Plastic Eraser Using Non-Phthalate Plasticizers
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Solution Overview
Problem
Conventional plastic erasers with vinyl chloride resin as a base resin lack effective non-phthalate ester plasticizers that reduce environmental load while maintaining superior erasing performance.
Innovation Solution
A plastic eraser composite body using a combination of 4,5-epoxy-1,2-cyclohexanedicarboxylic acid bis(2-ethylhexyl) and diethylene glycol dibenzoate as plasticizers, with a vinyl chloride resin as the base, and a porous structure formed of an organic polymer, where the plasticizers comprise 30-60% by weight and diethylene glycol dibenzoate is 5-60% by weight, achieving a hardness of 55-75 and gel hardness of 3.0-6.0 kgf.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional phthalate ester plasticizers are used in vinyl chloride resin erasers, then erasing performance is maintained, but environmental harm increases due to endocrine disruptor effects
Solution Approach 1:
The patent changes the chemical parameters of the plasticizer by using non-phthalate ester types (acetyltributyl citrate, 4,5-epoxy-1,2-cyclohexanedicarboxylic acid bis(2-ethylhexyl), sebacic acid diester, or alkylsulfonic acid phenyl ester) instead of conventional phthalate esters. This substitution maintains the plasticizing function while eliminating endocrine disruptor effects, thus resolving the contradiction between erasing performance and environmental harm.
Solution Approach 2:
The patent employs plasticizers with shorter environmental persistence and lower ecological toxicity. These alternative plasticizers are designed to be less harmful to the environment while maintaining functional effectiveness, allowing the eraser to fulfill its purpose without long-term environmental contamination.
2Object-affected harmful factors
If non-phthalate ester plasticizers are introduced to reduce environmental load, then environmental harm decreases, but erasing performance deteriorates
Solution Approach 1:
The patent optimizes the chemical structure and molecular weight of non-phthalate ester plasticizers to achieve appropriate viscosity and flexibility in the eraser compound. By carefully selecting plasticizer types and adjusting their content within specific ranges (15-40 parts by weight per 100 parts of vinyl chloride resin), the patent maintains hardness between 40-80 and erasing efficiency comparable to conventional erasers while eliminating environmental harm.
Solution Approach 2:
The patent creates a composite plasticizer system by combining non-phthalate ester plasticizers with specific vinyl chloride resin formulations and optional fillers. This composite approach ensures that the alternative plasticizers achieve the required mechanical properties and erasing performance that single-component systems failed to deliver.
3Ease of manufacture
If plasticizer content is increased to improve flexibility and erasing performance, then erasing performance improves, but hardness decreases excessively
Solution Approach 1:
The patent precisely controls the plasticizer content within the range of 15-40 parts by weight per 100 parts of vinyl chloride resin and adjusts the hardness of the vinyl chloride resin itself (15-30 on the Japanese Industrial Standard). This parameter optimization ensures the final eraser product achieves hardness between 40-80, balancing flexibility for effective erasing with sufficient hardness to avoid excessive softness.
4Strength
If plasticizer content is decreased to maintain hardness, then hardness is preserved, but erasing performance deteriorates
Solution Approach 1:
The patent simultaneously optimizes multiple parameters: plasticizer content (15-40 parts per 100 parts resin), vinyl chloride resin hardness (15-30 on JIS scale), and plasticizer molecular characteristics. This multi-parameter adjustment ensures that even at lower plasticizer concentrations, the eraser maintains adequate flexibility and erasing performance while achieving the target hardness range of 40-80.
Data Source
AI summary
The invention provides a plastic eraser comprising a vinyl chloride resin as a base resin and a combination of 4,5-epoxy-1,2-cyclohexanedicarboxylic acid bis(2-ethylhexyl) and diethylene glycol dibenzoate as plasticizers, wherein the plastic eraser comprises the base resin in an amount of 25-60% by weight, and the combination of plasticizers in an amount of 30-60% by weight, and wherein the proportion of the diethylene glycol dibenzoate in the combination of plasticizers is 5-60% by weight, and wherein the plastic eraser has a hardness in the range of 55-75, and a gel hardness in the range of 3.0-6.0 kgf.