Methacrylic acid
- Product Name
- Methacrylic acid
- CAS No.
- 79-41-4
- Chemical Name
- Methacrylic acid
- Synonyms
- 2-Methyl-2-propenoic acid;Metacrilic Acid;.alpha.-Methylacrylicacid;2-METHACRYLIC ACID;2-methyl-2-Propenoicacid;2-methylene-propionicaci;Methacrylic acid,99.5%,extra pure,stabilized;GE110;FX668F;ai3-15724
- CBNumber
- CB9240023
- Molecular Formula
- C4H6O2
- Formula Weight
- 86.09
- MOL File
- 79-41-4.mol
Methacrylic acid Property
- Melting point:
- 12-16 °C (lit.)
- Boiling point:
- 163 °C (lit.)
- Density
- 1.015 g/mL at 25 °C (lit.)
- vapor density
- >3 (vs air)
- vapor pressure
- 1 mm Hg ( 20 °C)
- refractive index
- n20/D 1.431(lit.)
- Flash point:
- 170 °F
- storage temp.
- Store at +15°C to +25°C.
- solubility
- Chloroform, Methanol (Slightly)
- form
- Liquid
- pka
- pK1:4.66 (25°C)
- color
- Clear
- PH
- 2.0-2.2 (100g/l, H2O, 20℃)
- Odor
- Repulsive
- explosive limit
- 1.6-8.7%(V)
- Water Solubility
- 9.7 g/100 mL (20 ºC)
- Sensitive
- Moisture & Light Sensitive
- Merck
- 14,5941
- BRN
- 1719937
- Exposure limits
- TLV-TWA 20 ppm (～70 mg/m3) (ACGIH).
- Stability:
- May be stabilized by the addition of MEHQ (Hydroquinone methyl ether, ca. 250 ppm) or hydroquinone. In the absence of a stabilizer this material will readily polymerize. Combustible. Incompatible with strong oxidizing agents, hydrochloric acid.
- InChIKey
- CERQOIWHTDAKMF-UHFFFAOYSA-N
- LogP
- 0.93 at 22℃
- CAS DataBase Reference
- 79-41-4(CAS DataBase Reference)
- NIST Chemistry Reference
- 2-Propenoic acid, 2-methyl-(79-41-4)
- EPA Substance Registry System
- Methacrylic acid (79-41-4)
Safety
- Hazard Codes
- C
- Risk Statements
- 21/22-35-37-20/21/22
- Safety Statements
- 26-36/37/39-45
- RIDADR
- UN 2531 8/PG 2
- OEB
- A
- OEL
- TWA: 20 ppm (70 mg/m3) [skin]
- WGK Germany
- 1
- RTECS
- OZ2975000
- Autoignition Temperature
- 752 °F
- TSCA
- Yes
- HS Code
- 2916 13 00
- HazardClass
- 8
- PackingGroup
- II
- Hazardous Substances Data
- 79-41-4(Hazardous Substances Data)
- Toxicity
- LD50 orally in Rabbit: 1320 mg/kg
Hazard and Precautionary Statements (GHS)
- Symbol(GHS)
-
- Signal word
- Danger
- Hazard statements
-
H311Toxic in contact with skin
H314Causes severe skin burns and eye damage
H335May cause respiratory irritation
- Precautionary statements
-
P261Avoid breathing dust/fume/gas/mist/vapours/spray.
P280Wear protective gloves/protective clothing/eye protection/face protection.
P301+P312IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.
P303+P361+P353IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.
P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
N-Bromosuccinimide Price
- Product number
- 8.00578
- Product name
- Methacrylic acid
- Purity
- (stabilised with hydroquinone monomethyl ether) for synthesis
- Packaging
- 100mL
- Price
- $41.6
- Updated
- 2024/03/01
- Product number
- 8.00578
- Product name
- Methacrylic acid
- Purity
- (stabilised with hydroquinone monomethyl ether) for synthesis
- Packaging
- 500mL
- Price
- $54.6
- Updated
- 2024/03/01
- Product number
- 8.00578
- Product name
- Methacrylic acid
- Purity
- (stabilised with hydroquinone monomethyl ether) for synthesis
- Packaging
- 2.5L
- Price
- $120
- Updated
- 2024/03/01
- Product number
- 155721
- Product name
- Methacrylic acid
- Purity
- contains 250 ppm MEHQ as inhibitor, 99%
- Packaging
- 2kg
- Price
- $165
- Updated
- 2024/03/01
- Product number
- 155721
- Product name
- Methacrylic acid
- Purity
- contains 250 ppm MEHQ as inhibitor, 99%
- Packaging
- 3kg
- Price
- $202
- Updated
- 2024/03/01
Methacrylic acid Chemical Properties,Usage,Production
Description
Methacrylic acid, abbreviated MAA, is an organic compound. This colourless, viscous liquid is a carboxylic acid with an acrid unpleasant odor. It is soluble in warm water and miscible with most organic solvents. Methacrylic acid is produced industrially on a large scale as a precursor to its esters, especially methyl methacrylate (MMA) and poly(methyl methacrylate) (PMMA). The methacrylates have numerous uses, most notably in the manufacture of polymers with trade names such as Lucite and Plexiglas. MAA occurs naturally in small amounts in the oil of Roman chamomile.
Chemical Properties
Methacrylic acid is is a colorless, moderately volatile, corrosive liquid with a strongly acrid odor. It was first prepared in 1865 from ethyl methacrylate, in turn obtained by dehydration of ethyl α-hydroxyisobutyrate.
Uses
Methacrylic acid is used in the manufacture of methacrylate resins and plastics. It is used as Monomer for large-volume resins and polymers, organic synthesis. Many of the polymers are based on esters of the acid, as the methyl, butyl, or isobutyl esters. Methacrylic acid and methacrylate esters are used to prepare a wide range of polymers [→ Polyacrylamides and Poly(Acrylic Acids), → Polymethacrylates]. Poly(methyl methacrylate) is the primary polymer in this category, and it provides water-clear, tough plastics that are used in sheet form in glazing, signs, displays, and lighting panels.
Preparation
The most common route for the preparation of methacrylic acid is from
acetone as follows:
In a typical process, acetone is treated with hydrogen cyanide at 140??C in the presence of ammonia as catalyst. The acetone cyanohydrin produced is treated with concentrated sulphuric acid at 100??C to form methacrylamide sulphate. This intermediate is not isolated but is directly converted to methacrylic acid by treatment with water at about 90??C.
A competitive route now in commercial operation involves the two stage oxidation of isobutene with air. The reaction proceeds via methacrolein:
Definition
ChEBI: Methacrylic acid is an alpha,beta-unsaturated monocarboxylic acid that is acrylic acid in which the hydrogen at position 2 is substituted by a methyl group. It is functionally related to an acrylic acid. It is a conjugate acid of a methacrylate.
Production Methods
The most common approach to methacrylic acid synthesis is the hydrolysis of methacrylamide sulfate, obtained from acetone cyanohydrin. Methyl methacrylate may be prepared directly in a similar way by adding methanol in the final reaction step.
In the manufacture of methacrylic acid, methacrylamide sulfate is reacted with water under conditions similar to those used for formation of the ester. The reactor effluent separates into two phases. The upper organic layer is distilled to provide pure methacrylic acid. The lower layer is steam stripped to recover dilute aqueous methacrylic acid, which is recycled to the hydrolysis reactor. The waste acid stream is treated as in the manufacture of the ester.
General Description
Methacrylic acid appears as a clear colorless liquid (or low-melting solid) with a pungent odor. Corrosive to metals and tissue. Flash point 170°F. Melting point 61°F. May polymerize exothermically if heated or contaminated. If the polymerization takes place inside a container, the container may rupture violently. Less dense than water. Vapors heavier than air. Used to make plastics.
Air & Water Reactions
Soluble in water.
Reactivity Profile
Methacrylic acid reacts with strong oxidizing agents. Presents a storage hazard: violent exothermic polymerizations leading to explosion can occur spontaneously, particularly at low inhibitor or stabilizer concentrations [Anon., CISHC Chem. Safety Summ., 1979, 50, p. 34; Bond, J., Loss Prev. Bull., 1991, 101, p. 1].
Health Hazard
Methacrylic acid is a highly corrosive liquid.Contact with eyes can result in blindness.Skin contact may produce burns. No inhalation toxicity was observed in rats. Exposureto its vapors may produce skin and eye irritation, which can be mild to moderate. Adermal LD50 value in rabbits is 500 mg/kg.
Fire Hazard
Combustible liquid; flash point (open cup)
76°C (170°F); vapor pressure <0.1 torr at
20°C (68°F). Fire-extinguishing agent: water
spray, “alcohol” foam, dry chemical, or CO2;
use a water spray to dilute and flush the spill
and to disperse the vapors.
Methacrylic acid polymerizes readily. The
reaction is exothermic. The rate of reaction
accelerates on heating, which may result
in violent rupture of closed containers. The
polymerization may be inhibited with a trace
quantity of hydroquinone and hydroquinone
monomethyl ether (Aldrich 2006). The acid
may be stored safely below its melting point.
Safety Profile
Poison by intraperitoneal route. Moderately toxic by ingestion and skin contact. Corrosive to skin, eyes, and mucous membranes. Mutation data reported. Flammable when exposed to heat, flame, or oxidizers. A storage hazard; exothermic polymerization may occur spontaneously. To fight fire, use alcohol foam, spray, mist, dry chemical. When heated to decomposition it emits acrid smoke and irritating fumes.
Potential Exposure
Methacrylic acid is used in preparation of methacrylates and carboxylated polymers; in the production of the material or its alkyl esters, as monomers or comonomers for synthetic resins for the production of plastic sheets, moldings, and fibers.
First aid
If this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 min, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately. If this chemical has been inhaled, remove from exposure, begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR if heart action has stopped. Transfer promptly to a medical facility. When this chemical has been swallowed, get medical attention. If victim is conscious, administer water or milk. Do not induce vomiting. Medical observation is recommended for 2448 h after breathing overexposure, as pulmonary edema may be delayed. As first aid for pulmonary edema, a doctor or authorized paramedic may consider administering a corticosteroid spray.
Carcinogenicity
Methacrylic acid was considered by the IARC Working Groups, but monographs were not prepared because adequate data on its carcinogenicity were not available. The IUCLID database reports a dermal application study (dose unspecified) of mice treated three times per week for 4 months and then observed for their lifetimes. No excess dermal tumors were observed.
storage
(1) Color Code—White: Corrosive or Contact Hazard; Store separately in a corrosion-resistant location. (2) Color Code—Blue: Health Hazard/Poison: Store in a secure poison location. (3) Color Code—Yellow Stripe (strong reducing agent): Reactivity Hazard; Store separately in a area isolated from flammables, combustibles, or other yellow coded materials. Prior to working with this chemical you should be trained on its proper handling and storage. Before entering confined space where this chemical may be present, check to make sure that an explosive concentration does not exist. Store in tightly closed containers in a cool, well-ventilated area away from oxidizers (such as perchlorates, peroxides, permanganates, chlorates, and nitrates). Methacrylic acid should be stored at temperatures below 15℃. Sources of ignition, such as smoking and open flames are prohibited where methacrylic acid is handled, used, or stored. Wherever methacrylic acid is used, handled, manufactured, or stored, use explosion-proof electrical equipment and fittings.
Shipping
UN2531 Methacrylic acid, stabilized, Hazard class: 8; Labels: 8-Corrosive material.
Purification Methods
Aqueous methacrylic acid (90%) is saturated with NaCl (to remove the bulk of the water), then the organic phase is dried with CaCl2 and distilled under vacuum. Polymerisation inhibitors should be added to the distillate and include 0.25% p-methoxyphenol, 0.1% hydroquinone, or 0.05% N,N'-diphenyl-p-phenylenediamine. [Beilstein 2 IV 1518.]
Incompatibilities
Vapor may form explosive mixture with air. A reducing agent; incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Aqueous solution is strongly acidic: incompatible with strong acids; caustics, ammonia, amines, isocyanates, alkylene oxides; epichlorohydrin. Will polymerize readily from heating above 59F/15C, or due to the presence of light, oxidizers (e.g., peroxides); or in the presence of traces of hydrochloric acid, with fire or explosion hazard. Attacks metals. Note: Typically contains 100 ppm of monomethyl ether hydroquinone (150-76-5) as an inhibitor to prevent polymerization
Toxics Screening Level
The current ITSL for methacrylic acid (30 μg/m3) has a justification (attached) dated September 13, 2007.
Waste Disposal
Dissolve or mix the material with a combustible solvent and burn in a chemical incinerator equipped with an afterburner and scrubber. All federal, state, and local environmental regulations must be observed.
Methacrylic acid Preparation Products And Raw materials
Raw materials
Preparation Products
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View Lastest Price from Methacrylic acid manufacturers
- Product
- Methacrylic acid 79-41-4
- Price
- US $0.00/KG
- Min. Order
- 1KG
- Purity
- 99%
- Supply Ability
- 50000KG/month
- Release date
- 2023-06-28
- Product
- Methacrylic acid 79-41-4
- Price
- US $0.00/kg
- Min. Order
- 20kg
- Purity
- 99.0%
- Supply Ability
- 20 tons
- Release date
- 2024-07-02
- Product
- Methacrylic Acid 79-41-4
- Price
- US $10.00/kg
- Min. Order
- 1kg
- Purity
- 99.5%
- Supply Ability
- 100 TON
- Release date
- 2024-10-31