Oxygen Absorber Resin Blending Hydrogen Suppression
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Solution Overview
Problem
Existing oxygen absorbers for packaging materials face challenges in effectively suppressing hydrogen generation, maintaining oxygen-absorbing capability, and producing coarse particles during heat treatment, which affects the appearance and productivity of gas-barrier resin containers.
Innovation Solution
A mixed powder oxygen absorber comprising iron powder, a metal halide, and an alkaline substance, with specific surface area, particle size, and heat treatment conditions to minimize hydrogen generation and preserve oxygen-absorbing efficiency, featuring a half-peak width of 0.20°/2θ, specific surface area of 0.5 m2/g or more, and average particle size of 1 to 40 μm, and using calcium hydroxide or calcium oxide as the alkaline substance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If heat treatment is conducted to suppress hydrogen generation, then hydrogen generation is suppressed, but coarse particles are formed in large amounts
Solution Approach 1:
The invention changes the parameters of heat treatment by conducting it in a reducing atmosphere (nitrogen or carbon dioxide) instead of oxidizing atmosphere, at temperatures of 100-300°C for 1-48 hours. This parameter change suppresses hydrogen generation while preventing coarse particle formation that occurs in conventional oxidizing atmosphere heat treatment
Solution Approach 2:
The invention uses an inert or reducing atmosphere (nitrogen or carbon dioxide) during heat treatment to prevent oxidation of iron powder. This creates a protective environment that suppresses hydrogen generation through controlled oxidation while preventing the formation of coarse sintered particles, thereby resolving the contradiction between hydrogen suppression and particle control
2Object-generated harmful factors
If heat treatment is conducted to suppress hydrogen generation, then hydrogen generation is suppressed, but oxygen-absorbing capability decreases
Solution Approach 1:
The invention optimizes heat treatment parameters by conducting treatment in reducing atmosphere at 100-300°C for 1-48 hours, which controls the degree of oxidation. This parameter optimization suppresses hydrogen generation while maintaining sufficient oxygen-absorbing capability by preventing excessive oxidation that would occur in conventional heat treatment
Solution Approach 2:
The invention applies partial oxidation control by using reducing atmosphere heat treatment that allows minimal controlled oxidation to suppress hydrogen generation, while avoiding excessive oxidation that would destroy oxygen-absorbing capability. This partial action approach maintains the balance between hydrogen suppression and oxygen absorption function
3Shape
If classification operation is conducted to remove coarse particles, then appearance is improved, but yield and productivity are lowered
Solution Approach 1:
The invention performs preliminary action by conducting heat treatment in reducing atmosphere before classification to prevent coarse particle formation in the first place. This preliminary prevention eliminates the need for extensive classification operations, thereby maintaining both appearance quality and production yield
Solution Approach 2:
The invention extracts the harmful oxidation process by replacing it with reducing atmosphere heat treatment, thereby preventing coarse particle formation at the source. This extraction approach eliminates the need for subsequent classification operations to remove defective particles, improving both appearance and productivity
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 suppresses hydrogen generation, maintains high oxygen-absorbing capability, and prevents the formation of coarse particles, ensuring the content is well-preserved and the container's appearance is maintained without swelling or rupture, while improving yield and productivity.
Implementation Method 1
iron reacts with water to generate hydrogen
Implementation Method 2
the surfaces of the iron powder are coated with an iron oxide, and the content of metal iron in the iron powder is 60 to 85% by weight; The amount of metal iron in the iron powder decreases due to the heat treatment in the presence of oxygen
Implementation Method 3
JP-A-2000-248111 proposes a technology for adding an alkaline substance which is sparingly soluble in water to an oxygen absorber
Data Source
AI summary
An oxygen absorber for blending in a resin, comprising a mixed powder containing an iron powder, a metal halide and an alkaline substance, and having a half-peak width on a plane (110) of 0.20°/2θ (Co—Kα) or less as measured by a powder X-ray diffraction method, a specific surface area of 0.5 m2/g or more, and an average particle size of 1 to 40 μm. The oxygen absorber effectively suppresses the generation of hydrogen, features excellent safety, exhibits excellent oxygen-absorbing capability and offers an advantage of high productivity due to the suppressed occurrence of coarse particles in the step of producing the oxygen absorber.