Preparation method of nano epoxy resin composite material

[0028] Example 1:

[0029] A preparation method of epoxy resin nanocomposite material, which comprises the following steps:

[0030] 1) Pretreatment of raw materials: Liquid epoxy resin E51 (epoxy value between 0.48~0.52mol / 100g) is vacuum dried at 50℃ to remove water (vacuum degree is -0.1MPa), vacuum drying time for water removal 120min, until the liquid epoxy resin becomes clear and no bubbles emerge;

[0031] Diethylenetriamine (curing agent) is purified by vacuum distillation before use (collecting the fraction at 85-90°C under a vacuum of -0.098MPa) to make the curing agent purity ≥95wt%;

[0032] 2) Extraction of starch nanocrystals by the action of sulfuric acid solution: press H 2 SO 4 The ratio of solution, pea starch, and deionized water is 250mL: 36.00g: 100mL, and 3.16mol / L H is selected 2 SO 4 Solution, pea starch and deionized water, spare;

[0033] Add pea starch to 3.16mol / L H 2 SO 4 The solution container; place the container in an oil bath at 40°C and mechanically

[0040] Example 2:

[0041] A preparation method of epoxy resin nanocomposite material, which comprises the following steps:

[0042] 1) Pretreatment of raw materials: Bisphenol A epoxy resin E51 is vacuum dried at 100°C to remove water (vacuum degree is -0.1MPa), and the vacuum drying time is 180min until the liquid epoxy resin becomes clear And no bubbles come out;

[0043] Diethylenetriamine (curing agent) is purified by vacuum distillation before use (collecting the fractions around 85-90°C under a vacuum of -0.098MPa) to make the curing agent purity ≥95wt%; the curing agent can be diethylenetriamine Any of aliphatic polyamines such as amine, triethylenetetramine, tetraethylenepentamine, or diethylaminopropylamine.

[0044] 2) First prepare 250mL 3.16mol / L H 2 SO 4 The solution, when the temperature of the sulfuric acid solution drops to room temperature, transfer it to a 500 mL round bottom flask. Weigh 36.00g of dry pea starch raw material, add it to the above mentioned 3.16mol

[0048] Example 3:

[0049] As in Example 1, the mass ratio of epoxy resin E51:starch nanocrystals in the third step {ie step 3)} was changed to 100:1.5, and the oil bath temperature, stirring rate, stirring time and ultrasonic time were changed to 60°C. , 800rpm, 50min and 30min; the stirring time and vacuum degassing time of the fourth step were changed to 10min and 10min respectively; the degassing time of the fifth step was changed to 10min, curing at room temperature for 3d, and curing at 90℃ for 8h.