Membrane material for producing coated material and preparation technique thereof

A technology for the production of bag and film materials, applied in the form of fertilizer, fertilizer mixture, application, etc., can solve the problems that natural starch cannot be plasticized, limit application and development, and high glass transition temperature, achieve storage resistance, easy coating operation, The effect of less investment in equipment

Inactive Publication Date: 2008-06-18
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Abstract
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AI Technical Summary

Problems solved by technology

Native starch has defects such as poor fat solubility, large granules, poor stability, poor mechanical properties, water resistance, and toughness, difficult to process into a film, and poor processability. The size film is hard and brittle because its macromolecular chain is a ring structure. It is composed of glucose residues, has poor flexibility, and has a glass transition temperature as high as 330°C; natural starch cannot be plasticized when heated, and it is difficult to process it into useful products. These characteristics greatly limit its application and development.

Method used

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  • Membrane material for producing coated material and preparation technique thereof
  • Membrane material for producing coated material and preparation technique thereof
  • Membrane material for producing coated material and preparation technique thereof

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preparation example Construction

[0027] Preparation process of high degree of substitution acetate starch:

[0028] The preparation methods of acetate starch mainly include wet method and dry method, and the most important preparation method is wet method.

[0029] The wet production process is as follows:

[0030] Starch→starch milk→reagent reaction→washing→dehydration→drying→crushing→packing

[0031] Dry production process is as follows:

[0032] Starch → reagent soaking → pre-drying → drying → cooling → water adjustment → packaging

[0033]Specific operation: Add industrial high-grade starch into the reaction kettle, add 2 to 20 times of esterification agent, 1 to 50 parts of esterification catalyst solution, stir at the reaction temperature of 30°C to 150°C, and the reaction time is 1 to 50°C. After 9 hours, after the reaction, the pH value was 6.5-10, and then the reaction solution was introduced into excess cold water with vigorous stirring to obtain a white flake-like precipitate, which was fully wa...

Embodiment 1

[0039] The acetate starch was prepared with industrial high-grade starch as the main material, acetic anhydride as the esterification agent, and 50% (mass fraction) sodium hydroxide as the esterification catalyst.

[0040] Put 100g of starch into the reaction axe, add 400g of acetic anhydride and 30g of 50% sodium hydroxide, the pH is 9 to 9.5, and react at 123°C for 2.5 hours. , a white flake-like precipitate was obtained, which was fully washed with water, filtered, and dried to obtain acetate starch with a substitution degree of 2.18.

Embodiment 2

[0042] The acetate starch was prepared by using high-grade industrial starch as the main material, acetic anhydride as the esterification agent, 50% (mass fraction) sodium hydroxide as the esterification catalyst and pyridine as the activation medium.

[0043] Put 20g of starch into the reactor, add 30ml of pyridine activation medium, activate at 115°C for 1 hour, add 30g of water for gelatinization, dehydrate at reflux temperature, then put it into the reactor, add 100g of acetic anhydride and 50% Sodium hydroxide 30g, pH 8-8.5, react at 140°C for 1 hour, after the reaction, cool to room temperature, add an equal amount of acetone solution, mix well, introduce 100 times the volume of excess water under vigorous stirring, Immediately a white flocculent precipitate with slight yellowish bands appears, continue to stir to make the product precipitate completely, stand still for a while, wash the precipitate with water, filter until the filtrate is neutral or weakly acidic, the pr...

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Abstract

The invention relates to a fertilizer production, substantially an acetic ester starch film material for manufacturing envelope controlled releasing fertilizer and the preparation technology. The film material takes the starch as the major material, and the property of the starch is changed by adopting a series of chemical processes, thereby the performance of the necessary film material of the envelope controlled releasing fertilizer can be realized, and the film material for preparing envelope controlled releasing fertilizer can be obtained. The invention takes the starch derivative which can be biodegraded fully as the film material to prepare the envelope controlled releasing fertilizer; the process of the invention for manufacturing the raw material of the film material and the film material fetching are simple, the equipment invention is less; the manufacture can be small-scale production implemented in laboratory or a mass production in factory.

Description

technical field [0001] The invention relates to the production of fertilizers, in particular to a membrane material of acetate starch-coated fertilizers used for producing coated controlled-release fertilizers and a preparation process thereof. Background technique [0002] With the increase of human agricultural production activities and the demand for land material output, various new technologies and new materials are continuously put into the land, which increases the intensity of land production and damages the agricultural ecological environment. The use of agricultural plastic products is one example. Such as mulch film, resin polymer coated fertilizer film materials, etc. degrade slowly in the soil, and long-term accumulation has caused pollution to the soil environment. Therefore, people are eager to have a material that can replace the current plastic and be used in the production of agricultural means of production, which is both biodegradable and has a good use e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G5/00
Inventor 李东坡武志杰
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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