Plastic product as well as preparation method and application thereof

Abstract

The invention relates to the field of plastic products, in particular to a plastic product and a preparation method and application thereof. The plastic product comprises N frameworks and M reinforcing ribs perpendicular to the frameworks in the axial direction in the unit length direction, N is larger than or equal to 60, and M is larger than or equal to 12. The framework is annular or polygonal; the distance between the Nth framework and the (N-1) th framework is L1, the distance between the Mth reinforcing rib and the (M-1) th reinforcing rib is L2, L1 is larger than or equal to 1 and smaller than or equal to 12 mm, and L2 is larger than or equal to 6 and smaller than or equal to 130 mm; the orthographic projection hollow area S1 of the skeleton is 10-2000 mm < 2 >. The plastic product has excellent structural strength and permeation efficiency, the ring stiffness is not lower than 0.25 KN / m < 2 >, the maximum deformation is 30-50%, and the permeation rate is 30-80%.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic products, and in particular to a plastic product and a preparation method and application thereof. Background Art

[0002] Current cylindrical plastic products are usually designed into a tic-tac-toe structure. Such a tic-tac-toe-shaped plastic product has great limitations in actual use: on the one hand, the bearing capacity of the structure is limited; on the other hand, the manufacturing process is complicated and the production cost is high.

[0003] In addition, the traditional perforated pipes on the market have low penetration efficiency, and the conventional means of increasing the pipe diameter only increases the contact area between the pipe wall and the fluid, but cannot improve the penetration efficiency. Therefore, providing a plastic product with high structural strength, excellent penetration efficiency and suitable for actual production is an urgent problem to be solved in this technical field. Summary of the invention

[0004] The purpose of the present invention is to overcome the problems of low structural strength and poor penetration efficiency of plastic products in the prior art, and to provide a plastic product and its preparation method and application. The plastic product has excellent structural strength and penetration efficiency, and the ring stiffness is not less than 0.25KN / m 2 , the maximum deformation is 30-50%, and the permeability is 30%-80%.

[0005] In order to achieve the above-mentioned object, the first aspect of the present invention provides a plastic product, wherein the plastic product comprises N skeletons and M reinforcing ribs perpendicular to the skeleton per unit length along the axial direction, N≥60, M≥12;

[0006] Wherein, the skeleton is annular and / or polygonal;

[0007] Among them, the distance between the Nth frame and the N-1th frame is L1, the distance between the Mth reinforcement rib and the M-1th reinforcement rib is L2, 1≤L1≤12mm, 6≤L2≤130mm;

[0008] The orthographic hollow area S1 of the skeleton is 10-2000cm 2 .

[0009] A second aspect of the present invention provides a method for preparing a plastic product, comprising the following steps:

[0010] (1) Extruding polymer materials separately to obtain a skeleton and reinforcing ribs;

[0011] (2) Compounding the N′ skeletons and the M′ reinforcing ribs to obtain a preform;

[0012] (3) cooling the preform to obtain the plastic product;

[0013] Wherein, in step (2), the distance between the Nth frame and the N-1th frame is L1', the distance between the Mth reinforcing rib and the M-1th reinforcing rib is L2', 1≤L1≤12mm, 6≤L2≤130mm;

[0014] The orthographic projection hollow area S1' of the skeleton is 10-2000cm 2 ;

[0015] Wherein, the cooling conditions include: cooling from a temperature above the melting point of the polymer to 25-30°C at a cooling rate of 15-35°C / min;

[0016] N'≥60, M'≥12.

[0017] The third aspect of the present invention provides a plastic product produced by the above-mentioned preparation method of the present invention.

[0018] A fourth aspect of the present invention provides application of the above-mentioned plastic product in water treatment.

[0019] Through the above technical solution, the plastic product provided by the present invention has excellent structural strength and penetration efficiency. Specifically, the ring stiffness is not less than 0.25KN / m 2 , the maximum deformation is 30-50%, the permeability is 30%-80%, and it is suitable for actual production. DETAILED DESCRIPTION

[0020] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0021] A first aspect of the present invention provides a plastic product, wherein the plastic product comprises N skeletons and M reinforcing ribs perpendicular to the skeleton per unit length along the axial direction, N≥60, M≥12;

[0022] Wherein, the skeleton is annular and / or polygonal;

[0023] Among them, the distance between the Nth frame and the N-1th frame is L1, the distance between the Mth reinforcement rib and the M-1th reinforcement rib is L2, 1≤L1≤12mm, 6≤L2≤130mm;

[0024] The orthographic hollow area S1 of the skeleton is 10-2000cm 2 .

[0025] In the present invention, the inventors found that specific L1 and L2 can improve the structural strength and penetration efficiency of plastic products.

[0026] In the present invention, the inventors found that within a specific range, the more N, the stronger the load-bearing capacity and the greater the ring stiffness, and the more M, the higher the bending strength of the skeleton in length.

[0027] In the present invention, the reinforcing ribs can be connected to the frame, and the bending strength of the plastic product can be controlled by controlling the number and cross-sectional area of ​​the reinforcing ribs. Generally, the bending strength of the plastic product is proportional to the number and cross-sectional area of ​​the reinforcing ribs.

[0028] In the present invention, the orthographic projection of the skeleton refers to the projection parallel to the axial direction of the skeleton. Taking a circular ring skeleton as an example, the radius of the outer circle of the orthographic projection of the circular ring skeleton is equal to the outer diameter of the circular ring skeleton, and the radius of the inner circle of the orthographic projection of the circular ring skeleton is equal to the inner diameter of the circular ring skeleton. The hollow area is the difference between the area of ​​the outer circle of the orthographic projection and the area of ​​the inner circle of the orthographic projection.

[0029] In the present invention, the axial direction is the direction of the line connecting the center points of the skeleton.

[0030] In the present invention, the unit length is 1 meter (m).

[0031] In the present invention, the ring shape is not limited to a circle or an ellipse, but also includes a one-dimensional plane figure with an arc section, such as a rounded rectangle.

[0032] In the present invention, the plastic product meeting the above definition has excellent structural strength and permeability efficiency.

[0033] In some embodiments of the present invention, preferably, N≥65 and M≥14.

[0034] More preferably, N is 65-90 and M is 14-18.

[0035] In some embodiments of the present invention, preferably, 7≤L1≤10mm, 30≤L2≤100mm.

[0036] More preferably, 8≤L1≤9mm, 40≤L2≤90mm.

[0037] In some embodiments of the present invention, preferably, the orthographic hollow area S1 of the skeleton is 15-1962.5 cm 2 .

[0038] More preferably, the orthographic hollow area S1 of the skeleton is 19.625-965 cm2 .

[0039] According to the present invention, the length of the plastic product is 1-20 m, preferably 4-12 m.

[0040] According to the present invention, along the axial direction of the plastic product, L1 is a constant value.

[0041] According to the present invention, L2 is a constant value along the direction perpendicular to the axis of the plastic product.

[0042] According to the present invention, the density of the plastic product is 0.8-1.2 g / cm 3 , preferably 0.9-1.0g / cm 3 .

[0043] According to the present invention, the outer diameter of the cross section or the circumscribed circle diameter of the plastic product is 50-500 mm, preferably 50-350 mm.

[0044] In the present invention, when the skeleton is annular, the outer diameter of the plastic product is 50-500 mm, preferably 50-350 mm.

[0045] In the present invention, when the skeleton is polygonal, the diameter of the circumscribed circle of the plastic product is 50-500 mm, preferably 50-350 mm.

[0046] According to the present invention, the polygon is a triangle, a rectangle or a regular pentagon.

[0047] According to the present invention, the ring shape is a rounded rectangle or a circle.

[0048] In the present invention, when the frame is a rounded rectangle, the outer diameter of the frame is the length of the diagonal line of the rounded rectangle.

[0049] According to a preferred embodiment of the present invention, the skeleton is circular.

[0050] According to the present invention, the cross-sectional diameter or the circumscribed circle diameter of the skeleton is 5-10 mm, preferably 6-10 mm.

[0051] In the present invention, when the cross section of the skeleton is annular, the cross section diameter of the skeleton is 5-10 mm, preferably 6-10 mm.

[0052] In the present invention, when the cross section of the skeleton is polygonal, the diameter of the circumscribed circle of the skeleton is 5-10 mm, preferably 6-10 mm.

[0053] According to the present invention, the cross-sectional diameter or the circumscribed circle diameter of the reinforcing rib is 5-10 mm, preferably 5-8 mm.

[0054] In the present invention, when the cross section of the reinforcing rib is annular, the cross section diameter of the reinforcing rib is 5-10 mm, preferably 5-8 mm.

[0055] In the present invention, when the cross section of the reinforcing rib is polygonal, the diameter of the circumscribed circle of the reinforcing rib is 5-10 mm, preferably 5-8 mm.

[0056] The thickness of the plastic product is 10-20 mm, preferably 11-18 mm.

[0057] In the present invention, the thickness of the plastic product = the inner diameter of the cross section or the diameter of the circumscribed circle of the frame + the inner diameter of the cross section or the diameter of the circumscribed circle of the reinforcing rib.

[0058] According to the present invention, the frame and the reinforcing ribs are independently made of polymer materials.

[0059] According to the present invention, the elastic modulus of the polymer material is greater than or equal to 800 MPa.

[0060] According to the present invention, the polymer material is polyolefin, preferably at least one of polyethylene, polypropylene and fiber-reinforced polypropylene.

[0061] According to the present invention, the skeleton is made of a polymer material with an elastic modulus greater than or equal to 900 MPa.

[0062] According to the present invention, the reinforcing rib is made of a polymer material having an elastic modulus greater than or equal to 800 MPa.

[0063] According to the present invention, the ring stiffness of the plastic product is not less than 0.25 KN / m 2 , the maximum deformation is 30-50%, the permeability is 30%-80%, preferably 30%-70%. DETAILED DESCRIPTION

[0065] In a specific embodiment of the present invention, the plastic product comprises N skeletons and M reinforcing ribs perpendicular to the skeleton per unit length along the axial direction, N is 65-90, and M is 14-18;

[0066] Wherein, the skeleton is circular;

[0067] 8≤L1≤9mm,40≤L2≤90mm;

[0068] The orthographic projection hollow area S1 of the skeleton is 19.625-961.625 cm 2 .

[0069] According to the present invention, the length of the plastic product is 4-12m.

[0070] According to the present invention, the density of the plastic product is 0.9-1.0 g / cm 3 .

[0071] According to the present invention, the outer diameter of the cross section of the plastic product is 50-350 mm.

[0072] According to the present invention, the cross-sectional diameter of the skeleton is 6-10 mm.

[0073] According to the present invention, the cross-sectional diameter of the reinforcing rib is 5-8 mm.

[0074] The thickness of the plastic product is 10-20 mm, preferably 11-18 mm.

[0075] According to the present invention, the skeleton is made of a polymer material with an elastic modulus greater than or equal to 900 MPa.

[0076] According to the present invention, the reinforcing rib is made of a polymer material having an elastic modulus greater than or equal to 800 MPa.

[0077] According to the present invention, the ring stiffness of the plastic product is not less than 0.6 KN / m 2 , the maximum deformation is 30-50%, and the permeability is 40%-70%.

[0078] A second aspect of the present invention provides a method for preparing a plastic product, comprising the following steps:

[0079] (1) Extruding polymer materials separately to obtain a skeleton and reinforcing ribs;

[0080] (2) Compounding the N′ skeletons and the M′ reinforcing ribs to obtain a preform;

[0081] (3) cooling the preform to obtain the plastic product;

[0082] Wherein, in step (2), the distance between the Nth frame and the N-1th frame is L1', the distance between the Mth reinforcing rib and the M-1th reinforcing rib is L2', 1≤L1'≤12mm, 6≤L2'≤130mm;

[0083] The orthographic projection hollow area S1' of the skeleton is 10-2000cm 2 ;

[0084] Wherein, the cooling conditions include: cooling from a temperature above the melting point of the polymer to 25-30°C at a cooling rate of 15-35°C / min;

[0085] N'≥60, M'≥12.

[0086] In the present invention, the preform is cooled by combining air cooling and water cooling.

[0087] According to a preferred embodiment of the present invention, the extrusion is performed by reciprocating extrusion molding.

[0088] According to a preferred embodiment of the present invention, the temperature is rapidly cooled from 175-185°C to 25-30°C at a cooling rate of 20-35°C / min.

[0089] According to the present invention, the extrusion conditions include: the extruder processing temperature is 170-190° C., and the heating time is 1-1.5 h.

[0090] According to the present invention, the compounding in step (2) enables the reinforcing ribs to be located inside the frame.

[0091] According to the present invention, the elastic modulus of the polymer material is greater than or equal to 800 MPa.

[0092] According to the present invention, the polymer material is polyolefin, preferably at least one of polyethylene, polypropylene and fiber-reinforced polypropylene.

[0093] According to the present invention, the skeleton is made of a polymer material with an elastic modulus greater than or equal to 900 MPa.

[0094] According to the present invention, the reinforcing rib is made of a polymer material having an elastic modulus greater than or equal to 800 MPa.

[0095] According to the present invention, the Poisson's ratio of the polymer material is 0.3-0.5.

[0096] In the present invention, the elastic modulus is measured according to standard ISO 527.

[0097] In the present invention, the Poisson's ratio is measured according to the standard GB / T 3354-1999. DETAILED DESCRIPTION

[0099] In one embodiment of the present invention, a method for preparing a plastic product comprises the following steps:

[0100] (1) Extruding polymer materials separately to obtain a skeleton and reinforcing ribs;

[0101] (2) Compounding the N′ skeletons and the M′ reinforcing ribs to obtain a preform;

[0102] (3) cooling the preform to obtain the plastic product;

[0103] N' is 65-90, M' is 14-18;

[0104] Wherein, the skeleton is circular;

[0105] 8≤L1'≤9mm,40≤L2'≤90mm;

[0106] The orthographic projection hollow area S1' of the skeleton is 19.625-961.625cm 2 ;

[0107] According to the present invention, the temperature is rapidly cooled from 175-185°C to 25-30°C at a cooling rate of 20-35°C / min.

[0108] According to the present invention, the extrusion conditions include: the extruder processing temperature is 170-190° C., and the heating time is 1-1.5 h.

[0109] According to the present invention, the compounding in step (2) enables the reinforcing ribs to be located inside the frame.

[0110] According to the present invention, the polymer material is polyethylene.

[0111] According to the present invention, the skeleton is made of a polymer material with an elastic modulus greater than or equal to 900 MPa.

[0112] According to the present invention, the reinforcing rib is made of a polymer material having an elastic modulus greater than or equal to 800 MPa.

[0113] According to the present invention, the Poisson's ratio of the polymer material is 0.3-0.5.

[0114] The third aspect of the present invention provides a plastic product produced by the above-mentioned preparation method of the present invention.

[0115] The fourth aspect of the present invention provides the use of the plastic product described in the first aspect and the third aspect of the present invention in water treatment.

[0116] The present invention will be described in detail below by way of examples. In the following examples and comparative examples,

[0117] The ring stiffness of plastic products is measured according to standard GB / T 9647-2015;

[0118] The maximum deformation of plastic products was measured according to the standard GB / T 9647-2015, using a plastic ring stiffness testing machine (Shandong Jining Dingdong Equipment Co., Ltd., model cm20), and the test conditions were: 23±2℃;

[0119] The permeable surface area per unit length of plastic products is calculated by the formula S 渗 =S 实 -L 环 *Φ 管壁外径 *π*N 1 -L竖 *L1*N 2 , unit is (cm 2 / m);

[0120] S 渗 is the water seepage area on the pipe wall per unit length of 1m (cm 2 / m);

[0121] S 实 The surface area per unit length of a solid wall pipe with the same diameter or circumscribed circle diameter of the plastic product (cm 2 );

[0122] L 环 is the cross-sectional diameter or circumscribed circle diameter of the skeleton (cm);

[0123] Φ 管壁外径 It is the outer diameter of the cross section or the diameter of the circumscribed circle of the plastic product (cm);

[0124] N 1 - Number of skeletons per 1m unit length;

[0125] L 竖 - Reinforcement cross-sectional diameter or circumscribed circle diameter (cm);

[0126] N 2 -The number of reinforcing ribs on a single frame;

[0127] The penetration efficiency is S 渗 With S 实 ratio*100;

[0128] The raw materials used in the examples and comparative examples are all commercially available products.

[0129] Example 1

[0130] (1) High-density polyethylene (polymer material) with an elastic modulus of 950 MPa and a Poisson's ratio of 0.38 is heated and extruded to obtain reinforcing ribs and annular skeletons, respectively. The extrusion conditions are: extrusion molding, and the processing temperature is 190°C.

[0131] (2) A preform is obtained by compounding 76 skeletons with a diameter of 6 mm and 14 reinforcing ribs with a diameter of 8 mm, with L1 being 8.16 mm and L2 being 80.3 mm;

[0132] (3) The preform is cooled from 180°C to 50°C at a cooling rate of 25°C / min under air cooling and water cooling conditions to obtain plastic product A1. The outer diameter of plastic product A1 is 350 mm, the thickness is 15 mm, the length is 12 m, and the orthographic projection hollow area of ​​the skeleton is 961.625 cm 2 The dimensional parameters and test results are shown in Table 1 below.

[0133] Example 2

[0134] A plastic product was prepared according to the preparation method of Example 1, except that there were 18 reinforcing ribs with a diameter of 6 mm. The obtained plastic product A8 had an outer diameter of 92 mm, a thickness of 18 mm, a length of 5 m, and a hollow area of ​​the orthographic projection of the skeleton of 66.44 cm 2 The dimensional parameters and test results are shown in Table 1 below.

[0135] Example 3

[0136] A plastic product was prepared according to the preparation method of Example 1, except that there were 60 skeletons with a diameter of 5 mm and 14 reinforcing ribs with a diameter of 6 mm, to obtain a plastic product A3. The outer diameter of the plastic product A3 was 100 mm, the thickness was 11 mm, the length was 5 m, and the hollow area of ​​the orthographic projection of the skeleton was 78.5 cm 2 The dimensional parameters and test results are shown in Table 1 below.

[0137] Example 4

[0138] A plastic product was prepared according to the preparation method of Example 1, except that there were 80 skeletons with a diameter of 5 mm and 14 reinforcing ribs with a diameter of 6 mm, to obtain a plastic product A4. The outer diameter of the plastic product A4 was 500 mm, the thickness was 12 mm, the length was 11 m, and the hollow area of ​​the orthographic projection of the skeleton was 1962.5 cm 2 The dimensional parameters and test results are shown in Table 1 below.

[0139] Example 5

[0140] The plastic product A5 was prepared according to the preparation method of Example 1, except that: a high-density polyethylene with an elastic modulus of 1200 MPa and a Poisson's ratio of 0.39 was used, 70 skeletons, a diameter of 5 mm, a reinforcing rib diameter of 6 mm, and a cooling rate of 20°C / min. The outer diameter of the plastic product A5 was 200 mm, the thickness was 18 mm, the length was 4 m, and the orthographic projection hollow area of ​​the skeleton was 314 cm 2 The dimensional parameters and test results are shown in Table 1 below.

[0141] Example 6

[0142] A plastic product A6 was prepared according to the preparation method of Example 1, except that: there were 65 skeletons with a diameter of 5 mm, a cooling rate of 30°C / min, 12 reinforcing ribs with a diameter of 9 mm, and the obtained plastic product A6 had an outer diameter of 300 mm, a thickness of 14 mm, a length of 6 m, and a hollow area of ​​the orthographic projection of the skeleton of 706.5 cm 2The dimensional parameters and test results are shown in Table 1 below.

[0143] Example 7

[0144] A plastic product was prepared according to the preparation method of Example 1, except that L1 and L2 were different. A plastic product A7 was obtained. The outer diameter of the plastic product A7 was 350 mm, the thickness was 15 mm, the length was 15 m, and the orthographic projection hollow area of ​​the skeleton was 961.625 cm 2 The dimensional parameters and test results are shown in Table 1 below.

[0145] Example 8

[0146] A plastic product was prepared according to the preparation method of Example 7, except that polyethylene with an elastic modulus of 1000 MPa and a Poisson's ratio of 0.40 was used to obtain plastic product A8. The outer diameter of plastic product A8 was 350 mm, the thickness was 15 mm, the length was 15 m, and the orthographic projection hollow area of ​​the skeleton was 961.625 cm 2 The dimensional parameters and test results are shown in Table 1 below.

[0147] Comparative Example 1

[0148] According to step (1) of Example 1, a pipe with a diameter of 74 mm was obtained. Holes were punched on the surface of the pipe, with a hole diameter of 7.6 mm, a spacing of 4.6 mm along the circumference of the pipe, and a hole spacing of 1.4 mm along the axial direction of the pipe. The thickness was 15 mm, and a plastic product D1 with a length of 12 m was obtained. The dimensional parameters and test results are shown in Table 1 below.

[0149] Comparative Example 2

[0150] A plastic product was prepared according to the preparation method of Example 1, except that 30 skeletons were used to obtain a plastic product D2. The outer diameter of the plastic product D2 was 350 mm, the thickness was 15 mm, the length was 12 m, and the orthographic projection hollow area of ​​the skeleton was 961.625 cm 2 The dimensional parameters and test results are shown in Table 1 below.

[0151] Comparative Example 3

[0152] A plastic product was prepared according to the preparation method of Example 1, except that the number of reinforcing ribs was 10, and a plastic product D3 was obtained. The outer diameter of the plastic product D3 was 350 mm, the thickness was 15 mm, the length was 12 m, and the orthographic projection hollow area of ​​the skeleton was 961.625 cm 2 The dimensional parameters and test results are shown in Table 1 below.

[0153] Table 1

[0154]

[0155] It can be seen from the results in Table 1 that Examples 1-8 using the plastic products provided by the present invention have both excellent structural strength and penetration efficiency, which are specifically reflected in excellent ring stiffness, maximum deformation and high penetration efficiency, and can be used as pipes for water treatment processes. In addition, the preparation method of the plastic products provided by the present invention has a simple process and low production cost, can effectively control product quality and manufacturing cost, and has high industrial value.

[0156] Compared with Example 7, in Example 1, L1 and L2 are within a specific range, so that the structural strength and penetration efficiency of the plastic product are more excellent.

[0157] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A plastic product, characterized in that: The plastic product comprises N skeletons and M reinforcing ribs perpendicular to the skeletons per unit length along the axial direction, N≥60, M≥12; Wherein, the skeleton is annular and / or polygonal; Among them, the distance between the Nth frame and the N-1th frame is L1, the distance between the Mth reinforcement rib and the M-1th reinforcement rib is L2, 1≤L1≤12mm, 6≤L2≤130mm; The orthographic hollow area S1 of the skeleton is 10-2000cm 2 .

2. The plastic product according to claim 1, wherein: 7≤L1≤10mm,30≤L2≤90mm; Preferably, the orthographic hollow area S1 of the skeleton is 15-1962.5 cm 2 , more preferably 15-965cm 2 ; Preferably, the length of the plastic product is 1-20 m, preferably 4-12 m; Preferably, along the axial direction of the plastic product, L1 is a constant value; Preferably, along the direction perpendicular to the axis of the plastic product, L2 is a constant value; Preferably, the outer diameter of the cross section or the outer diameter of the circumscribed circle of the plastic product is 50-500 mm, preferably 50-350 mm.

3. The plastic product according to claim 1 or 2, wherein: The polygon is a triangle, a rectangle or a regular pentagon; Preferably, the ring shape is a rounded rectangle or a circle; Preferably, the skeleton is circular.

4. The plastic product according to any one of claims 1 to 3, wherein: The cross-sectional diameter or circumscribed circle diameter of the skeleton is 5-10 mm, preferably 6-10 mm; Preferably, the cross-sectional diameter or the circumscribed circle diameter of the reinforcing rib is 5-10 mm, preferably 5-8 mm; Preferably, the plastic product has a thickness of 10-20 mm, preferably 11-18 mm.

5. The plastic product according to any one of claims 1 to 4, wherein: The frame and the reinforcing ribs are independently made of polymer materials; Preferably, the elastic modulus of the polymer material is greater than or equal to 800 MPa; Preferably, the polymer material is a polyolefin, preferably at least one of polyethylene, polypropylene and fiber-reinforced polypropylene; Preferably, the skeleton is made of a polymer material having an elastic modulus greater than or equal to 900 MPa; Preferably, the reinforcing rib is made of a polymer material having an elastic modulus greater than or equal to 800 MPa; Preferably, the ring stiffness of the plastic product is not less than 0.25 KN / m 2 , the maximum deformation is 30-50%, the permeability is 30%-80%, preferably 30%-70%.

6. A method for preparing a plastic product, characterized in that: The following steps are involved: (1) Extruding polymer materials separately to obtain a skeleton and reinforcing ribs; (2) Compounding the N' skeletons and the M' reinforcing ribs to obtain a preform; (3) cooling the preform to obtain the plastic product; Wherein, in step (2), the distance between the Nth frame and the N-1th frame is L1', the distance between the Mth reinforcing rib and the M-1th reinforcing rib is L2', 1≤L1'≤12mm, 6≤L2'≤130mm; The orthographic hollow area S1' of the skeleton is 10-2000mm 2 ; Wherein, the cooling conditions include: cooling from a temperature above the melting point of the polymer to 25-30°C at a cooling rate of 15-35°C / min; N'≥60, M'≥12.

7. The preparation method according to claim 6, wherein: The cooling conditions include: rapidly cooling from 175-185°C to 25-30°C at a cooling rate of 15-35°C / min; Preferably, the extrusion conditions include: a temperature of 170-190° C. and a heating time of 1-1.5 h.

8. The preparation method according to claim 6 or 7, wherein: The compounding of step (2) makes the reinforcing ribs located inside the frame; Preferably, the elastic modulus of the polymer material is greater than or equal to 800 MPa; Preferably, the polymer material is a polyolefin, preferably at least one of polyethylene, polypropylene and fiber-reinforced polypropylene; Preferably, the skeleton is made of a polymer material having an elastic modulus greater than or equal to 900 MPa; Preferably, the reinforcing rib is made of a polymer material having an elastic modulus greater than or equal to 800 MPa; Preferably, the Poisson's ratio of the polymer material is 0.3-0.

5.

9. A plastic product obtained by the preparation method according to any one of claims 6 to 8.

10. Use of the plastic product according to any one of claims 1 to 5 and 9 in water treatment.

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