Piezoelectric composite material capable of being subjected to 3D printing/hot press molding and preparation method thereof

A piezoelectric composite material and hot-press forming technology, applied in the field of materials, can solve the problems of inability to provide piezoelectric activity, complex process, difficult degradation, etc., and achieve moderate piezoelectricity, simple preparation process, and good biocompatibility. Effect

CN114220912APending Publication Date: 2022-03-22INST OF MEDICINE & HEALTH GUANGDONG ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2022-03-22

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Abstract

The invention discloses a piezoelectric composite material capable of being subjected to 3D printing / hot press molding and a preparation method thereof. The piezoelectric composite material comprises the following components: surface modified barium titanate and a polymer. The surface modified barium titanate provided by the invention has excellent biocompatibility, and the piezoelectric composite material which can be formed by the surface modified barium titanate and a polymer and can be subjected to 3D printing / hot press molding has moderate piezoelectric property and mechanical property; the piezoelectric composite material is obtained by mixing the surface-modified barium titanate with the polymer and then carrying out processing molding and electric polarization, and the piezoelectric composite material is simple in preparation process, mild in condition, low in cost and suitable for industrial batch production; the piezoelectric composite material can be widely applied to the field of biomedical materials.
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Description

technical field

[0001] The invention belongs to the technical field of materials, and in particular relates to a piezoelectric composite material capable of 3D printing / hot pressing and a preparation method thereof. Background technique

[0002] Large-scale bone damage caused by injury, disease, or trauma often lacks the ability to repair itself, and the repair of bone defects has always been a clinically difficult problem, although autografts and allografts have been clinically approved and shown to be satisfactory However, in clinical practice, donor site disease, immune and inflammatory reactions often appear. Reconstruction of defective bone tissue through tissue engineering is currently an ideal solution. Studies have confirmed that human bone is a special "piezoelectric material" with bioelectric phenomena and piezoelectric properties. The piezoelectric coefficient of human bone is about 0.7pC / N, and the piezoelectric properties of bone are mainly derived from collage...

Examples

Embodiment 1

[0063] The preparation method of the piezoelectric composite material in this example is as follows:

[0064] 200 parts by mass of barium titanate, 900 parts by mass of ethanol, and 100 parts by mass of water were added to the reaction flask. Ultrasonic dispersion for 0.5 h, magnetic stirring for 0.5 h, repeat this 3 times, then add 4 parts by mass of KH550, heat to 45°C and mechanically stir for 12 h. Centrifuge, wash, and repeat three times to obtain the dried modified barium titanate (BT).

[0065] 24.3 parts by mass of modified BT, 200 parts by mass of methylene chloride, and 7.5 parts by mass of 3-hydroxybutyrate and 3-hydroxyvalerate copolymer (PHBV) were added to the beaker. Ultrasonic dispersion for 0.5h, magnetic stirring for 0.5h, repeated 3 times, magnetic stirring for 4h, adding ethanol precipitant to precipitate the composite material, filter and dry.

[0066] After the composite material is hot-pressed (heating temperature is 175°C, pre-pressing pressure is 8MP...

Embodiment 2

[0068] The preparation method of the piezoelectric composite material in this example is as follows:

[0069] 200 parts by mass of barium titanate, 1000 parts by mass of water, and Trish-HCl solution were added into the reaction flask to make pH = 7.4. Ultrasonic dispersion for 0.5 h and magnetic stirring for 0.5 h were repeated three times, then 4 parts by mass of dopamine hydrochloride was added and heated to 45° C. and mechanically stirred for 12 h. Dopamine hydrochloride self-polymerized to embed barium titanate particles. Centrifuge, wash, and repeat three times to obtain the dried modified barium titanate.

[0070] 18.2 parts by mass of modified BT, 200 parts by mass of methylene chloride and 7.1 parts by mass of polycaprolactone (PCL) were added to the beaker. Ultrasonic dispersion for 0.5h, magnetic stirring for 0.5h, repeated 3 times, magnetic stirring for 4h, adding ethanol precipitant to precipitate the composite material, filter and dry.

[0071] After the compos...

Embodiment 3

[0073] The preparation method of the piezoelectric composite material in this example is as follows:

[0074] 200 parts by mass of barium titanate, 900 parts by mass of ethanol, and 100 parts by mass of water were added to the reaction flask. Ultrasonic dispersion for 0.5h, magnetic stirring for 0.5h, repeat 3 times, add 4 parts by mass of γ-aminopropyltriethoxysilane coupling agent, heat to 45°C and mechanically stir for 12h, centrifuge, wash, repeat three times to obtain dried Modified barium titanate.

[0075] 15.2 parts by mass of modified BT, 200 parts by mass of methylene chloride and 9.4 parts by mass of polylactic acid (PLA) were added to the beaker. Ultrasonic dispersion for 0.5h, magnetic stirring for 0.5h, repeated 3 times, magnetic stirring for 6h, adding ethanol precipitant to precipitate the composite material, filter and dry.

[0076] After the composite material is thermoformed (heating temperature is 195°C, pre-pressing pressure is 8MPa, pre-pressing time is...