Sealing element
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Solution Overview
Problem
Existing sealing materials for synthetic roofing membranes lack UV stability, high-temperature resistance, and microbiological resistance, and are not phthalate-free, making them unsuitable for long-term use and exposure to various temperature zones.
Innovation Solution
A phthalate-free sealing membrane composition comprising PVC, biobased plasticizers such as citric acid or pentaerythritol-based esters, fillers, stabilizers, biocides, and UV stabilizers, with optional reinforcement layers and foamed PVC layers for enhanced durability and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sealing materials are used for synthetic roofing membranes, then they provide basic sealing functionality, but they lack UV stability, high-temperature resistance, and microbiological resistance, and contain harmful phthalates
Solution Approach 1:
The patent removes harmful phthalates from the sealing membrane composition and replaces them with alternative plasticizers and stabilizers. The formulation explicitly excludes phthalates while incorporating UV stabilizers, high-temperature stabilizers, and biocides to maintain or improve performance without the harmful substances.
Solution Approach 2:
The patent employs a composite formulation combining multiple functional components: base polymer (PVC), plasticizers (phthalate-free alternatives), UV stabilizers, high-temperature stabilizers, biocides, and fillers. This composite approach allows simultaneous achievement of UV stability, heat resistance, microbiological resistance, and phthalate-free composition.
2Duration of action of stationary object
If sealing membranes are designed for long-term exposure to various temperature zones, then they require enhanced thermal stability and durability, but conventional materials degrade under high-temperature conditions
Solution Approach 1:
The patent modifies the chemical composition parameters by incorporating specific stabilizers designed to maintain material properties at elevated temperatures. The formulation includes high-temperature stabilizers that prevent degradation and maintain structural integrity across a wide temperature range, enabling long-term service life in varying thermal conditions.
3Object-affected harmful factors
If biobased plasticizers are used to replace phthalates, then environmental compliance is improved, but the composition requires additional stabilizers and biocides to maintain performance
Solution Approach 1:
The patent employs multi-functional additives that perform multiple roles simultaneously. For example, certain stabilizers provide both UV protection and high-temperature stability, while biocides also contribute to overall material preservation. This reduces the need for separate dedicated additives for each function, thereby minimizing the total number of components despite the phthalate-free requirement.
Data Source
AI summary
The invention relates to a sealing element comprising at least 20-60 wt % of PVC resin, and 20-45 wt % of a biobased plasticizer.