Photocurable compositions having variable viscosities
A composition, light-curing technology, used in the manufacture of tools, stamping cups, dental prostheses, etc., can solve problems such as damage to the mechanical strength of cured polymers
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Embodiment 1
[0159] Preparation and Measurement of Example Composition 1
[0160] All components listed in Table 2 were weighed into a flask and stirred in the dark for 8 hours to 24 hours until all solid contents were dissolved and homogeneous. The viscosity measured at 25°C was about 32 mPa.s.
[0161]In order to evaluate its printability and mechanical strength, a DLP projector with a resolution of 1024×768 (brand and model : Acer P128) as the light source, and use Creation Workshop as the control software] to print dog-shaped stretching rods. Printing was performed with a sheet thickness of 50 μm. The exposure time for each layer is 5800ms. After printing, the print sticks were thoroughly cleaned with isopropanol, air dried and placed in a UV oven for further curing.
[0162] Compressive strength was measured on an Instron 4500 test system by upgrading the control system with Instron's advanced 5500 electronics and software.
[0163] Table 2. Example Composition 1
[0164] ...
Embodiment 2
[0166] Preparation and Measurement of Example Composition 2
[0167] All components listed in Table 3 were weighed into a flask and stirred in the dark for 8 hours to 24 hours until all solid contents were dissolved and homogeneous. The viscosity measured at 25°C was about 42 mPa.s.
[0168] In order to evaluate its printability and mechanical strength, a DLP projector with a resolution of 1024×768 (brand and model : Acer P128) as the light source and use Creation Workshop as the control software] to print dog-shaped stretching rods. Printing was performed with a sheet thickness of 50 μm. The exposure time for each layer is 5800ms. After printing, the print sticks were thoroughly cleaned with isopropanol, air dried and placed in a UV oven for further curing.
[0169] Table 3. Example Composition 2
[0170] components Percentage (weight%) bisphenol A dimethacrylate 35 polyethylene glycol diacrylate 60 Tetrahydrofuryl methacrylate 4 Phenyl...
Embodiment 3
[0172] Preparation and Measurement of Example Composition 3
[0173] All components listed in Table 4 were weighed into a flask and stirred in the dark for 8 hours to 24 hours until all solid contents were dissolved and homogeneous. The viscosity measured at 25°C was about 47 mPa.s.
[0174] In order to evaluate its printability and mechanical strength, a DLP projector with a resolution of 1024×768 (brand and model : Acer P128) as the light source, and use Creation Workshop as the control software] to print dog-shaped stretching rods. Printing was performed with a sheet thickness of 50 μm. The exposure time for each layer is 5800ms. After printing, the print sticks were thoroughly cleaned with isopropanol, air dried and placed in a UV oven for further curing.
[0175] Table 4. Example Composition 3
[0176] components Percentage (weight%) Bisphenol A diglycidyl ether methacrylate 50 polyethylene glycol diacrylate 46 Methacryl POSS cage mixture...
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