A kind of aldehyde-free protein adhesive and preparation method thereof
A technology of protein glue and aldehyde protein, which is applied in the field of aldehyde-free protein adhesive and its preparation, can solve the problem of uneven distribution of cross-linked structure of protein adhesive, formaldehyde release of glued wood-based panels, and inability to use outdoor wood-based panels, etc. problem, to achieve the effect of increasing the type and quantity, decreasing the weak interface layer, and improving the performance of the adhesive
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Embodiment 1
[0040] An aldehyde-free protein adhesive consisting of the following materials by weight:
[0041] Demineralized water 70 kg;
[0042] Defatted soybean meal protein powder 30 kg;
[0043] Trypsin 0.2kg;
[0044] Ficin 0.2kg;
[0045] Sodium periodate 2kg;
[0046] Triethylenetetramine 0.2kg;
[0047] Ethylene glycol diglycidyl ether 0.5kg.
[0048] When the formaldehyde-free protein adhesive in this embodiment is used: mix the formaldehyde-free protein adhesive, water, methylol, isocyanate, epoxy, and polyurethane cross-linking agent, and stir at room temperature for 10 minutes. Stir well.
Embodiment 2
[0050] An aldehyde-free protein adhesive consisting of the following materials by weight:
[0051] Demineralized water 70 kg;
[0052] Defatted soybean meal protein powder 30 kg;
[0053]Trypsin 0.5kg;
[0054] Ficin 0.5kg;
[0055] Sodium periodate 5kg;
[0056] Triethylenetetramine 0.5kg;
[0057] Ethylene glycol diglycidyl ether 1kg.
Embodiment 3
[0059] A preparation method of aldehyde-free protein adhesive, comprising the following steps:
[0060] (1) According to the weight ratio in the above-mentioned formaldehyde-free protein adhesive, weigh each component and prepare raw materials;
[0061] (2) Evenly disperse the defatted soybean meal protein powder, water and trypsin in the dispersion medium water, raise the temperature of the water bath to 40°C, and stir for 30 minutes. When the temperature rises to 80°C, keep warm for 10 minutes and then inactivate the enzyme;
[0062] (3) Cool down the mixture obtained in step 2 to 40°C, add ficin, keep it warm for 15 minutes, and heat up to 80°C to inactivate the enzyme;
[0063] (4) Add sodium periodate to the mixture obtained in step 3, raise the temperature to 50°C, adjust the pH value to 4.0, add triethylenetetramine after reacting for 5 hours, react at 50°C for 2 hours, then raise the temperature to 90°C, and react 6 Hour;
[0064] (5) Heat the mixture in step 4 to 90...
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