Breathable thermal insulation material - Water-based PU foam
Water-based flexible foaming material, is the abbreviation of all-water-based flexible foamed polyurethane foam, is a 100% water-based on-site flexible foaming thermal insulation and thermal insulation material, is a flexible open-cell polyurethane foam made by the reaction of all-water-based foamed polyurethane special resin and isocyanate (MDI), which is a yellowish milky white foam-like solid, odorless, lightweight, soft, open-cell material. With the unique structure and construction technology of its thermal insulation system, it can provide excellent thermal insulation, gas blocking, moisture-proof and water-repellent effects, and at the same time, the open cell structure and hydrophobicity of the product itself have the function of moisture discharge and self-drying, and are known as "breathing thermal insulation materials" by the industry, and its green environmental protection, durability and other characteristics make it widely used in the world, such as the United States, Canada, Europe, Japan, South Korea and China, mainly used in construction, automotive and other fields.
Water-based foaming materials play an important role in improving the performance of the whole vehicle such as heat preservation, vibration reduction, environmental protection, sealing, anti-corrosion, and fuel saving, and will have epoch-making significance for the improvement of the technical level of the entire Chinese bus industry.
Comparison of water-based foaming materials with ordinary polyurethane foams:
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Comparison items |
All-water-based, flexible-foamed polyurethane foam |
Ordinary polyurethane foam |
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1. Environmental performance |
The new flexible water-based foaming material, 100% water-based foaming agent, does not contain fluoride, inert gas and other substances harmful to the atmospheric environment and human health.The total carbon content is 372.6ugC/g. |
Ordinary polyurethane contains polyether polyol and other substances, and is not easy to volatile, and has great continuous damage to the human body. The total carbon content is more than 500.0ugC/g |
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2. Constructability
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The construction is simple and fast, the base layer does not need special treatment, it can be carried out in high and low temperature and humid environments, and the thermal insulation performance of foam will not be reduced; The use of special imported equipment for proportioning, heating, mixing and spraying, the construction is less affected by human factors. |
During the construction process, the surface should be treated with interface to ensure that the rigid foam polyurethane spraying insulation layer is tightly combined with the substrate; Traditional equipment is used in the construction process, and the ratio and mixing are greatly affected by human factors, and the construction quality is unstable |
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3. Material characteristics
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The foaming speed is fast, the foaming amount is large, the foaming is uniform, the one-time molding, the surface flatness is high, it has the ability of elastic deformation, and can be elastically deformed with the thermal expansion and contraction deformation of the peripheral structure of the vehicle; The filling performance is good, the shape is different, the corners and gaps can be well covered, and it has good operability for the interlayer of steel plate in the car body: at the same time, it has strong adhesion and will not break off. |
The foaming coefficient is low, the starting speed is slow, and the foaming cycle is long; The sagging phenomenon is serious, and the surface flatness is not high, which is easy to cause the body to expand and dent, affecting the flatness of the body; The adhesion is not strong, and there are phenomena such as fracture and falling off. |
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4. Breathable and moisture discharge |
The unique open-cell structure, the formed thermal insulation layer has "breathability", will not collapse after encountering water, set thermal insulation, gas blocking, moisture-proof and water seepage four functions in one, after drying the thermal insulation performance will not be lost, can effectively prevent moisture penetration, and the open-cell structure can make the moisture in the foam dry naturally under the action of gravity. |
The completely closed-cell structure does not have the ability to drain moisture and dry itself. When the temperature difference between the inside and outside of the car is large, the interlayer may condense due to the barrier of rigid foam polyurethane when the water vapor migrates, which is easy to breed mold and rot, affecting the environment in the car and causing corrosion of the body |
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5. Service life |
The service life is long, the thermal insulation performance can not be reduced during the whole service life, the surface does not change color, does not age, and does not need to be treated for surface load anti-aging. |
In the short term, it becomes yellow and old after brittleness, the flatness of the surface of the material is greatly affected by the flatness of the matrix, and it is easy to age under the action of light, heat and atmosphere, and it is easy to hydrolyze when exposed to water, heat and alkali. |
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6. Own weight |
The density of the finished product is only 8 kg/m3, which is far lower than the requirement of 30kg/m3, the performance index of the thermal insulation material of the passenger car. |
Density 20-30kg/m3 |
Because the water-based flexible foam is a 100% water-based material, the odor is non-toxic, which can effectively improve the operator's construction environment and the air quality in the car, and is really green and environmentally friendly.
Under the tide of the world's low-carbon economy, the concept of green transportation is being widely recognized and promoted in the transportation industry, and energy-saving and environmentally friendly buses have ushered in important strategic opportunities. In short, the promotion of water-based foam materials will lay a good foundation for the overall performance of buses, and have a positive impact on improving the overall level of China's buses and the competitiveness of the world's bus industry.
In recent years, Qichen has been committed to the research and development of water-based polyurethane foam raw mateials suitable for buses, welcome everyone to consult and communicate, contribute to the world's bus industry together.
