Masking tape glue and preparation method thereof
A technology of masking paper and tape, applied in the direction of adhesives, sustainable manufacturing/processing, adhesive types, etc., can solve problems such as poor waterproofness, achieve the effects of increased bonding strength, firm connection, and improved mixing uniformity
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preparation example 1
[0037] The preparation method of oxidized starch comprises the steps:
[0038] 1), in the water of 37.5 ℃ of 1000ml, add the potato starch that accounts for 50% by weight of water, then stir 40min, then add the ferrous sulfate that accounts for 0.125% by weight of water, continue to stir for 15min, make starch milk:
[0039] 2), continuously dropwise add a sodium hydroxide solution with a mass fraction of 10% into the starch milk, and keep stirring until the pH value of the starch milk is 7.5;
[0040]3), add 500ml of mass fraction 25% hydrogen peroxide solution to the starch milk in step 2), stir for 35min, then continue to add mass fraction of 10% sodium hydroxide solution, and keep stirring until the starch The pH of the milk is 9.5.
preparation example 2
[0042] The preparation method of oxidized starch comprises the steps:
[0043] 1), in 1000ml of water at 30°C, add potato starch that accounts for 40% by weight of water, then stir for 30 minutes, then add ferrous sulfate that accounts for 0.1% by weight of water, and continue stirring for 10 minutes to obtain starch milk:
[0044] 2), continuously dropwise add a sodium hydroxide solution with a mass fraction of 8% into the starch milk, and keep stirring until the pH value of the starch milk is 7;
[0045] 3), add 500ml of mass fraction 20% hydrogen peroxide solution to the starch milk in step 2), stir for 30min, then continue to add mass fraction of 8% sodium hydroxide solution, and keep stirring until the starch Milk has a pH of 9.
preparation example 3
[0047] The preparation method of oxidized starch comprises the steps:
[0048] 1), in 1000ml of water at 45°C, add potato starch that accounts for 60% by weight of water, then stir for 50 minutes, then add ferrous sulfate that accounts for 0.15% by weight of water, and continue stirring for 20 minutes to obtain starch milk:
[0049] 2), continuously dropwise add a sodium hydroxide solution with a mass fraction of 12% into the starch milk, and keep stirring until the pH value of the starch milk is 8;
[0050] 3), add 500ml of mass fraction 30% hydrogen peroxide solution to the starch milk in step 2), stir for 40min, then continue to add mass fraction of 12% sodium hydroxide solution, and keep stirring until the starch The pH of the milk is 10.
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