Polyurethane resin for coated fabrics, dimethylformamide as the wet-coagulation process solvent, and calcium carbonate filler for textile coating and lamination.
Textile coating and lamination chemistries apply or bond a polymer layer tonfabric to add function u2014 water resistance, abrasion resistance, a leather-like hand.nThe base film-former for most coated fabrics and synthetic leathers is polyurethane (PU).nIn the solvent (wet-coagulation) process, PU is dissolved in dimethylformamide (DMF) andncoagulated in a water bath to build the microporous, breathable structure; calcium carbonatenis added as a filler to adjust hand and cost.
nnThe genuine trade-off sits in the solvent. DMF gives PU coagulation its establishednmorphology and surface finish, but it is a restricted substance, which is pushing finishersntoward water-based PU dispersions and solvent-free hot-melt lamination. Those routes cut thensolvent burden; they do not yet match every hand and breathability spec the DMF routendelivers. Decide early which process you are building for, because the PU grade, the fillernloading, and the line are not interchangeable between them.
nnCalcium carbonate is the standard mineral filler in coating compounds: it extends thenpolymer, controls viscosity and opacity, and lowers compound cost without driving the curenchemistry. Dose it to the rheology and hand you need rather than to a fixed ratio. On DMF,nnote the regulatory status plainly: it is identified as a substance of very high concernnunder EU REACH and carries a REACH restriction with a workplace concentration limit. Confirmnregulatory status for your application and jurisdiction.
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