Phenolic Resin Foam Compressive Strength via Hydrofluoroolefin
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Solution Overview
Problem
Phenolic resin foams using chlorinated and non-chlorinated hydrofluoroolefins as replacements for conventional hydrocarbons in insulating materials face issues with reduced compressive strength and closed cell ratio, leading to poor quality foam with high environmental impact and increased costs.
Innovation Solution
A phenolic resin foam with specific density, closed cell ratio, and 10% compressive strength ranges, utilizing 1-chloro-3,3,3-trifluoropropene and additional hydrocarbons, along with nitrogen-containing compounds and additives, to achieve low environmental impact, high compressive strength, and improved handling properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If chlorinated and non-chlorinated hydrofluoroolefins are used as encapsulated compounds in phenolic resin foam, then environmental impact is reduced (low ozone depletion potential and global warming potential), but compressive strength and closed cell ratio are reduced
Solution Approach 1:
The patent changes the physical and chemical parameters of the phenolic resin system by controlling the molecular weight (Mw: 400-3000), viscosity (7000-30000 mPa·s at 40°C), and viscosity increase rate constant (0.05-0.5 1/min) to optimize the interaction between the resin and hydrofluoroolefin compounds. This parameter optimization prevents excessive plasticization while maintaining foam quality and compressive strength.
Solution Approach 2:
The patent creates a composite system combining phenolic resin with specific hydrofluoroolefin compounds (1-chloro-3,3,3-trifluoropropene, 1,3,3,3-tetrafluoro-1-propene, 2,3,3,3-tetrafluoro-1-propene, or 1,1,1,4,4,4-hexafluoro-2-butene) at controlled concentrations (3-20 mass%). This composite approach balances environmental benefits with mechanical properties by carefully selecting the type and amount of fluorinated compounds.
2Strength
If density of phenolic resin foam is increased to improve compressive strength, then handling properties and installation costs worsen
Solution Approach 1:
The patent optimizes the density parameter within a specific range (20-80 kg/m³) to achieve the desired compressive strength without excessive weight gain. By controlling density alongside viscosity and molecular weight parameters, the patent achieves a balanced foam structure that provides sufficient strength while maintaining good handling properties and reasonable installation costs.
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 results in phenolic resin foam with enhanced compressive strength, excellent handling properties, and reduced installation costs, while maintaining low environmental impact and thermal insulation performance.
Implementation Method 1
phenolic resin foam is an excellent insulating material for housing due to having low gas permeability and stable long-term thermal insulation performance
Implementation Method 2
foamed plastic insulating materials obtained through foaming of styrene resin, urethane resin, and phenolic resin
Data Source
AI summary
Provided are a phenolic resin foam having low environmental impact, high compressive strength, excellent handling properties in installation, and low costs associated with securing, and also a method of producing the same. The phenolic resin foam contains at least one selected from the group consisting of a chlorinated hydrofluoroolefin, a non-chlorinated hydrofluoroolefin, and a halogenated hydrocarbon. The phenolic resin foam has a density of at least 20 kg/m3 and no greater than 100 kg/m3, and a closed cell ratio of at least 80% and no greater than 99%. The density and 10% compressive strength of the phenolic resin foam satisfy a relationship: C ≥ 0.5X - 7, where C represents the 10% compressive strength (N/cm2) and X represents the density (kg/m3).