| CAS No.: | 4420-74-0 |
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| Formula: | C6h16o3ssi |
| EINECS: | 224-588-5 |
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Chemical Name:
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3-Mercaptopropyltrimethoxysilane / (3-Mercaptopropyl)trimethoxysilane
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CasNo.:
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4420-74-0
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Model:
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CFS-740
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Formula:
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C6H16O3SSi
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Color:
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Colorless to light yellow
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Appearance:
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Clear liquid
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Purity:
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min 97%
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Melting point:
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<-50°C
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Boiling point
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212°C [760mmHg]
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Density
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1.0570 g/mL at 25 °C
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CFS-740 is soluble in various solvents. It can be used as a primer in coatings and adhesives industries.
CFS-740 can improve mechanical and electrical properties of silicone rubbers and tires.
CFS-740 can be used as an adhesion promoter and fillers/pigments modifier in coating and sealants industries.
CFS-740 can be used as a surface modifier and an adhesion promoter to prepare silylation surface treatment agents of metal. Other suitable inorganic substrates are glass, silica and kaolin.
CFS-740 can also be used as crosslinkers of organic polymers and resin additives.
CFS-740 can be used to produce finishing agent of textiles and fabrics.
Silane coupling agents can form molecular bridges between polymer and inorganic substrates through chemical reactions or physical interactions, greatly improving the physical, mechanical, and electrical properties of composite materials.
2. Molecular formula
Silane coupling agent is an organic silicon molecule that contains two reactive groups - inorganic reactive groups and organic reactive groups - in the same molecule.
Using the classical structure as Y (CH2) nSi (OR) 3
The OR in the figure refers to the hydrolyzable group - alkoxy, such as methoxy, ethoxy, etc. Alkoxy groups can interact with added or inorganic substances
The residual water on the surface reacts to hydrolyze into hydroxyl groups, which then undergo a condensation reaction with the hydroxyl groups on the surface of inorganic substances, removing a water molecule and forming a strong chemical bond. The Y in the figure refers to organic functional groups, such as amino, methacryloxy, epoxy, vinyl, thiol, etc. Different organic functional groups are suitable for different organic polymers, which can undergo chemical reactions (thermosetting) with polymers or form physical entanglement, interpenetrating network systems (thermoplastic) to form strong chemical bonds.
3. Why use silane coupling agents?
When using glass fiber or mineral fillers to enhance organic polymers, the interface between the polymer and inorganic materials involves many complex physical and chemical factors, which are closely related to the material's binding force, physical strength, insulation performance, and so on. The important destructive factor affecting adhesion is the migration of water to the hydrophilic surface of inorganic reinforcing materials. Water erosion at the interface disrupts the bonding between polymers and reinforcing materials. However, materials treated with coupling agents will form a water resistant bond at the interface between inorganic and organic materials. Silane coupling agents have unique chemical and physical properties, which not only enhance bonding strength, but more importantly, prevent bond dissociation at the interface of composite materials during aging and use. The coupling agent endows two different and difficult to bind surfaces with the ability to stably bind. In composite materials, selecting appropriate silane can significantly improve the bending strength (tensile strength and modulus) of the composite material, while enhancing the material's resistance to humidity and other malignant environmental conditions.
Other advantages that silane coupling agents can provide include:
* Better wetting performance of resin * Moisture resistance and water removal agent
* Building waterproofing *Better dispersion of mineral fillers
Enhanced plastic for clearer and more transparent visibility
4. Mechanism of action on silane coupling agents
Silane coupling agents containing three inorganic reactive groups (usually methoxy, ethoxy, or acetyl) on silicon atoms can effectively bind the metal hydroxyl groups of most inorganic materials, especially those with structures containing silicon, aluminum, or heavy metals. By reacting with residual water added or on inorganic surfaces, the silicon oxide groups on silicon atoms are hydrolyzed into silanols, which then react with metal hydroxyl groups on inorganic surfaces to form alkoxy structures and remove water. Silanes can also combine with each other to form a multi-molecular structure of silane coupling agents. Usually, more than one layer or equivalent layer of silane is used on the surface. This will form a dense siloxane layer on the surface of inorganic materials and move the inorganic surface further away from the interface.
5. The reaction mechanism of silane on polymers
The binding of silane to organic polymers is very complex. The reactivity of thermosetting polymers should match that of silane. For example, epoxy silicon
Alkane or amino silane will combine with epoxy resin; Aminosilane will combine with phenolic resin; Methacrylate based silane will be combined with styrene crosslinked in unsaturated polyester resin. For thermosetting polymers that play an important role in reactivity, matching chemical structures can improve the physical properties of composite materials. The reaction between silane and resin generally takes the following three forms
Equation:
*Grafting * Chemical bonding * Copolymerization
For thermoplastic polymers, the binding achieved through silane coupling agents can be explained as mutual diffusion and interpenetrating networks in the interface region
Formed by the network system. Therefore, for thermoplastic resins, the compatibility between silane and resin is very important. Match the solubility of two materials
This parameter will help increase the probability of forming practical composite materials with optimal performance.
6. This product is particularly suitable for various sulfur vulcanization and metal oxide vulcanization systems of rubber. It can significantly improve the mechanical strength of rubber (especially 300% tensile stress and tear strength) with inorganic fillers (such as white carbon black, kaolin, aluminum hydroxide, magnesium hydroxide, talc powder, etc.), significantly reduce fatigue heat generation, permanent deformation and wear, and improve its processing rheological properties. Its effect is particularly significant in light colored rubber products. This product can be used for pre-treatment of mineral fillers, or added together during rubber mixing.
7. This type of product can replace polysulfides (such as SCA-S69X) in formulations such as green, environmentally friendly, energy-saving tires with low rolling resistance, rubber shoe soles, rubber rollers, light colored rubber conveyor belts, and rubber cables, achieving the same performance with minimal usage. When using this alternative, it is necessary to appropriately reduce the amount of promoter in the formula and increase the amount of sulfur donor.
8. This product can be used as a bonding promoter in the formulation of polyurethane and polysulfide sealant, as well as for the end modification of isocyanates, endowing polyurethane sealant with the characteristics of wet vapor curing, excellent adhesion and weather resistance.
FAQ:
Q1:Can I get some samples?
A: Yes, we can supply the free sample,customer only need bear the shipping cost.
Q2:How to start orders or make payments?
A: Proforma invoice will be sent first after confirmation of order, enclosed our bank information. Payment by T/T,Western Union or Paypal or secure payment.
Q3: How about delivery lead time?
A: About 7-10 days after payment confirmed.(Chinese holiday not included).
Q4:Is there any discount?
A: Different quantity has different discount.
Q5: How to ship it?
A: For small order, we would send by express such as Fedex, DHL, etc. For large order, we would send by air or sea.
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