Cracking lignin and preparation method of lignin-based polyurethane rigid foam
A rigid foam, lignin-based technology, applied in the polymer field, can solve the problems of complex composition, large difference in hydroxyl value, and small addition amount, and achieve the effects of simple synthesis method, stable performance and easy operation.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0034] The wood fiber was pulverized and passed through an 80-mesh standard sieve to obtain wood fiber with uniform particle size. The pulverized wood fiber was dried at 60°C for 3 hours in a vacuum constant temperature drying oven. Get quantitative wood fiber and put it into an autoclave, check the airtightness of the autoclave before the reaction, then seal it, and then use 1MPa H 2 Pressurize to make the pressure of the whole system reach 2MPa, and slowly heat to 250°C. The reaction uses a supported ruthenium metal catalyst, reacts for 4 hours, and uses methanol as a solvent to carry out the catalytic cracking reaction. Take the liquid lignin and methanol in the upper layer of the product, and rotate it under reduced pressure at 40°C to remove methanol to obtain liquid cracked lignin.
[0035] Add 2g of the prepared cracked lignin into the beaker, add the corresponding polyether polyol 5110 according to the mass ratio of 1:9, and add 0.5g catalyst A33, 0.5g stannous octoat...
Embodiment 2
[0037] The wood fiber was pulverized and passed through a 100-mesh standard sieve to obtain wood fiber with uniform particle size. The pulverized wood fiber was dried at 100°C for 2 hours in a vacuum constant temperature drying oven. Take a certain amount of wood fiber and put it into the autoclave, check the airtightness of the autoclave before the reaction, then seal it, then pressurize with 1MPa H2 to make the pressure of the whole system reach 3MPa, and slowly heat to 240°C. The reaction uses a supported ruthenium metal catalyst, reacts for 5 hours, and uses methanol as a solvent to carry out catalytic cracking reaction. The liquid lignin and methanol in the upper layer of the product were taken and rotated at 40°C under reduced pressure to remove the methanol to obtain liquid cracked lignin.
[0038] Add 6g of the prepared cracked lignin into the beaker, add the corresponding PEG (polyethylene glycol) in a mass ratio of 3:7, and add 0.5g catalyst A33, 0.5g stannous octoat...
Embodiment 3
[0040]The wood fiber was pulverized and passed through a 40-mesh standard sieve to obtain wood fiber with uniform particle size. The pulverized wood fiber was dried at 80°C for 3 hours in a vacuum constant temperature drying oven. Take a certain amount of wood fiber and put it into the autoclave, check the airtightness of the autoclave before the reaction, then seal it, then pressurize with 1MPa H2, make the pressure of the whole system reach 1MPa, and slowly heat to 230°C. The reaction uses a supported ruthenium metal catalyst, reacts for 3 hours, and uses methanol as a solvent to carry out catalytic cracking reaction. The liquid lignin and methanol in the upper layer of the product were taken and rotated at 40°C under reduced pressure to remove the methanol to obtain liquid cracked lignin.
[0041] Add 10g of the prepared cracked lignin in the beaker, add the corresponding PPG-1000 (polypropylene glycol) in a mass ratio of 1:1, and add 0.5g catalyst A33, 0.5g stannous octoat...
PUM
| Property | Measurement | Unit |
|---|---|---|
| particle size (mesh) | aaaaa | aaaaa |
| particle size (mesh) | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More