PVC Surface Treatment Inhibits Plasticizer Release
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Solution Overview
Problem
Conventional PVC products release plasticizers into the environment under certain conditions, posing safety and environmental concerns, and environmentally friendly alternatives are expensive and less effective.
Innovation Solution
A two-step surface treatment process for PVC products using aqueous solutions of crosslinking agents and free radical initiators, along with phase transfer catalysts, to inhibit plasticizer release, which involves treating the PVC surface with a crosslinking agent and then a free radical initiator to form a second surface-treated product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional plasticizers are used in PVC products, then plasticization effect is achieved, but plasticizer release into environment occurs causing safety and environmental issues
Solution Approach 1:
The patent applies preliminary action by performing surface crosslinking treatment on the PVC product before it is exposed to conditions that would cause plasticizer release. The crosslinking agent is applied to the surface and cured to form a crosslinked structure that prevents plasticizer migration, addressing the harmful release issue before it occurs during product use.
Solution Approach 2:
The patent uses a crosslinking agent as an intermediary substance applied to the PVC surface. This crosslinking agent forms a crosslinked network structure that acts as a barrier between the plasticizer inside the PVC and the external environment, preventing plasticizer release while maintaining the plasticization effect.
2Object-generated harmful factors
If environmentally friendly plasticizers are used to replace conventional plasticizers, then safety and environmental issues are improved, but plasticization effect becomes insufficient and cost increases
Solution Approach 1:
The patent applies local quality by treating only the surface layer of the PVC product with the crosslinking agent, rather than modifying the entire bulk material. This localized surface treatment creates a crosslinked barrier layer that prevents plasticizer release, while the interior plasticizer composition can remain effective and environmentally friendly.
Solution Approach 2:
The patent creates a composite structure by combining the PVC matrix containing environmentally friendly plasticizers with a crosslinked surface layer. This composite approach allows the bulk material to use safe, environmentally friendly plasticizers while the surface crosslinked layer provides the additional function of preventing plasticizer migration.
3Object-generated harmful factors
If surface coating or barrier layer methods are used to inhibit plasticizer release, then plasticizer release is reduced, but local property variation occurs due to treatment area to product size ratio
Solution Approach 1:
The patent applies parameter changes by modifying the surface properties of the PVC product through chemical crosslinking rather than adding a separate coating layer. The crosslinking process changes the molecular structure and density of the surface layer, creating a barrier to plasticizer release while maintaining uniform properties across the entire surface without the variability associated with coating thickness.
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
Significantly reduces plasticizer release into the environment, maintaining the properties of PVC products while preventing environmental impact from organic solvents, with concentrations and temperatures optimized to achieve effective crosslinking without deformation.
Implementation Method 1
treating a surface of the PVC product by a first aqueous solution of a crosslinking agent and a first phase transfer catalyst to form a first surface treated PVC product
Implementation Method 2
treating a surface of the first surface treated PVC product by a second aqueous solution of an aqueous free radical initiator and a second phase transfer catalyst to form a second surface treated PVC product
Implementation Method 3
treating a surface of the PVC product by a first aqueous solution of a crosslinking agent and a first phase transfer catalyst
Data Source
AI summary
Disclosed is a method for treating a surface of a PVC product. A PVC product including PVC and plasticizer is provided. A surface of the PVC product is treated by an aqueous solution of a crosslinking agent and a first phase transfer catalyst to form a first surface treated PVC product. The surface of the first surface treated PVC product is treated by an aqueous solution of an aqueous free radical initiator and a second phase transfer catalyst to form a second surface treated PVC product. As such, the release of the plasticizer from the PVC product to an environment is inhibited.