Silicone hydroxy silicone oil is a polysiloxane with hydroxyl end group, oily liquid, and has the characteristics of methyl silicone oil. Hydroxyl silicone oil with low viscosity is an excellent structure control agent in silicone rubber processing, which can replace diphenylsilyl glycol, 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, and is widely used in coatings, electronic and electrical, biomedical, food, personal care and other fields.

Structural characteristics of hydroxyl silicone oil
In hydroxyl 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, which can improve its stability. The structure of siloxane chain also endows silicone with low surface tension and weak intermolecular force, and hydroxyl silicone oil has good hydrophobicity due to its special structure. The intermolecular force of methyl is inversely proportional to the sixth power of the intermolecular distance, and the intermolecular force will be weakened as the distance changes. Therefore, the molecular force of dimethylsiloxane 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 increase of people's awareness of environmental protection, the traditional solvent based polyurethane gradually withdrew from the market and was replaced by a green environmental protection material - waterborne polyurethane. However, hydrophilic chain extenders or hydrophilic segments were introduced in the synthesis of waterborne polyurethane, which led to its poor water resistance. In order to compensate the deficiency of waterborne polyurethane, the combination of hydroxyl silicone oil and polyurethane is an effective solution. Hydroxyl silicone oil is widely used to modify waterborne polyurethane due to its low surface energy, good hydrophobicity, good weather resistance and other advantages.

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, and good biocompatibility, meeting a variety of market demands. In addition, due to its special structural characteristics, polyurethane silicone makes this softener have some excellent characteristics that other softeners do not have. It can not only ensure the excellent soft feel of the fabric, but also give the fabric a full, elastic and dry feel. It can meet the needs of high-end wear occasions, and has broad market prospects.

Used as leather finishing agent
The film forming materials in the finishing layer have a great influence on the physical properties of the finished leather, especially the top coating gives the finished leather surface water resistance, solvent resistance, mechanical scratch resistance and other properties, which play a decisive role in the appearance of the leather. Due to the introduction of hydrophilic ionic groups in the molecular chain of polyurethane, the leather coated with polyurethane has poor water resistance, which can be improved by adding hydroxyl silicone oil. Hydroxyl silicone oil is a kind of material with good hydrophobicity, air permeability and weather resistance. When it is used in the synthesis and modification of waterborne polyurethane, the leather after finishing will have better wet abrasion resistance and feel smoother and more comfortable.

Used as leather backing agent
When finishing the back seal of some leather, because the coating is not resistant to the immersion damage of the solvent in the shoemaking adhesive, the coating will peel off. Hydroxyl silicone oil can effectively solve the peeling phenomenon when finishing the back seal 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 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 in the same bath as various functional additives such as waterproof agent, flame retardant, antistatic agent and color fixative, and has a good feel. In addition, in order to improve the performance of the fabric, there are hydroxy silicone oil products that can be used in the same bath with dyeing, cotton silicone oil with a cool feeling, hydroxy silicone oil products that can improve the hand feel of the fabric, and hydroxy silicone oil type deepening agents that can give the fabric excellent deepening effect, good storage stability, do not affect the color fastness, and have a good hand feel. In addition to the functionalization of textiles as additives in textiles, hydroxyl silicone oil products will also be used in other fields of textiles, such as the coating of fabrics formed by the combination of organic silicon and polyurethane; Printing of fabrics formed by polymerization of organic silicon and acrylic acid; Organic silicon and organic fluorine are combined to form a waterproof coating on the fabric surface.

Applied in coating industry
Hydroxyl silicone oil can improve the production process of the coating, maintain the storage stability of the coating, improve its construction technology, improve product quality, and endow the coating with some special functions, such as leveling, scratch resistance, adhesion resistance, pigment dispersion, smoothness, special surface effect, wetting, hydrophobic, defoaming and foam suppression. Now 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 benefits. Different coating systems use different hydroxyl silicone oil additives, but each additive has multiple effects, and sometimes it can also be used in other systems.