High-toughness low-temperature-resistant composite material electric pole and preparation method thereof

Abstract

The application relates to the technical field of new materials, and discloses a high-toughness low-temperature-resistant composite material electric pole and a preparation method thereof, wherein the high-toughness low-temperature-resistant composite material electric pole is a segmented pole; the segmented pole comprises two-section poles and three-section poles, and is obtained by sequentially connecting two or three base poles; the base poles are connected in a plug-in mode and are fastened by penetrating screw pins; and the base poles are made of composite glass steel resin materials. The above technical scheme solves the problem that the prepared electric pole is prone to icing in extremely cold weather.

Description

Technical Field

[0001] This invention relates to the field of new materials technology, specifically to a high-toughness, low-temperature resistant composite material pole and its preparation method. Background Technology

[0002] With the continuous improvement of production and life in modern society, the demand for electricity has also increased significantly. Due to the imbalance of power generation areas, it is necessary to transmit electricity from areas with abundant power generation to areas with relatively scarce power generation. With the rapid development of national power construction, the demand for power transmission poles has also increased.

[0003] Currently, large-scale construction of distribution networks and rural power grids is underway in China. During the construction process, cement concrete poles are often used. However, due to the complex terrain and lush vegetation in many mountainous areas, not only is line construction more difficult, but subsequent operation and maintenance are also challenging. Because of the high altitude in mountainous areas, there is a high risk of frequent lightning strikes, which can easily damage the lines and make emergency repairs difficult. To solve these problems, it is necessary to find a new type of pole to replace cement concrete poles.

[0004] The prior art disclosure (announcement) number is CN104150835A: "This invention discloses a concrete pole. The preparation method of the pole includes: crushing slag with a pulverizer, adding barium sulfate, mixing evenly, and grinding to a powder with a particle size of 100 μm, which is material 1; mixing kaolin and diatomaceous earth evenly in a weight ratio of 1:1, adding 5% hydrochloric acid, soaking for 10 min, centrifuging at 500 rpm for 3 min, collecting the precipitate, which is material 2; adding quartz sand, lignite powder and water to a mixer, stirring at 500 rpm for 3 min, which is material 3; adding material 1, material 2, material 3 and 42.5 ordinary silicate cement to the mixer in sequence, stirring until even, and then discharging into a container, which is concrete; pouring concrete into a mold containing a steel mesh, centrifuging to form, and demolding to obtain the concrete pole. The concrete pole of this invention has the advantages of high mechanical strength, low weight and low corrosivity."

[0005] However, concrete poles are mainly made of cement concrete. Due to the materials and processes involved, concrete poles have many disadvantages, such as large weight, low deflection, susceptibility to weathering and cracking, poor corrosion resistance, and short lifespan. Furthermore, the lifespan of concrete poles is generally 15-30 years, with a short replacement cycle, making them unable to support the safety and reliability of the power grid for an extended period.

[0006] Based on this, a high-toughness, low-temperature resistant composite material pole and its preparation method are provided to solve the existing technical problems. Summary of the Invention

[0007] This invention proposes a high-toughness, low-temperature resistant composite material pole and its preparation method, which solves the problem that the poles prepared in related technologies are prone to icing in extreme freezing weather.

[0008] The technical solution of the present invention is as follows: A high-toughness, low-temperature resistant composite material pole, wherein the high-toughness, low-temperature resistant composite material pole is a segmented pole; The segmented rod includes two-section rods and three-section rods, which are formed by connecting two or three base rods in sequence. The base rods are connected by plugging and fastened with through-type screws. The base rods are all made of composite fiberglass resin material.

[0009] As a further technical solution: the method for preparing the composite fiberglass resin material is as follows: (1) Preparation of reinforcing polymer additives; (2) Surface pretreatment of alkali-free glass fiber is performed to obtain pretreated alkali-free glass fiber; (3) After high-temperature melt blending of reinforcing polymer additives and aromatic polyurethane resin for 40-50 min, a composite is obtained; the high-temperature melt temperature is 155℃. (4) The pretreated alkali-free glass fiber, filler and composite obtained are added to the high-pressure stirred reactor in proportion, the temperature is adjusted to 220-230℃, and the reaction is stirred at 500r / min for 50-55min to obtain composite fiberglass resin material.

[0010] As a further technical solution: the method for preparing the reinforcing polymer additive is as follows: First, add styrene into the reactor, introduce inert gas to purge the air from the reactor, then adjust the temperature to 55-60℃ and keep it at that temperature while stirring for 10 minutes. Then, maleic anhydride and dicumyl peroxide are added to dimethyl succinate in sequence and stirred until homogeneous to obtain an intermediate solution. The intermediate liquid prepared above is added dropwise into the reaction vessel and stirred for 2-3 hours to obtain a reaction mixture. The above-obtained reaction mixture was precipitated with an excess of precipitant, then filtered, and dried at 80°C for 1 hour to obtain the precipitated reaction product. Dissolve the precipitate in acetone at a mass ratio of 1:10, then precipitate with an excess of precipitant, filter, and vacuum dry for 4 hours. The vacuum drying temperature is 50℃; The precipitant is methanol.

[0011] As a further technical solution: the inert gas is any one of nitrogen, neon or helium; The mass ratio of styrene to intermediate liquid is 3-5:1; The maleic anhydride and dicumyl peroxide were added sequentially to dimethyl succinate in a mass ratio of 5-8:1:15-18.

[0012] As a further technical solution: the method for preparing the pretreated alkali-free glass fiber is as follows: First, prepare an alcohol-water solution of KH550; Add alkali-free glass fiber to clean water and ultrasonically clean it for 10-12 minutes. Then take it out, dry it, add it to KH550 alcohol-water solution at a mass ratio of 1:8-10, adjust the temperature to 60-65℃, impregnate it under vacuum for 4-5 hours, filter it, and dry it for 2 hours to obtain the treated alkali-free glass fiber. The treated alkali-free glass fiber is evenly dispersed in deionized water, and then the temperature is adjusted to 60-65℃. The mixture is kept warm and stirred for 30 minutes. Then stearic acid and oleic acid are added, and the mixture is kept warm and stirred for 4 hours. Finally, it is ultrasonically treated for 10-15 minutes. After filtration, washing, and drying, it is ready.

[0013] As a further technical solution: the mass ratio of ethanol to water in the KH550 alcohol-water solution is 6:1; The mass fraction of KH550 is 6-7%; The vacuum degree of the vacuum impregnation is 0.1-0.2 Pa; The mass ratio of the treated alkali-free glass fiber, deionized water, stearic acid, and oleic acid is 10-12:35-38:1-1.5:5-6. The ultrasonic power frequency is 40kHz.

[0014] As a further technical solution: the mass fraction of the reinforcing polymer additive in the composite is 5-8%.

[0015] As a further technical solution: the mass ratio of the pretreated alkali-free glass fiber, filler, and composite is 1:0.02:2-3; The filler is carbon nanotubes.

[0016] A method for preparing a high-toughness, low-temperature resistant composite material pole, comprising: First, the composite fiberglass resin material is mixed evenly with a curing agent to form a mixed colloid, and then a rod is formed in one step using a pultrusion process according to the corresponding dimensions. After impregnating alkali-free glass fiber with aliphatic polyurethane resin, the impregnated alkali-free glass fiber is evenly wound onto the surface of the rod using a four-dimensional winding machine. After curing at 85°C, the base rod is obtained. The base rod is then connected into two-section rods and three-section rods by plugging.

[0017] As a further technical solution: the curing agent is diaminodiphenylmethane, and the mass ratio of the curing agent to the composite fiberglass resin material is 1:6.

[0018] This invention primarily involves introducing treated glass fibers into polyurethane resin and blending the two to significantly improve the mechanical and crystallinity properties of the resulting pole material. However, directly blending untreated glass fibers with polyurethane resin results in poor interfacial compatibility, significantly reducing the reinforcing effect and causing the pole's lifespan to fall short of expectations. Therefore, this invention, through specific treatment of the glass fibers, significantly improves their surface properties, enabling effective bonding between the treated glass fibers and polyurethane resin molecules, greatly improving interfacial compatibility, and further enhancing the overall performance of the material.

[0019] The composite material prepared by this invention is a novel type of utility pole. It can be made in two or three sections, and can be adjusted according to the actual application environment. The composite material utility pole made by the process of this invention has many characteristics such as light weight, corrosion resistance, high strength, good insulation performance, and low temperature resistance. It can be widely used in the power field. The composite material utility pole prepared by this invention can be widely promoted and used in mountainous areas with inconvenient transportation, areas with frequent lightning, and areas with frequent typhoons.

[0020] The composite material pole of the present invention has high anti-aging and durability properties, thereby ensuring a long service life.

[0021] In the manufacturing process of the composite material pole of this invention, the introduction of reinforcing polymer additives enables the polyurethane resin to maintain a good state at high or low temperatures. This is mainly achieved by introducing reinforcing polymer additives, which change the aggregated structure, increase the mobility of molecular chains, and improve toughness through the generation of interfacial effects. Furthermore, it reduces the adverse effects of non-crystalline dimethyl alcohols in the polyurethane resin, further enhancing the low-temperature resistance of the composite material. The introduction of reinforcing polymer additives also affects the distribution of polyester polyol chains and isocyanate groups in the polyurethane molecules, increasing their interaction forces and improving the glass transition temperature of the composite material. This results in more stable composite material performance with better low-temperature resistance and high toughness.

[0022] In low-temperature environments, the physical and chemical properties of polyurethane resins are prone to change. Prolonged exposure to low temperatures can gradually increase the brittleness of polyurethane resins. However, the composite material poles prepared by this invention can better resist the problem of weakened molecular chain vibration and torsion caused by low temperatures, thus making the composite material less prone to breakage and enabling it to be used for a long time in low-temperature environments.

[0023] The working principle and beneficial effects of this invention are as follows: 1. The utility pole prepared by this invention has several advantages: good environmental friendliness and a wide application temperature range, enabling long-term use in environments ranging from -70°C to 75°C. This is due to its low coefficient of thermal expansion and high low-temperature resistance, preventing icing in extreme freezing weather and effectively avoiding damage from freeze-thaw cycles that could shorten its lifespan. It also has good wave transmission, allowing electromagnetic waves to pass through, thus preventing crosstalk and shielding of communication base station signals. Furthermore, it aligns with contemporary green environmental protection principles; compared to utility poles made of other materials, its inert material prevents the release of harmful chemicals when in contact with soil and groundwater for extended periods.

[0024] 2. The poles prepared using this invention have a lifespan of over 65 years, with a theoretical maximum lifespan of 80 years. Furthermore, no additional maintenance is required for up to 45 years, significantly reducing maintenance costs and making them more economical. They also possess high corrosion resistance, weather resistance, and high toughness, making them suitable for various complex environments.

[0025] 3. The composite material poles prepared by this invention have high strength and light weight, weighing approximately 1 / 6 of ordinary cement poles, which can effectively improve installation efficiency and reduce labor intensity. Attached Figure Description

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] Figure 1 A bar chart showing the glass transition temperature of the sample in the example; Figure 2 The graph shows the effect of the mass fraction of reinforcing polymer additives in different composites on the impact strength of the pole. Detailed Implementation The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] A high-toughness, low-temperature resistant composite material pole, wherein the high-toughness, low-temperature resistant composite material pole is a segmented pole; The segmented rod includes two-section rods and three-section rods, which are formed by connecting two or three base rods in sequence. The base rods are connected by plugging and fastened with through-type screws. The segmented poles in this invention can be selected according to actual needs. The poles obtained by connecting them with corresponding base poles are suitable for use in mountainous areas where transportation is inconvenient and coastal areas where typhoons are frequent. They mainly rely on their advantages of light weight and high strength to adapt to more complex environments. The bending failure test value is more than 6 times that of ordinary cement concrete, which can provide high typhoon resistance.

[0029] The base rods are all made of composite fiberglass resin material.

[0030] The alkali-free glass fiber is produced by Jiujiang Lianfeng Glass Fiber Co., Ltd. The preparation method of composite fiberglass resin material is as follows: (1) Preparation of reinforcing polymer additives; (2) Surface pretreatment of alkali-free glass fiber is performed to obtain pretreated alkali-free glass fiber; Alkali-free glass fiber with an R2O content of less than 0.8% is an aluminoborosilicate. It exhibits excellent chemical stability, electrical insulation properties, and strength.

[0031] (3) After high-temperature melt blending of reinforcing polymer additives and aromatic polyurethane resin for 40-50 min, a composite is obtained; the high-temperature melt temperature is 155℃. Aromatic polyurethane resin is synthesized from aromatic isocyanate and polyoxypropylene ether triol as raw materials; Aromatic isocyanates include: 2,4'-diphenylmethane diisocyanate, toluene-2,6-diisocyanate, toluene-2,4-diisocyanate, and 4,4'-diphenylmethane diisocyanate; The present invention preferably uses 2,4'-diphenylmethane diisocyanate as a raw material; (4) The pretreated alkali-free glass fiber, filler and composite obtained are added to the high-pressure stirred reactor in proportion, the temperature is adjusted to 220-230℃, and the reaction is stirred at 500r / min for 50-55min to obtain composite fiberglass resin material.

[0032] The preparation method of the reinforcing polymer additive is as follows: First, add styrene into the reactor, introduce inert gas to purge the air from the reactor, then adjust the temperature to 55-60℃ and keep it at that temperature while stirring for 10 minutes. Then, maleic anhydride and dicumyl peroxide are added to dimethyl succinate in sequence and stirred until homogeneous to obtain an intermediate solution. The intermediate liquid prepared above is added dropwise into the reaction vessel and stirred for 2-3 hours to obtain a reaction mixture. The above-obtained reaction mixture was precipitated with an excess of precipitant, then filtered, and dried at 80°C for 1 hour to obtain the precipitated reaction product. Dissolve the precipitate in acetone at a mass ratio of 1:10, then precipitate with an excess of precipitant, filter, and vacuum dry for 4 hours. The vacuum drying temperature is 50℃; The precipitant is methanol.

[0033] The inert gas is any one of nitrogen, neon, or helium; Nitrogen is preferred in this invention; The mass ratio of styrene to intermediate liquid is 3-5:1; The maleic anhydride and dicumyl peroxide were added sequentially to dimethyl succinate in a mass ratio of 5-8:1:15-18.

[0034] Dicumyl peroxide, also known as sulfurizing agent DCP or dicumyl peroxide, is an organic compound with the chemical formula C18H22O2. It is a white crystalline powder that is stable at room temperature and gradually turns slightly yellow upon exposure to light. It is insoluble in water. The preparation method of pretreated alkali-free glass fiber is as follows: First, prepare an alcohol-water solution of KH550; Add alkali-free glass fiber to clean water and ultrasonically clean it for 10-12 minutes. Then take it out, dry it, add it to KH550 alcohol-water solution at a mass ratio of 1:8-10, adjust the temperature to 60-65℃, impregnate it under vacuum for 4-5 hours, filter it, and dry it for 2 hours to obtain the treated alkali-free glass fiber. The treated alkali-free glass fiber is evenly dispersed in deionized water, and then the temperature is adjusted to 60-65℃. The mixture is kept warm and stirred for 30 minutes. Then stearic acid and oleic acid are added, and the mixture is kept warm and stirred for 4 hours. Finally, it is ultrasonically treated for 10-15 minutes. After filtration, washing, and drying, it is ready.

[0035] The mass ratio of ethanol to water in the KH550 aqueous solution is 6:1. The mass fraction of KH550 is 6-7%; The vacuum degree of the vacuum impregnation is 0.1-0.2 Pa; The mass ratio of the treated alkali-free glass fiber, deionized water, stearic acid, and oleic acid is 10-12:35-38:1-1.5:5-6. The ultrasonic power frequency is 40kHz.

[0036] In order to make the composite material have sufficient strength while also having a certain degree of toughness, this invention uses specially treated glass fibers that are rich in hydroxyl groups and other active groups, which are then introduced into polyurethane resin to form stronger chemical bonds. This improves both strength and toughness, so that the composite material poles can be adapted to more complex environments.

[0037] The mass fraction of reinforcing polymer additives in the composite is 5-8%.

[0038] The mass ratio of pretreated alkali-free glass fiber, filler, and composite is 1:0.02:2-3; The filler is carbon nanotubes.

[0039] The curing agent is diaminodiphenylmethane; A method for preparing a high-toughness, low-temperature resistant composite material pole, comprising: First, the composite fiberglass resin material is mixed evenly with a curing agent to form a mixed colloid, and then a rod is formed in one step using a pultrusion process according to the corresponding dimensions. After impregnating alkali-free glass fiber with aliphatic polyurethane resin, the impregnated alkali-free glass fiber is evenly wound onto the surface of the rod using a four-dimensional winding machine. After curing at 85°C, the base rod is obtained. The base rod is then connected into two-section rods and three-section rods by plugging.

[0040] Curing at 85°C can increase the number of crosslinks in the resin, thereby improving the strength and toughness of the composite material.

[0041] Aliphatic polyurethane resins are synthesized from aliphatic isocyanates and polyoxypropylene ether triols. Aliphatic polyurethane resins include isophorone diisocyanate, hexamethylene diisocyanate, and 4,4'-dicyclohexylmethane diisocyanate. The aliphatic polyurethane resin used in this invention is preferably 4,4'-dicyclohexylmethane diisocyanate.

[0042] Table 1 below shows two-section and three-section members: Table 1

[0043] The following are specific examples: Example 1 The base rods in the segmented poles are all made of composite fiberglass resin material.

[0044] The preparation method of composite fiberglass resin material is as follows: (1) Preparation of reinforcing polymer additives; (2) Surface pretreatment of alkali-free glass fiber is performed to obtain pretreated alkali-free glass fiber; (3) The reinforcing polymer additive and aromatic polyurethane resin were melt-blended at high temperature for 40 min to obtain a composite; the high temperature melting temperature was 155℃. (4) The pretreated alkali-free glass fiber, filler and composite prepared are added to the high-pressure stirred reactor in proportion, the temperature is adjusted to 220℃, and the reaction is stirred at 500r / min for 50min to obtain composite fiberglass resin material.

[0045] The preparation method of the reinforcing polymer additive is as follows: First, add styrene into the reactor, introduce nitrogen gas to purge the air from the reactor, then adjust the temperature to 55°C and keep it at that temperature while stirring for 10 minutes. Then, maleic anhydride and dicumyl peroxide are added to dimethyl succinate in sequence and stirred until homogeneous to obtain an intermediate solution. The intermediate liquid prepared above was added dropwise into the reaction vessel and stirred for 2 hours to obtain a reaction mixture. The above-obtained reaction mixture was precipitated with excess methanol, then filtered, and dried at 80°C for 1 hour to obtain the precipitated reaction product. The precipitate was dissolved in acetone at a mass ratio of 1:10, and then precipitated with excess methanol. After filtration, the product was vacuum dried for 4 hours. The vacuum drying temperature is 50℃; The mass ratio of styrene to intermediate liquid is 3:1. The maleic anhydride and dicumyl peroxide were added sequentially to dimethyl succinate in a mass ratio of 5:1:15.

[0046] The preparation method of pretreated alkali-free glass fiber is as follows: First, prepare a 6% (w / w) alcohol-water solution of KH550; the mass ratio of ethanol to water in the KH550 alcohol-water solution is 6:1. Alkali-free glass fiber was ultrasonically cleaned in water for 10 minutes, then removed, dried, and added to an alcohol-water solution of KH550 at a mass ratio of 1:8. The temperature was adjusted to 60°C, and the fiber was impregnated under vacuum for 4 hours. After filtration and drying for 2 hours, the treated alkali-free glass fiber was obtained. The treated alkali-free glass fiber is evenly dispersed in deionized water, then the temperature is adjusted to 60℃ and stirred for 30 minutes. Then stearic acid and oleic acid are added, and the mixture is stirred for 4 hours. Then it is ultrasonically treated for 10 minutes. After filtration, washing and drying, it is ready.

[0047] The vacuum degree of the vacuum impregnation is 0.1 Pa; The mass ratio of the treated alkali-free glass fiber, deionized water, stearic acid, and oleic acid is 10:35:1:5. The ultrasonic power frequency is 40kHz.

[0048] The mass fraction of reinforcing polymer additives in the composite is 6%.

[0049] The mass ratio of pretreated alkali-free glass fiber, carbon nanotubes, and composite is 1:0.02:2; A method for preparing a high-toughness, low-temperature resistant composite material pole, comprising: First, the composite fiberglass resin material is mixed evenly with a curing agent to form a mixed colloid, and then a rod is formed in one step using a pultrusion process according to the corresponding dimensions. After impregnating alkali-free glass fiber with aliphatic polyurethane resin, the impregnated alkali-free glass fiber is evenly wound onto the surface of the rod using a four-dimensional winding machine. After curing at 85°C, the base rod is obtained. The base rod is then connected into two-section rods and three-section rods by interlocking. The curing agent is diaminodiphenylmethane, and the mass ratio of the curing agent to the composite fiberglass resin material is 1:6.

[0050] Example 2 The base rods in the segmented poles are all made of composite fiberglass resin material.

[0051] The preparation method of composite fiberglass resin material is as follows: (1) Preparation of reinforcing polymer additives; (2) Surface pretreatment of alkali-free glass fiber is performed to obtain pretreated alkali-free glass fiber; (3) The reinforcing polymer additive and aromatic polyurethane resin were melt-blended at high temperature for 45 min to obtain a composite; the high temperature melting temperature was 155℃. (4) The pretreated alkali-free glass fiber, filler and composite prepared are added to the high-pressure stirred reactor in proportion, the temperature is adjusted to 222℃, and the reaction is stirred at 500r / min for 55min to obtain composite fiberglass resin material.

[0052] The preparation method of the reinforcing polymer additive is as follows: First, add styrene into the reactor, introduce nitrogen gas to purge the air from the reactor, then adjust the temperature to 58°C and keep it at that temperature while stirring for 10 minutes. Then, maleic anhydride and dicumyl peroxide are added to dimethyl succinate in sequence and stirred until homogeneous to obtain an intermediate solution. The intermediate liquid prepared above was added dropwise into the reaction vessel and stirred for 2.5 hours to obtain a reaction mixture; The above-obtained reaction mixture was precipitated with excess methanol, then filtered, and dried at 80°C for 1 hour to obtain the precipitated reaction product. The precipitate was dissolved in acetone at a mass ratio of 1:10, and then precipitated with excess methanol. After filtration, the product was vacuum dried for 4 hours. The vacuum drying temperature is 50℃; The mass ratio of styrene to intermediate liquid is 4:1. The maleic anhydride and dicumyl peroxide were added sequentially to dimethyl succinate in a mass ratio of 6:1:16.

[0053] The preparation method of pretreated alkali-free glass fiber is as follows: First, prepare a 6.5% KH550 alcohol-water solution; the mass ratio of ethanol to water in the KH550 alcohol-water solution is 6:1. Alkali-free glass fiber was ultrasonically cleaned in water for 11 minutes, then removed, dried, and added to an alcohol-water solution of KH550 at a mass ratio of 1:9. The temperature was adjusted to 62°C, and the fiber was impregnated under vacuum for 4.5 hours. After filtration and drying for 2 hours, the treated alkali-free glass fiber was obtained. The treated alkali-free glass fiber is evenly dispersed in deionized water, then the temperature is adjusted to 62℃ and stirred for 30 minutes. Then stearic acid and oleic acid are added, and the mixture is stirred for 4 hours. Then it is ultrasonically treated for 12 minutes. After filtration, washing and drying, it is ready.

[0054] The vacuum degree of the vacuum impregnation is 0.15 Pa; The mass ratio of the treated alkali-free glass fiber, deionized water, stearic acid, and oleic acid is 11:36:1.2:5.5. The ultrasonic power frequency is 40kHz.

[0055] The mass fraction of reinforcing polymer additives in the composite is 6%.

[0056] The mass ratio of pretreated alkali-free glass fiber, carbon nanotubes, and composite was 1:0.02:2.3. A method for preparing a high-toughness, low-temperature resistant composite material pole, comprising: First, the composite fiberglass resin material is mixed evenly with a curing agent to form a mixed colloid, and then a rod is formed in one step using a pultrusion process according to the corresponding dimensions. After impregnating alkali-free glass fiber with aliphatic polyurethane resin, the impregnated alkali-free glass fiber is evenly wound onto the surface of the rod using a four-dimensional winding machine. After curing at 85°C, the base rod is obtained. The base rod is then connected into two-section rods and three-section rods by interlocking. The curing agent is diaminodiphenylmethane, and the mass ratio of the curing agent to the composite fiberglass resin material is 1:6.

[0057] Example 3 The base rods in the segmented poles are all made of composite fiberglass resin material.

[0058] The preparation method of composite fiberglass resin material is as follows: (1) Preparation of reinforcing polymer additives; (2) Surface pretreatment of alkali-free glass fiber is performed to obtain pretreated alkali-free glass fiber; (3) The reinforcing polymer additive and aromatic polyurethane resin were melt-blended at high temperature for 45 min to obtain a composite; the high temperature melting temperature was 155℃. (4) The pretreated alkali-free glass fiber, filler and composite prepared are added to the high-pressure stirred reactor in proportion, the temperature is adjusted to 226℃, and the reaction is stirred at 500r / min for 50min to obtain composite fiberglass resin material.

[0059] The preparation method of the reinforcing polymer additive is as follows: First, add styrene into the reactor, introduce nitrogen gas to purge the air from the reactor, then adjust the temperature to 58°C and keep it at that temperature while stirring for 10 minutes. Then, maleic anhydride and dicumyl peroxide are added to dimethyl succinate in sequence and stirred until homogeneous to obtain an intermediate solution. The intermediate liquid prepared above was added dropwise into the reaction vessel and stirred for 3 hours to obtain a reaction mixture. The above-obtained reaction mixture was precipitated with excess methanol, then filtered, and dried at 80°C for 1 hour to obtain the precipitated reaction product. The precipitate was dissolved in acetone at a mass ratio of 1:10, and then precipitated with excess methanol. After filtration, the product was vacuum dried for 4 hours. The vacuum drying temperature is 50℃; The mass ratio of styrene to intermediate liquid is 4:1. The maleic anhydride and dicumyl peroxide were added sequentially to dimethyl succinate in a mass ratio of 6:1:18.

[0060] The preparation method of pretreated alkali-free glass fiber is as follows: First, prepare a 6.5% KH550 alcohol-water solution; the mass ratio of ethanol to water in the KH550 alcohol-water solution is 6:1. Alkali-free glass fiber was ultrasonically cleaned in water for 12 minutes, then removed, dried, and added to an alcohol-water solution of KH550 at a mass ratio of 1:9. The temperature was adjusted to 65°C, and the fiber was impregnated under vacuum for 4.5 hours. After filtration and drying for 2 hours, the treated alkali-free glass fiber was obtained. The treated alkali-free glass fiber is evenly dispersed in deionized water, then the temperature is adjusted to 64℃ and stirred for 30 minutes. Then stearic acid and oleic acid are added, and the mixture is stirred for 4 hours. Then it is ultrasonically treated for 12 minutes. After filtration, washing and drying, it is ready.

[0061] The vacuum degree of the vacuum impregnation is 0.18 Pa; The mass ratio of the treated alkali-free glass fiber, deionized water, stearic acid, and oleic acid is 11:35:1.2:5.5. The ultrasonic power frequency is 40kHz.

[0062] The mass fraction of reinforcing polymer additives in the composite is 6%.

[0063] The mass ratio of pretreated alkali-free glass fiber, carbon nanotubes, and composite was 1:0.02:2.5. A method for preparing a high-toughness, low-temperature resistant composite material pole, comprising: First, the composite fiberglass resin material is mixed evenly with a curing agent to form a mixed colloid, and then a rod is formed in one step using a pultrusion process according to the corresponding dimensions. After impregnating alkali-free glass fiber with aliphatic polyurethane resin, the impregnated alkali-free glass fiber is evenly wound onto the surface of the rod using a four-dimensional winding machine. After curing at 85°C, the base rod is obtained. The base rod is then connected into two-section rods and three-section rods by interlocking. The curing agent is diaminodiphenylmethane, and the mass ratio of the curing agent to the composite fiberglass resin material is 1:6.

[0064] Example 4 The base rods in the segmented poles are all made of composite fiberglass resin material.

[0065] The preparation method of composite fiberglass resin material is as follows: (1) Preparation of reinforcing polymer additives; (2) Surface pretreatment of alkali-free glass fiber is performed to obtain pretreated alkali-free glass fiber; (3) The reinforcing polymer additive and aromatic polyurethane resin are melt-blended at high temperature for 50 min to obtain a composite; the high temperature melting temperature is 155℃. (4) The pretreated alkali-free glass fiber, filler and composite obtained are added to the high-pressure stirred reactor in proportion, the temperature is adjusted to 225℃, and the reaction is stirred at 500r / min for 50min to obtain composite fiberglass resin material.

[0066] The preparation method of the reinforcing polymer additive is as follows: First, add styrene into the reactor, introduce nitrogen gas to purge the air from the reactor, then adjust the temperature to 58°C and keep it at that temperature while stirring for 10 minutes. Then, maleic anhydride and dicumyl peroxide are added to dimethyl succinate in sequence and stirred until homogeneous to obtain an intermediate solution. The intermediate liquid prepared above was added dropwise into the reaction vessel and stirred for 2.5 hours to obtain a reaction mixture; The above-obtained reaction mixture was precipitated with excess methanol, then filtered, and dried at 80°C for 1 hour to obtain the precipitated reaction product. The precipitate was dissolved in acetone at a mass ratio of 1:10, and then precipitated with excess methanol. After filtration, the product was vacuum dried for 4 hours. The vacuum drying temperature is 50℃; The mass ratio of styrene to intermediate liquid is 4:1. The maleic anhydride and dicumyl peroxide were added sequentially to dimethyl succinate in a mass ratio of 7:1:16.

[0067] The preparation method of pretreated alkali-free glass fiber is as follows: First, prepare an alcohol-water solution with a mass fraction of 6.2% for KH550; the mass ratio of ethanol to water in the KH550 alcohol-water solution is 6:1. Alkali-free glass fiber was ultrasonically cleaned in water for 11 minutes, then removed, dried, and added to an alcohol-water solution of KH550 at a mass ratio of 1:8. The temperature was adjusted to 60°C, and the fiber was impregnated under vacuum for 5 hours. After filtration and drying for 2 hours, the treated alkali-free glass fiber was obtained. The treated alkali-free glass fiber is evenly dispersed in deionized water, then the temperature is adjusted to 65℃ and stirred for 30 minutes. Then stearic acid and oleic acid are added, and the mixture is stirred for 4 hours. After ultrasonic treatment for 10 minutes, it is filtered, washed, and dried.

[0068] The vacuum degree of the vacuum impregnation is 0.12 Pa; The mass ratio of the treated alkali-free glass fiber, deionized water, stearic acid, and oleic acid is 12:35:1.2:5. The ultrasonic power frequency is 40kHz.

[0069] The mass fraction of reinforcing polymer additives in the composite is 6%.

[0070] The mass ratio of pretreated alkali-free glass fiber, carbon nanotubes, and composite is 1:0.02:2; A method for preparing a high-toughness, low-temperature resistant composite material pole, comprising: First, the composite fiberglass resin material is mixed evenly with a curing agent to form a mixed colloid, and then a rod is formed in one step using a pultrusion process according to the corresponding dimensions. After impregnating alkali-free glass fiber with aliphatic polyurethane resin, the impregnated alkali-free glass fiber is evenly wound onto the surface of the rod using a four-dimensional winding machine. After curing at 85°C, the base rod is obtained. The base rod is then connected into two-section rods and three-section rods by interlocking. The curing agent is diaminodiphenylmethane, and the mass ratio of the curing agent to the composite fiberglass resin material is 1:6.

[0071] Example 5 The base rods in the segmented poles are all made of composite fiberglass resin material.

[0072] The preparation method of composite fiberglass resin material is as follows: (1) Preparation of reinforcing polymer additives; (2) Surface pretreatment of alkali-free glass fiber is performed to obtain pretreated alkali-free glass fiber; (3) The reinforcing polymer additive and aromatic polyurethane resin are melt-blended at high temperature for 50 min to obtain a composite; the high temperature melting temperature is 155℃. (4) The pretreated alkali-free glass fiber, filler and composite prepared are added to the high-pressure stirred reactor in proportion, the temperature is adjusted to 230℃, and the reaction is stirred at 500r / min for 55min to obtain composite fiberglass resin material.

[0073] The preparation method of the reinforcing polymer additive is as follows: First, add styrene to the reactor, introduce nitrogen gas to purge the air from the reactor, then adjust the temperature to 60°C and keep it at that temperature while stirring for 10 minutes. Then, maleic anhydride and dicumyl peroxide are added to dimethyl succinate in sequence and stirred until homogeneous to obtain an intermediate solution. The intermediate liquid prepared above was added dropwise into the reaction vessel and stirred for 3 hours to obtain a reaction mixture. The above-obtained reaction mixture was precipitated with excess methanol, then filtered, and dried at 80°C for 1 hour to obtain the precipitated reaction product. The precipitate was dissolved in acetone at a mass ratio of 1:10, and then precipitated with excess methanol. After filtration, the product was vacuum dried for 4 hours. The vacuum drying temperature is 50℃; The mass ratio of styrene to intermediate liquid is 5:1. The maleic anhydride and dicumyl peroxide were added sequentially to dimethyl succinate in a mass ratio of 8:1:18.

[0074] The preparation method of pretreated alkali-free glass fiber is as follows: First, prepare a 7% (w / w) alcohol-water solution of KH550; the mass ratio of ethanol to water in the KH550 alcohol-water solution is 6:1. Alkali-free glass fiber was ultrasonically cleaned in water for 12 minutes, then removed, dried, and added to an alcohol-water solution of KH550 at a mass ratio of 1:10. The temperature was adjusted to 65°C, and the fiber was impregnated under vacuum for 5 hours. After filtration and drying for 2 hours, the treated alkali-free glass fiber was obtained. The treated alkali-free glass fiber is evenly dispersed in deionized water, then the temperature is adjusted to 65℃ and stirred for 30 minutes. Then stearic acid and oleic acid are added, and the mixture is stirred for 4 hours. After ultrasonic treatment for 15 minutes, it is filtered, washed, and dried.

[0075] The vacuum degree of the vacuum impregnation is 0.2 Pa; The mass ratio of the treated alkali-free glass fiber, deionized water, stearic acid, and oleic acid is 12:38:1.5:6. The ultrasonic power frequency is 40kHz.

[0076] The mass fraction of reinforcing polymer additives in the composite is 6%.

[0077] The mass ratio of pretreated alkali-free glass fiber, carbon nanotubes, and composite is 1:0.02:3; A method for preparing a high-toughness, low-temperature resistant composite material pole, comprising: First, the composite fiberglass resin material is mixed evenly with a curing agent to form a mixed colloid, and then a rod is formed in one step using a pultrusion process according to the corresponding dimensions. After impregnating alkali-free glass fiber with aliphatic polyurethane resin, the impregnated alkali-free glass fiber is evenly wound onto the surface of the rod using a four-dimensional winding machine. After curing at 85°C, the base rod is obtained. The base rod is then connected into two-section rods and three-section rods by interlocking. The curing agent is diaminodiphenylmethane, and the mass ratio of the curing agent to the composite fiberglass resin material is 1:6.

[0078] Comparative Example 1: The difference from Example 1 is that no reinforcing polymer additive is added, while the rest of the technical solutions remain the same.

[0079] Comparative Example 2: The difference from Example 1 is that the alkali-free glass fiber is not treated, while the rest of the technical solutions remain the same.

[0080] test: Performance tests were conducted on base rods of the same dimensions made from the materials used in the examples and comparative examples: Test methods Tensile properties: Tested according to GB / T 1040—1979, tensile speed 10 mm / min; Table 2

[0081] As can be seen from Table 2, the poles made of the material in this invention have high tensile strength.

[0082] Impact performance: Tested according to GB / T 1043—1979; Table 3

[0083] As can be seen from Table 3, the impact strength of the poles made of the material of the present invention is significantly improved.

[0084] Shore hardness was tested at 10 different locations for each sample, according to GB / T 2411—1980. Table 4

[0085] As can be seen from Table 4, the introduction of reinforcing polymer additives will slightly reduce the hardness of the pole, thereby effectively improving the toughness of the pole.

[0086] Glass transition temperature was measured on the pole material of the example embodiment: The test was conducted using a 204 differential scanning calorimeter manufactured by Netzsch GmbH, Germany. The test conditions were as follows: the pole material sample of the example was heated from room temperature to 180°C under nitrogen protection, held at the temperature for 10 minutes, cooled to -100°C, and then heated to 180°C again. Table 5

[0087] As can be seen from Table 5, the pole material prepared by the present invention achieves a lower glass transition temperature and a significant improvement in low-temperature resistance by introducing reinforcing polymer additives.

[0088] Using Example 1 as the base sample, the effect of the mass fraction of reinforcing polymer additives in different composites on the impact strength of the pole was compared. Figure 2 .

[0089] The above description is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown. Any changes made in accordance with the concept of the present invention, or equivalent embodiments modified to have equivalent changes, shall be within the protection scope of the present invention as long as they do not exceed the spirit covered by the specification.

Claims

1. A high-toughness, low-temperature resistant composite material pole, characterized in that, The high-toughness, low-temperature resistant composite material pole is a segmented pole; The segmented rod includes two-section rods and three-section rods, which are formed by connecting two or three base rods in sequence. The base rods are connected by plugging and fastened with through-type screws. The base rods are all made of composite fiberglass resin material; the preparation method of the composite fiberglass resin material is as follows: (1) Preparation of reinforcing polymer additives; (2) Surface pretreatment of alkali-free glass fiber is performed to obtain pretreated alkali-free glass fiber; (3) After high-temperature melt blending of reinforcing polymer additives and aromatic polyurethane resin for 40-50 min, a composite is obtained; the high-temperature melt temperature is 155℃. (4) The pretreated alkali-free glass fiber, filler, and composite obtained are added to a high-pressure stirred reactor in proportion, the temperature is adjusted to 220-230℃, and the mixture is stirred at 500 r / min for 50-55 min to obtain the composite fiberglass resin material; the method for preparing the reinforcing polymer additive is as follows: First, add styrene into the reactor, introduce inert gas to purge the air from the reactor, then adjust the temperature to 55-60℃ and keep it at that temperature while stirring for 10 minutes. Then, maleic anhydride and dicumyl peroxide are added to dimethyl succinate in sequence and stirred until homogeneous to obtain an intermediate solution. The intermediate liquid prepared above is added dropwise into the reaction vessel and stirred for 2-3 hours to obtain a reaction mixture. The above-obtained reaction mixture was precipitated with an excess of precipitant, then filtered, and dried at 80°C for 1 hour to obtain the precipitated reaction product. Dissolve the precipitate in acetone at a mass ratio of 1:10, then precipitate with an excess of precipitant, filter, and vacuum dry for 4 hours. The vacuum drying temperature is 50℃; The precipitant is methanol; The method for preparing the pretreated alkali-free glass fiber is as follows: First, prepare an alcohol-water solution of KH550; Add alkali-free glass fiber to clean water and ultrasonically clean it for 10-12 minutes. Then take it out, dry it, add it to KH550 alcohol-water solution at a mass ratio of 1:8-10, adjust the temperature to 60-65℃, impregnate it under vacuum for 4-5 hours, filter it, and dry it for 2 hours to obtain the treated alkali-free glass fiber. The treated alkali-free glass fiber is evenly dispersed in deionized water, and then the temperature is adjusted to 60-65℃. The mixture is kept warm and stirred for 30 minutes. Then stearic acid and oleic acid are added, and the mixture is kept warm and stirred for 4 hours. Finally, it is ultrasonically treated for 10-15 minutes. After filtration, washing, and drying, it is ready.

2. The high-toughness, low-temperature resistant composite material pole according to claim 1, characterized in that: The inert gas is any one of nitrogen, neon, or helium; The mass ratio of styrene to intermediate liquid is 3-5:1; The maleic anhydride and dicumyl peroxide were added sequentially to dimethyl succinate in a mass ratio of 5-8:1:15-18.

3. The high-toughness, low-temperature resistant composite material pole according to claim 1, characterized in that: The mass ratio of ethanol to water in the KH550 aqueous solution is 6:

1. The mass fraction of KH550 is 6-7%; The vacuum degree of the vacuum impregnation is 0.1-0.2 Pa; The mass ratio of the treated alkali-free glass fiber, deionized water, stearic acid, and oleic acid is 10-12:35-38:1-1.5:5-6. The ultrasonic power frequency is 40kHz.

4. The high-toughness, low-temperature resistant composite material pole according to claim 1, characterized in that: The composite contains 5-8% by mass of reinforcing polymer additives.

5. The high-toughness, low-temperature resistant composite material pole according to claim 1, characterized in that: The mass ratio of the pretreated alkali-free glass fiber, filler, and composite is 1:0.02:2-3; The filler is carbon nanotubes.

6. The method for preparing a high-toughness, low-temperature resistant composite material pole according to claim 1, characterized in that, include: First, the composite fiberglass resin material is mixed evenly with a curing agent to form a mixed colloid, and then a rod is formed in one step using a pultrusion process according to the corresponding dimensions. After impregnating alkali-free glass fiber with aliphatic polyurethane resin, the impregnated alkali-free glass fiber is evenly wound onto the surface of the rod using a four-dimensional winding machine. After curing at 85°C, the base rod is obtained. The base rod is then connected into two-section rods and three-section rods by plugging.

7. The method for preparing a high-toughness, low-temperature resistant composite material pole according to claim 6, characterized in that: The curing agent is diaminodiphenylmethane, and the mass ratio of the curing agent to the composite fiberglass resin material is 1:6.

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