A kind of elastic material for 3D printing and its preparation method, printing method and device
A 3D printing, elastic material technology, applied in the field of 3D printing, can solve the problems of sticky surface, low strength of elastic 3D objects, poor tear resistance, etc.
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Embodiment 1
[0122] The composition of the elastic material for 3D printing in this embodiment is shown in Table 1.
[0123] Table 1
[0124]
[0125] The preparation method of the elastic material for 3D printing in this embodiment includes: placing the reaction kettle in a yellow light environment, adding self-blocking isocyanate, photocurable monofunctional monomer, and photocurable crosslinking agent to the reaction kettle according to the formula ratio In the middle, heat up to 40-50°C, stir for 30-40 minutes until mixed uniformly to obtain the first mixture; then add photoinitiator and auxiliary agent according to the formula ratio, stir for more than 60 minutes until mixed uniformly to obtain the second mixture, cool down to 20- 30°C, adopt the method of two-stage filtration, the first-stage filtration adopts glass fiber membrane with a pore size of 0.45 μm, and the second-stage filter adopts a polypropylene membrane with a pore size of 0.22 μm, and then degasses at normal pressu...
Embodiment 2
[0135] The composition of the elastic material for 3D printing in this embodiment is shown in Table 2.
[0136] Table 2
[0137]
[0138]
[0139] The preparation method of the elastic material for 3D printing in this example is basically the same as the method in Example 1, the only difference is that after the second stage of filtration, degassing under reduced pressure is used for 1.5 hours.
[0140] The preparation method of self-blocking type isocyanate B in the present embodiment comprises the following steps:
[0141] Weigh 264.17g of monofunctional photocurable monomer (isobornyl acrylate) that does not contain active hydrogen in the molecular structure, 200g of polyester diol (2000 molecular weight), 18.90g of 1,6-hexanediol, 0.03g of diol Put dibutyltin laurate in the reaction vessel and stir evenly; then add 45.24g of TDI dimer, slowly raise the temperature to 60°C and keep it for 4h; measure the NCO value to be close to zero, and after cooling down to room t...
Embodiment 3
[0148] The composition of the elastic material for 3D printing in this embodiment is shown in Table 3.
[0149] table 3
[0150]
[0151]
[0152] The preparation method of the elastic material for 3D printing in this embodiment is the same as that in Embodiment 1.
[0153] The preparation method of self-blocking type isocyanate C in the present embodiment comprises the following steps:
[0154] Weigh 65.24g of monofunctional photocurable monomer (tetrahydrofuran acrylate) that does not contain active hydrogen in the molecular structure, 200g of polycarbonate diol (2000 molecular weight), 14.41g of 1,4-butanediol, 1.3g of diol Put dibutyltin laurate in the reaction vessel, stir evenly; then add 45.24g TDI dimer, slowly raise the temperature to 60°C and keep it for 2h; measure the NCO value to be close to zero, and after cooling down to room temperature, the self- Blocked isocyanate C, wherein the content of self-blocked isocyanate C is 80%.
[0155]
[0156] Self-b...
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