▎ 摘　　要

NOVELTY - Composition system comprises mixed dispersion of siloxane hydrolyzate and alkaline solution, low surface energy polymer solution, and inorganic filler. USE - The composition system is useful for preparing fully degradable and/or recyclable 3D printed piece (claimed). ADVANTAGE - The 3D printing piece has high mechanical property, and mechanical property after completely degraded and recycled is flat with the initial piece. It has heat resistance, antifouling property and has wide application prospect. It can be completely degraded into monomer in water or aqueous solvent under the condition of heating, realizing complete degradation and recycling of the product, the recycling method is simple and the recycling efficiency is high; it can be repeatedly used for multiple times of printing forming, and the material utilization rate is high. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: a three-dimensional (3D) printing piece, prepared from the composition system of, where the 3D printed piece is fully degradable and recyclable; a method for preparing a 3D printed piece, comprising mixing the mixed dispersion of siloxane hydrolyzate and an alkaline solution, low surface energy polymer solution and inorganic filler to prepare composition system and subjecting composition system to 3D printing, drying and heat treatment; and a method for recycling 3D printed piece, comprising placing 3D printed part in water or an aqueous solvent for a period of time to obtain sol dispersion, where the aqueous solvent is mixed solvents of water and organic solvent.