Application Of Calcium Carbonate In Polyurethane Sealant

2020-09-11

Summary:Polyurethane has good elasticity, temperature resistance, abrasion resistance and good adhesion to the substrate. Polyurethane products include soft, semi-rigid

Polyurethane has good elasticity, temperature resistance, abrasion resistance and good adhesion to the substrate. Polyurethane products include soft, semi-rigid and rigid foams, elastomers, paint coatings, adhesives, sealants, synthetic leather coating resins, elastic fibers, etc., and are widely used in automobile manufacturing, refrigerator manufacturing, transportation, and civil engineering Construction, footwear, synthetic leather, fabrics, electromechanical, petrochemical, mining machinery, aviation medical, agriculture and many other fields.

Polyurethane reinforcing fillers mainly use carbon black and white carbon black, followed by nano-calcium carbonate. The fillers are mainly used to increase, reduce costs, strengthen, improve physical properties, reduce expansion coefficient and curing shrinkage.

Let's briefly talk about the main influencing factors of nano calcium carbonate in the application of polyurethane sealants.

Since the polyurethane sealant system contains very reactive isocyanate groups (-N=C=O), it is very easy for compounds containing active hydrogen atoms to undergo addition reaction, so the selection of fillers is extremely strict.

In summary, in the application of polyurethane sealants, the moisture, particle size, surfactant, and pH of nano-calcium carbonate will have different effects on product performance.

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