A hybrid structure fully biodegradable composite sound insulation material and its preparation method
A sound insulation material, biodegradable technology, applied in coating, filament/wire forming, fiber processing, etc., to achieve the effect of small fiber diameter, maximum attenuation, and high porosity
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Embodiment 1
[0027] In this embodiment, the biodegradable fiber with micron structure is polyester fiber. The polyester fiber is opened and carded to form a single fiber state, and then stacked to form a uniaxially oriented network layer with a surface density of 30g / m 2 , the thickness is 3mm. The cross section of the polyester fiber is circular, has a cavity structure, and the fiber diameter is 12 μm.
[0028] The nanofiber layer can be formed by needle electrospinning, and polylactic acid is used as the raw material for forming nanofibers. Polylactic acid (PLA, M w =3×10 5 g / mol) after vacuum-drying (60°C, 12h), using chloroform as a solvent to prepare a 20% solution, magnetically stirring for 4h, and standing for defoaming for 2h. The prepared PLA solution was electrospun by the needle method, the receiving end was a polyester fiber mesh layer, the spinning voltage was 15kV, the receiving distance was about 12cm, and the advancing speed was 0.5ml / h, and the nanofiber layer was obta...
Embodiment 2
[0030] In this embodiment, the biodegradable fiber with micron structure is bio-based polyamide fiber. The bio-based polyamide fiber is opened and carded to form a single fiber state, and then stacked to form a uniaxially oriented network layer with an area density of 30g / m 2 , the thickness is 3mm. The cross-section of the bio-based polyamide fiber is non-circular, has two cavity structures, and the fiber diameter is 10 μm.
[0031] The nanofiber layer can be formed by electrospinning with a shuttle electrode method, and polycaprolactone is used as a raw material for forming nanofibers. Polycaprolactone (PCL, M w =8×10 4 g / mol) after vacuum drying (60° C., 12 h), using chloroform: DMF (4:1) as a mixed solvent to prepare a 15% solution, magnetic stirring for 4 h, and standing for defoaming for 2 h. The prepared PCL solution was electrospun by the shuttle electrode method. The receiving end was a bio-based polyamide fiber mesh layer. The spinning voltage was 55kV, the recei...
Embodiment 3
[0033] In this embodiment, the biodegradable fiber with micron structure is polycaprolactone fiber. The polycaprolactone fiber is opened and carded to form a single fiber state, and then stacked to form a uniaxially oriented network layer with a surface density of 30g / m 2 , the thickness is 3mm. The cross-section of the polycaprolactone fiber is non-circular, without cavity structure, and the fiber diameter is 15 μm.
[0034] The nanofiber layer can be formed by needle electrospinning, and polylactic acid is used as the raw material for forming nanofibers. Polylactic acid (PLA, M w =3×10 5g / mol) after vacuum-drying (60°C, 12h), using chloroform as a solvent to prepare a 15% solution, magnetically stirring for 4h, and standing for defoaming for 2h. The prepared PC solution is subjected to centrifugal electrospinning, the receiving end is a polycaprolactone network layer, the spinning voltage is 10kV, the receiving distance is about 10cm, and the rotation speed is 1000r / min,...
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