What materials are most commonly used in 3D printing? Photosensitive resins are probably the first material that pops into the minds of people familiar with the 3D printing industry.Photosensitive resin is a kind of 3D printing material, it is similar to ABS material, the surface is smooth, high precision, the surface can be painted, the hardness is also all right.
Photosensitive resin is very suitable for printing hand plate model, such as appearance design model, but also in addition to appearance, function has special requirements, such as high temperature resistance or toughness.
Photosensitive resin is formed by SLA/DLP technology, SLA is also called photocuring molding, it uses ultraviolet light or other beam to cure liquid photosensitive resin. Photosensitive resin, literally, is a light-sensitive resin material that will cure and form quickly after light irradiation. Compared with SLA, items printed from DLP have smooth surfaces and high molding quality, so many DLP models are positioned as jewelry grade.
The characteristics and applications of photosensitive resin are introduced in detail below. Characteristics of photosensitive resin Photosensitive resin is generally liquefied, using the material to print objects generally have high strength, high temperature resistance, waterproof and other characteristics. However, the photosensitive resin material is easy to harden if not used for a long time.
The specific characteristics of photosensitive resin are as follows:
- Low viscosity;
- Shrinkage of solidification
- Fast curing rate
- Small swelling
- High light sensitivity
- High degree of curing
- High strength in wet state
In addition, the price of photosensitive materials is relatively expensive compared with tabletop grade PLA, and at the same time, it is easy to lead to waste because it needs to be poured into the vessel when used.
Application of photosensitive resin
The finished product of 3D printing of photosensitive resin material has good details, high surface quality, and can be colored through processes such as spray painting. But photosensitive resin printed items, if exposed to light conditions for a long time, will gradually become brittle and yellow. This material is mostly used in printing for model accuracy and surface quality requirements High precision models, complex design models, such as hand plates, handpieces, jewelry or precision assemblies, etc. However, it is not suitable for printing large models. If you need to print large models, you need to disassemble and print.
In addition to the above mentioned high toughness, high temperature resistance and ordinary photosensitive resins, there are translucent and fully transparent photosensitive resins. However, it needs to be reminded that both semi-transparent and fully transparent printing need to be polished in the later stage, and the transparency will be slightly worse if the place is not polished.
Photosensitive resin material is not only good molding effect, but also relatively cheap, so it has become the first choice of printing hand plate material. Make a sample to verify the feasibility of appearance and function before the product is launched.
This proofing fee is really very cost-effective, compared with direct production without proofing, can save a lot of money.
But there are also many people have such a question, photosensitive resin as a liquid material, chemical odor also has, so it is toxic?
In fact, photosensitive resin material can not simply say that it is toxic or non-toxic, toxic must be combined with the dose to talk about, generally normal light curing, there is no problem. The photocurable resin is the matrix resin of the photocurable coating, which is combined with photoinitiator, active diluent and various additives to form the photocurable coating. Light curing coating is the earliest example of the successful application of light curing technology in the industry on a large scale, and it is also the largest product in the field of light curing industry, so you can be assured to contact. In fact, from the point of view of the chemical materials we commonly use in life, it is not difficult to find that most polymers are non-toxic, usually used in plastic, in fact, now a lot of melamine tableware, that is, a bit like porcelain plastic is polymelamine, melamine we should not be unfamiliar, but its polymer is non-toxic, Of course, some black shops use bad raw materials or bad workmanship and that's really toxic.
Therefore, users who are worried about the photosensitive resin materials being toxic and causing harm to the human body can rest assured that as long as the photosensitive resin materials you purchased are formal, in addition to the need to pay attention to ventilation protection in the printing process, the 3D printed products are non-toxic and can be used and touched at ease.