Polyurethane-Acrylic Adhesive for Zipper Bag Thermal Stability
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Solution Overview
Problem
Conventional waterborne adhesives cannot withstand the high temperatures required for producing zipper bags, leading to tunnel formation in the zipper area.
Innovation Solution
An adhesive composition comprising a mixture of polyurethane dispersion and acrylic emulsion, along with a polyisocyanate, which provides the necessary thermal stability and bonding strength for zipper bag applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional waterborne adhesive is used for zipper bag application, then the adhesive can be applied to general performance applications, but it cannot withstand high temperature (210°C) during zipper production, causing tunnel formation
Solution Approach 1:
The patent combines polyurethane dispersion and acrylic emulsion to create a composite adhesive system. The polyurethane dispersion provides high-temperature resistance while the acrylic emulsion contributes to adhesion performance. This composite approach allows the adhesive to withstand 210°C during zipper production without forming tunnels, resolving the contradiction between temperature resistance and reliability.
Solution Approach 2:
The patent modifies the adhesive composition by incorporating specific components with defined glass transition temperatures (Tg). The polyurethane dispersion has a Tg of -15°C to 15°C and the acrylic emulsion has a Tg of -10°C to 25°C. By controlling these thermal parameters and their ratios (15:85 to 85:15), the adhesive achieves both high-temperature withstand capability and tunnel prevention.
2Temperature
If solventless or solvent based adhesive is used for zipper bag application, then the adhesive can withstand high temperature, but the requirement for waterborne adhesive (environmental friendliness) cannot be met
Solution Approach 1:
The patent creates a waterborne adhesive composite using polyurethane dispersion and acrylic emulsion. This composite structure enables the adhesive to maintain waterborne characteristics (environmental friendliness) while achieving high-temperature resistance comparable to solventless or solvent-based adhesives. The synergistic combination allows waterborne adhesive to be applicable to zipper bag production.
Solution Approach 2:
The patent changes the chemical composition parameters by selecting specific polyurethane and acrylic components with appropriate molecular weights, functional groups, and glass transition temperatures. The polyurethane dispersion contains 30-50% monomeric diisocyanate, 45-69% polymeric polyol, and 1-15% ionic surfactant. These parameter adjustments enable the waterborne adhesive to achieve the thermal stability required for zipper applications.
3Strength
If polyurethane dispersion and acrylic emulsion are combined in specific ratios, then the adhesive achieves optimal thermal stability and bonding strength, but the formulation complexity increases
Solution Approach 1:
The patent establishes specific parameter ranges for the adhesive formulation: polyurethane dispersion to acrylic emulsion ratio of 15:85 to 85:15, polyurethane dispersion composition (30-50% monomeric diisocyanate, 45-69% polymeric polyol, 1-15% ionic surfactant), and glass transition temperature ranges. By defining these parameters, the patent simplifies the formulation process while achieving optimal bonding strength and thermal stability.
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 adhesive composition effectively withstands high temperatures during the zipper bag production process, preventing tunnel formation and ensuring strong bonding and heat resistance.
Implementation Method 1
the polyurethane dispersion has a Tg of −15° C. to 15° C., and the acrylic emulsion has a Tg of −10° C. to 25° C.
Implementation Method 2
the adhesive composition effectively withstands high temperatures during the zipper bag production process, preventing tunnel formation
Data Source
AI summary
An adhesive composition is provided. The adhesive composition for zipper bag application, comprising the following components: (a) a mixture of a polyurethane dispersion with acrylic emulsion, wherein the polyurethane dispersion comprises a reaction product of by dry weight based on total dry weight of the polyurethane dispersion, from 30% to 50% of a monomeric diisocyanate, from 45% to 69% of a polymeric polyol and from 1% to 15% of ionic surfactant, the polyurethane dispersion has a Tg of −15° C. to 15° C., and the acrylic emulsion has a Tg of −10° C. to 25° C., and wherein the ratio by weight of the polyurethane dispersion and the acrylic emulsion is from 15:85 to 85:15, (b) a polyisocyanate.