Bismuth Vanadate Pigment Stabilization in Thermoplastics
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Solution Overview
Problem
Bismuth vanadate pigments in thermoplastic molding compositions, particularly polyamide compositions, suffer from thermal degradation issues when boric acid is not used for stabilization, and alternative stabilization methods are needed to maintain color stability during processing and storage.
Innovation Solution
A bismuth vanadate pigment composition is stabilized by dispersing it in a copolymer of ethylene with (meth)acrylic acid, C1-12 alkyl (meth)acrylates, or maleic anhydride, which provides thermal stability and improved color retention in thermoplastic polymers during processing and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If boric acid is used to stabilize bismuth vanadate pigment in thermoplastic molding compositions, then thermal stability is improved, but the use of boric acid is discouraged due to environmental and health concerns
Solution Approach 1:
The invention extracts and removes boric acid from the stabilization system while maintaining thermal stability through alternative means. The patent specifically addresses the problem of replacing boric acid with a bismuth vanadate masterbatch that achieves stability without this harmful substance.
Solution Approach 2:
The patent introduces an intermediary stabilization mechanism using a coating comprising an anti-oxidant on the bismuth oxy halide pigment, which mediates between the pigment and thermal degradation conditions, preventing direct thermal damage without requiring boric acid.
2Object-affected harmful factors
If bismuth vanadate pigment is used without boric acid stabilization, then environmental safety is improved, but thermal degradation occurs rapidly
Solution Approach 1:
An anti-oxidant coating is applied to the bismuth oxy halide pigment to serve as an intermediary protective layer that prevents thermal degradation without requiring boric acid. This coating mediates the interaction between the pigment and harsh thermal processing conditions.
Solution Approach 2:
The patent changes the stabilization mechanism from chemical (boric acid) to physical/chemical coating (anti-oxidant layer), altering how the pigment is protected during thermal processing while eliminating the harmful substance.
3Ease of manufacture
If bismuth vanadate pigment is dispersed in polyethylene masterbatch, then processing is simplified, but thermal degradation is not prevented
Solution Approach 1:
The anti-oxidant coating acts as an intermediary protective barrier on the pigment particles within the polyethylene masterbatch, enabling simplified processing while preventing thermal degradation that would otherwise occur in standard polyethylene systems.
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 bismuth vanadate pigment composition maintains stability and color integrity in thermoplastic polymers, preventing thermal degradation and ensuring consistent performance in injection molding and other processing methods.
Implementation Method 1
bismuth vanadate pigment dispersed in a copolymer of ethylene with at least one comonomer, selected from the group consisting of (meth)acrylic acid, C 1-12 -alkyl (meth)acrylates and maleic anhydride
Implementation Method 2
the resulting pigment composition is stable against thermal degradation upon storage, upon inclusion in thermoplastic polymers and upon processing of the thermoplastic polymer
Data Source
AI summary
Pigment composition, comprising bismuth vanadate pigment dispersed in a copolymer of ethylene with at least one comonomer, selected from the group consisting of (meth)acrylic acid, C1-12-alkyl (meth)acrylates and maleic anhydride.