Silquest™ A-171

1 of 96 products in this brand
Silquest™ A-171 silane offers vinyl and silane functionality and also can be utilized for chain extension of RTV silicones or OH functional polymers. This results in Si-O-Si crosslink sites that are highly resistant to the effects of exposure to moisture, chemicals and UV rays. As a siloxane crosslinker, Silquest™ A-171 silane typically does not generate color and is resistant to acid rain under most conditions. This silane is also useful as a moisture scavenger in moisture cure systems where improved shelf life is desired.

Functions: Adhesion Promoter, Crosslinking Agent, Moisture Scavenger

Chemical Family: Silanes

Labeling Claims: Allergen-free, Clean Label, Gluten-free, Grain-free, Natural, Non-GMO

Compatible Polymers & Resins: Acrylics

Molecular Weight: 148.2 - 148.2 g/mol

Features: Chemical Resistance, Consistent Taste, Free of Major Allergens, Improved Clarity, Improved Freeze/Thaw Stability, Improved Texture, Improved viscosity, Low Gelatinized Temperature

Technical Data Sheet

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Identification & Functionality

Chemical Family

Features & Benefits

CASE Ingredients Features
Product Highlights
  • Vinyl Functionality :
    • Vinyl functionality allows free radical addition to polymers.
    • Increases the rate of silane hydrolysis.
  • Trimethoxy Silane Functionality :
    • Bonds to inorganic substrates to provide excellent wet and dry adhesion.
    • Functions as a closslinker.
    • Useful as a moisture scavenger.

Applications & Uses

Compatible Polymers & Resins
Food & Nutrition Applications
Recommeded Usage

Crosslinking with the Momentive Performance Materials family of vinyl Silquest silanes Silquest A-171 silane are monomeric vinyl functional silanes in vinyl, vinyl acrylic and acrylic resins. The vinyl silanes can be added as monomers during emulsion poly merization to form silane modified latexes. The silanes in such latexes function as crosslinkers, forming very stable Si-O-Si linkages.

Vinyl silanes can also be grafted to select unsaturated polymers such as polyethylene, Silquest A-171 .Silquest is a trademark of Momentive Performance Materials Inc. polyester, and styrene-butadiene co-polymers, via free radical chemistry. Once grafted to the resin, the resin exhibits silane functionality through which the resin can be crosslinked via an ambient moisture cure mechanism. This approach can be utilized to provide improved high temperature resistance, tensile and tear strengths to thermoplastic resin-based materials.

With the addition of an adhesion promoting silane, such as Silquest A-1110 silane or Silquest A-1120 silane, excellent adhesion to a wide array of substrates can be obtained (Note: See literature on SPUR* prepolymer-based technology for additional information on synergistic use of Silquest silane crosslinkers and adhesion promoters for excellent adhesion to difficult substrates). This approach may be suitable to warm applied hot melt adhesive and sealant applications.

Moisture Scavenging with Momentive Performance Materials vinyl functional Silquest silanes.

The electron withdrawing effect imparted by the silanes vinyl functionality enhances the rate of hydrolysis. This increased reactivity makes Silquest A-171 silane one of the fastest hydrolyzing alkoxy silanes available. The elevated rate of hydrolysis is sufficient to enable Silquest A-171 silane to be utilized as a moisture scavenging agent in moisture sensitive systems.

Silquest A-171 silane can be incorporated into urethane, silylated polyurethane (SPUR prepolymer) or other silane modified polymer based sealants and adhesives to extend the systems shelf-life.

 

Properties

Physical Form
Appearance
Colorless to Light Straw
Soluble in
Water
Typical Properties
ValueUnitsTest Method / Conditions
Flash Point28°C
Viscosity (d)3cSt
Flash Point82°F
Flash Point28 (82)°C (°F)Tag Closed Cup

Technical Details & Test Data

Solubility

Momentive Performance Materials family of vinyl Silquest silanes are soluble in water after they have been hydrolyzed. Hydrolyzing Silquest A-171 silane in water is aided by adjusting the pH of the water to 5.0-5.5 with acetic acid prior to adding the silane.