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Evonik

Organofunctional Silanes

Evonik has developed a range of Silanes helping to reach higher performance to adhesives and sealants and brings excellent substrate adhesion, mechanical strength, storage stability, chemical resistance among many other benefits.

Dynasylan® Silanes

Improve product performance

Improve product performance

Adhesives or Sealants formulators traditionally use Silanes to solve specific technical issues where adhesive strength and/or long-term adhesive stability are needed.

By adding only a small amount of Dynasylan® Silane to the formulation (0.1 - 2.5 wt.- %), key benefits can be provided to the final Adhesive or Sealant:

 

Excellent Substrate Adhesion
Excellent substrate
adhesion
mechanical Strength
Mechanical
strength
Storage Stability
Storage
stability
Polymer modification
Polymer
modification
Crosslinking
Crosslinking

Chemical Resistance
Chemical
resistance
Moisture resistance
Moisture
resistance

Excellent substrate adhesion

Dynasylan® Organofunctional silanes act as adhesion promoters or coupling agents between inorganic materials (glass, minerals, and metals) and organic polymers (thermosets, thermoplastics, and elastomers).

Silanes when used as adhesion promoters or as polymer modifier (e.g. PU prepolymer endcapper) can increase the adhesion of any Adhesive or Sealant with the substrate to be bonded.

As an illustration, Dynasylan® GLYMO improves the wet adhesion of an adhesive used to bond glass and aluminum:



Wet adhesion of a Latex Sealant

Figure 1: Wet adhesion of a Latex Sealant on Aluminum and Glass, with and without Dynasylan® silanes.


Dynasylan® AMMO and Dynasylan® 1146 improve the dry adhesion on wooden surfaces:

 Dry adhesion of a SMP-based adhesive

Figure 2: Dry adhesion of a SMP-based adhesive with and without Dynasylan® silanes

In addition, the resulting bonded assembly will exhibit increased durability especially better resistance to the moisture that can appear between the Adhesive/Sealant and the substrate.


Various Dynasylan® products can act as Adhesion promoters:

Adhesion Promoter Technical features
Dynasylan® 1146 Non-sensitizing, low VOC, prevent premature failure in wet environments, low yellowing
Dynasylan® 1124 Polymer modifier (endcapper), effective in PU systems, good adhesive properties on hard-to-bond materials
Dynasylan® SIVO 210 Can be used as a cost-effective aminosilane system instead of AMEO, especially for oxime silicones
Dynasylan® AMMO Fast reacting aminosilane with well-balanced reactivities and good adhesion performance
Dynasylan® TRIAMO Triamino-functional silane with overall good adhesion performance in silicones
Dynasylan® SIVO 202 New aminosilane system for SMP and silicone based adhesives to improve adhesion to PVC
Dynasylan® SIVO 203 New aminosilane system for SMP and silicone based sealants to improve adhesion to plastics
Dynasylan® GLYMO Versatile silane for epoxies, latices, polysulfides and polyurethanes; excellent adhesion on glass
Dynasylan® GLYEO Environmentally friendly, no methanol release equivalent of Dynasylan® GLYMO, higher level of water stability

Mechanical strength / properties

Whether the selected Dynasylan® is an adhesion promoter, a crosslinker or a drying agent, adding silanes in your Adhesive or Sealant formulation will drastically improve the uniformity of cure thereby optimizing the mechanical performance.

In the case of Polyurethane prepolymers, silanes can be used as endcappers to react with the free NCO groups of the isocyanate-terminated PU. Endcapping provides key benefits to these hybrid systems:
  • Higher mechanical performance
  • Lower viscosity silane-modified prepolymer, faciliting any further processing
  • Compliance with REACH regulation in Europe due to the reduction of free NCO groups in the Adhesive/Sealant

The silane adhesion promoter has a b impact on mechanical properties of SMP-systems:

Elongation of a SMP sealant

Figure 1: Elongation of a SMP sealant CaCO3 filled SPU-sealant incl. 1,1 wt.-% silane adhesion promoter



There are several Dynasylan® grades that can help achieving/tailoring mechanical strength:

Mechanical Strength Silanes Technical features
Dynasylan® DAMO-T Standard aminosilane, sensitizing, fast curing
Dynasylan® 1146 Preferred aminosilane for low modulus products, low VOC, low odour, non-sensitizing
Dynasylan® 1189 Best choice for products with high elasticity
Dynasylan® 1124 Recommended for high strength products
Dynasylan® SIVO 202 New aminosilane system for SMP and silicone based adhesives to improve adhesion to PVC


Dynasylan® 1189 is more than an endcapper, it greatly improves elongation:

Endcapper improves elongation

Figure 2: Test in SPUR® - 1,1% Dynasylan® used

Storage stability / water scavenger

Silanes used as drying agents can capture any latent moisture present in the immediate environment.

This moisture absorption capability helps to increase the shelf life of the stored product and to prevent any premature cure by avoiding the reaction between moisture and the active groups in the Adhesive or Sealant.


 

Shelf Life of a silane terminated polyurethane Sealant

Figure 1: Shelf Life of a silane terminated polyurethane Sealant at 50°C, 
with and without Dynasylan® Silanes. In this specific example, the recommended dosage is 1.4%.


On top of that, the mechanical strength will be improved especially in the case of SMP (hybrid) Sealants.

Here are some Dynasylan® grades particularly suitable to improve storage stability:

Storage Stabilizing Silanes Technical features
Dynasylan® VTMO Product of choice, ideal reactivity to scavenge moisture
Dynasylan® VTMOEO High boiling point, suitable for e.g. polysulfide sealants
Dynasylan® 6490 Low VOC, low odor silane oligomer, acts as a chemical lid for freshly bottled adhesives

Polymer modification (endcapper)

Silanes can modify polymers either when used as a co-monomer during the polymer synthesis or when reacting with an already existing pre-polymer.

NCO-free and bubble-free systems

 

In addition to providing more formulation options and allowing NCO-free and bubble-free systems, Silane modification improves the overall performance of the polymer by helping to achieve:

  • Improved mechanical performance (tensile strength, elongation at break, hardness)
  • Good adhesion
  • Scratch resistance
  • Scrub resistance
  • Thermal stability
  • Weathering stability
  • Good electrical properties

 

Several Dynasylan® grades can be used as Polymer modifiers:


Polymer modifying Dynasylan Technical features
Dynasylan® 1189 Ideal PU Endcapper, less polar, improves UV stability
Dynasylan® 1122 Fast reaction with NCO groups (also without catalyst), increased cohesion through double silicon function, methanol free
Dynasylan® 1124 Fast reaction with NCO groups (also without catalyst), increased cohesion through double silicon function
Dynasylan® MEMO Methacrylate-functional silane, suitable for e.g. acrylics
Dynasylan® VTMO Vinyl-functional silane, suitable for grafting or copolymerization within polyolefins
Dynasylan® VTEO Vinyl-functional silane, methanol free, suitable for water-based products

Crosslinking

Dynasylan® products have long been used to crosslink polymers such as silicones, polyethers, epoxies, polyethylenes, polyacrylates, polyurethanes, and others. Crosslinking occurs in the presence of moisture.

 

Crosslinking occurs in the presence of moisture

 

This cost-efficient technology is used in many application fields.

As an example, Dynasylan® Organofunctional silanes are used to crosslink tailormade RTV-1 alcoxy silicones to seal shower stalls, structural glazing for all-glass constructions, etc.

 

Crosslinking Dynasylan® Technical features
Dynasylan® A Tetrafunctional, methanol free
Dynasylan® 40 Multifunctional, ethoxysilane oligomer, VOC reduced
Dynasylan® P Tetrafunctional, slower reactivity
Dynasylan® VTMO Trifunctional, less crosslinking sites
Dynasylan® PTMO Trifunctional, lower reactivity

Chemical resistance

Silanes added in the formulation as adhesion promoters, endcappers and/or crosslinkers increase the crosslinking density of the Adhesive or Sealant and improve the performance of the assembly against chemicals even in harsh conditions.

Dynasylan® AMMO and Dynasylan® 1189, when used in SPU Sealants, improve the shear resistance even when joints are immersed 22 days in Isopropanol.

Lap shear strength of an SPU Sealant

Figure 1: Lap shear strength of an SPU Sealant after 22 days ageing in Isopropanol
(Test performed on Aluminum)

 

The following Dynasylan® grades are recommended when Adhesives and Sealants formulators are looking for improving the chemical resistance:

 

Chemical Resistance Silanes Technical features
Dynasylan® AMMO Adhesion promoter; non-sensitizing, fast curing
Dynasylan® 1189 Endcapper, fast-reacting with free NCO groups, no side reaction, UV stable, higher hydrophobicity compared to AMMO

Moisture resistance

As adhesion promoters and PU endcappers, Silanes increase the durability of adhesion between the Adhesive or Sealant and the substrate. They provide better resistance to moisture and prevent premature adhesion failure.

Dynasylan® 1189 and low VOC Dynasylan® 1146 oligomer are the right Silane solutions to prevent adhesion failure when Adhesives or Sealants are in a humid environment.They help to improve the shear resistance of an SPU sealant even when a joint is immersed 6 days in water.
Lap shear strength of an SPU Sealant after 6 days

Figure 1: Lap shear strength of an SPU Sealant after 6 days ageing in water at room temperature
(Test performed on Aluminum at 23°C)

 

In addition, Dynasylan® 1146 can minimize water uptake in MS Polymer sealants:

 

Water uptake - Dynasylan in MS Polymer Sealants

Figure 2: Water uptake - Dynasylan® 1146 in MS Polymer Sealants For this test, 

the hybrid sealant specimen was stored in H2O at 23°C


Dynasylan® 1189 and Dynasylan® 1146 can help Adhesive and Sealant formulators to increase the moisture resistance of the final product:

 

Moisture Resistance Silanes Technical features
Dynasylan® 1146 Non-sensitizing adhesion promoter, low VOC, imparts hydrophobicity
Dynasylan® 1189 Ideal PU Endcapper, less polar, improves UV stability

End use applications

Polymer systems

Dynasylan®: a multi-purpose technology

Infographic: Technology overview

Oligomers selection guide

Structural Adhesives selection guide

The right silane for your application

Primer selection guide

Epoxy Functional Silanes

Silanes for Reactive PU Hotmelts

Product Datasheets

Dynasylan® VPS 4721

Dynasylan® VPS 4721 by Evonik functions as a crosslinking agent, adhesion promoter and/or surface modifier. It is a high molecular weight, bifunctional organosilane possessing a reactive organic epoxide and hydrolyzable inorganic methoxysilyl groups. It can bind chemically to both inorganic material...

Dynasylan® GLYMO

Dynasylan® GLYMO by Evonik acts as an adhesion promoter, crosslinking agent and/or surface modifier. It is a low viscosity bifunctional organosilane, 3-glycidyloxypropyltrimethoxysilane with a slight terpentine-like odor. It is an essential ingredient in sealants and adhesives, as a primer or additi...

Dynasylan® VPS SIVO 260

Dynasylan® VPS SIVO 260 by Evonik acts as an adhesion promoter. It is a modified organofunctional silane oligomer. Exhibits excellent wetting on substrates as well as weather and moisture resistance. Possesses balanced mechanical properties and shows VOC-reduction compared to conventional amino-sila...

Dynasylan® VPS SIVO 280

Dynasylan® VPS SIVO 280 is an adhesion promoter by Evonik. It is based on a modified organofunctional silane oligomer. Possesses balanced mechanical properties and shows VOC-reduction compared to conventional amino-silanes. Designed for adhesives and sealants for hybrid products including silylated ...

Dynasylan® 1146

Dynasylan® 1146 is a diaminofunctional silane by Evonik. Acts as an adhesion promoter. Exhibits very good wetting on substrates and forms weather- and moisture-resistant bonds to substrates with difficult adhesion properties. Provides improvement in elongation and modulus. Used in adhesives and seal...

Dynasylan® 1189

Dynasylan® 1189 by Evonik is a bifunctional silane. Acts as an adhesion promoter or as a surface modifier. Provides flexural strength, tensile strength, impact strength, modulus of elasticity, improved moisture and corrosion resistance. Offers improvement in adhesion, filler dispersion rheological b...

Dynasylan® 1505

Dynasylan® 1505 by Evonik is a 3-Aminopropylmethyldiethoxysilane. Acts as an adhesion promoter between inorganic materials like glass, metals and fillers and organic polymers and as a surface modifier. Provides improvement in mechanical properties, for example flexural strength, tensile strength, im...

Dynasylan® 6490

Dynasylan® 6490 by Evonik is a vinyl silane concentrate. Acts as an adhesion promoter, dispersion and hydrophobing agent in mineral filled compounds. Offers benefits such as improved filler dispersion, good processability, significantly reduced water-uptake, good balance between tensile strength, el...

Dynasylan® AMEO

Dynasylan® AMEO by Evonik is a 3-aminopropyltriethoxysilane grade. Acts as an adhesion promoter, crosslinker, and/or surface modifier. Provides improved mechanical properties like flexural strength, tensile strength, impact strength and modulus of elasticity. Shows improved moisture and corrosion re...

Dynasylan® AMMO

Dynasylan® AMMO by Evonik is a 3-Aminopropyltrimethoxysilane grade. Acts as an adhesion promoter and a surface modifier. Exhibits corrosion resistance and improved electrical properties like dielectric constant & volume resistivity. Imparts improved mechanical properties including flexural strength,...

Dynasylan® 1506

Dynasylan® 1506 by Evonik is 3-Aminopropylmethyldiethoxysilane. Acts as an adhesion promoter, surface modifier and as a reactant for product modification. Provides improved mechanical properties like strength, impact strength and modulus of elasticity and improved moisture resistance. Offers increas...

Dynasylan® BDAC

Dynasylan® BDAC by Evonik is di-t-butoxydiacetoxysilane. Acts as adhesion promoter. It possesses reactive acetoxy groups that in presence of water, hydrolyze easily and form reactive silanol groups, which can bond to various substrates. During hydrolysis acetic acid is released. Dynasylan® BDAC is s...

Dynasylan® 1411

Dynasylan® 1411 by Evonik is a N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane. This grade acts as an adhesion promoter, surface modifier and as a reactant for product modification. Offers improved mechanical properties like strength, impact strength and modulus of elasticity, improved moisture,...

Dynasylan® MTMO

Dynasylan® MTMO by Evonik is a 3-mercaptopropyltrimethoxysilane compound. Acts as an adhesion promoter, crosslinking agent, surface modifier or reactive reagent. Provides improved mechanical properties like flexural strength, tensile strength, impact strength and modulus of elasticity, tear strength...

Dynasylan® MEMO

Dynasylan® MEMO by Evonik is a 3-methacryloxypropyltrimethoxysilane grade. Acts as an adhesion promoter, surface modifier, co-monomer for polymer synthesis and crosslinker. Provides optimum dispersion of the fillers and pigments, reduction in settling of the fillers and pigments. Offers reduced visc...

Dynasylan® GLYMO

Dynasylan® GLYMO by Evonik acts as an adhesion promoter, crosslinking agent and/or surface modifier. It is a low viscosity bifunctional organosilane, 3-glycidyloxypropyltrimethoxysilane with a slight terpentine-like odor. It is an essential ingredient in sealants and adhesives, as a primer or additi...

Dynasylan® VTMO

Dynasylan® VTMO by Evonik is a vinyltrimethoxysilane grade. Acts as a crosslinking agent, adhesion promoter, surface modifier and moisture scavenger. Provides improvement in tear- and crack resistance, chemical resistance, abrasion resistance and memory effect. Offers improved corrosion resistance a...

Dynasylan® 1124

Dynasylan® 1124 by Evonik is a bis(trimethoxysilylpropyl)amine grade with excellent crosslinking properties. Acts as an adhesion promoter and surface modifier. This grade provides improvement in flexural strength, tensile strength, impact strength, modulus of elasticity, moisture and corrosion resis...

Dynasylan® DAMO-T

Dynasylan® DAMO-T by Evonik is based on N-(2-aminoethyl)-3-aminopropyltrimethoxysilane. Acts as an adhesion promoter and surface modifier. Provides improved flexural strength, tensile strength, impact strength and modulus of elasticity. Offers improved moisture and corrosion resistance. Dynasylan® D...

Dynasylan® DAMO

Dynasylan® DAMO by Evonik is based on N-2-Aminoethyl-3-aminopropyltrimethoxysilane. Acts as an adhesion promoter. Offers improved flexural strength, tensile strength, impact strength and modulus of elasticity. Provides improved moisture and corrosion resistance. Dynasylan® DAMO is listed in EINECS/E...

Dynasylan® GLYEO

Dynasylan® GLYEO by Evonik is a 3-glycidyloxypropyltriethoxysilane compound. Acts as an adhesion promoter, crosslinking agent and/or surface modifier. Provides improved mechanical properties like flexural strength, tensile strength, impact strength and modulus of elasticity. Offers improved moisture...

Dynasylan® VTEO

Dynasylan® VTEO by Evonik is a vinyltriethoxysilane grade. Acts as a crosslinking agent, adhesion promoter and/or surface modifier. Possesses moisture scavenging properties. Offers improved corrosion or scratch resistance, improved adhesion strength in wet conditions, wet scrub resistance and improv...

Dynasylan® SIVO 202

Dynasylan® SIVO 202 by Evonik is a multifunctional aminosilane grade. Acts as an adhesion promoter. Provides improved product performance and quality. It is soluble in alcohols, aliphatic and aromatic hydrocarbons, but it can undergo reactions with ketones or ester solvents. Exhibits excellent wetti...

Dynasylan® 1122

Dynasylan® 1122 by Evonik is a bis(3-triethoxysilylpropyl)amine grade. It is an adhesion promoter and a surface modifier. Provides good flexural strength, tensile strength, impact strength and modulus of elasticity. Offers benefits such as improved moisture and corrosion resistance, improved rheolog...

Dynasylan® SIVO 203

Dynasylan® SIVO 203 by Evonik is a multifunctional aminosilane compound. Acts as an adhesion promoter. Provides improved product performance and quality. It is soluble in alcohols, aliphatic and aromatic hydrocarbons, but it can undergo reactions with ketones or ester solvents. Exhibits excellent we...

Dynasylan® 4148

Dynasylan® 4148 by Evonik is polythylene glycol-functional alkoxysilane. It helps to control rheological properties and to reduce viscosity in highly-filled polymer systems, like aluminum trihydroxide filled polyesters or SMC pastes. Contrary to most other organofunctional silanes, it features chemi...

Dynasylan® SIVO 210

Dynasylan® SIVO 210 by Evonik is aminofunctional silane. Acts as an adhesion promoter and a surface modifier. Provides improvement in mechanical properties, for example flexural strength, tensile strength, impact strength and modulus of elasticity as well as moisture and corrosion resistance. Offers...

Dynasylan® TRIAMO

Dynasylan® TRIAMO by Evonik is triamino-functional propyltrimethoxysilane. Acts as an adhesion promoter and surface modifier. Is an organofunctional silane possessing three reactive amino groups and a hydrolyzable trimethoxysilyl group. Provides advantages such as improved adhesion, moisture and cor...

Dynasylan® HYDROSIL 1151

Dynasylan® HYDROSIL 1151 by Evonik is a VOC-free, aqueous 3-aminopropylsilane hydrolysate compound. Acts as an adhesion promoter. Provides improved mechanical properties, such as flexural strength, tensile strength, impact strength and modulus of elasticity. Can also improve processing properties su...

Dynasylan® VTMOEO

Dynasylan® VTMOEO by Evonik is a vinyltris(2-methoxyethoxy)silane compound. Acts as an efficient adhesion promoter and/or surface modifier. It is a bifunctional organosilane possessing a reactive vinyl group and a hydrolyzable 2-methoxyethoxysilyl group. The dual nature of its reactivity allows this...

Dynasylan® 6598

Dynasylan® 6598 by Evonik is a reactive vinyl-alkyl siloxane oligomer. Used in adhesives and sealants. Acts as an adhesion promoter. Provides improved filler dispersion, increased hydrophobicity, good balance between tensile strength and elongation at break at a high level and improved heat resistan...

Dynasylan® HYDROSIL 2926

Dynasylan® HYDROSIL 2926 by Evonik is an organofunctional siloxane oligomer. Acts as an adhesion promoter. Is an organosilicon compound (epoxyfunctional oligomeric siloxane) based on water as the solvent and contains no volatile organic constituents. Depending on the area of application a concentrat...

Dynasylan® MTMS

Dynasylan® MTMS by Evonik is a methyltrimethoxysilane grade. Acts as a crosslinker. It is a colorless, low-viscosity liquid. It is regarded as trifunctional since all three alkoxy groups are able to hydrolyze. Additionally, it contains a methyl group that adds organic character to the products. Hydr...

Dynasylan® A

Dynasylan® A by Evonik is a low viscosity tetraethylorthosilicate. Used as a crosslinker in silicone rubber systems and as drying agent in sealing compositions. Provides improved chemical and thermal stability. Silicic acid in usually obtained by hydrolysis, or thermally by condensation at elevated ...

Dynasylan® 40

Dynasylan® 40 by Evonik is an ethyl polysilicate grade. Acts as an adhesion promoter. It is a low viscosity liquid with silicon dioxide content of 40%. It is formed in the presence of water from tetraethyl silicate by partial hydrolysis of the ethoxy groups to hydroxyl groups and subsequent condensa...

Dynasylan® M

Dynasylan® M by Evonik is methyl ester of orthosilicic acid. It acts as a crosslinker. It easily hydrolyses upon addition of water. It is the starting material for sol-gel processes, where the additional use of alkylalkoxysilanes can give the siloxane network organic character as a result of incorpo...

Dynasylan® P

Dynasylan® P by Evonik is a special silicic acid ester. It acts as a crosslinker in the silicone industry. It can also be used as precursor for inorganic binders and as basic ingredient for sol-gel formations. Dynasylan® P is used in RTV-1 Alcoxy Silicone Sealants.

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