Preparation method of high-rigidity oxygen-barrier smooth PP-R composite pipe

Abstract

The present application belongs to the technical field of pipe material, and particularly relates to a preparation method of high-rigidity oxygen-resistant smooth PP-R composite pipe. In view of the problem that the performance of the pipe material in the prior art needs to be improved, the present application provides a preparation method of high-rigidity oxygen-resistant smooth PP-R composite pipe, which comprises a preparation step of glass fiber / USM / PP-R intercalation composite material, a preparation step of wollastonite fiber / USM / PP-R intercalation composite material, a PP-R composite material preparation step and a pipe material preparation step. By arranging the wollastonite fiber / USM / PP-R intercalation composite material layer in the fiber composite PP-R pipe material, the problem of the pipe material inner surface not being smooth enough due to the glass fiber layer is offset, and the low water resistance of the PP-R inner layer is maintained while the pipe material rigidity is ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of pipe materials, and particularly relates to a preparation method of a high-rigidity oxygen-resistant smooth PP-R composite pipe. BACKGROUND

[0002] The existing PP-R pipe material has a high linear expansion coefficient and insufficient rigidity, and is greatly deformed under the action of heat and self weight. Some manufacturers have introduced three-layer glass fiber composite PP-R pipes to solve this problem, but to achieve ideal rigidity and low linear expansion coefficient, it is necessary to first ensure that the glass fiber has a certain length, which will cause the inner surface of the pipe material to be uneven after extrusion, increase the water resistance of the inner wall of the pipe material, and sacrifice the transmission efficiency of the pipe. In addition, the conventional glass fiber composite PP-R or PP-R pipe material does not have good oxygen resistance, and the penetration of oxygen in the air into the inner wall of the pipe material is easy to breed bacteria and scale, and the uneven inner surface of the glass fiber pipe is more prone to accumulate dirt, further increasing the water resistance of the inner wall of the pipe material, and causing the water body to be polluted, which is not conducive to health when used to transport drinking water. Finally, in the case of transporting hot water or industrial raw materials, the penetration of water vapor or corrosive small molecules into the fiber layer will damage the combination of the fiber and the resin, thereby reducing the service life of the pipe material. Therefore, it is necessary to develop a pipe material that has high rigidity while ensuring a smooth inner wall of the pipe material and has certain barrier properties.

[0003] The improvement of the gas barrier property of the PP-R material is mainly affected by the free volume of the polymer and the gas molecular dynamics diameter in terms of the resin base material, and the influence can be explained by the free volume theory. In terms of the filler, the main influencing factors are the amount and morphology of the filler, and the influence can be explained by the equivalent path theory. Nano-layered inorganic materials such as montmorillonite and graphite are used to prepare polymer / layered silicate nanocomposites by intercalation composite technology, which can improve the gas barrier property of the polymer.

[0004] Polymer melt intercalation is a method of preparing nanocomposites by mixing or shearing at a temperature above the melting point or glass transition temperature of the polymer, so that the polymer molecules diffuse and intercalate into the interlayer of the inorganic material. The melt intercalation method for preparing polymer / montmorillonite nanocomposites uses a double-roll mixer, a single-screw extruder, a twin-screw extruder or an injection molding machine as a mixing and processing device, which is more efficient, feasible and has greater industrialization prospects. In the process of preparing polymer / montmorillonite nanocomposites by using conventional processing equipment and melt intercalation method, the key is to select a suitable intercalation agent or to effectively treat the surface of montmorillonite to increase the compatibility between the polymer and montmorillonite, so as to increase the effective dispersion of nano-montmorillonite in the polymer matrix. SUMMARY

[0005] The application aims at the above problems, and provides a preparation method of high-rigidity oxygen-resistant smooth PP-R composite pipe.

[0006] To achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0007] A preparation method of high-rigidity oxygen-resistant smooth PP-R composite pipe, comprising the following steps:

[0008] The preparation steps of the glass fiber / USM / PP-R intercalation composite material are as follows: 100 parts of PP-R resin, 5-20 parts of modified organic montmorillonite, 4-6 parts of a compatibilizer and 1 part of an antioxidant are added into a stirrer for stirring, a USM / PP-R intercalation composite material intermediate is obtained by extrusion through a chaotic mixing double-screw granulator, and the extrusion processing temperature is 200-250 DEG C; then 100 parts of the intermediate and 5-10 parts of a compatibilizer are added into the stirrer for stirring, and the glass fiber / USM / PP-R intercalation composite material is prepared by extrusion through a double-screw extruder, the extrusion processing temperature is 190-220 DEG C, 10-30 parts of chopped glass fiber is added through a side feeding mode in the melting section of the extrusion screw, and the extrusion is cut into particles;

[0009] The preparation steps of the wollastonite fiber / USM / PP-R intercalation composite material are as follows: 100 parts of PP-R resin, 40-50 parts of modified organic montmorillonite, 10-20 parts of a compatibilizer and 1 part of an antioxidant are added into a stirrer for stirring, a USM / PP-R intercalation composite material intermediate is obtained by extrusion through a chaotic mixing double-screw granulator, and the extrusion processing temperature is 220-250 DEG C; then 100 parts of the intermediate and 5-10 parts of a compatibilizer are added into the stirrer for stirring, and the wollastonite fiber / USM / PP-R intercalation composite material is prepared by extrusion through a double-screw extruder, the extrusion processing temperature is 190-220 DEG C, 15-25 parts of wollastonite fiber is added through a side feeding mode in the melting section of the extrusion screw, and the extrusion is cut into particles;

[0010] The preparation steps of the PP-R composite material are as follows: the PP-R resin is mixed and stirred with a color master to obtain the PP-R composite material.

[0011] The pipe material preparation steps are as follows: the glass fiber / USM / PP-R intercalation composite material is used as the preparation material of the glass fiber interlayer, the wollastonite fiber / USM / PP-R intercalation composite material is used as the preparation material of the wollastonite fiber interlayer, and the PP-R composite material is used as the preparation material of the first PPR layer, the second PPR layer and the third PPR layer, and the pipe material is prepared by co-extrusion through five single-screw extruders.

[0012] In the preparation method of the high-rigidity oxygen-resistant smooth PP-R composite pipe, the modified organic montmorillonite is prepared by the following method: montmorillonite is reacted with an intercalation modifier at 100 DEG C in toluene for 2 hours, then the temperature is lowered to 60 DEG C, butyl acrylate is added, and the mixture is treated by microwave for 2-3 hours, then the mixture is filtered, dried, and ground to obtain the modified organic montmorillonite, namely USM.

[0013] In the preparation method of the high-rigidity oxygen-resistant smooth PP-R composite pipe, the intercalation modifier is sodium dodecyl sulfate.

[0014] In the preparation method of the high-rigidity oxygen-resistant smooth PP-R composite pipe, the compatilizer is PP grafted maleic anhydride.

[0015] In the preparation method of the high-rigidity oxygen-resistant smooth PP-R composite pipe, in the pipe preparation step, sufficient heat is provided by double screw shearing based on chaotic mixing design, so that the organic montmorillonite after pre-intercalation modification of butyl acrylate realizes intercalation compounding with PP-R with the help of the compatilizer.

[0016] In the preparation method of the high-rigidity oxygen-resistant smooth PP-R composite pipe, the fiber retention length of the glass fiber is 400-1000 microns.

[0017] In the preparation method of the high-rigidity oxygen-resistant smooth PP-R composite pipe, the median particle size of the wollastonite is 25-30 microns.

[0018] In the preparation method of the high-rigidity oxygen-resistant smooth PP-R composite pipe, the aspect ratio of the wollastonite is 3:1-5:1.

[0019] In the preparation method of the high-rigidity oxygen-resistant smooth PP-R composite pipe, the thickness ratio of the first PPR layer, the wollastonite fiber intercalation layer, the second PPR layer, the glass fiber intercalation layer, and the third PPR layer is 1:0.5:1:1.5:2.

[0020] In the preparation method of the high-rigidity oxygen-resistant smooth PP-R composite pipe, in the PP-R composite material preparation step, the mass ratio of the PP-R resin to the color masterbatch is 100:2.

[0021] Compared with the prior art, the present application has the following advantages:

[0022] 1. By arranging the wollastonite fiber / USM / PP-R intercalation composite material layer in the fiber composite PP-R pipe, the problem of insufficient smoothness of the inner surface of the pipe caused by the glass fiber layer is offset, and the rigidity of the pipe is ensured while the low water resistance of the PP-R inner layer is maintained.

[0023] 2, The intercalation composite of the application brings barrier performance to the pipe material, which not only prevents the penetration of external oxygen into the pipe material, reduces the risk of pipe fouling, but also prevents the penetration of water vapor or corrosive gas in the pipe into the glass fiber reinforced layer, prolonging the effective service life of the pipe material.

[0024] 3, Compared with the pipe material using EVOH in the prior art, the application does not need a bonding layer, which will not reduce the strength of the pipe material or increase the additional wall thickness.

[0025] 4, Compared with the aluminum-plastic and steel-plastic composite pipe with similar functions in the prior art, the pipe material belongs to a co-extruded plastic pipe, which can be connected with plastic pipe fittings and does not have the risk of water leakage and layering, and has lower cost. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic diagram of the application;

[0027] In the figure: the first PPR layer 1, the wollastonite fiber interlayer 2, the second PPR layer 3, the glass fiber interlayer 4, and the third PPR layer 5. DETAILED DESCRIPTION

[0028] The application will be further described in detail below in combination with the drawings and specific embodiments of the specification.

[0029] The raw materials used in the following examples and comparative examples are as follows:

[0030] Butyl acrylate, industrial grade, Jinan Mingwei Chemical Co., Ltd.;

[0031] Organic montmorillonite, nanoscale, Zhejiang Fenghong New Material Co., Ltd.;

[0032] Toluene, analytical pure;

[0033] PP-R resin, PA14D-2, Daqing Petrochemical Company;

[0034] Compatibilizer, PP grafted maleic anhydride, Ningbo Nengzhiguang New Material Technology Co., Ltd.;

[0035] Antioxidant, 1010 and 168 compound;

[0036] Glass fiber, 508C, China Jushi Co., Ltd.;

[0037] Wollastonite fiber, WP100, Hubei Fengjiashan Silicon Fiber Co., Ltd.

[0038] Example 1

[0039] This embodiment provides a preparation method of a high-rigidity oxygen-resistant smooth PP-R composite pipe, as shown in Figure 1 The pipe is prepared by the following steps:

[0040] The preparation steps of the glass fiber / USM / PP-R intercalation composite material are as follows: 100 parts of PP-R resin, 5 parts of modified organic montmorillonite, 4 parts of PP grafted maleic anhydride and 1 part of antioxidant are added into a stirrer for stirring, a USM / PP-R intercalation composite material intermediate is obtained by extrusion through a chaotic mixing double screw granulator, and the extrusion processing temperature is 200℃; then 100 parts of the intermediate, 5 parts of PP grafted maleic anhydride are added into a stirrer for stirring, and the extrusion is carried out by using a double screw extruder, the extrusion processing temperature is 190℃, 10 parts of chopped glass fiber is added through side feeding in the melting section of the extrusion screw, and the glass fiber / USM / PP-R intercalation composite material is prepared by extrusion and granulation.

[0041] The preparation steps of the wollastonite fiber / USM / PP-R intercalation composite material are as follows: 100 parts of PP-R resin, 40 parts of modified organic montmorillonite, 10 parts of PP grafted maleic anhydride and 1 part of antioxidant are added into a stirrer for stirring, a USM / PP-R intercalation composite material intermediate is obtained by extrusion through a chaotic mixing double screw granulator, and the extrusion processing temperature is 220℃; then 100 parts of the intermediate, 5 parts of PP grafted maleic anhydride are added into a stirrer for stirring, and the extrusion is carried out by using a double screw extruder, the extrusion processing temperature is 190℃, 15 parts of wollastonite fiber is added through side feeding in the melting section of the extrusion screw, and the wollastonite fiber / USM / PP-R intercalation composite material is prepared by extrusion and granulation.

[0042] The preparation steps of the PP-R composite material are as follows: the PP-R resin and the color master batch are mixed and stirred in a mass ratio of 100:2 to obtain the PP-R composite material.

[0043] The pipe preparation steps are as follows: the glass fiber / USM / PP-R intercalation composite material is used as the preparation material of the glass fiber interlayer 4, the wollastonite fiber / USM / PP-R intercalation composite material is used as the preparation material of the wollastonite fiber interlayer 2, and the PP-R composite material is used as the preparation material of the first PPR layer 1, the second PPR layer 3 and the third PPR layer 5, and the pipe is prepared by co-extrusion through five single screw extruders.

[0044] The modified organic montmorillonite is prepared by the following method: the montmorillonite and sodium dodecyl sulfate are reacted at 100℃ in toluene for 2h, then the temperature is lowered to 60℃, butyl acrylate is added, and the mixture is treated by microwave for 2h, then the mixture is filtered, dried and ground to obtain the modified organic montmorillonite.

[0045] Example 2

[0046] The present embodiment provides a preparation method of a high-rigidity oxygen-resistant smooth PP-R composite pipe, as shown in Figure 1 The preparation method is as follows:

[0047] The preparation steps of the glass fiber / USM / PP-R intercalation composite material are as follows: 100 parts of PP-R resin, 20 parts of modified organic montmorillonite, 6 parts of PP grafted maleic anhydride and 1 part of antioxidant are added into a stirrer for stirring, a USM / PP-R intercalation composite material intermediate is obtained by using a chaotic mixing double-screw granulator for extrusion, and the extrusion processing temperature is 250 DEG C; then 100 parts of the intermediate, 10 parts of PP grafted maleic anhydride are added into a stirrer for stirring, and the USM / PP-R intercalation composite material is prepared by using a double-screw extruder for extrusion, the extrusion processing temperature is 220 DEG C, 30 parts of chopped glass fiber is added through side feeding in the melting section of the extrusion screw, and the extrusion is cut into particles.

[0048] The preparation steps of the wollastonite fiber / USM / PP-R intercalation composite material are as follows: 100 parts of PP-R resin, 50 parts of modified organic montmorillonite, 20 parts of PP grafted maleic anhydride and 1 part of antioxidant are added into a stirrer for stirring, a USM / PP-R intercalation composite material intermediate is obtained by using a chaotic mixing double-screw granulator for extrusion, and the extrusion processing temperature is 250 DEG C; then 100 parts of the intermediate, 5-10 parts of PP grafted maleic anhydride are added into a stirrer for stirring, and the USM / PP-R intercalation composite material is prepared by using a double-screw extruder for extrusion, the extrusion processing temperature is 220 DEG C, 25 parts of wollastonite fiber is added through side feeding in the melting section of the extrusion screw, and the extrusion is cut into particles.

[0049] The preparation steps of the PP-R composite material are as follows: PP-R resin and color masterbatch are mixed and stirred in a mass ratio of 100:2 to obtain a PP-R composite material.

[0050] The pipe preparation steps are as follows: the glass fiber / USM / PP-R intercalation composite material is used as the preparation material of the glass fiber interlayer 4, the wollastonite fiber / USM / PP-R intercalation composite material is used as the preparation material of the wollastonite fiber interlayer 2, and the PP-R composite material is used as the preparation material of the first PPR layer 1, the second PPR layer 3 and the third PPR layer 5, and the pipe is prepared by co-extrusion of five single-screw extruders.

[0051] The modified organic montmorillonite is prepared by the following method: after the montmorillonite and sodium dodecyl sulfate are reacted at 100 DEG C in toluene for 2 h, the temperature is lowered to 60 DEG C, butyl acrylate is added, and the mixture is treated by microwave for 3 h, and then filtered, dried and ground to obtain the modified organic montmorillonite.

[0052] Example 3

[0053] The present embodiment provides a preparation method of a high-rigidity oxygen-resistant smooth PP-R composite pipe, as shown in Figure 1 The preparation method is as follows:

[0054] The preparation steps of the glass fiber / USM / PP-R intercalation composite material are as follows: 100 parts of PP-R resin, 10 parts of modified organic montmorillonite, 5 parts of PP grafted maleic anhydride and 1 part of antioxidant are added into a stirrer for stirring, a USM / PP-R intercalation composite material intermediate is obtained by using a chaotic mixing double screw granulator for extrusion, and the extrusion processing temperature is 220℃; then 100 parts of the intermediate, 8 parts of PP grafted maleic anhydride are added into a stirrer for stirring, and the extrusion processing temperature is 205℃; 20 parts of chopped glass fiber is added into the melt section of the extrusion screw by side feeding, and the glass fiber / USM / PP-R intercalation composite material is prepared by extrusion and granulation.

[0055] The preparation steps of the wollastonite fiber / USM / PP-R intercalation composite material are as follows: 100 parts of PP-R resin, 45 parts of modified organic montmorillonite, 15 parts of PP grafted maleic anhydride and 1 part of antioxidant are added into a stirrer for stirring, a USM / PP-R intercalation composite material intermediate is obtained by using a chaotic mixing double screw granulator for extrusion, and the extrusion processing temperature is 235℃; then 100 parts of the intermediate, 8 parts of PP grafted maleic anhydride are added into a stirrer for stirring, and the extrusion processing temperature is 205℃; 20 parts of wollastonite fiber is added into the melt section of the extrusion screw by side feeding, and the wollastonite fiber / USM / PP-R intercalation composite material is prepared by extrusion and granulation.

[0056] The preparation steps of the PP-R composite material are as follows: PP-R resin and color masterbatch are mixed and stirred in a mass ratio of 100:2 to obtain a PP-R composite material.

[0057] The pipe preparation steps are as follows: the glass fiber / USM / PP-R intercalation composite material is used as the preparation material of the glass fiber interlayer 4, the wollastonite fiber / USM / PP-R intercalation composite material is used as the preparation material of the wollastonite fiber interlayer 2, and the PP-R composite material is used as the preparation material of the first PPR layer 1, the second PPR layer 3 and the third PPR layer 5, and a pipe is prepared by co-extrusion of five single screw extruders.

[0058] The modified organic montmorillonite is prepared by the following method: montmorillonite and sodium dodecyl sulfate are reacted at 100℃ in toluene for 2h, then the temperature is lowered to 60℃, butyl acrylate is added, and the mixture is treated with a microwave for 2h, then the mixture is filtered, dried and ground to obtain the modified organic montmorillonite.

[0059] Comparative Example 1

[0060] This comparative example provides a preparation method of a PP-R composite pipe, which is prepared by the following steps:

[0061] The preparation steps of the glass fiber / montmorillonite / PP-R intercalation composite material are as follows: 100 parts of PP-R resin, 10 parts of montmorillonite, 5 parts of PP grafted maleic anhydride and 1 part of antioxidant are added to a stirrer for stirring, a chaotic mixing double screw granulator is used for extrusion to obtain a montmorillonite / PP-R intercalation composite material intermediate, and the extrusion processing temperature is 220℃; then 100 parts of the intermediate, 8 parts of PP grafted maleic anhydride are added to a stirrer for stirring, and a double screw extruder is used for extrusion, the extrusion processing temperature is 205℃, 20 parts of chopped glass fiber is added through side feeding in the melting section of the extrusion screw, and the glass fiber / montmorillonite / PP-R intercalation composite material is prepared by extrusion and granulation.

[0062] The preparation steps of the wollastonite fiber / montmorillonite / PP-R intercalation composite material are as follows: 100 parts of PP-R resin, 45 parts of montmorillonite, 15 parts of PP grafted maleic anhydride and 1 part of antioxidant are added to a stirrer for stirring, a chaotic mixing double screw granulator is used for extrusion to obtain a montmorillonite / PP-R intercalation composite material intermediate, and the extrusion processing temperature is 235℃; then 100 parts of the intermediate, 8 parts of PP grafted maleic anhydride are added to a stirrer for stirring, and a double screw extruder is used for extrusion, the extrusion processing temperature is 205℃, 20 parts of wollastonite fiber is added through side feeding in the melting section of the extrusion screw, and the wollastonite fiber / montmorillonite / PP-R intercalation composite material is prepared by extrusion and granulation.

[0063] The preparation steps of the PP-R composite material are as follows: PP-R resin and color masterbatch are mixed and stirred in a mass ratio of 100:2 to obtain a PP-R composite material.

[0064] The pipe preparation steps are as follows: the glass fiber / montmorillonite / PP-R intercalation composite material is used as the preparation material of glass fiber interlayer 4, the wollastonite fiber / montmorillonite / PP-R intercalation composite material is used as the preparation material of wollastonite fiber interlayer 2, and the PP-R composite material is used as the preparation material of the first PPR layer 1, the second PPR layer 3 and the third PPR layer 5, and a pipe is prepared by co-extrusion of five single screw extruders.

[0065] Comparative Example 2

[0066] The present comparative example provides a preparation method of a PP-R composite pipe, which is prepared by the following steps:

[0067] (1) 100 parts of PPR resin are used as raw material, 25 parts of short glass fiber, 5 parts of compatibilizer and 1 part of antioxidant are added, a stirrer is used for stirring, and a double screw granulator is used for granulation to prepare a glass fiber / PP-R composite material.

[0068] (2) The glass fiber / PP-R composite material prepared in step (1) is used as the intermediate layer material, and PP-R and color masterbatch are stirred at a ratio of 100:2 to be used as the inner and outer layer materials, and a three-layer composite pipe is prepared by co-extrusion through three single-screw extruders. The inner, middle and outer layers of the pipe are in a ratio of 1:1:1.

[0069] Comparative Example 3

[0070] The present comparative example provides a preparation method of a PP-R composite pipe, which is prepared by the following steps:

[0071] (1) 100 parts of PPR resin are used as raw material, 25 parts of short glass fiber, 5 parts of compatibilizer and 1 part of antioxidant are added, and a glass fiber / PP-R composite material is prepared by stirring with a stirrer and granulating through a double-screw granulator.

[0072] (2) The glass fiber / PP-R composite material prepared in step (1) is used as the second and fourth layer materials, and PP-R and color masterbatch are stirred at a ratio of 100:2 to be used as the first, third and fifth layer materials, and a five-layer composite pipe is prepared by co-extrusion through five single-screw extruders. The first to fifth layers of the pipe are in a ratio of 1:1:1:1:2.

[0073] Application Example 1

[0074] The pipes prepared in Examples 2-3 and Application Example 1-3 are subjected to relevant performance tests, and the results are shown in the following table:

[0075]

[0076]

[0077] Result analysis: From the above experimental results, it can be seen that the pipes of Examples 2-3 and Comparative Examples 1-3 all meet the performance requirements of “7.4 Physical and mechanical properties” in “QB / T5402-2019 Cold and hot water fiber composite polypropylene pipe” except ash content. On this basis, the inner surface of Example 2-3 is smooth, and the hot water hydrostatic pressure and oxygen barrier performance are obviously improved.

[0078] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.

[0079] Although the terms first PPR layer 1, wollastonite fiber interlayer 2, second PPR layer 3, glass fiber interlayer 4, third PPR layer 5, etc. are used more frequently herein, the possibility of using other terms is not excluded. The use of these terms is merely for the sake of convenience in describing and explaining the nature of the application; they are not to be construed as any kind of additional limitation on the application.

Claims

1. A method for preparing a high-rigidity oxygen-barrier smooth PP-R composite pipe, characterized by, The method comprises the following steps: The preparation steps of the glass fiber / USM / PP-R intercalation composite material are as follows: 100 parts of PP-R resin, 5-20 parts of modified organic montmorillonite, 4-6 parts of a compatibilizer and 1 part of an antioxidant are stirred in a stirring machine, and an USM / PP-R intercalation composite material intermediate is obtained by extrusion through a chaotic mixing double-screw granulator, with an extrusion processing temperature of 200-250 DEG C; then 100 parts of the intermediate and 5-10 parts of a compatibilizer are stirred in a stirring machine, and the glass fiber / USM / PP-R intercalation composite material is prepared by extrusion through a double-screw extruder, with an extrusion processing temperature of 190-220 DEG C, 10-30 parts of chopped glass fiber being added through side feeding in the melting section of the extrusion screw, and the material being extruded and cut into particles; The preparation steps of the glass fiber / USM / PP-R intercalation composite material are as follows: 100 parts of PP-R resin, 5-20 parts of modified organic montmorillonite, 4-6 parts of a compatibilizer and 1 part of an antioxidant are stirred in a stirring machine, and an USM / PP-R intercalation composite material intermediate is obtained by extrusion through a chaotic mixing double-screw granulator, with an extrusion processing temperature of 200-250 DEG C; then 100 parts of the intermediate and 5-10 parts of a compatibilizer are stirred in a stirring machine, and the glass fiber / USM / PP-R intercalation composite material is prepared by extrusion through a double-screw extruder, with an extrusion processing temperature of 190-220 DEG C, 10-30 parts of chopped glass fiber being added through side feeding in the melting section of the extrusion screw, and the material being extruded and cut into particles; The preparation steps of the PP-R composite material are as follows: PP-R resin and color masterbatch are stirred to obtain a PP-R composite material; The pipe preparation steps are as follows: the glass fiber / USM / PP-R intercalation composite material is used as the preparation material of the glass fiber interlayer (4), the wollastonite fiber / USM / PP-R intercalation composite material is used as the preparation material of the wollastonite fiber interlayer (2), and the PP-R composite material is used as the preparation material of the first PPR layer (1), the second PPR layer (3) and the third PPR layer (5), and a pipe is prepared by co-extrusion through five single-screw extruders.

2. The preparation method of the high-rigidity oxygen-barrier smooth PP-R composite pipe according to claim 1, characterized in that: The modified organic montmorillonite is prepared by the following method: montmorillonite and an intercalation modifier are reacted in 100 DEG C toluene for 2 hours, then the temperature is lowered to 60 DEG C, butyl acrylate is added, and the mixture is treated by microwave for 2-3 hours, and then the mixture is filtered, dried and ground to obtain the modified organic montmorillonite.

3. The method for preparing a high-rigidity oxygen-barrier smooth PP-R composite pipe according to claim 2, characterized in that: The intercalation modifier is sodium dodecyl sulfate.

4. The method for preparing a high-rigidity oxygen-barrier smooth PP-R composite pipe according to claim 1, characterized in that: The compatibilizer is PP grafted maleic anhydride.

5. The method for preparing a high-rigidity oxygen-barrier smooth PP-R composite pipe according to claim 1, characterized in that: In the pipe preparation steps, sufficient heat is provided by the double-screw shearing based on chaotic mixing design, so that the modified organic montmorillonite after the pre-intercalation modification of butyl acrylate realizes intercalation with the PP-R with the help of the compatibilizer.

6. The method for preparing a high-rigidity oxygen-barrier smooth PP-R composite pipe according to claim 1, characterized in that: The fiber retention length of the glass fiber is 400-1000 microns.

7. The method for preparing a high-rigidity oxygen-barrier smooth PP-R composite pipe as described in claim 1, characterized in that: The median particle size of the wollastonite is 25-30 microns.

8. The method for preparing a high-rigidity oxygen-barrier smooth PP-R composite pipe as described in claim 1, characterized in that: The aspect ratio of the wollastonite is 3:1-5:

1.

9. The method for preparing a high-rigidity oxygen-barrier smooth PP-R composite pipe as described in claim 1, characterized in that: The thickness ratio of the first PPR layer (1), the wollastonite fiber interlayer (2), the second PPR layer (3), the glass fiber interlayer (4) and the third PPR layer (5) is 1:0.5:1:1.5:

2.

10. The method for preparing a high-rigidity oxygen-barrier smooth PP-R composite pipe as described in claim 1, characterized in that: In the preparation step of the PP-R composite material, the mass ratio of the PP-R resin and the color master batch is 100:2.

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