Corrosion-Resistant Paper With Controlled Decomposition Timing

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Solution Overview

Problem

Existing methods for producing corrosion-resistant paper fail to achieve compatibility between corrosion resistance and easy degradability, particularly in agricultural and building materials, leading to environmental concerns and uncontrolled degradation.

Innovation Solution

Using a polycarboxylic acid crosslinking agent to block the hydroxyl group of cellulose fibers, followed by alkali treatment, to create a paper with controlled corrosion resistance and degradability, ensuring strength during use and rapid degradation after planting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a formaldehyde-based crosslinking agent (DMDHEU) is used to block hydroxyl groups of cellulose, then corrosion resistance is improved, but environmental harm and uncontrolled degradation occur

Engineering Contradiction:

Improvecorrosion resistanceVSAvoidenvironmental harm from formaldehyde

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the chemical parameters by replacing formaldehyde-based crosslinking agents with isocyanate-based crosslinking agents. This substitution maintains the crosslinking function while eliminating harmful formaldehyde, thus resolving the contradiction between corrosion resistance and environmental harm.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs biodegradable polyurethane formed through isocyanate crosslinking, which provides temporary corrosion resistance during use but degrades naturally after use. This approach eliminates the need for formaldehyde while ensuring controlled degradation, resolving the environmental harm issue.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Strength

If crosslinking is performed to enhance paper strength and corrosion resistance, then strength during use is improved, but degradability after use is reduced

Engineering Contradiction:

Improvepaper strength during useVSAvoiddegradability after use

Core Design Contradiction:

StrengthVSDuration of action of stationary object

Solution Approach 1:

The patent changes the chemical nature of crosslinking from permanent (formaldehyde-based) to controlled temporary (isocyanate-based). The isocyanate crosslinks provide sufficient strength during use but are designed to degrade naturally, thus resolving the contradiction between maintaining strength and enabling degradability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces dynamic properties to the crosslinked structure by using isocyanate crosslinks that can break down over time. This creates a paper that is strong during use but becomes degradable after use, resolving the contradiction between strength maintenance and degradability.

Inventive Principle:

Principle #15Dynamics

3Reliability

If a paper pot is designed to withstand mechanical processing and handling, then reliability during production and planting is improved, but ease of degradation after planting is reduced

Engineering Contradiction:

Improvestrength during production and plantingVSAvoidease of degradation after planting

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the temporal characteristics of paper strength by using isocyanate crosslinking. The crosslinked structure provides high strength during production and planting operations, but the isocyanate bonds are designed to break down naturally after planting, thus resolving the contradiction between reliability and ease of degradation.

Inventive Principle:

Principle #35Parameter changes

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 method provides a paper with sufficient strength during cultivation and planting, while promoting degradation after use, reducing environmental impact by avoiding formaldehyde-based agents and allowing controlled biodegradation.

Implementation Method 1

the hydroxyl group of cellulose fiber is blocked by a carboxylic acid crosslinking agent

Methodology Applied

Scientific EffectChemical bonding: Chemical Bonding

Implementation Method 2

a method for controlling the degradation of a corrosion-resistant paper, the method comprising a step of alkali treatment

Methodology Applied

Scientific EffectHydrolysis: Hydrolysis

Data Source

PatentUS12546063B2Method for controlling decomposition of corrosion-resistant paper

Publication Date: 2026.02.10 NIPPON BEET SUGAR MFG CO LTD

AI summary

There is provided: a method for controlling corrosion-resistant paper with easy decomposability, whereby the paper has corrosion resistance against decomposition due to microorganisms in soil when raising seedlings, the paper retains satisfactory strength during agricultural planting, and desired decomposability is given to the paper after planting or after harvest of crops; and a method for producing corrosion-resistant paper with controlled decomposability. The controlling method is subjected to corrosion-resistant paper containing paper with cellulose fibers and a carboxylic acid crosslinking agent at least partially bonded to each other, the controlling method including a step for treating the corrosion-resistant paper with alkali; and the producing method comprises a step for applying a processing solution containing a carboxylic acid crosslinking agent to paper containing cellulose fibers, a step for subjecting the paper to a heating treatment, and a step for treating the paper undergone the heating treatment with an alkali.