Compound coated slow-release fertilizer for garden planting and method for preparing compound coated slow-release fertilizer

A coated slow-release, gardening technology, applied in urea compound fertilizers, layered/coated fertilizers, applications, etc., can solve the problems of unsatisfactory slow-release and water resistance, and achieve excellent fertilizer effect slow-release and waterproof performance, The effect of improved sustained release performance and strong adhesion

Inactive Publication Date: 2017-02-01
天长市天兴园林绿化工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The slow release and water resistance of the coated fertilizer for garden crop planting in the prior art cannot meet the needs in the actual planting process, so it is urgent to develop a composite coated slow release fertilizer for garden planting to meet the requirements of garden crop fertilization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The present invention proposes a composite coated slow-release fertilizer for garden planting, which consists of a core fertilizer, an inner coating material wrapped on the surface of the core fertilizer and an outer layer wrapped on the surface of the inner coating material The composition of the coating material;

[0020] The mass ratio of the core fertilizer, the inner coating material and the outer coating material is 100:4:8;

[0021] The core fertilizer is made by mixing urea, diamine phosphate, potassium sulfate and peat in a weight ratio of 30:9:6:18; the particle size of the core fertilizer is 6.5mm;

[0022] The inner coating material is prepared according to the following process: 30 parts of cornstarch and 9 parts of water are mixed evenly by weight, then 10 parts of hydrogen peroxide and 4 parts of sodium hydroxide A solution with a mass fraction of 20% are added, and the pH is adjusted to 9.5, then heat up to 50°C, keep warm for 2h, then add 3 parts of so...

Embodiment 2

[0026] The present invention proposes a composite coated slow-release fertilizer for garden planting, which consists of a core fertilizer, an inner coating material wrapped on the surface of the core fertilizer and an outer layer wrapped on the surface of the inner coating material The composition of the coating material;

[0027] The mass ratio of the core fertilizer, the inner coating material and the outer coating material is 100:3:12;

[0028] The core fertilizer is made by mixing urea, diamine phosphate, potassium sulfate and peat in a weight ratio of 20:12:3:24; the particle size of the core fertilizer is 5mm;

[0029] The inner coating material is prepared according to the following process: mix 20 parts of cornstarch and 12 parts of water by weight, then add 5 parts of hydrogen peroxide and 5 parts of sodium hydroxide A solution with a mass fraction of 18%, and adjust the pH to 10, then heat up to 48°C, keep warm for 3h, then add 2 parts of sodium bisulfite solution w...

Embodiment 3

[0033] The present invention proposes a composite coated slow-release fertilizer for garden planting, which consists of a core fertilizer, an inner coating material wrapped on the surface of the core fertilizer and an outer layer wrapped on the surface of the inner coating material The composition of the coating material;

[0034] The mass ratio of the core fertilizer, the inner coating material and the outer coating material is 100:5:4;

[0035] The core fertilizer is made by mixing urea, diamine phosphate, potassium sulfate and peat in a weight ratio of 40:6:9:12; the particle size of the core fertilizer is 8mm;

[0036] The inner coating material is prepared according to the following process: 40 parts of cornstarch and 6 parts of water are mixed uniformly by weight, then 15 parts of hydrogen peroxide and 3 parts of sodium hydroxide A solution with a mass fraction of 22% are added, and the pH is adjusted to 9. Then heat up to 52°C, keep warm for 1h, then add 4 parts of sod...

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Abstract

The invention discloses a compound coated slow-release fertilizer for garden planting. The compound coated slow-release fertilizer comprises kernel fertilizers, inner-layer coating materials and outer-layer coating materials. The inner-layer coating materials wrap the surfaces of the kernel fertilizers, and the outer-layer coating materials wrap the surfaces of the inner-layer coating materials; urea, diammonium phosphate, potassium sulfate and grass carbon are mixed with one another to obtain the kernel fertilizers; a process for preparing the inner-layer coating materials include uniformly mixing corn starch and water with each other to obtain first mixtures, adding hydrogen peroxide and sodium hydroxide solution A into the first mixtures to obtain second mixtures, heating the second mixtures, then preserving heat of the second mixtures, adding sodium bisulfite solution into the second mixtures to obtain third mixtures, cooling the third mixtures, adding epichlorohydrin into the third mixtures to obtain fourth mixtures, dropwise adding sodium hydroxide solution B into the fourth mixtures to obtain fifth mixtures, carrying out constant-temperature reaction on the fifth mixtures and cooling reaction products until the temperatures of the reaction products reach the room temperature to obtain the inner-layer coating materials. The invention further discloses a method for preparing the compound coated slow-release fertilizer for garden planting. The compound coated slow-release fertilizer and the method have the advantages that the slow-release fertilizer prepared by the aid of the method is excellent in fertilizer efficiency slow-release and waterproof property, free of biological toxicity, good in film-forming ability and high in cohesiveness, and growth of garden crops can be promoted.

Description

technical field [0001] The invention relates to the field of fertilizers, in particular to a composite coated slow-release fertilizer for garden planting and a preparation method thereof. Background technique [0002] Coated fertilizers use granular fertilizers as the core, and coat a layer of inorganic or organic polymers on the surface of the fertilizer to reduce the dissolution rate of the fertilizer, prolong the nutrient release time, and coordinate the nutrient release with the law of crop fertilizer requirements. fertilizer. After the coated fertilizer is applied to the soil, the coating layer can effectively control the dissolution process of soil moisture and the nutrients of the coated fertilizer, and control the diffusion rate of nutrients through the membrane, so as to achieve the efficiency of delaying the nutrient supply time. The application of coated fertilizers in agricultural production can not only adjust the availability of nutrients in the plant-soil sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
CPCC05B7/00C05G5/30C05C9/00C05D1/02C05F11/00C05F11/02
Inventor 叶金华王兴忠张明磊刘明梅叶长清胡培培叶长梅倪从山王德江陶素山刘明华黄元季
Owner 天长市天兴园林绿化工程有限公司
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