Preparation method of bio-based rigid foam material with negative Poisson's ratio and product
A foam material and negative Poisson's ratio technology, which is applied in the field of preparation of negative Poisson's ratio bio-based rigid foam materials, can solve the problems of complicated process and unfavorable industrialization, and achieve low equipment requirements, low cost, and narrow pore size distribution effect
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Embodiment 1
[0027] Preparation of Negative Poisson's Ratio Bio-based Rigid Foam
[0028] (1) Place polybutylene succinate in a cylindrical autoclave, close the autoclave and feed carbon dioxide until the air in the autoclave is exhausted, continue to feed carbon dioxide to high pressure After the pressure in the autoclave is 8MPa, stop feeding carbon dioxide, heat up to 120°C and keep for 2h, then cool down to 96°C and keep for 10min, then reduce the pressure in the autoclave to atmospheric pressure within 3s, take out the product and cool to room temperature, Produce bio-based rigid foams;
[0029] (2) Heat the bio-based rigid foam material prepared in step (1) to 102°C, keep it for 0.5h, and then compress it from the axial and circumferential directions of the bio-based rigid foam material, wherein the axial direction The compressibility is 30%, the circumferential compressibility is 17%, and the bio-based rigid foam material with a Poisson's ratio of -0.2 is obtained.
Embodiment 2
[0031] Preparation of Negative Poisson's Ratio Bio-based Rigid Foam
[0032] (1) Place the polylactic acid in a cylindrical autoclave, close the autoclave and feed carbon dioxide until the air in the autoclave is exhausted, continue to feed carbon dioxide until the pressure in the autoclave is 9MPa Then stop feeding carbon dioxide, heat up to 170°C and keep for 3 hours, then cool down to 155°C and keep for 12 minutes, then reduce the pressure in the autoclave to atmospheric pressure within 3 seconds, take out the product and cool it to room temperature to obtain a bio-based hard foam material;
[0033] (2) Heat the bio-based rigid foam material prepared in step (1) to 55°C, keep it for 0.5h, and then compress it from the axial and circumferential directions of the bio-based rigid foam material, wherein the axial direction The compression ratio is 10%, and the compression ratio in the circumferential direction is 30%, and a bio-based rigid foam material with a Poisson's ratio ...
Embodiment 3
[0035] Preparation of Negative Poisson's Ratio Bio-based Rigid Foam
[0036](1) Place the polyhydroxyalkanoate in a cylindrical autoclave, close the autoclave and feed carbon dioxide into the autoclave until the air in the autoclave is exhausted, and continue to feed carbon dioxide into the autoclave After the pressure reaches 8.5MPa, stop feeding carbon dioxide, heat up to 180°C and keep for 2.5h, then cool down to 168°C and keep for 15min, then reduce the pressure in the autoclave to atmospheric pressure within 3s, take out the product and cool it to room temperature, and prepare Obtain bio-based rigid foam materials;
[0037] (2) Heat the bio-based rigid foam material prepared in step (1) to 110°C, keep it for 1 hour and compress it from the axial and circumferential directions of the bio-based rigid foam material, wherein the axial compression The ratio is 20%, the circumferential compressibility is 10%, and a bio-based rigid foam material with a Poisson's ratio of -0.12 ...
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