Thermoplastic Polyolefin Elastomer Sheet for Water-Based Coating Adhesion
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Solution Overview
Problem
Thermoelastic polyolefin-based elastomer sheets used for vehicular coatings face issues with low adhesion with aqueous coating materials and low elongation, which affect their performance in terms of friction resistance, abrasion resistance, and light resistance.
Innovation Solution
A composition comprising partially crosslinked thermoelastic polyolefin-based elastomer resin, non-crosslinked thermoelastic polyolefin-based elastomer resin, polypropylene resin, ethylene octene rubber resin, linear low density polyethylene resin, polyethylene master batch with a lubricant, and an inorganic filler, optimized in specific weight percentages and properties to enhance melt strength, adhesion, and molding properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If flame, ozone, plasma, or chlorinated polyolefin resin-based primer treatment is applied to improve adhesion, then adhesion property is improved, but process complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the adhesion-promoting function from separate surface treatment processes and integrates it into the elastomer composition itself through silane-modified polyolefin resin. The silane groups provide inherent adhesion capability without requiring external treatment processes, thereby eliminating the need for flame, ozone, or plasma treatment while maintaining strong adhesion to substrates and coating materials.
Solution Approach 2:
The silane-modified polyolefin resin acts as an intermediary that bridges the non-polar polyolefin matrix and the polar coating materials or substrates. The silane groups on the resin surface provide chemical bonding capability with substrates and compatibility with coating materials, while the polyolefin backbone maintains the elastomer's inherent properties, thus improving adhesion without complex surface treatment.
2Temperature
If crosslinking is increased to improve heat resistance and adhesion, then heat resistance and adhesion are improved, but elongation decreases
Solution Approach 1:
The patent carefully controls the degree of crosslinking at 30-70% rather than full crosslinking, optimizing the balance between heat resistance and elongation. This partial crosslinking level provides sufficient thermal stability and adhesion while retaining enough polymer chain mobility to maintain acceptable elongation properties. The specific crosslinking density is tuned to achieve the desired property balance.
Solution Approach 2:
The patent creates a composite structure within the elastomer composition by combining silane-modified polyolefin resin with unmodified polyolefin resin and other additives. The crosslinked silane-modified resin provides heat resistance and adhesion, while the unmodified resin and plasticizers maintain flexibility and elongation, achieving a balance through compositional design.
3Strength
If silane-modified polyolefin resin is used to improve adhesion with aqueous coating material, then adhesion is improved, but moisture sensitivity may increase
Solution Approach 1:
The patent converts the potential harm of moisture sensitivity into a benefit by utilizing the silane groups' ability to undergo hydrolysis and condensation reactions. The silane-modified polyolefin resin reacts with moisture during curing to form crosslinked structures that enhance adhesion. The controlled crosslinking (30-70%) ensures that moisture-induced reactions improve adhesion rather than causing degradation, transforming a potential reliability issue into an adhesion-enhancing mechanism.
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 exhibits improved humidity resistance, chemical resistance, light aging resistance, and heat resistance, making it suitable for use in vehicular coatings, particularly for crash pads, with enhanced product appearance and reduced odor issues.
Implementation Method 1
it is particularly effective in that silane-modified polyolefin-based elastomer resin undergoes crosslinking reaction
Implementation Method 2
polyethylene master batch with a lubricant
Data Source
AI summary
The present invention relates to a thermoelastic polyolefin-based elastomer sheet composition for water based coating treatment, which comprises a partially crosslinked thermoelastic polyolefin-based elastomer resin, a non-crosslinked thermoelastic polyolefin-based elastomer resin, a polypropylene resin, an ethylene octene rubber resin, a linear low density polyethylene resin, polyethylene master batch containing a lubricant, and an inorganic filler, the composition being useful for vehicular inner parts (e.g., crash pad) due to its superior elongation, heat resistance, humidity resistance and molding property.