Process for producing oriented anti-aging environmentally friendly co-extruded crjqbo pipe

Abstract

The application discloses a production method of an oriented anti-aging environment-friendly co-extrusion CRJQBO pipe, and comprises the following steps: S1, formula raw materials of a PVC-0 pipe are mixed and then added into a single-screw extruder or a double-screw extruder, and after being sufficiently plasticized and extruded, the materials enter an online biaxial orientation PVC extrusion molding die; S2, after being twice compressed, the materials enter a pipe blank molding area, an axial expansion transition area and a ring expansion transition area in sequence; and S3, after being again shaped by a compression roller, cooled, pulled and cut, the oriented anti-aging environment-friendly co-extrusion CRJQBO pipe is obtained. In the application, the CRJQBO pipe is an oriented anti-aging environment-friendly co-extrusion CRJQBO pipe produced through a second research and development innovation based on a PVC-0 online biaxial orientation production technology, compared with existing PVC-0 series pipes, the application solves the problems of performance attenuation and color change of ordinary PVC-0 series pipes during outdoor storage and use, such as wind blowing, sunlight and rain, and the surface co-extrusion Chinese red epoxy polymer layer has excellent performances of anti-ultraviolet, anti-corrosion, anti-aging and anti-attenuation.

Description

Technical Field

[0001] This invention relates to the field of PVC pipe technology, and in particular to a production method for oriented, anti-aging, environmentally friendly co-extruded CRJQBO pipe. Background Technology

[0002] Due to its advantages such as high modulus, high strength and low price, PVC pipes have always been the most widely used plastic piping system in the world and have been widely used in many fields of modern society. PVC pipes are produced by extrusion molding, which includes a distribution zone, compression zone, forming zone, expansion zone and shaping zone.

[0003] Traditional extrusion molding uses a traction machine to axially stretch PVC pipes. Biaxially oriented PVC pipes are produced by axially and radially stretching the PVC pipes produced by the extrusion method, causing the long-chain PVC molecules in the pipe to be arranged regularly in both directions. This results in a new type of PVC pipe with high strength, high toughness, high impact resistance, and fatigue resistance, with performance far superior to ordinary PVC pipes. However, PVC pipes obtained by the above two processes have problems such as limited lifespan and performance degradation. For example, ordinary PVC-O series pipes experience performance degradation and color changes when stored and used outdoors, exposed to wind, sun, and rain.

[0004] Therefore, this invention provides a production method for orientation-oriented anti-aging environmentally friendly co-extruded CRJQBO pipe. The method involves co-extruded a Chinese red epoxy polymer layer on the surface of existing PVC-O series pipes, which has excellent properties such as UV resistance, corrosion resistance, aging resistance, and degradation resistance. This reduces the storage and stacking environment and transportation requirements of the pipes, meets the requirements for use in marine transportation and harsh environmental conditions, and makes the pipes have a longer service life, better performance, and higher reliability. Summary of the Invention

[0005] To address the technical problems mentioned in the background section, a method for producing orientation-oriented, anti-aging, environmentally friendly co-extruded CRJQBO pipes is proposed.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The production method of orientation-oriented, anti-aging, and environmentally friendly co-extruded CRJQBO pipe includes the following steps:

[0008] S1. The raw materials for PVC-0 pipe are mixed and then added to a single-screw extruder or a twin-screw extruder. After being fully plasticized and extruded, the mixture enters an online biaxially oriented PVC extrusion mold.

[0009] S2. After secondary compression, the material enters the tube blank forming zone, the axial expansion transition zone, and the circumferential expansion transition zone in sequence. In the tube blank forming zone, a Chinese red epoxy polymer layer is co-extruded on the surface of the tube blank. Axial stretching and orientation are achieved in the axial expansion transition zone, and circumferential stretching and orientation are achieved in the circumferential expansion transition zone. During the plasticizing process, the molecular structure is changed circumferentially and axially. Between the specific temperature and the melting temperature of the PVC material, the molecules of the material are rearranged through bidirectional stretching, so that the tube wall forms a network structure.

[0010] S3. After the material is shaped by pressure rollers, cooled, pulled and cut, oriented anti-aging environmentally friendly co-extruded CRJQBO pipe is obtained. The circumferential tensile strength of CRJQBO pipe is ≥60MPa, the axial tensile strength is ≥52MPa, the circumferential shrinkage rate after circumferential stretching at 135℃ for 1 hour is ≤5%, and the breaking tensile rate is ≥180%.

[0011] As a further description of the above technical solution:

[0012] The PVC-0 pipe formula does not contain color masterbatch or harmful stabilizers, and the CRJQBO pipe exhibits the natural golden color of PVC particles.

[0013] As a further description of the above technical solution:

[0014] The CRJQBO tube has an outer diameter of 75-160mm, a wall thickness of 2.5±0.2~8.0±0.5mm, and a ring stiffness of 10-50KN / m. 2 .

[0015] As a further description of the above technical solution:

[0016] The wall thickness of the CRJQBO pipe is half that of PVC pipe and PE pipe. The PVC pipe includes PVC-C, PVC-U and PVC-M pipes. The strength of the CRJQBO pipe is at least 4 times that of the PVC pipe.

[0017] As a further description of the above technical solution:

[0018] The CRJQBO tube has a lead content ≤0.005 mg / L, a chromium content ≤0.005 mg / L, a mercury content ≤0.005 mg / L, and an arsenic content ≤0.005 mg / L.

[0019] As a further description of the above technical solution:

[0020] The material density of the CRJQBO tube is 1.35-1.45 g / cm³. 3 The static friction coefficient is ≤0.35.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0022] 1. In this invention, the CRJQBO pipe is an orientation-based, anti-aging, environmentally friendly co-extruded CRJQBO pipe produced through another round of research and innovation based on PVC-O online biaxial orientation production technology. Compared with pipes produced by traditional extrusion processes, it significantly improves various properties of the pipe. Its key indicators, such as compressive strength, are increased by an average of 50%, tensile strength by an average of 30%, and elongation at break by an average of 40%. It solves the problem of the sharp decline in the impact performance of PVC at low temperatures, reducing energy consumption and carbon emissions. In addition to high strength, high toughness, high impact resistance, and crack resistance, the orientation-based, anti-aging, environmentally friendly co-extruded CRJQBO pipe also possesses the properties of high-strength, high-toughness, high-impact resistance, and crack resistance of PVC-O pipe. The superior performance of the O-series pipes represents the latest upgrade of PVC-O pipes for power and communication protection. Compared to existing PVC-O pipes, it solves the problems of performance degradation and color change when ordinary PVC-O pipes are stored and used outdoors, exposed to wind, sun, and rain. Its surface co-extruded Chinese red epoxy polymer layer has excellent properties such as UV resistance, corrosion resistance, aging resistance, and degradation resistance, reducing the requirements for pipe storage and transportation. It is especially suitable for use in long-term sea transportation and harsh environmental conditions, resulting in a longer service life, better performance, and higher reliability.

[0023] 2. In this invention, the orientation-oriented anti-aging environmentally friendly co-extruded CRJQBO pipe adopts a new environmentally friendly formula for PVC-O pipes. By using a higher-cost environmentally friendly formula, without adding color masterbatch or harmful stabilizers, the mass-produced pipes exhibit the natural color of the raw PVC particles, a golden yellow with a transparent feel. At the same time, a unique co-extrusion technology is incorporated, with an outer layer of Chinese red epoxy polymer. The technology and appearance are significantly different from white, blue, and red pipes on the market, comprehensively improving the quality of the pipes in terms of performance and appearance. The orientation-oriented anti-aging environmentally friendly co-extruded CRJQBO pipe has undergone testing for all 45 heavy metals and common pollutants, fully complying with national standards. It is a rare environmentally friendly and energy-saving new product on the market, which can be widely promoted for the construction of key green and environmentally friendly projects, benefiting society. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1

[0026] This invention provides a technical solution: a method for producing orientation-oriented, anti-aging, environmentally friendly co-extruded CRJQBO pipe, comprising the following steps:

[0027] S1. The raw materials for PVC-0 pipe are mixed and then added to a single-screw extruder or a twin-screw extruder. After being fully plasticized and extruded, the mixture enters an online biaxially oriented PVC extrusion molding die. The raw materials for PVC-0 pipe do not contain color masterbatch or harmful stabilizers, and the CRJQBO pipe exhibits the golden yellow color of PVC particles. The structure of the "online biaxially oriented PVC extrusion molding die" can be found in the patent with publication number "CN101670665B".

[0028] S2. After secondary compression, the material enters the tube blank forming zone, axial expansion transition zone, and circumferential expansion transition zone in sequence. In the tube blank forming zone, a Chinese red epoxy polymer layer is co-extruded on the tube blank surface. Axial stretching and orientation are achieved in the axial expansion transition zone, and circumferential stretching and orientation are achieved in the circumferential expansion transition zone. During the plasticizing process, the molecular structure is changed circumferentially and axially. Between the specific temperature and the melting temperature of the PVC material, the molecules of the material are rearranged through bidirectional stretching, so that the pipe wall forms a network structure that can withstand brittle fracture originating from micro-cracks in the material body or scratches on the pipe wall surface, thus significantly improving the strength, toughness, and crack resistance of the pipe.

[0029] S3. After the material is shaped by pressure rollers, cooled, pulled and cut, oriented anti-aging environmentally friendly co-extruded CRJQBO pipe is obtained.

[0030] First, the molecular structure of the pipe is changed from single orientation to double orientation, and from chain structure to network structure, realizing molecular reconstruction, enabling molecules to be arranged in an orderly and regular manner, improving product performance. Moreover, when stretched along the circumferential direction, its stress-strain curve is similar to that of metal materials, and its tensile strength is much higher than that of traditional plastic pipes.

[0031] Secondly, it effectively solves the problem of the sharp decline in the low-temperature impact performance of PVC pipes, so that the pipes still have good toughness below -20℃. Ordinary PVC pipes have a precipitous drop in impact strength at -5℃ and are very easy to break, while CRJQBO pipes can still be used for construction. The low-temperature impact strength and stress crack resistance are improved by more than 5 times.

[0032] When impact tests are conducted at -10℃, ordinary PVC-U (or PVC-M) pipes are easily broken, while CRJQBO pipes exhibit excellent low-temperature impact resistance without cracking, making it easy to distinguish genuine products from counterfeits.

[0033] In high-temperature oven tests, ordinary PVC pipes soften but do not shrink or shrink very little, while other types of PVC-O pipes shrink greatly and cannot be flared online. CRJQBO pipes can shrink less than 5% in an oven at 130℃ for one hour and can be flared online without cracking, making them very easy to distinguish from counterfeits.

[0034] The wall thickness of CRJQBO pipe is half that of PVC pipe and PE pipe. PVC pipe includes PVC-C, PVC-U and PVC-M pipes. The strength of CRJQBO pipe is at least four times that of PVC pipe. As can be seen from the wall thickness of pipes with the same ring stiffness, non-PVC-O pipes must increase their wall thickness to achieve the ring stiffness of PVC-O pipes. Therefore, when designing the ring stiffness of pipes, an upper limit is set on the wall thickness. Non-CRJQBO pipes cannot meet the requirements. Testing pipes of the same diameter and wall thickness can easily distinguish between genuine and counterfeit pipes, which is a manifestation of technological advantages that non-PVC-O technology cannot meet.

[0035] The production equipment for CRJQBO pipes differs significantly from that of ordinary PVC-U (or PVC-M). Ordinary PVC-U (or PVC-M) is unidirectional in its production process, using a cylindrical mold. CRJQBO pipes, however, employ biaxial orientation technology, resulting in a dual orientation. Whether produced offline in a two-step process or online in a one-step continuous process, the dual-oriented pipe exhibits a process of increasing in diameter. The two-step process requires first producing a blank pipe, cooling it, and then heating it up to expand it, clearly showing the pipe diameter increasing from small to large. The online one-step process uses a special conical mold fixture to achieve localized orientation, making it easily identifiable on-site.

[0036] CRJQBO pipe is an orientation-oriented, anti-aging, environmentally friendly co-extruded pipe produced based on PVC-O online biaxial orientation production technology. Through further research and innovation, it significantly improves various pipe properties compared to traditional extrusion processes. Key indicators such as compressive strength are increased by an average of 50%, tensile strength by an average of 30%, and elongation at break by an average of 40%. This solves the problem of PVC's drastic decline in impact performance at low temperatures, reducing energy consumption and carbon emissions. In addition to its high strength, high toughness, high impact resistance, and crack resistance, the orientation-oriented, anti-aging, environmentally friendly co-extruded CRJQBO pipe is also a high-strength, high-toughness, high-impact, and crack-resistant PVC-O series pipe. The superior performance of this pipe represents the latest upgrade of PVC-O pipes for power and communication protection. Compared with existing PVC-O series pipes, it solves the problems of performance degradation and color change of ordinary PVC-O series pipes when stored and used outdoors, such as in the presence of wind, sun, and rain. Its surface co-extruded Chinese red epoxy polymer layer has excellent properties such as UV resistance, corrosion resistance, aging resistance, and degradation resistance, reducing the requirements for storage and stacking environment and transportation of the pipes. It is especially suitable for use in long-term sea transportation and harsh environmental conditions, resulting in a longer service life, better performance, and higher reliability of the pipes.

[0037] Oriented anti-aging environmentally friendly co-extruded CRJQBO pipe adopts a new environmentally friendly formula of PVC-O pipe. By using a higher-cost environmentally friendly formula, without adding color masterbatch and harmful stabilizers, the mass-produced pipes present the natural color of the raw PVC particles, a golden yellow with a transparent feel. At the same time, a unique co-extrusion technology is incorporated, with an outer layer of Chinese red epoxy polymer. The technology and appearance are significantly different from white, blue, and red pipes on the market, improving the quality of the pipe in all aspects of performance and appearance. Oriented anti-aging environmentally friendly co-extruded CRJQBO pipe has undergone testing for all 45 heavy metals and common pollutants, fully complying with national standards. It is a rare environmentally friendly and energy-saving new product on the market, which can be widely promoted for the construction of key green and environmentally friendly projects, benefiting society.

[0038] The performance of CRJQBO pipe, PVC-C pipe, CM pipe, PVC-U pipe, galvanized steel pipe and fiberglass pipe was compared through various tests. The comparison results are shown in Table 1 below:

[0039] Table 1 Comparison of Pipe Material Performance

[0040]

[0041]

[0042] As can be seen from Table 1, the CRJQBO tube has the following characteristics:

[0043] (1) Green and environmentally friendly, the content of 45 kinds of heavy metals and common pollutants fully complies with national standards and achieves green and environmentally friendly performance.

[0044] (2) High strength, high toughness, impact resistance, and crack resistance improve the problems of plastic pipes being fragile and having poor compressive strength.

[0045] (3) It solves the problem of performance degradation and color change of ordinary PVC-O series pipes when stored and used outdoors, such as when exposed to wind, sun and rain.

[0046] (4) Its surface co-extruded Chinese red epoxy polymer layer has excellent properties of anti-ultraviolet, anti-corrosion, anti-aging and anti-attenuation, which reduces the storage and stacking environment and transportation requirements of the pipe, especially adapting to the requirements of long-term sea transportation and harsh environmental conditions, making the pipe have a longer service life, better performance and higher reliability.

[0047] (5) It is corrosion resistant, weather resistant, termite resistant, and can be used well in strong chemical corrosion environments such as acids and alkalis, as well as in various natural environments.

[0048] (6) High temperature resistance and good flame retardant properties.

[0049] (7) High insulation, with good electrical insulation properties.

[0050] (8) It is lightweight and easy to transport. It adopts a flared plug connection method, which makes construction convenient.

[0051] (9) Energy and material saving: Compared with PVC-C / U / M and PE, PVC-O has a thinner wall thickness under the same pressure, so less material can be used, resulting in lower energy consumption and carbon emissions. It is a sustainable pipe material.

[0052] Furthermore, the product performance of CRJQBO tubes is shown in Table 2 below:

[0053] Table 2 Product Performance Table of CRJQBO Pipe

[0054]

[0055] Table 3 CRJQBO Pipe Specifications

[0056]

[0057] Based on the data in Tables 2 and 3, and using the following standards: GB / T 9647-2015 "Determination of Ring Stiffness of Thermoplastic Pipes", GB / T 14152-2001 "Test Method for Impact Resistance of Thermoplastic Pipes - Clockwise Rotation Method", GB / T 6671-2001 "Determination of Longitudinal Shrinkage Rate of Thermoplastic Pipes", YD / T 841.1-2016 "Plastic Pipes for Underground Communication Conduits - Part 1: General Rules", GB / T 8804.2-2003 "Determination of Tensile Properties of Thermoplastic Pipes - Part 2: Rigid Polyvinyl Chloride (PVC-U), Chlorinated Polyvinyl Chloride (PVC-C) and High Impact Polyvinyl Chloride (PVC-HI) Pipes", GB / T 1033.1-2008 "Determination of Density of Non-Foamed Plastics - Part 1: Immersion Method, Liquid Specific Gravity Bottle Method and Titration Method", GB / T Based on the inspection standard 6111-2018 "Determination of Internal Pressure Resistance of Thermoplastic Piping Systems for Fluid Transportation", the product performance of CRJQBO pipes was inspected, and the inspection report data is shown in Table 4 below:

[0058] Table 4 Performance Test Report of CRJQBO Pipe

[0059]

[0060]

[0061] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. Process for the production of oriented anti-aging environmentally friendly co-extruded CRJQBO pipes, characterized by, The method comprises the following steps: S1, after the formula raw materials of PVC-0 pipe are mixed, they are added into a single screw extruder or a double screw extruder, and then are extruded after being sufficiently plasticized and enter an online biaxial orientation PVC extrusion molding die; S2, after the materials are twice compressed, they enter a pipe blank molding area, an axial expansion transition area and a ring expansion transition area in sequence, wherein, in the pipe blank molding area, a Chinese red epoxy polymer layer is co-extruded on the surface of the pipe blank, axial stretching orientation is realized in the axial expansion transition area, ring stretching orientation is realized in the ring expansion transition area, the molecular structure is changed in the ring direction and the axial direction during the plasticizing production process, the molecules of the material are rearranged through biaxial stretching between the specific temperature and the melting temperature of the PVC material, so that the pipe wall forms a reticular structure; S3, after the materials are again shaped by a compression roller, cooled, pulled and cut, an oriented anti-aging environment-friendly co-extruded CRJQBO pipe is obtained, the ring tensile strength of the CRJQBO pipe is ≥60 MPa, the axial tensile strength is ≥52 MPa, the ring shrinkage rate after the ring is stretched for 1 h at 135℃ is ≤5%, and the breaking elongation rate is ≥180%; The formula raw materials of the PVC-0 pipe do not add color master batches and harmful stabilizers, and the CRJQBO pipe presents the golden yellow color of PVC particles; The lead content of the CRJQBO pipe is ≤0.005 mg / L, the chromium content is ≤0.005 mg / L, the mercury content is ≤0.005 mg / L, and the arsenic content is ≤0.005 mg / L.

2. The method of production of oriented anti-aging eco-friendly co-extruded CRJQBO pipe according to claim 1, characterized in that, The outer diameter of the CRJQBO pipe is 75-160 mm, the wall thickness is 2.5±0.2-8.0±0.5 mm, and the ring stiffness is 10-50 KN / m 2 .

3. The method of producing an oriented anti-aging eco-friendly co-extruded CRJQBO pipe according to claim 1, characterized in that, The material density of the CRJQBO tube is 1.35-1.45 g / cm 3 The static friction coefficient is ≤ 0.35.

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