Heat Ray Shielding Adhesive Sheet with Controlled Microparticles
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Solution Overview
Problem
Conventional heat ray shielding adhesive sheets for windows have limitations in transparency, haze, and manufacturing complexity, with existing solutions either compromising on transparency or requiring multiple film-forming steps.
Innovation Solution
A heat-ray-shielding-adhesive composition is developed by dispersing heat-ray-shielding microparticles with controlled primary particle diameter, specific surface area, and X-ray diffraction characteristics in an acrylic copolymer adhesive, which is then applied to create a transparent adhesive sheet with improved transparency and haze, and simplified manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If heat-ray-shielding microparticles are added to adhesive to simplify manufacturing, then manufacturing complexity is reduced, but transparency and haze performance are insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle diameter (1-100 nm), specific surface area (5-200 m²/g), and crystallinity (half-value width 0.01-0.80°) of heat-ray-shielding microparticles. By optimizing these parameters, the invention achieves both simplified manufacturing (single-layer adhesive application) and improved transparency/haze performance, resolving the technical contradiction between ease of manufacture and optical quality.
2Object-affected harmful factors
If conventional heat ray shielding methods using sputtering or vapor deposition are used, then heat ray shielding performance is achieved, but manufacturing complexity increases due to multiple film-forming steps
Solution Approach 1:
The patent merges the heat-ray-shielding function and adhesive function into a single composite adhesive layer. Heat-ray-shielding microparticles are dispersed in an adhesive matrix, combining what were previously separate layers (heat-ray-shielding layer + adhesive layer) into one integrated layer, thereby reducing the number of film-forming steps while maintaining heat ray shielding performance.
Solution Approach 2:
The adhesive composition serves multiple functions simultaneously: it provides adhesion, maintains transparency, reduces haze, and shields heat rays. The microparticle-dispersed adhesive layer is universally functional, eliminating the need for separate specialized layers for each function, thus simplifying the overall manufacturing process.
3Ease of manufacture
If existing heat ray shielding adhesives are used, then manufacturing is simplified, but transparency in visible light range and haze are insufficient
Solution Approach 1:
The patent achieves improved transparency and reduced haze while maintaining manufacturing simplicity through parameter changes in the microparticles: diameter of 1-100 nm, specific surface area of 5-200 m²/g, and half-value width of 0.01-0.80°. These optimized parameters enable the microparticles to shield heat rays effectively while minimizing impact on visible light transmission and haze, resolving the contradiction between ease of manufacture and optical performance.
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 solution achieves excellent heat ray shielding performance with high transparency and low haze, reducing heating costs in winter and cooling costs in summer while simplifying the manufacturing process.
Implementation Method 1
adding a substance having an optical selective absorption characteristic to an adhesive to manufacture an adhesive film having an optical selective absorption characteristic
Implementation Method 2
endowed with the property of reflecting or absorbing heat rays (infrared rays)
Implementation Method 3
the half-value width of a first main peak obtained by an X-ray diffraction pattern
Implementation Method 4
the half-value width of a first main peak obtained by an X-ray diffraction pattern (XRD pattern) of the microparticles
Data Source
AI summary
[Problem] The present invention relates to: a heat ray shielding adhesive which is used in bonding to a windowpane and the like and shields heat rays; a heat ray shielding transparent adhesive sheet; and a method for producing the heat ray shielding adhesive. The present invention provides a heat ray shielding transparent adhesive sheet which has high transmittance in the visible light region, low haze and more excellent transparency.[Solution] Transparency and heat ray shielding properties can be imparted in a simpler manner by using a heat ray shielding adhesive composition which contains fine heat ray shielding particles that have a half-value width of the first main peak of from 0.01° to 0.80° (inclusive) as determined by X-ray diffraction pattern, and a heat ray shielding transparent adhesive sheet is therefore able to be produced at low cost.