The role of talc in polyurethane coatings

Effect of talcum powder on performance

Talc powder as a filler for polyurethane waterproof coatings, Not only reduces the volume shrinkage of the coating when it is cured, Improve the wear resistance and adhesion of the coating, cut costs, It also enables the coating to have good storage stability and heat resistance. Figure 1, Figure 2 It is the effect of the amount of talc powder on the performance of polyurethane waterproof coatings.

As can be seen from the trend of the curve, The talc as a filler has a similar trend to the elastic elongation and tensile strength of waterproof coatings: That is, as the filler increases, The elastic elongation and tensile strength of waterproof coatings increase first. a maximum appears, Then no more

Cut off, An optimal value appears in the middle. Considering from a molecular perspective, When the amount of talcum powder is extremely small, Particles without talc are dispersed in the middle of the macromolecular segment, Therefore, it is impossible to reduce the attraction between macromolecular segments. Large molecular segments are difficult to move, Resulting in a small elastic elongation of the waterproof coating; As the amount of talc is increased, The small particles are constantly filled between the segments of the macromolecule. The movement of the chain is strengthened, The elastic elongation will increase. When the small inorganic particles of talc just fill the gap between the large molecular chains, At this time, the waterproof coating curing system has the least defects. At this time, the tensile strength and elongation of the waterproof coating reach an optimum value; But too much filler will weaken the force between the macromolecules. Reduce the cohesive energy of the waterproof coating, So that the tensile strength is reduced.

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