Lightweight Bat Resolving Weight-Strength Trade-Off
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Solution Overview
Problem
Existing lightweight baseball bats are prone to deformation and cracking due to poor strength and toughness, resulting in a short service life.
Innovation Solution
A lightweight high-strength bat is developed using a hollow fiber bat main body layer coated with an epoxy structural adhesive film, combined with Biaxially Oriented Polypropylene (BOPP) and fiber layers, which enhances bonding force and toughness through a specific composition and preparation method involving bisphenol A epoxy resin, nitrile rubber, and epoxidized polybutadiene liquid rubber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the bat is made lightweight, then the swing speed and player performance are improved, but the strength and toughness deteriorate, causing deformation and cracking
Solution Approach 1:
The patent employs composite materials by combining fiber prepreg cloth (providing structural strength) with epoxy structural adhesive film containing rubber modifiers (providing toughness and crack resistance). This composite structure allows the bat to maintain lightweight properties while achieving high strength and toughness, resolving the contradiction between weight reduction and strength maintenance.
Solution Approach 2:
The patent modifies the epoxy adhesive by incorporating specific ratios of solid nitrile rubber (5-10 parts), liquid carboxyl-terminated nitrile rubber (10-20 parts), and epoxidized polybutadiene liquid rubber (10-20 parts). These parameter changes in material composition enhance the toughness and impact resistance of the lightweight bat structure, preventing deformation and cracking while maintaining low weight.
2Ease of manufacture
If the bat structure is simplified for lightweight construction, then manufacturing ease is improved, but the service life deteriorates due to poor strength
Solution Approach 1:
The patent uses fiber prepreg cloth that has been pre-impregnated with resin before forming the bat structure. This preliminary action ensures uniform material distribution and bonding, creating a reliable composite structure that resists deformation and cracking during service, thereby extending service life while maintaining manufacturing simplicity.
Solution Approach 2:
The patent creates a nested structure where the fiber prepreg cloth is embedded within the epoxy structural adhesive film. This nested arrangement provides multiple layers of structural support and damage resistance, enhancing reliability and service life without significantly complicating the manufacturing process.
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 bat achieves improved strength and toughness, resisting deformation and cracking, with enhanced bonding between layers that absorbs energy and maintains cohesion, leading to a longer-lasting product.
Implementation Method 1
a tough layer formed by coating a surface of the fiber bat main body layer with an epoxy structural adhesive film
Implementation Method 2
5-10% of solid nitrile rubber, 10-20% of liquid carboxyl-terminated nitrile rubber, 10-20% of epoxidized polybutadiene liquid rubber
Implementation Method 3
enhanced bonding force and toughness through a specific composition and preparation method
Implementation Method 4
the fiber bat main body layer is formed by coating a bat core rod with fiber prepreg cloth
Data Source
AI summary
Disclosed is a lightweight high-strength bat and a preparation method therefor, including a hollow fiber bat main body layer and a tough layer, where the epoxy structural adhesive film is prepared from the following raw materials in parts by weight: 45-65% of bisphenol A epoxy resin, 5-10% of p-aminophenol triglycidyl amine, 4-6% of dicyandiamide, 2-4% of an organic urea accelerator, 1-5% of a KH560 silane coupling agent, 5-10% of solid nitrile rubber, 7-15% of liquid carboxyl-terminated nitrile rubber, 7-15% of epoxidized polybutadiene liquid rubber, and 1-5% of 8-hydroxyquinoline. The high-strength fiber layer serves as a main body structure layer and is light, then the epoxy structural adhesive film is adopted to coat the main body layer of the fiber bat, an epoxy structural adhesive can permeate into the fiber layer, a bonding force between the layers is enhanced, and the strength of the bat is further improved.