Cellulose Nanocrystalline Modified Fabricated Exterior Wall Panel Splicing Seam Adhesive Sealing Material
A sealing material, cellulose technology, applied in the direction of adhesives, inorganic adhesives, polymer adhesive additives, etc., can solve the problems of high contact surface requirements, difficult construction, affecting the integrity of the building structure, etc. Improve pore structure characteristics, not easy to crush and fall off, and the effect of considerable application prospects
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Embodiment 1
[0034] 1) Freeze-dry the hydroxycellulose nanocrystals in a vacuum environment of -5°C and 15pa, add the freeze-dried hydroxycellulose nanocrystals and maleic anhydride into dimethylformamide, stir evenly, and the obtained solution Centrifugation, the centrifuged product is washed with the solvent recovered by centrifugation, separated, and repeated 2-3 times, and the centrifuged product is dried under reduced pressure at 20° C. under a vacuum environment of 15pa to obtain acidified cellulose nanocrystals;
[0035] The dosage of the hydroxycellulose nanocrystals is 2% of dimethylformamide; the dosage of maleic anhydride is 5% of dimethylformamide;
[0036] 2) Add 3 parts by weight of the acidified cellulose nanocrystals prepared in step 1) into 5 parts of the styrene-acrylic emulsion, microwave conditions, a frequency of 300MHz, and microwave for 3min, so that the acidified cellulose nanocrystals and The styrene-acrylic emulsion undergoes an esterification reaction to obtain c...
Embodiment 2
[0039]1) The hydroxycellulose nanocrystals are freeze-dried in a vacuum environment of -5°C and 15pa, and the freeze-dried hydroxycellulose nanocrystals and 2,3-dimethylmaleic anhydride are added to the cyclohexane solution , stir the obtained solution and centrifuge, the centrifuged product is washed with the solvent recovered by centrifugation, and the separation is repeated 2-3 times.
[0040] The dosage of the hydroxycellulose nanocrystals is 3% of the cyclohexane solution; the dosage of 2,3-dimethylmaleic anhydride is 7% of the organic solvent;
[0041] 2) adding 5 parts by weight of acidified cellulose nanocrystals prepared in step 1) into 7 parts of styrene-acrylic emulsion, microwave conditions, frequency of 350MHz, microwave for 5min, so that the acidified cellulose nanocrystals and The styrene-acrylic emulsion undergoes an esterification reaction;
[0042] 3) To the cellulose nanocrystal / styrene-acrylic emulsion prepared in step 2), add 85 parts by weight of Portlan...
Embodiment 3
[0044] 1) The hydroxycellulose nanocrystals are freeze-dried in a vacuum environment of -5°C and 15pa, and the freeze-dried hydroxycellulose nanocrystals, maleic anhydride and 2,3-dimethylmaleic anhydride are added to the ring. In the hexane solution, stir the obtained solution and centrifuge, and the centrifuged product is washed with the solvent recovered by centrifugation, and the separation is repeated 2-3 times. nanocrystals;
[0045] The dosage of the hydroxycellulose nanocrystal is 3% of the cyclohexane solution; the dosage of maleic anhydride and 2,3-dimethylmaleic anhydride is 7% of the organic solvent; The dosage ratio of methyl maleic anhydride is 1:1.
[0046] 2) adding 7 parts by weight of acidified cellulose nanocrystals prepared in step 1) into 8 parts of styrene-acrylic emulsion, microwave conditions, frequency of 400MHz, microwave 4min, so that the acidified cellulose nanocrystals and The styrene-acrylic emulsion undergoes an esterification reaction to obtai...
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