MPPE modified polypropylene polyethylene composite reinforced double-wall reinforced corrugated pipe and preparation method thereof

Abstract

On the one hand, the present invention provides an MPPE modified polypropylene polyethylene composite reinforced double-wall reinforced corrugated pipe, comprising a pipe substrate, the outer side wall of the pipe substrate is equidistantly provided with a plurality of outer wave layers along the circumferential direction, the outer wave layers are hollow structures, the tops of the outer wave layers are provided with first M-shaped reinforcing ribs, a plurality of second reinforcing ribs are provided between the outer wave layers along the circumferential direction of the pipe substrate, and a plurality of third reinforcing ribs are provided in an array along the axial direction of the outer side wall of the pipe substrate; on the other hand, a preparation method of the corrugated pipe is provided, comprising the following steps: S1, mixing high-density polyethylene particles and polypropylene particles and stirring them evenly, and melt-extruding, S2, drying and grinding the result of step S1 into powder, mixing them evenly with inorganic material powder, and melt-extruding, S3, drying and grinding the result of step S2 into powder, and melt-extruding according to the shape of a mold; the corrugated pipe of the present invention has excellent rigidity and anti-extrusion ability.

Description

Technical Field

[0001] The invention relates to the technical field of municipal water supply and drainage pipelines, and in particular to an MPPE modified polypropylene polyethylene composite reinforced double-wall reinforced corrugated pipe and a preparation method thereof. Background Art

[0002] At present, corrugated pipes are made of polyethylene or polypropylene as raw materials, and are made of structural wall pipes by one-piece extrusion process. They are widely used in municipal drainage, farmland water supply and industrial sewage discharge, etc., and can replace traditional concrete pipes and cast iron pipes. However, polyethylene or polypropylene materials themselves have poor performance in terms of material strength and toughness, and are prone to deformation. The existing technology usually only focuses on the structure of the pipeline, and there is no research on the pipe body material. Summary of the invention

[0003] Based on this, in order to solve the above problems, it is necessary to propose an MPPE modified polypropylene polyethylene composite reinforced double-wall reinforced corrugated pipe and a preparation method.

[0004] On the one hand, the present invention provides an MPPE modified polypropylene polyethylene composite reinforced double-wall reinforced corrugated pipe, including a pipe base, the outer side wall of the pipe base is equidistantly provided with a plurality of outer wave layers along the circumferential direction, the outer wave layer is a hollow structure, the top of the outer wave layer is provided with an M-shaped first reinforcing rib, a plurality of second reinforcing ribs are provided between the outer wave layers along the circumferential direction of the pipe base, and a plurality of third reinforcing ribs are arranged in an array along the axial direction of the outer side wall of the pipe base.

[0005] Preferably, one end of the pipe substrate is provided with a socket flare.

[0006] Preferably, the outer side wall of the socket flare is provided with a plurality of outer wave layers at equal intervals along the circumferential direction.

[0007] Preferably, a first M-shaped reinforcing rib is provided on the top of the outer wave layer.

[0008] Preferably, the height of the second reinforcing rib is less than or equal to the height of the third reinforcing rib.

[0009] Preferably, a plurality of tube pillows are provided at the crests or troughs of the outer wave layer, and the distance between adjacent tube pillows is 2-3 meters.

[0010] Preferably, a plurality of supporting plates are provided at the wave crests or wave troughs of the outer wave layer, the distance between adjacent supporting plates is 2-3 meters, and the supporting plates are integrally formed with the outer wave layer.

[0011] Another aspect of the present invention provides an MPPE modified polypropylene polyethylene composite reinforced double-wall reinforced corrugated pipe, comprising the following steps:

[0012] S1, mixing high-density polyethylene particles and polypropylene particles evenly, and melt-extruding;

[0013] S2, drying and grinding the product obtained in step S1 into powder, mixing the powder with inorganic material powder, and melt-extruding the mixture;

[0014] S3, drying and grinding the product obtained in step S2 into powder, and melt-extruding the powder according to the shape of a mold.

[0015] Preferably, in step S1:

[0016] The weight ratio of high-density polyethylene particles to polypropylene particles is 1:(18-20), the particle size of the high-density polyethylene particles is 1-2 mm, the mixing time is 5-15 minutes, the mixing speed is 500-1000 rpm, and the melting temperature is 240-280°C.

[0017] Preferably, in step S2:

[0018] The inorganic material powder is a composition of light calcium carbonate powder and heavy calcium carbonate powder, the weight ratio of the light calcium carbonate powder to the heavy calcium carbonate powder is 1:(5-8), the particle size of the light calcium carbonate powder is 0.1-1 micron, the particle size of the heavy calcium carbonate powder is 3-5 microns, the weight ratio of the inorganic material powder to the result of step S1 is 1:(50-80), the mixing time is 5-15 minutes, the mixing rate is 500-1000 rpm, and the melting temperature is 240-280°C.

[0019] Preferably, in step S3, the melting temperature is 240-280°C.

[0020] The beneficial effects of the present invention are:

[0021] (1) The present invention improves the strength of the pipe body from two aspects: the pipe body structure and the pipe body material;

[0022] (2) In terms of structure, the outer corrugated layer and the second reinforcing ribs are staggered along the circumferential direction of the tube base, which enhances the overall rigidity and anti-extrusion ability of the corrugated tube;

[0023] (3) The third reinforcing rib is arranged along the axial direction of the tube substrate, which improves the longitudinal stiffness of the corrugated tube, and the third reinforcing rib and the second reinforcing rib are in a cross shape, which further ensures the stiffness of the corrugated tube in both the circumferential and axial directions;

[0024] (4) The first M-shaped reinforcing rib arranged on the top of the outer corrugated layer is integrally formed and melt-extruded with the outer corrugated layer. The M-shaped structure further ensures the wear resistance of the outer wall of the corrugated tube;

[0025] (5) Multiple pipe pillows are set on the outer wall of the pipe base to ensure that the corrugated pipe does not roll around when placed on the ground;

[0026] (6) In terms of materials, high-density polyethylene is blended with polypropylene to improve the strength of plastic materials;

[0027] (7) Adding inorganic materials into high-density polyethylene / polypropylene blends further increases the impact resistance and bending resistance of the materials;

[0028] (8) After heavy calcium carbonate powder and light calcium carbonate powder are compounded, the rigid small particles cooperate with each other, further improving the strength of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of the MPPE modified polypropylene polyethylene composite reinforced double-wall reinforced corrugated pipe described in Example 1 of the present invention. Figure 1 ;

[0030] Figure 2 This is a schematic diagram of the structure of the MPPE modified polypropylene polyethylene composite reinforced double-wall reinforced corrugated pipe described in Example 1 of the present invention. Figure 2 ;

[0031] Figure 3 This is a schematic diagram of the structure of the MPPE modified polypropylene polyethylene composite reinforced double-wall reinforced corrugated pipe described in Example 1 of the present invention. Figure 3 ;

[0032] Figure 4 This is a schematic diagram of the structure of the MPPE modified polypropylene polyethylene composite reinforced double-wall reinforced corrugated pipe described in Example 1 of the present invention. Figure 4 ;

[0033] Figure 5 This is a schematic diagram of the structure of the MPPE modified polypropylene polyethylene composite reinforced double-wall reinforced corrugated pipe described in Example 1 of the present invention. Figure 5 ;

[0034] Figure 6 This is a schematic diagram of the structure of the MPPE modified polypropylene polyethylene composite reinforced double-wall reinforced corrugated pipe described in Example 1 of the present invention. Figure 6 ;

[0035] Figure 7 This is a schematic diagram of the structure of the MPPE modified polypropylene polyethylene composite reinforced double-wall reinforced corrugated pipe described in Example 1 of the present invention. Figure 7 ;

[0036] Figure 8 This is a schematic diagram of the structure of the MPPE modified polypropylene polyethylene composite reinforced double-wall reinforced corrugated pipe described in Example 1 of the present invention. Figure 8 ;

[0037] Fig. 9 This is a schematic diagram of the structure of the MPPE modified polypropylene polyethylene composite reinforced double-wall reinforced corrugated pipe described in Example 1 of the present invention. Figure 9 ;

[0038] Fig.10 This is a schematic diagram of the structure of the MPPE modified polypropylene polyethylene composite reinforced double-wall reinforced corrugated pipe described in Example 1 of the present invention. Figure 10 .

[0039] In the figure: 1. pipe base; 11. outer wave layer; 12. first reinforcing rib; 13. second reinforcing rib; 14. third reinforcing rib; 2. socket flare; 3. pipe pillow; 4. supporting plate. DETAILED DESCRIPTION

[0040] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0041] Embodiment 1:

[0042] like Figure 1 As shown, on one hand, the present invention provides an MPPE modified polypropylene polyethylene composite reinforced double-wall reinforced corrugated pipe, including a pipe base 1, the outer wall of the pipe base 1 is equidistantly provided with a plurality of outer wave layers 11 along the circumferential direction, the outer wave layer 11 is a hollow structure, the top of the outer wave layer 11 is provided with an M-shaped first reinforcing rib 12, a plurality of second reinforcing ribs 13 are provided between the outer wave layers 11 along the circumferential direction of the pipe base 1, and a plurality of third reinforcing ribs 14 are arranged in an array along the axial direction of the outer wall of the pipe base 1.

[0043] In this embodiment, the outer wave layer and the second reinforcement ribs are staggered along the circumferential direction of the tube substrate, which enhance the overall stiffness and extrusion resistance of the corrugated tube. The third reinforcement rib is arranged along the axial direction of the tube substrate, which improves the longitudinal stiffness of the corrugated tube. The third reinforcement rib and the second reinforcement rib are in a cross shape, which further ensures the stiffness of the corrugated tube in both the circumferential and axial directions. The M-shaped first reinforcement rib arranged on the top of the outer wave layer is integrally formed by melt extrusion with the outer wave layer. The M-shaped structure further ensures the wear resistance of the outer wall of the corrugated tube.

[0044] Example 2

[0045] As an improvement of Example 1, Figure 2 As shown, the remaining features are the same as those of Example 1, except that a socket flare 2 is provided at one end of the tube substrate 1. When the bellows is connected, the sealing of the bellows connection is ensured by hot-melting the socket.

[0046] Example 3

[0047] As an improvement of Example 1, Figure 3As shown, the remaining features are the same as those of Example 1, except that the outer side wall of the socket flare 2 is provided with a plurality of outer wave layers 11 equidistantly along the circumferential direction, which further enhances the rigidity of the bellows connection.

[0048] Example 4

[0049] As an improvement of Example 1, Figure 4 As shown, the remaining features are the same as those of Example 1, except that a first M-shaped reinforcing rib 12 is provided on the top of the outer wave layer 11 .

[0050] Example 5

[0051] As an improvement of Example 1, Figure 5 As shown, the remaining features are the same as those of Embodiment 1, except that the height of the second reinforcing rib 13 is equal to the height of the third reinforcing rib 14 .

[0052] Example 6

[0053] As an improvement of Example 1, Figure 6 As shown, the remaining features are the same as those of Embodiment 1, except that the height of the second reinforcing rib 13 is less than the height of the third reinforcing rib 14 .

[0054] Example 7

[0055] As an improvement of Example 1, Figure 7 As shown, a plurality of tube pillows are provided at the troughs of the outer wave layer, and the distance between adjacent tube pillows is 2-3 meters.

[0056] Example 8

[0057] As an improvement of Example 1, Figure 8 As shown, a plurality of tube pillows are provided at the wave crests of the outer wave layer, and the distance between adjacent tube pillows is 2-3 meters.

[0058] Example 9

[0059] As an improvement of Example 1, Fig. 9 As shown, a plurality of supporting plates are provided at the wave crests of the outer wave layer, the distance between adjacent supporting plates is 2-3 meters, and the supporting plates are integrally formed with the outer wave layer.

[0060] Example 10

[0061] As an improvement of Example 1, Fig.10 As shown, a plurality of supporting plates are provided at the troughs of the outer wave layer, the distance between adjacent supporting plates is 2-3 meters, and the supporting plates are integrally formed with the outer wave layer.

[0062] Preparation Example 1

[0063] Another aspect of the present invention provides an MPPE modified polypropylene polyethylene composite reinforced double-wall reinforced corrugated pipe, comprising the following steps:

[0064] S1, mixing high-density polyethylene particles and polypropylene particles evenly, and melt-extruding;

[0065] Specifically, 50 g of high-density polyethylene particles with a particle size of 1 mm and 950 g of polypropylene particles were placed in a high-speed mixer and stirred at a rotation speed of 800 rpm for 10 minutes, and then the uniformly stirred mixture was transferred to a twin-screw plastic extruder and melt-extruded at 260°C.

[0066] S2, drying and grinding the product obtained in step S1 into powder, mixing the powder with inorganic material powder, and melt-extruding the mixture;

[0067] Specifically, the resultant in step S1 is moved into an oven and heated at 40°C for 4 hours, then ground into powder with a mortar for later use, 2 grams of light calcium carbonate powder with a particle size of 0.89 microns and 14 grams of heavy calcium carbonate powder with a particle size of 4 microns are fully mixed and added to the powder obtained in step S1, the resulting mixture is added to a high-speed mixer and stirred at a speed of 800 rpm for 10 minutes, and then the evenly stirred mixture is transferred to a twin-screw plastic extruder and melt-extruded at 260°C.

[0068] S3, drying and grinding the product obtained in step S2 into powder, and melt-extruding the powder according to the shape of a mold.

[0069] Specifically, the product obtained in step S2 is moved into an oven and heated at 40°C for 4 hours, then ground into powder with a mortar and poured into a twin-screw plastic extruder, a mold is installed at the head of the twin-screw plastic extruder, and extruded at a melt temperature of 260°C.

[0070] The properties of the obtained material A1 are shown in Table 1.

[0071] Preparation Example 2

[0072] The remaining characteristics are the same as those of Preparation Example 1, except that the amount of high-density polyethylene particles added is 53 grams, and the amount of light calcium carbonate powder added is 2.8 grams.

[0073] The properties of the obtained material A2 are shown in Table 1.

[0074] Preparation Example 3

[0075] The remaining characteristics are the same as those of Preparation Example 1, except that the amount of high-density polyethylene particles added is 47.5 grams, and the amount of light calcium carbonate powder added is 1.75 grams.

[0076] The properties of the obtained material A3 are shown in Table 1.

[0077] Preparation Example 4

[0078] The remaining characteristics are the same as those of Preparation Example 1, except that the particle size of the high-density polyethylene particles is 2 mm, the particle size of the light calcium carbonate powder is 0.1 μm, and the particle size of the heavy calcium carbonate powder is 3 μm.

[0079] The properties of the obtained material A4 are shown in Table 1.

[0080] Preparation Example 5

[0081] The remaining characteristics are the same as those of Preparation Example 1, except that the particle size of the high-density polyethylene particles is 2 mm, the particle size of the light calcium carbonate powder is 1 μm, and the particle size of the heavy calcium carbonate powder is 5 μm.

[0082] The properties of the obtained material A5 are shown in Table 1.

[0083] Preparation of Control Example 1

[0084] The remaining characteristics are the same as those of Preparation Example 1, except that no heavy calcium carbonate powder and light calcium carbonate powder are added.

[0085] The properties of the obtained material D1 are shown in Table 1.

[0086] Preparation of Control Example 2

[0087] The remaining characteristics are the same as those of Preparation Example 1, except that the amount of high-density polyethylene particles added is 80 grams, and the amount of light calcium carbonate powder added is 10 grams.

[0088] The properties of the obtained material D2 are shown in Table 1.

[0089] Preparation of Control Example 3

[0090] The remaining characteristics are the same as those of Preparation Example 1, except that the amount of high-density polyethylene particles added is 20 grams, and the amount of light calcium carbonate powder added is 1 gram.

[0091] The properties of the obtained material D3 are shown in Table 1.

[0092] Preparation of Control Example 4

[0093] The remaining characteristics are the same as those of Preparation Example 1, except that the particle size of the high-density polyethylene particles is 2 mm, the particle size of the light calcium carbonate powder is 0.01 μm, and the particle size of the heavy calcium carbonate powder is 0.05 μm.

[0094] The properties of the obtained material D4 are shown in Table 1.

[0095] Preparation of Control Example 5

[0096] The remaining characteristics are the same as those of Preparation Example 1, except that the particle size of the high-density polyethylene particles is 2 mm, the particle size of the light calcium carbonate powder is 10 μm, and the particle size of the heavy calcium carbonate powder is 20 μm.

[0097] The properties of the obtained material D5 are shown in Table 1.

[0098] Test Case

[0099] The impact strength test is carried out in accordance with the national standard (GB / T 1843-2008) "Determination of the cantilever beam impact strength of plastics" for sample preparation and testing.

[0100] The bending resistance test is carried out in accordance with the national standard (GB / T 9341-2008) "Determination of flexural properties of plastics" for sample preparation and testing.

[0101] All experiments were carried out at room temperature.

[0102] The test results are shown in Table 1.

[0103] Table 1

[0104]

[0105]

[0106] It can be seen from Table 1 that the material A1 prepared in Preparation Example 1 has the best impact strength and bending resistance. It can be seen that when the amount and particle size of each component fall within the range specified by the present invention, the impact strength of the material can reach 13KJ·m -2 As mentioned above, the bending resistance can reach above 50MPa, and as the pipe material of the corrugated pipe, the produced corrugated pipe has good rigidity.

[0107] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A MPPE modified polypropylene polyethylene composite reinforced double-wall reinforced corrugated pipe, comprising a pipe matrix, characterized in that: The outer side wall of the tube substrate is provided with a plurality of outer wave layers equidistantly along the circumferential direction, the outer wave layers are hollow structures, the top of the outer wave layers is provided with a first M-shaped reinforcing rib, a plurality of second reinforcing ribs are provided between the outer wave layers along the circumferential direction of the tube substrate, and the outer side wall of the tube substrate is provided with a plurality of third reinforcing ribs in an array along the axial direction; One end of the pipe base is provided with a socket flare; The outer side wall of the socket-flared opening is provided with a plurality of outer wave layers at equal intervals in the circumferential direction; The top of the outer wave layer is provided with a first M-shaped reinforcement rib; The height of the second reinforcing rib is less than or equal to the height of the third reinforcing rib; A plurality of supporting plates are arranged at the wave crests or wave troughs of the outer wave layer, the distance between adjacent supporting plates is 2-3 meters, and the supporting plates are integrally formed with the outer wave layer.

2. A method for preparing a MPPE modified polypropylene polyethylene composite reinforced double-wall reinforced corrugated pipe, characterized in that: The steps include: S1, mixing high-density polyethylene particles and polypropylene particles evenly, and melt-extruding; S2, drying and grinding the product obtained in step S1 into powder, mixing the powder with inorganic material powder, and melt-extruding the mixture; S3, drying and grinding the product obtained in step S2 into powder, and then melt-extruding the powder according to the shape of a mold; In step S1: The weight ratio of high-density polyethylene particles to polypropylene particles is 1:(18-20), the particle size of the high-density polyethylene particles is 1-2 mm, the mixing time is 5-15 minutes, the mixing speed is 500-1000 rpm, and the melting temperature is 240-280°C; In step S2: The inorganic material powder is a combination of light calcium carbonate powder and heavy calcium carbonate powder, the weight ratio of the light calcium carbonate powder to the heavy calcium carbonate powder is 1:(5-8), the particle size of the light calcium carbonate powder is 0.1-1 micron, the particle size of the heavy calcium carbonate powder is 3-5 microns, the weight ratio of the inorganic material powder to the product obtained in step S1 is 1:(50-80), the mixing time is 5-15 minutes, the mixing speed is 500-1000 rpm, and the melting temperature is 240-280°C; In step S3, the melting temperature is 240-280°C.

Images