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Synthesis method for preparing polyurethane-coated polyether polyol for controlled-release fertilizer at room temperature

A polyether polyol and controlled-release fertilizer technology, which is applied in fertilizer mixtures, layered/coated fertilizers, solid/semi-solid fertilizers, etc., can solve the problems of sticky coating surface, coating adhesion, etc., and achieve solvent resistance. Excellent performance, good slow release effect, low equipment investment and low energy consumption

Pending Publication Date: 2022-05-27
SHANDONG BLUSR DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the problems of reactivity and other problems, the existing polyether polyols are directly used for coating at low temperature, and the surface of the coating will be sticky due to insufficient reaction and curing, and significant adhesion between the coatings will occur.

Method used

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  • Synthesis method for preparing polyurethane-coated polyether polyol for controlled-release fertilizer at room temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Into a 5L stainless steel reactor, 630 g of castor oil, 0.041 g of bimetallic catalyst and 19 ppm of sulfuric acid were added. Replace with nitrogen until the oxygen content in the kettle is less than 80ppm. The temperature was raised to 130-135°C and dehydrated under reduced pressure, H 2 The O content is not higher than 0.05%. 362.96g of propylene oxide and ethylene oxide were mixed and fed, heated to 140°C and pre-dropped. After the reaction was initiated, the reaction temperature was controlled to 135±2°C, and the feed flow rate was 700g / h. After the feed was completed, the internal pressure reaction For 0.5 hours, the temperature was controlled at 130±2°C, the pressure was 0.05-0.1MPa, the temperature was lowered to 90°C, and antioxidant 1076 was added. The analytical indicators are as follows: hydroxyl value: 75.73 mgKOH / g; acid value: 0.03 mgKOH / g; unsaturation value: 0.02 mol / kg; moisture: 0.01%; pH value: 6.95. The polyether polyol has a functionality of 2.7...

Embodiment 2

[0026] 400g of castor oil and 9.06g of solid KOH were added to the 5L stainless steel reactor. Nitrogen replacement, after measuring the oxygen content in the kettle is less than 80ppm, the temperature is raised to 120-125 ℃ for decompression dehydration, timing for 1 hour, H 2 The O content is not higher than 0.05%, 1722.01g propylene oxide is added, the reaction temperature is controlled to 125±2℃, the flow rate is 300g / hour, the pressure is not higher than 0.4MPa, the internal pressure reaction is 1 hour after feeding, and the monomer is removed for 0.5 hours , nitrogen is pressurized, nitrogen is charged to 0.18MPa, the temperature is controlled at 115 ° C, 430.50 g of ethylene oxide is added, and the feed flow rate is 250 g / h. Pure water, phosphoric acid, auxiliary agent (aluminum silicate), vacuum drying, filtration cycle, sampling and testing indicators, named polyether polyol B. The analytical indicators are as follows: hydroxyl value: 30.29 mgKOH / g; acid value: 0.036...

Embodiment 3

[0028] Add 223.24g of glycerol and 100g of pentaerythritol to the 5L stainless steel reactor, vacuum pump 10.5g of potassium methoxide, carry out nitrogen replacement, measure the oxygen content in the kettle after being less than 80ppm, heat up and dehydrate under reduced pressure, H 2 The O content is not higher than 0.05%, the temperature is raised to 115 ° C, the feeding is started, 783.14 g of propylene oxide is added, the pressure during the reaction is not higher than 0.4 MPa, the temperature is controlled at 115 ± 2 ° C, and the internal pressure reaction is 1 hour after the addition. , and de-monomerization for 0.5 hours. Nitrogen was pressed to 0.18MPa, the temperature was controlled at 115°C, ethylene oxide 474.16 was added, the internal pressure was reacted for 30 minutes, the monomer was removed for 0.5 hours, the temperature was lowered to 80°C, and pure water, acetic acid, and auxiliary agent (magnesium silicate) were added, Vacuum drying, filtration cycle, dete...

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Abstract

The invention belongs to the technical field of synthesis of polyether polyol, and particularly relates to a synthesis method of polyurethane coated polyether polyol for preparing a controlled release fertilizer at room temperature. According to the synthesis method, a polyol compound is used as an initiator and is catalyzed by a catalyst, and the polyol compound and an epoxy compound are subjected to a polymerization reaction to prepare the epoxy resin. Wherein the polyol compound is one or more of glycerol, propylene glycol, diethylene glycol, ethylene glycol, pentaerythritol, castor oil, palm oil, corn oil, rapeseed oil, soybean oil or sunflower oil; the epoxy compound is a mixture of ethylene oxide and epoxypropane, and the mass of the ethylene oxide accounts for 20% or above of the total mass of the epoxy compound. The polyether polyol can be applied to a slow / controlled release fertilizer coating, has the characteristics of low cost, room-temperature coating, degradability, environmental friendliness and the like, and has a very good slow release effect when being used as a slow release fertilizer coating material.

Description

technical field [0001] The invention belongs to the technical field of polyether polyol synthesis, and in particular relates to a synthesis method of a polyether polyol for preparing slow and controlled release fertilizer polyurethane coating at room temperature. Background technique [0002] How to improve the utilization rate of fertilizers and prolong the fertilizer effect period has become a research hotspot in the field of fertilizers. Slow and controlled release fertilizer is an effective means to improve the utilization rate. The coating materials of controlled-release fertilizers are divided into two categories: one is thermoplastic resin (Thermoplastic resin), mainly polyolefins, including polyethylene, polypropylene, polystyrene, etc. The coating process of these materials must be solvent Type, the solvent is generally tetrachloroethylene, rosin and so on. In addition to the high cost of coating, environmental pollution, production speed, and poor degradation, sol...

Claims

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Application Information

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IPC IPC(8): C08G65/28C05G3/30C05G3/40C05G5/12C05G5/30
CPCC08G65/2609C05G3/40C05G5/37C05G3/30C05G5/12Y02P60/21
Inventor 李帅徐韦贾世谦侯沛东穆潇潇
Owner SHANDONG BLUSR DONGDA CHEM
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