Hydrogenated Block Copolymer Resin for Human Body Models
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Solution Overview
Problem
Existing thermoplastic elastomer compositions for human body models suffer from issues such as stickiness, poor dispersion, and inability to replicate the specific gravity and texture of human skin or organs, leading to inadequate durability for repeated medical simulations.
Innovation Solution
A compound resin is developed by blending a hydrogenated block copolymer with a specific structure and a predetermined amount of oil, achieving a specific gravity close to that of human bodies and providing a texture similar to human skin or organs, along with high durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a high-viscosity oil is used as a softening agent for non-aromatic rubber, then the thermoplastic elastomer composition becomes softer, but the composition becomes sticky after kneading and turns into a hard composition, failing to provide a human skin-like texture
Solution Approach 1:
The patent changes the key parameter of oil viscosity from high-viscosity to low-viscosity (kinematic viscosity at 40°C of 25 mm²/s or less). This parameter change allows the oil to effectively soften the thermoplastic elastomer composition without causing stickiness or hardening after kneading, thereby achieving a human skin-like texture.
2Strength
If the blending ratio of oil in a thermoplastic elastomer is increased to improve softness, then the composition becomes more difficult to knead, resulting in poor dispersion of the thermoplastic elastomer
Solution Approach 1:
The patent changes the viscosity parameter of the oil to 25 mm²/s or less at 40°C, which maintains good kneadability even at high blending ratios (450-1500 parts by mass per 100 parts of hydrogenated block copolymer). This allows effective softening without compromising the ease of manufacturing.
3Strength
If polyurethane is used for human body models to achieve a skin-like texture, then the texture resembles human skin, but the specific gravity is 1.2 which is higher than that of human bodies or organs, failing to reproduce the actual massive feeling
Solution Approach 1:
The patent uses a composite material system consisting of a hydrogenated block copolymer and a low-viscosity oil. This composite achieves both the desired skin-like texture and a specific gravity close to that of human bodies, overcoming the limitation of polyurethane which has high specific gravity despite good texture.
4Adaptability or versatility
If human body models are used for exercise implements for medical practice or medical treatment, then the models are repeatedly used, but they require improved durability
Solution Approach 1:
The patent changes the oil viscosity parameter to 25 mm²/s or less at 40°C, which prevents the composition from becoming sticky or hard after kneading. This ensures consistent mechanical properties and high durability, enabling repeated use in medical practice and treatment applications.
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 compound resin effectively replicates the specific gravity and texture of human bodies, offering high durability and improved moldability, making it suitable for human body models, especially for medical phantoms and simulators.
Implementation Method 1
blending a hydrogenated block copolymer having a specific structure with a predetermined oil in a predetermined amount
Data Source
AI summary
Provided are: a compound resin containing a hydrogenated block copolymer (X) that is a hydrogenated product of a block copolymer having a polymer block (A) mainly composed of a structural unit derived from an aromatic vinyl compound and a polymer block (B) mainly composed of a structural unit derived from a conjugated diene compound, at least one terminal of which is formed of the polymer block (A), and an oil (Y) having a kinematic viscosity at 40° C. of 25 mm2/s or less, the content of the oil (Y) relative to 100 parts by mass of the hydrogenated block copolymer (X) being 450 to 1,500 parts by mass; and a human body model containing the compound resin.