Titanium-dioxide-modified silk and preparation method thereof
A technology of titanium dioxide and hydrated titanium dioxide, applied in textiles and papermaking, fiber treatment, animal fibers, etc., can solve problems such as low temperature resistance, lower mechanical properties, and destroy protein structure, and achieve low cost, improved fracture strength and toughness, and preparation The effect of simple process
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Embodiment 1
[0036]The degummed mulberry silk was directly immersed in n-butyl titanate / petroleum ether solution with a volume ratio of 1:99 for 20 seconds, then taken out and placed in humid air with a relative humidity of 50% for 48 hours to obtain modified silk with a breaking strength of 500 MPa. The fracture energy is 48MJ / m 3 The thermal degradation temperature reaches 289°C, and the glass transition temperature reaches 230°C; the light intensity of the titanium dioxide modified silk is 1245μW / cm 2 And there is no obvious loss of breaking strength after 3 hours of ultraviolet irradiation with a wavelength of 390nm, the bacteriostatic zone against Escherichia coli is 13.6mm, and the thickness of hydrated titanium dioxide on the fiber surface is 200nm.
Embodiment 2
[0038] The degummed tussah silk was directly immersed in n-butyl titanate / petroleum ether solution with a volume ratio of 1:99 for 20 seconds, then taken out and placed in humid air with a relative humidity of 50% for 48 hours to obtain modified silk with a breaking strength of 550 MPa. The fracture energy is 54MJ / m 3 ; The thermal degradation temperature reaches 290°C, and the glass transition temperature reaches 230°C; the light intensity of the titanium dioxide modified silk is 1245μW / cm 2 And there is no obvious loss of breaking strength after irradiating with ultraviolet rays with a wavelength of 390nm for 3 hours, the antibacterial zone against Escherichia coli is 13.5mm, and the thickness of hydrated titanium dioxide on the fiber surface is 200nm.
Embodiment 3
[0040] The wet-spun regenerated silk protein fibers were directly immersed in the n-butyl titanate / petroleum ether solution with a volume ratio of 1:99 for 20 seconds, taken out, and then placed in humid air with a relative humidity of 50% for 48 hours to obtain modified silk. Strength is 400MPa, fracture energy is 40MJ / m 3 ; The thermal degradation temperature reaches 288.7°C, and the glass transition temperature reaches 230°C; the light intensity of the titanium dioxide modified silk is 1245μW / cm 2 And there is no obvious loss of breaking strength after irradiating with ultraviolet rays with a wavelength of 390nm for 3 hours, the antibacterial zone against Escherichia coli is 13.5mm, and the thickness of hydrated titanium dioxide on the fiber surface is 200nm.
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