Starch-Based Superabsorbent Polymer for Saline Soil
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Solution Overview
Problem
Existing superabsorbent polymers experience a significant decrease in water absorbance capacity when exposed to salts, which is problematic in agricultural applications where soil salinity is high, leading to reduced effectiveness in increasing water availability for crops.
Innovation Solution
A process for preparing superabsorbent polymers by graft polymerizing a monomer on a polysaccharide at room temperature, using a catalytic system, and neutralizing the copolymer to produce a starch-based superabsorbent polymer with high water absorbance capacity, avoiding the use of acrylamide and minimizing equipment costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional superabsorbent polymers are used in saline soil conditions, then water absorbance capacity is initially high, but absorbance capacity decreases considerably in the presence of salts
Solution Approach 1:
The patent changes the chemical parameters of the polymer by using starch as a base polymer with grafted acrylic acid and methacrylic acid groups, creating a polymer structure that maintains high water absorbance capacity (100-1500 g/g) even in the presence of salts, unlike conventional polyacrylamide-based SAPs whose absorbance decreases considerably in saline conditions
Solution Approach 2:
The patent creates a composite material structure by grafting synthetic acrylic acid and methacrylic acid monomers onto the natural starch polymer backbone, combining the biocompatibility and salt tolerance of starch with the superabsorbent properties of acrylic acid-based polymers, resulting in a material that resists salt interference while maintaining high absorbance
2Productivity
If thermal initiation polymerization is used, then polymerization can proceed effectively, but energy consumption increases and reaction conditions become harsh
Solution Approach 1:
The patent replaces thermal initiation (heat-based) with redox initiation using the potassium permanganate/ascorbic acid system, substituting a thermal field with a chemical field that operates at room temperature, thereby eliminating the need for external heating equipment and reducing energy consumption while maintaining effective polymerization
Solution Approach 2:
The patent changes the initiation mechanism from thermal to redox chemical initiation, allowing polymerization to proceed at room temperature (20-25°C) rather than requiring elevated temperatures, thus reducing energy input while achieving complete polymerization through the selective redox reaction between potassium permanganate and ascorbic acid
3Ease of manufacture
If acrylamide monomer is used, then superabsorbent polymer can be synthesized, but environmental concerns arise and production costs increase
Solution Approach 1:
The patent extracts and removes the problematic acrylamide monomer from the synthesis process, replacing it with environmentally benign alternatives (acrylic acid and methacrylic acid) that achieve the same superabsorbent effect without the environmental persistence and toxicity issues associated with acrylamide, thereby eliminating harmful factors while maintaining manufacturing feasibility
Solution Approach 2:
The patent uses readily available, inexpensive monomers (acrylic acid and methacrylic acid) that can be easily synthesized or obtained, replacing expensive and environmentally problematic acrylamide, while the resulting polymer maintains its superabsorbent functionality without requiring complex purification or special handling procedures
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 resulting superabsorbent polymer exhibits a high water absorbance capacity of 100 to 1500 g/g, maintaining effectiveness in saline conditions and reducing production costs through environmentally friendly and efficient methods.
Implementation Method 1
graft polymerizing a monomer on a polysaccharide at room temperature
Implementation Method 2
using a catalytic system
Implementation Method 3
Superabsorbent polymers absorb water or fluids several times their weight
Implementation Method 4
soluble salts dramatically affect absorption by hydrophilic polyacrylamide gels
Implementation Method 5
neutralizing the copolymer to produce a starch-based superabsorbent polymer
Data Source
AI summary
Described herein is a process for preparation of a superabsorbent polymer with high fluid absorptivity. Also described is a composition including the superabsorbent polymer.