane coupling agent modified graphene of this embodiment is as follows:

[0137] S1. Pretreatment of graphene: dispersing graphene in deionized water to form a graphene aqueous dispersion with a concentration of 2 g / L;

[0138] The dispersion was placed in an ultrasonic cleaning apparatus and ultrasonically treated for 60 minutes at an ultrasonic power of 500 W and a frequency of 40 kHz to remove impurities on the graphene surface and fully disperse it;

[0139] S2. Grafting of silane coupling agent: The pretreated graphene aqueous dispersion was transferred to a reactor, 3% by mass of silane coupling agent KH551 was added, and the mixture was stirred at 80°C for 4 hours at a stirring speed of 500 r / min;

[0140] After the reaction is completed, the reaction product is washed with deionized water several times to remove unreacted silane coupling agent, and then dried at 100° C. for 24 hours to obtain silane coupling agent-modified graphene.

[0141] The preparation method of the silane coupling agent modified glass fiber of this embodiment is as follows:

[0142] S1. Surface treatment of glass fiber: soak the glass fiber in a 5% sodium hydroxide solution for 15 minutes, then rinse with deionized water until neutral, and dry for later use;

[0143] S2. Silane coupling agent treatment: Place the treated glass fiber into an ethanol solution containing 5% silane coupling agent KH551, stir evenly, at a temperature of 50°C, a stirring speed of 150 r / min, and a treatment time of 3 hours;

[0144] S3. Drying and curing: The treated glass fiber is taken out and placed in an oven at 100° C. for drying for 3 hours, and then cured at 150° C. for 2 hours to obtain a silane coupling agent-modified glass fiber.

[0145] The surface modification method of the nano-silicon dioxide of this embodiment is as follows:

[0146] S1. Dispersion treatment: Add nano-silica with a particle size of 50 nm into deionized water and disperse it by ultrasonication for 60 minutes at an ultrasonic power of 500 W and a frequency of 40 kHz.

[0147] S2. Surface modification: adding 2% by mass of silane coupling agent KH570, continuing ultrasonic dispersion for 20 minutes, and then drying at 80° C. for 3 hours to obtain surface-modified nano-silica.

[0148] The preparation method of the hyperbranched polysiloxane of the present embodiment is as follows:

[0149] S1. Monomer synthesis: γ-aminopropylmethyldiethoxysilane and γ-methacryloxypropyltrimethoxysilane were mixed in a molar ratio of 1:1, added to a three-necked flask filled with dry tetrahydrofuran under dry nitrogen protection, and stirred at 5°C to mix thoroughly;

[0150] S2, initiating polymerization: adding azobisisobutyronitrile as an initiator to the above mixed solution, the amount of azobisisobutyronitrile being 1% of the total weight of the monomers, and stirring the reaction at 70° C. for 8 hours to carry out a free radical polymerization reaction;

[0151] S3. Termination of reaction and purification: After the reaction is completed, the reaction solution is poured into methanol for precipitation, and the precipitate is filtered and washed with methanol for multiple times, and then vacuum-dried at 60° C. for 24 hours to obtain hyperbranched polysiloxane.

[0152] A method for preparing a PP-RCT-based marine material pressure-resistant, long-term, high-temperature resistant pipeline comprises the following steps:

[0153] S1. Raw material mixing: Add PP-RCT matrix resin particles, silane coupling agent modified graphene, silane coupling agent modified glass fiber, nano-silica, nano-boron carbide, calcium stearate, antioxidant 1010, hyperbranched polysiloxane, phosphate flame retardant, heat stabilizer, and lubricant into a high-speed mixer in the above proportions, control the mixing temperature to 80°C, the mixing speed to 1200 r / min, and the mixing time to 30 minutes to ensure that all ingredients are fully mixed;

[0154] S2, extrusion molding: the pre-mixed raw materials were added to a twin-screw extruder for melt blending. The temperature of each zone of the twin-screw extruder was set as follows: the temperature of zone 1 was 200°C, the temperature of zone 2 was 220°C, the temperature of zone 3 was 240°C, the temperature of zone 4 was 250°C, the temperature of zone 5 was 260°C, and the head temperature was 270°C.

[0155] The screw speed is controlled at 400 r / min and the extrusion pressure is 15 MPa, and the raw materials are melted and extruded into a pipe through the extruder;

[0156] S3. Cooling and shaping: The extruded pipe is cooled and shaped by a water-cooling shaping device. The water temperature is controlled at 20°C and the cooling rate is 1.0 m / min to ensure the stability of the pipe size.

[0157] S5: Post-processing: Cut the pipe after cooling and shaping, and the cutting length is determined according to actual needs;

[0158] Grind the pipe surface to remove burrs and impurities to ensure a smooth surface;

[0159] The qualified pipes are then packaged and stored in a dry, ventilated environment away from direct sunlight.

[0160] Example 3:

[0161] A PP-RCT-based marine material pressure-resistant, long-term high-temperature resistant pipe includes the following components in percentage by mass:

[0162] PP-RCT matrix resin particles: 77.5%;

[0163] Silane coupling agent modified graphene: 4.5%;

[0164] Silane coupling agent modified glass fiber: 10%;

[0165] Nano-silicon dioxide: 7.5%;

[0166] Nano boron carbide: 2%;

[0167] Calcium stearate: 2%;

[0168] Antioxidant 1010: 1%;

[0169] Hyperbranched polysiloxane: 2.5%;

[0170] Phosphate flame retardant: 3.5%;

[0171] Heat stabilizer: 1.3%;

[0172] Lubricant: 1.3%.

[0173] The phosphate flame retardant in this embodiment is triphenyl phosphate.

[0174] The preparation method of the silane coupling agent modified graphene of this embodiment is as follows:

[0175] S1. Pretreatment of graphene: dispersing graphene in deionized water to form a graphene aqueous dispersion with a concentration of 1.5 g / L;

[0176] The dispersion was placed in an ultrasonic cleaner and ultrasonicated for 45 minutes at a power of 400 W and a frequency of 30 kHz to remove impurities on the graphene surface and fully disperse it.

[0177] S2. Grafting of silane coupling agent: The pretreated graphene aqueous dispersion was transferred to a reactor, 2% by mass of silane coupling agent KH551 was added, and the mixture was stirred at 70°C for 3 hours at a stirring speed of 400 r / min.

[0178] After the reaction is completed, the reaction product is washed with deionized water several times to remove unreacted silane coupling agent, and then dried at 90° C. for 18 hours to obtain silane coupling agent-modified graphene.

[0179] The preparation method of the silane coupling agent modified glass fiber of this embodiment is as follows:

[0180] S1. Surface treatment of glass fiber: soak the glass fiber in a 5% sodium hydroxide solution for 12.5 minutes, then rinse with deionized water until neutral, and dry for later use;

[0181] S2. Silane coupling agent treatment: Place the treated glass fiber into an ethanol solution containing 4% silane coupling agent KH551, stir evenly, at a temperature of 45°C, a stirring speed of 125 r / min, and a treatment time of 2.5 hours;

[0182] S3. Drying and curing: The treated glass fiber was taken out and placed in an oven at 90° C. for 2.5 hours, and then cured at 135° C. for 1.5 hours to obtain a silane coupling agent-modified glass fiber.

[0183] The surface modification method of the nano-silicon dioxide of this embodiment is as follows:

[0184] S1. Dispersion treatment: Add nano-silica with a particle size of 35 nm into deionized water and disperse it by ultrasonication for 45 minutes at an ultrasonic power of 400 W and a frequency of 30 kHz.

[0185] S2. Surface modification: adding 1.5% by mass of silane coupling agent KH570, continuing ultrasonic dispersion for 15 minutes, and then drying at 70° C. for 2.5 hours to obtain surface-modified nano-silica.

[0186] The preparation method of the hyperbranched polysiloxane of the present embodiment is as follows:

[0187] S1. Monomer synthesis: γ-aminopropylmethyldiethoxysilane and γ-methacryloxypropyltrimethoxysilane were mixed in a molar ratio of 1:1, added to a three-necked flask filled with dry tetrahydrofuran under dry nitrogen protection, and stirred at 2.5°C until uniformly mixed;

[0188] S2, initiating polymerization: adding azobisisobutyronitrile as an initiator to the above mixed solution, the amount of azobisisobutyronitrile is 0.8% of the total weight of the monomers, and stirring the mixture at 65° C. for 7 hours to carry out a free radical polymerization reaction;

[0189] S3. Termination of reaction and purification: After the reaction is completed, the reaction solution is poured into methanol for precipitation, and the precipitate is filtered and washed with methanol for multiple times, and then vacuum-dried at 55° C. for 18 hours to obtain hyperbranched polysiloxane.

[0190] A method for preparing a PP-RCT-based marine material pressure-resistant, long-term, high-temperature resistant pipeline comprises the following steps:

[0191] S1. Raw material mixing: Add PP-RCT matrix resin particles, silane coupling agent modified graphene, silane coupling agent modified glass fiber, nano-silica, nano-boron carbide, calcium stearate, antioxidant 1010, hyperbranched polysiloxane, phosphate flame retardant, heat stabilizer, and lubricant into a high-speed mixer in the above proportions, control the mixing temperature to 70°C, the mixing speed to 1000 r / min, and the mixing time to 25 minutes to ensure that all ingredients are fully mixed;

[0192] S2, extrusion molding: the pre-mixed raw materials were added to a twin-screw extruder for melt blending. The temperature of each zone of the twin-screw extruder was set as follows: the temperature of zone 1 was 190°C, the temperature of zone 2 was 210°C, the temperature of zone 3 was 230°C, the temperature of zone 4 was 240°C, the temperature of zone 5 was 250°C, and the head temperature was 260°C.

[0193] The screw speed is controlled at 350 r / min and the extrusion pressure is 12.5 MPa, and the raw materials are melted and extruded into a pipe through the extruder;

[0194] S3. Cooling and shaping: The extruded pipe is cooled and shaped by a water-cooling shaping device. The water temperature is controlled at 15°C and the cooling rate is 0.8m / min to ensure the stability of the pipe size.

[0195] S5: Post-processing: Cut the pipe after cooling and shaping, and the cutting length is determined according to actual needs;

[0196] Grind the pipe surface to remove burrs and impurities to ensure a smooth surface;

[0197] The qualified pipes are then packaged and stored in a dry, ventilated environment away from direct sunlight.

[0198] Example 4:

[0199] A PP-RCT-based marine material pressure-resistant, long-term high-temperature resistant pipe includes the following components in percentage by mass:

[0200] PP-RCT matrix resin particles: 75%;

[0201] Silane coupling agent modified graphene: 4%;

[0202] Silane coupling agent modified glass fiber: 7%;

[0203] Nano-silicon dioxide: 6%;

[0204] Nano boron carbide: 1.5%;

[0205] Calcium stearate: 1.5%;

[0206] Antioxidant 1010: 0.7%;

[0207] Hyperbranched polysiloxane: 2%;

[0208] Phosphate flame retardant: 3%;

[0209] Heat stabilizer: 0.7%;

[0210] Lubricant: 0.7%.

[0211] The phosphate flame retardant in this embodiment is triphenyl phosphate.

[0212] The preparation method of the silane coupling agent modified graphene of this embodiment is as follows:

[0213] S1. Pretreatment of graphene: dispersing graphene in deionized water to form a graphene aqueous dispersion with a concentration of 1 g / L;

[0214] The dispersion was placed in an ultrasonic cleaning apparatus and ultrasonicated for 35 minutes at a power of 350 W and a frequency of 25 kHz to remove impurities on the graphene surface and fully disperse it.

[0215] S2. Grafting of silane coupling agent: The pretreated graphene aqueous dispersion was transferred to a reactor, 1.5% by mass of silane coupling agent KH551 was added, and the mixture was stirred at 65°C for 2.5 hours at a stirring speed of 350 r / min.

[0216] After the reaction, the reaction product was washed with deionized water several times to remove unreacted silane coupling agent, and then dried at 85° C. for 14 hours to obtain silane coupling agent-modified graphene.

[0217] The preparation method of the silane coupling agent modified glass fiber of this embodiment is as follows:

[0218] S1. Surface treatment of glass fiber: soak the glass fiber in a 5% sodium hydroxide solution for 11 minutes, then rinse with deionized water until neutral, and dry for later use;

[0219] S2. Silane coupling agent treatment: Place the treated glass fiber into an ethanol solution containing 3.5% silane coupling agent KH551, stir evenly, at a temperature of 42°C, a stirring speed of 110 r / min, and a treatment time of 2.2 hours;

[0220] S3. Drying and curing: The treated glass fiber was taken out and placed in an oven at 85° C. for 2.2 hours, and then cured at 125° C. for 1.2 hours to obtain a silane coupling agent-modified glass fiber.

[0221] The surface modification method of the nano-silicon dioxide of this embodiment is as follows:

[0222] S1, dispersion treatment: add nano-silica with a particle size of 25 nm into deionized water and disperse it by ultrasonication for 35 minutes at an ultrasonic power of 350 W and a frequency of 25 kHz;

[0223] S2. Surface modification: adding 1.2% by mass of silane coupling agent KH570, continuing ultrasonic dispersion for 12 minutes, and then drying at 65° C. for 2.2 hours to obtain surface-modified nano-silica.

[0224] The preparation method of the hyperbranched polysiloxane of the present embodiment is as follows:

[0225] S1. Monomer synthesis: γ-aminopropylmethyldiethoxysilane and γ-methacryloxypropyltrimethoxysilane were mixed in a molar ratio of 1:1, added to a three-necked flask filled with dry tetrahydrofuran under dry nitrogen protection, and stirred at 1°C until uniformly mixed;

[0226] S2, initiating polymerization: adding azobisisobutyronitrile as an initiator to the above mixed solution, the amount of azobisisobutyronitrile being 0.6% of the total weight of the monomers, and stirring the reaction at 61° C. for 6.5 hours to carry out a free radical polymerization reaction;

[0227] S3. Termination of reaction and purification: After the reaction is completed, the reaction solution is poured into methanol for precipitation, and the precipitate is filtered and washed with methanol for multiple times, and then vacuum-dried at 52° C. for 14 hours to obtain hyperbranched polysiloxane.

[0228] A method for preparing a PP-RCT-based marine material pressure-resistant, long-term, high-temperature resistant pipeline comprises the following steps:

[0229] S1. Raw material mixing: Add PP-RCT matrix resin particles, silane coupling agent modified graphene, silane coupling agent modified glass fiber, nano-silica, nano-boron carbide, calcium stearate, antioxidant 1010, hyperbranched polysiloxane, phosphate flame retardant, heat stabilizer, and lubricant in the above proportions into a high-speed mixer, control the mixing temperature to 62°C, the mixing speed to 900 r / min, and the mixing time to 22 minutes to ensure that all ingredients are fully mixed;

[0230] S2, extrusion molding: the pre-mixed raw materials were added to a twin-screw extruder for melt blending. The temperature of each zone of the twin-screw extruder was set as follows: the temperature of zone 1 was 185°C, the temperature of zone 2 was 205°C, the temperature of zone 3 was 225°C, the temperature of zone 4 was 235°C, the temperature of zone 5 was 245°C, and the head temperature was 255°C.

[0231] The screw speed is controlled at 320 r / min and the extrusion pressure is 12 MPa, and the raw materials are melted and extruded into a pipe through the extruder;

[0232] S3. Cooling and shaping: The extruded pipe is cooled and shaped by a water-cooling shaping device. The water temperature is controlled at 12°C and the cooling rate is 0.6m / min to ensure the stability of the pipe size.

[0233] S5: Post-processing: Cut the pipe after cooling and shaping, and the cutting length is determined according to actual needs;

[0234] Grind the pipe surface to remove burrs and impurities to ensure a smooth surface;

[0235] The qualified pipes are then packaged and stored in a dry, ventilated environment away from direct sunlight.

[0236] The marine material pressure-resistant, long-term high-temperature resistant pipeline based on PP-RCT prepared in the above embodiment has the following properties:

[0237]

[0238]

[0239] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0240] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A marine material pressure-resistant, long-term high-temperature resistant pipeline based on PP-RCT, characterized by: The following ingredients are included in percentage by mass: PP-RCT matrix resin particles: 70-85%; Silane coupling agent modified graphene: 3-6%; Silane coupling agent modified glass fiber: 5-15%; Nano-silicon dioxide: 5-10%; Nano boron carbide: 1-3%; Calcium stearate: 1-3%; Antioxidant 1010: 0.5-1.5%; Hyperbranched polysiloxane: 1-4%; Phosphate flame retardant: 2-5%; Heat stabilizer: 0.5-2%; Lubricant: 0.5-2%.

2. The PP-RCT marine material pressure-resistant, long-term high-temperature resistant pipeline according to claim 1 is characterized in that: The phosphate flame retardant is triphenyl phosphate.

3. The PP-RCT marine material pressure-resistant, long-term high-temperature resistant pipeline according to claim 1, characterized in that: The preparation method of the silane coupling agent modified graphene is as follows: S1. Pretreatment of graphene: dispersing graphene in deionized water to form a graphene aqueous dispersion with a concentration of 1-2 g / L; The dispersion is placed in an ultrasonic cleaning apparatus and ultrasonically treated for 30-60 minutes at an ultrasonic power of 300-500 W and a frequency of 20-40 kHz to remove impurities on the graphene surface and fully disperse the graphene; S2. Grafting of silane coupling agent: Transfer the pretreated graphene aqueous dispersion to a reactor, add 1-3% by mass of silane coupling agent KH551, and stir the reaction at 60-80°C for 2-4 hours at a stirring speed of 300-500 r / min; After the reaction is completed, the reaction product is washed with deionized water for multiple times to remove unreacted silane coupling agent, and then dried at 80-100° C. for 12-24 hours to obtain silane coupling agent-modified graphene.

4. The PP-RCT marine material pressure-resistant, long-term high-temperature resistant pipeline according to claim 1, characterized in that: The preparation method of the silane coupling agent modified glass fiber is as follows: S1. Surface treatment of glass fiber: Soak the glass fiber in a 5% sodium hydroxide solution for 10-15 minutes, then rinse with deionized water until neutral, and dry for later use; S2. Silane coupling agent treatment: Place the treated glass fiber into an ethanol solution containing 3-5% silane coupling agent KH551, stir evenly, at a temperature of 40-50°C, a stirring speed of 100-150 r / min, and a treatment time of 2-3 hours; S3. Drying and curing: Take out the treated glass fiber, place it in an oven at 80-100° C. for drying for 2-3 hours, and then cure it at 120-150° C. for 1-2 hours to obtain silane coupling agent modified glass fiber.

5. The PP-RCT-based marine material pressure-resistant, long-term high-temperature resistant pipeline according to claim 1, characterized in that: The surface modification method of the nano-silicon dioxide is as follows: S1. Dispersion treatment: Add nano-silicon dioxide with a particle size of 20-50 nm to deionized water and disperse it by ultrasonication for 30-60 minutes at an ultrasonic power of 300-500 W and a frequency of 20-40 kHz; S2. Surface modification: adding 1-2% by mass of silane coupling agent KH570, continuing ultrasonic dispersion for 10-20 minutes, and then drying at 60-80° C. for 2-3 hours to obtain surface-modified nano-silica.

6. The PP-RCT-based marine material pressure-resistant, long-term high-temperature resistant pipeline according to claim 1, characterized in that: The preparation method of the hyperbranched polysiloxane is as follows: S1. Monomer synthesis: γ-aminopropylmethyldiethoxysilane and γ-methacryloxypropyltrimethoxysilane were mixed in a molar ratio of 1:1, added to a three-necked flask filled with dry tetrahydrofuran under dry nitrogen protection, and stirred at 0-5°C to mix evenly; S2, initiating polymerization: adding azobisisobutyronitrile as an initiator to the above mixed solution, the amount of azobisisobutyronitrile is 0.5-1% of the total mass of the monomers, after the addition is complete, stirring and reacting at 60-70° C. for 6-8 hours to carry out a free radical polymerization reaction; S3. Termination of reaction and purification: After the reaction is completed, the reaction solution is poured into methanol for precipitation, and the precipitate is obtained by filtration. The precipitate is washed with methanol for multiple times, and then vacuum-dried at 50-60° C. for 12-24 hours to obtain hyperbranched polysiloxane.

7. A method for preparing a long-term high-temperature resistant pressure-resistant marine material pipeline based on PP-RCT, characterized in that: The following steps are involved: S1. Raw material mixing: Add PP-RCT matrix resin particles, silane coupling agent modified graphene, silane coupling agent modified glass fiber, nano-silica, nano-boron carbide, calcium stearate, antioxidant 1010, hyperbranched polysiloxane, phosphate flame retardant, heat stabilizer, and lubricant into a high-speed mixer in the above proportions, control the mixing temperature to 60-80°C, the mixing speed to 800-1200 r / min, and the mixing time to 20-30 minutes to ensure that all ingredients are fully mixed; S2, extrusion molding: the pre-mixed raw materials are added to a twin-screw extruder for melt blending. The temperature of each zone of the twin-screw extruder is set as follows: the temperature of zone 1 is 180-200°C, the temperature of zone 2 is 200-220°C, the temperature of zone 3 is 220-240°C, the temperature of zone 4 is 230-250°C, the temperature of zone 5 is 240-260°C, and the head temperature is 250-270°C; The screw speed is controlled at 300-400 r / min and the extrusion pressure is 10-15 MPa, and the raw materials are melted and extruded into a pipe through the extruder; S3. Cooling and shaping: The extruded pipe is cooled and shaped by a water-cooling shaping device. The water temperature is controlled at 10-20°C and the cooling rate is 0.5-1.0m / min to ensure the stability of the pipe size. S5: Post-processing: Cut the pipe after cooling and shaping, and the cutting length is determined according to actual needs; Grind the pipe surface to remove burrs and impurities to ensure a smooth surface; The qualified pipes are then packaged and stored in a dry, ventilated environment away from direct sunlight.

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