3D printing photosensitive resin with ultra-low volume shrinkage and preparation method thereof

Abstract

The method of the present invention mainly adopts the self-filling method of 3D printing photosensitive resin material, and uses the cured product of the photosensitive resin itself as the filling material to reduce the volume shrinkage of the photosensitive resin. The method can effectively reduce the volume shrinkage rate of the radical type photosensitive resin, increase the compatibility between the filler and the original system, and improve the dispersibility and stability of the filler in the system.

Description

technical field [0001] The invention belongs to the field of functional organic polymer materials, and in particular relates to a 3D printing photosensitive resin. Background technique [0002] 3D printing technology, also known as additive manufacturing technology, is a technology based on digital files, using materials such as micron-sized metal powder, thermoplastic or liquid photosensitive resin, to construct three-dimensional objects by layer-by-layer printing. 3D printing technology has many outstanding advantages: workpieces with complex structures that cannot be produced by traditional techniques can be directly obtained from the data model, and no additional processing is required in the middle; the sample manufacturing cycle is short; material waste is small, and there is basically no leftover material; unused Materials can be reused etc. It is precisely because of these advantages that 3D printing is called the "third industrial revolution", the 21st most valuabl...

AI Technical Summary

Problems solved by technology

However, the essential difference between inorganic fillers and organic photosensitive resins makes the two not completely compatible. Most of the time, inorganic fillers are suspended in the photosensitive resin system through high-speed dispersion, which not only has high requirements for equipment during dispersion, but also in Agglomeration, precipitation, etc. are prone to occur during use, which seriously affects the stability of the product

In some special application scenarios, inorganic fillers cannot be used at all. For example, photosensitive resins for casting require that the resin can be completely decomposed at high temperature without residues. If inorganic fillers cannot be decomposed, there will be a large amount of residues, so they cannot be used

[0006] Currently, the commonly used inert resins are aldehyde and ketone resins, high molecular weight epoxy resins, rosin resins, and vinyl chloride resins. Shrinkage. Compared with inorganic fillers, the compatibility of these inert resins with photosensitive resins is greatly improved, which has little impact on the performance of the entire system and good stability. However, the compatibility of inert resins is not as good as that of inorganic fillers. Currently, the types of inert resins that can be selected Not many, and not suitable for all photosensitive resin systems

[0007] Adding monomers with expansion properties to compensate for the curing shrinkage of photosensitive resins is another method to reduce the volume shrinkage of photosensitive resins. However, there are few types of monomers with expansion properties, and the price is high, so the large-scale application is limited.