Qiangli Chemical Product Manual (Latest)

Core rule: The higher the viscosity, the greater the consistency, the denser the film formation, the stronger the lasting performance/mold release capacity, and the poorer the fluidity; 30,000 cSt is of medium-high consistency, balancing fluidity and basic long-acting performance; 50,000 cSt is the golden viscosity in this range, with the optimal comprehensive performance and the widest versatility; 100,000 cSt is of high consistency, focusing on strong mold release and ultra-long-acting film formation/lubrication, suitable for scenarios with high requirements for lasting performance.

Dimethyl silicone oil with a viscosity of 30,000~100,000 cSt is the core commonly used grade of high-viscosity dimethyl silicone oil, featuring high consistency, strong mold release capacity, long-acting lubricity, dense film-forming property, excellent resistance to high and low temperatures (-50~200℃) and low volatility, as well as high chemical inertness. Different from low/mid-viscosity silicone oil which is mainly used for dilution, thin coating and defoaming, it is mainly suitable for industrial and civil scenarios requiring thick film coverage, long-acting performance, anti-adhesion and slip resistance, and strong mold release. It is also the most versatile and practical viscosity grade among high-viscosity silicone oils.

When producing silicone rubber with a Shore D 60 hardness using vinyl silicone oil and hydrogen-containing silicone oil as the crosslinking system, the core selection criteria for vinyl silicone oil lie in controlling its vinyl content (mole fraction/mass fraction) and base viscosity, while matching the hydrogen content and addition ratio of hydrogen-containing silicone oil. It is essential to ensure the crosslinking density is suitable for the crosslinked network requirements of Shore D 60 hardness. Below is a precise and actionable selection scheme, including viscosity, vinyl content, grade references and proportioning principles, applicable to the production process of common addition-cure silicone rubber:

High-viscosity dimethyl silicone oils (generally referring to those with a viscosity of ≥10000 cSt, common specifications are 10000/50000/100000/300000 cSt, and ultra-high viscosity can reach more than 1,000,000 cSt) rely on their excellent viscosity-temperature property, high and low temperature resistance, lubricity, hydrophobicity, mold release property and chemical stability. With high viscosity, they also have stronger film adhesion, damping and buffering performance, and long-term lubrication and sealing effects. As core additives in the industrial, daily chemical, electronic and other fields, their core applications focus on scenarios requiring long-term lubrication, stable mold release, damping and buffering, and sealing protection. The following are the specific applications and technical key points by field, with typical viscosity selection references attached:

Core Solution: Aiming at the non-spreading problem of 1000cst amino silicone oil on steel plates, the core is to reduce surface tension and optimize film-forming spreadability. Combined with the characteristics of the medium-high viscosity of 1000cst, three types of practical solutions are proposed: direct modification (formula adjustment), process optimization and substrate pretreatment, with specific parameters and operating methods attached.

In the copolymerization system of acrylic emulsion and vinyl silicone oil, the selection of vinyl silicone oil viscosity must be core-matched with three key factors: polymerization compatibility, process operability, and target product performance. Silicone oils with different viscosity ranges correspond to different application scenarios, and the specific selection scheme is as follows:

For aminoethyl aminopropyl silicone oil used for bonding silicone rubber and plastic, products with an amine value of 0.3–0.6 mmol/g and a viscosity of 500–5000 mPa·s (25℃) are recommended. This combination balances adhesion enhancement and silicone rubber crosslinking stability; parameters and addition levels can be fine-tuned according to different plastic materials and application scenarios.

Aminoethyl aminopropyl silicone oil (the common material corresponding to the "aminoethyl aminopropyl" you mentioned) can be mixed with vinyl silicone oil, and a properly formulated mixture system can help improve the interfacial adhesion between silicone rubber and some plastics.

The aminoethylaminopropyl-terminated polydimethylsiloxane (AEAPS, diamino-terminated silicone oil) is highly suitable for polyurethane stain-resistant modification. It can significantly improve the hydrophobicity, low surface energy and stain resistance of coatings. Below are the core parameters and application points: