Method for preparing biodegradable coating material by ammonolysis modified vegetable oil and application of biodegradable coating material

A technology for modifying vegetable oil and coating material, which is applied in the field of fertilizer coating material preparation, which can solve the problems of vegetable oil quality batch differences, easy to break, high energy consumption, etc., to achieve the elimination of edges and corners and surface crystallization, good continuity and toughness , particle surface smooth effect

Active Publication Date: 2019-11-12
WUZHOUFENG AGRI SCI & TECH
View PDF12 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since most oils do not contain active hydrogen, they must be modified before they can be used in the preparation of waterborne polyurethane
[0003] The general practice in the prior art is to make the oil have active groups by copolymerizing the oil and polyurethane, so as to react with isocyanate, but the reaction temperature of transesterification is between 240-260°C, and the energy consumption is high
Under such high temperature conditions, even with the protection of nitrogen, the color of the product cannot be guaranteed, which will affect the appearance of the product
[0004] Utilize the modified vegetable oil of different methods as a part of reaction in the existing fertilizer coating material, the method of modification is mainly epoxidation method, the main defect of epoxidation method is: in epoxidation method, epoxide It is difficult to separate from non-double bond vegetable oil molecules, which will have a greater impact on the performance of the product
The main defect of the epoxidation method is: it is difficult to separate the epoxide and the non-double bond vegetable oil molecules, which will have a great impact on the performance of the product, resulting in large differences in the quality of vegetable oils in batches, and the uncertainty of quality has caused a great impact on the industry. production will be adversely affected
In practice, it has been found that since fertilizer particles usually have corners and surface crystals, these corners and surface crystals are difficult to form a film during the coating process, or are easy to break after film formation, resulting in weakened slow-controlled release of the finished product
At present, the main technical means to solve this problem is to increase the amount of film-forming materials, which will lead to an increase in production costs.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing biodegradable coating material by ammonolysis modified vegetable oil and application of biodegradable coating material
  • Method for preparing biodegradable coating material by ammonolysis modified vegetable oil and application of biodegradable coating material

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0024] Preparation of modified vegetable oil: under the protection of nitrogen, 20 grams of diethanolamine was added to 100 grams of soybean oil, heated in a water bath to 60° C., the reaction process was stirred continuously, the reaction was stopped for 20 minutes, and cooled for later use.

[0025] Preparation of coating material: Add 20 grams of isophorone diisocyanate and 70 grams of polyoxypropylene glycol into 100 grams of the above-mentioned modified vegetable oil, keep warm in a water bath to 70°C, react for 60 minutes, and cool to 30°C. Add 0.2 g of chain extender diethylene glycol, and then add 0.15 g of stannous octoate catalyst, react in a 70°C water bath for 30 minutes, and cool down to 30°C. Add 10 g of N-methyldiethanolamine and react at 60° C. for 60 minutes.

[0026] Coating: First, put urea granules in the drum, and gradually heat the temperature of urea granules from room temperature to 45°C under the rotation of the drum. During the gradual heating process...

preparation Embodiment 2

[0029] Preparation of modified vegetable oil: under the protection of nitrogen, add 20 grams of diethanolamine to 100 grams of soybean oil, heat in a water bath at 60°C, keep stirring during the reaction, react for 30 minutes, stop, and cool for later use.

[0030] Preparation of coating material: Add 30 grams of isophorone diisocyanate and 100 grams of polyoxypropylene diol to 100 grams of modified vegetable oil, keep warm in a water bath to 80°C, react for 90 minutes, and cool to 50°C. Add 0.2 g of chain extender diethylene glycol, and then add 0.15 g of stannous octoate catalyst, react in a 70°C water bath for 40min, and cool down to 40°C. Add 15 g of N-methyldiethanolamine and react at 50° C. for 60 minutes.

[0031] Coating: First, put urea granules in the drum, and gradually heat the temperature of urea granules from room temperature to 45°C under the rotation of the drum. During the gradual heating process, evenly spray 0.4% urea-formaldehyde solution on the surface of ...

preparation Embodiment 3

[0034] Preparation of modified vegetable oil: under nitrogen protection, add 10 grams of diethanolamine to 100 grams of soybean oil, heat in a water bath at 40°C, keep stirring during the reaction, react for 20 minutes, stop, and cool for later use.

[0035] Preparation of coating material: Add 20 grams of isophorone diisocyanate and 80 grams of polyoxypropylene diol to 100 grams of modified vegetable oil, keep warm in a water bath to 90°C, react for 150min, and cool to 50°C. Add 0.2 g of chain extender diethylene glycol, and then add 0.15 g of stannous octoate catalyst, react in a 70°C water bath for 60 minutes, and cool down to 50°C. Add 20 g of N-methyldiethanolamine and react at 70° C. for 60 minutes.

[0036] Coating: First, put urea granules in the drum, and gradually heat the temperature of urea granules from room temperature to 45°C under the rotation of the drum. During the gradual heating process, evenly spray 0.4% urea-formaldehyde solution on the surface of fertili...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for preparing a degradable coating material by an ammonolysis modified vegetable oil and an application of the biodegradable coating material. The method comprises thefollowing steps: firstly preparing the modified vegetable oil by using an ammonolysis method, respectively adding an isocyanate and a polyoxypropylene diol into the modified vegetable oil, adding a chain extender and a catalyst for carrying out a reaction, and finally adding N-methyldiethanolamine for carrying out a reaction to obtain the degradable coating material. A urea-formaldehyde solutionis sprayed on the surface of fertilizer particles during a preheating stage of the coating. The prepared coating material has relatively good micro-porous air-permeability, is relatively convenient for controlling a release rate of a fertilizer, and has relatively good degradable function. At the same time, the surface of the fertilizer particles is modified before coating to eliminate surface crystallization and angularity of the fertilizer particles to make the surface be relatively smooth and further enhance coating effects.

Description

technical field [0001] The invention relates to a preparation method of a fertilizer coating material. Background technique [0002] Vegetable oil has a relatively large number of ester groups containing hydroxyl groups, which react with isocyanate to form water-based polyurethane with a microporous structure. In addition, vegetable oil contains unsaturated double bonds, which can be modified to obtain products with curing properties. Therefore, the use of vegetable oil and water-based polyurethane to prepare fertilizer coating materials has the outstanding characteristics of good film-forming properties and easy control of the release rate of fertilizers. However, since most oils do not contain active hydrogen, they must be modified before they can be used in the preparation of waterborne polyurethane. [0003] The general practice in the prior art is to make the oil possess active groups by copolymerizing the oil and polyurethane, thereby reacting with isocyanate, but th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C08G18/66C08G18/48C08G18/36C08G18/32C05G3/00
CPCC08G18/3275C08G18/36C08G18/4825C08G18/6688
Inventor 王学江刘昌春李峰
Owner WUZHOUFENG AGRI SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap