Hand feel agents can give products a smooth, soft, astringent, silky, cotton, linen, velvet, oil, wax, stickiness, etc. As the main components of the feel agent are insoluble in water, the leather feel agent can be divided into solvent type and lotion type according to the product state; According to the main active ingredients, it can be divided into wax hand feel agents, organic silicon hand feel agents, and silicon wax composite hand feel agents; Common application effects include wax sensitizers, lubricants, softeners, and multifunctional hand feel agents.
Among the hand feel agents, organic silicon hand feel agents have good effects, multiple varieties, wide applications, and rapid development. Leather treated with organic silicon hand feel agents not only maintains elasticity, fullness, breathability, and hygiene performance, but also improves hand feel and softness. After finishing, it dries quickly and is not easily hardened or brittle. The surface of leather has good stability to water and chemicals, and is not easily deformed, which helps reduce the difference in leather parts. Organosilicon is also the basis for preparing multifunctional hand feel agents, so the preparation of organosilicon hand feel agents has received widespread attention.
Organosilicon hand feeling agent can be divided into solvent type and water lotion type according to product state. Water lotion organosilicon hand feel agent can be further divided into organosilicon lotion, modified organosilicon lotion, silicone wax lotion and organosilicon micro lotion.
At present, the preparation method of solvent based organic silicone leather hand feel agents is to mix organic silicone oils with active groups such as light based silicone oils and appropriate solvents such as alcohols, cyclic ketones, or aromatic hydrocarbons, and stir evenly. Then, catalysts such as dibutyltin dilaurate are added to the mixed solution and stirred evenly to obtain the final product.
The characteristics of solvent based products are good coating waterproofing, simple production process, good stability, but expensive, often toxic, flammable, odorous during operation, and the need to strengthen fire and explosion prevention measures. Due to the poor sanitary performance of solvent based hand feel agent, it will be replaced by lotion based silicone hand feel agent.
The preparation methods of lotion silicone hand feel agent mainly include lotion polymerization and mechanical emulsification, and its basis is to prepare silicone lotion.
The preparation methods of organosilicon lotion can be divided into external emulsification method and internal emulsification method (lotion polymerization method). External emulsification methods include mechanical emulsification, liquid crystal emulsification, D-phase emulsification, etc.
