Foamable hot melt gasket sealants and use thereof
A technology of foaming heat, foaming agent, applied in the direction of bonding methods using foaming adhesives, sealing devices, adhesives in the form of films/sheets, etc.
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[0072] Various adhesive samples were prepared using the components shown in Table 1. Hot melt adhesives were prepared by mixing the polymer, stabilizer and plasticizer in a tank at 170-190°C using a paddle mixer until a homogeneous mixture was formed. Then, add tackifiers to the homogeneous mixture until the mixture becomes homogeneous, adding the tackifier with the highest softening point first and adding the tackifier with the lowest softening point last. The temperature of the mixture was lowered to about 165°C, 5% of the blowing agent citric acid was added and mixed until it became homogeneous.
[0073] The viscosity of the unfoamed material was obtained using the Steady Rate test, using an Ares-M rheometer. The sample is placed between two parallel plates (25 mm geometric diameter) with a 1 mm separation. in 1s -1 to 100s -1 Samples were tested at different shear rates. The recorded viscosity measurements in Table 1 are at 180 °C for 10 s -1 at the shear rate.
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