Description
The primary use of acrylic acid is in the production of acrylic esters and resins, which are used primarily in coatings and adhesives. It is also used in oil treatment chemicals, detergent intermediates, water treatment chemicals, and water absorbent polyacrylic acid polymers. Acrylic acid is used widely for polymerization, including production of polyacrylates. It is a monomer for polyacrylic and polymethacrylic acids and other acrylic polymers. It is used in the manufacture of plastics, as a tackifier, as a flocculant, in the production of water-soluble resins and salts, as a comonomer in acrylic emulsion and solution polymers and in molding powder for signs, construction units, decorative emblems and insignias. It is used in polymer solutions for coatings applications, in paint formulations, in leather finishings, in paper coatings, in polishes and adhesives and in general finishes and binders.
Substance details
Substance name: Acrylic acid
CASR number: 79-10-7
Molecular formula: C3H4O2
Synonyms: 2-Propenoic acid, acrylsyre, acide acrylique acido acrilico, acrylzuur, ethylenecarboxylic acid, vinylformic acid, acroleic acid.
Physical properties
Acrylic acid is a corrosive, colourless liquid with an acrid odour.
Boiling Point: 141.0°C
Melting Point: 14.0°C
Flash Point: 68°C (open cup)
Vapour Density: 2.45
Density: 1.0511 at 20°C
Vapour Pressure: 3.1 mm Hg at 20°C
Chemical properties
It is miscible with water, alcohol, ether, benzene, chloroform, and acetone. It polymerizes readily in the presence of oxygen. Exothermic polymerization at room temperature may cause acrylic acid to become explosive if confined. It is sensitive to heat and sunlight. It is normally supplied as the inhibited monomer (inhibited with 200 ppm hydroquinone monomethyl ether), but because of its relatively high freezing point it often partly solidifies and the solid phase (and the vapour) will then be free of the inhibitor which remains in the liquid phase. Even the un-inhibited form may be stored safely below the melting point, but such material will polymerize exothermically at ambient temperature and may accelerate to a violent or explosive state if confined. It is also a fire hazard when exposed to heat or flame. Acrylic acid is incompatible with strong oxidizers, strong bases, strong alkalies and pure nitrogen. It may polymerize (sometimes explosively) on contact with amines, ammonia, oleum and chlorosulfonic acid, iron salts and peroxides. It may corrode iron and steel.
Further information
The National Pollutant Inventory (NPI) holds data for all sources of acrylic acid emissions in Australia.
Description
Symptoms of exposure to this compound include irritation of the skin, eyes and respiratory tract. Corrosion and burns can occur. Eye and lung damage can also occur. Exposure may cause coughing, wheezing, laryngitis, shortness of breath, headache, nausea and vomiting. Inhalation may be fatal as a result of spasm, inflammation and swelling of the larynx and bronchi, chemical pneumonitis and pulmonary oedema (fluid in the lungs). It may cause sensitisation (allergic reaction) and even very small future exposures can cause a rash. Ingestion can lead to pain and burning in the mouth, pharynx and stomach, diarrhoea, fall in blood pressure, asphyxia due to swelling in the throat, and destruction of mucous membranes of the gastrointestinal tract. Skin contact may lead to inflammation, skin rashes and systemic poisoning (if absorbed through the skin).
Acrylic Acid should be handled as a teratogen.
Entering the body
Acrylic acid is absorbed from skin contact, inhalation, or ingestion.
Exposure
Products containing acrylic acid include polishes, paints, coatings, rug backings, adhesives, plastics, textiles, and paper.
Workplace exposure standards
Safe Work Australia sets the workplace exposure standard for acrylic acid through the workplace exposure standards for airborne contaminants:
- Maximum eight hour time weighted average (TWA): 2 parts per million (5.9 mg/m3)
These standards are only appropriate for use in workplaces and are not limited to any specific industry or operation. Make sure you understand how to interpret the standards before you use them.
Drinking water guidelines
There is no guideline for acrylic acid in the Australian Drinking Water Guidelines.
Description
Due to the breakdown of acrylic acid in the environment and its moderate acute toxicity, the chemical would not be expected to be toxic to aquatic or terrestrial animals at levels normally found in the environment. As a volatile organic compound (VOC), acrylic acid can contribute to the formation of photo-chemical smog in the presence of other precursors.
Acute toxic effects may include the death of animals, birds, or fish, and death or low growth rate in plants. Acute (short term) effects are seen two to four days after animals or plants come in contact with a toxic chemical substance. Acrylic acid has slight acute toxicity to aquatic life and high toxicity to birds. Insufficient data are available to evaluate or predict the short-term effects of acrylic acid to plants or land animals. Chronic toxic (long term) effects may include shortened lifespan, reproductive problems, lower fertility, and changes in appearance or behaviour. Chronic effects can be seen long after first exposure(s) to a toxic chemical.
Entering the environment
Because of water solubility and vapour pressure most (about 90%) acrylic acid released to the environment is expected to end up in water. The chemical can be removed from the atmosphere in rain. If released to soil the chemical leaches into groundwater or surface waters. Leaching into ground or surface waters is the major route of removal of acrylic acid from soils due to the chemical's high water solubility and low vapour pressure. Bioaccumulation of acrylic acid is not expected to be significant.
Where it ends up
Acrylic acid exists in the atmosphere in the gas phase. The dominant atmospheric loss process for acrylic acid is by reaction with the hydroxyl radical. Based on this reaction, the atmospheric life is only expected to be a few days. In the air acrylic acid reacts with ozone to produces glyoxylic acid and formic acid. Wet and dry deposition of gaseous acrylic acid may also be important.
Acrylic Acid is biodegradable. It is also destroyed by sunlight in surface soils and water. It is slightly persistent in water but will degrade within a few weeks or months.
Environmental guidelines
No national guidelines.
Industry sources
Acrylic acid may be released in wastewater and as emissions during its production and use. Acrylic acid is emitted from the production of acrylic acid and acrylate. The primary stationary sources listed in the US are manufacturers of guided missiles and space vehicles, and electronic components and accessories.
Diffuse sources, and industry sources included in diffuse emissions data
Acrylic acid emissions can occur from polishes, paints, coatings, rug backings, adhesives, plastics, textiles, and paper finishes. Acrylic acid has been used as a pesticide.
Natural sources
Acrylic acid is also produced naturally by some species of algae and has been found in the rumen fluid of sheep.
Transport sources
None.
Consumer products
Products containing acrylic acid include polishes, paints, coatings, rug backings, adhesives, plastics, textiles, and paper.
Sources used in preparing this information
- Chemfinder by Cambridgesoft (accessed, May 1999)
- Environmental Chemicals Data and Information Network (accessed, May 1999)
- Office Of Pollution Prevention And Toxics U.S. Environmental Protection Agency (accessed, May 1999)
- Technical Advisory Panel (1999), Final Report to the National Environment Protection Council.
- US Environmental Defense Fund Scorecard (accessed, May 1999)
- US EPA Toxic Chemical Factsheets (accessed, May 1999)
- US National Toxicology Program (accessed, May 1999)
- USEPA Integrated risk Information System (accessed, May 1999)
- Safe Work Australia, Workplace exposure standards for airborne contaminants, accessed July 2018.
- National Health and Medical Research Council (NHMRC), Australian Drinking Water Guidelines (2011) - Updated October 2017, accessed May 2018