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What Is The Curing Agent?


The Curing Agent Is A Kind Of Enhancement Or Control The Curing Reaction Of The Substance Or Mixture. The Resin Is Cured Through Condensation, Closed-Loop, Addition Or Catalytic Chemical Reaction, The Thermosetting Resin Changes Irreversible Process, Curing Is Effected By Adding A Curing (Crosslinking) Agent To Complete. The Curing Agent Is Essential Additives, Whether For Adhesives, Coatings, Casting Material Are Required To Add A Curing Agent, Can Not Be Cured Otherwise The Epoxy Resin. Variety Curing Agent On The Mechanical Properties Of The Cured, Heat Resistance, Water Resistance, Corrosion Resistance Has A Significant Impact.

Hardener Classification: 1 Basic Class 2. Class 3. Acid Catalyzed Addition Cure 4. 5. 6. Apparent Type Latent Amine Curing Agent 7. 8. 9. The Acid Anhydride Type Curing Agent Synthetic Resin Curing Agent.

Wherein The Amine Curing Agents Are Common: The Role Of Primary Amine And Secondary Amine Cured Epoxy Resin Epoxy Group Is To Open By The Active Hydrogen On The Nitrogen Atom, Leaving The Crosslinking Cured. Aliphatic Polyamines Such As Diethyl Toluene Diamine (DETDA), Dimethylthiotoluenediamine (DMTDA), Ethylene Diamine, Hexamethylene Diamine, Diethylene Triamine, Triethylenetetramine, Diethylaminopropylamine Other Active Large, Can Make The Room Temperature Curing Epoxy Crosslinking; And Low Aromatic Polyamine Activity, Such As M-Phenylenediamine, Was At 150 ℃ Can Be Completely Cured. I Produced A Chain Extender DETDA Novel Curing Agent, DMTDA Replace The United States Albemarle DETDA Ethacure 100 And Lonza'S Lonzacure DETDA 80, Currently The Two Export-Oriented Products, Major Export Markets: Japan, South Korea, India, Pakistan, Russia And Other Countries.

Here Are Some Polyurethane Curing Agent Diethyltoluenediamine (DETDA):Diethyl Toluene Diamine (DETDA) Is A Polyurethane Elastomer And The Aromatic Diamine Curing Agent Is An Epoxy Resin, For Casting, Coating, RIM And Adhesive Is Polyurethane And Polyurea Elastomer Chain Extender.DETDA Is A Bit Hindered Aromatic Diamine, Steric Hindrance And Methyl Ethyl Makes Its Activity Is Much Lower Than Toluene Diamine (TDA). The Reaction Rate It Polyurethane Prepolymer Several Times Faster Than DMTDA, About 30 Times Faster Than MOCA. Mainly Used In RIM Polyurethane Systems And Spray Polyurethane (Urea) Elastomer Coating Systems, With Fast Response, Release Time Is Short, High Initial Strength, Hydrolysis Products, Heat And So On. The Products Are Also Used As Additional Elastomers, As A Reaction Injection Molded Polyurethane Chain Extender, Polyurethane Coatings, Epoxy Resin, Alkyd Resin Curing Agent. Lubricants And Pesticides, Dyes Intermediates, Plastics, Rubber, Oils, Antioxidants, And Chemical Synthesis Intermediates.

Performance Testing

Products Cured In An Oven At 120 ℃ In 12h, At Room Temperature For 7 Days, According To The West German Standard DNI53504 Test Product Performance And Imports Considerably:

Project Production DETDA Import DETDA,
Tensile Strength (MPa) 18.52 16.9
Elongation At Break (%) 300 280
Flexural Modulus (MPa) 208,5 210.8
Flexural Strength (MPa) 10.63 10.98

The Curing Temperature Of The Curing Agent And Heat Resistance

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 <Aromatic Polyamine <Phenolic <Anhydride

Heat Resistance Generally Catalyzed Polyaddition Type Curing Agent Is An Aromatic Polyamine Levels. Anionic Polymeric (Tertiary Amines And Imidazole Antiquity), Cation Polymerization Type (BF3 Complex) Is Substantially The Same Heat Resistance, Although It Is Mainly Different Reaction Mechanism Starting, But Eventually Form An Ether Bond Mesh Structure.

A Chemical Reaction Curing Reaction, The Curing Temperature By Great Temperature Increased, The Reaction Speed, Gel Time Becomes Shorter; Logarithmic Value With A Generally Linear Increase In Curing Temperature Gelation Time Decreased. But Curing Temperature Is Too High, Often Make The Cured Product Performance, So The Upper Limit Of The Curing Temperature Of Existence; Must Be Selected So That The Curing Speed And Curing Temperature Performance Compromise As A Suitable Curing Temperature. Press The Curing Temperature Of The Curing Agent Can Be Divided Into Four Categories: Low Temperature Curing Agent At A Curing Temperature Below Room Temperature; Room Temperature Curing Agent 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; Domestic Production Of T-31 Developed 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. It Belongs Temperature Curing Type Part Alicyclic Polyamines, Tertiary Amines, Squint Azoles And Boron Trifluoride Complexes. Belonging To High-Temperature Curing Agents Are Aromatic Polyamine, Acid Anhydride, Resole 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 Curing, After Reaching The Gel State Or A State Higher Than The Gel State, And Then The High Temperature Heating After Curing (Post-Cure), The Relative Curing The Pre-Cured Before Paragraph (Pre-Cure).

The Role Of The Curing Agent 

Hard: Concrete Floor After Treatment, Mohs Hardness Will Reach 8 Degrees, Increased By About 200 Percent.Wear: The Various Components Of The Concrete Cured To A Hard Substance, Abrasion Resistance Increased To About 6.4.Friction: Dry Surface Increase Of 22.5%, 47.6% Increase Wet Surface.Dust: Occurs And Concrete Silicate Chemical Reaction To Form A Dense Overall Control Dust Precipitated From The Pores.Slip: To Prevent Precipitation Of Alkali Components From The Surface, Thus Preventing The Concrete Surface Slippery And Efflorescence.Compression: After The Treated Samples Than The Untreated Sample Enhanced 40%, Flexural Strength Increased By More Than 1 Times.Impermeability: Can Effectively Penetrate Into The Pores Of The Concrete Inside The Lock, Inhibiting Water, Oil And Other Contaminants Into The Concrete.Anti-Aging: Effectively Prevent Chlorine Ions And UV Irradiation, The Concrete Will Not Be Affected By Exposure To Electromagnetic Or Mist.Corrosion: The Concrete Floor Of One Month After Treatment, The Corrosion Resistance Is Greatly Improved, Fully Acid After Ten Months.Binding Force: And Epoxy Bonding Force Increase By 21.9%, And Paint Adhesion Basically Unchanged.Conservation Force: A Day In The Concrete Curing Process, The Water Retention Rate Increased 94.5%, To Prevent Cracking.Bright: The Treated Concrete Floor Marble-Like Sheen Will Appear, Use The Longer The Better Gloss.Environmental Protection: Colorless, Odorless, Nonflammable, Non-Toxic And Does Not Contain VOC Substances. Scope: Applies To Any Need To Improve The Performance Of Old And New Concrete.

Epoxy Curing Agents Of Development Direction

With The Continuous Expansion Of Application Fields Of The Curing Agent, Users For Increasingly High Performance Requirements, Which Requires Manufacturers To Continuously Improve Production Technology And Production Processes, To Achieve Higher Performance Requirements, Then The Current Epoxidized Fat The Development Direction Of The Curing Agent Have? Let Xuzhou Institute Of Science And Technology Co., Ltd. Made A Brief Introduction.

First, For The Product Functional Requirements Are Higher, Requires Manufacturers To Produce The Curing Agent Product In Reinforcing Speed, Temperature Changes Solidify And Improve Constantly Be Upgrading The Flame Resistance And Toughness Properties.

Second, Pay Attention To Environmental Protection, The Development Of Non-Toxic Products, General Epoxy Curing Agent Is A Part Of The Toxicity Requires Manufacturers In The Production Process In Future Studies, Upgrade Technology, To The Development Of Non-Toxic.

Third, The Production To Meet The Curing Agent To Different Environments, Some Of The Harsh Environment In The Process Of Curing Agent Used In The Performance Decreases, So It Is Necessary To Enhance The Stability Of The Product To Respond To Different Environmental Changes.

Fourth, Electrical Properties, Mechanical Properties And Other Properties Of The Curing Agent Needs To Be Improved.
At Present The Development Prospects Of The Curing Agent Is Still Very Good, For Manufacturers, The Need To Constantly Improve The Performance Of The Product To Meet The Application Needs Of Different Environments Is Very Important, Which Requires The Continuous Technical Improvement.

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