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The main purpose of polyurethane foam
Polyurethane foam is also called polyurethane elastomer material.
Polyurethane foam is an emerging organic polymer material, known as the "fifth largest plastic", and is widely used in many fields of the national economy because of its excellent performance.
Polyurethane elastomer, also known as polyurethane rubber, belongs to special synthetic rubber and contains more elastic polymers in the urethane range (-NHCOO-) in the molecular chain. There are many kinds of raw materials, various formulas, and a wide range of adjustment. The hardness is as low as Shore A10 low-modulus rubber, and as high as Shore D85 high-impact elastic material (the elastic modulus can be as high as several hundred MPa, while the elastic modulus of rubber is as low as 100 MPa. The amount is 0.2~10MPa), so the polyurethane elastomer is a polymer material ranging from rubber to plastic.
Foam is a high molecular polymer with many small cells, the solid phase is a polymer matrix, and the small cells are filled with gas.
Foam is divided into open-cell and closed-cell according to the structure of the cell.
Example diagram of the application of polyurethane foam in automobiles:
Summary of the main uses of foam:
•Panel interlayer: function - no pollution, prevent loosening, prevent impact noise, prevent sticking.
• Around the LED: prevent light leakage, absorb shock, and improve air tightness.
• PCB lower periphery: shock absorption, vibration absorption, gap filling, thermal insulation effect.
•Keyboard gasket: rebound, no pollution, good dimensional stability.
• Around the battery: no pollution, absorb shock sound, improve air tightness.
• Foot pad: good friction, no pollution, good dimensional stability.
• Disk drive rear pad: absorb shock, prevent impact noise, improve air tightness.
• Friction pad: good friction, no pollution, good dimensional stability.
• Disc cover cushion: absorb shock, block motor noise, shockproof, improve air tightness.
• Around the speaker: prevent noise and fill gaps.
• Around the LCD: dustproof, shock absorption, gap filling, and light-shielding improvement.
