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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

Inactive Publication Date: 2015-04-22
甘肃圣大方舟马铃薯变性淀粉有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this invention is to provide a kind of starch-based composite seed coating agent, to solve the problem that common starch is applied to film-forming agent, and there is poor film-forming property and easy dissolution and loss; It is difficult to meet the requirements of film formation and adhesion at the same time when using a certain polymer film former

Method used

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  • Starch-based composite seed coating agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a starch-based composite seed coating agent and a preparation method thereof and aims to solve the problems that common starch is poor in film formation property and easily lost through dissolution when being applied to a film forming agent; the requirements on the film formation property and the cohesiveness cannot be satisfied simultaneously when certain high-molecular film forming substance is used independently. The composite seed coating agent is divided into an inner layer and an outer layer, wherein the inner layer takes etherified starch as a base material, contains a bactericide, an insecticide, a plant growth inhibitor, a fertilizer and the like, and can be used for preventing diseases and insect pests of seeds to a certain extent; the outer layer takes the starch base a substrate; graft copolymerization of an acrylic acid monomer is triggered by free radicals to prepare a film layer and a water retaining layer; the film layer and the water retaining layer are good in cohesiveness and film formation property, can be used for protecting components of the inner layer from loss and also have water retention property and moisture retention property, so that the germination rate and planting percent of the seeds are increased. The starch-based composite seed coating agent disclosed by the invention is broad-spectrum and suitable for seed coatings of crops such as vegetables, flowers and grains.

Description

technical field [0001] The invention belongs to the field of agriculture, and in particular relates to a seed coating agent and a preparation method thereof. Background technique [0002] Seed coating refers to a "coat" that covers the outside of the seed with a layer of water-containing medicament and growth-promoting substances. Seed coating agents are different from previous seed soaking and seed dressing agents. Seed soaking and chemical seed dressing, the chemical on the surface of the seed will dissolve in water after sowing into the soil, and the drug effect will decrease or disappear soon. The seed coating agent can immediately form a solidified film on the seeds. After the seeds are put into the soil, they will swell with water and the seed coating will not be dissolved. With the germination, germination, emergence and growth of the seeds, the active ingredients on the seed coating will be gradually released. , and is absorbed by the root system to conduct various...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/02C05G3/60
CPCC05B7/00C05G3/00C05G3/60C05G5/30C05G5/37C05C1/00C05C5/02C05D5/00
Inventor 田映良马青斌郑旺斌徐小兰崔芸
Owner 甘肃圣大方舟马铃薯变性淀粉有限公司
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