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Epoxy silanes are bifunctional organosilanes whose molecules consists of a reactive epoxy group and a hydrolysable alkoxy group. As the main series of silane coupling agents, epoxy silanes have the same capabilities to promote adhesion between organic polymers and inorganic materials. Suitable organic polymers include epoxy, urethane, acrylic, silicone and polysulfide resins. Suitable inorganic materials include glass, metals, dyes, fillers and minerals.

Key Features of Epoxy Silanes

Particularly, epoxy silanes possess a unique property, that is, non-yellowing adhesion. Compared with other functional silanes, for example, amino silanes, epoxy silanes are more stable and won't affect the color of the finished goods. This unique property allows epoxy silanes to be a more suitable epoxy silane adhesion promoter in various coating, sealants and adhesives fields.

Development Status of Epoxy Silanes

At Co-Formula, there are a lots of epoxy functional silanes available, not only commercial ones, but also silanes with special structures. Co-Formula epoxy offerings consist of regular silanes with epoxy and alkoxy groups and special dual-end type epoxy siloxanes. Experts from Co-Formula have been developing new epoxy silanes for a decade, which made Co-Formula became a leader in specialty epoxy silanes production.

Functions & Applications of Epoxy Silanes

Co-Formula epoxy silanes are mainly used as adhesion promoters in coatings, adhesives and sealants industry, where they can promote adhesion, improve inorganic filler dispersion, and especially, enhance anti-corrosive properties. Therefore, for epoxy silanes, marine coating is one of the most essential application fields.

In addition to general-purpose applications in solvent-based resins system, epoxy silanes can also be used in waterborne system. Waterborne coatings are much eco-friendlier than solvent-based coatings. It’s expected that market share of waterborne coatings will be expanded in near future.

More and more customers or end-users from semi-conductors and electricity industries purchase Co-Formula epoxy silanes. Their main end applications are for electronic packaging and electronic encapsulation. These epoxy silanes can improve electrical properties significantly in epoxy-based packaging and encapsulation compounds. Co-Formula epoxy silanes with limited Chlorine content can also enhance the safety and anti-corrosion properties of semiconductors or PCBs.

At Co-Formula, you may find a variety of functional silanes and specialty silanes with distinctive features. Commercial silanes here include Isocyanate Silanes, Amino Silanes, Epoxy Silanes, Phenyl Silanes, Vinyl Silanes, Mercapto Silanes, Alkyl Silanes, Chloro Silanes, Silane Crosslinkers and Long-chain Silanes.

What is epoxy hardener?

The epoxy resin itself is a thermoplastic linear structure. After heating, the solid resin can be softened and melted into a viscous or liquid state. The thermal viscosity of liquid resin decreases. Only when curing agent is added, epoxy resin can be used practically.

Composition of epoxy resin

1. Resin Composition

(1) Epoxy resin: Main component of resin composition, Bisphenol A epoxy resin and other types of epoxy resin

(2) Curing agent: reacting with epoxy resin to form three-dimensional network polymer compounds

1. Modified components

(1) Plasticizers: Plasticizers give flexibility, but reduce heat resistance and drug resistance.

(2) Toughening agent: improve impact resistance, and make other properties reduced little, such as liquid acid carboxylated rubber

(3) Filler: increase weight, improve solidification, mechanical, thermal and electrical properties, such as calcium carbonate, mica, etc.

1. Regulating fluidity components (1) Dilutants: reducing the viscosity of components, which are divided into active diluents and inactive diluents. Thixotropic agent: give thixotropy to components, such as asbestos, silicon powder, etc.

1. Other ingredients: pigments, solvents, defoamers, levelers, tackifiers, etc.

Epoxy hardener chemistry can be widely used because of the combination of these components. Especially curing agent, once the epoxy resin is determined, curing agent plays a decisive role in the technological properties of epoxy resin components and the final properties of curing agent products (products). Epoxy resin itself is a linear structure of thermoplasticity. It can not be used directly. A second component must be added to the resin. Under certain temperature (or humidity) and other conditions, epoxy group of epoxy resin is used for addition polymerization or catalytic polymerization to produce cured materials with three-dimensional network structure (bulk network structure). This compound or resin, which acts as the second component, is called curing agent and is divided into additive curing agent and catalytic curing agent.

Curing agent:

1. Normal temperature curing

Heavy-duty anticorrosive coatings; Civil building adhesives; Civil building coatings; FRP; General binders.

Straight chain aliphatic polyamines, polyamides, alicyclic polyamines, denatured polyamines, polymercaptan

1. Heating curing

(1) Electrical insulating materials: acid anhydride, imidazole compounds, BF3 complex.

(2) Laminating materials: Dicy, aromatic polyamines, linear phenolic resin.

(3) Coatings (Tank: Amino Resin, Phenolic Resin, Powder: Dicy, Aromatic Polyamines, Anhydride).

(4) Molding material: linear phenolic resin.

(5) Binders: Aromatic polyamines, anhydrides, imidazoles, BF3-complexes.

As a one of the most professional epoxy resin and hardener manufacturers, Jiaxing Nanyang Wanshixing Chemical Co. Ltd covers an area of 4 acres with more than 60 employees. We have four advanced production lines and our annual production capacity is 30000 tons, is the largest manufacturer of MTHPA products in China. We sincerely invite and welcome people from all around the world to invest and create more values together.

The principle of epoxy resin hardening reaction is not perfect at present. According to the different hardeners used, it is generally believed that epoxy resin can be thermosetting products through four ways of reaction.

(1) Open-ring connection between epoxy groups;

(2) The epoxy group reacts with the hardener with the active hydrogen functional group and crosslinks.

(3) The epoxy group is crosslinked by the reaction of aromatic or fatty hydroxyl groups in the hardener.

(4) Crosslinking of epoxy group or hydroxyl group with group of hardener

Different kinds of hardeners play different roles in the hardening process. Some hardeners, such as amines, alcohols and phenols, which have single reaction groups, do not participate in the hardening process and only play a catalytic role. The hardener participates in the reaction between macromolecules during the hardening process and forms part of the hardening resin, such as polyamines, polyols, polyanhydrides and other compounds containing multiple reaction groups.

As a professional epoxy hardener manufacturer, Jiaxing Nanyang Wanshixing Chemical Co. Ltd covers an area of 4 acres with more than 60 employees. We have four advanced production lines and our annual production capacity is 30000 tons, is the largest manufacturer of MTHPA products in China. To learn more about the epoxy curing mechanism, please contact us!