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Introduction of Rigid Polyurethane AB Closed Cell Spray Foam
Shandong Hightop Machinery Co., Ltd is the leader in polyurethane technology . Our company is mainly in engaged in Spray Foam Machine, Polyurethane Foaming Machine, Spray Foam Equipment, Spray Foam Insulation Machine also have Airless Spray Equipment,Small Excavator , Road Construction Machinery , Packing Machine , Snack Machine .,Chemical Material, Air Polisher
Polyurethane (PUR and PU) is a polymer composed of organic units joined by carbamate (urethane) links. While most polyurethanes are thermosetting polymers that do not melt when heated, thermoplastic polyurethanes are also available.
Polyurethane polymers are traditionally and most commonly formed by reacting a di- or poly-isocyanate with a polyol. Both the isocyanates and polyols used to make polyurethanes contain, on average, two or more functional groups per molecule.
Parameter of Polyurethane Spray Material
Appearance Pale yellow to brown viscous liquid
Hydroxyl Value mgKOH/g 310-380
Dynamic Viscosity (25 ℃) mpa.s 100-200
Specific gravity (20 ℃ ) g/ml 1.12-1.20
Storage Temperature ℃ 10-25
Storage Stability month 6
Recommended Ratio
pbw
DQT-501A blend polyols 100
Reactivity Characteristics
(The temperature of the system is 20℃,and the exact value varied depending on processing condition)
Cream Time S 3-5
Gel Time S 6-10
Free rise density kg/m3 20-23
Foam Performances
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items Test Method Index |
Closed-cell Rate ≥90%
Initial Thermal Conductivity(15℃) ≤24mW/(m.K)
Compressive Strength ≥100kPa
Adhesive Strength ≥100kPa
Elongation at break ≥100kPa
Dimentional Stability 24h 70℃ ≤2%
Water Absorption ≤3%
Oxygen Index B2