Active coating modified polyethylene terephthalate material and preparation method thereof
A technology of polyethylene terephthalate and active coating, which is applied to PET surface bioactive coating, PET material modified by silk fibroin-based bioactive coating and its preparation field, can solve the problem of uncontrollable coating deposition Speed, shape and structure, and the amount of surface coating are not easy to control, so as to achieve the effects of low production cost, uniform coating and simple process
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Embodiment 1
[0025] Preparation of silk fibroin aqueous solution: Put 20g of silkworm cocoons into 4L of 0.5% sodium carbonate solution by mass and stir, boil for 60 minutes to remove sericin on the surface of silkworm cocoons, wash them with water and dry them at 60°C to prepare silk fibroin. Dissolve the dried silk fiber in the calcium chloride / water / ethanol ternary solvent with a molar ratio of 1:8:2, stir and dissolve at 80°C to form a silk fibroin solution, and then dialysis and filtration to remove impurities Obtain silk fibroin aqueous solution.
Embodiment 2
[0027] Cleaning of PET: Weave the PET fiber mesh (see the attached scanning electron microscope photo) figure 1 a, c; Infrared spectra see attached figure 2 a) Soak in 75% ethanol for half an hour, then ultrasonically treat for 10 minutes at room temperature to remove impurities adhering to the PET surface, then take it out and wash it with distilled water several times to remove residual ethanol, and dry it at room temperature to obtain a clean PET material.
Embodiment 3
[0029] Step 1: stirring and concentrating the aqueous silk fibroin solution obtained in Example 1 to obtain an aqueous silk fibroin solution with a mass concentration of 5 mg / mL;
[0030] Step 2: Preparation of silk fibroin coating: Soak the PET material obtained in Example 2 in the silk fibroin aqueous solution obtained in step 1 at a mass ratio of PET / silk fibroin of 10%, place it at 60°C, and control the water Parts volatilization rate is 10*10 -4 mg*mm -2 *h -1 , so that the silk fibroin molecules are deposited on the surface of the PET material. After the water in the silk fibroin aqueous solution is completely removed, the PET material is taken out, and the PET material modified by the silk fibroin coating is obtained (the scanning electron microscope photo of the surface coating is shown in the appendix figure 1 b, d; its infrared spectrum is shown in the appendix figure 2 b). The obtained PET material modified by silk fibroin coating has a coating weight of 9.5%; t...
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