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Self-repairing organosilicon polymeric material, and preparation method and application thereof

A polymer material and silicone technology, applied in the field of composite materials, can solve problems such as hindering the application of silicone polymers, indiscriminate application of fertilizers, poor slow-release effect, etc., to achieve huge economic value and industry influence, improve coating Yield, avoid the effect of poor slow release effect

Active Publication Date: 2021-12-24
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation process of organosilicon polymers, Pt catalyst is often required, and the cost is relatively high, which hinders the application of organosilicon polymers in the agricultural field.
On the other hand, the slow-release effect of existing slow-release fertilizers is poor due to the poor performance of the coating material, which causes waste of resources and excessive use of fertilizers.

Method used

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  • Self-repairing organosilicon polymeric material, and preparation method and application thereof
  • Self-repairing organosilicon polymeric material, and preparation method and application thereof
  • Self-repairing organosilicon polymeric material, and preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0098] The process of removal reaction and according to an embodiment of the present application, the preparation method of self-healing silicone polymer material comprises the following steps:

[0099] Step 1. Preparation of modified polysiloxane A (maleimidated polysiloxane A): Dispersed in 30mL of glacial acetic acid with end aminated polysiloxane A or side amino group with different weight average molecular weight Polysiloxane A and maleic anhydride were placed in a 100mL round bottom flask equipped with an air duct, a constant pressure low liquid funnel and a spherical condenser, heated to 140-180°C under electromagnetic stirring and refluxed for 4-8h. , remove glacial acetic acid under reduced pressure and dissolve the residue with chloroform, purify and wash with saturated aqueous sodium chloride several times, and separate the organic phase; add anhydrous magnesium sulfate to the organic phase and dry overnight, remove the organic solvent under reduced pressure to obtai...

Embodiment 1

[0108] The preparation of embodiment 1 organosilicon polymer material 1#

[0109] The reaction equations of modified polysiloxane A1# and modified polysiloxane B1# of the present embodiment are as follows respectively

[0110]

[0111] The preparation method of self-healing organosilicon polymer material 1# comprises the following steps:

[0112] (1) Preparation of modified polysiloxane A1# (maleimidated polysiloxane A1#): Aminopropyl-terminated polysiloxane with a weight-average molecular weight of 5000 dispersed in 30 mL of glacial acetic acid Alkanes and maleic anhydride are placed in a 100mL round-bottomed flask equipped with an airway tube, a constant pressure low liquid funnel and a spherical condenser at a molar ratio of amino to maleic anhydride of 1:1, and heated to 140°C under electromagnetic stirring After reflux for 4 hours, the glacial acetic acid was removed under reduced pressure and the residue was dissolved in chloroform, purified and washed several times ...

Embodiment 2

[0116] The preparation of embodiment 2 coated fertilizer 1#

[0117] Use the organosilicon polymeric material 1# of embodiment 1# as the fertilizer coating process: after sieving the urea with a 10-mesh sieve, pack it with 50g as a portion; get a portion of urea in a drum coating machine, adjust The angle of the coating machine is 35°, and the speed is controlled at 40r / m, so that the urea can form a continuous material curtain in the coating machine; preheat after 15 minutes, and the temperature is controlled at about 90°C, so that the surface of the urea particles is in a slightly molten state , spray into the organosilicon polymer material 1# dissolved in dichloromethane solution, the addition amount of the organosilicon polymer material 1# is selected as 1% of the fertilizer mass, and the rotation speed is adjusted during the coating process to prevent mutual adhesion, so that the organosilicon polymerizes Material 1# forms a uniform film on the surface of urea granules to...

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Abstract

The invention discloses a self-repairing organosilicon polymeric material, and a preparation method and application thereof, and belongs to the field of composite materials. The self-repairing organosilicon polymeric material is characterized in that modified polysiloxane A and modified polysiloxane B are subjected to a Diels-Alder reaction, and at least one reversible substituted cyclohexene is generated for cross-linking polymerization; and the modified polysiloxane A is polysiloxane A substituted by at least one maleimide group, and the modified polysiloxane B is polysiloxane B substituted by at least one furan acetyl group. The organosilicon composite material disclosed by the invention has good hydrophobic property, permeability, film-forming property and reusability; and when the organosilicon composite material is applied to a coating material of a chemical fertilizer, the slow release effect of the fertilizer is improved, the application amount of the coating material is reduced, and the organosilicon composite material has a positive effect on environmental protection.

Description

technical field [0001] The application relates to a self-healing organic silicon polymer material and its preparation method and application, belonging to the field of composite materials. Background technique [0002] With the rapid growth of the world's population and the gradual improvement of people's living standards, the demand for grain production and quality is increasing year by year. The application of fertilizers has become the most effective method to improve grain quality and production. With the rapid development of agriculture, the phenomenon of excessive application of fertilizers in agricultural production is not uncommon. The reason is that after the application of fertilizers, due to the impact of external factors such as rain erosion and light decomposition, most of the nutrients have been lost before being absorbed by crops. The rate is greatly reduced, which leads to the phenomenon of over-application of fertilizer. Excessive application of fertilizers...

Claims

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Application Information

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IPC IPC(8): C08L83/08C08J3/24C05G3/40C05G5/30
CPCC08J3/24C05C9/00C05G3/40C05G5/37C08J2383/08C08J2483/08
Inventor 王华周传健卢海峰张晨梁艳
Owner SHANDONG UNIV
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