Method for synthesizing o-cresol formaldehyde epoxy resin by using cosolvent and recovering cosolvent
A phenolic epoxy resin and phenolic resin technology, applied in the field of epoxy resin synthesis, can solve the problems of high production cost, large side reactions, difficult recovery of cosolvents, etc., and achieve the advantages of increasing yield, reducing hydrolysis and reducing the amount of waste polymer. Effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
Embodiment 1
[0023] In a four-neck flask with stirring, a thermometer, and a condenser, add 75g o-cresol novolac resin, 280g epichlorohydrin and 90g propylene glycol methyl ether. Under the protection of nitrogen, the temperature was raised to 60°C, and 4g of 50% NaOH was added for pre-reaction, and the pre-reaction was maintained for 4h. Reduce the vacuum to 13kPa and add 42g of 50% NaOH to carry out the cyclization reaction. At the same time, the reaction wastewater is separated by distillation, and the reaction time is 6h. Distillation reclaims epichlorohydrin and cosolvent to obtain crude resin, adds new epichlorohydrin 60g and reaction waste water to crude resin, after dissolving, let stand to separate liquids, distill and recover organic solvent, add 400g toluene to dissolve in remaining crude resin, Add 15g15%NaOH at a temperature of 80°C for 2h. After refining, add deionized water to wash until pH = 7-8, and remove the solvent.
[0024] The product indicators are as follows: yiel...
Embodiment 2
[0026] In Example 1, the pre-reaction, reaction and refined alkali were changed to 50% KOH, and all the other conditions were unchanged.
[0027] The obtained product indicators are as follows: epoxy resin yield: 104g, waste polymer amount: 0.87g, auxiliary agent recovery in wastewater: 14.2g, epoxy equivalent: 203.5g / eq, hydrolyzable chlorine 53ppm, inorganic chlorine 1ppm.
Embodiment 3
[0029] In a four-neck flask with stirring, thermometer and condenser, add 75g o-cresol novolac resin, 280g epichlorohydrin and 90g n-butanol. Under the protection of nitrogen, the temperature was raised to 65°C, and 4g of 50% NaOH was added for pre-reaction, and the pre-reaction was maintained for 4h. Reduce the vacuum to 13kPa and add 42g of 50% NaOH to carry out the cyclization reaction, and distill and separate the reaction wastewater at the same time, the reaction time is 6h; then distill and recover epichlorohydrin and co-solvent to obtain a crude resin, and add 60g of new epichlorohydrin to the crude resin and reaction waste water, after dissolving, let stand to separate the liquid, and distill to recover the organic solvent. Add 400g of methyl isobutyl ketone to the remaining crude resin to dissolve, add 15g of 15% NaOH at a temperature of 85°C and refine it for 2h. After refining, add deionized water to wash until pH = 7-8, and remove the solvent.
[0030] The produc...
PUM
Property | Measurement | Unit |
---|---|---|
epoxy equivalent | aaaaa | aaaaa |
epoxy equivalent | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com