Preparation method of biodegradable coating material

A coating material and film-forming liquid technology, applied in the direction of fertilizer mixture, application, fertilization equipment, etc., can solve the problem of high price of coated slow-release fertilizers, and achieve the effects of excellent degradation performance, wide sources, and low cost

Inactive Publication Date: 2014-12-10
HEILONGJIANG HEIKE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing a degradable coating material in order to solve the technical problem that the price of the existing coated slow-release fertilizer is relatively high

Method used

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  • Preparation method of biodegradable coating material

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specific Embodiment approach 1

[0015] Specific Embodiment 1: The preparation method of the degradable coating material in this embodiment is as follows: 1. Mix cornstarch and reinforcing agent, then add 125mL of distilled water, add waterproofing agent and plasticizer, and then put it in a water bath at 90°C to 95°C Stir for 30 minutes to mix evenly, add ammonia water and ethyl silicate dropwise, and mix and stir for 25-30 minutes to obtain a film-forming liquid;

[0016] The consumption of said plasticizer is 73%~75% of the quality of cornstarch, the consumption of waterproofing agent is 18%~20% of the quality of cornstarch, the consumption of ammonia water and ethyl silicate is respectively 0.1%~20% of the quality of cornstarch. 0.3%.

[0017] 2. Cast the film-forming solution on a polytetrafluoroethylene glass plate at room temperature, dry it at 35-40°C, peel off the film, and store the film in a desiccator to obtain a degradable coating material.

[0018] The cornstarch used in step one of the present...

specific Embodiment approach 2

[0021] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the reinforcing agent described in step 1 is composed of polyvinyl alcohol and sodium carboxymethyl cellulose in a mass ratio of 9:1. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0022] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the preparation method of the waterproofing agent described in step one is as follows: 50mL water is heated to boiling, and potassium hydroxide 2.25g is added, and the temperature of the solution is Drop to 70°C, add 2g of stearic acid, add 2.25g of triethanolamine when the temperature of the solution drops to 50°C, stir evenly, let stand for 1h, when the temperature of the solution drops to 30°C, add 0.5g of citric acid, let stand for 3h, wait The temperature of the solution is lowered to room temperature, and the pH value is adjusted to be neutral with potassium hydroxide solution to obtain a waterproofing agent. Others are the same as those in the first or second embodiment.

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Abstract

The invention discloses a preparation method of a biodegradable coating material, relates to a preparation method of a coating material, and aims at solving the technical problem that an existing coated slow release fertilizer is relatively high in price. The method comprises the following steps: mixing corn starch with an enhancer, and then adding distilled water; adding a water-proofing agent and a plasticizer, and dropwise adding ammonium hydroxide and ethyl silicate, so as to prepare a film forming solution; carrying out curtain coating of the film forming solution on a polytetrafluoroethylene glass plate under the condition of room temperature; and drying and uncovering a film, so as to obtain the biodegradable coating material. The dosage of the prepared biodegradable coating for a starch-based slow-release fertilizer is 0.5%-1.0% of the total amount of the fertilizer, and the cost of each ton of fertilizer is increased by 72.1-144.2, and is improved by 2.87%-5.76% in comparison with that of common urea. The preparation method belongs to the field of preparation of a chemical fertilizer coating.

Description

technical field [0001] The invention relates to a preparation method of a coating material. Background technique [0002] my country is a large agricultural country, and the steady growth of agricultural production is an indispensable condition for the sustainable development of our country. Modern agriculture is characterized by low input, high output, high efficiency and sustainable development. The closely related chemical fertilizer industry and water resource utilization are the important material basis for modern agricultural production and development. Chemical fertilizers account for about 50% of the cost of agricultural production, while the current utilization rate of common chemical fertilizers is only 30%-35%, and unused chemical fertilizers will pollute the environment. Coated slow-release fertilizers can slow down the nutrient release rate of water-soluble fertilizers and prolong the effective period of fertilizers. It is a new fertilization technology. Howe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L3/02C08L29/04C08L1/26C05G3/00
Inventor 吴琼王雷王东凯曹涤非李瑶黄国庆赵金海薛佳莹孙尧
Owner HEILONGJIANG HEIKE TECH CO LTD
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