The Universal Selection Source: Adhesives Ingredients

Formulation

2K Polybutadiene Polyol Based Insulating Glass Sealant

Applicable Type
Applicable Base Polymer
Applicable Industrial Sectors

Typical Formulation Ingredients

Phase
Ingredient
Parts by weight
Polybutadiene resin (Poly bd R45HTLO, Cray Valley) 
   
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    Chain extender (2-ethyl-1,3-hexanediol) 
       
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    Filler calcium carbonate (Super-Pflex 200, Specialty Minerals) 
       
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    Filler calcium carbonate (Ultra-Pflex, Minerals Technology Inc.) 
       
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    Carbon black (Sterling R, Cabot Corporation) 
       
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    Plasticizer (Santicizer 278, Valtris) 
       
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    Fumed silica (Cab-O-Sil TS-720, Cabot Corporation) 
       
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    Antioxidant (Vanox NBC, R.T. Vanderbilt) 
       
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    Silane (Silquest A-187, Momentive) 
       
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    Dibutyltin dilaurate 
       
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    Polyfunctional MDI liquid (Isonate 143L, Dow Chemical Co.) (NCO/OH = 0.95) 
       
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    Polyfunctional MDI liquid (Isonate 143L, Dow Chemical Co.) (NCO/OH = 0.926) 
       
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    Typical Properties

    Properties
    Good adhesion to metals and glass 
       
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    Low temperature flexibility 
       
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    Water resistance 
       
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    Property retention with age 
       
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    Good filler dispersion 
       
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  • Applicable Base Polymer Properties

    Polyurethanes are extensively and successfully used as adhesives and sealants, and they have an excellent record of durability. Polyurethane-based adhesives form tough bonds with high peel strength. They have better low temperature strength than other adhesives. They have exceptionally high strength at cryogenic temperatures. They have good chemical resistance, although not generally as good as epoxies or acrylics. Urethanes do not have high temperature resistance. Maximum upper use limits are about 150°C, and most formulations are used below 100°C.

    Resulting Properties

    The formulation above is for a general purpose two component polyurethane adhesive based on polybutadiene polyol. Using polybutadiene polyol will provide much better hydrolytic stability than other conventional polyols (e.g., polyester or polyether). Often additives are not required to provide flexibility or toughness as in the case of epoxy formulations. Polyurethanes have the capability of providing these properties through manipulation of the resulting molecule by proper choice of isocyanate and polyol. However, additives are used mainly to stabilize the adhesive relative to moisture, oxidation, UV, etc.

    Source: Yoo, T. and Chao, H., “Hydroxyl-Terminated Polybutadiene Liquid Resins for Adhesives Applications”, Adhesivesmag.com, January 6, 2017.

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