Heat-resisting polyethylene plastic pipe with high heat conductivity

Abstract

The invention discloses a heat-resisting polyethylene plastic pipe with high heat conductivity, which is characterized by being prepared from heat-resisting polyethylene resin with excellent corrosion resistance and heat resistance, a heat conducting material with high heat conductivity, and other auxiliaries through extrusion molding after the steps of melting and blending for modification. The heat-resisting polyethylene plastic pipe with high heat conductivity can be of single component and single layer, can also be of multiple components and multiple layers, and has the heat conduction coefficient more than two times higher than basic resin-heat resisting polyethylene; and when being used for conveying water as a medium, the heat-resisting polyethylene plastic pipe has the designed lifetime up to 50 years after continuously working at 70 DEG C, can work at the temperature up to 90 DEG C in a short period of six years and can work at the temperature up to 110 DEG C in a short period of one year. The heat-resisting polyethylene plastic pipe can be directly applied to a soil source heat pump, a seawater source heat pump system, a sewage source heat pump system and a radiation cooling and heating system to be used as a heat exchange pipe, is beneficial to improvement of system heat-transfer capability, can be welded and processed into heat exchangers with different forms and structures, and is used for chemical, food and medicine manufacturing processes with higher-temperature media.

Description

technical field [0001] The invention relates to a polyethylene plastic pipe excellent in corrosion resistance, thermal conductivity and heat resistance for heat exchangers. Background technique [0002] Most plastics have excellent corrosion resistance and are widely used in many fields, such as many plastic containers and plastic pipes used in chemical processes. Plastic has become an irreplaceable main material. In the industrial field, although the traditional metal materials have good mechanical properties, heat resistance and heat transfer performance, they bring great difficulties to the application because of their poor corrosion resistance, short service life, and pollution of the treated medium; especially It is the sewage source heat pump, seawater source heat pump and soil source heat pump that have developed rapidly in recent years. The demand for heat exchangers is very large, and the design service life requires more than ten to several decades. Advantage. Po...

AI Technical Summary

Problems solved by technology

[0004] However, these plastic pipes still have many shortcomings, such as ordinary polyethylene pipes and heat-conducting polyethylene pipes, which have a common congenital deficiency, that is, they have poor heat resistance, and the continuous working temperature generally does not exceed 40°C.

If the working temperature exceeds 40°C, its pressure bearing capacity and service life will drop sharply

In addition, the thermal conductivity of ordinary high-density polyethylene pipes is only about 0.4w / m.k, and the heat transfer efficiency is low

It is calculated that if the thermal conductivity of the polyethylene pipe is increased to 1.00w / m.k, in the vertically buried ground source heat pump system, the heat transfer capacity of the heat-conducting polyethylene pipe is longer than that of the ordinary polyethylene pipe in winter. The improvement rate is greater than 15% under heating and summer cooling conditions; the heat-conducting polypropylene tube has good heat resistance, but has a high elastic modulus, poor flexibility, and poor impact toughness, which greatly limits its application. The heat pump system is more difficult; the heat-conducting polybutylene pipe has good heat resistance, but is sensitive to gaps, has poor scratch resistance, high oxygen permeability and price, and its development is very difficult; the comprehensive performance of the heat-conducting cross-linked polyethylene pipe Very good, but its hot-melt weldability is extremely poor. PE-Xc pipes cannot be welded. Although PE-Xa pipes and PE-Xb pipes can be welded, their long-term performance is unknown, so their applications are also greatly restricted.

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