â– Dialogue Characters Liu Hanliang, Marketing Manager, Hongyue Plastics Group Co., Ltd. (“Hongyueâ€). Once worked as a newspaper editor and reporter and published more than a thousand articles of various types. Liu Hanliang has been involved in the promotion and product marketing of the company since he entered Hongyue in 2008. He has also participated in the development and promotion of new products of Hongyue. As a successful transitioner from theoretical research to market operations, Liu Hanliang has always insisted on developing the floor heating market and popularizing warm culture from a strategic perspective. He has written a large number of articles on the healthy development of the floor heating industry and has received favorable comments from insiders.
â– Dialogue Motivation The emergence of chemical tubing has made it possible for large-scale applications of floor heating systems. The floor heating industry has thus entered a new era. It is the PE Xa that directly promotes this revolutionary change in the heating industry. Moreover, up to now, PE-Xa tubes have always been one of the best quality and best-of-mouth floor heating pipes in many chemical pipes. Therefore, for the development of the floor heating industry, the PE-Xa pipe is in great success. Unfortunately, due to many reasons, the PE Xa tube, which has contributed greatly to the development of the floor heating industry, has never been able to go out of the shadow of being too low. In some parts of China, it has even become a synonym for low-end products. In order to provide readers with in-depth understanding of PE-Xa management, our reporter recently interviewed Han Hanliang, marketing manager of Hongyue Plastics Group Co., Ltd., a leading brand company in the Chinese floor heating industry from 2008 to 2009.
â– Dialogue Record Record Reporter: Can you briefly introduce PE-Xa?
Liu Hanliang: PE Xa pipe is the abbreviation of peroxide cross-linked polyethylene pipe. It uses high-density polyethylene as the main raw material, organic peroxide as the cross-linking agent, and extrusion using a plunger extruder. Forming pipe. Many domestic and foreign research institutes have found that the heat resistance of PE Xa pipes is good based on a number of data experiments. PE-Xa pipe through one-step chemical crosslinking in the process of processing, so that the polymer molecular chain formed covalent, and then form a uniform network structure, significantly improve the physical and chemical properties of ordinary PE X pipe. Due to the medium temperature of this pipe conveying up to 95 °C, up to 110 °C in a short time, it is very suitable for the transport of various high temperature fluids. Therefore, the PE-Xa tube is scientifically based as a heating tube in a low-temperature hot water surface radiant heating system.
The raw materials and auxiliary materials of PE-Xa pipes mainly include high-density polyethylene, cross-linking agents, antioxidants and auxiliary antioxidants. There have been four brands of PE-Xa pipe special materials on the Chinese market: XL1800 from South Korea's LG Chemical Company, 8100GX from Hunan Petrochemical Company, P110P/T12 from South Korea's Samsung General Chemicals Corporation, and P300X from South Korea's Korean Petrochemical Industry Company . At present, the raw material suppliers of domestic PE-Xa pipe enterprises are mainly Korean LG Chemical Company and Hunan Petrochemical Company. Domestic cross-linking agents and antioxidants used by domestic PE Xa pipe manufacturing enterprises are divided into imported and domestic products. Among them, imported auxiliary materials are mainly known from the “Aksu†in the Netherlands, BASF in Germany, and “Ciba†in Switzerland. The chemical company offers. Practice has proved that imported cross-linking agents and antioxidants are relatively stable in quality and performance is better than domestic similar products. Because of this, the primary antioxidants and auxiliary antioxidants used by domestic heating pipe manufacturers that attach importance to product quality are basically imported from the aforementioned chemical companies.
Reporter: What technical conditions should PE Xa pipe products have before entering the market?
Liu Hanliang: To ensure that PE Xa can be used in hot water for a long period of time. High-density polyethylene (HDPE) base materials should be added simultaneously with cross-linking agents, main antioxidants, and auxiliary antioxidants. The proportion of the process formulation is: HDPE 99%, peroxides and primary and secondary antioxidants 1%. The mechanism is: under the condition of high temperature and high pressure, peroxide crosslinking agent is used to make chemical linkage between the long molecular chains of high-density polyethylene to achieve chemical cross-linking and become a three-dimensional network structure. Because the polyethylene molecule is unsaturated, it will slowly change after ultraviolet radiation or oxygen attack until the molecular bond breaks. Therefore, the main antioxidant and the auxiliary antioxidant must be added to improve its resistance to photoaging and antioxidant aging.
In terms of production control, due to the long mold and high internal pressure of the PE-Xa pipe, the wall thickness of the PE-Xa pipe tends to fluctuate greatly in the extrusion process. Moreover, because the PE-Xa tube is a continuous production, it is not easy to monitor at any time. Therefore, how to ensure the uniformity of the tube wall thickness is one of the key points of the PE-Xa tube production process. Because the PE-Xa resin is in powder form, and the cross-linking agent is liquid, the amount of cross-linking agent and antioxidant is very small, so whether the raw and auxiliary materials can be fully mixed is the key to whether the cross-linking degree of the PE Xa tube is uniform or not. . In addition, since the cross-linking reaction of the PE-Xa tube is rapidly completed in a very short time in a die having a diameter of several tens of centimeters, the mold temperature control is also one of the key points of the process control of the PE-Xa tube.
In terms of product testing, the inspection items that PE Xa pipe must complete include routine inspections such as type size, longitudinal recoil rate, degree of cross-linking, short-term hydrostatic test, and 5000 cycles of thermal cycling and 8760 hours of thermal stability.
Reporter: Are there any criteria for reference in the above technical conditions?
Liu Hanliang: At present, the product standard of domestic PE Xa tube is mainly referenced by GB/T18992-2003 “Crosslinked Polyethylene PE-X Pipe System for Hot and Cold Water†(abbreviated as “GB/T18992-2003â€), which clearly stipulates PE-Xa pipe cross-linking degree should be greater than or equal to 70%, heat resistance, creep resistance and stress cracking resistance should meet the following requirements: 20 °C / 12M MPa ≥ 1 hour; 95 °C / 4.8 MPa ≥ 1 hour; 95°C/4.6 MPa ≥165 hours; 95°C/4.4 MPa ≥1000 hours; 110°C/2.5 MPa ≥8760 hours.
In terms of product appearance, GB/T 18992-2003 stipulates that the inner and outer surfaces of the pipe should be smooth, flat, and clean, and there must be no obvious scratches, dents, bubbles, etc. that may affect product performance; the pipe wall should have no visible impurities, and the pipe surface The color should be uniform and no significant color difference is allowed; the end face of the pipe should be cut flat and perpendicular to the axis of the pipe. GB/T 18992.2-2003 also stipulates that the PE-Xa pipe used for the building heating system must complete the 90°C/1000 hour hydrostatic test.
The temperature of hot water in China's low-temperature hot water surface radiant heating system is usually 40 °C ~ 60 °C, and the design pressure is generally 0.4M MPa ~ 6 MPa. Due to the different temperatures and pressures experienced by the pipes in different seasons, it is difficult to calculate the stress of PE Xa pipes under such conditions. In this regard, domestic pipe enterprises are basically based on the provisions of ISO10508:1995 "Thermoplastic Pipes and Fittings for Hot and Cold Water Systems" (abbreviated as "ISO10508:1995"), and four of them are selected according to the conditions of use.
PE Xa pipe should be inspected strictly according to the project required by GB/T18992.2-2003 standard. For the standard, there is no mention about the issue of wall thickness deviation rate. All manufacturers can refer to the construction industry standard CJ/T205-2000 "Construction. For water-crosslinked polyethylene pipes, the wall thickness deviation cannot exceed 14%.
Reporter: Is there a similar standard abroad?
Liu Hanliang: The PE-Xa pipe has a long history of application in European and American countries. Therefore, standards for PE Xa pipes in European and American countries are relatively perfect. The earliest international standard for PE-Xa pipes was the ISO10146 "Crosslinked Polyethylene PE X Pipes, Impact of Time and Temperature on Expected Strength" prepared in 1997. Nowadays, many PE Xa pipe manufacturers in the world have been following the ISO15875 “Crosslinked Polyethylene PE-X Pipe System for Cold and Hot Water†prepared in 2003. Many PE-Xa tube production and application countries have established their own national standards, such as the US ASTM F876 2005 "Standard Specification for Crosslinked Polyethylene PE-X Pipe Fittings" and ASTM F877-2007 "Crosslinked Polyethylene (PE-X)" Technical specifications for plastic hot and cold water distribution systems, German DIN 16892 2000 "Crosslinked Polyethylene PE-X Tubes - General Requirements and Tests". In the related accessories and system connection of PE-Xa pipes, the United States has separately formulated a series of standards, such as ASTM F1961a-2002 Standard Specification for Metal Mechanical Cold Flaring Pressure Pipe Fittings with Disc Springs for Cross-Linked Polyethylene PE-X Pipes. 》, ASTM F2080-2005 "Standard Specification for Cold-Expanded Pipe Fittings with Cross-Linked Polyethylene PE-X Tubing with Metal Compression Sleeves" and ASTM F2159 2005 SDR9 "Standard Specification for Plastic Insert Fittings Using Copper Extruded Rings for Cross-Linked Polyethylene PE-X Tubings" 》
Reporter: What standard does your company's PE Xa pipe refer to?
Liu Hanliang: The main material of the PE Xa tube of Hongyue Company is all XL1800 from South Korea's LG Chemical Co., Ltd., and the auxiliary material is the cross-linking agent of the Dutch “Akesu†company and the antioxidant of Germany’s “BASF†company. Hongyue's PE-Xa pipe implements the national standard of GB/T18992-2003, which is higher than the relevant requirements in the national standard in terms of factory inspection indicators. In addition, Hongyue also participates in the preparation of a number of national and industrial standards, such as Divided Water Collector for Hot and Cold Water and Technical Specification for Ground Radiant Heating.
Reporter: Please combine the history of your company's development of PE-Xa pipes. What processes and phases should be adopted for the new PE-Xa pipe products from the start of the project to production?
Liu Hanliang: Since its inception in 1994, Hongyue Company has been focusing on product development and technology promotion of plastic pipes, and has closely followed the technological developments in the field of floor heating pipes. In 2002 after a rigorous product demonstration and comprehensive market research and analysis of the system's supply and demand, Hongyue decisively decided to carry out the production of PE Xa pipe production project, and soon imported advanced production equipment from South Korea, in the professional and technical personnel Under the guidance of the rapid production.
Strict control of product quality is the key to the implementation of corporate production. To this end, Hongyue's Product Control Center has introduced high-precision testing equipment such as German IPT testing instruments, and conducted strict raw material inspections, online inspections, and factory inspections on the PE Xa tubes produced by Hongyue. Hongyue company's physical property testing room based on the sampling frequency of the product heat resistance, impact resistance, tensile, dimensional change rate, cross-linking degree, plasticity and many other features of the test, the static hydraulic chamber of a number of sets of hydraulic machine in the system The product was subjected to hydrostatic pressure tests at different temperatures. In the meantime, Hongyue company also passed the ISO9001 quality management system and ISO14001 environmental management system certification. Every production link in the production process has detailed written records to ensure the traceability of product quality.
In recent years, under the strong driving force of China's floor heating market, Hongyue's PE-Xa pipe often falls short of demand. For this reason, Hongyue Corporation has successively expanded PE Xa pipe production several times. Today, the production line of the PE Xa pipe of Hongyue Company has grown from 12 years ago to more than 60 now. At present, the production and sales volume of Hongyue Company's PE Xa pipe is among the best among the same companies in the country. The sales network has spread over most of the country, and some non-traditional heating areas in the south have also achieved breakthrough growth.
â– Dialogue Motivation The emergence of chemical tubing has made it possible for large-scale applications of floor heating systems. The floor heating industry has thus entered a new era. It is the PE Xa that directly promotes this revolutionary change in the heating industry. Moreover, up to now, PE-Xa tubes have always been one of the best quality and best-of-mouth floor heating pipes in many chemical pipes. Therefore, for the development of the floor heating industry, the PE-Xa pipe is in great success. Unfortunately, due to many reasons, the PE Xa tube, which has contributed greatly to the development of the floor heating industry, has never been able to go out of the shadow of being too low. In some parts of China, it has even become a synonym for low-end products. In order to provide readers with in-depth understanding of PE-Xa management, our reporter recently interviewed Han Hanliang, marketing manager of Hongyue Plastics Group Co., Ltd., a leading brand company in the Chinese floor heating industry from 2008 to 2009.
â– Dialogue Record Record Reporter: Can you briefly introduce PE-Xa?
Liu Hanliang: PE Xa pipe is the abbreviation of peroxide cross-linked polyethylene pipe. It uses high-density polyethylene as the main raw material, organic peroxide as the cross-linking agent, and extrusion using a plunger extruder. Forming pipe. Many domestic and foreign research institutes have found that the heat resistance of PE Xa pipes is good based on a number of data experiments. PE-Xa pipe through one-step chemical crosslinking in the process of processing, so that the polymer molecular chain formed covalent, and then form a uniform network structure, significantly improve the physical and chemical properties of ordinary PE X pipe. Due to the medium temperature of this pipe conveying up to 95 °C, up to 110 °C in a short time, it is very suitable for the transport of various high temperature fluids. Therefore, the PE-Xa tube is scientifically based as a heating tube in a low-temperature hot water surface radiant heating system.
The raw materials and auxiliary materials of PE-Xa pipes mainly include high-density polyethylene, cross-linking agents, antioxidants and auxiliary antioxidants. There have been four brands of PE-Xa pipe special materials on the Chinese market: XL1800 from South Korea's LG Chemical Company, 8100GX from Hunan Petrochemical Company, P110P/T12 from South Korea's Samsung General Chemicals Corporation, and P300X from South Korea's Korean Petrochemical Industry Company . At present, the raw material suppliers of domestic PE-Xa pipe enterprises are mainly Korean LG Chemical Company and Hunan Petrochemical Company. Domestic cross-linking agents and antioxidants used by domestic PE Xa pipe manufacturing enterprises are divided into imported and domestic products. Among them, imported auxiliary materials are mainly known from the “Aksu†in the Netherlands, BASF in Germany, and “Ciba†in Switzerland. The chemical company offers. Practice has proved that imported cross-linking agents and antioxidants are relatively stable in quality and performance is better than domestic similar products. Because of this, the primary antioxidants and auxiliary antioxidants used by domestic heating pipe manufacturers that attach importance to product quality are basically imported from the aforementioned chemical companies.
Reporter: What technical conditions should PE Xa pipe products have before entering the market?
Liu Hanliang: To ensure that PE Xa can be used in hot water for a long period of time. High-density polyethylene (HDPE) base materials should be added simultaneously with cross-linking agents, main antioxidants, and auxiliary antioxidants. The proportion of the process formulation is: HDPE 99%, peroxides and primary and secondary antioxidants 1%. The mechanism is: under the condition of high temperature and high pressure, peroxide crosslinking agent is used to make chemical linkage between the long molecular chains of high-density polyethylene to achieve chemical cross-linking and become a three-dimensional network structure. Because the polyethylene molecule is unsaturated, it will slowly change after ultraviolet radiation or oxygen attack until the molecular bond breaks. Therefore, the main antioxidant and the auxiliary antioxidant must be added to improve its resistance to photoaging and antioxidant aging.
In terms of production control, due to the long mold and high internal pressure of the PE-Xa pipe, the wall thickness of the PE-Xa pipe tends to fluctuate greatly in the extrusion process. Moreover, because the PE-Xa tube is a continuous production, it is not easy to monitor at any time. Therefore, how to ensure the uniformity of the tube wall thickness is one of the key points of the PE-Xa tube production process. Because the PE-Xa resin is in powder form, and the cross-linking agent is liquid, the amount of cross-linking agent and antioxidant is very small, so whether the raw and auxiliary materials can be fully mixed is the key to whether the cross-linking degree of the PE Xa tube is uniform or not. . In addition, since the cross-linking reaction of the PE-Xa tube is rapidly completed in a very short time in a die having a diameter of several tens of centimeters, the mold temperature control is also one of the key points of the process control of the PE-Xa tube.
In terms of product testing, the inspection items that PE Xa pipe must complete include routine inspections such as type size, longitudinal recoil rate, degree of cross-linking, short-term hydrostatic test, and 5000 cycles of thermal cycling and 8760 hours of thermal stability.
Reporter: Are there any criteria for reference in the above technical conditions?
Liu Hanliang: At present, the product standard of domestic PE Xa tube is mainly referenced by GB/T18992-2003 “Crosslinked Polyethylene PE-X Pipe System for Hot and Cold Water†(abbreviated as “GB/T18992-2003â€), which clearly stipulates PE-Xa pipe cross-linking degree should be greater than or equal to 70%, heat resistance, creep resistance and stress cracking resistance should meet the following requirements: 20 °C / 12M MPa ≥ 1 hour; 95 °C / 4.8 MPa ≥ 1 hour; 95°C/4.6 MPa ≥165 hours; 95°C/4.4 MPa ≥1000 hours; 110°C/2.5 MPa ≥8760 hours.
In terms of product appearance, GB/T 18992-2003 stipulates that the inner and outer surfaces of the pipe should be smooth, flat, and clean, and there must be no obvious scratches, dents, bubbles, etc. that may affect product performance; the pipe wall should have no visible impurities, and the pipe surface The color should be uniform and no significant color difference is allowed; the end face of the pipe should be cut flat and perpendicular to the axis of the pipe. GB/T 18992.2-2003 also stipulates that the PE-Xa pipe used for the building heating system must complete the 90°C/1000 hour hydrostatic test.
The temperature of hot water in China's low-temperature hot water surface radiant heating system is usually 40 °C ~ 60 °C, and the design pressure is generally 0.4M MPa ~ 6 MPa. Due to the different temperatures and pressures experienced by the pipes in different seasons, it is difficult to calculate the stress of PE Xa pipes under such conditions. In this regard, domestic pipe enterprises are basically based on the provisions of ISO10508:1995 "Thermoplastic Pipes and Fittings for Hot and Cold Water Systems" (abbreviated as "ISO10508:1995"), and four of them are selected according to the conditions of use.
PE Xa pipe should be inspected strictly according to the project required by GB/T18992.2-2003 standard. For the standard, there is no mention about the issue of wall thickness deviation rate. All manufacturers can refer to the construction industry standard CJ/T205-2000 "Construction. For water-crosslinked polyethylene pipes, the wall thickness deviation cannot exceed 14%.
Reporter: Is there a similar standard abroad?
Liu Hanliang: The PE-Xa pipe has a long history of application in European and American countries. Therefore, standards for PE Xa pipes in European and American countries are relatively perfect. The earliest international standard for PE-Xa pipes was the ISO10146 "Crosslinked Polyethylene PE X Pipes, Impact of Time and Temperature on Expected Strength" prepared in 1997. Nowadays, many PE Xa pipe manufacturers in the world have been following the ISO15875 “Crosslinked Polyethylene PE-X Pipe System for Cold and Hot Water†prepared in 2003. Many PE-Xa tube production and application countries have established their own national standards, such as the US ASTM F876 2005 "Standard Specification for Crosslinked Polyethylene PE-X Pipe Fittings" and ASTM F877-2007 "Crosslinked Polyethylene (PE-X)" Technical specifications for plastic hot and cold water distribution systems, German DIN 16892 2000 "Crosslinked Polyethylene PE-X Tubes - General Requirements and Tests". In the related accessories and system connection of PE-Xa pipes, the United States has separately formulated a series of standards, such as ASTM F1961a-2002 Standard Specification for Metal Mechanical Cold Flaring Pressure Pipe Fittings with Disc Springs for Cross-Linked Polyethylene PE-X Pipes. 》, ASTM F2080-2005 "Standard Specification for Cold-Expanded Pipe Fittings with Cross-Linked Polyethylene PE-X Tubing with Metal Compression Sleeves" and ASTM F2159 2005 SDR9 "Standard Specification for Plastic Insert Fittings Using Copper Extruded Rings for Cross-Linked Polyethylene PE-X Tubings" 》
Reporter: What standard does your company's PE Xa pipe refer to?
Liu Hanliang: The main material of the PE Xa tube of Hongyue Company is all XL1800 from South Korea's LG Chemical Co., Ltd., and the auxiliary material is the cross-linking agent of the Dutch “Akesu†company and the antioxidant of Germany’s “BASF†company. Hongyue's PE-Xa pipe implements the national standard of GB/T18992-2003, which is higher than the relevant requirements in the national standard in terms of factory inspection indicators. In addition, Hongyue also participates in the preparation of a number of national and industrial standards, such as Divided Water Collector for Hot and Cold Water and Technical Specification for Ground Radiant Heating.
Reporter: Please combine the history of your company's development of PE-Xa pipes. What processes and phases should be adopted for the new PE-Xa pipe products from the start of the project to production?
Liu Hanliang: Since its inception in 1994, Hongyue Company has been focusing on product development and technology promotion of plastic pipes, and has closely followed the technological developments in the field of floor heating pipes. In 2002 after a rigorous product demonstration and comprehensive market research and analysis of the system's supply and demand, Hongyue decisively decided to carry out the production of PE Xa pipe production project, and soon imported advanced production equipment from South Korea, in the professional and technical personnel Under the guidance of the rapid production.
Strict control of product quality is the key to the implementation of corporate production. To this end, Hongyue's Product Control Center has introduced high-precision testing equipment such as German IPT testing instruments, and conducted strict raw material inspections, online inspections, and factory inspections on the PE Xa tubes produced by Hongyue. Hongyue company's physical property testing room based on the sampling frequency of the product heat resistance, impact resistance, tensile, dimensional change rate, cross-linking degree, plasticity and many other features of the test, the static hydraulic chamber of a number of sets of hydraulic machine in the system The product was subjected to hydrostatic pressure tests at different temperatures. In the meantime, Hongyue company also passed the ISO9001 quality management system and ISO14001 environmental management system certification. Every production link in the production process has detailed written records to ensure the traceability of product quality.
In recent years, under the strong driving force of China's floor heating market, Hongyue's PE-Xa pipe often falls short of demand. For this reason, Hongyue Corporation has successively expanded PE Xa pipe production several times. Today, the production line of the PE Xa pipe of Hongyue Company has grown from 12 years ago to more than 60 now. At present, the production and sales volume of Hongyue Company's PE Xa pipe is among the best among the same companies in the country. The sales network has spread over most of the country, and some non-traditional heating areas in the south have also achieved breakthrough growth.
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