Modified lignin, preparation method and application of modified lignin in toughening flame-retardant composite material
A technology of flame-retardant composite materials and lignin, which is applied in the field of preparation of toughened flame-retardant composite materials, can solve problems such as poor dispersion, degradation of polyester polymer materials, and polymer embrittlement, and achieve the effect of improving toughness
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Embodiment 1
[0026] A preparation method of modified lignin, the steps are:
[0027] (1) Add melamine and formaldehyde with a mass ratio of 1:0.15 to water, and stir for 2 hours at 60°C;
[0028] (2) Alkaline lignin, formaldehyde and phytic acid are gradually added to the solution obtained in step (1) in a mass ratio of 0.5:0.25:0.5:1 to melamine, react at 90° C. for 5 hours, and filter and dry to obtain Modified lignin, denoted as LMP;
Embodiment 2
[0030] A preparation method of modified lignin, the steps are:
[0031] (1) Add melamine and formaldehyde with a mass ratio of 1:0.25 to water, and stir for 0.5h at 80°C;
[0032] (2) adding alkaline lignin, formaldehyde and phytic acid to melamine in a mass ratio of 1:0.5:1:1 into the solution obtained in step (1) step by step, reacting at 90° C. for 5 hours, and filtering and drying to obtain Modified lignin, denoted as LMP';
[0033] According to the formula and process listed in Table 1, the products obtained in Examples 1 and 2 were blended and granulated to obtain the masterbatches of the modified lignin toughened and flame-retardant composite materials of Examples 5-11 and the corresponding Comparative Examples 1-4.
[0034] Table I
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[0036]
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