Polybutylene composition, application of polybutylene composition, polybutylene pipe and preparation method of polybutylene pipe

Abstract

The invention relates to the technical field of materials, and discloses a polybutylene composition and application thereof, a polybutylene pipe and a preparation method thereof, the polybutylene composition comprises the following components by weight: 100 parts of polybutylene, 0.1-1 part of a nucleating agent, and 0.2-1.2 parts of a lubricant; wherein the nucleating agent is prepared from phthaloyl glycine, N1, N4 dicyclohexyl terephthalamide and 2, 2 '-methylene-bis (4, 6-di-tert-butyl phenyl phosphate) basic aluminum according to the weight ratio of 1 to (1 to 5) to (1 to 5). According to the invention, the phthaloyl glycine, the N1, N4 dicyclohexyl terephthalamide and the 2, 2 '-methylene-bis (4, 6-di-tert-butyl phenyl phosphate) basic aluminum in a specific weight ratio are selected as the nucleating agent, so that not only can the polybutylene pipe rapidly reach the maximum ring stiffness, but also the maximum ring stiffness of the polybutylene pipe can be improved.

Description

Technical Field

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

[0002] Polybutene (PB) pipes have high temperature and pressure resistance, chemical stability, plasticity and durability. The material itself is non-toxic, odorless and tasteless, and is mainly used in the fields of cold and hot water supply, heating and hot spring pipes, industry and agriculture, etc. However, during the processing, the crystal structure of the freshly extruded polybutene pipe is the metastable crystal form II. At this time, the ring stiffness of the polybutene pipe has not reached its maximum value. Subsequently, the crystal form II will slowly transform into the stable crystal form I, making the ring stiffness of the polybutene pipe reach the maximum value. This crystallization transformation process usually takes 5 days, resulting in an extended production cycle and increased production cost of the polybutene pipe.

[0003] In addition, since the maximum ring stiffness of the polybutene pipe refers to the maximum circumferential deformation ability that the pipe can withstand when subjected to external forces, and it is an important indicator for measuring the compressive and pressure resistance performance of the pipe, improving the maximum ring stiffness of the polybutene pipe can enhance the structural stability of the pipeline, enabling the polybutene pipe to better resist external pressure deformation and meet different engineering requirements.

[0004] Therefore, developing a polybutene composition that can enable the 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 deficiency that the polybutene pipe in the prior art cannot quickly reach the maximum ring stiffness, and to improve the maximum ring stiffness of the polybutene pipe, and to provide a polybutene composition and its application, a polybutene pipe and a preparation method thereof.

[0006] To achieve the above purpose, the technical solutions adopted by the present invention are as follows: In the first aspect, the present invention provides a polybutene composition, which includes the following components by weight: 100 parts of polybutene, 0.1 - 1 part of nucleating agent, 0.2 - 1.2 parts of lubricant; Wherein, the nucleating agent contains phthalylglycine, N1,N4 - dicyclohexyl terephthalamide, and basic aluminum 2,2'-methylenebis(4,6 - di - tert - butylphenyl phosphate) in a weight ratio of 1:(1 - 5):(1 - 5).

[0007] In the present invention, by selecting phthaloylglycine, N1,N4-dicyclohexyl terephthalamide, and basic aluminum 2,2'-methylenebis(4,6-di-tert-butylphenyl phosphate) as nucleating agents in a specific weight ratio, 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.

[0008] Specifically, when phthaloylglycine, N1,N4-dicyclohexyl terephthalamide, and basic aluminum 2,2'-methylenebis(4,6-di-tert-butylphenyl phosphate) 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, the melt viscosity of polybutene can be reduced, thereby improving the nucleation effect of polybutene, accelerating the transformation of polybutene from the metastable crystal form II to the stable crystal form I, and enabling the polybutene pipe prepared from the polybutene composition to quickly reach the maximum ring stiffness.

[0009] In addition, basic aluminum 2,2'-methylenebis(4,6-di-tert-butylphenyl phosphate) has a relatively high melting point, which can refine the grains and increase the crystallinity. At the same time, it can also increase the degree of ordered arrangement of the molecular chain segments of polybutene, which is beneficial to improving the maximum ring stiffness of the polybutene pipe; while phthaloylglycine and N1,N4-dicyclohexyl terephthalamide have good dispersibility in the polybutene melt, which can make the grains more evenly distributed in the melt, improve the crystallization rate, and is beneficial to quickly stabilizing the ordered arrangement of the molecular chain segments of polybutene, thereby improving the maximum ring stiffness of the polybutene pipe.

[0010] Preferably, the weight ratio of the phthaloylglycine, N1,N4-dicyclohexyl terephthalamide, and basic aluminum 2,2'-methylenebis(4,6-di-tert-butylphenyl phosphate) is one of 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, 1:1:1.5, 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, 1:5:5 or the range value of any two of them.

[0011] More preferably, the nucleating agent contains phthaloylglycine, N1,N4-dicyclohexyl terephthalamide, and basic aluminum 2,2'-methylenebis(4,6-di-tert-butylphenyl phosphate) in a weight ratio of 1:(2 - 4):(1.5 - 3).

[0012] More preferably, the weight ratio of phthalylglycine, N1,N4-dicyclohexyl terephthalamide, and basic aluminum 2,2'-methylene-bis(4,6-di-tert-butylphenyl phosphate) is 1:3:2.

[0013] Preferably, the lubricant is at least one of PE wax (polyethylene wax), PP wax (polypropylene wax), paraffin wax, zinc stearate, and glyceryl tristearate.

[0014] More preferably, the lubricant is zinc stearate and PP wax (polypropylene wax) with a weight ratio of 1:(1-8).

[0015] Even more preferably, the weight ratio of zinc stearate and PP wax (polypropylene wax) is one of or any range value between any two of 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.

[0016] Even more preferably, the lubricant is zinc stearate and PP wax (polypropylene wax) with a weight ratio of 1:(2-5).

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

[0018] Even more preferably, the weight ratio of zinc stearate and paraffin wax is one of or any range value between any two of 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.

[0019] Even more preferably, the lubricant is zinc stearate and paraffin wax with a weight ratio of 1:(2-5).

[0020] Common polybutenes in the art can all be used in the present invention.

[0021] Preferably, the melt flow rate of the polybutene measured under the conditions of 190°C and a load of 2.16 kg is 0.3-0.8 g / 10 min.

[0022] More preferably, the melt flow rate of the polybutene measured under the conditions of 190 °C and a load of 2.16 kg is one of 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 / 10 min, 0.42 g / 10 min, 0.43 g / 10 min, 0.44 g / 10 min, 0.45 g / 10 min, 0.46 g / 10 min, 0.47 g / 10 min, 0.48 g / 10 min, 0.49 g / 10 min, 0.50 g / 10 min, 0.51 g / 10 min, 0.52 g / 10 min, 0.53 g / 10 min, 0.54 g / 10 min, 0.55 g / 10 min, 0.56 g / 10 min, 0.57 g / 10 min, 0.58 g / 10 min, 0.59 g / 10 min, 0.60 g / 10 min, 0.61 g / 10 min, 0.62 g / 10 min, 0.63 g / 10 min, 0.64 g / 10 min, 0.65 g / 10 min, 0.66 g / 10 min, 0.67 g / 10 min, 0.68 g / 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, 0.80 g / 10 min or a range value of any two of them.

[0023] Even more preferably, the melt flow rate of the polybutene measured under the conditions of 190 °C and a load of 2.16 kg is 0.4 - 0.7 g / 10 min, specifically 0.42 - 0.63 g / 10 min.

[0024] Even more preferably, the melt flow rate of the polybutene measured under the conditions of 190 °C and a load of 2.16 kg is 0.5 - 0.6 g / 10 min.

[0025] In the present invention, the melt flow rate (melt mass flow rate) of the polybutene can be measured in accordance with GB / T 3682 - 2000.

[0026] In a second aspect, the present invention provides a method for preparing a polybutene composition, comprising: Mixing each component to obtain the polybutene composition.

[0027] In a third aspect, the present invention provides an application of a polybutene composition in polybutene pipes.

[0028] In a fourth aspect, the present invention provides a method for preparing a polybutene pipe, comprising the following steps: S1. Granulate and extrude the polybutene composition to obtain an initial pipe; S2. Apply a pressure of 1 - 4 MPa to the initial pipe to obtain the polybutene pipe.

[0029] Preferably, in step S1, the temperature of the granulation is 150 - 200 °C.

[0030] Preferably, in step S1, the temperature of the extrusion is 150 - 180 °C.

[0031] Preferably, in step S2, the applied pressure is one 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, 4 MPa or a range value between any two of them.

[0032] More preferably, in step S2, the applied pressure is 2 - 3 MPa.

[0033] Preferably, in step S2, the time for applying the pressure to the initial pipe is 1 - 24 h.

[0034] More preferably, in step S2, the time for applying the pressure to the initial pipe is one of 1 h, 2 h, 3 h, 4 h, 5 h, 6 h, 7 h, 8 h, 9 h, 10 h, 11 h, 12 h, 13 h, 14 h, 15 h, 16 h, 17 h, 18 h, 19 h, 20 h, 21 h, 22 h, 23 h, 24 h or a range value between any two of them.

[0035] Even more preferably, in step S2, the time for applying the pressure to the initial pipe is 1 - 12 h, specifically 2 - 12 h, and more specifically 2 - 8 h.

[0036] Preferably, in step S2, the temperature for applying the pressure to the initial pipe is 15 - 30 °C.

[0037] Preferably, in step S2, the application of the pressure to the initial pipe is carried out in a liquid environment.

[0038] More preferably, the liquid environment is water.

[0039] Preferably, after applying the pressure to the initial pipe in step S2, it further includes standing still.

[0040] More preferably, the temperature of the static placement is 20-25°C, and the pressure of the static placement is 100-105 kPa.

[0041] More preferably, the time of the static placement is 1-24 h.

[0042] Even more preferably, the time of the static placement is one of 1 h, 2 h, 3 h, 4 h, 5 h, 6 h, 7 h, 8 h, 9 h, 10 h, 11 h, 12 h, 13 h, 14 h, 15 h, 16 h, 17 h, 18 h, 19 h, 20 h, 21 h, 22 h, 23 h, 24 h or the range value of any two of them.

[0043] Even more preferably, the time of the static placement is 1-23 h, specifically 12-22 h, and more specifically 16-22 h.

[0044] In the fifth aspect, the present invention provides a polybutene pipe prepared by using the preparation method described in the fourth aspect.

[0045] Preferably, the outer diameter of the polybutene pipe is 16-32 mm, and the thickness is 2.0-4.0 mm.

[0046] More preferably, the outer diameter of the polybutene pipe is 16-16.3 mm, and the thickness is 2.0-2.2 mm.

[0047] Compared with the prior art, the beneficial effects of the present invention are as follows: In the present invention, by selecting phthalylglycine, N1,N4-dicyclohexyl terephthalamide, and basic aluminum 2,2'-methylenebis(4,6-di-tert-butylphenyl phosphate) as nucleating agents in a specific weight ratio, 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.

[0048] Specifically, when phthalylglycine, N1,N4-dicyclohexyl terephthalamide, and basic aluminum 2,2'-methylenebis(4,6-di-tert-butylphenyl phosphate) are used as nucleating agents in a specific weight ratio, the compatibility between the nucleating agent and polybutene can be improved, fine grains can be formed, heterogeneous nucleation can be promoted, the melt viscosity of polybutene can be reduced, thereby improving the nucleation effect of polybutene, accelerating the transformation of polybutene from metastable crystal form II to stable crystal form I, and enabling the polybutene pipe prepared from the polybutene composition to quickly reach the maximum ring stiffness.

[0049] In addition, 2,2'-methylene-bis(4,6-di-tert-butylphenyl phosphate) basic aluminum has a relatively high melting point, which can refine the crystal grains, increase the crystallinity, and at the same time increase the degree of ordered arrangement of the molecular chain segments of polybutene, which is beneficial to improving the maximum ring stiffness of polybutene pipes; while phthaloylglycine and N1,N4-dicyclohexyl terephthalamide have good dispersibility in the polybutene melt, which can make the crystal grains more evenly distributed in the melt, improve the crystallization rate, and is beneficial to quickly and stably arrange the molecular chain segments of polybutene in an orderly manner, thereby improving the maximum ring stiffness of polybutene pipes. Detailed implementation manners

[0050] 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.

[0051] For the experimental methods without specific conditions in the following examples, comparative examples, application examples, and comparative application examples, they are usually carried out according to the conventional conditions in the art or according to the conditions recommended by the manufacturer; the raw materials, reagents, etc. used, unless otherwise specified, are all raw materials and reagents that can be obtained from commercial channels such as conventional markets.

[0052] In the embodiments and comparative examples of the present invention, the usage of reagents is as follows: Polybutene A, P5250N, Mitsui Chemicals, Japan, with a melt flow rate of 0.56 g / 10 min measured under the conditions of 190 °C and a load of 2.16 kg; Polybutene B, PB4238, LyondellBasell, with a melt flow rate of 0.42 g / 10 min measured under the conditions of 190 °C and a load of 2.16 kg; Polybutene C, PB4235-1, LyondellBasell, with a melt flow rate of 0.63 g / 10 min measured under the conditions of 190 °C and a load of 2.16 kg; Phthaloylglycine, CAS No.: 4702-13-0; N1,N4-Dicyclohexyl terephthalamide, CAS No.: 15088-29-6; 2,2'-Methylene-bis(4,6-di-tert-butylphenyl phosphate) basic aluminum, CAS No.: 151841-65-5; N-Cyclohexyl-4-methylbenzamide, CAS No.: 53205-68-8; PP wax (polypropylene wax), PP2502, Clariant, Germany; Paraffin wax, CAS No.: 8002-74-2; Zinc stearate, CAS No.: 557-05-1.

[0053] In the present invention, the melt flow rate (melt mass flow rate) of the polybutene can be measured according to GB / T 3682-2000.

[0054] Example 1 This embodiment provides a polybutene composition, which comprises the following components in parts by weight: 100 parts of polybutene A, 0.3 parts of nucleating agent, 1 part of lubricant; Wherein, 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 1:3:2; The lubricant is zinc stearate and PP wax in a weight ratio of 1:4; The method for preparing the polybutene composition comprises: The components were mixed for 15 minutes to obtain a polybutene composition.

[0055] Examples 2-9 and Comparative Examples 1-8 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, and the rest are consistent with Example 1, as shown in the following table: Table 1 Weight ratio of each component in the nucleating agent of Examples 1-9 and Comparative Examples 1-8 Comparative Example 9 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 consistent with Example 1.

[0056] Examples 10-11 and Comparative Examples 10-11 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, and the rest are consistent with Example 1, as shown in the following table: Table 2 Weight fractions of nucleating agents of Examples 1, 10-11 and Comparative Examples 10-11 Examples 12-13 and Comparative Examples 12-13 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, and the rest are consistent with Example 1, as shown in the following table: Table 3 Weight parts of lubricants of Examples 1, 12-13 and Comparative Examples 12-13 Examples 14 - 19 Examples 14 - 19 provide different polybutene compositions, which are different from Example 1 in that the weight ratios of the components in the lubricant are different, and the rest are the same as those in Example 1, as shown in the following table: Table 4 Weight ratios of the components in the lubricants of Examples 1, 14 - 19 Example 20 This example provides a polybutene composition, which is different from Example 1 in that paraffin is used instead of PP wax, and the rest are the same as those in Example 1.

[0057] Examples 21 - 22 Examples 21 - 22 provide different polybutene compositions, which are different from Example 1 in that the types of polybutene are different, and the rest are the same as those in Example 1, as shown in the following table: Table 5 Types of polybutene in Examples 1, 21 - 22 Application Examples and Comparative Application Examples Application Example 1 This application example provides a polybutene pipe, and its preparation method includes the following steps: S1. At 180 °C, granulate the polybutene composition of Example 1 with a co - rotating twin - screw granulator, and then extrude it at 165 °C to obtain the initial pipe; S2. At 25 °C, apply a pressure of 2 MPa for 2 h to the initial pipe in a liquid (water) environment, and then let it stand for 22 h at 25 °C and 101 kPa to obtain the polybutene pipe; The outer diameter of the polybutene pipe is 16.15 ± 0.15 mm, and the thickness is 2.1 mm.

[0058] Application Examples 2 - 22 Application Examples 2 - 22 provide different polybutene pipes, which are different from Application Example 1 in that the polybutene compositions of Examples 2 - 22 are used to replace the polybutene composition of Example 1 respectively, and the rest are the same as those in Application Example 1.

[0059] Application Examples 23 - 30 Application Examples 23 - 30 provide different polybutene pipes, which are different from Application Example 1 in that the magnitude of the pressure applied to the initial pipe, the time of applying pressure to the initial pipe, and the standing time in step S2 are different, and the rest are the same as those in Application Example 1, as shown in the following table: Table 6 Experimental parameters in the preparation method of polybutene pipes in Application Example 1, 23 - 30 In the above table, for Application Example 27, no pressure was applied to the initial pipe material, and it was directly left standing for 24 h.

[0060] Comparative Application Examples 1 - 13 Comparative Application Examples 1 - 13 provide different polybutene pipes. The difference from Application Example 1 is that in Comparative Application Examples 1 - 13, the polybutene compositions of Comparative Examples 1 - 13 are used to replace the polybutene composition of Example 1, and the rest are the same as Application Example 1.

[0061] Performance Test The following performance tests were carried out on the polybutene pipes of each application example and comparative application example: (1) Ring stiffness test Referring to the national standard GB / T 9647 - 2015, at room temperature, the ring stiffness was calculated based on the load when the deformation amount of the test pipe (polybutene pipe) in the diameter direction was 3%. The ring stiffness of the polybutene pipes of each application example or comparative application example was tested every 8 h.

[0062] Among them, the "maximum ring stiffness" refers to the ring stiffness when the ring stiffness of the polybutene pipe no longer increases with time, and the maximum ring stiffness ≥ 60 kN / m 2 is the qualified standard; The "time required to reach the maximum ring stiffness" refers to the time required for the polybutene pipe to reach the maximum ring stiffness, starting from the time when the polybutene pipe was just prepared; (2) Hydrostatic test Referring to the national standard GB / T 19473.2 - 2004, first, a 1 - h hydrostatic test was carried out on the polybutene pipes of each application example or comparative application example under the conditions of 20 °C and a hoop stress of 15.5 MPa. If the polybutene pipe does not rupture, it passes the hydrostatic test; The experimental results are shown in the following table: Table 7 Performance test results of polybutene pipes of each application example and comparative application example As can be seen from Table 7, in the present invention, by selecting phthalylglycine, N1,N4 - dicyclohexyl terephthalamide, and basic aluminum 2,2'-methylenebis(4,6 - di - tert - butylphenyl phosphate) as nucleating agents in a specific weight ratio, 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.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A polybutene composition, 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; 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:(1-5):(1-5).

2. The polybutene composition according to claim 1, characterized in that Include at least one of the following (1)-(3): (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 lubricant is at least one of PE wax, PP wax, paraffin wax, zinc stearate, and tristearic acid glyceryl; (3) 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, characterized in that The lubricant is zinc stearate and PP wax in a weight ratio of 1:(1-8); Or, the lubricant is zinc stearate and paraffin in a weight ratio of 1:(1-8); And / or, the polybutene has a melt flow rate of 0.4-0.7 g / 10 min measured at 190° C. and a load of 2.16 kg.

4. The polybutene composition according to claim 3, characterized in that 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. Granulating and extruding the polybutene composition according to any one of claims 1 to 4 to obtain an initial pipe; S2. Apply a pressure of 1-4 MPa to the initial pipe to obtain a polybutylene pipe.

7. The method for preparing a polybutene pipe according to claim 6, characterized in that: Include at least one of the following (1)-(4): (1) In step S2, the applied pressure is 2-3 MPa; (2) In step S2, the time for applying pressure to the initial pipe is 1-24 hours; (3) In step S2, after applying pressure to the initial pipe, the process further includes allowing the pipe to stand still; (4) In step S2, the step of applying pressure to the initial pipe is performed in a liquid environment.

8. The method for preparing a polybutene pipe according to claim 7, characterized in that: Include at least one of the following (1)-(4): (1) In step S2, the time for applying pressure to the initial pipe is 1-12 hours; (2) The temperature of the static state is 20-25°C, and the pressure of the static state is 100-105 kPa; (3) The standing time is 1-24 hours; (4) The liquid environment is water.

9. The method for preparing a polybutene pipe according to claim 6, characterized in that: 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 described in any one of claims 6 to 9.

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