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МЕТИЛМЕТАКРИЛАТ
- английское имяMethyl methacrylate
- CAS №80-62-6
- CBNumberCB8854425
- ФормулаC5H8O2
- мольный вес100.12
- EINECS201-297-1
- номер MDLMFCD00008587
- файл Mol80-62-6.mol
Температура плавления | -48 °C (lit.) |
Температура кипения | 100 °C (lit.) |
плотность | 0.936 g/mL at 25 °C (lit.) |
плотность пара | 3.5 (vs air) |
давление пара | 29 mm Hg ( 20 °C) |
FEMA | 4002 | METHYL 2-METHYL-2-PROPENOATE |
показатель преломления | n |
Fp | 50 °F |
температура хранения | 2-8°C |
растворимость | 15g/l |
форма | Crystalline Powder or Crystals |
цвет | White to pale yellow |
Запах | at 0.10 % in dipropylene glycol. acrylic aromatic fruity |
Odor Type | acrylate |
Вязкость | 0.564mm2/s |
Пределы взрываемости | 2.1-12.5%(V) |
Порог?обнаружения?запаха? | 0.21ppm |
Растворимость в воде | 15.9 g/L (20 ºC) |
Мерк | 14,5941 |
Номер JECFA | 1834 |
БРН | 605459 |
констант закона Генри | 2.46 x 10-4 atm?m3/mol at 20 °C (approximate - calculated from water solubility and vapor pressure) |
Пределы воздействия | NIOSH REL: TWA 100 ppm (410 mg/m3), IDLH 1,000 ppm; OSHA PEL: TWA 100 ppm; ACGIH TLV: TWA 100 ppm with intended TWA and STEL values of 50 and 100 ppm, respectively. |
Диэлектрическая постоянная | 2.9(20℃) |
Стабильность | Volatile |
ИнЧИКей | VVQNEPGJFQJSBK-UHFFFAOYSA-N |
LogP | 1.38 at 20℃ |
Непрямые добавки, используемые в веществах, контактирующих с пищевыми продуктами | METHYL METHACRYLATE |
Вещества, добавляемые в пищу (ранее EAFUS) | METHYL METHACRYLATE |
FDA 21 CFR | 175.105; 175.300; 175.320; 177.1010; 178.3790 |
Справочник по базе данных CAS | 80-62-6(CAS DataBase Reference) |
Рейтинг продуктов питания EWG | 5-9 |
FDA UNII | 196OC77688 |
МАИР | 3 (Vol. Sup 7, 60) 1994 |
Справочник по химии NIST | 2-Propenoic acid, 2-methyl-, methyl ester(80-62-6) |
Система регистрации веществ EPA | Methyl methacrylate (80-62-6) |
Коды опасности | F,Xi,T | |||||||||
Заявления о рисках | 11-37/38-43-39/23/24/25-23/24/25 | |||||||||
Заявления о безопасности | 24-37-46-45-36/37-16-7 | |||||||||
РИДАДР | UN 1247 3/PG 2 | |||||||||
OEB | A | |||||||||
OEL | TWA: 100 ppm (410 mg/m3) | |||||||||
WGK Германия | 1 | |||||||||
RTECS | OZ5075000 | |||||||||
Температура самовоспламенения | 815 °F | |||||||||
TSCA | Yes | |||||||||
Класс опасности | 3 | |||||||||
Группа упаковки | II | |||||||||
кода HS | 29161410 | |||||||||
Банк данных об опасных веществах | 80-62-6(Hazardous Substances Data) | |||||||||
Токсичность | The acute toxicity of methyl methacrylate is low. Irritation of the skin, eye, and nasal cavity has been observed in rodents and rabbits exposed to relatively high concentrations of methyl methacrylate. The chemical is a mild skin sensitizer in animals. The effect observed most frequently at lowest concentration after repeated inhalation exposure to methyl methacrylate is irritation of the nasal cavity. Effects on the kidney and liver at higher concentrations have also been reported. | |||||||||
ИДЛА | 1,000 ppm | |||||||||
NFPA 704: |
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рисовальное письмо(GHS)
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рисовальное письмо(GHS)
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сигнальный язык
опасность
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вредная бумага
H315:При попадании на кожу вызывает раздражение.
H335:Может вызывать раздражение верхних дыхательных путей.
H317:При контакте с кожей может вызывать аллергическую реакцию.
H225:Легковоспламеняющаяся жидкость. Пары образуют с воздухом взрывоопасные смеси.
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оператор предупредительных мер
P210:Беречь от тепла, горячих поверхностей, искр, открытого огня и других источников воспламенения. Не курить.
P233:Держать в плотно закрытой/герметичной таре.
P240:Заземлить и электрически соединить контейнер и приемное оборудование.
P241:Использовать взрывобезопасное оборудование и освещение.
P280:Использовать перчатки/ средства защиты глаз/ лица.
P303+P361+P353:ПРИ ПОПАДАНИИ НА КОЖУ (или волосы): Снять/удалить немедленно всю загрязненную одежду. Промыть кожу водой.
МЕТИЛМЕТАКРИЛАТ химические свойства, назначение, производство
Описание
Methyl methacrylate is an organic compound with the formula CH2=C(CH3)COOCH3. This colourless liquid, the methyl ester of methacrylic acid (MAA) is a monomer produced on a large scale for the production of poly(methyl methacrylate) (PMMA).Химические свойства
Methyl methacrylate is a methyl ester of methacrylic acid. It is a colourless, volatile liquid with an acrid fruity odour. It has a relatively high vapour pressure (4 kPa at 20°C), moderate water solubility (15.8 g/litre), and a low log octanol/water partition coefficient (Kow = 1.38) . Methyl methacrylate is typically 99.9% pure and contains small amounts of inhibitor to retard polymerization.Физические свойства
Clear, colorless liquid with a penetrating, fruity odor. An experimentally determined odor threshold concentration of 210 ppbv was reported by Leonardos et al. (1969). Experimentally determined detection and recognition odor threshold concentrations were 200 μg/m3 (49 ppbv) and 1.4 mg/m3 (340 ppbv), respectively (Hellman and Small, 1974).Использование
The principal application, consuming approximately 80% of the MMA, is the manufacture of poly methyl methacrylate acrylic plastics (PMMA). Methyl methacrylate is also used for the production of the co-polymer methyl methacrylate-butadiene-styrene (MBS), used as a modifier for PVC. Another application is as cement used in total hip replacements as well as total knee replacements. Used as the "grout" by orthopedic surgeons to make the bone inserts fix into bone, it greatly reduces post-operative pain from the insertions but has a finite lifespan. Typically the lifespan of methyl methacrylate as bone cement is 20 years before revision surgery is required. Cemented implants are usually only done in elderly populations that require more immediate short term replacements. In younger populations, cementless implants are used because their lifespan is considerably longer. Also used in fracture repair in small exotic animal species using internal fixation.Методы производства
The compound is manufactured by several methods, the principal one being the acetone cyanohydrin (ACH) route, using acetone and hydrogen cyanide as raw materials. The intermediate cyanohydrin is converted with sulfuric acid to a sulfate ester of the methacrylamide, methanolysis of which gives ammonium bisulfate and MMA. Although widely used, the ACH route coproduces substantial amounts of ammonium sulfate. Some producers start with an isobutylene or, equivalently, tert-butanol, which is sequentially oxidized first to methacrolein and then to methacrylic acid, which is then esterified with methanol. Propene can be carbonylated in the presence of acids to iso butyric acid, which undergoes subsequent dehydrogenation . The combined technologies afford more than 3 billion kilograms per year. MMA can also be prepared from methyl propionate and formaldehyde.Подготовка
Prepared by the esterification of methacrylamide sulfate with methanol.Определение
ChEBI: Methyl methacrylate is an enoate ester having methacrylic acid as the carboxylic acid component and methanol as the alcohol component. It has a role as an allergen and a polymerisation monomer. It is an enoate ester and a methyl ester. It is functionally related to a methacrylic acid.Общее описание
A clear colorless liquid. Slightly soluble in water and floats on water. Vapors heavier than air. Vapors irritate the eyes and respiratory system. Containers must be heavily insulated or shipped under refrigeration. An inhibitor such as hydroquinone, hydroquinone methyl ester and dimethyl t-butylphenol is added to keep the chemical from initiating polymerization. The chemical may polymerize exothermically if heated or contaminated with strong acid or base. If the polymerization takes place inside a container, the container may rupture violently. Used to make plastics.Реакции воздуха и воды
Highly flammable. Very slightly soluble in water.Профиль реактивности
Methyl methacrylate, may polymerize if contaminated or subjected to heat. If polymerization takes place in a container, the container is subject to violent rupture. Oxidizes readily in air to form unstable peroxides that may explode spontaneously [Bretherick 1979. p.151-154, 164]. Peroxides may also initiate exothermic polymierization of the bulk material [Bretherick 1979. p. 160]. Benzoyl peroxide was weighed into a beaker that had previously been rinsed with methyl methacrylate. The peroxide catalyzed polymerization of the methyl methacrylate and the build-up of heat ignited the remaining peroxide [MCA Case History 996. 1964].Опасность
Flammable, dangerous fire risk, explosivelimits in air 2.1–12.5%. Eye and upper respiratorytract irritant, body weight effects, and pulmonaryedema. Questionable carcinogen.Угроза здоровью
- Methyl methacrylate may cause slight eye irritation or moderate skin irritation. It is considered a skin sensitizer; allergic reactions may result from contact. Inhalation of vapor or mist can cause irritation of the nose, throat, and lungs and can be fatal in high concentrations. Prolonged or repeated overexposure has been reported to affect the kidneys, liver, gastrointestinal tract, nervous system and lung.
- Methyl methacrylate is moderately toxic to aquatic organisms on an acute basis. The bioconcentration potential (tendency to accumulate in the food chain) is low. If released to surface water, methyl methacrylate will readily biodegrade. A portion may evaporate to the air. It will not persist in the environment.
- Irritation of eyes, nose, and throat. Nausea and vomiting. Liquid may cause skin irritation.
Пожароопасность
Behavior in Fire: Vapor is heavier than air and may travel a considerable distance to a source of ignition and flash back. Containers may explode in fire or when heated because of polymerization.Промышленное использование
Initiators for methyl methacrylate polymerization include AIBN, dilauroyl peroxide (LPO), and 2,2'-Azobis[2-(2-imidazolin-2- yl)propane].Профиль безопасности
Moderately toxic by inhalation and intraperitoneal routes. Mildly toxic by ingestion. Human systemic effects by inhalation: sleep effects, excitement, anorexia, and blood pressure decrease. Experimental teratogenic and reproductive effects. Mutation data reported. A skin and eye irritant. Questionable carcinogen with experimental tumorigenic data. A common air contaminant. A very dangerous fire hazard when exposed to heat or flame; can react with oxidizing materials. Explosive in the form of vapor when exposed to heat or flame. The monomer may undergo spontaneous, explosive polymerization. Reacts in air to form a heat-sensitive explosive product (explodes on evaporation at 6OOC). May ignite on contact with benzoyl peroxide. Potentially violent reaction with the polymerization initiators azoisobutyronitrile, dibenzoyl peroxide, di-tert-butyl peroxide, propionaldehyde. To fight fire, use foam, CO2, dry chemical. When heated to decomposition it emits acrid smoke and irritating fumes.Возможный контакт
Virtually all of the methyl methacrylate monomer produced is used in the production of polymers, such as surface coating resins; plastics (Plexiglas and Lucite); ion exchange resins; and plastic dentures.Канцерогенность
In several lifetime animal studies, there was no evidence that methyl methacrylate is carcinogenic.Экологическая судьба
Chemical/Physical. Polymerizes easily (Windholz et al., 1983). Methyl methacrylate undergoes nucleophilic attack by OH ions in water (hydrolysis) resulting in the formation of methacrylic acid and methanol (Kollig, 1993). Hydrolysis occurs at a rate of 171/M?h at 25 °C (Sharma and Sharma, 1970). No measurable hydrolysis was observed at 85.0 °C (pH 7) and 25 °C (pH 7.07). Hydrolysis half-lives of 9 and 134 min were observed at 66.0 °C (pH 9.86) and 25.0 °C (pH 11.3), respectively (Ellington et al., 1987).хранилище
Methyl methacrylate is a reactive chemical that must be stored and handled with care. It is stable under recommended storage conditions. Heat can cause polymerization. Inhibitor is added to methyl methacrylate monomer to prevent polymerization. For the inhibitor to be effective, the oxygen concentration in the vapor space must be at least 5%. Store material in containers made of stainless steel, carbon steel, glass, or aluminum. Avoid contact with acids, bases, oxidizing agents, reducing agents, UV light (ultraviolet light, which is found in sunlight), free-radical initiators, and organic peroxides.Перевозки
UN1247 Methyl methacrylate monomer, stabilized, Hazard Class: 3; Labels: 3-Flammable liquid.Методы очистки
Wash the ester twice with aqueous 5% NaOH (to remove inhibitors such as hydroquinone) and twice with water. Dry it with CaCl2, Na2CO3, Na2SO4 or MgSO4, then with CaH2 under nitrogen under reduced pressure. The distillate is stored at low temperatures and redistilled before use. Prior to distilling, inhibitors such as hydroquinone (0,004%), .-naphthylamine (0.2%) or di--naphthol are sometimes added. Also purify it by boiling with aqueous H3PO4 solution and finally with saturated NaCl solution. It is dried for 24hours over anhydrous CaSO4, distilled at 0.1mm Hg at room temperature and stored at -30o [Albeck et al. J Chem Soc, Faraday Trans 1 1 1488 1978]. [Beilstein 2 II 398, 2 III 1279, 2 IV 1519.]Несовместимости
Vapor may form explosive mixture with air. Reacts in air to form a heat-sensitive explosive product @ 60C. Incompatible with nitrates, oxidizers, peroxides, strong acids; strong alkalis; oxidizers, reducing agents; amines, moisture. Contact with benzoyl peroxide may cause ignition, fire and explosion. May polymerize if subjected to heat, polymerization catalysts e. g., azoisobutyronitrile, dibenzoyl peroxide; di-tert-butyl peroxide, propionaldehyde); strong oxidizers; or ultraviolet light. May contain an inhibitor, such as hydroquinone.Утилизация отходов
Consult with environmental regulatory agencies for guidance on acceptable disposal practices. Generators of waste containing this contaminant (≥100 kg/mo) must conform to EPA regulations governing storage, transportation, treatment, and waste disposal. Incineration may be allowed.МЕТИЛМЕТАКРИЛАТ запасные части и сырье
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