Alkaline Hydro Binding Compatibilizer for Polymer Blends
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Solution Overview
Problem
Existing compatibilizers for polymer blends, particularly those based on PVA, face issues such as high acetic acid content, inadequate binding or cross-linking capabilities, and an unpleasant odor, which affect the miscibility and properties of polar and non-polar polymer blends.
Innovation Solution
An alkaline hydro binding compatibilizer agent (HBCA) comprising a random amphiphilic copolymer of hydrophilic poly(vinyl alcohol) and hydrophobic poly(vinyl acetate) is developed, forming a three-dimensional polymer network with reduced acetic acid content and improved cross-linking properties, using a method that includes hydrolysis and cross-linking of poly(vinyl acetate) with a protective colloid and a cross-linker, followed by pH adjustment and extraction of reaction side products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If PVA-based compatibilizers are used to enhance binding capabilities between polar and non-polar polymers, then adhesion and miscibility are improved, but acetic acid content increases causing unpleasant odor and reduced product quality
Solution Approach 1:
The patent extracts and removes acetic acid from the PVA-based compatibilizer system through extraction processes, thereby eliminating the harmful odor while preserving the adhesion properties of the PVA polymer structure
Solution Approach 2:
The patent modifies the chemical parameters of the PVA system by adjusting pH levels and conducting hydrolysis reactions to transform acetic acid into less harmful substances, thereby reducing odor while maintaining binding capabilities
2Stability of the object's composition
If conventional PVA compatibilizers are used to promote polymer blend miscibility, then adhesion between polar and non-polar phases is improved, but cross-linking capabilities remain inadequate
Solution Approach 1:
The patent creates a composite compatibilizer system combining PVA with cross-linking agents and modifiers to achieve both good miscibility and enhanced cross-linking capabilities that conventional PVA alone cannot provide
Solution Approach 2:
The patent applies chemical modifications including hydrolysis and neutralization reactions to transform PVA into a form with improved cross-linking potential while maintaining its miscibility-promoting properties
3Stability of the object's composition
If block or graft copolymers are used as compatibilizers to stabilize phase morphology, then interfacial tension is reduced and phase separation is minimized, but manufacturing complexity and cost increase
Solution Approach 1:
Instead of using complex block or graft copolymer structures to achieve phase stability, the patent inverts the approach by using simple PVA-based systems with added cross-linking agents to achieve the same stabilization effect with lower structural complexity
Solution Approach 2:
The patent introduces cross-linking agents as intermediary substances that mediate between PVA and the polymer phases, providing phase stabilization without requiring complex copolymer architectures
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 HBCA effectively enhances the miscibility and adhesion of polar and non-polar polymers, reduces acetic acid odor, and improves the mechanical properties of polymer blends by forming a stable three-dimensional network with high oxygen/nitrogen barrier performance.
Implementation Method 1
forming a three-dimensional polymer network based on the copolymer poly(vinyl alcohol-co-vinyl acetate)
Implementation Method 2
comprising hydrophilic poly(vinyl alcohol) (PVOH) and hydrophobic poly(vinyl acetate) (PVA) and forming a poly(vinyl alcohol-co-vinyl acetate) copolymer
Implementation Method 3
The respective portions of the copolymer are able to interact with the two components of the immiscible blend to make the phase morphology more stable. The increased stability is caused by reducing the size of the phase-separated particles in the blend. The size reduction results from the lower interfacial tension
Implementation Method 4
comprising a random amphiphilic copolymer, comprising hydrophilic poly(vinyl alcohol) (PVOH) and hydrophobic poly(vinyl acetate) (PVA)
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention describes an acetic free alkaline hydro binding compatibilizer agent (HBCA) for polymers, based on a poly(vinyl) alcohol (PVOH)-poly-(vinyl)acetic acid (PVA) copolymer, wherein PVOH and PVA are distributed statistically in the PVOH-PVA copolymer, and method for the production thereof. HBAC is an odorless crosslinked copolymer that acts as binding compatibilizer agent for polar polymers and/or non-polar polymers. The invention also includes the process for producing a phyllosilicate hydro binding compatibilizer agent (p-HBCA)) and/or a graphene hydro binding compatibilizer agent (g-HBCA). A suspension of PVA is hydrolyzed and saponified in the batch process in the presence of hydroxides at high temperatures and the resultant copolymer is partially crosslinked under basic aqueous conditions. HBCA is solid at room temperature, with a residual moisture of 30% to 35% and an acetic content less than 3 ppm. The HBAC acts as a hydro binding agent for polymers. HBAC has a positive effect on the phase compatibility between hydrophilic polymers, such as starch, and hydrophobic polymers in the preparation of blends in the extruder, and consequently enhances substantially the properties of extruded products.