Modified starch for environment-friendly starch-based wallpaper glue and preparation method thereof
A modified starch and starch-based technology, applied in the field of modified starch, can solve the problems of incapable of industrial application, cumbersome and complicated, and poor feasibility, and achieve the effects of avoiding high recycling costs, improving reaction yield, and reducing pollution and health hazards.
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Embodiment 1
[0034] Modified starch for environment-friendly starch-based wallpaper glue, the composition of raw materials by weight is as follows:
[0035] 100 parts of raw starch, 10 parts of edible alkali tablets, 50 parts of propylene oxide, 45 parts of 2wt% soda ash solution, 30 parts of common salt, 0.01 part of epichlorohydrin, and 300 parts of water.
[0036] The original starch is potato starch.
[0037] The preparation steps are as follows:
[0038] 1) Fully dissolve salt and edible alkali tablets in water, stir for 30 minutes, then add raw starch to make starch slurry and activate for 30 minutes;
[0039] 2) adding 2% soda ash solution to adjust the pH of the starch slurry to 10.8-11, and then adding propylene oxide and epichlorohydrin;
[0040] 3) After reacting at 32°C for 16 hours, adjust the pH to 6-7.5 with 5% hydrochloric acid;
[0041] 4) Post-processing: 8-stage cyclone washer for countercurrent washing to remove various chemical substances and impurities; after washi...
Embodiment 2
[0050] Modified starch for environment-friendly starch-based wallpaper glue, the composition of raw materials by weight is as follows:
[0051] 100 parts of waxy corn starch, 5 parts of edible alkali tablets, 50 parts of propylene oxide, 40 parts of 3% soda ash solution, 25 parts of common salt, 0.02 parts of epichlorohydrin, and 350 parts of water.
[0052] The preparation steps are as follows:
[0053] 1) Fully dissolve salt and edible alkali tablets in water, add raw starch to make starch slurry and activate for 50 minutes;
[0054] 2) adding 3% soda ash solution to adjust the pH of the starch slurry to 11.2, and then adding propylene oxide and epichlorohydrin;
[0055] 3) After reacting at 35° C. for 20 hours, adjust the pH to 6-7.5, and then post-process to obtain the environment-friendly modified starch for starch-based wallpaper glue.
[0056] Modified starch properties are as follows:
[0057] Detection Indicator The measurement results 10% viscosity...
Embodiment 3
[0062] Modified starch for environment-friendly starch-based wallpaper glue, the composition of raw materials by weight is as follows:
[0063]100 parts of rice starch, 3 parts of edible alkali tablets, 40 parts of propylene oxide, 45 parts of 2% soda ash solution, 15 parts of common salt, 0.01 part of epichlorohydrin, and 320 parts of water.
[0064] The preparation steps are as follows:
[0065] 1) Fully dissolve salt and edible alkali tablets in water, add raw starch to make starch slurry and activate for 40 minutes;
[0066] 2) adding 2% soda ash solution to adjust the pH of the starch slurry to 10.8, and then adding propylene oxide and epichlorohydrin;
[0067] 3) After reacting at 33° C. for 16 hours, adjust the pH to 6-7.5, and then post-process to obtain the environment-friendly modified starch for starch-based wallpaper glue.
[0068] Modified starch properties are as follows:
[0069] Detection Indicator The measurement results 10% viscosity (50°C)...
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