Method for preparing photosensitive ceramic precursor for manufacturing ceramic products by additive manufacturing technology

A technology of additive manufacturing and photosensitive ceramics, which is applied in the field of photosensitive ceramic precursor preparation, can solve the problems of difficult strength and reliability of ceramic products, enlarge the internal defects of ceramics, time-consuming and labor-intensive problems, and achieve high-efficiency photo-curing performance, compact structure, The effect of smooth appearance

CN108676166AActive Publication Date: 2018-10-19NORTHWESTERN POLYTECHNICAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-10-19

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Abstract

The invention discloses a method for preparing a photosensitive ceramic precursor for manufacturing ceramic products by an additive manufacturing technology; the method comprises the following steps:carrying out hydrolysis reaction of (chloromethyl)methyldichlorosilane with dichloromethylvinylsilane to obtain linear polysiloxane, then carrying out end-capping reaction of dimethylvinylchlorosilanewith linear polysiloxane, and carrying out reaction of the end-capped polysiloxane with 2-hydroxyethyl acrylate and triethylamine to obtain the photosensitive ceramic precursor. The UV-curable polysiloxane ceramic precursor is prepared, and the obtained photosensitive ceramic precursor can achieve 80% of double-bond conversion rate when being irradiated by ultraviolet light for 30 s and 90% of double-bond conversion rate when being irradiated by ultraviolet light for 40 s with the addition of a suitable initiator. The photosensitive ceramic precursor has quite high-efficiency photocuring performance. With the photosensitive ceramic precursor as the raw material, the stereolithography technology is used for additive manufacturing, and the cured product with regular appearance is obtained and has bright and clean appearance and high strength.
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Description

technical field

[0001] The invention belongs to the technical field of additive manufacturing of ceramic materials, and in particular relates to a method for preparing a photosensitive ceramic precursor used in additive manufacturing technology to manufacture ceramic products. Background technique

[0002] Compared to metals and polymers, ceramics are difficult to machine, especially into complex shapes. Ceramics have a high melting point and hardness, but poor toughness, which makes it difficult to process ceramics by casting or cutting. Traditional ceramic processing is usually solidified by sintering ceramic powder or depositing ceramics in a thin film. The generation of defects in this processing process is inevitable, such as pores and inhomogeneity, and the density and uniformity of ceramics determine the performance of ceramics. Therefore, it is difficult to obtain ceramic products with good performance by such processing methods.

[0003] Ceramics are difficult to ...

Examples

Embodiment 1

[0038]A method for preparing a photosensitive ceramic precursor for manufacturing ceramic products by additive manufacturing technology, the synthesis route is as follows:

[0039]

[0040] In the formula, n is a positive integer;

[0041] The specific synthesis method is as follows:

[0042] Step 1, as shown in the formula (I), the Schlenk bottle with a capacity of 250mL is pretreated to ensure that the gas in the bottle is Ar gas, and it is anhydrous and oxygen-free, and then under the protection of Ar gas, 38.98mL of chloromethyl formazan Dichlorosilane and 40.40mL dichloromethylvinylsilane were added to the Schllenk bottle, and mixed evenly under 500rpm magnetic stirring; then 10mL deionized water was added dropwise to the above-mentioned Schllenk bottle at a rate of 1 drop / 10s In, add HCl gas absorption bottle on the Schllenk bottle after the dropwise addition to absorb the HCl gas produced in the reaction process; react at room temperature until no bubbles are produc...

Embodiment 2

[0052] The photosensitive ceramic precursor added with a photoinitiator is used as a raw material, and a Form2 3D printer is used for 3D printing operation, and a simple three-dimensional structure is printed. The printing result is as follows: figure 2 shown.

[0053] from figure 2 It can be seen that the surface of the printed three-dimensional structure is smooth and flat, the edges are sharp and tidy, the interior is uniform, there are no pores and cracks, and it has a certain strength. This result proves that the photosensitive ceramic precursor prepared by the present invention can be combined with immediate photocuring molding technology to prepare ceramic products by means of additive manufacturing, which has broad application prospects.

[0054] The above 3D printed samples were subjected to thermogravimetric analysis and thermal linear shrinkage calculation. The specific experimental process is as follows:

[0055] 1. Thermogravimetric analysis

[0056] Take 3-6...