Hindusthan Adhesive & Chemicals

Other Details

An Ester Cured Alkaline Resin binder (Commonly known as Alphaset Resin):

Introduction:

Among the popular no bake organic binder systems namely Acid cured Phenolic. Alkyd & pepset for making moulds & cores at ambient temperature, no one was found environment friendly. To overcome this problem. environment friendly alkaline phenolic binder system has been developed.

COOLSET- 3010/3005:

A two part cold set binder & hardner is a mixture of organic esters, used for making moulds & cores. Both batch and continuous mixers can be used.

Advantage offered by the system:

• Free From Nitrogen, Sulphur & Phosphorous.
• Water Soluble Resin (Core Box, Patterns & Mixers Can Be Washed & Cleaned With Water).
• Non Corrosive Hardners.
• Easy Stripping From The Pattern. No Sticking.
• Can Be Used With All Types Sands Of High Acid Demand Values.
• No Casting Defects With Steel Castings (Free From Veins, Scabs, Erosions & Hot Tears) Due To Excellent High Temperature Properties Superior To Other No Bake Resins.
• Collapsibility Is Very Good.
• Lowest Gas Evolution.
• Offer Reclaimability.
• Excellent Casting Surface.
• High Productivity And Rapid Strength Development.
• Excellent Core Storage.

Disadvantages:

• Use Of Reclaimed Sand Up To 80% But The Resin Application Rate Would Be Same As That Of New Sand.
• Resin Storage Life- Up To 2 Months.
• Low Bench Life And Sand Compatibility

Recipe & Air Set Properties:

Recommended Recipe:

• Resin: 1.8 to 2.2% by Wt. of Sand
• Hardner: 20-22% by Wt, of Resin
• Bench Life can be varied- 4 minutes to 12 minutes.

Conclusion:

• Cost Wise Acid Cure Phenolic No Bake -Cheapest
• Alkyd & Ester Cured Phenolic -More Or Less Equal
• Pepset -Costliest
• Acid Cured Phenolic No Bake Suffers From Sand Alkalinity, Fumes During Mixing & Pouring And Hot Tearing.
• Alkyd System: Poor Hot Strength & Poor Casting Finish.
• Pepset Having Irritating Smell During Mixing, Has Tendency To Veining And Nitrogen Build Up During Reclamation.
• Alkaline Phenolic No Bake Gives Cleanest Environment, Maximum Resistance To Hot Tearing & Finning & Excellent Casting Finish. However It Has Low Flexibility For Bench Life Adjustment & Poor Sand Compatibility.
• However By Putting Continuous Mixer & A Vibration Unit For Sand Compaction. This System Can Be Standardized To Avail Maximum Benefit Including Cleaner Environment.