Sulphur-containing optical epoxy resin and preparation method thereof

Abstract

The invention discloses sulphur-containing optical epoxy resin and a preparation method thereof. The method comprises the following steps of: taking 2,5-disulfydryl-1,3,4-DMTD and epoxy chloropropane as reaction raw materials; taking one or more of an alkaline solution, quaternary ammonium salt and triphenylphosphine as catalysts; taking aqueous solution or solid of one or more of sodium hydroxide, lithium hydroxide and potassium hydroxide as reaction raw materials in the second step; taking one or more of methylbenzene, dimethylbenzene, benzene, ethylbenzene, diethylbenzene, carbon tetrachloride, methyl isobutyl ketone and methyl ethyl ketone as solvents; and finally, drying in vacuum at room temperature or under the ultra-low temperature condition to obtain dimercaptothiodiazole glycidyl ether epoxy resin. The prepared epoxy resin has the advantages of being high in epoxy value, low in viscosity, higher in refractive index, better in transparent property and the like. The epoxy resin can be applied to the fields, such as optical packaging, optical adhesive, optical part and the like.

Description

technical field [0001] The invention relates to an epoxy resin, in particular to an optical epoxy resin with high refractive index containing sulfur atoms, in particular to a sulfur-containing optical epoxy resin with high refractive index and a synthesis method thereof. Background technique [0002] With the advancement of science, optical materials are increasingly used in technology and life. Epoxy resin is widely used in the field of optical resins due to its characteristics of easy curing, adjustable curing conditions, and good transparency, such as optical devices, optical packaging, and optical adhesives. However, epoxy has a low refractive index. The refractive index of ordinary epoxy resin is about 1.57, which is far from meeting the increasingly high requirements of optical materials. [0003] Inorganic materials generally have a relatively high refractive index. For example, titanium dioxide is widely used as a white pigment because of its particularly high ref...

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Problems solved by technology

Guan Jianguo et al. (Guan Jianguo, Huang Jun, Yuan Runzhang. Current status and research progress of optically transparent materials II: Organic-inorganic nanocomposite optically transparent materials [J]. Journal of Wuhan University of Technology, 1998, 20(9): 11-13) It is pointed out that there are several problems in the preparation of monolithic optically transparent composite materials by the traditional sol-gel method, which is a nanocomposite technology: (1) low molecular by-products such as water and alcohol produced in the process of volatilization, hydrolysis and polycondensation The product and a large amount of solvent will have serious volume shrinkage (greater than 50%), and then bring large internal stress and significant cracks, so it is difficult to make a block optically transparent material with expected size and shape (such as thickness (>10μm); (2) The drying rate is extremely slow, generally taking several weeks or even months; (3) For long-term use of nanocomposite optically transparent materials, there may be a large phase separation due to nanoparticle agglomeration, which may cause light The problem of increased scattering loss of

[0005] Synthesis and structural characterization of phenylthioethylthiopropylene oxide [J] (Wu Biyao, Zhang Daohong, Zhang Yu, Journal of Wuhan Institute of Chemical Technology, 2003, 25(4): 37-39) discloses a synthetic phenylthioethylthio The method of propylene oxide, the composition is a light yellow liquid with a refractive index of 1.60, but this is a monofunctional epoxy resin, it is difficult to obtain a high-performance cured product by curing

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