Functional Resin Composition for Low-Temperature Adhesive Molding
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Solution Overview
Problem
Existing resin compositions face challenges in achieving both strong adhesive force and excellent tensile properties when bonding with synthetic resins and metals, particularly during injection molding, where high temperatures degrade physical properties while lower temperatures compromise adhesion.
Innovation Solution
A resin composition comprising a modified hydrogenated block copolymer with specific vinyl bonding amounts and functional groups, combined with acrylic-based block copolymers or thermoplastic polyurethane resins, exhibits a melt flow rate suitable for low-temperature injection molding, enhancing adhesive force and tensile properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If injection molding is performed at high temperature (260°C) to achieve excellent adhesive force, then adhesive force to metal and synthetic resin is improved, but tensile elongation and hue deteriorate
Solution Approach 1:
The invention changes the chemical composition parameters of the resin by incorporating a modified hydrogenated block copolymer with specific functional groups (carboxy, amino, hydroxy, or acid anhydride-derived groups) at controlled concentrations (0.01-5 mass%). This chemical parameter modification enables strong adhesion at lower processing temperatures, resolving the contradiction between adhesion strength and material property preservation.
Solution Approach 2:
The invention creates a composite resin system by blending the modified hydrogenated block copolymer with specific base polymers (polyolefin, polyester, or polyamide) in defined ratios. This composite approach combines the adhesion-enhancing functional groups with the mechanical strength of the base polymer, achieving both excellent adhesive force and tensile properties at lower molding temperatures.
2Reliability
If injection molding temperature is reduced to preserve tensile properties, then tensile elongation is maintained, but adhesive force is reduced
Solution Approach 1:
The invention modifies the chemical parameters of the resin composition by introducing functional groups through the modified hydrogenated block copolymer. These functional groups provide chemical reactivity that enhances adhesion at lower temperatures, allowing the process temperature to be reduced while maintaining both tensile properties and adhesive force.
3Strength
If high temperature processing is used to achieve strong adhesion, then adhesive force is improved, but physical properties such as flexibility and hue deteriorate
Solution Approach 1:
The invention changes the chemical composition by incorporating functional groups that provide adhesion enhancement at lower processing temperatures. This parameter modification allows achieving strong adhesion without subjecting the material to high temperatures that cause thermal degradation, thus preserving flexibility and hue.
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 resin composition maintains strong adhesive force and excellent tensile properties even at lower molding temperatures, preventing thermal degradation and improving flexibility and moldability.
Implementation Method 1
the modified hydrogenated product (A) has at least one functional group selected from the group consisting of a carboxy group, an amino group, a hydroxy group, and an acid anhydride-derived group
Implementation Method 2
a block copolymer having a styrene-based polymer block and a conjugated diene-based polymer block; and a hydrogenated product thereof
Data Source
AI summary
A resin composition that includes: a modified hydrogenated product (A) of a block copolymer comprising a polymer block (A-1) having a structural unit derived from an aromatic vinyl compound and a polymer block (A-2) having a structural unit derived from a conjugated diene compound, and a resin (B), in which the modified hydrogenated product (A) has at least one functional group selected from a carboxy group, an amino group, a hydroxy group, and an acid anhydride-derived group, and the polymer block (A-2) has a vinyl bonding amount of 50 to 99 mol %, the resin (B) is at least one selected from an acrylic-based block copolymer and a thermoplastic polyurethane resin, a mass ratio (A)/(B) of the modified hydrogenated product (A) to the resin (B) is 90/10 to 10/90, and a melt flow rate measured under conditions of a temperature of 230° C. and a load of 21 N in accordance with JIS K7210:2014 is 5 g/10 minutes or more.