Physicochemical properties of glycidyl methacrylate as synthetic raw material
Chinese name: Glycidyl methacrylate
Alias: GMA; anhydrous glyceryl methacrylate
English name: Glycidyl methacrylate
Synthetic raw material glycidyl methacrylate
Safety terms for glycidyl methacrylate, a synthetic raw material
After accidental contact with eyes, please rinse immediately with plenty of water and seek medical advice.
Risk terms for synthetic raw materials glycidyl methacrylate
Harmful if inhaled, in contact with skin and if swallowed.
Irritation to eyes and skin.
May cause sensitization in contact with skin.
The main uses of synthetic raw material glycidyl methacrylate
1. Mainly used in powder coatings, but also in the bonding of thermosetting coatings, fiber treatment agents, adhesives, antistatic agents, vinyl chloride stabilizers, rubber and resin modifiers, ion exchange resins and printing inks. agent.
2. Used as functional monomer for polymerization reaction. Mainly used to manufacture acrylic powder coatings. It is used as a soft monomer to copolymerize with hard monomers such as methyl methacrylate and styrene. It can adjust the glass transition temperature and flexibility and improve the gloss, adhesion and weather resistance of the coating film. wait. Also used in the manufacture of acrylic emulsions and non-woven fabrics. As a functional monomer, it can be used to manufacture photosensitive resins, ion exchange resins, chelating resins, medical selective filtration membranes, dental materials, anticoagulants, solvent-free adsorbents, etc. It is also used to modify polyolefin resin, rubber and synthetic fibers.
3. Because its molecule contains both carbon-carbon double bonds and epoxy groups, it is widely used in the synthesis and modification of polymer materials. Used as reactive diluent for epoxy resin, stabilizer for vinyl chloride, modifier for rubber and resin, binder for ion exchange resin and printing ink. It is also used in powder coatings, thermosetting coatings, fiber treatment agents, adhesives, antistatic agents, etc. In addition, GMA also significantly improves the adhesion, water resistance, and solvent resistance of adhesives and non-woven coatings.
4. In electronics, it is used for photoresist films, electron beams, protective films, and far-infrared phase X-ray protective films. In terms of functional polymers, it is used in ion exchange resins, chelating resins, etc. In terms of medical materials, it is used in anti-blood coagulation materials, dental materials, etc.
Used in adhesives and non-woven fabrics. When used in acrylic emulsions, it can improve its adhesion to metal, glass, cement, polyvinyl fluoride, etc.; when used in non-woven fabrics with synthetic latex, it can If the hand feel is affected, its washability can be improved. When used in the processing of synthetic resin materials, fluorobenzene boric acid can improve its injection moldability and extrusion moldability, and significantly improve the adhesion between resin and metal. Used for synthetic fibers, it can improve the coloring strength of poorly dyed fibers, improve color fastness, and improve anti-wrinkle and anti-shrink capabilities. This product can improve the sensitivity, resolution and corrosion resistance of photosensitive resin. This product is grafted with polyolefin to improve tensile strength and bending strength. In addition, this product can also be used as a raw material for ion exchange resins, chelating resins, medical selective filtration membranes, anticoagulants, dental materials, solvent-free adsorbents, etc. Also used for rubber modification.
Preparation method of synthetic raw material glycidyl methacrylate
Traditional preparation method of synthetic raw material glycidyl methacrylate
Glycidyl methacrylate can be prepared by reacting epichlorohydrin (3-chloro-1,2-epoxypropane) with methyl methacrylate or alkali metal methacrylate, and then dechlorinating. However, the acid (or salt) produced by this method requires environmental protection measures.
New preparation method of synthetic raw material glycidyl methacrylate
Methyl methacrylate reacts with alkali metal hydroxide in a low molecular alcohol and a high boiling point solvent in the presence of a polymerization inhibitor to form an alkali metal (meth)acrylate salt, which is dried to remove water and low molecular weight After volatiles such as alcohol are added, epichlorohydrin (ECH) and a phase transfer catalyst are added to perform an esterification reaction to obtain a crude ester product containing glycidyl (meth)acrylate. The crude ester is sent directly to the plant without solid-liquid separation. into a special distillation tower for refining. For the process route using MAA (methacrylic acid) as raw material, this method can also be used for refining. Compared with the existing technology, the process route of the present invention is short, the process indicators are advanced, and the product purity and yield are as high as over 98%.
Glycidyl methacrylate transesterification method of synthetic raw materials
Using glycidyl and methyl methacrylate as raw materials, glycidyl methacrylate can be obtained by transesterification.
Properties and Stability of Synthetic Raw Materials Glycidyl Methacrylate
Avoid contact with acids, oxides, ultraviolet radiation, and free radical initiators. Soluble in almost all organic solvents and insoluble in water. This product is slightly toxic.
Storage method of glycidyl methacrylate, a synthetic raw material
Stored in a cool, ventilated warehouse. Keep away from fire and heat sources. The storage temperature should not exceed 30℃. Keep away from light. They should be stored separately from acids and oxidants, and avoid mixed storage. Use explosion-proof lighting and ventilation facilities. It is prohibited to use mechanical equipment and tools that are prone to sparks. The storage area should be equipped with leakage emergency measures.�Equipment and suitable containment materials.
Synthesis method of glycidyl methacrylate, a synthetic raw material
Obtained from the reaction of sodium methacrylate and epichlorohydrin. Raw material consumption quota: methacrylic acid 780kg/t, epichlorohydrin 690kg/t, sodium hydroxide 330kg/t. It can also be obtained by the transesterification reaction of methyl methacrylate and glycidyl alcohol. Among them, the former method has easy-to-obtain raw materials and mild reaction, and is currently a commonly used method in the world. Process flow:
Preparation of methacrylic acid sodium salt In a four-neck bottle equipped with a stirrer, reflux condenser, thermometer and dropping funnel, add 100ml of methacrylic acid, then add 100ml of solvent, stir evenly, and slowly Add 103.5g of 50% NaOH aqueous solution dropwise. Control the reaction temperature not to exceed 55°C of tetrahydrofuran. After the dropwise reaction is completed, stir for 30 minutes, add 0.2g of polymerization inhibitor p-hydroxyanisole, dehydrate under reduced pressure at 85-90°C, 30.7-36.0KPa, dry to obtain sodium salt, seal and store for later use.
Synthesis of GMA In a three-necked flask equipped with a stirrer, water separator and thermometer, add 40g of dry methacrylic acid sodium salt, 0.2g of polymerization inhibitor p-hydroxyanisole, and 1.2g of catalyst (several types respectively). Quaternary ammonium salt (usually triethylbenzyl ammonium chloride) and 250g epichlorohydrin are stirred and reacted. The reaction temperature is controlled at 105-110°C and the reaction time is 3.0h. After the reaction is completed, filter to remove NaCL, and the resulting filtrate is distilled under reduced pressure to distill epichlorohydrin under the conditions of 80-80°C/6.7-80.KPa; and then distilled out under reduced pressure under the conditions of 100-105°C/1.1-1.6KPa ProductGMA.
