Stereolithography rapid protoyping photosensitive resin prepared by using polypropylene glycol diglycidyl ether diacrylate as prepolymer, and preparation method for stereolithography rapid protoyping photosensitive resin

Abstract

The invention discloses a stereolithography rapid protoyping photosensitive resin prepared by using polypropylene glycol diglycidyl ether diacrylate as prepolymer, and a preparation method for the stereolithography rapid protoyping photosensitive resin. The resin is characterized by being prepared from the following raw materials in percentage by mass: 10 to 70 percent of polypropylene glycol diglycidyl ether diacrylate, 5 to 75 percent of epoxy resin, 5 to 55 percent of oxacyclobutane compound, 1 to 12 percent of cationic initiator, and 1 to 10 percent of free radical photopolymerization initiator. The method comprises the following steps of: mixing the raw materials in the mass ratio, and stirring at the temperature of between 20 and 80 DEG C for 5 to 120 minutes to ensure that a mixture becomes transparent faint yellow uniform liquid. The prepared photosensitive resin is low in irritation and volatile matter content, and is easy and convenient to prepare, and is high in photosensitiveness; and the critical exposure capacity Ec of the resin is less than 16.0mJ / cm<2>; formed parts are high in precision, and the camber factor CF(6) of the formed parts is + / -0.01, and CF (11) is + / -0.03. Parts with any complex shape and high precision can be directly prepared from the resin and the preparation cost of the resin is much lower than that of the photosensitive resins of the same kind.

Description

Technical field [0001] The invention belongs to the field of rapid prototyping manufacturing and relates to the use of polypropylene glycol diglycidyl ether diacrylate as a prepolymer and its application in the preparation of stereolithography rapid prototyping photosensitive resin. Background technique [0002] The emergence of rapid prototyping makes it easy and fast to manufacture complex parts or molds. The commonly used rapid prototyping process is UV laser curing rapid prototyping (commonly known as: stereolithography rapid prototyping). It uses ultraviolet laser to scan the photosensitive resin liquid surface point by point according to the shape of the two-dimensional cross-section to solidify the resin. The cured resin A two-dimensional figure is formed, which is scanned and solidified layer by layer, and finally a complete three-dimensional entity can be obtained. In stereolithography rapid prototyping, the photosensitive resin used is developed on the basis of tr...

AI Technical Summary

Problems solved by technology

In these two patents, the acrylate prepolymers used in the preparation of photosensitive resins are bisphenol A epoxy acrylate, novolac epoxy acrylate and pentaerythritol triacrylate. The disadvantages of these prepolymers are The cured product is brittle and the viscosity of the prepolymer is relatively high, so it is necessary to add thinners such as trimethylolpropane triacrylate, tripropylene glycol diacrylate and 1,6-hexanediol diacrylate to adjust the viscosity. The viscosity of photosensitive resin, and these diluents are highly volatile and irritating, and have certain pollution to the working environment