Adhesive Resin Composition for Fluorine-Based Resins
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Solution Overview
Problem
Existing adhesive resin compositions face issues such as residual radical polymerization initiators affecting long-term resin properties, poor adhesiveness at lower temperatures, bleeding of epoxy compounds leading to adhesion failure, poor adhesion with polypropylene substrates, and insufficient adhesiveness with fluorine-based resins.
Innovation Solution
A polyethylene-based resin composition combined with a styrene-ethylene-butylene-styrene copolymer elastomer and an epoxy group-containing 1,2-polybutadiene component, optimized for adhesion with fluorine-based resins, using specific mass ratios and metallocene-catalyzed polyethylene to enhance adhesiveness and compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If melt-kneading is performed in the presence of a radical polymerization initiator to introduce epoxy groups into the resin, then epoxy group incorporation is achieved, but the initiator remains in the final adhesive resin composition causing property changes during long-term storage
Solution Approach 1:
The patent removes the harmful radical polymerization initiator from the system by using a different polymerization mechanism (ionic polymerization with cationic initiator) that does not leave residual harmful substances in the final adhesive resin composition, thereby ensuring long-term storage stability
Solution Approach 2:
The patent changes the polymerization parameters by switching from radical polymerization to ionic polymerization, using a cationic initiator instead of a radical initiator, which eliminates the problem of residual initiator causing property changes during storage
2Strength
If epoxy groups are partially introduced into the resin by radical polymerization, then epoxy functionality is achieved, but adhesiveness does not appear unless the temperature is in the vicinity of the melting temperature of the resin
Solution Approach 1:
The patent changes the chemical structure parameters by using ionic polymerization to introduce epoxy groups, which creates different molecular architecture and polarity compared to radical polymerization, enabling adhesiveness to manifest at lower temperatures without requiring melting point conditions
3Stability of the object's composition
If an epoxidized vegetable oil is used as an epoxy compound to provide epoxy functionality, then epoxy groups are introduced, but the oil immediately bleeds out when made into a film causing adhesion failure
Solution Approach 1:
The patent extracts the problematic low molecular weight epoxidized vegetable oil from the system and replaces it with a polyolefin resin having a specific structure that can be grafted with epoxy groups, eliminating the bleeding issue while maintaining epoxy functionality
Solution Approach 2:
The patent creates a composite material system combining polyolefin resin with grafted epoxy groups, achieving both the desired epoxy functionality and compositional stability without the bleeding problems associated with epoxidized vegetable oils
4Stability of the object's composition
If ethylene-based polymer accounts for 98.5 to 99.9 parts by mass to provide high polyethylene content, then polyethylene compatibility is achieved, but adhesiveness to polypropylene is poor
Solution Approach 1:
The patent applies local quality by maintaining high polyethylene content in the base resin while locally introducing epoxy groups through grafting onto specific sites of the polyolefin chain, creating regions with enhanced adhesiveness to polypropylene without compromising the overall polyethylene composition
Solution Approach 2:
The patent creates a composite material structure where epoxy-grafted polyolefin segments are distributed within the polyethylene matrix, providing localized adhesion promotion to polypropylene while maintaining the high polyethylene content for compatibility
5Strength
If modified olefin polymer with functional groups (carboxylic acid, epoxy, hydroxy, or isocyanate) is reacted with radically-polymerizable monomer to achieve adhesiveness with fluorine-based resin, then fluorine resin adhesion is improved, but adhesiveness with engineering plastic-based resins having amino, carboxyl or hydroxy groups is greatly reduced
Solution Approach 1:
The patent achieves universality by using epoxy groups as the primary functional moiety, which can form strong bonds with both fluorine-based resins and engineering plastic-based resins (polyamides, polyesters) through mechanisms such as ring-opening reactions with amino, carboxyl, and hydroxy groups, thereby providing broad adhesion compatibility
Solution Approach 2:
The patent changes the functional group parameter from specific groups like isocyanate or carboxylic acid to epoxy groups, which have superior reactivity and compatibility with multiple resin types including fluorine-based resins, polyamides, and polyesters, achieving both fluorine resin adhesion and versatility
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 composition provides strong adhesion between fluorine-based resins and other materials, improves adhesiveness across temperature ranges, and enhances water vapor barrier properties while preventing epoxy group ring opening, resulting in improved laminate strength and stability.
Implementation Method 1
a component (C) having an epoxy group and a vinyl group, wherein said component (C) having an epoxy group and a vinyl group is a component having an epoxy group partially introduced into 1,2-polybutadiene
Data Source
Figure 1~2
AI summary
The present invention provides an adhesive resin composition that is used for adhesion of a fluorine-based resin and is aimed at adhesion between fluorine-based resins or between a fluorine-based resin and a material other than a fluorine-based resin. More specifically, the present invention relates to an adhesive resin composition for use in adhesion of a fluorine-based resin, the composition including a polyethylene-based resin (A), an elastomer component (B), and a component (C) having an epoxy group and a vinyl group, wherein a content of the (A) is 55 parts by mass or more and 90 parts by mass or less, a content of the (B) is 10 parts by mass or more and 45 parts by mass or less, the (B) and the (C) have a common repetition unit, and a content of the (C) based on a total amount of 100 parts by mass of the (A) and the (B) is 0.1 parts by mass or more and 1.5 parts by mass or less.