A polybutene composition and its application, polybutene pipe and its preparation method

Abstract

The present invention relates to the field of materials technology, and discloses a polybutene composition and application thereof, a polybutene pipe and a preparation method thereof. The polybutene composition, calculated by weight, comprises the following components: 100 parts of polybutene, 0.1-1 parts of a nucleating agent, and 0.2-1.2 parts of a lubricant; wherein the nucleating agent contains phthalylglycine, N1,N4 dicyclohexyl terephthalamide, and 2,2'-methylene-bis(4,6-di-tert-butylphenyl phosphate) basic aluminum in a weight ratio of 1:(1-5):(1-5). In the present invention, by selecting phthalylglycine, N1,N4 dicyclohexyl terephthalamide, and 2,2'-methylene-bis(4,6-di-tert-butylphenyl phosphate) basic aluminum in a specific weight ratio as the nucleating agent, not only can the polybutene pipe quickly reach maximum ring stiffness, but also the maximum ring stiffness of the polybutene pipe can be improved.

Description

Technical Field

[0001] The present invention relates to the field of material technology, and more specifically, to a polybutene composition and application thereof, a polybutene pipe and a preparation method thereof. Background Art

[0002] Polybutylene (PB) pipes offer high heat and pressure resistance, chemical stability, plasticity, and durability. The material itself is non-toxic, tasteless, and odorless, and is primarily used in hot and cold water supply, heating and hot spring pipes, and in industrial and agricultural applications. However, during processing, the crystal structure of freshly extruded polybutylene pipes is in the metastable Form II, at which point the ring stiffness of the polybutylene pipe has not yet reached its maximum value. Form II then slowly transforms into the stable Form I, bringing the ring stiffness to its maximum value. This crystallization transition typically takes five days, extending the production cycle and increasing production costs.

[0003] In addition, since the maximum ring stiffness of polybutene pipes refers to the maximum circumferential deformation capacity that the pipes can withstand when subjected to external forces, it is an important indicator for measuring the compressive and pressure-resistant performance of the pipes. Therefore, improving the maximum ring stiffness of polybutene pipes can enhance the structural stability of the pipelines, enable polybutene pipes to better resist external pressure deformation, and adapt to different engineering requirements.

[0004] Therefore, developing a polybutene composition that can enable a polybutene pipe to quickly reach the maximum ring stiffness and improve the maximum ring stiffness of the polybutene pipe has important economic value. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that polybutene pipes in the prior art cannot quickly reach the maximum ring stiffness, and to improve the maximum ring stiffness of polybutene pipes, and to provide a polybutene composition and its application, a polybutene pipe and its preparation method.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] In a first aspect, the present invention provides a polybutene composition comprising the following components, calculated in parts by weight:

[0008] 100 parts of polybutene, 0.1-1 parts of nucleating agent, 0.2-1.2 parts of lubricant;

[0009] The nucleating agent contains phthalylglycine, N1,N4 dicyclohexyl terephthalamide, and 2,2'-methylene-bis(4,6-di-tert-butylphenyl phosphate) basic aluminum in a weight ratio of 1:(1-5):(1-5).

[0010] In the present invention, by selecting phthalylglycine, N1,N4 dicyclohexyl terephthalamide, and 2,2'-methylene-bis(4,6-di-tert-butylphenyl phosphate) basic aluminum in a specific weight ratio as nucleating agents, not only can the polybutene pipe quickly reach the maximum ring stiffness, but also the maximum ring stiffness of the polybutene pipe can be improved.

[0011] Specifically, when phthalylglycine, N1,N4 dicyclohexyl terephthalamide, and 2,2'-methylene-bis(4,6-di-tert-butylphenyl phosphate) basic aluminum in a specific weight ratio are used as nucleating agents, the compatibility between the nucleating agent and polybutene can be improved, fine grains can be formed, heterogeneous nucleation can be promoted, and the melt viscosity of polybutene can be reduced, thereby improving the nucleation effect of polybutene and accelerating the transformation of polybutene from metastable crystal form II to stable crystal form I, so that the polybutene pipe prepared using the polybutene composition can quickly reach the maximum ring stiffness.

[0012] In addition, 2,2'-methylene-bis(4,6-di-tert-butylphenyl phosphate) basic aluminum has a high melting point, which can refine the grains and improve the crystallinity. At the same time, it can also increase the orderly arrangement of the molecular segments of polybutene, which is beneficial to improving the maximum ring stiffness of the polybutene pipe. Phthaloylglycine and N1,N4 dicyclohexyl terephthalamide have good dispersibility in the polybutene melt, which can make the grains more evenly distributed in the melt, increase the crystallization rate, and be beneficial to quickly and stabilizing the orderly arrangement of the molecular segments of polybutene, thereby improving the maximum ring stiffness of the polybutene pipe.

[0013] Preferably, the weight ratio of phthaloylglycine, N1,N4 dicyclohexyl terephthalamide, and 2,2'-methylene-bis(4,6-di-tert-butylphenyl phosphate) basic aluminum is 1:1:1, 1:2:1, 1:3:1, 1:4:1, 1:5:1, 1:1:1.5, 1:2:1.5, 1:3:1.5, 1:4:1.5, 1:5:1.5, 1:1: The range value of one or any two of 1.5, 1:1:2, 1:2:2, 1:3:2, 1:4:2, 1:5:2, 1:1:3, 1:2:3, 1:3:3, 1:4:3, 1:5:3, 1:1:4, 1:2:4, 1:3:4, 1:4:4, 1:5:4, 1:1:5, 1:2:5, 1:3:5, 1:4:5, and 1:5:5.

[0014] More preferably, the nucleating agent contains phthalylglycine, N1,N4 dicyclohexylterephthalamide, and 2,2'-methylene-bis(4,6-di-tert-butylphenyl phosphate) basic aluminum in a weight ratio of 1:(2-4):(1.5-3).

[0015] More preferably, the weight ratio of phthaloylglycine, N1,N4 dicyclohexylterephthalamide, and 2,2'-methylene-bis(4,6-di-tert-butylphenyl phosphate) basic aluminum is 1:3:2.

[0016] Preferably, the lubricant is at least one of PE wax (polyethylene wax), PP wax (polypropylene wax), paraffin wax, zinc stearate, and tristearin.

[0017] More preferably, the lubricant is zinc stearate and PP wax (polypropylene wax) in a weight ratio of 1:(1-8).

[0018] More preferably, the weight ratio of zinc stearate to PP wax (polypropylene wax) is 1:1, 1:1.2, 1:1.5, 1:1.7, 1:2, 1:2.2, 1:2.5, 1:2.7, 1:3, 1:3.2, 1:3.5, 1:3.7, 1:4, 1:4.2, 1:4.5, 1:4.7, 1:5, 1:5.2, 1:5.5, 1:5.7, 1:6, 1:6.2, 1:6.5, 1:6.7, 1:7, 1:7.2, 1:7.5, 1:7.7, 1:8 or any two of the range values.

[0019] More preferably, the lubricant is zinc stearate and PP wax (polypropylene wax) in a weight ratio of 1:(2-5).

[0020] More preferably, the lubricant is zinc stearate and paraffin in a weight ratio of 1:(1-8).

[0021] More preferably, the weight ratio of zinc stearate to paraffin is 1:1, 1:1.2, 1:1.5, 1:1.7, 1:2, 1:2.2, 1:2.5, 1:2.7, 1:3, 1:3.2, 1:3.5, 1:3.7, 1:4, 1:4.2, 1:4.5, 1:4.7, 1:5, 1:5.2, 1:5.5, 1:5.7, 1:6, 1:6.2, 1:6.5, 1:6.7, 1:7, 1:7.2, 1:7.5, 1:7.7, 1:8 or any two of the range values.

[0022] More preferably, the lubricant is zinc stearate and paraffin in a weight ratio of 1:(2-5).

[0023] Polybutene commonly used in the art can be used in the present invention.

[0024] Preferably, the polybutene has a melt flow rate of 0.3-0.8 g / 10 min measured at 190° C. and a load of 2.16 kg.

[0025] More preferably, the melt flow rate of the polybutene measured at 190°C and a load of 2.16 kg is 0.31 g / 10 min, 0.32 g / 10 min, 0.33 g / 10 min, 0.34 g / 10 min, 0.35 g / 10 min, 0.36 g / 10 min, 0.37 g / 10 min, 0.38 g / 10 min, 0.39 g / 10 min, 0.40 g / 10 min, 0.41 g / 10min, 0.42g / 10min, 0.43g / 10min, 0.44g / 10min, 0.45g / 10min, 0.46g / 10min, 0.47g / 10min, 0 .48g / 10min, 0.49g / 10min, 0.50g / 10min, 0.51g / 10min, 0.52g / 10min, 0.53g / 10min, 0.54g / 10min ,0.55g / 10min, 0.56g / 10min, 0.57g / 10min, 0.58g / 10min, 0.59g / 10min, 0.60g / 10min, 0.61g / 10 min, 0.62g / 10min, 0.63g / 10min, 0.64g / 10min, 0.65g / 10min, 0.66g / 10min, 0.67g / 10min, 0.68g / The present invention relates to a range value of one or any two of the following: 10 min, 0.69 g / 10 min, 0.70 g / 10 min, 0.71 g / 10 min, 0.72 g / 10 min, 0.73 g / 10 min, 0.74 g / 10 min, 0.75 g / 10 min, 0.76 g / 10 min, 0.77 g / 10 min, 0.78 g / 10 min, 0.79 g / 10 min, and 0.80 g / 10 min.

[0026] More preferably, the polybutene has a melt flow rate of 0.4-0.7 g / 10 min, specifically 0.42-0.63 g / 10 min, measured at 190° C. and a load of 2.16 kg.

[0027] More preferably, the polybutene has a melt flow rate of 0.5-0.6 g / 10 min measured at 190° C. and a load of 2.16 kg.

[0028] In the present invention, the melt flow rate (melt mass flow rate) of the polybutene can be measured according to GB / T 3682-2000.

[0029] In a second aspect, the present invention provides a method for preparing a polybutene composition, comprising:

[0030] The components are mixed to obtain a polybutene composition.

[0031] In a third aspect, the present invention provides an application of a polybutene composition in a polybutene pipe.

[0032] In a fourth aspect, the present invention provides a method for preparing a polybutene pipe, comprising the following steps:

[0033] S1. The polybutene composition is granulated and extruded to obtain an initial pipe;

[0034] S2. Apply a pressure of 1-4 MPa to the initial pipe to obtain a polybutylene pipe.

[0035] Preferably, in step S1, the granulation temperature is 150-200°C.

[0036] Preferably, in step S1, the extrusion temperature is 150-180°C.

[0037] Preferably, in step S2, the applied pressure is a range value of one or any two of 1 MPa, 1.2 MPa, 1.5 MPa, 1.7 MPa, 2 MPa, 2.2 MPa, 2.5 MPa, 2.7 MPa, 3 MPa, 3.2 MPa, 3.5 MPa, 3.7 MPa, and 4 MPa.

[0038] More preferably, in step S2, the applied pressure is 2-3 MPa.

[0039] Preferably, in step S2, the time for applying pressure to the initial pipe is 1-24 hours.

[0040] More preferably, in step S2, the time for applying pressure to the initial pipe is a range of one or any two of 1h, 2h, 3h, 4h, 5h, 6h, 7h, 8h, 9h, 10h, 11h, 12h, 13h, 14h, 15h, 16h, 17h, 18h, 19h, 20h, 21h, 22h, 23h, and 24h.

[0041] More preferably, in step S2, the time for applying pressure to the initial pipe is 1-12 hours, specifically 2-12 hours, more specifically 2-8 hours.

[0042] Preferably, in step S2, the temperature at which pressure is applied to the initial pipe is 15-30°C.

[0043] Preferably, in step S2, applying pressure to the initial pipe is performed in a liquid environment.

[0044] More preferably, the liquid environment is water.

[0045] Preferably, in step S2, after applying pressure to the initial pipe, the process further includes allowing the pipe to stand.

[0046] More preferably, the temperature of the static state is 20-25° C., and the pressure of the static state is 100-105 kPa.

[0047] More preferably, the standing time is 1-24 hours.

[0048] More preferably, the standing time is a range value of one or any two of 1h, 2h, 3h, 4h, 5h, 6h, 7h, 8h, 9h, 10h, 11h, 12h, 13h, 14h, 15h, 16h, 17h, 18h, 19h, 20h, 21h, 22h, 23h, and 24h.

[0049] More preferably, the standing time is 1-23 hours, specifically 12-22 hours, more specifically 16-22 hours.

[0050] In a fifth aspect, the present invention provides a polybutene pipe prepared by the preparation method described in the fourth aspect.

[0051] Preferably, the polybutylene tube has an outer diameter of 16-32 mm and a thickness of 2.0-4.0 mm.

[0052] More preferably, the polybutylene tube has an outer diameter of 16-16.3 mm and a thickness of 2.0-2.2 mm.

[0053] Compared with the prior art, the present invention has the following beneficial effects:

[0054] In the present invention, by selecting phthalylglycine, N1,N4 dicyclohexyl terephthalamide, and 2,2'-methylene-bis(4,6-di-tert-butylphenyl phosphate) basic aluminum in a specific weight ratio as nucleating agents, not only can the polybutene pipe quickly reach the maximum ring stiffness, but also the maximum ring stiffness of the polybutene pipe can be improved.

[0055] Specifically, when phthalylglycine, N1,N4 dicyclohexyl terephthalamide, and 2,2'-methylene-bis(4,6-di-tert-butylphenyl phosphate) basic aluminum in a specific weight ratio are used as nucleating agents, the compatibility between the nucleating agent and polybutene can be improved, fine grains can be formed, heterogeneous nucleation can be promoted, and the melt viscosity of polybutene can be reduced, thereby improving the nucleation effect of polybutene and accelerating the transformation of polybutene from metastable crystal form II to stable crystal form I, so that the polybutene pipe prepared using the polybutene composition can quickly reach the maximum ring stiffness.

[0056] In addition, 2,2'-methylene-bis(4,6-di-tert-butylphenyl phosphate) basic aluminum has a high melting point, which can refine the grains and improve the crystallinity. At the same time, it can also increase the orderly arrangement of the molecular segments of polybutene, which is beneficial to improving the maximum ring stiffness of the polybutene pipe. Phthaloylglycine and N1,N4 dicyclohexyl terephthalamide have good dispersibility in the polybutene melt, which can make the grains more evenly distributed in the melt, increase the crystallization rate, and be beneficial to quickly and stabilizing the orderly arrangement of the molecular segments of polybutene, thereby improving the maximum ring stiffness of the polybutene pipe. DETAILED DESCRIPTION

[0057] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0058] The experimental methods in the following Examples, Comparative Examples, Application Examples, and Comparative Application Examples where specific conditions are not specified are generally based on conventional conditions in the art or conditions recommended by the manufacturer; the raw materials and reagents used, unless otherwise specified, are all raw materials and reagents that can be obtained from commercial channels such as conventional markets.

[0059] In the various embodiments and comparative examples of the present invention, the use of reagents is as follows:

[0060] Polybutene A, P5250N, Mitsui Chemicals, Japan, with a melt flow rate of 0.56 g / 10 min at 190°C and a load of 2.16 kg;

[0061] Polybutene B, PB4238, LyondellBasell, melt flow rate measured at 190°C and 2.16 kg load: 0.42 g / 10 min;

[0062] Polybutene C, PB4235-1, LyondellBasell, melt flow rate measured at 190°C and 2.16 kg load is 0.63 g / 10 min;

[0063] Phthaloylglycine, CAS number: 4702-13-0;

[0064] N1,N4 dicyclohexyl terephthalamide, CAS number: 15088-29-6;

[0065] 2,2'-Methylene-bis(4,6-di-tert-butylphenyl phosphate)aluminum hydroxide, CAS No. 151841-65-5;

[0066] N-cyclohexyl-4-methylbenzamide, CAS number: 53205-68-8;

[0067] PP wax (polypropylene wax), PP2502, Clariant, Germany;

[0068] Paraffin wax, CAS number: 8002-74-2;

[0069] Zinc stearate, CAS number: 557-05-1.

[0070] In the present invention, the melt flow rate (melt mass flow rate) of the polybutene can be measured according to GB / T 3682-2000.

[0071] Example 1

[0072] This embodiment provides a polybutene composition, which comprises the following components in parts by weight:

[0073] 100 parts of polybutene A, 0.3 parts of nucleating agent, 1 part of lubricant;

[0074] The nucleating agent contains phthalylglycine, N1,N4 dicyclohexyl terephthalamide, and 2,2'-methylene-bis(4,6-di-tert-butylphenyl phosphate) basic aluminum in a weight ratio of 1:3:2;

[0075] The lubricant is zinc stearate and PP wax in a weight ratio of 1:4;

[0076] The preparation method of the polybutene composition comprises:

[0077] The components were mixed for 15 minutes to obtain a polybutene composition.

[0078] Examples 2-9 and Comparative Examples 1-8

[0079] Examples 2-9 and Comparative Examples 1-8 provide different polybutene compositions, which differ from Example 1 in that the weight ratios of the components in the nucleating agent are different. The rest are consistent with Example 1, as shown in the following table:

[0080] Table 1 Weight ratio of each component in the nucleating agent of Examples 1-9 and Comparative Examples 1-8

[0081]

[0082] Comparative Example 9

[0083] This comparative example provides a polybutene composition, which differs from Example 1 in that N-cyclohexyl-4-methylbenzamide is used instead of N1,N4 dicyclohexyl terephthalamide, and the rest is the same as Example 1.

[0084] Examples 10-11 and Comparative Examples 10-11

[0085] Examples 10-11 and Comparative Examples 10-11 provide different polybutene compositions, which differ from Example 1 in that the weight fractions of the nucleating agent are different. The rest are consistent with Example 1, as shown in the following table:

[0086] Table 2 Weight parts of nucleating agents of Examples 1, 10-11 and Comparative Examples 10-11

[0087]

[0088] Examples 12-13 and Comparative Examples 12-13

[0089] Examples 12-13 and Comparative Examples 12-13 provide different polybutene compositions, which differ from Example 1 in that the weight fractions of the lubricant are different. The rest are consistent with Example 1, as shown in the following table:

[0090] Table 3 Parts by weight of lubricants of Examples 1, 12-13 and Comparative Examples 12-13

[0091]

[0092] Examples 14-19

[0093] Examples 14-19 provide different polybutene compositions, which differ from Example 1 in that the weight ratios of the components in the lubricant are different. The rest are consistent with Example 1, as shown in the following table:

[0094] Table 4 Weight ratio of each component in the lubricant of Examples 1, 14-19

[0095]

[0096] Example 20

[0097] This embodiment provides a polybutene composition, which differs from Example 1 in that paraffin wax is used instead of PP wax, and the rest is the same as Example 1.

[0098] Examples 21-22

[0099] Examples 21-22 provide different polybutene compositions, which differ from Example 1 in that the types of polybutene are different. The rest are consistent with Example 1, as shown in the following table:

[0100] Table 5 Polybutene types of Examples 1, 21-22

[0101]

[0102] Application Examples and Comparative Application Examples

[0103] Application Example 1

[0104] This application example provides a polybutene pipe, and its preparation method includes the following steps:

[0105] S1. The polybutene composition of Example 1 was granulated using a parallel co-rotating twin-screw granulator at 180 ° C and then extruded at 165 ° C to obtain an initial pipe;

[0106] S2. Apply a pressure of 2 MPa to the initial pipe in a liquid (water) environment at 25°C for 2 hours, followed by allowing it to stand at 25°C and 101 kPa for 22 hours to obtain a polybutylene pipe.

[0107] The outer diameter of the polybutylene tube is 16.15±0.15 mm and the thickness is 2.1 mm.

[0108] Application Example 2-22

[0109] Application Examples 2-22 provide different polybutene pipes. The difference between them and Application Example 1 is that Application Examples 2-22 use the polybutene compositions of Examples 2-22 instead of the polybutene composition of Example 1, and the rest are consistent with Application Example 1.

[0110] Application Examples 23-30

[0111] Application Examples 23-30 provide different polybutylene pipes. The difference between them and Application Example 1 is that the pressure applied to the initial pipe in step S2, the time for applying pressure to the initial pipe, and the time for standing are different. The rest are consistent with Application Example 1, as shown in the following table:

[0112] Table 6 Experimental parameters in the preparation method of polybutene pipes in application examples 1, 23-30

[0113]

[0114] In the above table, application example 27 is that no pressure is applied to the initial pipe and it is left to stand for 24 hours.

[0115] Comparative Application Examples 1-13

[0116] Comparative Application Examples 1-13 provide different polybutene pipes. The difference between them and Application Example 1 is that Comparative Application Examples 1-13 use the polybutene compositions of Comparative Examples 1-13 instead of the polybutene composition of Example 1, and the rest are consistent with Application Example 1.

[0117] Performance Testing

[0118] The following performance tests were conducted on the polybutylene pipes of each application example and comparative application example:

[0119] (1) Ring stiffness test

[0120] With reference to the national standard GB / T 9647-2015, at room temperature, the ring stiffness is calculated based on the load when the test pipe (polybutylene pipe) is deformed by 3% in the diameter direction. The ring stiffness of the polybutylene pipe of each application example or comparison application example is tested every 8 hours.

[0121] The “maximum ring stiffness” refers to the ring stiffness of the polybutylene pipe when the ring stiffness no longer increases with time. The maximum ring stiffness is ≥60kN / m 2 is the eligibility standard;

[0122] "Time required to reach maximum ring stiffness" refers to the time required for the polybutylene pipe to reach maximum ring stiffness, which is based on the time when the polybutylene pipe is just prepared;

[0123] (2) Hydrostatic test

[0124] With reference to the national standard GB / T 19473.2-2004, the polybutylene pipes of each application example or comparative application example were first subjected to a hydrostatic test at 20°C and 15.5 MPa hoop stress for 1 hour. If the polybutylene pipe did not rupture, it passed the hydrostatic test.

[0125] The experimental results are shown in the following table:

[0126] Table 7 Performance test results of polybutylene pipes in various application examples and comparative application examples

[0127]

[0128]

[0129]

[0130] As can be seen from Table 7, in the present invention, by selecting phthaloylglycine, N1,N4 dicyclohexylterephthalamide, and 2,2'-methylene-bis(4,6-di-tert-butylphenyl phosphate) basic aluminum in a specific weight ratio as nucleating agents, not only can the polybutene pipe quickly reach the maximum ring stiffness, but also the maximum ring stiffness of the polybutene pipe can be improved.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A polybutene composition that enables a polybutene pipe to quickly reach maximum ring stiffness, characterized in that: Calculated by weight, it includes the following components: 100 parts of polybutene, 0.1-1 parts of nucleating agent, 0.2-1.2 parts of lubricant; wherein the nucleating agent contains phthalylglycine, N1,N4 dicyclohexyl terephthalamide, and 2,2'-methylene-bis(4,6-di-tert-butylphenyl phosphate) basic aluminum in a weight ratio of 1:(1-5):(1-5); The lubricant is zinc stearate and PP wax in a weight ratio of 1:(1-8); or, the lubricant is zinc stearate and paraffin wax in a weight ratio of 1:(1-8).

2. The polybutene composition according to claim 1, wherein Include at least one of the following (1)-(2): (1) The nucleating agent contains phthalylglycine, N1,N4 dicyclohexyl terephthalamide, and 2,2'-methylene-bis(4,6-di-tert-butylphenyl phosphate) basic aluminum in a weight ratio of 1:(2-4):(1.5-3); (2) The melt flow rate of the polybutene measured at 190° C. and a load of 2.16 kg is 0.3-0.8 g / 10 min.

3. The polybutene composition according to claim 2, wherein The melt flow rate of the polybutene measured at 190° C. and a load of 2.16 kg is 0.4-0.7 g / 10 min.

4. The polybutene composition according to claim 1, wherein The lubricant is zinc stearate and PP wax in a weight ratio of 1:(2-5); Alternatively, the lubricant is zinc stearate and paraffin in a weight ratio of 1:(2-5).

5. Use of the polybutene composition according to any one of claims 1 to 4 in polybutene pipes.

6. A method for preparing a polybutene pipe, characterized in that: The steps include: S1. The polybutene composition according to any one of claims 1-4 is granulated and extruded to obtain an initial pipe; S2. Apply a pressure of 1-4 MPa to the initial pipe and let it stand to obtain a polybutylene pipe; In step S2, the time for applying pressure to the initial pipe is 1-24 hours; In step S2, the standing time is 1-24 hours.

7. The method for preparing a polybutene pipe according to claim 6, wherein: Include at least one of the following (1)-(4): (1) In step S2, the applied pressure is 2-3 MPa; (2) In step S2, applying pressure to the initial pipe is performed in a liquid environment; (3) In step S2, the time for applying pressure to the initial pipe is 1-12 hours; (4) The temperature of the static state is 20-25°C, and the pressure of the static state is 100-105 kPa.

8. The method for preparing a polybutene pipe according to claim 7, wherein: The liquid environment is water.

9. The method for preparing a polybutene pipe according to claim 6, wherein: Include at least one of the following (1)-(3): (1) In step S1, the granulation temperature is 150-200°C; (2) In step S1, the extrusion temperature is 150-180°C; (3) In step S2, the temperature at which pressure is applied to the initial pipe is 15-30°C.

10. A polybutene pipe, characterized in that: The product is prepared by the preparation method according to any one of claims 6 to 9.

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