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Preparation method of liquefied bio-based coated controlled release material

A controlled-release material and bio-based technology, which is applied in the field of preparation of liquefied bio-based coated controlled-release materials, can solve the problems of increased process and energy consumption, inability to separate and remove, and poor liquefaction quality, so as to reduce process and energy consumption, Effect of shortening liquefaction time and reducing liquefaction cost

Active Publication Date: 2021-09-21
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]①The amount of liquefaction agent is large, the general liquid-solid ratio is 4-6:1, and the liquefaction agent cannot be recycled, and the cost of liquefaction is high; ②The liquefaction process takes a long time High temperature and high pressure conditions, generally 150-200 °C, 1-3 hours, too high temperature will easily cause condensation and carbonization of liquefied products, resulting in poor liquefaction quality and low liquefaction efficiency; The reaction is violent, which can easily cause carbonization of raw materials and rapid decomposition of macromolecular substances, reducing the quality of liquefaction. In addition, strong acid and strong alkali corrode equipment; ④The liquefaction product contains a large amount of liquefaction agent, which cannot be separated and removed, resulting in poor quality of the subsequent coating; ⑤During the liquefaction process Strong acid and strong base or solid acid are needed as catalysts, and the liquefied product needs to be neutralized or decatalyzed before it can be used as a coating material, which increases additional process and energy consumption

Method used

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  • Preparation method of liquefied bio-based coated controlled release material
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  • Preparation method of liquefied bio-based coated controlled release material

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preparation example Construction

[0050] The preparation method of the microcapsule-wrapped catalyst is as follows: dispersing the ionic substances in the polyvinyl alcohol aqueous solution by ultrasonic waves, as the water phase, the concentration of the ionic substances in the water phase is 100-500 mg / ml; dissolving the polylactic acid In dichloromethane, as the oil phase, the concentration of polylactic acid in the oil phase is 50-100mg / ml; the water phase is added to the oil phase and mixed, and the volume ratio of the water phase and the oil phase is 1:1. A water-in-oil emulsion was prepared under stirring, and the droplets were solidified overnight under mechanical stirring, and then collected by centrifugation, and the obtained microcapsules were freeze-dried using a freeze dryer.

[0051] The technical characteristics of the present invention are: the liquefaction agent adopts small-molecular volatile organic matter, which can be recycled, realizes recycling, and reduces waste of resources; adopts micr...

Embodiment 1

[0055] Disperse potassium persulfate in polyvinyl alcohol aqueous solution by ultrasound, as the water phase, the concentration of potassium persulfate in the water phase is 200mg / ml; dissolve polylactic acid in methylene chloride, as the oil phase, polylactic acid in the oil phase The concentration is 80mg / ml; the water phase is added to the oil phase and mixed, the volume ratio of the water phase and the oil phase is 1:1, and the water-in-oil emulsion is prepared under mechanical stirring, and the droplets are solidified overnight under mechanical stirring. Then it is collected by centrifugation, and the obtained microcapsules are freeze-dried by using a lyophilizer to prepare potassium persulfate wrapped in microcapsules.

[0056] The wheat straw is pulverized, passed through a 100-mesh sieve, weighed 20g of powder, and added to the liquefaction device ( figure 2 As shown), turn on the ultrasound, stir, and then add 80g of liquefaction agent (methanol and ethanol are unifo...

Embodiment 2

[0060] Disperse sodium persulfate in polyvinyl alcohol aqueous solution by ultrasound, as the water phase, the concentration of sodium persulfate in the water phase is 100mg / ml; dissolve polylactic acid in methylene chloride, as the oil phase, polylactic acid in the oil phase The concentration is 50mg / ml; the water phase is added to the oil phase and mixed, the volume ratio of the water phase and the oil phase is 1:1, and the water-in-oil emulsion is prepared under mechanical stirring, and the droplets are solidified overnight under mechanical stirring. Then it is collected by centrifugation, and the obtained microcapsules are freeze-dried using a lyophilizer to prepare sodium persulfate wrapped in microcapsules.

[0061] The wheat straw is pulverized, passed through a 100-mesh sieve, weighed 20g of powder, and added to the liquefaction device ( figure 2 As shown), turn on the ultrasound, stir, and then add 60g of liquefaction agent (ethyl acetate and ethanol are mixed uniforml...

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Abstract

The invention discloses a preparation method of a liquefied bio-based coated controlled release material. When the bio-based raw material is subjected to liquefaction treatment, a volatilizable small molecular organic matter is selected as a liquefying agent, an ionic substance is wrapped by a microcapsule technology to serve as a catalyst, and the bio-based material is efficiently liquefied under the condition of lower temperature through ultrasonic treatment, stirring and pressurization; and then the small-molecule liquefying agent is separated out by utilizing an evaporation system to obtain a high-quality liquefied product, thereby preparing the coating material with a good controlled release effect. According to the invention, the liquefaction efficiency and the quality of the liquefied product are greatly improved, the defects in the prior art are effectively overcome, and the method is suitable for industrial popularization and application.

Description

technical field [0001] The invention relates to the technical field of controlled-release fertilizer production, in particular to a preparation method of a liquefied bio-based coated controlled-release material. Background technique [0002] Chemical fertilizer is the largest input in agricultural production, contributing more than 50% to crop yield, and about 70% of the nutrients needed for plant growth come from chemical fertilizers. With the increase of the world's population and the decrease of arable land, the demand pressure of grain output per unit area has caused the trend of increasing the amount of chemical fertilizers. Although the demand for chemical fertilizers continues to increase, the efficiency of nitrogen fertilizer use is still at a low level (about 30% to 50%), which has caused serious waste of resources and environmental pollution. At present, the most effective way to improve the utilization rate of chemical fertilizers is to apply controlled-release f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/40C05G5/30B01J13/02
CPCC05G3/40C05G5/30B01J13/025
Inventor 杨越超马晓晓程冬冬姚媛媛
Owner SHANDONG AGRICULTURAL UNIVERSITY
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