Amino Silane Modified PPS Resin for Drinking Water Safety
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Solution Overview
Problem
Conventional polyphenylene sulfide (PPS) resin compositions used in water plumbing applications lack sufficient water pressure cracking strength and are hazardous due to the use of alkoxysilane compounds containing epoxy groups, which are not registered under ACS regulations for use with drinking water.
Innovation Solution
A PPS resin composition comprising 100 parts of acid-treated polyphenylene sulfide resin, 10 to 100 parts of glass fiber, and 0.1 to 10 parts of an amino group-containing alkoxysilane compound, with specific processing conditions to achieve an exothermic peak temperature of 195°C to 225°C and controlled melt kneading energy, along with the use of a surface treating agent for the glass fiber, such as an epoxy compound, to enhance mechanical strength and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If epoxy group-containing alkoxysilane compounds are added to PPS resin to enhance molded article strength, then mechanical strength is improved, but the material becomes hazardous for drinking water applications due to cancer suspicion and lack of ACS registration
Solution Approach 1:
The patent changes the chemical parameter of the alkoxysilane compound from epoxy group-containing to amino group-containing, specifically using γ-aminopropyltriethoxysilane. This parameter change maintains the strength-enhancing effect while eliminating the health hazards and ACS registration issues associated with epoxy compounds
Solution Approach 2:
The patent replaces the hazardous epoxy group-containing alkoxysilane with a safer alternative that is ACS-registered and approved for drinking water contact, effectively substituting a harmful material with a safe one while maintaining functional performance
2Ease of manufacture
If conventional PPS resin composition is used for water plumbing, then processability and shaping freedom are improved compared to metal, but water pressure cracking strength is insufficient for high hydraulic pressure applications
Solution Approach 1:
The patent creates a composite material system by combining PPS resin with amino group-containing alkoxysilane compound and glass fiber. This composite structure achieves both the processability advantages of resin and the high strength required for water pressure cracking resistance, overcoming the limitations of conventional PPS compositions
Solution Approach 2:
The amino group-containing alkoxysilane compound acts as a coupling agent or intermediary between the PPS resin and glass fiber, enhancing the interfacial bonding and thereby improving the overall water pressure cracking strength of the composite material while maintaining good processability
3Object-affected harmful factors
If amino group-containing alkoxysilane compound is added to PPS resin to improve safety, then health safety is improved, but the reaction between PPS and alkoxysilane is insufficient in melt kneading
Solution Approach 1:
The patent applies preliminary action by subjecting the PPS resin to acid treatment before combining with the amino group-containing alkoxysilane compound. This pre-treatment modifies the PPS surface to enhance its reactivity, ensuring sufficient reaction occurs during subsequent melt kneading while maintaining the health safety benefits of the amino-based compound
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 composition exhibits enhanced water pressure cracking strength, meeting the requirements for high hydraulic pressure applications and compliance with ACS regulations, ensuring safety for use with drinking water.
Implementation Method 1
the reaction between PPS and alkoxysilane is insufficient in melt kneading
Implementation Method 2
an amino group-containing alkoxysilane compound... to enhance the toughness and mechanical characteristics
Implementation Method 3
10 to 100 parts by weight of a glass fiber
Implementation Method 4
excellent mechanical strength, stiffness
Implementation Method 5
a surface treating agent for (B) said glass fiber comprises an isocyanate-based compound, an organic silane-based compound, an organic titanate-based compound, an organic borane-based compound, or an epoxy compound
Implementation Method 6
an exothermic peak temperature (Tmc) of 195°C to 225°C, the exothermic peak temperature being observed during a crystallization caused when the polyphenylene sulfide resin composition is melted by heating to 340°C and then cooled
Data Source
AI summary
A poly(phenylene sulfide) resin composition characterized by comprising (A) 100 parts by weight of an acid-treated polyphenylene sulfide resin, (B) 10 to 100 parts by weight of a glass fiber, and (C) 0.1 to 10 parts by weight of an amino group-containing alkoxysilane compound, wherein said polyphenylene sulfide resin composition has an exothermic peak temperature (Tmc) of 195°C to 225°C, said exothermic peak temperature being observed during a crystallization caused when said polyphenylene sulfide resin composition is melted by heating to 340°C and then cooled at a rate of 20°C/minute, using a differential scanning calorimeter. The poly (phenylene sulfide) resin composition has excellent water pressure cracking strength.