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Dual-curing resin material for 3D printing and preparation method thereof

A resin material, dual curing technology, applied in the direction of additive processing, etc., can solve the problems of moisture deformation, poor interlayer adhesion, energy consumption, etc., to achieve the effect of not easy warping and cracking, strong interlayer adhesion, and thorough curing Effect

Active Publication Date: 2020-02-11
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are some problems with the photosensitive resin materials currently used in stereolithography printing technology (SLA): the photosensitive resin cannot be completely cured under low energy due to the effect of oxygen inhibition, which eventually leads to stickiness on the surface of 3D printed products. It cannot be molded; there are also 3D printing materials prepared by photothermal dual curing mechanism, but additional heating devices are required, energy consumption, product construction performance is not good, and storage stability is not good; at the same time, photosensitive materials used for 3D printing, after curing Shrinkage stress is generated during the process, which leads to problems such as poor interlayer adhesion, large shrinkage rate, and moisture deformation.

Method used

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  • Dual-curing resin material for 3D printing and preparation method thereof
  • Dual-curing resin material for 3D printing and preparation method thereof
  • Dual-curing resin material for 3D printing and preparation method thereof

Examples

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preparation example Construction

[0049] The present invention also provides a preparation method for the dual-curing resin material described in the above technical solution, comprising the following steps:

[0050] After vacuum mixing the urethane acrylate resin oligomer, acrylate, epoxy acrylate, vinyl ether, photoinitiator and functional auxiliary agent, vacuum defoaming is carried out to obtain a dual curing resin material.

[0051] In the present invention, the amount of each component used in the preparation method is consistent with the amount used in the aforementioned technical solution of the dual-curing resin material for 3D printing, and will not be repeated here.

[0052] In the invention, the urethane acrylate resin oligomer, acrylate, epoxy acrylate, vinyl ether, photoinitiator and functional auxiliary agent are mixed in vacuum. The present invention has no special limitation on the vacuum mixing method, and the vacuum mixing method well known to those skilled in the art can be used; in the emb...

Embodiment 1

[0068] Preparation of urethane acrylate resin oligomer: Add 397g of isophorone diisocyanate into a dry three-necked flask equipped with a stirrer, thermometer and reflux condenser, then add 207g of 2-hydroxyethyl acrylate, 0.1g After mixing dibutyltin silicate and 0.2g p-methoxyphenol in February, add the mixed solution dropwise into isophorone diisocyanate at a rate of 1 drop / 3 seconds at 20°C; The temperature of the reaction solution was raised to 40°C, and the NCO content in the system was measured by the di-n-butylamine method. When the NCO content did not change with time, the reaction solution was cooled to 20°C, and 395g of 3-aminopropyl was added dropwise at a rate of 1 drop / 3 seconds Triethoxysilane (ie KH550); after the dropwise addition, the temperature of the reaction solution was raised to 55°C, and the NCO content in the system was determined by the di-n-butylamine method no longer changed, and the reaction was stopped to obtain urethane acrylate resin oligomeriza...

Embodiment 2

[0071] The urethane acrylate resin oligomer was prepared in the manner of Example 1.

[0072] Preparation of composite modified resin material: 470g urethane acrylate resin oligomer, 120g tripropylene glycol diacrylate, 200g aliphatic epoxy acrylate, 200g triethylene glycol divinyl ether, 3g 1-hydroxy Add cyclohexyl phenyl ketone, 3g of 4,4'-dimethyldiphenyliodonium hexafluorophosphate, and 4g of antioxidant IRGANOX 1135 to the dispersing tank in turn, and vacuumize until the degree of vacuum is -0.1MPa, and then Stir and disperse evenly, then vacuum degassing under the condition of vacuum degree of -0.1MPa, fill with nitrogen to release the vacuum, discharge and pack, and obtain a dual-curing resin material for 3D printing

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Abstract

The invention belongs to the technical field of materials used for 3D printing, and specifically relates to a dual-cured resin material used for 3D printing and a preparation method thereof. The dual-cured resin material used for 3D printing provided by the invention is prepared from the following raw materials by mass: 30 to 60 parts of a urethane acrylate resin oligomer, 5 to 20 parts of acrylate, 20 to 40 parts of epoxy acrylate, 5 to 20 parts of vinyl ether, 1 to 10 parts of a photoinitiator and 0.01 to 5 parts of a functional auxiliary agent. According to the invention, with the urethaneacrylate resin oligomer and the acrylate as raw material resin, and by utilization of the characteristic of mixed polymerization of radical polymerized resin and cationic polymerized resin of the urethane acrylate resin oligomer and the acrylate, and combination of compound modification of a rapid-curing-promoting substance namely the epoxy acrylate and an active diluent namely the vinyl ether, problems like short induction period, severe curing shrinkage and immediate stop of a reaction after light quenches for radical polymerization of the raw material resin are solved, so a resin material is thorough in curing and has excellent mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of materials for 3D printing, and in particular relates to a dual-curing resin material for 3D printing and a preparation method thereof. Background technique [0002] 3D printing technology is a technology based on digital model files, using bondable materials such as powdered metal or plastic, and using layered processing and superposition forming to increase materials layer by layer to generate three-dimensional entities. Manufacturing" (AM, Additive Manufacturing) technology. 3D printing technology does not require complex molding processes, original embryos and molds, and a lot of manpower in the manufacturing process, thus simplifying the product manufacturing process, shortening the product development cycle, improving production efficiency and reducing Cost, making product manufacturing more intelligent, precise and efficient. [0003] Currently, 3D printing technologies include stereolithography (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/00C08F222/20C08F216/12B33Y70/00
CPCB33Y70/00C08F283/008C08F283/105C08F222/102
Inventor 邹美帅李晓东郭晓燕高明
Owner BEIJING INSTITUTE OF TECHNOLOGYGY