Preparation method for degradable white cardboard applied to food packaging
A technology for food packaging and white cardboard, applied in the field of papermaking, can solve the problems of the white cardboard being difficult to degrade, unfavorable to human health, difficult to recycle, etc., and achieves the effects of good degradation performance, enhanced surface strength, and improved bending resistance.
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example 1
[0026]Soak 300g of corn in 400mL of sulfurous acid solution with a mass fraction of 0.8% for 6 hours, take out the soaked corn, and crush the corn in a disc crusher for 1 hour to obtain corn paste, pass the corn paste through a sieve with a diameter of 0.06 After centrifugal sieving of mm, the sieved corn paste was obtained, heated in an oven to 80°C, and dried for 4 hours to obtain coarse cornstarch; the coarse cornstarch was placed in a rake-type vacuum dryer, heated to 100°C, and vacuum Dry for 2 hours to obtain dry cornstarch, mix dry cornstarch, glycerin and water at a mass ratio of 10:5:1, place in a high-speed disperser and disperse at a speed of 3000r / min for 10min to obtain a dispersed starch material; put coniferous wood into The wood pulverizer was crushed for 30 minutes, passed through a 80-mesh standard sieve to obtain sieved wood powder, put the sieved wood powder in an oven at a temperature of 100°C and dried for 3 hours, and prepared a 20% mass fraction of Put ...
example 2
[0028] Soak 325g of corn in 450mL of sulfurous acid solution with a mass fraction of 0.8% for 7 hours, take out the soaked corn, put the corn in a disc crusher and crush it for 1.5 hours to obtain corn paste, pass the corn paste through a sieve with a diameter of After a 0.07mm centrifugal sieve, the sieved corn paste was obtained, heated in an oven to 83°C, and dried for 4.5 hours to obtain coarse cornstarch; put the coarse cornstarch in a rake-type vacuum dryer, and heated to 103°C , dried in vacuum for 2.5h to obtain dry cornstarch, mixed dry cornstarch, glycerol and water in a mass ratio of 10:5:1, placed in a high-speed disperser and dispersed for 13min at a speed of 3250r / min to obtain a dispersed starch material; Put the leaf wood into a wood crusher for 35 minutes, pass through an 80-mesh standard sieve to obtain sieved wood powder, put the sieved wood powder into an oven at a temperature of 110°C and dry for 4 hours, and use the dried sieved wood powder to prepare a ma...
example 3
[0030] Soak 350 g of corn in 500 mL of sulfurous acid solution with a mass fraction of 0.8% for 8 hours, take out the soaked corn, and crush the corn in a disc crusher for 2 hours to obtain corn paste, pass the corn paste through a sieve with a diameter of 0.08 After centrifugal sieving of mm, the sieved corn paste was obtained, heated in an oven to 85°C, and dried for 5 hours to obtain coarse cornstarch; the coarse cornstarch was placed in a rake-type vacuum dryer, heated to 105°C, and vacuum Dry for 3 hours to obtain dry cornstarch, mix dry cornstarch, glycerin and water in a mass ratio of 10:5:1, place in a high-speed disperser and disperse at a speed of 3500r / min for 15min to obtain a dispersed starch material; put coniferous wood into The wood pulverizer was crushed for 50 minutes, passed through an 80-mesh standard sieve to obtain sieved wood powder, and the sieved wood powder was put into an oven at a temperature of 120°C to dry for 5 hours, and the dried sieved wood pow...
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