acrylic
Acrylic (rarely acrylic ) is a collective name for substances that are chemically characterized by the acrylic group (CH 2 = CH – COR) (such as acrylic acid or acrylic acid ester ) and for polymers of these substances. The term was derived from the Latin acer “sharp” or the Greek ἄκρος ákros “highest; Top “derived because of the pungent odor of acrylic acid.
Polymers of acrylic acid esters, commonly referred to as polyacrylates , are used u. a. as a binder for colorants and paints , injection molding compounds, adhesives and as a material in the dental sector.
Because of their physical properties (quick hardening), dispersions of acrylic polymers with pigments and water are used as acrylic paints .
Unsaturated acrylates are main components in radiation-curing colorants, paints and adhesives ( radiation curing ). Chemical crosslinking, polymerization , takes place via the acrylic acid group. This type of colorant is mainly used in industry.
Acrylic paints for home improvement contain saturated polyacrylates that are either dissolved in organic solvents or (more environmentally friendly) as a dispersion in water.
Use as a material in the construction sector
Acrylic is used inter alia in the form of acrylic sealants, the filling and sealing of construction joints or cracks is ( joint sealing ). In contrast to silicone , acrylic is odorless and can be painted over later. A structure in several layers is also possible. However, acrylic has less adhesion and elasticity than silicone and is only partially water-repellent, so that it is recommended to use silicone for grouting in wet areas .
See also
- Acrylic resin
- Acrylic paint
- Polymethyl methacrylate (acrylic glass, plexiglass)
- Acrylamide
- Polyacrylonitrile - basic material for acrylic clothing fibers