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Precautions for Titanates
Before the selection of coupling agent, should first determine the moisture content of the filler used, according to the wet state and the characteristics of the aforementioned various types of titanate to determine the specific varieties, dry filler should be single alkoxy type, wet filler optional chelate type or single alkoxy pyrophosphate type. In the selection of coupling agent should also consider the melting point of the polymer, crystallinity, molecular weight, polarity, aromaticity, fat foot, copolymer structure, etc., for thermosetting polymers should also take into account the curing temperature and curing mechanism.
The shape, specific surface, moisture content, acidity, alkalinity, chemical composition, etc. of the filler can all affect the coupling effect. Generally, the coupling effect of coarse particle filler is not as good as that of fine particles, but the effect of ultrafine (such as CaCO3 ≥ 2000 mesh) filler is the opposite.
The amount of coupling agent is generally 0.5-3% of the weight of the treated material, and the recommended amount is 0.8-1.5. Its dosage and effect is not a proportional relationship, the amount is too much, but the excess of coupling agent to make the performance decline, (in the plastic in the tensile, impact resistance and other indicators decreased, in the coating, will make the adhesion is greatly reduced, etc.) the amount is too small, because the cover is not complete, the effect is not significant. So in the application to test out the best dosage, so that both economical and effective.
Due to the small amount of titanate coupling agent, in order to make it play its due effect, it must be uniformly dispersed in the filler (or pigment, etc.), otherwise, the coupling effect is not achieved.
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