Polyamide-Coated Dish Rack for Plastic Deformation Resistance
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Solution Overview
Problem
Dishwasher dish support racks coated with polyamide 11 and 12 are prone to deformation and failure due to low plastic deformation threshold, despite offering good oil resistance and water absorption properties, necessitating a composition with improved mechanical properties and resistance to harsh dishwashing environments.
Innovation Solution
A dish support rack with a metal wire frame coated using a polyamide composition comprising more than 50% wt of polyamide (A) with recurring units of —HN—(CH2)6—NH—C(O)—(CH2)8—C(O)—, providing a relative viscosity of at least 2, and optionally up to 10% wt of fillers and additives, enhancing mechanical properties and stability at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyamide 11 or 12 coating is used on dish support racks, then oil resistance and water absorption properties are improved, but mechanical strength and resistance to plastic deformation deteriorate
Solution Approach 1:
The patent applies composite materials by combining polyamide 6,10 with specific additives and fillers to create a coating composition that integrates the desirable properties of different materials. The composite formulation includes polyamide 6,10 as the base resin, combined with coupling agents, lubricants, and fillers to achieve both chemical resistance and mechanical strength simultaneously.
Solution Approach 2:
The patent changes the chemical composition parameters of the polyamide coating by specifying polyamide 6,10 with particular molecular weight ranges (intrinsic viscosity 0.6-1.2 dL/g) and incorporating specific additives at controlled concentrations. This parameter optimization resolves the contradiction by tuning the coating's chemical structure to balance chemical resistance and mechanical properties.
2Ease of manufacture
If polyamide 6,10 with low intrinsic viscosity is used, then coating applicability and surface finish are improved, but mechanical strength and stress at yield deteriorate
Solution Approach 1:
The patent optimizes the intrinsic viscosity parameter of polyamide 6,10 to a specific range (0.6-1.2 dL/g) that balances coating flow properties for easy application with sufficient mechanical strength. This parameter window ensures the coating can be properly applied while maintaining adequate stress at yield and mechanical performance.
Solution Approach 2:
The patent uses composite materials by combining polyamide 6,10 with reinforcing fillers and coupling agents that enhance mechanical strength without compromising coating applicability. The synergistic combination of resin and additives achieves both ease of manufacture and mechanical strength.
3Strength
If high stress at yield is achieved through composition modification, then resistance to plastic deformation is improved, but coating flexibility and adaptability to wire frame may deteriorate
Solution Approach 1:
The patent employs composite materials that combine rigid reinforcing components with flexible polymer matrices. The polyamide 6,10 resin provides flexibility and adhesion to the wire frame, while incorporated fillers and additives enhance stress at yield and resistance to plastic deformation, achieving both properties simultaneously.
Solution Approach 2:
The patent applies local quality by creating a coating structure where different components perform different functions: the polyamide resin matrix provides flexibility and adhesion, while dispersed fillers and crystalline regions provide strength and resistance to deformation. This heterogeneous structure achieves both flexibility and high stress at yield.
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 solution provides improved mechanical properties and resistance to plastic deformations, ensuring better performance in harsh dishwashing conditions with increased stress at yield, thus enhancing the durability of the dish support racks.
Implementation Method 1
a coating covering the frame and configured to distribute water over a surface of the coating in a thin film
Implementation Method 2
delivering outstanding resistance to chemically harsh environments, and possessing improved mechanical properties... providing for increased stress at yield, thus indicating better resistance against plastic deformations
Data Source
AI summary
The invention pertains to a dish support rack having outstanding resistance to chemically harsh environments, and possessing improved mechanical properties, said dish support rack comprising a metal wire frame coated with a polyamide composition [composition (C)] comprising: —more than 50% wt of a polyamide [polyamide (A), herein after], more than 50% moles of recurring units of said polyamide complying with formula: —HN—(CH2)6—NH—C(O)—(CH2)8—C(O)— [recurring units (R6,10)], and, optionally: —up to 10% wt of conventional filler(s) and/or additive(s), and to a method for its manufacture.