Flame-Retardant Epichlorohydrin Rubber with Red Phosphorus
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Solution Overview
Problem
Current flame-retardant rubber compositions, particularly those using bromine-containing and antimony trioxide, pose environmental concerns and require high amounts of halogen-free alternatives, which compromise mechanical strength.
Innovation Solution
A flame-retardant rubber composition incorporating epichlorohydrin-based rubber, red phosphorus, and an inorganic metal compound, such as aluminum hydroxide, which provides effective flame retardancy without significantly reducing mechanical strength, even when used in small amounts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If halogen-free flame retarders are used to replace bromine-containing flame retarders, then environmental harm is reduced, but flame retarder effect is weakened and mechanical strength is lowered
Solution Approach 1:
The invention uses a composite flame retardant system combining red phosphorus (5-20 parts by weight) with an inorganic metal compound (aluminum hydroxide, magnesium hydroxide, calcium hydroxide, molybdenum oxide, or zirconium oxide, each 10-50 parts by weight). This composite approach provides synergistic effects where red phosphorus delivers strong flame retardancy at low concentrations and the inorganic metal compound reinforces mechanical properties, achieving both environmental safety and structural integrity
Solution Approach 2:
The invention optimizes the concentration parameters of flame retardant components, specifically using red phosphorus at 5-20 parts by weight (much lower than conventional halogen-free retarders) combined with inorganic metal compounds at 10-50 parts by weight. This parameter optimization achieves sufficient flame retardancy while minimizing the negative impact on mechanical strength
2Reliability
If halogen-free flame retarders are added in large amounts to achieve sufficient flame retarder effect, then flame retardancy is improved, but mechanical strength is unfavorably lowered
Solution Approach 1:
The patent employs a composite flame retardant system where red phosphorus (5-20 parts by weight) provides efficient flame retardancy through phosphorus-based mechanisms, while the inorganic metal compound (aluminum hydroxide, magnesium hydroxide, calcium hydroxide, molybdenum oxide, or zirconium oxide, each 10-50 parts by weight) contributes to mechanical reinforcement. This composite approach achieves synergistic effects that simultaneously improve flame retardancy and maintain mechanical strength
Solution Approach 2:
The inorganic metal compound acts as an intermediary substance that bridges the gap between flame retardancy and mechanical strength requirements. It works synergistically with red phosphorus, where the metal compound provides structural support and the phosphorus provides flame inhibition, allowing the system to achieve both functions without compromising either
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 achieves excellent flame retardancy while maintaining the mechanical strength of the vulcanizate, making it suitable for various industrial applications.
Implementation Method 1
red phosphorus, which has a high phosphorous content by percentage, is used as a flame retarder and added in a small amount, thereby making it possible to yield a flame retarder rubber composition for vulcanization which exhibits flame retarder effect
Implementation Method 2
a flame-retardant rubber composition for vulcanization, comprising an epichlorohydrin based rubber (A), red phosphorus (B), and a vulcanizing agent (C)
Data Source
AI summary
A flame-retardant rubber composition for vulcanization, comprising an epichlorohydrin based rubber (A), red phosphorus (B), and a vulcanizing agent (C), in which the content of the red phosphorus (B) is from 3 to 20 parts by weight for 100 parts by weight of the epichlorohydrin based rubber (A).