Crosile-69: High-Efficiency Silane Coupling Agent  Chemical Name: Bis[3-(Triethoxysilyl)Propyl]Tetrasulfide        Molecular Formula: C18H42O6S4Si2 Molecular Weight: 538.94        CAS Number: 40372-72-3 Introduction to Crosile-69 Crosile-69 (Bis[3-(Triethoxysilyl)Propyl]Tetrasulfide) is a highly effective silane coupling agent widely used in the rubber industry, tire manufacturing, and composite material modification. Its unique molecular structure significantly enhances the properties of rubber and other materials, improving mechanical performance, filler dispersion, wear resistance, aging resistance, and environmental sustainability. Key Properties of Crosile-69 • Appearance: Low viscosity, light yellow to transparent liquid with a slight odor • Density (ρ20): 1.069 g/cm³ • Sulfur Content: ≥22% • Refractive Index (nD25): 1.493 • Solubility: Easily soluble in many organic solvents (e.g., ethanol, acetone, toluene), but very low solubility in water Functional Groups of Crosile-69 1.Tetrasulfide Bridge (-S4-): The sulfur bridge allows Crosile-69 to undergo crosslinking reactions during rubber vulcanization, improving rubber strength, hardness, and elasticity.   2.Triethoxy Silane Group (-Si-OCH2CH3): Hydrolyzed to form silanol (-Si-OH), which can react with hydroxyl or carboxyl groups in the rubber matrix, strengthening the bond between the rubber and inorganic fillers. Mechanism of Action of Crosile-69 Crosile-69 improves rubber properties through three main reaction mechanisms: 1.Hydrolysis and Condensation Reaction: In the presence of water or moisture, the ethoxy groups in Crosile-69 hydrolyze into silanols (-Si-OH). These silanols react with hydroxyl (-OH) or carboxyl (-COOH) groups on the surface of inorganic fillers, forming siloxane bonds (Si-O-C), enhancing the mechanical properties of rubber. 2.Coupling Reaction with Rubber Matrix: The silane groups in Crosile-69 react with functional groups (e.g., hydroxyl or carboxyl) in the rubber matrix, forming siloxane bonds, which improve the bonding between the rubber and fillers, enhancing properties such as tear resistance and aging resistance. 3.Reaction During Vulcanization: The tetrasulfide bridge (-S4-) in Crosile-69 breaks during vulcanization, generating active sulfur intermediates (such as -SH), which can crosslink with double bonds (C=C) in the rubber matrix, forming a stable vulcanization network and further enhancing rubber performance. Advantages and Characteristics of Crosile-69 • Improved Filler Dispersion: Crosile-69 significantly improves the dispersion of inorganic fillers (e.g., silica, carbon black) in the rubber matrix, reducing filler agglomeration and enhancing the uniformity and physical properties of rubber products. • Enhanced Mechanical Properties: Crosile-69 enhances the tensile strength, tear resistance, shear resistance, and durability of rubber, making it ideal for high-...

Sea Freight Will Go Up! The current dilemmas faced by foreign trade companies: The freight is priced at one price per day, frantically rising; If you are willing to pay this money, you may not be able to get the cabinet; The cabinet is guaranteed, and the boat may not be able to open on time; Finally arrived at the destination port, but the port congestion can only continue to queue up on the sea; Shipments that were not originally a problem have become a major problem since the third quarter of last year. According to statistics from shipping consulting agency Drewry, the global container freight volume in the first quarter of 2021 increased by nearly 9% year-on-year, and the average China Export Container Freight Index (CCFI) was 1960.99 points, an increase of 113.33% compared to the same period last year. Compared with the fourth quarter of the previous year, an increase of 56.8%! Not to mention that at the end of March, Evergreen’s container ships also blocked the Suez Canal, the throat of Asia-Europe transportation. The Danish freighter company Vespucci Maritime pointed out that after Evergreen’s stranding accident, shipping around the world must return to normal, let alone four to six months. Therefore, many foreign traders said with emotion that this year they are not working for the boss, but for the shipping company.