Sinfeng was established in 1998 and has grown into a major supplier of vinyl chloride-acetic acid vinyl series resins in China over the years. Currently, the chloroacrylate series resins are divided into three production processes: aqueous phase suspension method, emulsion method, and micro-suspension method. Among them, the suspension method and micro-suspension method have a production capacity of 18,000 tons per year, while the emulsion method has a production capacity of 5,000 tons per year.
All products of Sinfeng have been tested by professional third-party testing institutions and have successfully passed the pre-registration and formal registration of EU Reach, EU SVHC, US FDA, RoHS, polycyclic aromatic hydrocarbons, phthalic acid salts, and ISO9001, etc.
VMA--Carboxyl-Modified Vinyl Chloride/Vinyl Acetate Terpolymers
| No. | Item | Index | Test method |
| 1 | Appearance | White powder | By visual |
| 2 | Whiteness | ≥80 | GB2913-82 |
| 3 | Composition % by Wt | Vinyl Chloride 81±1% | GB/T7139-2002 |
| Vinyl Acetate 17±1% | ISO1159-1978 | ||
| Maleic Acid 2±0.2% | |||
| 4 | Reactive Functionality (Carboxyl %) |
2±0.2% | |
| 5 | K Value | 32-36 | GB/T 3401-2007 |
| 6 | Viscosity No. ml/g | 30-34 | GB/T 3401-2007 |
| 7 | Glass Transition Temp ℃ | About 70 | GB11998-89 |
| 8 | Average Molecular Wt | About 15000 | Calculated by the Viscosity No. |
| 9 | % by wt, through 60 mesh | 100% | GB/T6003.1 |
| 10 | Apparent density (g/ml) | ≥0.5 | GB20022-2005 |
| 11 | Volatilization (%) | ≤1% | GB/T2914-1999 |
| 12 | Impurity Particle No. /100g | ≤20 | GB9348-88 |
| 13 | 25% resin in MEK/Toluene(50/50) | Colorless and Transparent or yellowish |
By visual |
Application:
VMA grade yields the good balance of solubility and viscosity properties needed for high-build, air-dry maintenance finishes,and it is often used to make coatings and adhesives applications where higher solids are desirable. It can be used in air-dry finishes, such as maintenance,marine,and metal coatings, interbedded adhesive,aluminum foli varnish,UV surface treatment,UV primer,thermal transfer adhesive, shoe adhesive, ink-jet and metal inks,etc.
