Shanghai – Wanhua and Chinese coatings maker SKSHU Paint have jointly launched new water-based PUD materials for waterproof coatings, after five years of research.
This is the first time such a PUD has been used in waterproof coatings, and the new coatings have been commercialised, said Wanhua.
The coatings include five materials made with three types of systems: aliphatic polyesters, aliphatic polyethers and aromatic polyethers. They will be applied in interior waterproofing, underground waterproofing and durable roof waterproofing.
The materials have low VOC, low odour, and are easier to apply compared with oil-based materials. In addition, they exceed existing water-based materials in durability with 2,500-hour resistance to accelerated weathering, said Wanhua.
The new coatings have at least 4.7MPa tensile strength, 600% elongation at break and 1.7MPa bond strength. These values are markedly higher than China’s current standards for comparable products. They have better heat and alkali resistance as well.
The two companies have also joined efforts to draft segment standards for China’s water-based PUD employed in waterproof coatings.
SKSHU was set up in 2003 and headquartered in Putian, Fujian. The company also sells non-PU coatings and last year recorded CNY6bn ($848m) revenue and CNY406m net profit.
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