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A two-component modified polyurethane slow-release coating material with chelating function

A two-component modified and coated material technology, which is applied in the direction of fertilizer mixture, application, and fertilization equipment, can solve the problems of high cost, difficult soil degradation, and limited application range, etc., and achieves strong mechanical damage resistance and improved phosphate fertilizer. Utilization rate, the effect of avoiding secondary pollution

Active Publication Date: 2017-12-05
安徽德睿轩科技服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inorganic coating materials have disadvantages such as poor sealability, brittle film, and easy to fall off, making it difficult to achieve controlled release of nutrients in the true sense
Compared with inorganic coating materials, polymer resin coating materials have a better controlled-release effect, but the polymer resin coating materials currently on the market need to be dissolved with a certain amount of organic solvent before use, and in the soil It is not easy to degrade, so it is easy to cause pollution to the environment, and it is easy to damage the soil structure after long-term use
In addition, the coating materials currently on the market are high in cost, large in consumption, and single in function, thus limiting their scope of application.

Method used

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  • A two-component modified polyurethane slow-release coating material with chelating function
  • A two-component modified polyurethane slow-release coating material with chelating function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: A two-component modified polyurethane sustained and controlled release coating material with chelating function

[0031] in N 2 Under protection, in a reaction vessel with a reflux condenser and a thermometer, add 45g of toluene diisocyanate (IPDI), polybutylene adipate diol (PBA) with a hydroxyl value equal to 55mgKOH / g after vacuum dehydration and 20g of castor oil with a hydroxyl value equal to 163mgKOH / g, react at a constant temperature of 90°C for 1.5h under mechanical stirring; cool down to 50°C, add 8.5g of dimethylolpropionic acid (DMPA), diethylene glycol ( DEG) 5.2g, 3 drops of dibutyltin dilaurate (T-12) and 1 drop of stannous octoate (T-9), continue to react at 60°C for 3 h, add 0.05g of azobisisobutyrocyanide ( AIBN) maleic anhydride (MHA) 15g, vinyl acetate (VAc) 10g, acrylic acid (AA) 10g, stir evenly, add triethylamine 6.4g under the action of high shear force and neutralize for 1min, under high speed stirring Add 250g of deionized water bel...

Embodiment 2

[0034] Example 2: A two-component modified polyurethane sustained and controlled release coating material with chelating function

[0035] in N 2 Under protection, in a reaction vessel with a reflux condenser and a thermometer, add 45g of isophorone diisocyanate (IPDI), polybutylene adipate diol with a hydroxyl value equal to 110mgKOH / g after vacuum dehydration (PBA) 50g and castor oil with a hydroxyl value equal to 163mgKOH / g 21g, react at a constant temperature of 85°C for 2h under mechanical stirring; cool down to 50°C, add 8.5g of dimethylolpropionic acid (DMPA), 3 drops of dibutyltin Laurate (T-12) and 1 drop of stannous octoate (T-9), continue to react at 70°C for 3.5h, cool down, add vinyl acetate (VAc) dissolved in 0.05g azobisisobutylcyanide (AIBN) 15g, 15g maleic anhydride (MHA), 15g acrylic acid (AA), stir evenly, add 7.4g triethylamine under high shear force for neutralization for 1min, then add 250g deionized water below 15℃ under high speed stirring , 50g of aq...

Embodiment 3

[0038] Example 3: A two-component modified polyurethane sustained and controlled release coating material with chelating function

[0039] in N 2 Under protection, in a reaction vessel with a reflux condenser and a thermometer, add 78g of diphenylmethane diisocyanate (MDI), and 50g of polyoxypropylene glycol (PPG) whose hydroxyl value after vacuum dehydration is equal to 110mgKOH / g, 20g of castor oil with a hydroxyl value equal to 163mgKOH / g was reacted at a constant temperature of 70°C for 1.5h under mechanical stirring; the temperature was lowered to 50°C, and 7.2g of dimethylolbutyric acid (DMBA) and 1,4-butanediol (BDO) were added ) 6.5g, heat up to 60°C and continue the reaction for 3.5h, add 15g of vinyl acetate (VAc) dissolved in 0.05g of benzoyl peroxide (BPO), 15g of maleic anhydride (MHA), 10g of acrylic acid (AA), and stir Evenly, add 6.4g of triethylamine under high shear force for neutralization for 1min, then add 250g of deionized water below 15℃ and 50g of aque...

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PUM

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Abstract

The invention discloses a two-component modified polyurethane sustained or controlled release coating material with the chelation function, and belongs to the technical field of high polymer material preparation. The two-component modified polyurethane sustained or controlled release coating material is characterized in that a polyurethane prepolymer is synthesized through diisocyanate, castor oil and polyhydric alcohols at first, an unsaturated monomer is added before emulsification to lower viscosity, then chain extension is performed, and an unsaturated monomer with the chelation and hydrophilic function is introduced through in-site emulsion polymerization. By adjusting and controlling the crosslinking degree and hydrophility of the coating material, the nutrient release speed can be controlled so as to meet the requirements of different crops for nutrients. A chelation group in the material can activate medium trace elements in soil, and polyvinyl acetate and other hydrophilic chain segments have the moisture and fertilizer retention function, so that the fertilizer utilization rate is greatly improved, no organic solvent is used in the synthetic process, and the material is environmentally friendly and free of pollution.

Description

technical field [0001] The invention relates to the technical field of preparation of polymer materials, in particular to a two-component modified polyurethane slow-controlled release coating material with a chelating function and a preparation process thereof. Background technique [0002] Agriculture is the lifeblood of the national economy, and chemical fertilizers play an extremely important role in agricultural production. However, there is a common problem of low utilization rate in the use of fertilizers in our country. The low utilization rate of fertilizers not only causes a huge waste of resources, but also causes serious pollution to the environment on which human beings depend. Therefore, slow and controlled release fertilizers have become a new hot spot in the field of fertilizer research. Compared with quick-acting fertilizers, slow-release fertilizers have the following advantages: 1. The solubility in water is small, and nutrients are released slowly in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/00C08F222/06C08F220/06C08F218/08C08G18/67C08G18/66C08G18/48C08G18/42C08G18/34C08G18/32C08G18/79C05G3/00C05G3/04C05G3/08C05G3/80C05G3/90
Inventor 高明志
Owner 安徽德睿轩科技服务有限公司
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