Starch-based composite seed coating agent and preparation method thereof
A starch-based and starch technology, applied in the agricultural field, can solve the problems of poor film-forming property, difficult to meet the requirements of film-forming property and cohesiveness at the same time, easy to dissolve and run off, etc. Good adhesion and film-forming properties
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Embodiment 1
[0031] (1) The composition of the active ingredient layer (inner layer) is as follows: 40g of carboxymethyl starch with a degree of substitution of 0.6 is pregelatinized in a drum dryer, 1.1g of root powder and aspirin are mixed at a mass ratio of 5:6, Thiram 4g, Carbofuran 4g, KNO 3 : NH 4 NO 3 : KH 2 PO 4 :MgSO 4 Take 12g after mixing according to the mass ratio of 5:5:8:1, and mix the above ingredients evenly.
[0032] (2) Film-forming water-retaining layer (outer layer):
[0033] A. Preparation of grafted starch:
[0034] a) Under stirring, add starch to a certain amount of deionized water to form starch milk with a concentration of 25% by mass.
[0035] b) Raise the temperature to 85°C and fully gelatinize for 30 minutes.
[0036] c) Lower the temperature to 70°C, add acrylic acid and acrylamide-2-methylpropanesulfonic acid in a mass ratio of 1:0.8 as a comonomer, the mass ratio of the total amount of monomers to starch is 3:1, and the added mass is Cross-linkin...
Embodiment 2
[0041](1) The composition of the active ingredient layer (inner layer) is as follows: Carboxymethyl starch with a substitution degree of 1.0 is pregelatinized in a drum dryer, and then 20 g of hydroxypropyl starch with a substitution degree of 0.5 is pregelatinized in a drum dryer. After taking 10g, rooting powder and aspirin are mixed according to the mass ratio of 5:6 and then taking 1.5g, thiophanate-methyl 4.2g, butylthiocarbofuran 4.5g, KNO 3 : NH 4 NO 3 : KH 2 PO 4 :MgSO 4 Take 10g after mixing according to the mass ratio of 5:5:8:1, and mix the above ingredients evenly.
[0042] (2) Film-forming water-retaining layer (outer layer):
[0043] A. Preparation of grafted starch:
[0044] a) Under stirring, add starch to a certain amount of deionized water to form starch milk with a concentration of 25% by mass.
[0045] b) Raise the temperature to 80°C and fully gelatinize for 25 minutes.
[0046] c) Lower the temperature to 73°C, add a comonomer of acrylic acid and ...
Embodiment 3
[0051] (1) The composition of the active ingredient layer (inner layer) is as follows: take 15 g of carboxymethyl starch after pregelatinization in a drum dryer, 5 g of hydroxyethyl starch with a degree of substitution of 0.4 after pregelatinization in a drum dryer, and root powder Take 1.8g after mixing with aspirin at a mass ratio of 5:6, mix thiram and triadimefon at a mass ratio of 1:1 to take 4.5g, 5.0g of carbofuran, KNO 3 : NH 4 NO 3 : KH 2 PO 4 :MgSO 4 Take 5g after mixing according to the mass ratio of 5:5:8:1, and mix the above ingredients evenly.
[0052] (2) Film-forming water-retaining layer (outer layer):
[0053] A. Preparation of grafted starch:
[0054] a) Under stirring, add starch to a certain amount of deionized water to form starch milk with a concentration of 20% by mass.
[0055] b) Raise the temperature to 90°C and fully gelatinize for 35 minutes.
[0056] c) Lower the temperature to 71°C, add comonomers that are methacrylic acid and acrylamide ...
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