PPS Yarn Pipe Thread Sealant for High-Temperature Joints
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Solution Overview
Problem
Existing sealant materials for pipe joints, such as LOCTITE 55 and other polymer-coated wire or resin-based solutions, do not adequately perform in high-temperature applications and may be toxic, limiting their use in certain environments like paint and body repair shops, and can cause environmental stress cracking on specific pipe fittings.
Innovation Solution
A sealant material comprising a multifilament or spun polyphenylene sulfide yarn coated with a non-curable silicone oil, specifically polydimethylsiloxane terminated with methyl or phenyl groups, which provides high temperature resistance and is non-toxic, allowing for effective sealing of joints that can withstand temperatures up to 280°C without leaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional sealant materials (polymer-coated wire or resin-based solutions) are used, then sealing function is provided, but high-temperature resistance is insufficient and toxicity occurs
Solution Approach 1:
The invention changes the chemical composition parameters of the sealant material by using polyphenylene sulfide yarn instead of conventional polymer-coated wire or resin-based solutions. This material substitution provides both high-temperature resistance (withstand up to 280°C) and maintains non-toxic properties, resolving the contradiction between temperature resistance and sealing reliability.
Solution Approach 2:
The invention uses a composite structure consisting of polyphenylene sulfide yarn as the base material coated with joint sealing composition. This composite material combines the high-temperature stability of polyphenylene sulfide with the sealing properties of the coating, achieving both temperature resistance and reliable sealing performance simultaneously.
2Temperature
If silicone oil-based sealant is used, then high-temperature resistance is improved, but environmental stress cracking occurs on specific pipe fittings
Solution Approach 1:
The invention replaces conventional silicone oil-based sealants with a polyphenylene sulfide yarn-based sealant that does not cause environmental stress cracking. The polyphenylene sulfide material provides comparable high-temperature resistance (280°C) without the harmful side effect of stress cracking on polypropylene and similar pipe fittings.
3Object-affected harmful factors
If natural oil with high smoke point is used, then non-toxic property is achieved, but temperature resistance is insufficient
Solution Approach 1:
The invention creates a composite sealant material where polyphenylene sulfide yarn serves as the base structure providing high-temperature stability, while the joint sealing composition coating provides the non-toxic sealing function. This composite structure achieves both non-toxic properties and high temperature resistance (280°C), overcoming the limitations of natural oils alone.
Data Source
Figure 1~2
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.