A kind of hydrophobic thermoplastic degradable microcrystalline cellulose/starch film and preparation method thereof
A microcrystalline cellulose and thermoplastic technology, which is applied in the field of hydrophobic thermoplastic degradable microcrystalline cellulose/starch film and its preparation, can solve the problems of less water resistance and degradability of microcrystalline cellulose modified and then reinforced starch film. , to achieve the effect of enhanced water resistance, uniform particle size and good water resistance
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Embodiment 1
[0047] A method for preparing hydrophobic thermoplastic degradable microcrystalline cellulose / starch film, comprising the steps of:
[0048] (1) Modification of microcrystalline cellulose:
[0049] 6g APTES and 125mL ethanol aqueous solution (the volume ratio of ethanol and water is 75:25) were stirred at 25°C (room temperature) at a speed of 300r / min for 30min, then 1.2g of microcrystalline cellulose was added, and the reaction was carried out at 55°C for 2h , after the reaction, washed twice with absolute ethanol, then twice with deionized water, and finally dried at 50 °C for 3 hours to obtain modified microcrystalline cellulose;
[0050] (2) Preparation of film-forming liquid:
[0051] 0.35g of the modified microcrystalline cellulose of step (1), 5g of corn starch, and 90mL of water were gelatinized together at a rotational speed of 150r / min and 90°C for 1h, and then 1.5g of a deep eutectic solvent (choline dihydrogen citrate) was added. and glycerol according to the mas...
Embodiment 2
[0055] Adjust the dosage of microcrystalline cellulose (MCC) in step (1) of Example 1 to 2g and 0.75g, so that the mass ratio of MCC and APTES is 1:3 and 1:8; Sexual microcrystalline cellulose / starch film.
[0056] The obtained modified microcrystalline cellulose / starch film is tested for performance, and the test results are as follows in Table 1, Table 2 and figure 1 , figure 2 :
[0057] It can be seen from Table 1 and Table 2 that the tensile strength of Example 1 is higher than that of MCC: APTES modification ratio of 1:3 and 1:8, namely Example 2, the elongation at break of Example 1 is slightly lower than 1:3 and 1:8, but the contact angle of Example 1 is about 28.5° higher than that of 1:3, and 13.5° higher than that of 1:8. Has better water resistance. The degradation rate of the modified microcrystalline cellulose / starch film of Example 1 can reach 73.24% in 20 days, which is slightly slower than that of Example 2. The water vapor transmission amount of Example...
Embodiment 3
[0064] The mass ratios of choline dihydrogen citrate and glycerol in Example 1 were adjusted to 1:1 and 3:1; the others were the same as those in Example 1, and the modified microcrystalline cellulose / starch film was obtained.
[0065] The obtained modified microcrystalline cellulose / starch film is tested for performance, and the test results are as follows in Table 3 and Table 4:
[0066] As can be seen from Table 3 and Table 4: by comparing Example 3 and Example 1, it is concluded that under different ratios of citric acid and glycerol, the tensile strength and contact angle of the film are affected to a certain extent, and the elongation at break is The 1:1 ratio of choline dihydrogen citrate / glycerol reached 52.23%, which is the maximum value in several examples, but at the same time, its tensile strength was measured as a lower value: 6.45MPa, looking at the plasticizer addition as a whole The ratio of , has no significant effect on the contact angle of the film. The deg...
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