Phenol-formaldehyde resin-resorcinol separator

Figure 3. Phenol-formaldehyde resin resorcinol separator (SEM)...

Phenol-Formaldehyde Resin Resorcinol Separators (DARAK 2000/5005)... 

Phenol-Formaldehyde Resin-Resorcinol Separators (DARAK 2000/ 5005) The production process and the principal properties of this system have been described in detail in the section on traction battery separators (see Section 11.2.3.1). The outstanding properties, such as excellent porosity (70%) and resulting very low acid displacement and electrical resistance, come into full effect when applied in open stationary batteries. Due to the good inherent stiffness the backweb may even be reduced to 0.4 mm, reducing acid displacement and electrical resistance to low levels that are not achievable by any other system. Furthermore, the phenolic resin-resorcinol separator neither generates any harmful substances nor is it attacked chemically or by oxidation. The sum of these properties has made it the preferred separator for open stationary batteries. 

The condensation of resorcinol, chloroacetic add, and formaldehyde in alkaline medium gives a bifunctional cation-exchange resin containing —COOH and —OH groups . The condensation of salicylic add with formaldehyde in add medium followed by treatment with phenol in alkaline medium also gives a bifiinctional resin which is suitable for separation and purification of proteins . A bifunctional cation-... 

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