Composite compositions and composites
A technology of composites and compositions, applied in the direction of adding inorganic compounds, textiles, papermaking, paper, etc., can solve the problems of limiting the use of composite materials and changing greatly
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Embodiment 1A
[0145] The cellulose nanofiber dispersion (10 parts by weight of solid content) obtained in Production Example A with a solid content concentration of 0.2% by weight was filtered under reduced pressure to remove water, and was replaced with methanol five times. Next, the cellulose nanofiber methanol dispersion was filtered under reduced pressure to remove methanol, and replaced with 90 parts by weight of alicyclic epoxy monomer containing 1 part by weight of a thermal cationic catalyst (SI-100L) and the The replacement operation was repeated 5 times. Then, the obtained cellulose nanofiber-dispersed epoxy resin (cellulose solid content is 10% by weight) was cast, and heated at 100°C for 2 hours, and then heated at 150°C for 2 hours to make it solidify. A composite with a thickness of 1 mm was thus obtained. The obtained composite was cut to a width of 10 mm to prepare a test piece for flexural strength measurement. The bending strength measured for this test piece was 48N. ...
Embodiment 2A
[0147] The cellulose nanofiber dispersion with a solid content concentration of 0.2% by weight (solid content: 15 parts by weight) obtained in Production Example A was filtered under reduced pressure to remove water, and then freeze-dried to obtain cellulose nanofibers. Next, 15 parts by weight of cellulose nanofibers were added to 85 parts by weight of phenol novolac resin and 15 parts by weight of hexamethylenetetramine, and the resulting mixture was mixed for 3 minutes with a stirrer. Then, the mixture was kneaded using two heating rolls at 100° C. to obtain a thermosetting resin molding material. The obtained molding material was heated at 125° C. for 2 hours by extrusion molding, and then heated at 150° C. for 2 hours to be cured. A composite body with a thickness of 1 mm was thus obtained. The obtained composite was cut to a width of 10 mm to prepare a test piece for flexural strength measurement. The bending strength measured for this test piece was 60N.
Embodiment 3A
[0149] To the cellulose nanofiber dispersion (100 parts by weight of solid content) obtained in Production Example A with a solid content concentration of 0.2% by weight, tetraethoxysilane was added in the same weight as the solid content of cellulose nanofibers. , and stirred at room temperature for 30 minutes. The obtained mixed solution was poured into a mold-released Petri dish, evaporated in an oven at a temperature of 50°C, and dried in a vacuum oven at 120°C. A transparent film having a thickness of 30 μm was thus obtained. The total light transmittance, thermal expansion coefficient, and humidity expansion coefficient were measured for this film, and the results were as follows: the total light transmittance was 90%, the thermal expansion coefficient was 11 ppm / °C, and the humidity expansion coefficient was 26 ppm / humidity%.
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