Pressure-Sensitive Nitrile Rubber Blend for Chemical Resistance
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Solution Overview
Problem
Existing pressure-sensitive adhesives based on nitrile rubber face challenges in simultaneously improving adhesion and cohesion, particularly in applications requiring high chemical resistance and durability, such as in wearable electronic devices.
Innovation Solution
A pressure-sensitive adhesive comprising a specific blend of nitrile rubbers with varying acrylonitrile contents and an adhesive resin with aromatic structural elements, optimized for improved adhesion and cohesion, along with optional additives like plasticizers, fillers, and crosslinkers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the acrylonitrile content in nitrile rubber is increased to improve chemical resistance, then chemical resistance is improved, but adhesion deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully controlling the acrylonitrile content within the range of 18-30 wt% rather than using high acrylonitrile content rubber, and by optimizing the ratio of NBR to H-NBR to achieve the desired balance between chemical resistance and adhesion
Solution Approach 2:
The patent uses composite materials by combining NBR and H-NBR in specific ratios (70:30 to 30:70 wt%), creating a blended rubber system that synergistically provides both chemical resistance from H-NBR and adhesion from NBR
2Reliability
If the acrylonitrile content in nitrile rubber is increased to improve chemical resistance, then chemical resistance is improved, but cohesion deteriorates
Solution Approach 1:
The patent optimizes parameters by limiting acrylonitrile content to 18-30 wt% and controlling the NBR/H-NBR ratio to maintain cohesive strength while achieving chemical resistance
Solution Approach 2:
The blended rubber system of NBR and H-NBR creates a composite material that maintains cohesive integrity through the compatibility and synergistic interaction of the two rubber types
3Device complexity
If a single type of nitrile rubber is used to simplify formulation, then formulation complexity is reduced, but simultaneous improvement of adhesion and cohesion becomes difficult
Solution Approach 1:
The patent employs composite materials by formulating a blend of NBR and H-NBR rubbers, where each component contributes specific properties that together achieve both adhesion and cohesion requirements
Solution Approach 2:
The patent applies local quality by assigning different functional roles to different rubber components: NBR provides adhesion while H-NBR provides chemical resistance and cohesive strength, with each component optimized for its specific function
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 achieves enhanced adhesive strength, chemical resistance, and cohesion, meeting the demands of electronic devices by maintaining bond integrity under various chemical exposures.
Implementation Method 1
Pressure-sensitive adhesives have been around for a long time. Adhesives that allow a permanent bond to the substrate even under relatively light pressure
Implementation Method 2
The bondability and removability of pressure-sensitive adhesives are based on their adhesive and cohesive properties
Implementation Method 3
the adhesive resin component (b) contains at least one adhesive resin with aromatic structural elements
Implementation Method 4
Vulcanizates obtained from nitrile rubber—i.e., preparations with chemically crosslinked rubber—are highly resistant to fuels, oils, greases, and hydrocarbons
Data Source
Figure 1~3
AI summary
The invention relates to a pressure-sensitive adhesive based on nitrile rubber, a self-adhesive tape comprising the pressure-sensitive adhesive, and the use thereof. The pressure-sensitive adhesive according to the invention contains: (a) a nitrile rubber component; and (b) an adhesive resin component, wherein the nitrile rubber component (a) contains at least one first nitrile rubber N1 with an acrylonitrile content of at least 14% by weight and at most 22% by weight and at least one second nitrile rubber N2 with an acrylonitrile content of at least 25% by weight and at most 32% by weight, and the proportion of nitrile rubbers N1 and N2, based on the nitrile rubber component (a), is at least 90% by weight; and the adhesive resin component (b) contains at least one adhesive resin with aromatic structural elements having an MMAP of at most 40°C and a softening point of at least 85°C and at most 135°C.