Polyurethane direct buried insulation pipe is a kind of direct buried prefabricated insulation pipe with good insulation performance, safety and reliability, and low engineering cost. Directly buried insulation pipe not only has advanced technology and practical performance that traditional trenches and overhead laying pipelines are incomparable, but also has significant social and economic benefits. It is also a powerful measure for heating and energy saving. The prefabricated direct buried insulation pipe adopts direct buried heating pipeline technology, which indicates that the development of China's heating pipeline technology has entered a new starting point. With the declining world energy and increasing demand, energy conservation, emission reduction, and environmental protection have become global development trends. National and local governments have also vigorously advocated the development, application, and industrialization of energy conservation, emission reduction, and environmental protection products.

Polyurethane rigid foam insulation materials for the construction industry is an important branch of the polyurethane industry, which is characterized by multi-purpose material, and has the functions of thermal insulation and waterproof. This kind of product has been used for 40 years in the European construction industry since the 1960s, and some countries have passed legislation to use polyurethane as the heat insulation and waterproof material designated by the construction industry. In recent years, with the rapid development of China's building energy saving market, polyurethane rigid foam insulation products have been widely used in the field of building insulation and waterproofing, and have become one of the leading insulation and energy saving products in the market.

As a building insulation and waterproof integrated material, the rigid polyurethane foam breaks the traditional building materials with a single function-waterproof insulation, non-waterproof insulation. Once the waterproof layer leaks, the insulation layer loses the insulation function. Compared with other single-function insulation or waterproof materials, polyurethane rigid foam has obvious advantages:

1. Polyurethane rigid foam has a multi-purpose function, and also has many functions such as heat preservation, waterproof, sound insulation, vibration absorption and so on.

2. Excellent thermal insulation performance. It is the thermal insulation material with the lowest thermal conductivity (≤0.024) and the highest thermal resistance value among all domestic building materials. The thermal conductivity is only half of EPS foamed polystyrene board.

3. The continuous dense skin of polyurethane rigid foam body and nearly 100% high-strength interconnected wall closed cells have ideal water-impermeability. The spraying method is used to achieve continuous and seamless joints of the waterproof insulation layer, forming a seamless roof and an integral outer wall insulation shell, with excellent waterproof and impermeability performance.

4. Super self-adhesive performance (no intermediate bonding material is required), strong adhesion to roof and external wall, good resistance to wind and negative wind pressure; overall spray construction completely eliminates "hot spots" and "cold bridges" ; Flexible gradient technology can effectively prevent the cracking of the waterproof layer; mechanized operation, automatic batching, uniform quality, fast construction and short cycle.

5. Stable chemical properties, long service life, no pollution to the surrounding environment; self-extinguishing from open flame, and only charring without dripping when burning, the size and shape of the charring layer are basically unchanged, which can effectively block the entry of air and prevent fire. Spread, good fire safety performance.

As the only new thermal insulation and waterproof integrated building material, the application of polyurethane rigid foam insulation materials in the domestic construction industry is still in the initial stage. Fortunately, in order to accelerate the innovation of building insulation materials and promote the promotion and application of polyurethane rigid foam in the field of building energy conservation, the Ministry of Construction specially established the "Polyurethane Energy Saving Application Working Group" to promote the energy conservation of polyurethane rigid foam insulation and waterproof materials in domestic buildings Industry applications.

Polyurethane insulation tube has excellent characteristics such as light weight, high strength, heat insulation, sound insulation, flame retardant, cold resistance, anticorrosion, non-absorbent water, simple and fast construction, etc. Waterproof plugging, sealing and other indispensable materials. (Buy steel pipe, Lai Chengyuan) 1. Small thermal conductivity:

The thermal conductivity of polyurethane foam is the lowest among the insulation materials, so it can reduce the heat loss of the material to the minimum.