Curing temperature and curing of the heat resistance of the curing agent
Various Curing Agent Curing Temperature Varies, The Heat Resistance Of The Cured Product Is Also Very Different. In General, The Use Of High Curing Temperature Curing Agent Can Be Cured Product Excellent In Heat Resistance. For Addition Polymerization Type Curing Agent, Curing Temperature And Heat Resistance Improve In The Following Order:
Aliphatic Polyamines <Alicyclic Polyamine <Phenolic Aromatic Polyamine ≈ <Anhydride
Heat Resistance Generally Catalyzed Polyaddition Type Curing Agent In An Aromatic Polyamine Levels. Anionic Polymeric (Tertiary Amines And Imidazole Antiquity), Cation Polymerization Type (BF3 Complex) Is Substantially The Same As The Heat Resistance, Although It Is Mainly Different Initial Reaction Mechanism, But Eventually Form An Ether Bond Mesh Structure.
A Chemical Reaction Curing Reaction, The Curing Temperature Greatly Affected By Temperature Increases, The Reaction Speed, Gel Time Is Shorter; Logarithmic Value With A Generally Linear Increase In Curing Temperature Gelation Time Decreased. But Curing Temperature Is Too High, Often Make The Cured Performance Degradation, So The Upper Limit Of The Curing Temperature Of Existence; Must Be Selected So That The Curing Speed And Curing Temperature Performance Tradeoffs, As Suitable Curing Temperatures. Press The Curing Temperature Curing Agent Into Four Categories: Low Temperature Curing Agent At A Temperature Below Room Temperature; Room Temperature Curing Agent Curing At Room Temperature ~ 50 ℃; Temperature Curing Agent Is 50 ~ 100 ℃; High Temperature Curing Agent At A Temperature Above 100 ℃ . Low Temperature Curing Agent Species Belong Rarely Curable, Poly-Sulfur Alcohol Type, Type, Etc. Polyisocyanate; In Recent Years The Development Of Domestic Production Of The T-31 Modified Amine, YH-82 Can Be Modified Amine Curing Below 0 ℃. Belong To Many Different Types Of Room Temperature Curing Type: Aliphatic Polyamines, Alicyclic Polyamines; Low Molecular Weight Polyamide And Modified Aromatic Amines. Temperature Curing Type Belonging Part Alicyclic Polyamines, Tertiary Amines, Squint Azoles And Boron Trifluoride Complexes. Belongs To The High Temperature-Type Curing Agent Are Aromatic Polyamines, Acid Anhydrides, Resol Resins, Amino Resins, Dicyandiamide And Hydrazide And The Like.
For High Temperature Curing Systems, The Curing Temperature Is Generally Divided Into Two Stages, Prior To The Gel Using A Low Temperature Cure, Gel, Or After Reaching A State Higher Than The Gel State, And Then The High Temperature Heating After Curing (Post-Cure), Relative Curing The Pre-Cured Before Paragraph (Pre-Cure).
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