Biocompostable Superabsorbent Polymer for Sanitary Articles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current sanitary absorbent articles, such as diapers and menstrual pads, rely on non-biodegradable superabsorbent polymers like polyacrylates, which are not environmentally friendly and can cause allergic reactions, while biodegradable alternatives often have inferior absorption properties and higher production costs.
Innovation Solution
Development of modified biopolymers with high bioderived content, specifically charge-modified and crosslinked starch-based superabsorbents that are biocompostable, replacing traditional synthetic polymers in absorbent cores for sanitary articles, ensuring high absorption capacity and environmental sustainability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional synthetic polymers like polyacrylates are used in absorbent cores, then absorption properties are improved, but biodegradability and environmental sustainability deteriorate
Solution Approach 1:
The patent applies parameter changes by chemically modifying starch polymers through charge modification (adding ionic groups) and crosslinking (forming molecular networks). These parameter changes transform the physical and chemical properties of the biopolymer, enabling it to achieve absorption properties comparable to synthetic polymers while maintaining biodegradability. The charge modification increases hydrophilicity and swelling capacity, while crosslinking provides structural stability for sustained absorption.
Solution Approach 2:
The invention creates a composite material system by combining modified starch polymers with natural fibers (cellulose, lignin) in the absorbent core. This composite approach leverages the complementary properties of different biopolymers: the charge-modified starch provides superabsorbent capabilities, while the natural fiber matrix offers structural support and additional absorption. The composite structure achieves both high absorption performance and biodegradability.
2Object-affected harmful factors
If biodegradable biopolymers are used to replace synthetic polymers, then environmental sustainability is improved, but absorption properties deteriorate
Solution Approach 1:
The patent fundamentally changes the parameters of biopolymers through chemical modification. Charge modification introduces ionic groups (carboxyl, sulfate, or phosphate groups) that dramatically increase the polymer's ability to absorb and retain water and bodily fluids. Crosslinking creates a three-dimensional network structure that prevents polymer dissolution while maintaining porosity for fluid absorption. These parameter changes enable biopolymers to achieve absorption capacities previously only attainable with synthetic polymers.
Solution Approach 2:
The invention replaces the mechanical/physical absorption mechanism of traditional biopolymers with a chemically enhanced mechanism. Instead of relying solely on physical capillary action in natural fibers, the charge-modified polymers use electrostatic interactions, osmotic pressure, and hydrophilic effects to actively attract and bind fluid molecules. This substitution of absorption mechanism dramatically enhances performance while maintaining biodegradability.
3Object-affected harmful factors
If biodegradable biopolymers are used instead of synthetic polymers, then biocompostability is improved, but production costs increase
Solution Approach 1:
The patent employs disposable biopolymers that are designed for single use and then biodegrade. By selecting starch and other natural polymers as base materials, the invention starts with inexpensive, renewable feedstocks. The charge modification and crosslinking processes, while adding functionality, use relatively simple chemistry and can be implemented in existing polymer production infrastructure, keeping manufacturing costs competitive with synthetic alternatives.
Solution Approach 2:
The biodegradable polymers possess self-service capabilities through their inherent biodegradability. After use, the materials automatically decompose through natural biological processes without requiring specialized disposal infrastructure or energy-intensive recycling systems. This self-degradation feature reduces long-term waste management costs and aligns with circular economy principles, potentially offsetting higher initial material costs.
4Reliability
If synthetic polymers are used in absorbent articles, then absorption performance is improved, but user safety deteriorates due to allergic reactions
Solution Approach 1:
The patent uses disposable biopolymers derived from natural sources like starch, cellulose, and chitosan. These materials are inherently biocompatible and free from the synthetic chemicals that cause allergic reactions. The single-use nature ensures that any potential contaminants or degradation products are eliminated after the product's functional life, preventing long-term exposure issues.
Solution Approach 2:
The invention creates composite absorbent cores using multiple natural polymers (starch, cellulose, lignin, chitosan) that are all biocompatible. This multi-component biopolymer system provides diverse absorption mechanisms while maintaining skin friendliness. The natural fiber matrix also provides breathability and comfort, reducing the risk of skin irritation compared to synthetic polymer contacts.
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 modified biopolymers provide enhanced absorbency and biodegradability, meeting or exceeding the performance of traditional polymers while ensuring environmental sustainability and user safety, with at least 90% degradation within 180 days, aligning with biocompostability standards.
Implementation Method 1
superabsorbent properties
Implementation Method 2
absorption properties
Implementation Method 3
at least 90% degradation within 180 days
Data Source
AI summary
Disclosed is an absorbent article with biocompostable properties, such as a baby diaper, adult incontinence product, or a feminine hygiene pad. Particularly, the present invention is directed to a biocompostable absorbent sanitary article with a high degree of biocompostability. The sanitary article comprises, in one embodiment, at least a top layer, a back layer, and absorbent core, wherein the absorbent core includes a superabsorbent polymer, and wherein at least the superabsorbent polymer is biocompostable.