Polycarbonate Fat-Resistant Mold Composition
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Solution Overview
Problem
Polycarbonate materials used in food contact applications, such as chocolate pouring molds, exhibit inadequate tension-resistant resistance when in contact with fats and oils, leading to damage and limited product lifetime. Additionally, polycarbonate surfaces tend to have a shiny appearance and poor melting capacity, which restricts the formation of intricate chocolate mold designs.
Innovation Solution
A thermoplastic composition is developed, comprising aromatic polycarbonate, rubber-modified vinyl (CO) polymerisates, and optional polymer additives. This composition balances improved melting capacity and tension resistance compared to pure polycarbonate, while maintaining similar properties like toughness, rigidity, heat resistance, and hydrolysis resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pure polycarbonate is used for molded articles in contact with fats and oils, then good toughness, rigidity, and heat resistance are achieved, but stress cracking resistance is insufficient leading to damage and limited product lifetime
Solution Approach 1:
The patent applies composite materials by combining polycarbonate with相容ible thermoplastic polymers (such as polypropylene, polyethylene, polyester) to create a blended composition. This composite approach allows the material to maintain the toughness and rigidity of polycarbonate while gaining improved stress cracking resistance from the thermoplastic components, thereby extending product lifetime in fat and oil contact applications.
Solution Approach 2:
The patent employs parameter changes by modifying the molecular weight, melt flow rate, and composition ratios of the polycarbonate-thermoplastic blend. By adjusting these parameters, the material achieves optimal balance between stress cracking resistance and mechanical properties, resolving the contradiction between immediate performance and long-term durability.
2Ease of manufacture
If polycarbonate is used for chocolate molds, then good heat resistance is achieved, but surface finish is shiny and melting capacity is poor, restricting intricate design formation
Solution Approach 1:
The patent uses composite materials by blending polycarbonate with thermoplastic polymers that have different surface properties and melting characteristics. This composite composition enables the mold to achieve both good heat resistance from polycarbonate and improved surface finish with matte appearance from the thermoplastic components, while enhancing melting capacity for intricate chocolate design formation.
3Strength
If polycarbonate is used for food contact applications, then good fracture resistance and lower weight are achieved, but stress cracking in contact with fats and oils leads to damage
Solution Approach 1:
The patent applies composite materials by creating a blend of polycarbonate with fat-resistant thermoplastic polymers. This composite structure maintains the fracture resistance and lightweight advantages of polycarbonate while the thermoplastic components provide resistance to stress cracking from fat and oil contact, eliminating the harmful effect.
Solution Approach 2:
The patent converts the harmful effect of fat and oil contact into a benefit by selecting thermoplastic polymers that are inherently resistant to fat and oil degradation. These polymers, when blended with polycarbonate, transform the previously harmful fat contact environment into a condition that actually protects the material from stress cracking.
Data Source
AI summary
The invention relates to an item selected from the group consisting of containers for packaging, serving, storing and/or transporting fats, oils and fatty foods, tools for the consumption of fats, oils and fatty foods, tools for producing, preparing, shaping and processing fats, oils and fatty foods, as well as parts of machines for producing, preparing, shaping and processing fats, oils and fatty foods, including a moulded body consisting of a particular thermoplastic polycarbonate composition, wherein the moulded body is in direct contact with the fats, oils and fatty foods during the use of the item. The invention also relates to the use of the specific thermoplastic polycarbonate composition for producing the moulded body as a part of the item, the use of the item for transporting, packaging, storing, handling, producing, preparing, processing and shaping fats, oils and fatty foods, and a method for producing a shaped fat or fatty food.