PVC Artificial Leather Sheet Using DPHP and DINA Plasticizers
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Solution Overview
Problem
Conventional artificial leathers face issues with cold resistance, softness, tensile elongation, and stiffness, and are often made with phthalate-based plasticizers that are toxic and harmful to humans, leading to regulatory bans and environmental concerns.
Innovation Solution
An artificial leather sheet is developed using a polyvinyl chloride (PVC) based composition with bis-(2-propylheptyl) phthalate (DPHP) and di-isononyl adipate (DINA) as plasticizers, combined with a foaming layer and surface treatment layer, which provides excellent cold resistance, softness, and tensile elongation while being non-toxic and human-friendly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional artificial leather is manufactured using phthalate-based plasticizers, then manufacturing cost is reduced and processing is simplified, but the product becomes toxic and harmful to humans
Solution Approach 1:
The patent changes the chemical composition parameters by replacing phthalate-based plasticizers with non-phthalate alternatives (specifically di-isononyl adipate and bis(2-propylheptyl) phthalate). This substitution maintains the plasticizing function while eliminating the toxic harmful factors, resolving the contradiction between ease of manufacture and toxicity.
Solution Approach 2:
The patent uses a composite plasticizer system combining di-isononyl adipate and bis(2-propylheptyl) phthalate in specific ratios. This composite approach provides both the necessary plasticizing effect for easy manufacturing and the safety profile required to eliminate toxicity concerns.
2Strength
If plasticizers are used in conventional artificial leather, then softness is improved, but cold resistance deteriorates at temperatures below −30° C.
Solution Approach 1:
The patent changes the chemical structure parameters of the plasticizer by selecting di-isononyl adipate and bis(2-propylheptyl) phthalate with specific molecular characteristics. These plasticizers maintain flexibility and softness at low temperatures unlike conventional phthalates, thus improving cold resistance while preserving softness.
3Object-affected harmful factors
If plasticizing rate is reduced in artificial leather, then TVOC emission is decreased, but softness and tensile elongation deteriorate
Solution Approach 1:
The patent changes the chemical composition by using non-phthalate plasticizers with different volatility characteristics. The selected plasticizers (di-isononyl adipate and bis(2-propylheptyl) phthalate) provide adequate plasticizing effect at lower concentrations, reducing TVOC emissions while maintaining softness and tensile elongation properties.
Data Source
AI summary
An artificial leather sheet includes a substrate layer, a foaming layer formed on upper surfaces of the substrate layer, a surface layer formed on upper surfaces of the foaming layer, and a surface treatment layer formed on upper surfaces of the surface layer. The foaming layer includes a polyvinyl chloride resin, a plasticizer, a foaming agent, and a stabilizer. The surface layer includes the polyvinyl chloride resin, the plasticizer, and the stabilizer. The plasticizer is bis-(2-propylheptyl) phthalate (DPHP) and di-isononyl adipate (DINA).