3D Printing White Photosensitive Resin

The photosensitive resin material is a special 3D printing material for SLA rapid prototyping, SLA three-dimensional printing 3D printing molding, also known as liquid photosensitive resin selective curing, usually abbreviated as light curing molding. SLA technology is based on the light curing principle of liquid photosensitive resin. This resin material can quickly undergo cross-linking reaction under the irradiation of a certain wavelength and intensity of ultraviolet light (laser wavelength is in the ultraviolet band, enter 325nm) to produce a cured product.

The materials for photosensitive resin SLA are generally liquid photosensitive resin, such as photosensitive epoxy resin, photosensitive vinyl ether, photosensitive epoxy acrylate, photosensitive acrylic resin and so on. The photosensitive resin is composed of two parts, namely photoinitiator and resin (resin is composed of prepolymer, diluent and a small amount of additives). When the photoinitiator is irradiated by ultraviolet light of a certain wavelength (3oonm-4oonm), it absorbs light energy, changes from the ground state to the excited state, and then generates active free radicals, which initiates the polymerization and curing reaction of the prepolymer and the active monomer; diluent It is mainly used for diluting to ensure that the photosensitive resin has sufficient fluidity at room temperature so that it can flow evenly before making the next layer.

The amount of photoinitiator and diluent has an important influence on the curing speed and curing quality of the photosensitive resin. Within a certain range, increasing the amount of photoinitiator can appropriately speed up the curing speed, but if it exceeds a certain range, continue to increase, and the curing speed will not increase, but decrease; the amount of diluent has a greater impact on the leveling speed of the liquid. If it is too large, the viscosity of the liquid will decrease and the leveling will be good. However, when the amount is too large, the linear molecular chains will be spaced too far apart, and the chance of cross-linking when they meet each other will decrease, which will inevitably affect the curing speed and quality. The proportion of photoinitiator and diluent is appropriate, not only the curing speed is fast, but the curing quality is also better.

The selection of photosensitive resin materials requires the following performance characteristics: rapid curing under the irradiation of a certain frequency of monochromatic light, with a small critical exposure and a large curing penetration depth; the curing shrinkage is small, and the curing shrinkage causes the parts to deform and warp. Curving, cracking, etc., which affect the accuracy of molded parts. Low shrinkage resin is conducive to molding high-precision parts; low viscosity, low viscosity during molding is conducive to resin leveling on the cured layer; low swelling, wet molded parts The swelling in the liquid resin causes the part size to be too large; the rapid prototyping part must have sufficient strength and good surface finish, and be less toxic during molding and so on. Of course, after molding and cleaning, it is non-toxic and pollution-free, so don’t worry about using it.

3D Printing Technical Parameters

• 1. One-time forming printing size: usually 600x600x400mm; maximum one-time forming 1600X800X600mm without splicing
• 2. Printing layer thickness: 0.05mm~0.25mm;
• 3. Achievable accuracy: molding accuracy: ±0.1mm (L≤100mm) or ±0.1%×L (L>100mm)
• 4. Post-processing: easy polishing, spraying, electroplating, drilling, large size objects can be spliced;

Features Of Photosensitive Resin Material

It is a photosensitive resin material similar to ABS, with an opaque white appearance and durability. These printed parts can be polished, painted, sprayed, electroplated, and are very close to ABS engineering plastics.