Application of Hydroxyl Silicone Oil in Polyurethane

Structural characteristics of hydroxyl silicone oil

In the hydroxyl silicone oil, the Si-O has high thermal stability; the Si-O-Si bond has a dipole induction effect on the hydrocarbon group connected to the Si atom to improve its stability. The structure of the silicone chain also gives the silicone low surface tension and weak intermolecular force, and the hydroxyl silicone oil has good hydrophobicity due to its special structure. Methyl intermolecular force is inversely proportional to the sixth square of the intermolecular distance. The larger the distance makes the intermolecular force weakened, so the molecular force of dimethyl siloxane is much weaker than that of hydrocarbons, so its surface tension is smaller than that of hydrocarbons with similar molar mass. The low surface tension of polysiloxane makes hydroxyl silicone oil easy to spread on the interface.

 

With the enhancement of people's awareness of environmental protection, the traditional solvent-based polyurethane gradually withdrew from the market and was replaced by a 1 kind of green environmental protection material-waterborne polyurethane. However, hydrophilic chain extenders or hydrophilic chain segments are introduced into waterborne polyurethane during the synthesis process, resulting in poor water resistance. In order to make up for the shortcomings of waterborne polyurethane, the combination of hydroxyl silicone oil and polyurethane is the 1 effective solution. Hydroxyl silicone oil is widely used in modified waterborne polyurethane due to its low surface energy, good hydrophobicity and good weather resistance. Copolymerization of the two is an effective way to overcome the defects of a single polymer. Polyurethane silicone copolymer products have both advantages, such as good flexibility, excellent water resistance, excellent surface enrichment ability, good biocompatibility, and meet a variety of market needs. And polyurethane silicone due to its special structural characteristics, making this softener with other softeners do not have some excellent characteristics, can ensure the fabric excellent soft feel at the same time give the fabric plump elastic dry feel, can meet the needs of high-end use occasions, has broad market prospects.

 

Used as a leather back cover agent

When finishing some leather back cover, the coating is not resistant to the impregnation damage of the solvent in the shoe adhesive, which will cause the coating to peel off. Hydroxyl silicone oil can effectively solve the peeling phenomenon when finishing the back cover because of its good air permeability, weather resistance, corrosion resistance and non-toxic advantages.

 

Textile auxiliaries

In the textile and garment industry, it can be used as a fabric softener, lubricant, waterproof agent, finishing agent, etc. In order to meet the high-end needs of textiles, chemical products are also constantly developing hydroxyl silicone oil that can be used with various functional additives such as waterproofing agents, flame retardants, antistatic agents, and fixing agents. In addition, in order to improve the fabric performance, there are hydroxyl silicone oil products that can be used in the same bath with dyeing, cotton silicone oil with cool feeling, hydroxyl silicone oil products that can improve the fabric hand feeling, and hydroxyl silicone oil deepening agents that can give the fabric excellent deepening effect, good storage stability, no influence on color fastness, good hand feeling, etc. In addition to the functionalization of textiles as additives in textiles, hydroxyl silicone oil products will also be applied to other fields in textiles, such as silicone and polyurethane combination to form a fabric coating; silicone and acrylic polymerization to form a fabric printing; silicone and organic fluorine combination to form a waterproof coating on the surface of the fabric.

 

Application in coating industry

Hydroxyl silicone oil can improve the production process of coatings, maintain the storage stability of coatings, improve their construction process, improve product quality, and endow coatings with some special functions, such as leveling, scratch resistance, anti-adhesion, pigment dispersion, smooth, special surface effects, wetting, hydrophobic, defoaming and foam suppression. Now hydroxyl silicone oil has become an indispensable component in the coating, reasonable and correct selection of hydroxyl silicone oil additives, can effectively reduce costs and improve efficiency. Different coating systems, the selection of hydroxyl silicone oil additives are also different, but each additive has a variety of effects, and sometimes can be used in other systems.