Polyacetal Resin Composition Formaldehyde Suppression
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Solution Overview
Problem
Polyacetal resin compositions blended with coloring agents do not sufficiently suppress formaldehyde generation and mold contamination during the molding process, while also requiring excellent mechanical properties for molded articles.
Innovation Solution
A polyacetal resin composition incorporating a dihydrazone compound, a polyamide resin with specific physical properties, and a hydrazide compound, blended in specific ratios with a coloring agent, to enhance mechanical properties and reduce formaldehyde generation and mold contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a polyacetal resin composition is blended with a coloring agent, then the molded article can be colored, but the generation of formaldehyde is not sufficiently suppressed
Solution Approach 1:
The patent uses a composite stabilizing system comprising a dihydrazone compound (0.02-5 parts), polyamide resin (0.01-3 parts), and hydrazide compound (0.01-1 part) in combination with coloring agents. This multi-component composite approach provides synergistic formaldehyde suppression while maintaining coloring capability and mechanical properties, resolving the contradiction between coloring and formaldehyde generation suppression.
Solution Approach 2:
The dihydrazone compound acts as an intermediary substance that reacts with formaldehyde to form stable adducts, preventing formaldehyde release. The polyamide resin and hydrazide compound further mediate this process by neutralizing formic acid and providing additional stabilization, enabling the coexistence of coloring agents and formaldehyde suppression.
2Ease of manufacture
If a polyacetal resin composition is blended with a coloring agent, then the molded article can be colored, but contamination of a mold at the time of molding process occurs
Solution Approach 1:
The dihydrazone compound and polyamide resin act as intermediaries that modify the chemical behavior of the polyacetal resin during molding. These substances reduce the reactivity and adhesiveness of the resin toward the mold surface, preventing contamination while allowing coloring agents to be effectively incorporated.
Solution Approach 2:
The patent modifies the chemical parameters of the polyacetal resin composition by adding stabilizing agents that change the resin's interaction properties with the mold. This parameter modification suppresses mold contamination without affecting the coloring capability or mechanical properties.
3Object-generated harmful factors
If stabilizing agents are added to suppress formaldehyde generation, then formaldehyde generation is reduced, but mechanical properties of the molded article may deteriorate
Solution Approach 1:
The patent optimizes the concentration parameters of stabilizing agents within specific ranges: dihydrazone compound (0.02-5 parts), polyamide resin (0.01-3 parts), and hydrazide compound (0.01-1 part) per 100 parts of polyacetal resin. These controlled parameter changes suppress formaldehyde generation while maintaining mechanical properties within acceptable limits.
Solution Approach 2:
The composite stabilizing system provides synergistic effects where each component contributes to formaldehyde suppression without excessively compromising mechanical properties. The combination of dihydrazone, polyamide, and hydrazide compounds distributes the stabilizing function across multiple substances, reducing the negative impact on mechanical strength compared to using a single high-concentration stabilizer.
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 composition effectively suppresses formaldehyde generation and mold contamination while maintaining excellent mechanical properties in molded articles, as demonstrated by reduced formaldehyde absorption and improved tensile strength.
Implementation Method 1
the reactivity between the dihydrazone compound and formaldehyde is increased, and thus generation of formaldehyde can be sufficiently suppressed
Implementation Method 2
the acidity caused by formic acid, which is generated by oxidation of formaldehyde, can be neutralized so that the decomposition of a polyacetal resin is suppressed
Implementation Method 3
oxidation of formaldehyde yields formic acid
Data Source
AI summary
Disclosed is a polyacetal resin composition having a dihydrazone compound (B), which is composed of at least one selected from the group consisting of a dihydrazone compound (B1) represented by the following general formula (1) and a dihydrazone compound (B2) represented by the following general formula (2), blended at a ratio of 0.02 to 5 parts by mass, a polyamide resin (C) blended at a ratio of 0.01 to 3 parts by mass, and a coloring agent (D), which is composed of at least one selected from the group consisting of an inorganic coloring agent and an organic coloring agent, blended at a ratio of 0.01 to 5 parts by mass relative to 100 parts by mass of a polyacetal resin (A). The polyamide resin (C) is a polyamide resin which has at least one physical property of i) a physical property that the melting point or the softening point is not higher than 180°C and ii) a physical property that the amine value is not lower than 2 mgKOH/g: (in the formula, R1 represents an aliphatic hydrocarbon group with carbon atom number of 4 to 19, an alicyclic hydrocarbon group with carbon atom number of 6 to 10, or an aromatic hydrocarbon group with carbon atom number of 6 to 10. R2 to R5 each represent a methyl group) (in the formula, R8 represents an aliphatic hydrocarbon group with carbon atom number of 4 to 19, an alicyclic hydrocarbon group with carbon atom number of 6 to 10, or an aromatic hydrocarbon group with carbon atom number of 6 to 10. R6 and R7 each independently represent an alicyclic hydrocarbon group with carbon atom number of 3 to 12).