Impact-resistant PE pipe and preparation method thereof

Abstract

The invention relates to an impact-resistant PE pipe and a preparation method thereof, and belongs to the technical field of polymer composite materials. The PE pipe is prepared from the following components in percentage by weight: 6.2 to 9.5 percent of calcium carbonate whisker, 4.4 to 5.8 percent of impact modifier, 0.2 to 0.3 percent of lubricant, 0.15 to 0.2 percent of antioxidant, 0.11 to 0.14 percent of ultraviolet light absorber, 2.6 to 3.2 percent of color master batch and the balance of polyethylene resin, a disulfide structure in a molecular chain of the anti-impact modifier is loaded among the calcium carbonate whiskers through chelation in a multi-point anchoring mode to form a strengthening and impact energy dispersing network, and meanwhile, polycyclohexyl chain segments in the molecular chain form a large number of microvesicle unit structures on the surfaces of the calcium carbonate whiskers. Impact energy is absorbed and is uniformly dispersed and transitionally transmitted by slippage deformation of the vesicle structure, so that the impact resistance of the PE pipe is effectively improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of polymer composites, and particularly relates to an impact-resistant PE pipe and a preparation method thereof. BACKGROUND

[0002] Polyethylene (PE) pipe has become the mainstream material in the fields of municipal water supply and drainage, gas transportation, industrial fluid transportation and the like due to its excellent corrosion resistance, flexibility and low cost characteristics. Among them, high-density polyethylene (HDPE) is widely used in high-pressure water pipes and gas pipe systems as a branch of the polyethylene family with high mechanical strength, high crystallinity, high softening point, and excellent cold resistance and wear resistance.

[0003] To improve the strength of high-density polyethylene in pipe applications, the existing technology generally adopts inorganic filler strengthening strategies, such as adding calcium carbonate, talc powder, glass beads and the like. Although such fillers can significantly improve the tensile strength and modulus of the pipe, they also lead to an increase in the brittleness of the pipe and deterioration of the impact resistance. To compensate for the brittleness caused by the fillers, the existing technology mainly relies on two methods, but both have obvious limitations: 1. Coupling treatment, using silane or titanate coupling agents to bridge the fillers and the resin matrix through chemical bonds to improve the dispersibility and interfacial compatibility of the fillers. The coupling agent only optimizes the interfacial bonding and cannot fundamentally improve the toughness of the matrix, so the impact resistance of the pipe is not improved enough. 2. Toughening treatment, using elastomer toughening agents to blend to weaken the intermolecular forces of the matrix polyethylene, which can improve the impact resistance of the pipe to some extent, but reduces the strength of the pipe and exacerbates stress cracking with the inhomogeneous toughening agent, which restricts the effect of filler strengthening. The defects of the existing technology seriously hinder the development of high-performance impact-resistant PE pipes. SUMMARY

[0004] To solve the technical problems mentioned in the background art, the purpose of the present application is to provide an impact-resistant PE pipe and a preparation method thereof.

[0005] The purpose of the present application can be achieved by the following technical solutions: An impact-resistant PE pipe, according to the weight percentage, the specific components are: calcium carbonate whiskers 6.2-9.5wt%, impact-resistant modifier 4.4-5.8wt%, lubricant 0.2-0.3wt%, antioxidant 0.15-0.2wt%, ultraviolet absorber 0.11-0.14wt% and color master batch 2.6-3.2wt%, and the balance is polyethylene resin.

[0006] The impact-resistant modifier is prepared by the following method: Step A1: Mix 1,4-butanediol, triethylamine and anhydrous tetrahydrofuran, add dicyclohexyl dichlorosilane under dry atmosphere, ultrasonic oscillation reaction for 0.5-0.8h, then add ethylene glycol and heat to 50-60℃, stirring reaction for 1.2-1.8h, after the reaction is completed, filter out the salt, remove tetrahydrofuran by rotary evaporation, then wash with deionized water, separate the aqueous phase and dry to obtain a diol monomer; In the step A1 reaction, the amount ratio of dicyclohexyl dichlorosilane, 1,4-butanediol, ethylene glycol, triethylamine and anhydrous tetrahydrofuran is 0.1 mol: 70-85 mmol: 30-50 mmol: 15-20 mL: 60-80 mL, dicyclohexyl dichlorosilane and 1,4-butanediol are substituted and capped by ethylene glycol to form a chain compound containing a large amount of cyclohexyl, and the specific reaction route is as follows:

[0007] Step A2: Mix undecylenic acid, ethanedithiol, photosensitizer and dimethyl sulfoxide, apply 40-50 mW / cm 2 UV irradiation, stirring reaction at room temperature for 2.5-3.2h, after the reaction is completed, add deionized water to wash, separate the aqueous phase to elute dimethyl sulfoxide, then remove water under reduced pressure and take out residual dimethyl sulfoxide by rotary evaporation to obtain a diacid monomer; In the step A2 reaction, the amount ratio of undecylenic acid, ethanedithiol, photosensitizer and dimethyl sulfoxide is 0.1 mol: 52-55 mmol: 20-25 mg: 35-45 mL, undecylenic acid and ethanedithiol are added under photo initiation, and the specific reaction route is as follows:

[0008] Step A3: Mix diol monomer, diacid monomer and tetrabutyl titanate, heat to 160-180℃ under nitrogen protection for esterification reaction for 2.7-3.3h, then reduce the pressure to 100 Pa, heat to 200-220℃ for polymerization reaction for 1.5-2h, after the reaction is completed, discharge and cool to obtain an impact modifier; In the step A3 reaction, the molar ratio of diol monomer and diacid monomer is 1.02-1.04:1, and the amount of tetrabutyl titanate is 0.35-0.4wt%; diol monomer and diacid monomer are esterified and polycondensed to form a macromolecular chain, and the specific reaction route is as follows:

[0009] Preferably, the length of the calcium carbonate whisker is 30-80μm, the whisker of this specification has good dispersibility, and can also play a good physical strengthening role.

[0010] Preferably, the lubricant is compounded by polyethylene wax and calcium stearate, which has internal and external lubricating effects, is beneficial to the molding of the pipe material, and promotes the dispersion of calcium carbonate whiskers.

[0011] The application discloses a preparation method of an impact-resistant PE pipe material. Step S1: 1 / 3 of polyethylene resin by weight is mixed with other components, and is melted and mixed by being heated to 160-170 DEG C, and is crushed after being discharged and cooled to obtain a composite master batch; Step S2: the rest of the polyethylene resin is mixed with the composite master batch, and is sent into a pipe making machine to be plasticized, extruded, cooled and shaped at 200-210 DEG C to obtain the impact-resistant PE pipe material.

[0012] Preferably, the melt pressure is 18-22 MPa during the plasticizing and extruding process, the pipe material is uniform in wall thickness, stable in size, dense in pipe wall and high in comprehensive performance.

[0013] The application has the following beneficial effects: The application discloses a preparation scheme of an impact-resistant PE pipe material modified by an impact-resistant modifier and calcium carbonate whiskers, wherein the impact-resistant modifier is formed by substitution reaction of dicyclohexyl dichlorosilane and 1,4-butanediol to form a compound rich in cyclohexyl, and then end-capped by ethylene glycol to form a diol monomer, and then click addition of undecylenic acid and ethanedithiol to form a diacid monomer, and finally esterification of the diol monomer and the diacid monomer to form a macromolecular compound, namely the impact-resistant modifier; after blending modification, the di-sulfide structure in the molecular chain of the impact-resistant modifier forms chelation with the calcium carbonate whiskers, the impact-resistant modifier is loaded between the calcium carbonate whiskers in the form of multi-point anchoring, an organic-inorganic reinforcing network is formed, and an impact energy transmission bridge is also constructed; the multi-cyclohexyl segment in the molecular chain of the impact-resistant modifier has good compatibility with HDPE, a large spatial structure, and no additional force with the calcium carbonate whiskers, and then a large number of "microvesicle" unit structures are formed on the surface of the calcium carbonate whiskers, when the "microvesicle" structures absorb impact energy under external force, the "microvesicle" structures slide and deform uniformly, disperse and transition, and the impact resistance of the PE pipe material is effectively improved. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0015] Embodiment 1: the impact-resistant PE pipe material is prepared, and the specific implementation process is as follows: (1) preparation of the impact-resistant modifier Step A1: 1,4-butanediol, triethylamine and anhydrous tetrahydrofuran were mixed, protected by dry nitrogen, dicyclohexyl dichlorosilane was added, and ultrasonic oscillation was applied for 0.8 h. Then, ethylene glycol was added and the reaction was stirred at 50°C for 1.8 h. The amount ratio of dicyclohexyl dichlorosilane, 1,4-butanediol, ethylene glycol, triethylamine and anhydrous tetrahydrofuran was 0.1 mol: 85 mmol: 30 mmol: 15 mL: 60 mL. After the reaction was completed, the salt was removed by filtration, tetrahydrofuran was removed by rotary evaporation, and then deionized water was mixed and washed. The aqueous phase was separated and dried to obtain a diol monomer.

[0016] Step A2: undecylenic acid, ethanedithiol, photosensitizer and dimethyl sulfoxide were mixed, and 40 mW / cm2ultraviolet irradiation was applied 2 for 3.2 h at room temperature. The photosensitizer was selected from a photoinitiator 1173. The amount ratio of undecylenic acid, ethanedithiol, photosensitizer and dimethyl sulfoxide was 0.1 mol: 52 mmol: 20 mg: 35 mL. After the reaction was completed, deionized water was added to wash, the water phase was separated to elute dimethyl sulfoxide, and then the water was removed by rotary evaporation under reduced pressure to take out the residual dimethyl sulfoxide, thereby obtaining a diacid monomer.

[0017] Step A3: the diol monomer and the diacid monomer were prepared according to the alcohol acid molar ratio of 1.02:1, 0.35wt% of tetrabutyl titanate was added and mixed, protected by nitrogen, and then esterification was carried out at 160°C for 3.3 h. Then, the pressure was reduced to 100 Pa, and polymerization was carried out at 200°C for 2 h. After the reaction was completed, the material was discharged and cooled to obtain an impact modifier.

[0018] (2) Preparation of impact-resistant PE pipe The following components were prepared: calcium carbonate whiskers 6.2wt%, commercially available whisker length distribution 30-40μm; impact modifier 4.4wt%, self-made by the present embodiment; lubricant 0.3wt%, polyethylene wax and calcium stearate were used in a weight ratio of 2:1; antioxidant 0.2wt%, antioxidant 1010 and antioxidant 168 were used in a weight ratio of 1:1; ultraviolet absorber 0.14wt%, UV-531 type raw material was selected; color master batch 2.6wt%, commercially available black master batch was selected; the balance was 6380M type high density polyethylene resin.

[0019] Step S1: 1 / 3 weight of polyethylene resin and the remaining components were added to a high-speed mixer and mixed. The mixture was added to a banbury mixer and melt mixed at 160°C. After cooling, the material was crushed to obtain a composite master batch.

[0020] Step S2: the rest of the polyethylene resin and the composite master batch were added into a high-speed mixer and mixed uniformly, and then were sent into a pipe making machine to be plasticized and extruded at 200℃, the parameters of the extruder were controlled to adjust the melt pressure in the extrusion process to be in the range of 18-20 MPa, and the extruded pipe was cooled and shaped by spraying to obtain the impact resistant PE pipe.

[0021] Example 2, preparation of impact resistant PE pipe, the specific implementation process is as follows: (1) Preparation of impact resistant modifier Step A1: 1, 4-butanediol, triethylamine and anhydrous tetrahydrofuran were mixed uniformly, dry nitrogen was introduced for protection, dicyclohexyl dichlorosilane was added, ultrasonic oscillation reaction was carried out at 20 kHz for 0.6 h, then ethylene glycol was added and the temperature was increased to 50℃ for stirring reaction for 1.4 h, wherein the amount ratio of dicyclohexyl dichlorosilane, 1, 4-butanediol, ethylene glycol, triethylamine and anhydrous tetrahydrofuran was 0.1 mol:80 mmol:40 mmol:15 mL:70 mL, after the reaction was completed, the salt was removed by filtration, the tetrahydrofuran was removed by rotary evaporation, then deionized water was mixed and washed, the water phase was separated and dried to obtain the diol monomer.

[0022] Step A2: undecylenic acid, ethanedithiol, photosensitizer and dimethyl sulfoxide were mixed uniformly, 50 mW / cm 2 ultraviolet irradiation, stirring reaction was carried out at room temperature for 3 h, wherein the photosensitizer was selected from photoinitiator 1173, the amount ratio of undecylenic acid, ethanedithiol, photosensitizer and dimethyl sulfoxide was 0.1 mol:55 mmol:20 mg:40 mL, after the reaction was completed, deionized water was added for mixing and washing, the water phase was separated and the dimethyl sulfoxide was eluted, then the water was removed by rotary evaporation under reduced pressure and the residual dimethyl sulfoxide was removed, to obtain the diacid monomer.

[0023] Step A3: the diol monomer and the diacid monomer were dosed according to the alcohol acid molar ratio of 1.02:1, 0.38wt% of tetrabutyl titanate was added and mixed uniformly, nitrogen was introduced for protection, the temperature was increased to 170℃ for esterification reaction for 3 h, then the pressure was reduced to 100 Pa, the temperature was increased to 210℃ for polymerization reaction for 1.7 h, after the reaction was completed, the material was discharged and cooled to obtain the impact resistant modifier.

[0024] (2) Preparation of impact resistant PE pipe The components were dosed as follows: calcium carbonate whisker 8.5wt%, commercially available whisker length distribution 30-40μm; impact resistant modifier 5.2wt%, self-made by the present embodiment; lubricant 0.25wt%, polyethylene wax and calcium stearate were used in a weight ratio of 2:1; antioxidant 0.17wt%, antioxidant 1010 and antioxidant 168 were used in a weight ratio of 1:1; ultraviolet absorber 0.12wt%, UV-531 type raw material was selected; color master batch 3.2wt%, commercially available black master batch was selected; the rest was 6380M type high density polyethylene resin.

[0025] Step S1: 1 / 3 weight of polyethylene resin and the rest of the components were added to a high mixer and mixed uniformly, the mixture was added to a banbury mixer and melt mixed at 170℃, the outfeed was cooled and then crushed to obtain a composite master batch.

[0026] Step S2: the rest of the polyethylene resin and the composite master batch were added to a high mixer and mixed uniformly, and then sent to a pipe making machine to be plasticized and extruded at 200℃, the parameters of the extruder were set to control the melt pressure in the extrusion process to be in the range of 18-20MPa, and the extruded pipe was shaped by spray cooling to obtain an impact resistant PE pipe.

[0027] Example 3, preparation of impact resistant PE pipe, the specific implementation process is as follows: (1) Preparation of impact modifier Step A1: 1,4-butanediol, triethylamine and anhydrous tetrahydrofuran were mixed uniformly, dry nitrogen was introduced for protection, dicyclohexyl dichlorosilane was added, and ultrasonic oscillation was applied for 0.5h, then ethylene glycol was added and the temperature was raised to 60℃ for stirring reaction for 1.2h, wherein the amount ratio of dicyclohexyl dichlorosilane, 1,4-butanediol, ethylene glycol, triethylamine and anhydrous tetrahydrofuran was 0.1mol:70mmol:50mmol:20mL:80mL, after the reaction was completed, the salt was removed by filtration, the tetrahydrofuran was removed by rotary evaporation, then washed with deionized water, the water phase was separated and dried to obtain a diol monomer.

[0028] Step A2: undecylenic acid, ethanedithiol, photosensitizer and dimethyl sulfoxide were mixed uniformly, 50mW / cm 2 UV irradiation, stirring at room temperature for 2.5h, wherein the photosensitizer was selected from photoinitiator 1173, the amount ratio of undecylenic acid, ethanedithiol, photosensitizer and dimethyl sulfoxide was 0.1mol:55mmol:25mg:45mL, after the reaction was completed, deionized water was added for washing, the water phase was separated and dimethyl sulfoxide was eluted, then the water was removed by rotary evaporation under reduced pressure and the residual dimethyl sulfoxide was removed, to obtain a diacid monomer.

[0029] Step A3: the diol monomer and the diacid monomer were dosed according to the alcohol acid molar ratio of 1.04:1, 0.4wt% of tetrabutyl titanate was added and mixed uniformly, nitrogen was introduced for protection, the temperature was raised to 180℃ for esterification reaction for 2.7h, then the pressure was reduced to 100Pa, the temperature was raised to 220℃ for polymerization reaction for 1.5h, after the reaction was completed, the outfeed was cooled to obtain an impact modifier.

[0030] (2) Preparation of impact resistant PE pipe The components are dosed as follows: calcium carbonate whiskers 9.5 wt%, commercially available whisker length distribution of 50-80 μm; impact modifier 5.8 wt%, self-made in this example; lubricant 0.2 wt%, polyethylene wax and calcium stearate are used in a weight ratio of 2:1; antioxidant 0.15 wt%, antioxidant 1010 and antioxidant 168 are used in a weight ratio of 1:1; ultraviolet absorber 0.11 wt%, UV-531 type raw material is selected; color master batch 3 wt%, commercially available black master batch is selected; the balance is 6380M type high density polyethylene resin.

[0031] Step S1: 1 / 3 weight of polyethylene resin and the remaining components are added to a high mixer and mixed uniformly, the mixture is added to a banbury mixer and melted and mixed at 170°C, the discharged material is cooled and crushed to obtain a composite master batch.

[0032] Step S2: the balance of polyethylene resin and the composite master batch are added to a high mixer and mixed uniformly, and are sent to a pipe making machine for plasticizing and extrusion at 210°C, the parameters of the extruder are set to control the melt pressure in the extrusion process to be in the range of 20-22 MPa, the extruded pipe material is cooled and shaped by spraying to obtain an impact resistant PE pipe material.

[0033] Example 4, preparation of impact resistant PE pipe material, the specific implementation process is as follows: (1) Preparation of impact modifier Step A1: 1,4-butanediol, triethylamine and anhydrous tetrahydrofuran are mixed uniformly, dry nitrogen is introduced for protection, dicyclohexyl dichlorosilane is added, ultrasonic oscillation is applied for 0.7 h, then ethylene glycol is added and the temperature is raised to 55°C for stirring for 1.5 h, wherein the amount ratio of dicyclohexyl dichlorosilane, 1,4-butanediol, ethylene glycol, triethylamine and anhydrous tetrahydrofuran is 0.1 mol:75 mmol:40 mmol:18 mL:70 mL, after the reaction is completed, the salt is removed by filtration, the tetrahydrofuran is removed by rotary evaporation, then it is mixed and washed with deionized water, the water phase is separated and dried to obtain a diol monomer.

[0034] Step A2: undecylenic acid, ethanedithiol, photosensitizer and dimethyl sulfoxide are mixed uniformly, 45 mW / cm 2 UV irradiation, stirring at room temperature for 2.8 h, wherein the photosensitizer is selected from photoinitiator 1173, the amount ratio of undecylenic acid, ethanedithiol, photosensitizer and dimethyl sulfoxide is 0.1 mol:55 mmol:25 mg:45 mL, after the reaction is completed, deionized water is added for mixing and washing, the water phase is separated and eluted with dimethyl sulfoxide, then the water is removed by rotary evaporation under reduced pressure and the residual dimethyl sulfoxide is carried out to obtain a diacid monomer.

[0035] Step A3: Take the dihydric alcohol monomer and diacid monomer according to the alcohol acid molar ratio of 1.03:1, add 0.4wt% of tetrabutyl titanate and mix, protect with nitrogen, heat to 180°C for esterification reaction for 2.9h, then reduce the pressure to 100Pa, heat to 220°C for polymerization reaction for 1.7h, after the reaction is completed, the material is discharged and cooled to obtain the impact modifier.

[0036] (2) Preparation of impact-resistant PE pipe The following components are compounded: calcium carbonate whiskers 8wt%, commercially available whisker length distribution 50-80μm; impact modifier 4.9wt%, self-made by the present embodiment; lubricant 0.25wt%, polyethylene wax and calcium stearate are used in a weight ratio of 2:1; antioxidant 0.18wt%, antioxidant 1010 and antioxidant 168 are used in a weight ratio of 1:1; ultraviolet absorber 0.13wt%, UV-531 type raw material is selected; color master batch 2.8wt%, commercially available black master batch is selected; the balance is 6380M type high density polyethylene resin.

[0037] Step S1: 1 / 3 weight of polyethylene resin and the remaining components are added to a high mixer and mixed, the mixture is added to a banbury mixer and melt mixed at 160°C, after cooling, the material is crushed to obtain a composite master batch.

[0038] Step S2: The balance of polyethylene resin and the composite master batch are added to a high mixer and mixed, and then sent to a pipe making machine for plasticizing extrusion at 210°C, the parameters of the extruder are set to control the melt pressure in the extrusion process to be in the range of 20-22MPa, and the extruded pipe is cooled and shaped by spraying to obtain the impact-resistant PE pipe.

[0039] Comparative Example 1: According to the prior art, POE is used to toughen and improve impact resistance, the specific implementation process refers to Example 4, according to the existing production experience, the impact modifier is replaced by 7.5wt% of LC575 type POE toughening agent, the balance is adjusted to 100wt% by polyethylene resin, and the rest of the implementation process is the same.

[0040] Comparative Example 2: According to the existing interface treatment technology, according to the existing production experience, 1.5wt% of cyclohexyl trimethoxysilane is used to replace the impact modifier, the balance is adjusted to 100wt% by polyethylene resin, and the rest of the implementation process is the same.

[0041] The pipe material was sampled from the pipe material as above, and the ring stiffness test was carried out according to the standard ISO 9969:2016, at a rate of 5 mm / min compression to 3% deformation; the drop hammer impact test was carried out according to the standard GB / T 14152-2001, with an impact height of 2 m and a hammer head curvature radius of 25 mm; the impact strength test was carried out according to the standard ISO 180:2023, with a 2 mm deep V-shaped notch and a pendulum energy of 5.5 J; the environmental stress cracking resistance time test was carried out according to the standard GB / T 1842-2008, and the 50% sample cracking time was recorded; the specific test results are shown in Table 1:

[0042] As can be seen from the test results in Table 1, the ring stiffness of the pipe material prepared in the examples is higher than that of the comparative examples, indicating that the introduction of the impact resistance modifier forms a strengthening effect in the pipe material, and the notched impact strength of the examples is significantly higher than that of the comparative examples, and the drop hammer impact breakage rate is significantly lower than that of the comparative examples, indicating that the impact resistance modifier has excellent impact resistance improvement effect.

[0043] In the description of the specification, the description of the reference terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0044] The above is only an example and description of the present application, and those skilled in the art can make various modifications or supplements or use similar ways to replace the described specific embodiments, as long as they do not deviate from the invention or exceed the scope defined by the present claims, and should belong to the protection scope of the present application.

Claims

1. An impact-resistant PE pipe, characterized in that, The specific components are: 6.2-9.5 wt% calcium carbonate whiskers, 4.4-5.8 wt% impact modifier, 0.2-0.3 wt% lubricant, 0.15-0.2 wt% antioxidant, 0.11-0.14 wt% UV absorber, and 2.6-3.2 wt% color masterbatch, with the balance being polyethylene resin; The impact modifier is prepared by the following method: Step A1: Mix 1,4-butanediol, triethylamine and anhydrous tetrahydrofuran, add dicyclohexyldichlorosilane under a dry atmosphere and sonicate for 0.5-0.8 h, then add ethylene glycol and heat to 50-60℃ and stir for 1.2-1.8 h to prepare a diol monomer; Step A2: Mix undecenoic acid, ethylenedithiol, photosensitizer, and dimethyl sulfoxide thoroughly, and apply at 40-50 mW / cm². 2 The reaction was carried out under ultraviolet irradiation and stirred at room temperature for 2.5-3.2 hours to prepare a dicarboxylic acid monomer. Step A3: Mix the diol monomer, diacid monomer and tetrabutyl titanate, and esterify them at 160-180℃ under nitrogen protection for 2.7-3.3h. Then reduce the pressure to 100Pa and heat to 200-220℃ for 1.5-2h. After the reaction is completed, discharge and cool to obtain the impact modifier.

2. The impact-resistant PE pipe according to claim 1, characterized in that, The ratio of dicyclohexyldichlorosilane, 1,4-butanediol, ethylene glycol, triethylamine, and anhydrous tetrahydrofuran is 0.1 mol: 70-85 mmol: 30-50 mmol: 15-20 mL: 60-80 mL.

3. The impact-resistant PE pipe according to claim 2, characterized in that, The ratio of undecenoic acid, ethylenedithiol, photosensitizer, and dimethyl sulfoxide is 0.1 mol: 52-55 mmol: 20-25 mg: 35-45 mL.

4. The impact-resistant PE pipe according to claim 3, characterized in that, The molar ratio of alcohol to diacid monomer is 1.02-1.04:1, and the amount of tetrabutyl titanate is 0.35-0.4wt%.

5. The impact-resistant PE pipe according to claim 1, characterized in that, The length of calcium carbonate whiskers is 30-80 μm.

6. The impact-resistant PE pipe according to claim 1, characterized in that, The lubricant is a combination of polyethylene wax and calcium stearate.

7. A method for preparing impact-resistant PE pipe according to any one of claims 1-6, characterized in that, Specifically: Step S1: Mix 1 / 3 of the weight of polyethylene resin with the remaining components, heat to 160-170℃ to melt and mix, discharge and cool, then crush to obtain composite masterbatch; Step S2: Mix the remaining polyethylene resin with the composite masterbatch, feed it into the pipe making machine for plasticizing and extrusion at 200-210℃, and cool and shape it to obtain impact-resistant PE pipe.

8. The method for preparing an impact-resistant PE pipe according to claim 7, characterized in that, The melt pressure during plasticizing and extrusion is 18-22 MPa.

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