A kind of preparation method of konjac flour-chitosan-pva blend adhesive
A technology of chitosan and konjac flour, applied in the field of polymer chemistry, can solve the problems of insufficient bonding strength and restricting development, and achieve the effects of easy large-scale production, low production cost and low pollution
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Embodiment 1
[0017] A kind of preparation method of konjac flour-chitosan-PVA blend adhesive comprises the following steps:
[0018] (1) Prepare a PVA solution with a mass fraction of 10%: Swell PVA and pure water at room temperature for 5 minutes at a mass ratio of 1:9, then raise the temperature of the swollen solution to 90°C and keep it at a constant temperature for 20 minutes to completely dissolve it. The temperature is lowered to 25°C for sealing, that is, a PVA solution with a mass fraction of 10% is made; wherein, the selected PVA has a degree of polymerization ≥ 1700 and a degree of alcoholysis of 97%.
[0019] (2) add 40 parts of konjac flour and 300 parts of deionized water in the container, be warming up to 65 DEG C, be stirred under the stirring condition of 200r / min at the rotating speed and become konjac solution, add 40 parts of chitosan in the konjac solution, Stir continuously to dissolve or fully swell the chitosan, adjust the pH value to 4, add 2 parts by weight of an ...
Embodiment 2
[0022] A kind of preparation method of konjac flour-chitosan-PVA blend adhesive comprises the following steps:
[0023] (1) Prepare a PVA solution with a mass fraction of 10%: Swell PVA and pure water at room temperature for 10 minutes at a mass ratio of 1:9, then raise the temperature of the swollen solution to 90°C and keep it at a constant temperature for 30 minutes to completely dissolve it. Cool down to 25°C for sealing, that is, make a PVA solution with a mass fraction of 10%; wherein, the selected PVA has a degree of polymerization ≥ 1700 and a degree of alcoholysis of 97%;
[0024] (2) add 60 parts of konjac powder and 200 parts of deionized water in the container, be warming up to 75 ℃, be stirred under the stirring condition of 220r / min at the rotating speed and become konjac solution, add 60 parts of chitosan in the konjac solution, Stir continuously to dissolve or fully swell the chitosan, adjust the pH value to 6, add 3 parts by weight of an initiator and stir for...
Embodiment 3
[0027] A kind of preparation method of konjac flour-chitosan-PVA blend adhesive comprises the following steps:
[0028] (1) Prepare a PVA solution with a mass fraction of 10%: Swell PVA and pure water at room temperature for 8 minutes at a mass ratio of 1:9, then raise the temperature of the swollen solution to 90°C and keep it at a constant temperature for 25 minutes to completely dissolve it. The temperature is lowered to 25°C for sealing, that is, a PVA solution with a mass fraction of 10% is made; wherein, the selected PVA has a degree of polymerization ≥ 1700 and a degree of alcoholysis of 97%.
[0029] (2) add 50 parts of konjac flour and 250 parts of deionized water in the container, be warming up to 70 ℃, be stirred under the stirring condition of 210r / min at the rotating speed and become konjac solution, add 50 parts of chitosan in the konjac solution, Stir continuously to dissolve or fully swell chitosan, adjust the pH value to 5, add 2-3 parts by weight of an initia...
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