Modified Polyolefin Resin Esterification to Prevent Dispersion Thickening
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Solution Overview
Problem
Acid-modified polyolefin resins experience thickening in dispersion liquids when stored for long periods or at high temperatures, especially in the presence of substances containing hydroxy groups, leading to difficulties in blending and application operations.
Innovation Solution
A modified polyolefin resin composition is developed by modifying acid-modified polyolefin resin with an alcohol, where the alcohol reacts with the acid component to form a more stable ester structure, inhibiting crosslinking and maintaining stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acid-modified polyolefin resin is used to improve paint adherability, then adhesion to substrate is improved, but thickening occurs in dispersion liquid during storage
Solution Approach 1:
An alcohol component is introduced as an intermediary substance that reacts with the acid component groups in the acid-modified polyolefin resin to form ester bonds. This intermediary reaction prevents direct crosslinking between acid component groups, thereby maintaining storage stability while preserving the adherability benefits of the acid-modified resin.
Solution Approach 2:
The chemical structure of the resin is modified by controlling the ratio of alcohol to acid component groups. By adjusting this parameter (molar ratio), the degree of esterification is controlled to optimize both storage stability and adherability, transforming the resin from a state prone to crosslinking to a stable esterified state.
2Reliability
If acid component groups are present in the resin, then paint affinity is improved, but crosslinked structure forms causing thickening
Solution Approach 1:
The harmful crosslinking reaction between acid component groups is converted into a beneficial esterification reaction with alcohol. The acid component groups that would otherwise cause thickening are instead used to form stable ester bonds with alcohol, converting a harmful effect into a beneficial stabilization mechanism while preserving paint affinity.
3Reliability
If dispersion liquid is stored for long period, then paint-applicability is secured, but thickening increases making blending difficult
Solution Approach 1:
The esterification reaction with alcohol is performed preliminarily during resin preparation or early in the dispersion process. This preliminary action prevents subsequent crosslinking and thickening during storage, ensuring that the dispersion liquid remains blendable and operable throughout its shelf life while maintaining paint-applicability.
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 polyolefin resin composition exhibits excellent storage stability, adherability, and pigment dispersibility, even after prolonged storage, with reduced thickening and improved interaction with substrates.
Implementation Method 1
modifying an acid-modified polyolefin resin (A) with a modification component comprising an alcohol (B), wherein the acid-modified polyolefin resin (A) is a resin formed by modifying a polyolefin (a) with an α, β-unsaturated carboxylic acid and a derivative (b) of the α, β-unsaturated carboxylic acid having a structure (b1) derived from at least one carboxy group
Data Source
AI summary
A modified polyolefin resin composition may include a modified polyolefin resin (X) formed by modifying an acid-modified polyolefin resin (A) with a modification component comprising an alcohol (B), in which the modified polyolefin resin composition satisfies (I) to (III): (I) the resin (A) is a resin formed by modifying a polyolefin (a) with an α,β-unsaturated carboxylic acid and a derivative (b) of the α,β-unsaturated carboxylic acid having a structure (b1) derived from at least one carboxy group; (II) a residual ratio of the structure (b1) in the resin (X) is more than 0% to 50% or less; and (III) a content of the alcohol in the composition is 1.0 mol to 5.0 mol relative to 1.0 mol of the structure (b1) that the resin (A) has.