High-antibacterial modified nano lignin as well as preparation method and application thereof
A nano-lignin modification technology, applied in textiles and papermaking, water-repellent addition, coating, etc., can solve the problems of insufficient antibacterial performance, achieve the effect of enhancing antibacterial performance and improving high-value utilization efficiency
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Embodiment 1
[0024] A preparation method of highly antibacterial modified nano lignin, comprising the following steps:
[0025] (1) 1g of formic acid lignin was dissolved in 20mL of tetrahydrofuran solution, and then placed in a dialysis bag for dialysis for 3 days to obtain formic acid nano-lignin;
[0026] (2) Weigh 1g of 0.1% formic acid nano-lignin, 0.2g of glyoxal and 1g of PHGH, place them in a beaker in sequence, and heat at 90°C for 2 h. Using deionized water to dialyze in a dialysis bag (Mw=8000) for 3 days, a highly antibacterial modified nano-lignin was prepared with a size distribution range of 200-250 nm. The experimental results are shown in Figure 1.
[0027] (3) The ultraviolet absorption method was used to determine the effect of antibacterial modified nano-lignin on Escherichia coli ( E. coli ) antibacterial properties, the experimental results are shown in Figure 2 below.
Embodiment 2
[0029] A kind of preparation method of starch sizing paper sheet, comprises the following steps:
[0030] (1) Weigh 1 g of formic acid nano-lignin with a mass fraction of 0.1%, 0.2 g of glyoxal and 1 g of PHGH, place them in a beaker in turn, heat at 90 °C for 2 h, and use deionized water in a dialysis bag (Mw=8000 ) for 3 days to obtain highly antibacterial modified nano lignin.
[0031] (2) Weigh 10 g of gelatinized cornstarch liquid with a mass fraction of 1%, 0.5 g of chitosan with a mass fraction of 0.25% highly antibacterial modified nano-lignin, add them to a beaker in turn, and place them on a magnetic stirrer Stirring at 90° C. and 400 rpm for 10 min on a mixer to obtain a starch solution in which nanoparticles are uniformly dispersed.
[0032] (3) In order to eliminate the loss of water in (2) due to evaporation, recalculate the starch solid content after weighing, measure the composite solution with a corresponding starch solid content of 0.12 g, and use a sizing r...
Embodiment 3
[0035] A kind of preparation method of starch sizing paper sheet, comprises the following steps:
[0036] (1) Weigh 1g of formic acid nano-lignin with a mass fraction of 0.1%, 0.2g of glyoxal and 1g of PHGH, put them in a beaker in turn, heat at 90°C for 2h, use deionized water in a dialysis bag (Mw=8000) Dialyzed in medium for 3 days to obtain highly antibacterial modified nano lignin.
[0037] (2) Weigh 10g of gelatinized cornstarch liquid with a mass fraction of 1%, 0.5g of chitosan with a mass fraction of 0.5% highly antibacterial modified nano-lignin, add them to a beaker in turn, and place them on a magnetic stirrer Stirring at 90°C and 400 rpm for 10 min on a mixer to obtain a starch solution with uniformly dispersed nanoparticles.
[0038] (3) In order to eliminate the loss due to water evaporation in (2), recalculate the starch solid content after weighing, and the quantitative value corresponding to a petri dish with a diameter of 7cm is 60g / m 2 The volume of the s...
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