Epoxy resin adhesive synthesized by alkali lignin through in-situ autocatalysis and preparation method of epoxy resin adhesive
A technology of alkali lignin and epoxy resin, applied in the field of materials and chemical industry, can solve the problems of agglomeration, reduced activity, difficulty in dissolution, etc., and achieve the effects of reducing production cost, improving lignin activity, and low free phenol content
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Embodiment 1
[0019] (1) Mix sulfuric acid and rice husk, heat under stirring, then filter while hot, wash, and dry the filter residue; the mass fraction of the sulfuric acid is 4%, the heating temperature is 105°C, and the heating time is 4h, solid-liquid Mass ratio 1:7;
[0020] (2) mix the lye with the filter residue obtained in step (1), heat under stirring, collect the filtrate by filtration, and obtain the alkali lignin stock solution, wherein the lye is sodium hydroxide, and the concentration of the lye is 3mol / L, the heating temperature is 100°C, the heating time is 3h, and the solid-liquid mass ratio is 1:6;
[0021] (3) Bisphenol A is added to the alkali lignin stock solution obtained in step (2), and the alkali lignin is modified in situ with bisphenol A under stirring and heating conditions to obtain a phenolized modified alkali lignin solution , where the heating temperature is 70°C, the heating time is 2h, and the lignin substitution rate m 木质素 / (m 酚 +m 木质素 ) = 40%;
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Embodiment 2
[0026] (1) Mix sulfuric acid and straw residue, heat under stirring, then filter while hot, wash, and dry the filter residue; the mass fraction of the sulfuric acid is 8%, the heating temperature is 110°C, and the heating time is 4h, solid-liquid Mass ratio 1:8;
[0027] (2) The lye is mixed with the filter residue obtained in step (1), heated under stirring, and the filtrate is collected by filtration to obtain the alkali lignin stock solution, wherein the lye is potassium hydroxide, and the concentration of the lye is 5mol / L, the heating temperature is 100°C, the heating time is 4h, and the solid-liquid mass ratio is 1:8;
[0028] (3) Bisphenol A is added to the alkali lignin stock solution obtained in step (2), and the alkali lignin is modified in situ with phenol under stirring and heating conditions to obtain a phenolized modified alkali lignin solution, wherein , the heating temperature is 60°C, the heating time is 1.5h, the lignin substitution rate m 木质素 / (m 酚 +m 木...
Embodiment 3
[0033] (1) Mix sulfuric acid and bagasse, heat under stirring, then filter while hot, wash, and dry the filter residue; the mass fraction of the sulfuric acid is 6%, the heating temperature is 85°C, and the heating time is 3h, solid-liquid Mass ratio 1:6;
[0034] (2) Mix the lye with the filter residue obtained in step (1), heat under stirring, collect the filtrate by filtration, and obtain the alkali lignin stock solution, wherein the lye is a mixed solution of calcium hydroxide and sodium hydroxide, and the alkali The concentration of the liquid is 2mol / L, the heating temperature is 75°C, the heating time is 4h, and the solid-liquid mass ratio is 1:4;
[0035] (3) Bisphenol A is added to the alkali lignin stock solution obtained in step (2), and the alkali lignin is modified in situ with phenol under stirring and heating conditions to obtain a phenolized modified alkali lignin solution, wherein , the heating temperature is 70°C, the heating time is 1.5h, the lignin substit...
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