A kind of synthetic method of chitosan analog and its application as green glue
An analog, amino chitosan technology, applied in the direction of polysaccharide adhesives, adhesives, adhesive types, etc., can solve problems such as harming human health, and achieve the effects of low cost, good water solubility, and a wide range of sources
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Embodiment 1
[0040] ammonium starch sulfate (NH 4 CS) as the substrate, the starch ammonium sulfate aqueous solution is placed in the autoclave and feeds NH 3 , control the pressure in the kettle to be 0.9MPa, the temperature to be 50°C, and react for 5h to obtain the target product which can be used directly. For analysis and structural identification, the reaction mixture can be further put into a dialysis bag with a molecular weight cut-off of 8000, and dialyzed in deionized water for three days, during which the deionized water is replaced 5 to 8 times to remove inorganic salts, and the purified 6 - Amino chitosan (6-NH 2 CTS). Carry out substitution degree analysis to it as shown in table 3:
[0041] Table 3 product substitution degree
[0042]
Embodiment 2
[0044] Will NH 4 CS and 6-NH 2CTS were formulated into 10.0%-75.0% aqueous solutions respectively, and the dynamic viscosity values of the two aqueous solutions at different concentrations were tested with a digital display viscometer DV-C according to the order of concentration from low to high. Select a suitable rotor, set the rotation speed of the rotor to 100rpm, use a constant temperature water tank to control the temperature of the aqueous solution at 25°C, and record the different concentrations of NH 4 CS and 6-NH 2 The viscosity values of the CTS aqueous solution are shown in Table 4 and Table 5:
[0045] The viscosity of table 4 different starch ammonium sulfate aqueous solution concentrations
[0046]
[0047] The viscosity of table 5 different 6-amino class chitosan aqueous solution concentrations
[0048]
[0049]
[0050] Specific comparison such as Image 6 As shown, with the increase of concentration, NH 4 CS and 6-NH 2 The viscosity of CTS ...
Embodiment 3
[0052] Get 6-NH in embodiment 1 2 CTS product, formulated as 6-NH with a mass concentration of 10% 2 For CTS solution, the pH of the solution was adjusted to 4, 5, 6, 7, and 8 by adding acid. According to the national standard GB / T17657-1999, test its viscoseness respectively, use wooden boards as the test material, and the amount of glue applied is the difference in weight of the boards before and after bonding. See Table 6 for specific data.
[0053] When table 6 is different pH, 6-amino chitosan is to the tensile shear strength of plank
[0054]
[0055] It can be seen from the data in Table 6 that the tensile shear strength is the highest at pH=6.
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