Preparation method and application of a 3D printing UV-cured transparent silicone resin composite material
A technology of 3D printing and composite materials, applied in the field of preparation of 3D printing UV-curable transparent silicone resin composite materials, can solve the problems of high hardness, high brittleness of parts, harsh printing conditions, etc., achieve low hardness, not easy to warp deformation, The effect of less water absorption
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Embodiment 1
[0031](1) Add a mixture of 300g of water, 5000g of toluene and 18.78g of concentrated sulfuric acid (98% mass concentration) into a 5L clean three-necked bottle, and then add 750g of γ-methacryloxypropyltrimethoxysilane, a mixture of 450 g dimethyldiethoxysilane and 68 g methyltriethoxysilane, continued to react for 4 hours after the dropwise addition, and then washed with water until medium properties, filter, remove the gel particles, and distill off the solvent and low boilers at 180°C under 20mmHg to obtain 720g of transparent liquid prepolymer with R / Si=1.40 and acryloxypropyl content of 0.35 (yield 68.0%) ), its viscosity is 370 cp.
[0032] (2) Take 1000g of fumed white carbon black, stir at 60°C, and add 10g of γ-methacryloxypropyltrimethoxysilane dropwise within 0.5h. After the dropwise addition, continue to stir for 12h .
[0033] (3) Take 500g of the prepolymer obtained in (1), take 5g of the modified fumed white carbon black in (2), add 0.5g of benzoin, 2g of ben...
Embodiment 2
[0037] (1) Add a mixture of 1500g of water, 450g of petroleum ether and 10.0 g of concentrated HCl (37% in mass concentration) to a 5L clean three-necked bottle, and then drop it with a dropping funnel at a temperature of 30°C. Add a mixture of 960 g γ-methacryloxypropyltrimethoxysilane, 420 g methylphenyldimethoxysilane and 75 g phenyltrimethoxysilane, continue the reaction for 24 hours after the addition is complete, and then Wash with water until neutral, filter, remove the gel particles, and distill off the solvent and low boilers at 180°C and 20mmHg to obtain 820 g of transparent liquid prepolymer with R / Si=1.5 and acryloyloxypropyl content of 0.28 (75.0% yield) with a viscosity of 190 cp.
[0038] (2) Take 1000g of fumed white carbon black, stir at 30°C, and add 150g of γ-methacryloxypropyltrimethoxysilane dropwise within 0.5h. After the dropwise addition, continue to stir for 24h.
[0039] (3) Take 500g of the prepolymer obtained in (1), take 50g of the modified gas-ph...
Embodiment 3
[0043] (1) Add a mixture of 6000g of water, 2400g of ethyl acetate and 154.0g of glacial acetic acid into a 10L clean three-necked bottle, and then add 900g of γ-methacryloyloxy Propyltriethoxysilane, a mixture of 600 g diphenyldimethoxysilane and 40 g methyltrimethoxysilane, continue to react for 0.5 h after the dropwise addition, then wash with water until neutral, filter to remove condensation Glue particles, and at 180 ° C, 20 mmHg, the solvent and low boilers were distilled off to obtain 580 g of transparent liquid prepolymer (yield 48.5%) with R / Si=1.60 and acryloyloxypropyl content of 0.25, with a viscosity of 90 cp .
[0044] (2) Take 1000g of fumed white carbon black, stir at 90°C, and add 50g of γ-methacryloxypropyl triethoxysilane dropwise within 0.5h. After the dropwise addition, continue to stir for 8h .
[0045] (3) Take 500g of the prepolymer obtained in (1), take 250g of modified fumed white carbon black in (2), add diphenylethanone, α,α-dimethoxy-α-phenylsty...
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