Composition

Abstract

The present application relates to a composition, a 3D printing method using the same, and a three-dimensional shape comprising the same, and provides a composition capable of embodying a precise formation of a three-dimensional shape using a ceramic material and a uniform curing property of the three-dimensional shape.

Claims

1. A composition comprising ceramic particles, and magnetic particles having at least two magnetic domains, wherein the magnetic domains are irregularly arranged when an external magnetic field is absent and are magnetized by an external magnetic field, wherein the magnetic particles comprise those having surface-treated particle surfaces, and wherein the magnetic particles have a coercive force in a range of 1 to 200 kOe, wherein the magnetic particles surround the ceramic particles, or the ceramic particles surround the magnetic particles, whereby magnetic composites are formed, wherein the composition further comprising second ceramic particles, wherein the magnetic composites and the second ceramic particles are each comprised in a ratio of 1 to 20 parts by weight and 20 to 95 parts by weight.

2. The composition according to claim 1, wherein the ceramic particles comprise at least one oxide, nitride or carbide selected from the group consisting of silicon (Si), aluminum (Al), titanium (Ti) and zirconium (Zr).

3. The composition according to claim 1, wherein the ceramic particles have an average particle size in a range of 0.1 μm to 5 μm.

4. The composition according to claim 1, wherein the magnetic particles have a saturation magnetization value at 25° C. in a range of 20 to 150 emu/g.

5. The composition according to claim 1, wherein the magnetic particles have an average particle size in a range of 20 to 300 nm.

6. The composition according to claim 1, wherein the magnetic domains have an average size in a range of 10 to 50 nm.

7. The composition according to claim 1, wherein the magnetic particles satisfy Formula 1 below:
MX.sub.aO.sub.b  [Formula 1] wherein, M is a metal or a metal oxide, when M is the metal oxide, |a×c|=|b×d| is satisfied, and when M is the metal, |(1×z)+(a×c)|=|2×b| is satisfied, where X includes Fe, Mn, Co, Ni or Zn, c is the cation charge of X, and d is the anion charge of oxygen, and z is the cationic charge of M.

8. The composition according to claim 1, wherein the magnetic particles are vibrated by magnetization reversal.

9. The composition according to claim 1, further comprising a thermosetting resin.

10. The composition according to claim 1, further comprising a thermosetting agent.

11. The composition according to claim 1, further comprising a resin soluble in a water-based or alcohol phase.

12. The composition according to claim 1, further comprising a thermal acid generator or a thermal base generator.

13. A 3D printing method comprising applying the composition of claim 1 to form a three-dimensional shape.

14. The 3D printing method according to claim 13, further comprising applying a magnetic field to the applied composition.

15. The 3D printing method according to claim 14, wherein the applying a magnetic field comprises at least two steps of multi-profile methods.

16. A three-dimensional shape comprising a cured product of the composition of claim 9.

Description

BEST MODE

(1) Hereinafter, the present invention will be described in more detail with reference to Example complying with the present invention and Comparative Examples not complying with the present invention, but the scope of the present invention is not limited by the following examples.

Example 1

(2) A silica sol gel solution was prepared, which comprises 1 g of nanomagnetic composites having a structure in which the surfaces of FeOFe.sub.2O.sub.3 particles (Multi-Magnetic Domains, average particle size about 100 nm: measured by Field Emission Scanning Electron Microscope (using DLS)), which are a soft magnetic material (Soft Type), as magnetic particles, were surface-treated with SiO.sub.2 (particle size about 10 nm) as ceramic particles in a thickness of 10 nm, 10 g of alumina particles having a particle size of about 1 to 3 μm, 2 g of zirconium particles, 5 g of silica particles, 4.5 g of sodium silicate, 14 g of water and 0.2 g of a thermal acid generator (TAG2678).

(3) Immediately after laminating the composition on a support through a nozzle in a feeding device, a magnetic field was applied thereto at a current value of 300 A for 5 minutes in an external alternate-current magnetic field generator. The magnetic field was applied by introducing the composition into a sample vial in a solenoid coil (3 turns, OD 50 mm, ID 35 mm) and adjusting the current value and time of the magnetic field generator (Easyheat from Ambrell). The composition was thermally cured with vibrational heat generated through application of the magnetic field to form a pattern or a three-dimensional shape.

Example 2

(4) A composition was prepared in the same manner as in Example 1, except that 6 g of tetraethyl orthosilicate was added thereto instead of sodium silicate, and allowed to form a pattern or a three-dimensional shape.

Example 3

(5) A composition was prepared in the same manner as in Example 1, except that 5 g of sodium meta-silicate was added thereto instead of sodium silicate, and allowed to form a pattern or a three-dimensional shape.

Example 4

(6) A composition was prepared in the same manner as in Example 1, except that an ammonium salt derivative as a thermal base generator was added thereto instead of the thermal acid generator, and allowed to form a pattern or a three-dimensional shape.

Example 5

(7) A composition was prepared in the same manner as in Example 2, except that an ammonium salt derivative as a thermal base generator was added thereto instead of the thermal acid generator, and allowed to form a pattern or a three-dimensional shape.

Comparative Example 1

(8) A composition was prepared in the same manner as in Example 1, except that FeOFe.sub.2O.sub.3 particles (Single-Magnetic Domain, average particle size about 100 nm), which are a ferromagnetic material (Hard Type), as magnetic particles, were used, and allowed to form a pattern or a three-dimensional shape.

Experimental Example 1—Measurement of Cure Degree (Visual, Touch)

(9) After curing the composition, it was confirmed whether the cured product had flowed when it was turned over after cooling, and then the curing was confirmed by checking the degree of pressing of the cured product with a metal spatula. In the above, it can be confirmed that when there is flowability and the cured product is pressed, the composition has been not cured.

(10) TABLE-US-00001 TABLE 1 Measurement of Cure Degree Example 1 Cured Example 2 Cured Example 3 Cured Example 4 Cured Example 5 Cured Comparative Non-cured Example 1