PPS Yarn Sealant Composition for High-Temperature Pipe Joints
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Solution Overview
Problem
Existing sealant materials for pipe joints, such as LOCTITE 55 and other polymer-based coatings, do not adequately perform in high-temperature applications and may not be suitable for environments where toxicity and environmental stress cracking are concerns.
Innovation Solution
A sealant material comprising a multifilament or spun polyphenylene sulfide yarn coated with a non-curable joint sealing composition of silicone oil or natural oils with a smoke point of 230° C or higher, specifically polydimethylsiloxane and oils like avocado oil, which provides high temperature resistance and non-toxicity, and includes optional inert fillers like calcium carbonate and PTFE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional polymer-based sealant materials (e.g., LOCTITE 55) are used for pipe joints, then the joints can be sealed effectively at normal temperatures, but the sealant performance deteriorates at high temperatures
Solution Approach 1:
The invention changes the chemical composition parameters of the sealant material by using polyphenylene sulfide yarn instead of traditional polymer-based materials, and coating it with silicone oil or natural oil compositions. This parameter change enables the sealant to maintain its sealing properties at high temperatures up to 280°C, resolving the contradiction between temperature resistance and sealant performance reliability.
Solution Approach 2:
The invention creates a composite sealant material by combining polyphenylene sulfide yarn with silicone oil or natural oil coating. This composite structure leverages the high-temperature stability of polyphenylene sulfide and the sealing properties of the oil coating, achieving both temperature resistance and reliable sealing performance that neither material could provide alone.
2Object-affected harmful factors
If conventional sealant materials are used, then the application process is simple, but the materials may cause environmental stress cracking and toxicity concerns
Solution Approach 1:
The invention uses non-curable silicone oil or natural oil coatings that remain flexible and do not brittle over time. These materials can be easily applied and removed if needed, and do not create long-term environmental stress cracking issues associated with traditional curable polymers, thus reducing harmful factors while maintaining ease of application.
Solution Approach 2:
The polyphenylene sulfide yarn and silicone oil/natural oil coating create an inert sealing environment that is chemically resistant and does not promote environmental stress cracking. This inert composition eliminates toxicity concerns while the coating application process remains simple and straightforward.
3Temperature
If the sealant material uses natural oils with high smoke points, then the material provides high temperature resistance without smoking, but the formulation becomes more specific and complex
Solution Approach 1:
The invention specifies natural oils with smoke points of 230°C or higher (such as avocado oil, safflower oil, rice bran oil, soya bean oil, and sesame oil) to achieve high-temperature resistance without smoking. This parameter specification for the oil smoke point directly enables the sealant to withstand temperatures up to 280°C without emitting smoke, resolving the contradiction between temperature resistance and formulation complexity.
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 sealant material effectively seals joints at high temperatures up to 280° C without smoking or leaking, allows for re-adjustment of joints, and prevents environmental stress cracking, offering improved performance and safety compared to traditional materials.
Implementation Method 1
a joint sealing composition comprising a silicone oil or a natural oil with a smoke point of about 230° C. or higher
Implementation Method 2
the joints sealed with the sealant material of the invention can withstand temperatures of up to 280° C. and higher, for example 280° C. and higher and remain intact without leaking
Implementation Method 3
allows for re-adjustment of joints
Implementation Method 4
prevents environmental stress cracking
Data Source
AI summary
A sealant material for sealing threaded pipe joints that is a multifilament or spun polyphenylene sulfide yarn and a joint sealing composition comprising a silicone oil or a natural oil with a smoke point of about 230° C. or higher. The polyphenylene sulfide yarn is coated with the joint sealant composition. The material forms an effective seal and is resistant even when used in systems in which it is exposed to temperatures in excess of 280° C. The material may be provided in a dispenser.