Bio-based aromatic hydrocarbon polyester polyol for controlled-release fertilizer and application thereof

Abstract

The invention discloses bio-based aromatic hydrocarbon polyester polyol for controlled-release fertilizer. The bio-based aromatic hydrocarbon polyester polyol is characterized by being synthesized according to a method comprising the following steps: sucking fatty acid (1mol), diethylene glycol (2mol), glycerol (2mol) and the like into a reaction kettle in vacuum according to a sequence; adding terephthalic acid (3mol), phthalic anhydride (2mol) and trimethylol propane (2mol) from a solid feeding hole in the reaction kettle; after stirring in the reaction kettle for 1h, displacing air in the reaction kettle once with nitrogen gas; slowly raising the temperature of the reaction kettle to 180 DEG C to 240 DEG C, carrying out esterification reaction to distill water and maintaining the temperature for 4h; when the temperature of the top of an esterification tower is lower than about 95 DEG C and no water is discharged, sampling and testing an acid value; when the acid value is less than 15mgKOH/g, supplementing a catalyst Tio2/SO4-2 solid super acid which accounts for 0.03 percent of the total amount; continually keeping heat and reacting for 1h; then carrying out vacuum extraction for about 2h and controlling the vacuum degree to be -0.085mPa to -0.095mPa; when the acid value is less than 2mgKOH/g, the reaction is completed; then cooling and filtering and packaging to obtain a bio-based aromatic hydrocarbon polyester polyol finished product.

Description

technical field [0001] The invention belongs to the technical field of controlled-release fertilizers, and in particular relates to a bio-based aromatic polyester polyol for controlled-release fertilizers and an application thereof. Background technique [0002] my country is a big agricultural country and also a big country that uses fertilizers. However, the utilization rate of traditional fertilizers has been low for a long time. In order to achieve the goal of increasing production, there is only excessive application. This not only wastes a lot of resources, but also brings serious damage to the quality of cultivated land and related water bodies. How to improve the utilization rate of fertilizers to achieve the purpose of increasing efficiency, increasing production, reducing weight and reducing pollution is an inevitable requirement for the development of high-efficiency, green and sustainable agriculture, and the emergence of controlled-release fertilizers can just s...

AI Technical Summary

Problems solved by technology

Once the number of coatings is reduced to 3-5%, the controlled release effect of nutrients will be s

Images