Easily-processed corrugated pipe and preparation method thereof

Abstract

The invention relates to the technical field of compositions of high-molecular compounds, in particular to an easy-to-process corrugated pipe and a preparation method thereof. The corrugated pipe comprises the following raw materials in parts by weight: 80-110 parts of polytetrafluoroethylene, 5-15 parts of modified glass fibers, 1-3 parts of an antistatic agent, 0.5-2 parts of an antioxidant, 2-5 parts of a lubricant and 4-8 parts of a plasticizer. The invention also provides a preparation method of the composition. Compared with the prior art, the corrugated pipe prepared by the invention is easy to process, wide in use temperature, good in wear resistance and high in aging resistance, and can be widely applied to industries such as petrifaction, instruments, spaceflight, chemical engineering, electric power and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of compositions of polymer compounds, and particularly to an easily processable corrugated pipe and a preparation method thereof. Background Art

[0002] A corrugated pipe is a cylindrical thin-walled wrinkled shell with multiple transverse corrugations. It can be classified into metal corrugated pipes and non-metal corrugated pipes according to the constituent materials, and can be divided into single-layer and multi-layer according to the structure. The main functions of corrugated pipes include compensating for thermal deformation of pipelines, shock absorption, and absorbing settlement deformation of pipelines. They are widely used in industries such as petrochemical, instrumentation, aerospace, chemical industry, electric power, cement, and metallurgy. Corrugated pipes made of other materials such as plastics also play an irreplaceable role in fields such as medium transportation, power wire threading, machine tools, and household appliances. A non-metal corrugated pipe is a corrugated pipe made of non-metal materials, and common materials include rubber, plastics (such as PVC, PE, PTFE, PFA, etc.). The following are some characteristics and applications of non-metal corrugated pipes: Material characteristics: Non-metal corrugated pipes are usually made of rubber or plastics, and these materials may be more susceptible to chemical corrosion and ultraviolet radiation than metals, so their service life may be shorter. A PFA corrugated pipe is a high-performance plastic pipe made of perfluoroalkoxy resin material, with excellent chemical stability, resistance to high and low temperatures, corrosion resistance, low friction coefficient, and good electrical insulation performance. Non-metal corrugated pipes are widely used in building water supply pipes, drainage pipes, urban buried water supply pipes, drainage pipes, gas pipes, rural water supply and drainage pipes, irrigation pipes, as well as industrial sewage and waste water and the transportation of chemical fluids, etc.

[0003] Polytetrafluoroethylene (PTFE) is a unique thermoplastic, known for its excellent chemical resistance, heat resistance, and low friction coefficient. PTFE pipes made of this material are widely used in many industries due to their extraordinary properties. The service temperature range of PTFE corrugated pipes is wide, from -200 degrees to 260 degrees, enabling them to work at extreme temperatures. PTFE corrugated pipes are inert to almost all chemicals and solvents, and can resist strong acids, strong alkalis, water, and various organic solvents. Therefore, they are widely used in various industries.

[0004] CN103978709A discloses a production process in the field of polytetrafluoroethylene high-pressure pipes, and particularly relates to a method for making a polytetrafluoroethylene reinforced pipe. The details are as follows: (1) Using polytetrafluoroethylene dispersed resin as raw material, preparing polytetrafluoroethylene pipe; A, raw material screening; B, batching; C, standing; D, aging; E, preforming of blank; F, pushing; G, deoiling, sintering and shaping; H, cooling and winding. (2) Using polytetrafluoroethylene dispersed resin as raw material; A, raw material screening; B, modifier pretreatment; C, batching; D, aging; E, preforming of blank; F, pushing; G, calendering; H, deoiling and shaping; I, shaping treatment; J, slitting; (3) Wrapping and sintering the polytetrafluoroethylene pipe with a special winding tape for polytetrafluoroethylene high-pressure pipes. The invention has the effect of being able to be used for a long time in various strong acid, strong alkali and strong corrosive environments, being able to withstand a fluid pressure ≥ 22MPa, and being able to be used for a long time at -60℃ ~ 260℃.

[0005] CN110105695A discloses a highly wear-resistant polytetrafluoroethylene composite material and a preparation method thereof, wherein the composite material is made of the following raw materials in parts by weight: 100 parts of polytetrafluoroethylene, 0.1-1 parts of rare earth oxide, 0.5-2 parts of fluorinated graphene, and 0.5-1 parts of multi-walled carbon nanotubes. The preparation method is as follows: after ultrasonic dispersion of fluorinated graphene, multi-walled carbon nanotubes, and rare earth oxides in acetone, polytetrafluoroethylene powder is added and ball milled; then drying in a vacuum drying oven to obtain a mixed powder; pressing the mixed powder into a shape under a pressure of 20-50MPa; after the molded green embryo is left to stand for 24 hours, it is freely sintered in a sintering furnace, kept at 365°C for several hours, and cooled with the furnace to obtain a composite material. The composite material of the invention has a stable friction coefficient and an ultra-low wear rate, and the preparation method is simple, easy to operate, low in cost, and easy to prepare in large quantities in industrialization. The composite material is easily processed into a thin sheet and used in a rotary ultrasonic motor, which can improve the speed stability and service life of the ultrasonic motor.

[0006] PTFE material has the lowest friction coefficient among solid materials, which makes PTFE as a bellows material with low resistance and low energy consumption in fluid transportation. PTFE bellows have excellent non-stick properties, and known solid materials cannot adhere to its surface. PTFE bellows show good electrical insulation properties and are suitable for safe and stable operation in electrified environments. PTFE bellows can be exposed to ozone and sunlight for a long time without aging. Although PTFE has excellent properties in all aspects, its hardness is relatively low and it is more sensitive to creep and wear, so it is more prone to deformation and wear when subjected to greater pressure or friction. Summary of the invention

[0007] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide an easily processable corrugated pipe and a preparation method thereof.

[0008] To improve the wear resistance of PTFE, it is usually improved by adding fillers and additives, such as glass fiber, bronze, steel, carbon, carbon fiber, graphite, etc. These fillers can significantly improve the mechanical properties of PTFE, especially creep and wear rate. However, the surface energy of PTFE is very low, resulting in poor compatibility with other materials. The inorganic fillers have poor bonding with PTFE and are prone to falling off during friction and wear, leading to poor wear resistance, easy damage to the counterpart, and poor machining performance, which limits its application under extremely harsh working conditions. Therefore, the present invention provides a modified glass fiber. As a material with high strength and high modulus, introducing a glass fiber reinforcement phase can prevent the slip of the PTFE matrix lattice and bear the load preferentially, and can transfer the compressive stress and shear stress on the friction surface to the interior of the matrix without stress concentration on the surface layer, effectively preventing large-area damage of PTFE. Therefore, adding it to PTFE can significantly enhance its wear resistance and compressive resistance. By modifying the glass fiber, the defect of poor compatibility with PTFE is improved, so as not to affect subsequent processing.

[0009] The present invention first activates the glass fiber to increase the activity on the fiber surface. The activated glass fiber reacts with diacyl chloride, and the diacyl chloride esterifies with the active hydroxyl groups on the glass fiber surface. Then diamine continues to react with the acyl chloride groups to obtain amide. Through graft modification, the interfacial properties of the glass fiber are changed, making its compatibility with the polymer better. Since the glass fiber can prevent PTFE from forming flaky wear debris, it can inhibit the excessive transfer and wear loss of PTFE, improve the load-bearing capacity and anti-plastic deformation ability of the composite material as well as its friction and wear performance. And the modified glass fiber has an amide group grafted on it, and the amide group has polarity and can form hydrogen bonds, which makes the intermolecular force larger. This stronger intermolecular force helps to improve the mechanical properties of the material, including wear resistance. Due to the presence of the amide group, crystallization is prone to occur. The crystalline region usually has a higher density and better mechanical properties, which helps to improve wear resistance. The presence of methylene in the amide group makes the modified glass fiber have a certain flexibility, which also affects the wear resistance of the final composite material. When an aromatic ring is connected to the amide group, the mechanical properties will be further improved. Therefore, the bellows prepared by the present invention are not only easy to process, but also have a wide use temperature, good wear resistance, and strong aging resistance, and can be widely used in industries such as petrochemical, instrumentation, aerospace, chemical engineering, and electric power.

[0010] To achieve the above object, the present invention provides an easy-to-process bellows, which comprises the following raw materials in parts by weight: 80 - 110 parts of polytetrafluoroethylene, 5 - 15 parts of modified glass fiber, 1 - 3 parts of antistatic agent, 0.5 - 2 parts of antioxidant, 2 - 5 parts of lubricant, and 4 - 8 parts of plasticizer;

[0011] The preparation method of the modified glass fiber comprises the following steps:

[0012] X1. Activate the glass fiber in piranha solution;

[0013] X2. React the activated fiber with acyl chloride in a medium, and then react with diamine and perform post-treatment to obtain the modified glass fiber.

[0014] Furthermore, the preparation method of the modified glass fiber comprises the following steps:

[0015] X1. Mix the glass fiber with piranha solution at a solid-liquid ratio of 1:15 - 25 g / mL, stir at room temperature for 20 - 30 h for activation, filter, dry the activated glass fiber and use it for the next step;

[0016] X2. Mix the activated glass fiber with toluene at a solid-liquid ratio of 1:10 - 20 g / mL, add diacyl chloride under a nitrogen atmosphere, stir for 1 - 2 h and then filter. Wash the glass fiber with toluene twice, dry it, add it to water with a volume 10 times that of the glass fiber, then add an aqueous solution of 0.1 mol / L diamine, stir at room temperature for 1 - 2 h, add dilute hydrochloric acid to adjust the pH to 7 - 8, filter, and wash the obtained glass fiber with toluene twice and dry it to obtain the product.

[0017] Furthermore, the mass ratio of the activated glass fiber to diacyl chloride and the aqueous solution of 0.1 mol / L diamine is 1:2 - 3:10 - 50.

[0018] Preferably, the acyl chloride is any one of sebacoyl chloride, azelaoyl chloride, and 1,4-bis[4-(chlorocarbonyl)-4-methylpentyl]benzene.

[0019] Preferably, the diamine is 1,8-octanediamine.

[0020] Furthermore, the antistatic agent is glycerol stearate.

[0021] Furthermore, the antioxidant is phosphite.

[0022] Furthermore, the lubricant is calcium stearate.

[0023] Furthermore, the plasticizer is phthalate.

[0024] A preparation method of an easily processable corrugated pipe comprises the following steps:

[0025] S1. Mix the raw materials in the formula and perform pressing. After cold pressing and forming, sinter to obtain a powder;

[0026] S2. Put the powder into a mold, heat it for blowing, and then cool and shape it to obtain the corrugated pipe.

[0027] Further, the pressure of the cold pressing is 50 - 60 MPa.

[0028] Further, the temperature of the sintering is 360 - 380 °C.

[0029] Further, the temperature of the heating and blowing is 300 - 350 °C.

[0030] Advantages of the present invention:

[0031] 1. Compared with the prior art, the bellows prepared by the present invention are not only easy to process, but also have a wide service temperature range, good wear resistance, and strong aging resistance, and can be widely applied to industries such as petrochemical, instrumentation, aerospace, chemical engineering, and electric power.

[0032] 2. By activating and then grafting and modifying the glass fiber, the present invention changes the interfacial properties of the glass fiber, making its compatibility with the polymer better. Adding it to the bellows not only improves the wear resistance but also enhances the mechanical properties. Description of the Drawings

[0033] Figure 1 It is a sample photo of the produced bellows. Detailed Embodiments

[0034] The piranha solution is prepared by mixing 98 wt% concentrated sulfuric acid and 30 wt% hydrogen peroxide solution at a volume ratio of 7:3.

[0035] Polytetrafluoroethylene, PTFE F - 201, Daikin, USA.

[0036] Glass fiber, with a diameter of 15 - 20 μm and a length of 30 - 40 μm.

[0037] 1,4 - bis[4 - (chloroformyl) - 4 - methylpentyl]benzene, 1,4 - bis[4 - (chloroformyl) - 4 - methylpentyl]benzene, CAS No.: 137334 - 85 - 1.

[0038] Example 1

[0039] A preparation method of an easy - to - process bellows, comprising the following steps, by weight:

[0040] S1. Mix 100 parts of polytetrafluoroethylene, 10 parts of modified glass fiber, 2 parts of glycerol stearate, 1 part of phosphite, 4 parts of calcium stearate, and 5 parts of dioctyl phthalate, and then press them. After cold pressing at 50 MPa and sintering at 360 °C, a powder material is obtained.

[0041] S2. Put the powder material into a mold, heat it to 320 °C for blowing, and then cool and shape it to obtain the bellows.

[0042] The preparation method of the modified glass fiber comprises the following steps:

[0043] X1. Mix the glass fiber with piranha solution at a solid-liquid ratio of 1:20 g / mL, stir for 24 h at room temperature for activation, filter, and dry the activated glass fiber for the next step;

[0044] X2. Mix the activated glass fiber with toluene at a solid-liquid ratio of 1:15 g / mL, add sebacoyl chloride under a nitrogen atmosphere, stir for 1 h and then filter. Wash the glass fiber with toluene twice and dry it, then add it to water with a volume 10 times that of the glass fiber. Then add an aqueous solution of 0.1 mol / L 1,8-octanediamine. The mass ratio of the activated glass fiber, sebacoyl chloride, and the aqueous solution of 0.1 mol / L 1,8-octanediamine is 1:2.5:40. Stir at room temperature for 1 h, add 0.1 mol / L dilute hydrochloric acid to adjust the pH to 8, filter, wash the obtained glass fiber with toluene twice and dry it to obtain the product.

[0045] Example 2

[0046] It is basically the same as Example 1, and the only difference is that the weight part of the modified glass fiber is 6 parts.

[0047] Example 3

[0048] It is basically the same as Example 1, and the only difference is that the weight part of the modified glass fiber is 8 parts.

[0049] Example 4

[0050] It is basically the same as Example 1, and the only difference is that the weight part of the modified glass fiber is 12 parts.

[0051] Example 5

[0052] It is basically the same as Example 1, and the only difference is that sebacoyl chloride is replaced by azelaoyl chloride.

[0053] Example 6

[0054] It is basically the same as Example 1, and the only difference is that sebacoyl chloride is replaced by 1,4-bis[4-(chlorocarbonyl)-4-methylpentyl]benzene.

[0055] Control Example 1

[0056] The preparation method of an easily processed corrugated pipe comprises the following steps, by weight parts:

[0057] S1. Mix 100 parts of polytetrafluoroethylene, 2 parts of glycerol stearate, 1 part of phosphite, 4 parts of calcium stearate, and 5 parts of dioctyl phthalate, and then press. After cold pressing at 50 MPa and sintering at 360 °C, a powder material is obtained;

[0058] S2. Put the powder material into a mold, heat it to 320 °C for blowing, and then obtain the corrugated pipe after cooling and shaping.

[0059] Control Example 2

[0060] A preparation method of an easily processed corrugated pipe includes the following steps, by weight:

[0061] S1. Mix 100 parts of polytetrafluoroethylene, 10 parts of glass fiber, 2 parts of glycerol stearate, 1 part of phosphite, 4 parts of calcium stearate, and 5 parts of dioctyl phthalate, and then carry out pressing. After cold pressing at 50 MPa and sintering at 360 °C, obtain the powder material;

[0062] S2. Put the powder material into a mold, heat it to 320 °C for blowing, and then obtain the corrugated pipe after cooling and shaping.

[0063] Control Example 3

[0064] A preparation method of an easily processed corrugated pipe includes the following steps, by weight:

[0065] S1. Mix 100 parts of polytetrafluoroethylene, 10 parts of modified glass fiber, 2 parts of glycerol stearate, 1 part of phosphite, 4 parts of calcium stearate, and 5 parts of dioctyl phthalate, and then carry out pressing. After cold pressing at 50 MPa and sintering at 360 °C, obtain the powder material;

[0066] S2. Put the powder material into a mold, heat it to 320 °C for blowing, and then obtain the corrugated pipe after cooling and shaping.

[0067] The preparation method of the modified glass fiber includes the following steps, by weight:

[0068] X1. Mix 10 parts of glass fiber with piranha solution at a solid-liquid ratio of 1:20 g / mL, stir at room temperature for 24 h for activation, filter, and dry the activated glass fiber for the next step;

[0069] X2. Mix the activated glass fiber with ethanol at a solid-liquid ratio of 1:15 g / mL, add 3-aminopropyltriethoxysilane under a nitrogen atmosphere, and the mass ratio of the activated glass fiber to 3-aminopropyltriethoxysilane is 1:2.5. Stir for 1 h and then filter. Wash the obtained glass fiber with ethanol twice and then dry to obtain.

[0070] Test Example 1

[0071] The mechanical properties of the bellows prepared in the examples and control examples were tested, including ring stiffness and tensile strength. The ring stiffness was tested with reference to GB / T9647-2015 "Determination of Ring Stiffness of Thermoplastic Pipe", and the ring stiffness was recorded. The impact strength was tested with reference to GB / T14152-2001 "Test Method for Resistance to External Impact of Thermoplastic Pipe - Needle Rotation Method". The diameter of the hammer head was 90 mm, the mass of the falling hammer was 15 kg, and the impact height was recorded. The wear resistance of the bellows prepared in the examples and control examples was tested, including the friction coefficient and mass wear rate. Based on the principle that the frictional force is proportional to the normal pressure, the frictional force under different normal pressures was measured to obtain the friction coefficient. The specific results are shown in Table 1.

[0072] Table 1 Test Results of Mechanical Properties and Wear Resistance of Bellows

[0073] Experimental scheme <![CDATA[Ring stiffness / kN / m 2 > Impact height / m Coefficient of friction Example 1 15.8 3.0 0.22 Example 2 14.6 2.6 0.21 Example 3 15.1 2.7 0.20 Example 4 15.5 2.7 0.21 Example 5 15.6 3.0 0.21 Example 6 16.2 3.1 0.23 Control example 1 13.2 2.5 0.10 Control example 2 12.8 2.5 0.25 Control example 3 14.5 2.6 0.23

[0074] Ring stiffness refers to the ability of the bellows to resist deformation and torsion in the circumferential direction. It is an important parameter to measure the ability of the bellows to withstand external pressure loads, especially the ability to resist soil pressure and other external forces during underground laying.

[0075] Impact strength refers to the ability of a material to withstand impact loads and is usually used to measure the toughness of the material. For bellows, impact strength is a key safety indicator, especially in applications where unexpected impacts or pressure surges need to be considered.

[0076] The friction coefficient is a physical quantity that describes the ratio of the force that hinders the relative sliding of two contacting surfaces during relative motion to the normal force perpendicular to the contact surface. It is an important parameter to measure the frictional characteristics of the material interface. The magnitude of the friction coefficient can reflect the magnitude of the sliding resistance of the material interface. The smaller the value, the smaller the frictional force between the materials and the easier the sliding. The friction coefficient of PTFE is very low, which is one of the important characteristics of the perfluorocarbon surface, but it is more likely to deform and wear under large pressures or frictional forces.

[0077] Compared with the bellows without glass fiber added in Control Example 1, the mechanical properties and friction coefficient of the bellows in the examples were significantly lower. In the examples and Control Example 2, due to the addition of glass fiber, and glass fiber can increase the contact stiffness and change the surface characteristics of the material, so the friction coefficient will increase and the mechanical properties will be improved.

[0078] When comparing Comparative Example 2 with Comparative Example 3, although both added glass fibers, the glass fibers in Comparative Example 2 were not modified. As an inorganic material, glass fibers are incompatible with the matrix, resulting in uneven distribution in the matrix. This will lead to uneven wear during the friction process of the material, thereby increasing the wear coefficient. Although the friction coefficient increases, it will also affect the mechanical properties, resulting in a decrease in ring stiffness and impact height, and a deterioration in processability. In both Comparative Example 3 and the examples, the glass fibers were modified. In Comparative Example 3, a silane coupling agent was used to modify the glass fibers, improving the compatibility, so that the distribution of the glass fibers in the matrix was more uniform. This not only can improve the friction coefficient, but also will not have a negative impact on processability and mechanical properties. In the examples, the modification of the glass fibers not only improved the friction coefficient, but also improved the mechanical properties. Compared with Comparative Example 3, the mechanical properties of the bellows in the examples were better. This may be because the modified glass fibers in the examples were grafted with fatty amide groups, and the amide groups are polar and can form hydrogen bonds, which makes the intermolecular force larger. This stronger intermolecular force helps to improve the mechanical properties of the material. Due to the presence of the amide group, crystallization is likely to occur. The crystalline regions usually have a higher density and better mechanical properties. The presence of methylene in the fatty amide group makes the modified glass fibers have a certain flexibility, which also affects the mechanical properties and wear resistance of the final composite material. Therefore, the ring stiffness and impact height are the largest. Compared with Examples 1 and 5, Example 6 has a larger ring stiffness and impact height, indicating better mechanical properties. This may be because compared with the diacyl chlorides in Examples 1 and 5, 1,4-bis[4-(chlorocarbonyl)-4-methylpentyl]benzene in Example 6 also has a benzene ring. As a group with a relatively large rigidity, the benzene ring can improve the mechanical properties, thus showing better impact resistance and compressive resistance.

[0079] Compared with other examples, Example 6 shows the best comprehensive performance, indicating that the ratio and composition in Example 6 are the best.

[0080] Test Example 2

[0081] The bellows in the examples and comparative examples were tested for tensile strength with reference to GB / T 1040.2-2022 "Determination of Tensile Properties of Plastics - Part 2: Test Conditions for Moulded and Extruded Plastics", and after aging at 250 °C for 1000 h, the tensile strength reduction rate was tested and recorded. The specific results are shown in Table 2.

[0082] Table 2 Test Results of the Aging Resistance Performance of Bellows

[0083] Experimental scheme Tensile strength / MPa Reduction rate of tensile strength / % Example 1 36.7 1.03 Example 2 34.2 1.11 Example 3 35.1 1.23 Example 4 36.2 1.10 Example 5 36.6 1.04 Example 6 37.0 1.01 Control example 1 28.1 1.57 Control example 2 30.2 1.34 Control example 3 33.5 1.26

[0084] PTFE has extremely high chemical stability and is hardly eroded by acids, alkalis, solvents and oxidants. This chemical stability enables PTFE to maintain its properties unchanged under the long-term action of high temperature and chemical media. In the PTFE molecule, the CF 2 units are arranged in a zigzag shape, and fluorine atoms almost cover the surface of the entire polymer chain. This molecular structure gives PTFE excellent heat resistance. Therefore, the bellows prepared in the examples all have good heat aging resistance. The tensile strength of Example 6 is the largest, which may be due to the fact that the amide groups grafted with glass fibers are connected with aromatic rings, resulting in further improvement of mechanical properties. The bellows prepared by the present invention have a wide service temperature range, good wear resistance and strong aging resistance, and can be widely used in industries such as petrochemical, instrumentation, aerospace, chemical engineering and electric power.

[0085] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations according to the concept of the present invention without creative work. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. An easily processable corrugated pipe, characterized in that: The invention comprises the following raw materials in parts by weight: 80 to 110 parts of polytetrafluoroethylene, 5 to 15 parts of modified glass fiber, 1 to 3 parts of antistatic agent, 0.5 to 2 parts of antioxidant, 2 to 5 parts of lubricant and 4 to 8 parts of plasticizer; The preparation method of the modified glass fiber comprises the following steps: X1. Activate the glass fiber in piranha solution; X2. The activated fiber is reacted with diacyl chloride in a medium, and then reacted with diamine to obtain modified glass fiber through post-treatment.

2. The easily processable corrugated tube according to claim 1, characterized in that: The preparation method of the modified glass fiber comprises the following steps: X1. Mix the glass fiber and piranha solution at a solid-liquid ratio of 1:15-25 g / mL, stir at room temperature for 20-30 hours to activate, filter, and dry the activated glass fiber for the next step; X2. Mix the activated glass fiber with toluene at a solid-liquid ratio of 1:10-20 g / mL, add diacyl chloride under a nitrogen atmosphere, stir for 1-2 hours and filter. Wash the glass fiber twice with toluene, dry it and add it to 10 times the volume of water, then add 0.1 mol / L aqueous solution of diamine, stir for 1-2 hours at room temperature, add dilute hydrochloric acid to adjust the pH to 7-8, filter it, wash the obtained glass fiber twice with toluene and dry it.

3. The easily processable corrugated tube according to claim 1, characterized in that: The mass ratio of the activated glass fiber to the aqueous solution of diacyl chloride and 0.1 mol / L diamine is 1:2-3:10-50.

4. The easily processable corrugated tube according to claim 1, characterized in that: The antistatic agent is glyceryl stearate.

5. The easily processable corrugated tube according to claim 1, characterized in that: The antioxidant is phosphite.

6. The easily processable corrugated tube according to claim 1, characterized in that: The lubricant is calcium stearate and the plasticizer is phthalate.

7. The method for preparing an easily processable corrugated pipe according to any one of claims 1 to 6, characterized in that: The steps include: S1, mixing the raw materials in the formula and pressing them, cold pressing them and then sintering them to obtain powder; S2. Powder is put into a mold, heated and inflated, and then cooled and shaped to obtain a corrugated tube.

8. The method for preparing the easily processable corrugated pipe according to claim 7, characterized in that: The cold pressing pressure is 50-60 MPa.

9. The method for preparing an easily processable corrugated pipe according to claim 7, characterized in that: The sintering temperature is 360-380°C.

10. The method for preparing an easily processable corrugated pipe according to claim 7, characterized in that: The temperature of the heating inflation is 300-350°C.

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