A kind of using modified lignin to strengthen rigid polyurethane material and preparation method thereof
A technology of rigid polyurethane and lignin, which is applied in the field of preparation of modified lignin reinforced rigid polyurethane materials, can solve the problems of limited number of hydroxyl groups, unsatisfactory enhancement effect of mechanical properties of polyurethane materials, low degree of reaction, etc., and achieve reactivity Improvement, mechanical properties, and broad application prospects
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example 1
[0027] Collect papermaking black liquor and mix it with sodium hydroxide at a mass ratio of 10:1, heat and boil for 30 minutes, filter the boiled papermaking black liquor, separate the filtrate, adjust the pH of the filtrate to 4.0 with 2mol / L hydrochloric acid, and let it stand Precipitate for 1h, filter to obtain the precipitate, which is lignin; weigh the lignin and put it into a beaker, then add a 30% sodium silicate solution with a mass fraction of 3 times the lignin mass into the beaker, place the beaker on a shaker, Shaking and impregnating for 3 hours, after the shaking and impregnating, filter and separate to obtain the filter residue, which is the pre-modified lignin; mix the pre-modified lignin and the sodium hydroxide solution with a mass fraction of 5% in a mass ratio of 1:5, at 60 Stir and dissolve at ℃ for 2 hours to obtain a pre-modified lignin solution, add 3% sodium borohydride of pre-modified lignin mass to the pre-modified lignin solution, stir evenly to obt...
example 2
[0029]Collect papermaking black liquor and mix it with sodium hydroxide at a mass ratio of 10:1, heat and boil for 35 minutes, filter the boiled papermaking black liquor, separate the filtrate, adjust the pH of the filtrate to 4.3 with 2mol / L hydrochloric acid, and let it stand Precipitate for 2 hours, filter to obtain the precipitate, which is lignin; weigh the lignin and put it into a beaker, then add a 30% sodium silicate solution with a mass fraction of 4 times the lignin mass into the beaker, place the beaker on a shaker, Shaking and impregnating for 4 hours, after the shaking and impregnating, filter and separate to obtain the filter residue, which is the pre-modified lignin; mix the pre-modified lignin and the sodium hydroxide solution with a mass fraction of 5% in a mass ratio of 1:5, and mix it at 63 Stir and dissolve at ℃ for 2 hours to obtain a pre-modified lignin solution, add sodium borohydride with 4% pre-modified lignin mass to the pre-modified lignin solution, s...
example 3
[0031] Collect the papermaking black liquor and mix it with sodium hydroxide at a mass ratio of 10:1, heat and boil for 40 minutes, filter the boiled papermaking black liquor, separate the filtrate, adjust the pH of the filtrate to 4.5 with hydrochloric acid with a concentration of 2mol / L, and let it stand Precipitate for 3 hours, filter to obtain the precipitate, which is lignin; weigh the lignin and put it into a beaker, then add a 30% sodium silicate solution with a mass fraction of 5 times the lignin mass into the beaker, place the beaker on a shaker, Shaking and impregnating for 5 hours, after the shaking and impregnating, filter and separate to obtain the filter residue, which is the pre-modified lignin; mix the pre-modified lignin and the sodium hydroxide solution with a mass fraction of 5% in a mass ratio of 1:5, at 65 Stir and dissolve at ℃ for 3 hours to obtain a pre-modified lignin solution, add 5% sodium borohydride of pre-modified lignin mass to the pre-modified li...
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