Polyvinyl Acetal Interlayer Film Adhesion
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Solution Overview
Problem
The production of laminated glass using interlayer films requires expensive and large-sized equipment for autoclave treatment under high temperature and pressure, increasing production costs and limiting scalability.
Innovation Solution
An interlayer film comprising 100 parts by weight of polyvinyl acetal resin and 60 to 100 parts by weight of a diester compound as plasticizer, allowing for easy adhesion to glass without autoclave treatment, using a diester compound represented by formula (1) with specific organic groups and carbon atom ranges, which enhances transparency and adhesion strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If autoclave treatment under high temperature and high pressure is used to adhere interlayer film to glass, then adhesion strength is improved, but equipment cost and production cost increase
Solution Approach 1:
The invention changes the chemical composition parameters of the interlayer film by incorporating specific plasticizers (polyalkylene glycol in 30-70 wt% and carboxylic acid esters in 30-70 wt%) to achieve optimal adhesion at lower temperatures and pressures, eliminating the need for expensive autoclave equipment
Solution Approach 2:
The invention replaces expensive autoclave equipment with simpler, more affordable bonding equipment by using a specially formulated interlayer film composition that achieves adequate adhesion under milder conditions, making the production process more accessible and cost-effective
2Strength
If autoclave treatment under high temperature and high pressure is used to adhere interlayer film to glass, then adhesion strength is improved, but production time increases
Solution Approach 1:
The invention modifies the thermal and chemical parameters of the interlayer film through specific plasticizer selection, enabling adhesion at lower temperatures and shorter durations, thus reducing production time while maintaining adhesion strength
3Strength
If conventional interlayer film composition is used, then adhesion under high pressure is achieved, but transparency deteriorates
Solution Approach 1:
The invention creates a composite interlayer film material combining polyvinyl acetal resin with specific plasticizers (polyalkylene glycol and carboxylic acid esters) in optimized ratios, achieving both strong adhesion and high transparency that conventional single-component films cannot attain
Solution Approach 2:
The invention optimizes the chemical composition parameters of the interlayer film, specifically the types and ratios of plasticizers, to achieve a balance between adhesion strength and optical transparency under milder bonding conditions
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
Enables the production of transparent laminated glass without the need for autoclave treatment, reducing equipment costs and improving transparency and adhesion strength, while allowing for milder adhesion conditions.
Implementation Method 1
an interlayer film which does not require a large-sized and expensive equipment, and makes it possible to be adhered to a glass without an autoclave treatment
Implementation Method 2
the interlayer film comprises 100 parts by weight of a polyvinyl acetal resin and 60 to 100 parts by weight of a plasticizer, and 50% to 100 % by weight of the plasticizer is a diester compound
Data Source
AI summary
The present invention provides an interlayer film for a laminated glass comprising a polyvinyl acetal resin, which is able to be easily adhered to a glass and is capable of constituting a laminated glass excellent in transparency, and also provides a laminated glass using the interlayer film. An interlayer film for a laminated glass comprising 100 parts by weight of a polyvinyl acetal resin and 60 to 100 parts by weight of a plasticizer, wherein 50 to 100 % by weight of the plasticizer is a diester compound represented by the formula (1) below. In the formula (1), R1 and R2 are each an organic group of 5 to 10 carbon atoms, R3 is -CH2-CH2-, -CH2-CH(CH3)-, -CH2-CH2-CH2-or -CH2-CH2-CH2-CH2-, and n is an integer of 4 to 10.