Starch modified phenolic resin and application thereof
A phenolic resin and starch modification technology, applied in the application of starch-modified phenolic resin, starch-modified phenolic resin, and adhesive field, to achieve the effect of improving workability, improving adhesion and high impact strength
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Embodiment 1
[0026] (a) Preparation of modified starch prepolymer: prepare corn starch into a solution, raise the temperature to 45°C, add 1 IU / g β-amylase and 2 IU / g isoamylase, adjust the pH to 4.5-5.5, and perform constant temperature enzymatic hydrolysis 1h, add calcium oxide to adjust the pH to 6.5-8, add 10 IU / g high-temperature amylase, enzymatically hydrolyze at 85°C for 2h, cool down to obtain a modified starch prepolymer;
[0027] (b) Synthesis of phenolic prepolymer: Mix 100 parts of phenol and 260 parts of formaldehyde, add calcium oxide to adjust the pH to 8-10, raise the temperature to 65°C for 1 hour, and obtain a phenolic prepolymer;
[0028] (c) Mix the phenolic prepolymer and the modified starch prepolymer at a ratio of 1:0.2, adjust the pH to 7-9, react at a constant temperature of 60°C for 1h until the viscosity reaches 18mPa·s, cool down to below 60°C, and add formaldehyde Scavenger, until the free aldehyde is less than 1%, that is to say.
Embodiment 2
[0030] (a) Preparation of modified starch prepolymer: prepare starch into a solution, raise the temperature to 60°C, add 3 IU / g β-amylase and 6 IU / g isoamylase, adjust the pH to 4.5-5.5, and perform constant temperature enzymatic hydrolysis for 3 hours , adding calcium oxide to adjust the pH to 7-9, adding 30 IU / g high-temperature amylase, enzymatically hydrolyzing at 100°C for 2 hours, and cooling to obtain a modified starch prepolymer;
[0031] (b) Synthesis of phenolic prepolymer: Mix 100 parts of phenol and 345 parts of formaldehyde, add calcium oxide to adjust the pH to 8-10, raise the temperature to 85°C and react at a constant temperature for 1-4 hours to obtain a phenolic prepolymer;
[0032] (c) Mix the phenolic prepolymer and the modified starch prepolymer at a ratio of 1:1.5, add calcium oxide to adjust the pH to 8.0, react at a constant temperature of 75°C for 3 hours until the viscosity reaches 5-20mPa·s, and cool down to below 60°C , add formaldehyde scavenger un...
Embodiment 3
[0034] (a) Preparation of modified starch prepolymer: Prepare soybean starch into a 30% solution, raise the temperature to 50°C, add 2 IU / g β-amylase and 6 IU / g isoamylase, adjust the pH to 5, and keep the temperature of the enzyme Decompose for 3 hours, adjust the pH to 7-9 with calcium oxide, add 20 IU / g high-temperature amylase, reflux at 100°C for 2 hours, cool down to obtain a modified starch prepolymer;
[0035] (b) Synthesis of phenolic prepolymer: Mix 100 parts of phenol and 320 parts of formaldehyde, adjust the pH to 8.7 with barium hydroxide, and raise the temperature to 80°C for 4 hours to obtain a phenolic prepolymer;
[0036] (c) Mix the phenolic prepolymer and the modified starch prepolymer at a ratio of 1:1.3, add calcium oxide to adjust the pH to 7-9, react at a constant temperature of 75°C for 3h until the viscosity reaches 18mPa·s, then cool down to 60°C, Add 120 parts of urea until the free aldehyde is less than 1%.
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