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UV-PU dual-curing 3D printing resin and preparation method and application thereof

A dual-curing, resin technology, applied in the field of 3D printing materials, can solve the problems of high shrinkage, increased viscosity, limited use, etc., and achieve the effect of improving the degree of reaction, reducing shrinkage, and enhancing mechanical properties

Active Publication Date: 2019-02-12
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fast curing rate and good mechanical properties require high crosslinking density. Traditional photocurable resins only crosslink and cure through double bond reactions, and their high crosslinking density will inevitably lead to high shrinkage.
Secondly, polymers with large molecular weight have excellent performance, but excessive molecular weight leads to increased viscosity, which limits their use in 3D printing

Method used

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  • UV-PU dual-curing 3D printing resin and preparation method and application thereof
  • UV-PU dual-curing 3D printing resin and preparation method and application thereof
  • UV-PU dual-curing 3D printing resin and preparation method and application thereof

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Experimental program
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Effect test

Embodiment

[0021] 1. Add organic acid, epoxy monomer, catalyst and polymerization inhibitor according to Table 1 in a 500ml four-necked flask with mechanical stirring, temperature control thermocouple and condenser. Heat and stir, keep the temperature at 80°C until the system becomes transparent, raise the temperature to 100°C, and continue the reaction until the acid value is lower than 20-10mgKOH / g. The prepolymer is at least one of formula 1 to formula 4.

[0022] 2. According to Table 2, take the above-mentioned prepolymer in a beaker, add photoinitiator, diluent and curing agent in another beaker, keep away from light and stir until the photoinitiator is completely dissolved, pour it into the prepolymer, avoid Stir until it is transparent and uniform, and prepare the resin for later use.

[0023] 3. Use a laser stereolithography (SLA) 3D printer to print out a standard tensile test sample according to the ISO527 standard. The samples were baked in an oven at 120°C for 2h.

[0024...

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Abstract

The invention provides a preparation method of ultraviolet-polyurethane (UV-PU) dual-curing rein for 3D printing. The dual-curing resin contains pre-polymers with the structural formula as shown in the formula 1, the formula 2, the formula 3 and the formula 4, wherein R1 represents methyl or hydrogen, R2 and R3 represent alkylene, cycloalkylene and arylidene, R2 and R3 can be the same or different, and R4 is arylidene, alkylene and cycloalkylene. (The formulas are shown in the description). A low-viscosity polyurethane curing agent added into a UV-PU dual-curing system is equivalent to a diluent in the 3D printing process, and serves as a curing agent in the post-curing process, the polyurethane curing agent reacts with hydroxy in the low polymer for further curing, the connection strengthamong the layers of a printout is improved, and meanwhile, the mechanical performance and the thermal stability of the printout are enhanced. The dual-curing 3D printing resin has the advantages of high tensile strength, high breaking elongation, low shrinkage rate and low viscosity.

Description

technical field [0001] The invention relates to the technical field of 3D printing materials, in particular to a UV-PU dual-curing low-viscosity 3D printing material. Background technique [0002] In recent years, 3D printing technology has developed rapidly and has a wide range of applications, involving the automobile industry, medical equipment, human organs, mold manufacturing and other industries. The main reason why 3D printing can be recognized is that it can be rapidly prototyped, can meet high-precision requirements, and can also print complex structures that cannot be molded by general molds. At present, 3D printing technologies are widely used, such as Fused Deposition Modeling (FDM), Laser Stereo Printing (SLA), and Digital Light Processing (DLP). FDM is thermoplastic molding. This technology is to print the target product through the computer control program under the condition of high temperature melting of thermoplastic resin. Photocuring molding is to trigg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F265/06C08F220/20C08F222/20C09D175/04C09J175/04B33Y70/00
CPCB33Y70/00C08F265/06C09D175/04C09J175/04C08F222/102
Inventor 周照喜李悦微龚翠然罗震郑杨清余利明许莹吴立新
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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