Layered hydrophobically modified waste paper reinforced polymer composite material, preparation method and application thereof
A technology of hydrophobic modification and composite materials, applied in chemical instruments and methods, synthetic resin layered products, paper/cardboard layered products, etc., can solve damage to paper integrity, fiber dissociation, and inefficient paper modification methods And other issues
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Embodiment 1
[0036] 1. Preparation:
[0037] (1) Immerse the waste newspaper (200mm*200mm*0.050mm) in the ethanol solution of 5wt% long-chain fatty acid (octadecanoic acid) of 70mL, and wait for the organic solvent to volatilize completely; Dry at 150°C for 2 hours to obtain a hydrophobically modified newspaper;
[0038] (2) Alternately laminate single-layer hydrophobically modified newspaper and single-layer polyethylene film (200mm*200mm*0.015mm) to form a blank, a total of 40 layers, put it in a hot press molding machine, and keep the pressure at 160°C for 2MPa hot pressing After 25 minutes, a layered hydrophobically modified waste paper reinforced polymer composite material with a thickness of 1 mm was obtained.
[0039] 2. Performance test: the water contact angle of the above-mentioned hydrophobically modified newspaper is 108.2°, the 2h water absorption rate is 30.7%, the (dry) tensile strength is 66.4MPa, and the (wet) tensile strength is 47.8MPa; The 2h water absorption rate of ...
Embodiment 2
[0042] The difference from Example 1 is that: the long-chain fatty acid described in step (1) is hexadecanoic acid; the drying temperature is 130° C.; the drying time is 1 h.
[0043] The water contact angle of gained hydrophobically modified newspaper is 112.5 °, and 2h water absorption rate is 24.3%, (dry) tensile strength is 62.9MPa, (wet) tensile strength is 43.8MPa; Layered hydrophobically modified waste paper enhanced polymerization The 2h water absorption rate of the composite material is 2.5%, the 2h water absorption thickness expansion rate is 1.52%, the (dry) tensile strength is 77.1MPa, and the (wet) tensile strength is 63.55MPa.
[0044] Figure 4 It is the photo of the surface water contact angle of waste newspaper before and after hydrophobic modification in this example. Among them, (a) is waste newspaper, and (b) is hydrophobically modified newspaper. from Figure 4 It can be seen that the surface of unmodified waste newspapers is hydrophilic, and the surfac...
Embodiment 3
[0046] The difference from Example 1 is that: the long-chain fatty acid described in step (1) is eicosanoic acid, the drying temperature is 170° C.; the drying time is 3 hours.
[0047] The water contact angle of gained hydrophobically modified newspaper is 113.8 °, and 2h water absorption rate is 37.8%, and (dry) tensile strength is 64.1MPa, and (wet) tensile strength is 45.0MPa; The 2h water absorption rate of the ethylene composite material is 3.8%, the 2h water absorption thickness expansion rate is 3.3%, the (dry) tensile strength is 70.3MPa, and the (wet) tensile strength is 58.1MPa.
[0048] Image 6 It is the photo of the surface water contact angle of waste newspaper before and after hydrophobic modification in this example. Among them, (a) is waste newspaper, and (b) is hydrophobically modified newspaper. from Image 6 It can be seen that the surface of unmodified waste newspapers is hydrophilic, and the surface of modified waste newspapers is hydrophobic. Figur...
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