COOLSET- 3010/3005:
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: | |
| 1. | Free from Nitrogen, Sulphur & Phosphorous. |
| 2. | Water soluble Resin (Core box, patterns & mixers can be washed & cleaned with water). |
| 3. | Non corrosive hardners. |
| 4. | Easy stripping from the pattern. No sticking. |
| 5. | Can be used with all types sands of high acid demand values. |
| 6. | 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. |
| 7. | Collapsibility is very good. |
| 8. | Lowest gas evolution. |
| 9. | Offer reclaimability. |
| 10. | Excellent Casting surface. |
| 11. | High productivity and rapid strength development. |
| 12. | Excellent core storage. |
| Disadvantages: | |
| 1. | Use of reclaimed sand up to 80% but the resin application rate would be same as that of new sand. |
| 2. | Resin Storage Life- up to 2 months. |
| 3. | 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. |
The Chemistry of Curing: Click here
CONCLUSION:
-- Cost wise acid cure phenolic no bake -Cheapest
--Alkyd & Ester cured phenolic -More of 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.