| 摘要 |
In the invention, even when a heat exchanger or a component used for the heat exchanger (object component) is adhered with pollution matter such as VOC and the like, the pollution matter can be cleaned by dew generated on the surface of the object component. In the invention, water soluble resin used for coating composite used for coating the object component and capable of maintaining high hydrophilic of the object component for a long term is provided. It is characterized in that the water soluble resin is a polymer of 3-allyloxy-2-hydroxy-1-propanesulfonic acid (HAPS) or salt thereof and acrylic acid or salt thereof. The mole ratio of the composition module of the HAPS or the salt thereof and the composition module of all monomer in the polymer is around 23%. And the average molecular weight of the polymer is more than 50 thousand. The product (MH * MW) of the ratio and the average molecular weight is more than 300000 and less than 5000000. |
