Viscoelastic Elastomer Coating for Fertilizer Moisture and Dust Control
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Solution Overview
Problem
Hygroscopic particulate fertilizers, especially nitrogen-containing ones, face issues with moisture absorption and dust formation, particularly in tropical and subtropical conditions, where existing conditioning agents either fail to prevent moisture absorption or make the fertilizers sticky when attempting to reduce dust formation.
Innovation Solution
A conditioning agent comprising 10-50% wax, 40-90% mineral oil, and 1-15% resin, with 0.1-1% viscoelastic elastomer, specifically designed to be waterproof, flexible, and non-toxic, which reduces moisture absorption and dust formation without making the fertilizers sticky, even at high humidity and temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If known conditioning agents are applied in large amounts to prevent moisture absorption, then moisture uptake is reduced, but dust formation increases and fertilizer becomes sticky
Solution Approach 1:
The invention changes the chemical composition parameters of the conditioning agent by incorporating specific polymers (polyisobutylene and/or polyethylene) with defined molecular weights and hydrocarbon structures. This compositional parameter change enables effective moisture protection at lower application rates (0.1-2 weight%), preventing both excessive dust formation and stickiness that occur with conventional agents applied in larger amounts.
Solution Approach 2:
The invention uses composite material structures by combining wax (10-50 weight%), mineral oil (40-90 weight%), and specific polymers (0.1-1 weight%). This composite approach creates a synergistic coating system where the polymer components enhance moisture resistance while the wax and oil components control dust and prevent stickiness, achieving balanced performance that single-component agents cannot provide.
2Object-generated harmful factors
If conditioning agents are applied to reduce dust formation, then dust is reduced, but moisture absorption increases in tropical conditions
Solution Approach 1:
The invention addresses this contradiction by changing the molecular parameters of the conditioning agent components. The specific polymers used (polyisobutylene with Mn 100,000-5,000,000 and/or polyethylene with Mn 100,000-5,000,000) have high molecular weights and specific hydrocarbon structures that provide both dust suppression and moisture resistance, unlike conventional lower molecular weight agents that fail in tropical humidity.
Solution Approach 2:
The invention copies and enhances the beneficial properties of natural hydrocarbon structures found in effective moisture barriers. By using synthetic hydrocarbons (polyisobutylene and polyethylene) that mimic and improve upon natural protective structures, the coating achieves superior dual performance in dust reduction and moisture protection compared to conventional conditioning agents.
3Object-generated harmful factors
If conventional conditioning agents are used at normal humidities, then dust formation is reduced, but they fail in tropical and subtropical conditions
Solution Approach 1:
The invention changes the thermal and chemical stability parameters of the conditioning agent by selecting polymers with high molecular weights and stable hydrocarbon structures. These parameter changes enable the coating to maintain its dust-reducing properties and structural integrity at elevated temperatures and high humidity conditions characteristic of tropical and subtropical environments, where conventional agents degrade or become ineffective.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces moisture absorption by over 90% and dust formation by up to 95%, maintaining the flowability and non-stickiness of the fertilizers, even under tropical and subtropical conditions, and is environmentally acceptable and degradable.
Implementation Method 1
0.1 to 1 weight% of a viscoelastic elastomer which is soluble in mineral oil and has an average molecular weight of 30.000 to 5.000.000
Implementation Method 2
a conditioning agent comprising 10 to 50 weight% of wax, 40 to 90 weight% of a mineral oil and 1 to 15 weight% of a resin being mineral oil-soluble and miscible with wax
Data Source
AI summary
The invention relates to a conditioning agent for reducing water absorption and dust formation of a particulate fertilizer, comprising 10 to 50 weight% of wax, 40 to 90 weight% of mineral oil and 1 to 15 weight% of a resin being mineral oil-soluble and miscible with wax and mineral oil, wherein the agent further comprises 0,1 to 1 weight% of a viscoelastic elastomer selected from the group of polyisobutylene and styrene-isoprene-styrene block copolymer which is soluble in mineral oil and has an average molecular weight of 30.000 to 5.000.000. The invention further relates to a particulate fertilizer composition, preferably a urea-ammonium sulfate (UAS) fertilizer, a urea fertilizer or a calcium nitrate fertilizer, comprising a particulate substrate, preferably an hygroscopic fertilizer, preferably a nitrogen- containing fertilizer, and 0.05 to 2 weight% of said coating thereon for reducing moisture uptake and dust formation of said fertilizer.