CN109734988B - High-ring-stiffness inner-rib reinforced corrugated pipe and preparation method thereof - Google Patents
High-ring-stiffness inner-rib reinforced corrugated pipe and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a high-ring-stiffness inner rib reinforced corrugated pipe which is prepared by extruding and molding outer layer ingredients and inner layer ingredients through an extruder, wherein the outer layer ingredients comprise the following components in parts by weight: 85-100 parts of high-density polyethylene, 15-25 parts of polypropylene, 5-15 parts of filler, 1-2 parts of compatibilizer and 1-3 parts of color master batch; the inner layer comprises the following components in parts by weight: 85-100 parts of high-density polyethylene, 15-25 parts of polypropylene, 1-2 parts of compatibilizer and 1-3 parts of color master batch. Compared with the prior art, the inner rib reinforced corrugated pipe has higher ring stiffness and light weight, and greatly reduces the cost of raw materials.
Description
Technical Field
The invention relates to a corrugated pipe, in particular to a high-ring-stiffness inner rib reinforced corrugated pipe and a preparation method thereof.
Background
At present, the biggest hotspot of building water supply and drainage is the wide application of novel plastic pipes. The common drainage cast iron pipe and the traditional cement concrete pipe are replaced by the common drainage cast iron pipe and the traditional cement concrete pipe due to the reasons of easy corrosion, large self weight, inconvenient transportation and construction and the like. The plastic buried drainage pipeline has the advantages of light weight, corrosion resistance, good sealing performance, strong adaptability to changes of base planes, long service life, convenient transportation and installation, low construction cost and the like. The buried drainage pipeline is mainly applied to the fields of large-scale pollution discharge, exhaust, ventilation of subways, tunnels, mines and the like, low-pressure irrigation of farmlands and the like, has low requirement on the internal pressure bearing capacity of the pipeline, but has higher external pressure resistance.
The ring stiffness is a comprehensive parameter of the external pressure load resistance of the plastic buried drain pipe, and the numerical index of the ring stiffness is widely applied internationally to express the external pressure load resistance of the plastic buried drain pipe at present. If the loop stiffness of the tubing is too low, the tubing may deform excessively or buckle destabilization may occur. On the contrary, if the ring stiffness is selected too high, an excessively large section moment of inertia is inevitably adopted, which results in too much material and high cost. Therefore, on the premise of not increasing the manufacturing cost of the pipe, the double-wall corrugated pipe is invented, compared with a flat-wall pipe, the double-wall corrugated pipe has higher ring stiffness, strong external pressure load bearing capacity and good comprehensive performance under the condition of the same pipe diameter and sectional area, and mainly adopts High Density Polyethylene (HDPE) and rigid polyvinyl chloride (PVC-U) as main raw materials.
The HDPE double-wall corrugated pipe has the characteristics of strong corrosion resistance, difficult scaling on the surface, small friction resistance, excellent weather resistance, good processability, long service life (generally about 50 years underground and about 25 years in the air) and the like, and is widely applied. However, the biggest problems in the application of the existing buried HDPE double-wall corrugated pipe, particularly the large-caliber HDPE double-wall corrugated pipe, are that the ring stiffness is low, the external pressure resistance is poor, the pipe is often buckled and deformed due to overlarge external pressure load, certain limitation is brought to plastic underground drainage pipelines applied to large and medium cities, and the application range of the plastic underground drainage pipelines is greatly limited.
For manufacturers, how to effectively improve the ring stiffness of the pipe and maintain other properties within a qualified range is a problem to be considered and solved urgently. On the premise of a certain extrusion process, the structure of the pipe and the mechanical properties of the plastic raw materials determine the mechanical properties of the product, so that the two aspects can be considered respectively. From the perspective of a pipe structure, the annular rigidity of the pipe can be improved by increasing the wall thickness of the inner wall and the outer wall, namely the meter weight of the pipe is increased, but the method has smaller operable space, on one hand, the wall thickness is too thick, the internal space of the pipe is reduced, the fluid passing performance is influenced, and the size requirement of the national standard on the internal diameter is not met; on the other hand, the increased material consumption can increase the production cost and the transportation cost and reduce the market competitiveness of the product. In view of raw materials, if the elastic modulus of the raw materials can be improved and other properties of the pipe product can be ensured to be in a qualified range, the problem of low ring stiffness can be solved.
Disclosure of Invention
The present invention is directed to solve the above problems and to provide an inner rib reinforced bellows having an ultra-high ring stiffness and a method for manufacturing the same.
The purpose of the invention is realized by the following technical scheme:
the high-ring-stiffness inner rib reinforced corrugated pipe is prepared by extruding and molding outer layer ingredients and inner layer ingredients through an extruder, wherein the outer layer ingredients comprise the following components in parts by weight: 85-100 parts of high-density polyethylene, 15-25 parts of polypropylene, 5-15 parts of filler, 1-2 parts of compatibilizer and 1-3 parts of color master batch; the inner layer comprises the following components in parts by weight: 85-100 parts of high-density polyethylene, 15-25 parts of polypropylene, 1-2 parts of compatibilizer and 1-3 parts of color master batch.
Preferably, the outer layer ingredients comprise the following components in parts by weight: 90-100 parts of high-density polyethylene, 20-25 parts of polypropylene, 10-15 parts of filler, 1-2 parts of compatibilizer and 1-3 parts of color master batch; the inner layer comprises the following components in parts by weight: 90-100 parts of high-density polyethylene, 20-25 parts of polypropylene, 1-2 parts of compatibilizer and 1-3 parts of color master batch.
Preferably, the filler is a mixture of 1-2: 1-2: 1-3 of calcium carbonate, SCM whiskers, and ultra-fine glass microspheres.
Preferably, the calcium carbonate is colloidal calcium carbonate obtained by surface modification of light calcium carbonate by a surface modifier.
Preferably, the particle size of the superfine glass beads is 3-5 μm.
Preferably, the SCM whiskers are produced by new materials ltd, shongyang, Sichuan.
Preferably, the compatibilizer is maleic anhydride grafted polypropylene.
Preferably, the color masterbatch is a black or blue color masterbatch.
Preferably, the high density polyethylene is PE80 grade or PE100 grade.
A preparation method of a high-ring-stiffness inner rib reinforced corrugated pipe specifically comprises the following steps:
(1) mixing the materials according to the inner layer and the outer layer, and respectively adding the raw materials into a high-speed mixer to be uniformly mixed;
(2) the uniformly mixed materials are respectively sent into an extruder, the materials are plasticized into a molten state under the action of heating and pressurizing, and corresponding tube blanks are extruded by machine head dies and sizing sleeves with different specifications;
(3) cooling and shaping the pipe by a corrugation module and a flaring module, cutting the pipe by a fixed length by a length counting device and a cutting device, and finally entering an automatic flaring machine to perform flaring processing on the head of the pipe to obtain the product.
The invention has the following characteristics:
1. the existing inner rib reinforced corrugated pipe is made of a single high-density polyethylene (HDPE) base material, the ring stiffness is not high, and the elastic modulus of polypropylene (PP) is higher than that of HDPE. Compared with PP, HDPE is more low temperature resistant and better in cold resistance effect, PP plastic is generally low temperature resistant about minus 20 ℃, HDPE polyethylene can be used at the temperature of minus 40 to 60 ℃ without cracking, and the stress whitening phenomenon cannot occur. The base material of the invention is compounded by 85-100 parts of high-density polyethylene and 15-25 parts of polypropylene, the advantages of the high-density polyethylene and the polypropylene are integrated, and the prepared corrugated pipe has better effect.
2. The structure of the corrugated pipe determines that the outer wall contributes more to the ring stiffness of a product, so the ring stiffness of the pipe is improved, the elastic modulus of the raw material of the outer wall is larger than that of the inner wall, the inner layer and outer layer ingredients of the inner rib reinforced corrugated pipe have different formulas, and the outer layer ingredients are added with the filler with high elastic modulus, so that the outer wall has larger stiffness, the original performance of the product can be changed to some extent by adding the filler, the stiffness and the strength of the pipe are gradually increased along with the gradual increase of the filler content, but the flexibility and the good processing performance of thermoplastic plastics can be lost to some extent, if the filler is added too much, the pipe can gradually lose the characteristics of the thermoplastic plastics, and the pipe wall can become brittle until extrusion molding is failed, so the weight part of the filler is limited to 5-15. Meanwhile, no filler is added in the inner wall ingredients, so that the inner wall has better flexibility and good processing performance, and the corrugated pipe has better performance on the whole.
3. The filler is a mixture of calcium carbonate, SCM whiskers and superfine glass beads, and colloidal calcium carbonate particles obtained through surface modification are fully and uniformly dispersed in the polyethylene matrix to form a stress concentration point, so that impact energy can be fully absorbed, the material is not structurally damaged when being subjected to external pressure, and the apparent elastic modulus of the mixed material is improved. Meanwhile, the added SCM whisker and the superfine glass beads have a synergistic effect, the SCM whisker has a one-dimensional single crystal structure, the diameter is 0.2-0.8 mu m, the length is 20-60 mu m, the SCM whisker has extremely high mechanical property, the tensile strength is up to 1.2 GPa, the tensile elastic modulus is up to 32GPa, and the SCM whisker has obvious reinforcing and stiffening effects; the superfine glass beads with the particle size of 3-5 microns can be filled and dispersed in high-density polyethylene (HDPE) and can form better interface combination with the HDPE after organic treatment, impact deformation energy can be absorbed under the action of stress, the brittle-ductile transformation of an HDPE matrix is promoted, and the inorganic rigid particles play a role in toughening, so that the creep rate of the corrugated pipe is lower, and the meter weight is lighter.
In addition, the invention can not only improve the ring stiffness of the pipe, but also greatly reduce the cost of raw materials.
Detailed Description
The present invention is described in detail below with reference to specific examples, but the present invention is not limited thereto in any way.
Example 1
The high-ring-stiffness inner-rib reinforced corrugated pipe is prepared by extruding and molding outer-layer ingredients and inner-layer ingredients through an extruder, and the specific formula is shown in table 1. Wherein, the filler is a mixture of 1: 1: 1, wherein the calcium carbonate is obtained by performing surface modification on light calcium carbonate by using an aluminate coupling agent, the particle size of the superfine glass microsphere is 3-5 mu m, and the SCM whisker is produced by novel materials of Sichuan Mianyang Zhengyang industry, Co. The compatibilizer is maleic anhydride grafted polypropylene, the color master batch is black color master batch, and the high-density polyethylene adopts PE80 grade.
The preparation method specifically comprises the following steps of: SHR type, a new department machinery plant, york harbor city; a double-screw extruder: model SHJ-50, tokyo jente electromechanical ltd; bellows production line: cincinnati X-type double-wall corrugated pipe extrusion production line.
(1) Mixing the materials according to the inner layer and the outer layer, and respectively adding the raw materials into a high-speed mixer to be uniformly mixed;
(2) the uniformly mixed materials are respectively sent into an extruder, the materials are plasticized into a molten state under the action of heating and pressurizing, and corresponding tube blanks are extruded by machine head dies and sizing sleeves with different specifications;
(3) and cooling and shaping the corrugated pipe by a corrugation module and a flaring module, cutting the pipe by a fixed length by a length measuring device and a cutting device, and finally entering an automatic flaring machine to flare the head of the pipe to obtain the product, wherein the diameter of the prepared corrugated pipe is 800mm, an X-shaped tensile testing machine is built by gold by using ring stiffness characterization equipment, and the test is carried out according to GB/T14152-2011, and specific results are shown in Table 2.
Example 2
The high-ring-stiffness inner-rib reinforced corrugated pipe is prepared by extruding and molding outer-layer ingredients and inner-layer ingredients through an extruder, and the specific formula is shown in table 1. Wherein, the filler is 2: 1: 2 calcium carbonate, SCM whiskers, and microglass microbeads, high density polyethylene grade PE100, the rest of which is the same as example 1, and the specific results are shown in table 2.
Example 3
The high-ring-stiffness inner-rib reinforced corrugated pipe is prepared by extruding and molding outer-layer ingredients and inner-layer ingredients through an extruder, and the specific formula is shown in table 1. Wherein, the filler is a mixture of 1: 1: 2 calcium carbonate, SCM whiskers, and microglass microbeads, the rest of example 1, the specific results are shown in table 2.
Examples 4 to 6
The specific formula of the corrugated pipe is shown in table 1, the rest is the same as that in example 1, and the specific result is shown in table 2.
Comparative example 1
The specific formula is shown in table 1, the preparation method is the same as that of example 1 without adding polypropylene into the ingredients, and the specific results are shown in table 2.
Comparative example 2
The specific formula is shown in table 1, the preparation method is the same as that of example 1 without adding high-density polyethylene in the ingredients, and the specific results are shown in table 2.
Comparative example 3
The specific formulation is shown in table 1, the ingredients are not added with filler, the rest is the same as the example 2, and the specific results are shown in table 2.
Comparative example 4
The specific formulation is shown in table 1, the filler used in the formulation is calcium carbonate single component, the rest is the same as example 2, and the specific results are shown in table 2.
As can be seen from Table 2, the ring stiffness of the large-size 800mm corrugated pipe prepared by the method is more than 8 kN/m2And the SN8 level requirement is met.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (5)
1. The high-ring-stiffness inner rib reinforced corrugated pipe is prepared by extruding and molding outer layer ingredients and inner layer ingredients through an extruder, and is characterized in that the outer layer ingredients comprise the following components in parts by weight: 85-100 parts of high-density polyethylene, 15-25 parts of polypropylene, 5-15 parts of filler, 1-2 parts of compatibilizer and 1-3 parts of color master batch; the inner layer comprises the following components in parts by weight: 85-100 parts of high-density polyethylene, 15-25 parts of polypropylene, 1-2 parts of compatibilizer and 1-3 parts of color master batch; the high-density polyethylene adopts PE80 grade or PE100 grade; the filler is prepared from the following components in a mass ratio of 1-2: 1-2: 1-3 of a mixture of calcium carbonate, SCM whiskers, and ultra-fine glass microspheres; the calcium carbonate is colloidal calcium carbonate obtained by performing surface modification on light calcium carbonate by using a surface modifier; the particle size of the superfine glass beads is 3-5 mu m; the compatibilizer is maleic anhydride grafted polypropylene; the inner layer formulation does not include a filler.
2. The high ring stiffness inner rib reinforced corrugated pipe as claimed in claim 1, wherein the outer layer formulation comprises the following components in parts by weight: 90-100 parts of high-density polyethylene, 20-25 parts of polypropylene, 10-15 parts of filler, 1-2 parts of compatibilizer and 1-3 parts of color master batch; the inner layer comprises the following components in parts by weight: 90-100 parts of high-density polyethylene, 20-25 parts of polypropylene, 1-2 parts of compatibilizer and 1-3 parts of color master batch.
3. The high ring stiffness internal rib reinforced corrugated pipe of claim 1 or 2, wherein the SCM whiskers are produced by seiyang positive new materials ltd, Sichuan.
4. A high ring stiffness inner rib reinforced corrugated pipe as claimed in claim 1 or 2 wherein the color master is black or blue.
5. The preparation method of the high-ring-stiffness inner-rib reinforced corrugated pipe as claimed in claim 1 or 2, which comprises the following steps:
(1) mixing the materials according to the inner layer and the outer layer, and respectively adding the raw materials into a high-speed mixer to be uniformly mixed;
(2) the uniformly mixed materials are respectively sent into an extruder, the materials are plasticized into a molten state under the action of heating and pressurizing, and corresponding tube blanks are extruded by machine head dies and sizing sleeves with different specifications;
(3) cooling and shaping the pipe by a corrugation module and a flaring module, cutting the pipe by a fixed length by a length counting device and a cutting device, and finally entering an automatic flaring machine to perform flaring processing on the head of the pipe to obtain the product.
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| CN110513545A (en) * | 2019-08-30 | 2019-11-29 | 谭连平 | Plastic overmold two flat walls internal-rib steel band reinforced winding pipe material |
| CN111038006A (en) * | 2019-12-25 | 2020-04-21 | 上海新上化高分子材料有限公司 | Fresh air shield pipe and preparation method thereof |
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