Methyl methacrylate monomer type

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Methacrylate monomer type
Methacrylate monomer is a type of organic compound containing methacrylate groups. The double bonds and ester groups in its structure endow it with polymerization ability, making it suitable for manufacturing materials such as plastics, coatings, adhesives, etc. The performance of these monomers is affected by the type of substituent, and monomers with different structures have significant differences in hardness, flexibility, and weather resistance. In practical applications, they need to be selected according to the needs.
Common methyl methacrylate monomers include methyl methacrylate, ethyl methacrylate, butyl methacrylate, etc. The molecular formula of methyl methacrylate is C5H8O2, and the ester group is connected to the methyl group. After polymerization, it forms transparent and hard polymethyl methacrylate, commonly known as organic glass, with a light transmittance of over 92%. It is widely used in car lampshades and building lighting panels. The ester group of ethyl ester is replaced with ethyl ester, which increases the molecular weight and improves the flexibility of the polymer, making it suitable for manufacturing plastic products that require bending, such as flexible packaging films. The ester group of butyl ester is butyl, which further increases the molecular chain activity space and makes the polymer softer. It is often added as a plasticizer in coatings to prevent cracking.
Special monomers such as hydroxyethyl methacrylate contain hydroxyl groups and can undergo crosslinking reactions with isocyanates. They are used to prepare two-component polyurethane coatings and are commonly used in automotive repair paints. Methyl methacrylate glycidyl ester carries epoxy groups and participates in curing reactions to form a three-dimensional network structure. Electronic encapsulation adhesives utilize this characteristic to protect circuit boards. Fluorinated methyl methacrylate introduces fluorine atoms, significantly reduces surface energy, and has outstanding waterproof and oil resistant effects. It is applied in textile coating treatment.
More than 60% of methacrylate monomers in the industrial sector are used for coating production. Automotive paint requires high gloss and scratch resistance, using methyl methacrylate and styrene copolymer; Wood paint needs to be cured quickly and combined with benzoyl peroxide initiators; Ship coatings have strict requirements for corrosion resistance and will add anti rust components such as zinc powder. The adhesive industry prefers to use cyanoacrylate quick drying adhesives, but methacrylate structural adhesives have higher peel strength and are suitable for bonding metals and plastics.
Operation of such monomers should be carried out in a fume hood, and nitrile gloves should be worn to prevent skin contact. The storage temperature should be controlled at 15-25 ℃ to avoid direct sunlight from causing self aggregation. When leaking, use sand to adsorb and do not rinse with water. AIBN is commonly used as an initiator in polymerization reactions, with a half-life of about 10 hours at a reaction temperature of 60 ℃. Accurate temperature control is crucial. The amount of hydroquinone added as a polymerization inhibitor is usually 0.01% -0.05% of the monomer mass.
Traditional monomers have the problem of volatile organic compound emissions, and hydration has become an improvement direction. The water-based dispersion modified with acrylic ester has achieved industrial production, but its hardness is still lower than that of solvent based products. Biobased monomers such as methyl methacrylate extracted from castor oil can reduce petroleum dependence, but the current cost is a barrier to promotion. UV curing technology can reduce energy consumption and requires the use of specific photoinitiators, which has potential applications in the field of 3D printing.
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