Ultraviolet-cured silicone rubber for DIW (direct ink writing) 3D (three-dimensional) printing and preparation method thereof

Abstract

The invention relates to ultraviolet-cured silicone rubber for DIW (direct ink writing) 3D (three-dimensional) printing and a preparation method thereof. The ultraviolet-cured silicone rubber is prepared from the following raw materials in percentage by weight: 50-80% of polysiloxane containing unsaturated groups, 1-10% of a sulfydryl-containing cross-linking agent, 0.1-10% of a photoinitiator, 1-10% of rheological modifier, 6-40% of a filler and 5-20% of reinforcing resin. According to the ultraviolet-cured silicone rubber and the preparation method thereof, the polysiloxane containing the unsaturated groups, the sulfydryl-containing cross-linking agent and the rheological modifier are subjected to quick reaction and curing under ultraviolet irradiation, proper rheological property enables DIW (direct ink writing) 3D (three-dimensional) printing to be carried out more efficiently, a printed product has the characteristics of high elasticity and high strength, especially shows outstanding advantages in the aspect of the strength, meanwhile, has appropriate hardness, and has no unpleasant smell after being cured, the toxicity is low, the pollution is small, and the size precision controllability of a printing material is realized.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to an ultraviolet-cured silicone rubber for DIW3D printing and a preparation method thereof. Background technique [0002] The 3D printing technologies for photosensitive polymer materials mainly include: Digital Light Processing technology (Digital Light Processing, DLP), stereolithography rapid prototyping technology (Stereolithography, SLA), continuous liquid interface extraction technology (Continuous Liquid Interface Production technology, CLIP) And direct ink writing technology (Direct ink writing, DIW) and so on. Different printing methods have different requirements on materials, which are mainly reflected in the viscosity of materials, the choice of fillers, and the curing rate. [0003] DIW3D printing technology can be used to prepare materials of various materials and properties, and its application fields are very wide, including flexible electronics, struct...

AI Technical Summary

Problems solved by technology

[0011] In summary, the main problems of 3D printing materials in the currently reported methods are as follows: most materials are thermosetting resins, not real rubber materials; the photosensitive platinum catalyst with special structure is expensive; the synthesis method of acrylic silicone materials is complex and difficult to cure There is also the problem of oxygen inhibition; acrylate and silicone have compatibility problems, the mechanical properties of the product are low, and the elasticity is poor; structures such as acrylic and epoxy resin modified silicone will greatly reduce the high and low temperature resistance of silicone rubber. Performance; the material system is limited by the printing method and it is difficult to achieve the ideal mechanical properties

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