High-resilience polyurethane foam is a kind of foam material with light weight, softness, high resilience, and excellent shock absorption and buffering properties. It is currently widely used in vehicles such as automobiles, high-speed rails, and airplanes.

At present, lightweight, safety, environmental protection, and comfort have become the new trends in the development of polyurethane foam technology for automotive seats. In addition to factors such as suspension system and vehicle tuning, driving comfort is also closely related to the performance of seat foam.

The performance of seat foam is mainly divided into two categories: static and dynamic comfort. Static performance includes rebound rate, tensile strength, compression set rate, indentation hardness, etc., while dynamic performance includes hysteresis loss rate, resonance frequency and conductivity. Wait.

The hysteresis loss rate can reflect the comfort and fatigue resistance of seat foam, and has now become one of the key performance indicators of high-quality seat products.

Relevant studies have shown that with the increase of the relative molecular weight of polyether, the resilience of the foam increases, and the hysteresis loss rate decreases significantly. The lower the hysteresis loss rate of the foam, the lower the corresponding compression set rate and resonance frequency, which can effectively buffer the vibration that causes discomfort to the human body during the driving of the car.

Polyurethane high-resilience molded products generally use high-activity polyether triol and isocyanate to react to form a polymer substance with a spatial network structure, but conventional high-activity polyether is affected by catalysts in the production process, and the degree of unsaturation is higher High, the actual functionality is lower, so the resulting spatial network is unstable, making the foam article prone to collapse after prolonged use. At present, the relative molecular weight of commercial high-activity polyether triols is generally within 6000, mainly because when the molecular weight is further increased, the by-products of the polyether reaction prepared by the catalyst KOH increase rapidly, and the degree of unsaturation also increases, resulting in foaming. Product performance declines.

Changhua Chemical has developed a high-activity polyether CHE-822P, which uses an organic alkoxide catalyst developed by itself. It has good compatibility with polyether products, high catalytic activity, and the prepared high-activity polyether products have a narrow molecular weight distribution. , low unsaturation, polyurethane foam products made of this type of polyether have excellent mechanical properties, stability and durability. CHE-822P has extremely low degree of unsaturation and high molecular weight, which makes the foam products have extremely low compression set (especially after moist heat aging), and the service life is improved, the resilience and hysteresis loss performance are improved, and the comfort is improved. On the premise that the performance of the foam product remains unchanged, the density of the product can be reduced by 5-10%, so as to achieve the purpose of light weight.

By thinning the seat, the interior space can be further improved, but after the seat foam is thinned, it is easy to cause the resonance frequency to move to high frequencies, and the transmittance above 5Hz will increase significantly, causing passengers to feel uncomfortable.