Polyvinyl Alcohol Coating for UV Protection of Elastomers
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Solution Overview
Problem
Elastomers with insulating properties, such as NBR and NBR/PVC blends, degrade significantly when exposed to UV rays, leading to high maintenance costs due to the need for frequent replacement.
Innovation Solution
Coating NBR or NBR/PVC elastomers with a film of polyvinyl alcohol, optionally combined with titanium dioxide nanoparticles, to create a protective layer that prevents UV-induced degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If elastomers (NBR or NBR/PVC blends) are used for insulating applications, then insulating properties and elastic properties are improved, but resistance to UV degradation deteriorates
Solution Approach 1:
A polyvinyl alcohol film is introduced as an intermediary protective layer between the UV environment and the elastomer. This coating layer absorbs or blocks UV radiation, preventing direct degradation of the elastomer while allowing the elastomer to maintain its insulating and elastic functions.
Solution Approach 2:
The solution combines polyvinyl alcohol coating with elastomer substrate to create a composite structure. The polyvinyl alcohol layer provides UV protection while the elastomer provides insulating and elastic properties, achieving both protection and functional performance.
2Duration of action of moving object
If elastomers are exposed to UV rays for prolonged periods, then initial functionality is maintained, but degradation occurs leading to frequent replacement
Solution Approach 1:
The polyvinyl alcohol coating is applied in advance to the elastomer surface before UV exposure begins. This preliminary protective action prevents UV degradation from occurring, extending the service life of the elastomer from months to over 19 months of UV exposure.
3Reliability
If elastomers degrade due to UV exposure, then maintenance costs increase due to frequent replacement
Solution Approach 1:
The polyvinyl alcohol film serves as a sacrificial intermediary that protects the valuable elastomer from UV degradation. By applying this inexpensive coating, the expensive elastomer components last significantly longer, reducing maintenance and replacement costs.
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 polyvinyl alcohol coating significantly extends the elastomers' resistance to UV aging, maintaining their integrity and functionality for over 19 months without significant alteration or degradation.
Implementation Method 1
by coating the elastomers based on NBR or on NBR/PVC blends with a film of polyvinyl alcohol, the elastomers are protected from degradation due to UV rays
Implementation Method 2
depositing said solution on said elastomer; drying said solution deposited on said elastomer in such a way as to obtain a film of polyvinyl alcohol
Data Source
Figure 1a~1d
Figure 2
Figure 3~4
AI summary
The present invention refers to elastomers with a coating of polyvinyl alcohol and to processes for their preparation. The present invention further refers to the use of polyvinyl alcohol films for the protection of elastomers from degradation caused by exposure to UV rays.