PBI/PVB Polymer Blend Coatings for Moisture Resistance

Solution Overview

Problem

There is a need for improved coatings that leverage the unique chemical, physical, and electrical properties of polybenzimidazole (PBI) with enhanced moisture resistance and adhesion to substrates, particularly in applications where PBI-based coatings fall short.

Innovation Solution

A polymer mixture comprising polybenzimidazole (PBI) and polyvinylbutyral (PVB) is developed, with varying weight ratios, which improves moisture resistance and adhesion to substrates, allowing for better performance in water immersion and electrical properties when used in coatings.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If PBI-based coatings are used, then electrical insulation properties are improved, but moisture resistance and adhesion to substrate deteriorate

Engineering Contradiction:

Improveelectrical insulation propertiesVSAvoidmoisture resistance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies composite materials by combining PBI and PVB polymers in a blend ratio of 95:5 to 50:50 by weight. This composite approach allows the coating to inherit the excellent electrical insulation properties of PBI while gaining the moisture resistance and adhesion benefits of PVB, thereby resolving the contradiction between electrical performance and environmental stability

Inventive Principle:

Principle #40Composite materials

2Reliability

If PBI-based coatings are used, then electrical insulation properties are improved, but adhesion to substrate deteriorates

Engineering Contradiction:

Improveelectrical insulation propertiesVSAvoidadhesion to substrate

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent applies composite materials by combining PBI and PVB polymers in a blend ratio of 95:5 to 50:50 by weight. This composite approach allows the coating to inherit the excellent electrical insulation properties of PBI while gaining the moisture resistance and adhesion benefits of PVB, thereby resolving the contradiction between electrical performance and environmental stability

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS9732224B2Polybenzimidazole/polyvinylbutyral mixtures

Publication Date: 2017.08.15 PBI PERFORMANCE PRODUCTS INC

AI summary

The polymer mixture comprises polybenzimidazole (PBI)/polyvinylbutyral (PVB). The weight ratio (PVB:PBI) of this mixture may range from 0.25-50:50-99.75 or 15-85:15-85. The coating is based upon the polymer mixture.