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What is the most commonly used material for 3D printing? It is estimated that the first material that comes to mind in the 3D printing industry is photosensitive resin. Photosensitive resin is a kind of 3D printing material. It is similar to ABS material. It has a smooth surface and high precision. The surface can be painted and the hardness is also acceptable. Photosensitive resin is very suitable for printing prototype models, such as design models, and there are special requirements for functions in addition to appearance, such as high temperature resistance or higher toughness.
Photosensitive resin is formed by SLA/DLP technology. SLA is also called photo-curing molding. It uses ultraviolet light or other light beams to cure liquid photosensitive resin. Photosensitive resin, literally, is a resin material that is sensitive to light, and will be cured quickly after light irradiation.
Compared with SLA, the DLP printed items have a smooth surface and high molding quality, so many DLP models are positioned as jewelry grades. The following is a detailed introduction to the characteristics and application of photosensitive resin.
Characteristics of photosensitive resin
Photosensitive resin is generally in a liquefied state, and objects printed with this material generally have the characteristics of high strength, high temperature resistance, and water resistance. However, the photosensitive resin material is not used for a long period of time, which easily leads to hardening.
The specific characteristics of photosensitive resin are as follows
1. Low viscosity;
2. Small curing shrinkage;
3. Fast curing rate;
4. Small swelling;
5. High light sensitivity;
6. High degree of curing;
7. High wet strength.
In addition, the price of photosensitive materials is relatively expensive compared to desktop-grade PLA, and at the same time, because it needs to be poured into the container during use, it is easy to cause waste.
Application of photosensitive resin
The finished product of 3D printing of photosensitive resin material has very good details and high surface quality, and can be colored by spray painting and other processes. However, items printed with photosensitive resin will gradually become brittle and yellow if exposed to light for a long time. This kind of material is mostly used for printing fine models and complex design models that have high requirements on model accuracy and surface quality, such as hand-made, hand-made, jewelry or precision assembly parts. But it is not suitable for printing large models. If you need to print large items, you need to print them apart.
In addition to the high toughness, high temperature resistance and ordinary photosensitive resin mentioned above, there are translucent and fully transparent photosensitive resins. However, it should be reminded that both semi-transparent and full-transparency printing needs to be post-polished. Where it cannot be polished, the transparency will be slightly worse.
Photosensitive resin material is not only good in molding effect, but also relatively cheap, so it has become the material of choice for printing prototypes. It is really cost-effective to make a sample for appearance and function verification before the product is launched. Compared with direct production without proofing, it can save a lot of money.
However, many customers have such a question, photosensitive resin as a liquid material, there are chemical smells, then it is toxic?
In fact, the photosensitive resin material cannot simply be said to be toxic or non-toxic. The toxicity must be discussed in conjunction with the dosage. Generally, after normal light curing, there is no problem. The photo-curable resin is the matrix resin of the photo-curable coating. It is compounded with the photoinitiator, reactive diluent and various additives to form the photo-curable coating. Light-curing coatings are the earliest examples of large-scale successful application of light-curing technology in industry, and are currently the products with the largest production and sales in the field of light-curing industry, so they can be assured of contact.
In fact, judging from the chemical materials we commonly use in life, it is not difficult to find that most polymers are non-toxic and usually used plastics. In fact, many melamine tablewares, that is, plastics that are somewhat like porcelain are Melamine, melamine should be familiar to everyone, but its polymer is non-toxic, of course, some black workshops use poor raw materials or poor craftsmanship, which is indeed toxic.
Therefore, users who worry that the photosensitive resin material is toxic and may cause harm to the human body can rest assured that as long as the photosensitive resin material you purchase is regular, in addition to the need to pay attention to ventilation protection during the printing process, the items after 3D printing are non-toxic. You can use and contact with confidence.