A kind of preparation method of reed-based epoxy resin coating film material
A technology based on epoxy resin and reed, which is applied in the field of preparation of reed-based epoxy resin coating material, can solve the problems of unenvironmental protection, unsatisfactory performance, unsafe preparation method, etc., and achieves good mechanical properties and excellent thermal stability. , good gloss effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0033] Preparation of reed-based epoxy resin cured coating film:
[0034] a. Add reed powder, polyethylene glycol 400 and gallic acid in a mass ratio of 1:5:1 to the hydrothermal reactor, then add 1.5% of the total mass of concentrated sulfuric acid (98%) catalyst to carry out liquefaction reaction for 1.5h , The liquid obtained after the reaction is the reed-based polyol liquefied liquid, with a molecular weight of about 6800 (gel chromatography).
[0035] b. Put 50g of liquefied product and 2g of boron trifluoride ether catalyst into a three-neck round bottom flask equipped with a reflux device, stir and heat to 90°C, slowly add 500g of epichlorohydrin dropwise, and keep for 3h after the dropwise addition is completed Realize the etherification reaction, then use a rotary evaporator to remove excess epichlorohydrin under reduced pressure at 80°C, cool to 60°C, add 50mL of sodium hydroxide with a mass fraction of 30%, and continue the reaction for 2h to realize the epoxidatio...
Embodiment 2
[0040] Preparation of one-component waterborne reed-based epoxy emulsion (R-WEP):
[0041]a. Add reed powder, polyethylene glycol and gallic acid to the hydrothermal reactor in a mass ratio of 1:5:1, then add concentrated sulfuric acid catalyst for liquefaction reaction for 2 hours, and the liquid obtained after the reaction is reed-based polyol In the liquefied liquid, the molecular weight is about 6800 (gel chromatography), and the amount of the acid catalyst is 1.5% of the total mass of reed powder, polyethylene glycol and gallic acid.
[0042] b. Put 50g of liquefied product and 2g of boron trifluoride ether catalyst into a three-neck round bottom flask equipped with a reflux device, stir and heat to 90°C, slowly add 500g of epichlorohydrin dropwise, and keep for 3h after the dropwise addition is completed Realize the etherification reaction, then use a rotary evaporator to remove excess epichlorohydrin under reduced pressure at 80°C, cool to 60°C, add 50mL of sodium hydro...
Embodiment 3
[0053] 10g of reed powder, 50g of polyethylene glycol and 10g of gallic acid were added to the hydrothermal reactor in proportion, and then 2g of concentrated sulfuric acid was added for liquefaction reaction for 1h to obtain the liquefaction liquid of reed-based polyol. The liquefaction rate varies with temperature as:
[0054]
[0055] Add 10g of reed powder, 50g of polyethylene glycol, and 10g of gallic acid into the hydrothermal reactor in proportion, and keep at 160°C for liquefaction reaction for 1 hour to obtain a reed-based polyol liquefaction liquid. The liquefaction rate varies with the mass of the catalyst as follows:
[0056]
[0057] Add 10g of reed powder, 50g of polyethylene glycol and 10g of gallic acid into the hydrothermal reactor in proportion, then add 2g of concentrated sulfuric acid and keep it at 160°C for liquefaction to obtain the liquefied liquid of reed-based polyol. The change of liquefaction rate with reaction time is:
[0058]
[0059] A...
PUM
| Property | Measurement | Unit |
|---|---|---|
| hydroxyl value | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More