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Polyester polyol polyurethane controlled-release fertilizer film material synthesized from sebacic acid byproduct fatty acid

A technology for synthesizing polyester polyols and fatty acids, which is applied in the directions of polyurea/polyurethane coatings, carboxylate preparation, layered/coated fertilizers, etc. Uncontrollable and other problems, to achieve the effect of low price, pressure relief, and low production cost

Active Publication Date: 2021-10-19
巨野茂施农业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, castor oil is modified to prepare polyester polyol, and coated controlled-release fertilizer is further prepared. The modification process of castor oil is uncontrollable, and the price of castor oil is relatively high, which increases the production cost.

Method used

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  • Polyester polyol polyurethane controlled-release fertilizer film material synthesized from sebacic acid byproduct fatty acid
  • Polyester polyol polyurethane controlled-release fertilizer film material synthesized from sebacic acid byproduct fatty acid
  • Polyester polyol polyurethane controlled-release fertilizer film material synthesized from sebacic acid byproduct fatty acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] One, a kind of production method of sebacic acid byproduct polyester polyol, the method may further comprise the steps:

[0039] 1) First, put 1 mol of sebacic acid by-product fatty acid and 1 mol of glycerin in the reactor, then heat it to 160°C for esterification reaction, and keep it at 160°C for 3 hours, and cool down when the acid value drops to 1.50mgKOH / g , to obtain a yellow transparent viscous liquid, which is the by-product fatty acid glyceride of sebacic acid, which is reserved for subsequent reactions;

[0040] 2) Add 330g diethylene glycol, 10g glycerin, 100g phthalic anhydride, 300g terephthalic acid, and 260g sebacic acid by-product fatty acid glyceride obtained in step 1) into the reaction vessel, and then add titanic acid The isopropyl ester catalyst was heated to reflux reaction, kept at 220°C and tested the acid value. When the acid value dropped to 1.50mgKOH / g, the temperature was lowered to 180°C, and vacuum distillation was started. The vacuum degr...

Embodiment 2

[0043] One, a kind of method utilizing the synthetic polyester polyol of embodiment 1 to prepare polyurethane coating controlled release fertilizer, comprises the following steps:

[0044] Weigh 1 kg of granular urea with a particle size of 2.00mm-4.75mm and add it to the sugar coating machine for heating at 60°C; mix and stir 2.8g of polymeric MDI and 4.2g of polyester polyol, then add it to the surface of granular urea, polyurethane The film starts cross-linking reaction on the surface of granular urea, and the viscosity increases. After the coating material is gradually solidified on the surface of urea for 3-5 minutes and dispersed, a dense and tough polyurethane film is formed, with a coating rate of 0.7%. Repeat 3 times, add 2.8g of polymerized MDI and 4.2g of polyester polyol for the second and third times respectively, until the coating rate is 2.1%. Finally, 0.2% paraffin of the total mass of the fertilizer was added to prevent the fertilizer particles from sticking t...

Embodiment 3

[0050] One, a kind of production method of sebacic acid byproduct polyester polyol, the method may further comprise the steps:

[0051] 1) First, put 1 mol of sebacic acid by-product fatty acid and 1 mol of glycerin in the reactor, then heat it to 180°C for esterification reaction, and keep it at 180°C for 3 hours, and cool down when the acid value drops to 1.50mgKOH / g , to obtain a yellow transparent viscous liquid, which is the by-product fatty acid glyceride of sebacic acid, which is reserved for subsequent reactions;

[0052] 2) Add 350g of diethylene glycol, 10g of glycerin, 200g of isophthalic acid, 200g of terephthalic acid, and 300g of sebacic acid by-product fatty acid glycerides obtained in step 1) into the reaction vessel, and then add organotin Heat the catalyst to reflux reaction, keep warm at 230°C and check the acid value. When the acid value drops below 1.63mgKOH / g, cool down to 190°C and start vacuum rectification. The vacuum degree is controlled at -0.065~-0....

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Abstract

The invention discloses a polyester polyol polyurethane controlled-release fertilizer film material synthesized from sebacic acid byproduct fatty acid, belonging to the technical field of controlled-release fertilizer film materials. According to the invention, the sebacic acid byproduct fatty acid, phthalic acid (anhydride), diethylene glycol or diethylene glycol as well as glycerol, adipic acid and the like are used for synthesizing high-performance bio-based polyester polyol, and then the high-performance bio-based polyester polyol and polymerized MDI are subjected to cross-linking film forming on the surface of a fertilizer; the sebacic acid byproduct fatty acid is prepared by refining a byproduct obtained in production of sebacic acid through castor oil, so price is low; and a controlled-release fertilizer prepared from the polyester polyol synthesized by using the sebacic acid byproduct fatty acid has excellent product performance, is economical, has very good cost performance, is good in degradation after being applied into soil, realizes perfect combination of high performance, low cost and environmental protection, and is an effective measure for comprehensively utilizing the sebacic acid byproduct.

Description

technical field [0001] The invention relates to the technical field of controlled-release fertilizer coating materials, in particular to a polyester polyol polyurethane controlled-release fertilizer film material synthesized from sebacic acid by-product fatty acids. Background technique [0002] Sebacic acid is the main raw material for making nylon fiber. my country's sebacic acid production accounts for about 90% of the world's production. At present, the domestic preparation method uses castor oil as raw material. Castor oil is produced through hydrolysis, cracking, acidification and other steps. During the production process, a large number of by-products are produced. These by-products mainly contain some fatty acids and their sodium soaps, as well as water, phenol and organic polymer components. Fatty acid is the main by-product (referred to as sunflower fat) in the production process of sebacic acid, accounting for 60% of the output of sebacic acid. Due to the high-te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/68C08G18/67C08G63/66C08G63/60C07C69/82C07C69/80C07C67/08C05G3/40C05G5/30
CPCC08G18/683C08G18/675C08G63/66C08G63/60C07C69/82C07C69/80C07C67/08C05G3/40C05G5/37C08G18/4288C08G18/7664C08G2310/00C09D175/06C08G63/48C08G63/676C07C51/493C07C67/03C08G18/36C08G63/78C08G18/42
Inventor 钟成虎
Owner 巨野茂施农业科技有限公司
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