PVC Compositions Using DBTP and DIBTP Plasticizers
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Solution Overview
Problem
High-solvating plasticizers used in PVC compositions, such as butyl benzyl phthalate, tend to have instability in viscosity, leading to issues like poor mold filling, premature gelling, and reduced production efficiency, while also lacking stain resistance compared to benzoate esters.
Innovation Solution
Incorporating di-butyl terephthalate (DBTP) and di-isobutyl terephthalate (DIBTP) as high-solvating plasticizers in PVC compositions, which provide better low-temperature properties, stain resistance, and viscosity stability, allowing for improved processing and performance in various applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional high-solvating plasticizers (such as butyl benzyl phthalate) are used in PVC compositions, then fusion speed is improved, but viscosity stability deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the plasticizer by selecting specific esters with particular molecular structures (benzoate esters, terephthalate esters, phthalate esters with specific alkyl groups) to achieve both fast fusion and viscosity stability. The plasticizers are selected based on their solvating power, molecular weight, and chemical structure to optimize both fusion speed and viscosity stability simultaneously.
2Speed
If traditional high-solvating plasticizers are used in PVC compositions, then fusion speed is improved, but stain resistance deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by selecting plasticizers with specific molecular structures that provide inherent stain resistance. Benzoate esters and terephthalate esters are specifically chosen because their chemical structures resist staining while maintaining high solvating power for fast fusion.
3Speed
If plasticizers with high affinity for PVC resin are used to achieve quick fusion, then fusion speed is improved, but low-temperature properties deteriorate
Solution Approach 1:
The patent changes the plasticizer parameters by selecting esters with specific chain lengths and molecular structures that balance solvating power with low-temperature flexibility. The selected plasticizers maintain fast fusion through high affinity for PVC while their molecular structures prevent excessive rigidity at low temperatures.
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
DBTP and DIBTP-containing PVC compositions exhibit enhanced low-temperature flexibility, stain resistance, and viscosity stability, enabling efficient processing and maintaining these advantages over time, thus addressing the limitations of traditional high-solvating plasticizers.
Implementation Method 1
In the typical fusion process, the PVC resin particles dissolve and/or break apart, intermingle with all the other additives to produce the final homogenously mixed material. Plasticizers that have a high affinity for PVC resin resulting in very quick fusion are called high-solvating plasticizers.
Implementation Method 2
DBTP-containing plastisols also are lower in viscosity and maintain this difference as the plastisol ages.
Data Source
AI summary
A polyvinyl chloride composition having polyvinyl chloride resin and a plasticizer ester selected from di-butyl terephthalate, di-isobutyl terephthalate, or mixtures thereof.