Plastisol Composition for Metal Sealing with Low-Temperature Curing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing plastisol compositions for sealing metal parts face challenges in achieving flexible, lightweight, easy-to-handle formulations with good aging properties and low curing temperatures, along with inadequate adhesion to metallic substrates and limited flexibility in production processes.
Innovation Solution
A plastisol composition comprising 20-40 wt% PVC-based polymer, 20-50 wt% plasticizers, and 0.5-5 wt% amino and/or amido-functional compounds or blocked polyurethanes, with a suspension-type PVC co-polymer containing 10-16% vinyl acetate units, which allows for low-temperature curing and enhanced adhesion to metal substrates, improved aging properties, and reduced density through the use of additives like microspheres.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional plastisol compositions are used for sealing metal parts, then good adhesion to metal substrates is achieved, but the compositions require high curing temperatures and have limited flexibility in production processes
Solution Approach 1:
The patent modifies the chemical composition parameters of the plastisol by incorporating specific reactive additives (aminoplasts, polyaminoamides, polyurethanes) in controlled amounts (0.1-5 wt%), which changes the curing mechanism to enable low-temperature curing (100-150°C) while maintaining adhesion to metal substrates
Solution Approach 2:
The patent creates a composite plastisol formulation combining PVC-based polymer (20-40 wt%), plasticizers (20-50 wt%), and multiple types of reactive additives (aminoplasts, polyaminoamides, polyurethanes) in specific proportions, which synergistically provide both low-temperature curability and good adhesion properties
2Reliability
If adhesion promoters are added to improve adhesion to metal substrates, then long-term adhesion is achieved, but the composition requires specific ester types which reduces production flexibility
Solution Approach 1:
The patent uses reactive additives that serve multiple functions simultaneously: they act as adhesion promoters for metal substrates, enable low-temperature curing, and provide crosslinking functionality. This multi-functionality eliminates the need for specific ester types while achieving reliable adhesion
Solution Approach 2:
The patent changes the approach from using specific ester types as adhesion promoters to using reactive additives (aminoplasts, polyaminoamides, polyurethanes) that provide adhesion through chemical bonding mechanisms, thereby expanding production flexibility while maintaining adhesion reliability
3Reliability
If conventional plastisol compositions are used, then good sealing properties are achieved, but the cured plastisol has high density which is not desirable for lightweight applications
Solution Approach 1:
The patent modifies the plastisol composition by incorporating lightweight fillers and controlling the plasticizer-to-polymer ratio, which reduces the density of the cured plastisol while maintaining sealing properties through the crosslinking network formed by reactive additives
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 achieves effective adhesion to metal substrates, improved aging properties, and reduced density, enabling flexible application and curing at temperatures between 120°C and 140°C, while maintaining mechanical integrity and reducing environmental impact.
Implementation Method 1
The plastisol compositions have the property to gel upon heating to higher temperature
Implementation Method 2
amino and/or amido-functional compounds and/or blocked polyurethanes as reactive additives
Data Source
AI summary
The invention relates to a plastisol composition suitable for sealing of metal parts comprising PVC, plasticizers, reactive additives based on amino and/or amido-functional compounds and/or blocked polyurethanes. The invention further relates to a process for producing plastisol compositions comprising the steps of a polymerizing vinyl chloride and co-monomers and combining them with plasticizers, amino and/or amido-functional compounds and/or blocked polyurethanes.