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Pridružen/-a: 27.09. 2016, 06:54
Prispevkov: 1069
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 Objavljeno: 06 Jan 2017 03:52 Naslov sporočila: Analysis on the Development of Wood Plastic Material Industr |
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<p>(1) surface grafting method: Grafting is an effective modification method, can be compounded before or at the same time compound grafting of plant fiber. Grafted plant fibers such as maleic anhydride, isocyanates and the like can be used.</p>
<p> (2) interface coupling method: the use of coupling agents and plant fiber covalent bond formation to change the interface adhesion. Such as the use of silane coupling agent, titanate coupling agent, aluminate coupling agent, such as fiber processing to improve the compatibility of fiber and resin. The optimum amount of coupling agent is related to the extent of coupling agent on the surface of wood powder particle. If the amount of coupling agent is too small, because the filler surface of the coating is not complete, it is difficult to form a good molecular layer coupling, not achieve the desired coupling and compatibilization. Too much use, the coupling agent excess, in the wood powder surface will cover too much coupling agent molecules, the formation of multi-molecular layer, easy to cause filler and resin interface between the non-uniformity, and coupling agent in the reaction Of the other groups also produce adverse effects, thereby reducing the mechanical properties of composite materials.</p>
<p> (3) acetylation treatment: plant fiber surface hydroxyl by acetic anhydride or ketene treatment, the polar hydroxyl groups on the wood by the non-polar acetyl substitution to produce esters. Acetylation of acetic anhydride, glacial acetic acid, and sulfuric acid is usually carried out industrially. </p>
<p>(4) low-temperature plasma treatment: low-temperature plasma treatment mainly caused by chemical modification, polymerization, free radical production and plant fiber crystallinity and other physical changes. </p>
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