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The material selection platform
Adhesives Ingredients
The material selection platform
Adhesives Ingredients

Siliconized Acrylic Waterborne Sealant

Adhesives Formulation

Applicable Base Polymer Properties

Acrylic emulsion based sealants have taken over many of the applications where a higher movement capability is required than for polyvinyl acetate sealants. Acrylic sealants can also be used outdoors, whereas the polyvinyl acetate sealants have inferior exterior durability.
Acrylic emulsion polymers are ideally suited to the formulation of medium performance sealants. There is a significant variation in the types of base polymer emulsions that are available, and these emulsions are easy to formulate. This gives the formulator a wide latitude for compounding to meet specific requirements. Sealants based on acrylic emulsions provide tough, elastic systems, with high adhesion and durability, and they are very environmentally friendly and easy to use.

Typical Formulation Ingredients

Ingredient
Parts by weight
Acrylic emulsion (62.5% solids) 
xxxxxx 
Propylene glycol 
xxxxx 
Non-ionic surfactant 
xxxxx 
Inorganic dispersants 
xxxx 
Organic anionic dispersants 
xxxx 
Titanium dioxide pigment 
xxxxx 
Calcium carbonate 
xxxxxx 
Precipitated silica 
xxxx 
Plasticizer 
xxxxxx 
Organosilane 
xxxx 
Mineral spirits 
xxxxx 
Preservatives 
xxxx 
Anionic thickener 
xxxx 
Ammonium hydroxide (14%) 
xxxx 

Processing

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Resulting Properties

Organosilanes will provide improvement in both dry and wet adhesion properties of the acrylic sealant. These are used in very small quantities: 0.5 to 0.1% of the total formulation. These water based formulations are sometimes referred to as silconized sealants even though they are far different than the high performance silicone sealants.
Organosilanes form a chemical bridge between the base polymer in the sealant and the substrate. Organosilanes are most efficient on metal, glass, ceramic and other high energy substrates. They provide little if any advantage on low energy substrates.
Siliconized acrylic systems are conventionally found in hardware stores for the consumer markets. The table above provides a formulation for a high quality “siliconized” acrylic sealant.

Tips and Tricks

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