Ethylene Copolymer Plastisol Composition for Low-Migration PVC
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Solution Overview
Problem
Conventional liquid plasticizers used in PVC plastisols have low molecular weights, leading to migration and evaporation issues, resulting in brittle PVC products over time, and existing high molecular weight plasticizers face challenges in processing and stability against aging and UV exposure.
Innovation Solution
A free-flowing plasticized halogenated polymer plastisol composition is developed, comprising a combination of high molecular weight solid ethylene copolymer plasticizers and low molecular weight liquid plasticizers, with the ethylene copolymer being miscible with the halogenated polymer, and the process involves mixing these plasticizers with a nonporous halogenated polymer powder to create a stable and flexible PVC product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional low molecular weight liquid plasticizers are used, then the PVC becomes flexible and processable, but the plasticizer migrates and evaporates over time causing the product to become brittle
Solution Approach 1:
The invention uses a composite plasticizer system combining low molecular weight liquid plasticizers with high molecular weight polymeric plasticizers (polyester polyols with molecular weights of 10,000-100,000). The liquid plasticizer provides initial flexibility and processing, while the polymeric plasticizer remains stationary and prevents migration and evaporation, creating a synergistic effect that resolves the contradiction between ease of operation and long-term reliability.
2Reliability
If high molecular weight polymeric plasticizers are used, then migration and evaporation are reduced, but processing difficulty and instability against aging and UV increase
Solution Approach 1:
The invention merges the advantages of both low and high molecular weight plasticizers into a single composite system. The low molecular weight plasticizer ensures good processing and initial flexibility, while the high molecular weight polymeric plasticizer provides long-term stability and prevents migration. This combination resolves the contradiction by allowing each component to perform its optimal function without the drawbacks of using either alone.
3Reliability
If high molecular weight polymeric plasticizers are used, then plasticizer migration is reduced, but the product shows increased fragility and reduced mechanical properties
Solution Approach 1:
The invention changes the molecular weight parameter of the plasticizer system by using a broad distribution including both low molecular weight (for flexibility) and high molecular weight (for migration resistance) components. The polymeric plasticizers have molecular weights specifically selected in the range of 10,000-100,000 to optimize the balance between migration resistance and maintaining mechanical properties, resolving the contradiction between reliability and strength.
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 modified plasticizer composition significantly reduces plasticizer migration, enhances chemical resistance, mechanical properties, and improves aging stability, producing flexible PVC products with improved durability and resistance to punctures and tears.
Implementation Method 1
a high molecular weight solid ethylene copolymer plasticizer for halogenated polymer that is miscible with the halogenated polymer
Implementation Method 2
the solid ethylene-containing copolymer plasticizer is soluble in the liquid plasticizer
Implementation Method 3
Above the Tg for the composition, the small PVC particles begin to absorb the plasticizer molecules
Data Source
AI summary
Provided herein is a plastisol composition comprising a halogenated polymer and an ethylene carbon monoxide copolymer that is dispersed or dissolved in a liquid plasticizer. A process for producing the plastisol composition is further provided.