Composite Ballistic-Resistant Material Dual Resin Layering
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Solution Overview
Problem
Existing ballistic-resistant materials face challenges in achieving a balance between hardness and comfort, as they are either too soft and penetrable or too hard and uncomfortable, due to the use of single resin systems in their construction.
Innovation Solution
A composite ballistic-resistant unit material is developed with intersecting layers of high-strength and high-modulus fibers, using two different resin adhesives with varying tensile moduli and loss moduli to achieve suitable hardness and improved ballistic-resistant performance, while maintaining comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single resin system is used in ballistic-resistant material, then the material structure is simple, but the material is either too soft (easily penetrated) or too hard (uncomfortable to wear)
Solution Approach 1:
The patent divides the resin system into multiple layers with different properties. Specifically, it uses a hard resin system (epoxy or polyester) in the first layer and a soft resin system (polyurethane or polyacrylic) in the second layer, creating a segmented structure that provides both hardness for penetration resistance and softness for comfort.
Solution Approach 2:
The patent applies different resin properties to different locations within the material structure. The hard resin is applied to the first layer that directly faces the bullet impact, while the soft resin is applied to the second layer that contacts the wearer's body, ensuring each location has the appropriate local quality for its function.
2Strength
If hard resin is used to improve penetration resistance, then ballistic-resistant performance improves, but wearability comfort deteriorates
Solution Approach 1:
The patent segments the resin application into two distinct layers: the first layer uses hard resin (epoxy or polyester) to provide penetration resistance, while the second layer uses soft resin (polyurethane or polyacrylic) to provide wearability comfort, thus resolving the contradiction between hardness and comfort.
Solution Approach 2:
The patent applies hard resin locally to the impact-facing first layer for penetration resistance, and soft resin locally to the wearer-contacting second layer for comfort, ensuring each region has the appropriate material quality for its specific function.
3Ease of operation
If soft resin is used to improve wearability comfort, then comfort improves, but penetration resistance deteriorates
Solution Approach 1:
The patent segments the resin system into two functional layers: the first layer uses hard resin (epoxy or polyester) to ensure penetration resistance, while the second layer uses soft resin (polyurethane or polyacrylic) to ensure wearability comfort, thus preventing the loss of either property.
Solution Approach 2:
The patent applies soft resin locally to the second layer that contacts the wearer's body for comfort, while maintaining hard resin in the first layer for penetration resistance, ensuring each location has the appropriate material quality without compromising overall performance.
4Strength
If multiple resin systems are used, then ballistic-resistant performance and comfort are balanced, but material structure complexity increases
Solution Approach 1:
The patent divides the material into exactly two layers with different resin systems, providing the necessary functional differentiation while maintaining a relatively simple segmented structure that is manageable in manufacturing and application.
Solution Approach 2:
The patent creates a dual-layer resin system where each layer serves multiple functions: the first layer provides both structural integrity and penetration resistance, while the second layer provides both comfort and additional bonding functionality, thus achieving multi-functionality with a relatively simple two-component structure.
Data Source
AI summary
Provided is a composite ballistic-resistant unit material, formed of an intersecting composite of N two layer structured units, 1≤N≥8, an organic thin film being attached to two sides thereof, the angle of intersection of each adjacent layer being 45°-90°; a first layer is a ballistic-resistant fibre unidirectional tape covered in a first resin adhesive, a second layer is a ballistic-resistant fibre unidirectional tape covered in a second resin adhesive, the tensile modulus of the first resin adhesive being lower than 6 MPa, and the tensile modulus of the second resin adhesive being higher than 6 MPa; the loss modulus of the first resin adhesive and the second resin adhesive, under the same conditions as the test frequency and strain value, at 30-40° C. is the same as the loss modulus of the ballistic-resistant fibre. When the strain sensitive rate of the ballistic-resistant fibre is at 2.4×103 s−1, the dynamic tensile stress is at least 2.4 GPa, and the sound-wave conduction speed is at least 10000 m/s. The composite ballistic-resistant unit material uses two kinds of resin adhesive, respectively coated onto adjacent layers, and the softness and hardness of ballistic-resistant materials produced therewith is appropriate, having excellent ballistic-resistant performance.