Paper coating adhesive prepared from excess sludge extract protein and preparation method of paper coating adhesive
A technology of excess sludge and sludge protein, applied in paper coating, coating, papermaking, etc., can solve the problems of difficulty in guaranteeing reaction efficiency and effect, leakage of hydrophobic groups, complex protein components, etc., and achieve coating thermal Good stability, improved solubility, and easy collection
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Embodiment 1
[0036] The excess sludge protein extract is the excess sludge protein extract produced by Tianjin Yuchuan Microbial Products Co., Ltd. It is the excess protein extract obtained by alkali extraction from the excess sludge of urban sewage treatment plants. The protein content is 33%, and the solid content for 42%.
[0037] In the process of alcohol analysis, first heat the sludge protein extract to 70°C, then add 95% ethanol solution equal to the volume of the sludge protein extract, stir for 15 minutes, centrifuge at 3000rpm to separate the precipitate, and take the solid matter to vacuum dry and pulverize at 60°C , to obtain the protein extracted from the remaining sludge. The protein content of the protein extracted from the remaining sludge is 67%.
[0038] Take an appropriate amount of remaining sludge to extract protein, add water to prepare a 15% suspension, stir, adjust the pH value to 8.0 with alkali, then raise the temperature to 70°C, and add chloroacetic acid that i...
Embodiment 2
[0045] The excess sludge protein extract is the excess sludge protein extract produced by Tianjin Yuchuan Microbial Products Co., Ltd. It is the excess protein extract obtained by alkaline extraction of excess sludge from urban sewage treatment plants. The protein content is 35%, and the solid content is 35%. 45%.
[0046] In the alcohol precipitation process, firstly, the sludge protein extract is heated to 65°C, and then 95% ethanol solution with 1.2 times the volume of the sludge protein extract is added, stirred for 15 minutes, centrifuged at 3000rpm to separate the precipitate, and the solid matter is vacuum-dried at 60°C. Pulverize to obtain the protein extracted from the remaining sludge. The protein content of the protein extracted from the remaining sludge is 65%.
[0047] Take an appropriate amount of remaining sludge to extract protein, add water to make a 12% suspension, stir, adjust the pH value to 7.5 with alkali, then raise the temperature to 65°C, add chloroac...
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