Preparation method of high-stability starch adhesive
A starch adhesive, high stability technology, applied in the direction of starch adhesives, adhesive additives, polymer adhesive additives, etc., can solve the problems that the stability cannot meet the demand, the toughness is poor and easy to break, etc. Good moisturizing effect, fast drying, no irritating smell effect
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Embodiment 1
[0014] A method for preparing a high-stability starch adhesive, comprising the following steps: mixing 60kg of cornstarch and 160kg of water, raising the temperature to 70°C and stirring for 20 minutes, adding 2kg of borax and 0.5kg of copper sulfate and continuing to stir for 2 hours, and then adding 9kg of bentonite for compounding Mix the mixture evenly, adjust the pH value of the system to 10.2-10.8 with a concentration of 0.6mol / L sodium hydroxide solution, add 4kg of phthalic anhydride and stir for 10min, add 4kg of sodium dehydroacetate and mix evenly, gelatinize, and the gelatinization temperature is 80°C to obtain a high-stability starch adhesive.
[0015] The bentonite compound is prepared by the following process: mix 12kg bentonite and 25kg disproportionated rosin evenly, add 4kg bisphenol A and stir evenly under stirring, add 0.2kg triethylamine, heat up to 180°C and stir for 20min, cool to 105°C, add 8kg of phenol was stirred for 35min to obtain a bentonite compo...
Embodiment 2
[0017] A method for preparing a high-stability starch adhesive, comprising the following steps: mixing 80kg of cornstarch and 100kg of water, raising the temperature to 80°C and stirring for 10 minutes, adding 4kg of borax and 0.3kg of copper sulfate and continuing to stir for 3 hours, and then adding 5kg of bentonite for compounding Mix the mixture evenly, adjust the pH value of the system to 10.2-10.8 with a concentration of 1mol / L sodium hydroxide solution, add 2kg of phthalic anhydride and stir for 20min, add 2kg of sodium dehydroacetate and mix evenly, gelatinize, and the gelatinization temperature is 90 °C, high stability starch adhesive was obtained.
[0018] The bentonite compound is prepared by the following process: mix 6kg bentonite and 35kg disproportionated rosin evenly, add 2kg bisphenol A and stir evenly under stirring, add 0.4kg triethylamine, heat up to 160°C and stir for 40min, cool to 95°C, add 16kg of phenol was stirred for 25 minutes to obtain a bentonite ...
Embodiment 3
[0020] A method for preparing a high-stability starch adhesive, comprising the following steps: mixing 65kg of cornstarch and 140kg of water, raising the temperature to 73°C and stirring for 18 minutes, adding 2.5kg of borax and 0.45kg of copper sulfate to continue stirring for 2.2 hours, and then adding 8kg of Mix the bentonite compound evenly, adjust the pH value of the system to 10.2-10.8 with a 0.7mol / L sodium hydroxide solution, add 3.5kg of phthalic anhydride and stir for 12 minutes, add 3.5kg of sodium dehydroacetate, mix evenly, and gelatinize. The gelatinization temperature was 82°C, and a high-stability starch adhesive was obtained.
[0021] The bentonite compound is prepared by the following process: mix 10kg of bentonite and 28kg of disproportionated rosin, add 3.5kg of bisphenol A and stir evenly under stirring, add 0.25kg of triethylamine, heat up to 166°C and stir for 25min, cool to 102°C, Add 10kg of phenol and stir for 32min to obtain bentonite composite.
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