Citrate Plasticizer Blend for Low Migration and Volatile Loss
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Solution Overview
Problem
Existing plasticizers, such as di(2-ethylhexyl) terephthalate (DEHTP) and tri(2-ethylhexyl) trimellitate, suffer from poor plasticization efficiency, high volatile loss, and thermal instability, while secondary plasticizers often lead to unpredictable changes in physical properties and increased costs.
Innovation Solution
A citrate-based plasticizer composition is developed, combining citrates derived from C5 and C8 alcohols, including n-pentanol, 2-methylbutanol, and 2-ethyl hexanol, to improve mechanical properties, stress resistance, and balance migration resistance and volatile loss properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If DEHTP is used as plasticizer, then cost is reduced and plasticization efficiency is improved, but migration properties and stress migration properties deteriorate
Solution Approach 1:
The invention uses a composite plasticizer system comprising multiple citrate esters with different alkyl groups (C3, C4, C5, C6, C7, or C8) in specific weight ratios (5:4:3:2:1:0.5 to 1:2:3:4:5:6 of C3:C4:C5:C6:C7:C8). This composite approach combines the advantages of different chain lengths to achieve both good plasticization efficiency and excellent migration resistance, resolving the contradiction between cost and reliability.
Solution Approach 2:
The invention changes the chemical parameters of the plasticizer by using citrate esters with specifically controlled alkyl group distributions. The weight ratios of different chain length esters are optimized to balance plasticization efficiency (improved by shorter chains) and migration resistance (improved by longer chains), thereby resolving the contradiction through parameter optimization.
2Reliability
If trimellitate-based products are used to improve migration and volatile loss properties, then migration resistance is improved, but plasticization efficiency deteriorates
Solution Approach 1:
The invention employs a composite system of multiple citrate esters where shorter chain esters (C3-C5) provide good plasticization efficiency while longer chain esters (C6-C8) provide migration resistance. The synergistic combination in specific ratios achieves both objectives simultaneously, unlike single-component trimellitates.
Solution Approach 2:
Different citrate ester components perform different functions: shorter chain esters primarily provide plasticization efficiency (local function), while longer chain esters primarily provide migration resistance (local function). The composite system allows each component to excel at its specialized function while contributing to overall performance.
3Strength
If secondary plasticizers are used to improve physical properties, then mechanical properties are improved, but product unit price increases and compatibility problems occur
Solution Approach 1:
The invention segments the plasticizer function into multiple citrate ester components, each with specific alkyl chain lengths that contribute differently to overall performance. This segmentation allows optimization of mechanical properties through the C3-C5 components while maintaining cost-effectiveness through the use of citrate-based chemistry rather than expensive secondary plasticizers.
Data Source
AI summary
The present invention relates to a plasticizer composition, including a lower alkyl-based citrate and a higher alkyl-based citrate at the same time, as citrate, wherein the ratio of a hybrid type to a non-hybrid type and the ratio of the lower alkyl groups to the higher alkyl groups are controlled so that effects are achieved. When applying the plasticizer composition to a resin, stress resistance and mechanical properties can be maintained at an equal or higher level, the migration and volatile loss properties and the plasticization efficiency can be balanced, and the light resistance and heat resistance can be remarkably improved.