Multi-layer composite energy absorption material and preparation thereof
An energy-absorbing material, multi-layer composite technology, applied in the field of materials, can solve problems such as large differences in application fields, and achieve the effects of improving protection efficiency, easy construction, and good flame retardant performance
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Embodiment 1
[0038] Example 1: Analysis of damping performance of viscoelastic damping material
[0039] In order to test the damping performance of the viscoelastic damping material used in this application, the DMA-Q800 dynamic mechanical analyzer produced by the American TA company was used to test its dynamic mechanical properties, and the loss modulus of the material ( image 3 ), storage modulus ( Figure 4 ) and loss factor curves ( Figure 6 )
[0040] Depend on image 3 It can be seen that when the frequency is constant, the loss modulus and storage modulus of the viscoelastic damping material show different laws in three different temperature ranges. -80~-40°C is in glassy state, the molecular chain segment is in a frozen state, the loss modulus is smaller than the storage modulus, but it increases slowly with the increase of temperature, the storage modulus of the material is higher and with the increase of temperature High and low; this stage corresponds to the high strain ...
Embodiment 2
[0044] Embodiment 2: Performance analysis of high-strength polyurea elastomer
[0045] (1) Strain rate sensitivity analysis of high-strength polyurea elastomer
[0046] In order to verify that the polyurea elastomer has high strain rate sensitivity, the mechanical properties of the polyurea coating were tested by a universal mechanical testing machine, and the stress-strain curve of the material was obtained as follows: Figure 7 shown.
[0047] From the stress-strain curve of the material, it can be seen that under the action of low strain rate, the strength of polyurea changes significantly at strain rates of different orders of magnitude; as the strain rate increases, its elastic phase gradually becomes longer, and the elastic modulus also increases. A certain change occurs, and the second strain also decreases. However, due to the high elongation at break of polyurea elastomer, its deformation still meets the actual needs. It can be seen from the WLF equation that under...
Embodiment 3
[0052] According to ASTM D4541-09 pull-out method, PosiTest AT-A hydraulic adhesion tester is used to test the adhesion of viscoelastic damping materials. The test sample is sampled at the pouring site, and the adhesion test is carried out after 3 days of curing at room temperature. After the curing of the coating, use Ergo1690 acrylic structural adhesive to paste the pull-off ingots with a diameter of 20mm, and paste four pull-off ingots evenly on the surface of the steel plate, with a distance of 5cm between the pull-off ingots, and cure at room temperature for 24 hours. After curing, use a cutting knife to cut and pull the coating around the ingot, and use a PosiTest AT-A hydraulic adhesion tester to test the coating adhesion. The above experiment was repeated three times, and the arithmetic mean value was the adhesion between the viscoelastic damping material and the steel plate.
[0053] Such as Figure 9 As shown, through the adhesion test of the viscoelastic damping m...
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Abstract
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