Because the active hydrogen in hydrogen-containing silicone oil has strong reactivity, it can react with the hydroxyl group in the ring-opening polymerized hydroxyl-terminated siloxane and form a crosslink, thereby increasing the molecular weight of the product and improving the silicone Alkanes are very beneficial to the feel and maintenance of the feel on the leather surface. Today I will introduce its influence in this respect.
1. The influence of dropping speed
When the dropping speed is too fast, the reaction is very violent, and the mechanical stability of the prepared polymer emulsion is not good. Finally, it is determined that the hydrogen-containing silicone oil is dissolved in some monomers and slowly added to the reaction system, and the prepared emulsion is more stable. good.
2. The effect of dosage on the mechanical stability of the emulsion
When the amount of silicone oil is less than 5% (calculated by monomer mass), the prepared emulsion will not separate or float when it is rotated at a speed of 3000r/m for 30 minutes, indicating that although the introduction of an appropriate amount of silicone oil increases the particle size of the emulsion, But it does not affect its mechanical stability.
3. The effect on the molecular quality of the emulsion
After the silicone emulsion prepared by modification is demulsified by a demulsifier, a flocculent precipitate is obtained. After pouring out the liquid inside, it is dissolved with toluene and butyl acetate as solvents respectively. It was found that the flocculent precipitate could not be dissolved, but only swelled, which indicated that the hydrogen-containing silicone oil participated in the cross-linking reaction, the molecular weight of the polymer increased, and the cross-linking points increased so that it could not be dissolved in the solvent.
4. Effect on monomer conversion rate
The addition of hydrogen-containing silicone oil can increase the conversion rate of ring-opening polymerization to over 90%.
5. Effect on emulsion particle size
It can be combined with the negative charge on the leather surface to form a film on the surface of the leather, so as to control the subsequent coating agent from excessive penetration into the inner layer of the leather, and avoid the stiffness of the finished leather; cationic coating materials have a strong adhesion to the leather , can enhance the bonding fastness between the coating and the leather grain surface layer; the cationic finishing agent has a certain effect of filling, modifying the grain surface and strongly covering the damage of the leather surface. After HPMS/PU coating, the luster is natural, the leather body is soft and plump, the surface is moist, and the quality of the leather is obviously improved.


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