Acid Resistance Phenolic Resin Suppliers , Synthetic Polymers Bakelite Powder Granular
Pellets Bakelite Phenolic Resin with Low Free Phenol for Foundry Resin Coated Sands
Product description
Bakelite Phenolic resins Pellets are synthetic polymers formed as condensation products of phenols and aldehydes by acid catalyst. The reaction forms novolac resins. These resins are not heat-sensitive.
Warm Coating Process
In this process, the phenolic novolak resin is used in the form of a solution in methanol and water. Powdered hexa is first added to sand heated to 60–90 ℃ in mixing equipment. After a brief mixing period, the alcohol solutionof resin is metered in and the sand thus coated. At the same time, hot air is blown
through the mixer to drive out solvents and water. Calcium stearate is added shortly before the end of the mixing period. The coating process is concluded by cooling and storing the dry, free-flowing resin coated sand
Specification:
| Properties | Value | Test standard |
| Curing time @150°C | 28-32s | GB/T24411-2009 |
| Soften point | 90-92°C | GB/T24411-2009 |
| Free-phenol | 0.5-1.5% | GB/T30773-2014 |
| Appearance | light yellow pellets | GB/T24411-2009 |
Packing&Storage
the package is paper-plastics bag in 25KGS each one
The storage life of this product is several months in a cool and dry place in original closed bags
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