Hydroxy silicone oil
Silicone hydroxy silicone oil is a polysiloxane having a hydroxyl group end group, an oily liquid, and is characterized by methyl silicone oil. The low viscosity hydroxy silicone oil is an excellent structural control agent in the processing of silicone rubber, which can replace diphenyl silane diol, simplify the process and improve the process performance. It is also used as a waterproof, soft and anti-sticking agent for fabrics, leather and paper. It is widely used in coatings, electrical and electronic, biomedical, food, personal care and other fields.
 
Hydroxy silicone oil structure characteristics
In the hydroxy silicone oil, 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 siloxane chain also imparts low surface tension and weak intermolecular forces to the silicone, and the hydroxy silicone oil has good hydrophobicity due to its special structure. The interaction between methyl molecules is inversely proportional to the sixth power of the distance between molecules. The distance becomes larger and the intermolecular force is weakened. Therefore, the molecular force of dimethylsiloxane is much weaker than that of hydrocarbons, so it The surface tension is smaller than hydrocarbons of similar molar mass, and the low surface tension of the polysiloxane makes the hydroxy silicone oil easy to spread at the interface.
 
With the reluctance of environmental awareness, the traditional solvent-type polyurethane has gradually withdrawn from the market and replaced with a green environmentally friendly material - waterborne polyurethane. However, aqueous polyurethanes introduce hydrophilic chain extenders or hydrophilic segments during the synthesis, which results in poor water resistance. In order to compensate for the shortage of waterborne polyurethane, the combination of hydroxy silicone oil and polyurethane is an effective solution. Hydroxy silicone oil is widely used in modified waterborne polyurethane due to its low surface energy, good hydrophobicity and good weather resistance. It is an effective way to overcome the defects of single polymer by copolymerizing the two. Polyurethane silicone copolymer has both The advantages of both, such as good flexibility, excellent water resistance, excellent surface enrichment ability, good biocompatibility, meet a variety of market needs. And due to its special structural characteristics, polyurethane silicone has some excellent features that other softeners do not have. It can ensure the fabric's excellent softness and feel while giving the fabric a full, elastic and dry feel. The demand for occasions has broad market prospects.




 
Used as a leather finish
The film-forming material in the finishing layer has a great influence on the physical properties of the finished leather. In particular, the top coating imparts water, solvent and mechanical scratch resistance to the surface of the finished leather, and plays a decisive role in the appearance of the leather. Polyurethanes have poor water resistance due to the introduction of hydrophilic ionic groups in the molecular chain, which can be improved by the addition of hydroxy silicone oil. Hydroxy silicone oil is a kind of material with good hydrophobicity, gas permeability and weather resistance. It is used in the synthetic modification of waterborne polyurethane. The leather obtained after finishing will have better wet rub resistance and feel smoother. Comfortable.


 
Used as a leather sealant
When some leather backing is applied, the coating is not resistant to the impregnation of the solvent in the shoe adhesive, which may cause the coating to peel off. The hydroxy silicone oil has the advantages of good gas permeability, weather resistance, corrosion resistance and non-toxicity. Effectively solve the peeling phenomenon when the back cover is painted.
 
Textile auxiliaries
In the textile and garment industry, it can be used as a softener, lubricant, waterproofing agent, finishing agent, etc. for fabrics. In order to meet the high-end needs of textiles, chemical products are also constantly developing hydroxy silicone oil which can be used in the same bath as various functional additives such as water repellent, flame retardant, antistatic agent and fixing agent. In addition, in order to improve the performance of the fabric, there is also a hydroxy silicone oil product which can be used in the same bath as the dyeing, a silicone oil which has a cool feeling, a hydroxy silicone oil product which can improve the fabric feel, and an excellent deepening effect and storage stability of the fabric. Good, does not affect the color fastness, feel good hydroxy silicone oil deepening agent. In addition to the functionalization of textiles as an additive in textiles, hydroxy silicone oil products will also be applied to other areas of textiles, such as silicone and polyurethane combined to form a coating of fabric; silicone and acrylic acid polymerize to form a fabric print; organic Silicon is combined with organic fluorine to form a water-repellent coating on the surface of the fabric.
 


Used in the coatings industry
Hydroxy silicone oil can improve the production process of coatings, maintain the storage stability of coatings, improve the construction process, improve product quality, and impart some special functions to coatings, such as leveling, scratch resistance, anti-blocking, pigment dispersion, smoothing, Surface special effects, wetting, hydrophobic, defoaming and foam suppression. Nowadays, hydroxy silicone oil has become an indispensable component in coatings. Reasonable and correct selection of hydroxy silicone oil additives can effectively reduce costs and improve efficiency. The choice of hydroxy silicone oil additives varies from coating system to system, but each auxiliary has multiple functions and can sometimes be used in other systems.
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