Multi-Layer PVC Textile Sheet for Heat-Resistant Color Stability
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Solution Overview
Problem
Conventional multilayer fabrics made of plasticized polyvinyl chloride (PVC) tend to yellow when exposed to elevated temperatures, limiting their use in vehicle instrument panels, especially when lighter colors are desired, as conventional PVC stabilizers fail to prevent this degradation.
Innovation Solution
The use of a top layer composed of at least 50% suspension polymerization process (S-PVC) with a combination of calcium hydroxide stabilizer and a Ca/Zn stabilizer, along with perchlorate, which provides improved color stability and resistance to yellowing, even at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional PVC stabilizers are used in multilayer fabrics, then the fabric can be processed and produced, but the fabric turns yellow when stored in heat at elevated temperatures
Solution Approach 1:
The patent changes the chemical composition parameters of the stabilizer system by incorporating specific phosphite compounds (e.g., tris(2,4-di-tert-butylphenyl) phosphite) in controlled amounts (0.1-5 parts by weight per 100 parts PVC) alongside conventional stabilizers. This parameter modification transforms the stabilizer's effectiveness at elevated temperatures, preventing yellowing while maintaining processingability.
Solution Approach 2:
The patent creates a composite stabilizer system combining multiple components: phosphite compounds, conventional stabilizers (such as calcium zinc stabilizers), and other additives. This composite approach synergistically improves high-temperature stability and color retention while preserving the fabric's processability through calendering and lamination.
2Reliability
If S-PVC is used in the top layer with calcium hydroxide stabilizer and Ca/Zn stabilizer, then color stability is improved and yellowing is reduced, but the processing complexity increases
Solution Approach 1:
The patent merges multiple stabilizing functions into a single composite stabilizer package that includes phosphite compounds, calcium hydroxide, and Ca/Zn stabilizers. This unified approach simplifies the formulation process while achieving superior color stability and yellowing resistance compared to using individual stabilizers separately.
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 solution significantly reduces the tendency of the fabric to yellow, maintaining a gray scale rating of ≥4 after storage at 120°C for two weeks, making it suitable for use as artificial leather in vehicle dashboards without the need for dark base colors.
Implementation Method 1
the polyvinyl chloride content in the top layer is at least 50% by weight based on a polyvinyl chloride, which was produced using the suspension polymerization process (S-PVC), and the composition for the top layer is one Calcium hydroxide stabilizer or a calcium hydroxide stabilizer and a Ca/Zn stabilizer
Implementation Method 2
the polyvinyl chloride content in the top layer is at least 50% by weight based on a polyvinyl chloride, which was produced using the suspension polymerization process (S-PVC)
Data Source
Figure 1
AI summary
The invention relates to a multi-layer fabric having at least one textile carrier layer (5), at least one foamed layer (3) made of plasticized polyvinyl chloride, at least one cover layer (2) made of plasticized polyvinyl chloride and at least one lacquer layer (1) pointing outwards on the cover layer . The invention also relates to a method for producing the multi-layer fabric and an interior trim part for a vehicle consisting of a fabric. For a reduced tendency to yellowing on heat storage and higher color stability, the polyvinyl chloride content in the top layer is based to at least 50% by weight on a polyvinyl chloride which was produced by the suspension polymerization process (S-PVC) and has the composition for the top layer a calcium hydroxide stabilizer and/or a Ca/Zn stabilizer containing 1 to 3% by weight of calcium and 1 to 2% by weight of zinc. The sheet can be made by a combination of reverse coating and calendering or extrusion processes.