Lubricating Thermoplastic Resin Composition with Chemical Bonding
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Solution Overview
Problem
Rubber-reinforced thermoplastic resin compositions, such as ABS resins, exhibit high friction coefficients due to their amorphous nature, leading to stick-slip phenomena and squeaking sounds in equipment, and conventional lubricant additions result in surface deterioration and temporary lubricating property loss.
Innovation Solution
A lubricating thermoplastic resin composition incorporating an acid-modified copolymer with carboxyl groups and a functionalized lubricant capable of reacting with these groups, which bonds the lubricant to the copolymer, preventing bleeding and maintaining lubricating properties permanently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lubricants such as silicones or polytetrafluoroethylene are added to rubber-reinforced thermoplastic resin compositions, then the friction coefficient is reduced and lubricating properties are improved, but the lubricants bleed out on the surface causing deterioration of surface appearance and loss of lubricating properties over time
Solution Approach 1:
The harmful bleeding out of lubricants is eliminated by extracting the lubricant from the surface and bonding it chemically to the copolymer matrix. The lubricant is taken out of the conventional free-state formulation and integrated into the polymer structure through chemical bonding, preventing surface migration while maintaining lubricating function.
Solution Approach 2:
The invention creates a composite material system where the lubricant is chemically bonded to the acid-modified copolymer of aromatic vinyl and vinyl cyanide. This composite structure combines the resin matrix with the lubricant functional groups, forming an integrated material that provides permanent lubricating properties without surface bleeding.
2Reliability
If conventional lubricants are added to reduce friction coefficient, then lubricating properties are improved initially, but the lubricating properties decrease with time due to gradual loss of bled-out lubricants
Solution Approach 1:
The lubricant is preliminarily bonded to the copolymer chains during the formulation stage, creating pre-formed lubricant-resin complexes. This preliminary chemical bonding ensures that the lubricant remains attached to the polymer matrix throughout the service life, providing durable lubricating properties that do not diminish over time.
Solution Approach 2:
The chemical bonding between the lubricant functional groups and carboxyl groups on the copolymer creates a continuous lubricating action. As the lubricant is uniformly distributed and fixed within the polymer matrix, it continuously provides lubricating properties without interruption or degradation over time, eliminating the temporary nature of conventional lubricant addition.
3Force
If lubricants are added to rubber-reinforced thermoplastic resin compositions to reduce friction, then the friction coefficient is reduced, but the lubricants bleed out and deteriorate the surface appearance of shaped articles
Solution Approach 1:
The lubricant is merged with the copolymer matrix through chemical bonding between the functional groups of the lubricant and the carboxyl groups on the acid-modified copolymer. This merging creates a unified material structure where the lubricant becomes an integral part of the polymer, preventing surface bleeding while maintaining low friction coefficient.
Solution Approach 2:
The carboxyl groups on the acid-modified copolymer act as intermediary bonding sites that chemically link the lubricant molecules to the polymer matrix. This intermediary mechanism provides a strong chemical connection that anchors the lubricant within the material, preventing migration to the surface while maintaining the lubricating function.
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 provides shaped articles with excellent lubricating properties and surface appearance that remain effective over time, preventing surface deterioration and enhancing the durability of the articles.
Implementation Method 1
the lubricant is bonded to the copolymer by the reaction between the carboxyl groups in the copolymer and the functional groups in the lubricant
Data Source
AI summary
[Object] To provide lubricating thermoplastic resin compositions that can give formed articles exhibiting excellent lubricating properties and surface appearance and maintaining the lubricating properties permanently.[Solution] The lubricating thermoplastic resin composition includes an acid-modified copolymer (A) of a monomer mixture including an aromatic vinyl and a vinyl cyanide, the copolymer having a carboxyl group in the molecular chain, and a functionalized lubricant (B) having, in the molecule, a functional group (B1) capable of reacting with the carboxyl group and a lubricating segment (B2) having lubricating properties. The composition may further include a graft copolymer (C) and/or an additional thermoplastic resin (D) other than the acid-modified copolymer (A).