Urea Granulate Compressibility Reduction via Biodegradable Polymer Additives
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Solution Overview
Problem
Urea granulates are prone to crushing and caking during storage and transport, especially in tropical conditions, leading to dust problems and moisture sensitivity, and existing additives either require large quantities, pose toxicity risks, or cause undesirable effects like foam formation or color changes in industrial applications.
Innovation Solution
Adding a mixture of at least two different polymers to the urea melt, including a poly-alkenyl compound and a polymer with hydroxyl, carboxylic acid, amine, or amide groups, such as polyvinyl alcohol or polyaspartic acid, significantly reduces compressibility and caking tendencies while maintaining low moisture sensitivity and avoiding environmental burdens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If formaldehyde derivatives are added to improve crushing strength, then the crushing strength increases, but the composition becomes poisonous and difficult to handle
Solution Approach 1:
The patent replaces toxic formaldehyde derivatives with a biodegradable polymer additive that is environmentally friendly and safe to handle. The polymer serves as a temporary protective agent during storage and transport that does not persist as a harmful substance, effectively substituting a short-lived functional additive for a toxic one.
Solution Approach 2:
The patent changes the chemical nature of the additive from toxic formaldehyde derivatives to biodegradable polymers with specific molecular weights and compositions. This parameter change in the additive's chemical structure eliminates toxicity while maintaining or improving the crushing strength enhancement function.
2Stability of the object's composition
If poly(vinyl acetate)/surfactant combination is used to reduce caking tendency, then caking is reduced, but foam formation increases in industrial applications
Solution Approach 1:
The patent removes the surfactant component from the additive combination that causes foam formation in industrial applications. By using only the poly(vinyl acetate) polymer without the surfactant, the patent eliminates the harmful foam generation while retaining the caking prevention benefit.
Solution Approach 2:
The patent uses a biodegradable polymer additive that serves its protective function temporarily during storage and transport, then degrades without causing long-term environmental harm or unwanted side effects like foam formation in subsequent industrial applications.
3Stability of the object's composition
If inorganic salts are added to decrease compressibility, then compressibility decreases, but pH decreases strongly when dissolving urea in water
Solution Approach 1:
The patent replaces inorganic salts with biodegradable organic polymers that provide compressibility reduction without the harmful side effect of pH decrease. The organic polymers degrade into benign substances that do not affect the pH of water solutions.
Solution Approach 2:
The patent changes the additive type from inorganic salts to organic polymers, fundamentally altering the chemical parameters of the system. This parameter change eliminates the pH-decreasing effect while maintaining the compressibility reduction benefit through the polymer's physical properties.
4Stability of the object's composition
If polyvinyl alcohol is used to prevent caking, then caking is prevented, but dust formation increases due to internal moisture migration
Solution Approach 1:
The patent uses a composite additive system combining poly(vinyl acetate) polymer with specific molecular weight and composition, creating a material that prevents caking through its polymer structure without causing the moisture migration issues that lead to dust formation. The composite nature of the polymer provides multiple functional benefits simultaneously.
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 polymer mixture substantially decreases compressibility, caking, and re-crystallization of urea granulates, enhancing their handling and storage stability with minimal environmental impact and no adverse effects on industrial applications.
Implementation Method 1
a first polymeric compound and a second polymeric compound are added to a urea melt... substantially decreases compressibility
Implementation Method 2
the tendency of caking... is substantially lower than of untreated urea... during storage and handling
Implementation Method 3
dust formation by re-crystallization of the composition is substantially lower than of untreated urea
Data Source
AI summary
Colorfast urea composition having reduced compressibility, cake formation and tendency of re-crystallization of the urea granulate, wherein the granulate further contains at least two different biodegradable polymers, of which at least one polymer is preferably a polyalkenyl amine compound. The other polymer is preferably polyaspartic acid or polyvinyl alcohol. The invention further relates to a process for the preparation of such a urea composition.