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Study of Hot Pressing Compound Technology to Wood and Waste Rubber Powder Composites

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Tutor: LiJian
School: Northeast Forestry University
Course: Wood Science and Technology
Keywords: wood fiber,wood shaving,waste rubber powder,composites,modifiedtechnology
CLC: TS653.5
Type: Master's thesis
Year:  2013
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The paper takes wood fiber or wood shaving, waste rubber powder as materials, chooses a few wood materials and common adhesives, then manufactures the wood-waste rubber powder composites by hot pressing technology. The study takes hot-press temperature, hot-press time, adhesives consumption, rubber powder content as factors, then sets each level variable, finds better technological conditions by orthogonal experimental design. We modify waste rubber powder in microwave, acid, alkali, hydrogen peroxide, ultraviolet light and moisture condition respectively, then probe the influence about processed rubber powder to mechanical or hydrophobic property of composites. The paper makes the infrared spectroscopic analysis to modified rubber powder, also makes the observation and analysis to wood-rubber powder composites by scanning electron microscope, so we make the compared analysis to the property and impact factor about the composites of wood and waste rubber powder at macroscopical or microcosmic field. The study contents of thesis are as follows:(1) In the condition of polymerized melamine-modified urea-formaldehyde resin, We set technology factor and level, manufacture wood and rubber composites by orthogonal experimental design. Then we have a direct analysis to mechanical property of the composites. The result indicates that the mechanical property is the best when170¡æfor hot-press temperature,7minutes for hot-press time,14%for adhesives consumption,20%for rubber powder content. In the best technology condition, we make composites of wood shavings and rubber powders which is modified in concentrated sulfuric acid, sodium hydroxide, hydrogen peroxide, ultraviolet light and moisture environment respectively:Then we detect the mechanical property and hydrophobicity of composites, the result was shown that the best property exists in alkali condition. In the condition of blended melamine-modified urea-formaldehyde resin, we make composites of wood fiber and rubber powder processed in sodium hydroxide when30%for rubber powder content and the same for the other factors; by detecting the mechanical property and having a comparison to unmodified situation, the property of composites does not improve, this still needs further study.(2) In the condition of isocyanate and urea-formaldehyde resin, we make the composites of wood shavings and rubber powders when30%for rubber powder content, probe the influence about the gluing way and proportion to composites by detecting the mechanical property; the result shows that4%for isocyanate and9%for urea-formaldehyde resin in the mixed case is the better method. We process rubber powder by regulating intensity and time of microwave, make the composites of wood shavings and rubber powders, detect mechanical and hydrophobic property, and then conclude that:the mechanical property of composites improves when the powder is processed by microwave, except stable in160W/5min; the property becomes better as intensity on the rise and time on the decline accordingly. The variation about hydrophobicity of the composites is not big when the powder is processed in microwave. The best hydrophobic property of the composites exists in480W/3min, which is in line with thickness swelling rate of water absorption for2hours. After processing rubber powder in the sodium hydroxide, the experiment makes the composites of wood shavings and rubber powders when180¡æfor hot-press temperature and the same for the other factors; the results show that the mechanical property of composites becomes better.(3) We make the composites of wood shavings and rubber powders processed in the sodium hydroxide when16%for blended melamine-modified urea-formaldehyde resin adhesives consumption,30%for rubber powder content. The results also show that the mechanical property of composites becomes better.(4) By the Fourier Transform Infrared Spectroscopy of rubber powders processed in unmodified, acid, alkali, hydrogen peroxide condition respectively, characteristic absorption peak of hydroxyl appears only in alkali condition. After processed in different microwave irradiation or ultraviolet light and moisture environment, the rubber powders are not modified obviously in ultraviolet light and moisture, but modified in microwave condition. Hydroxyl appears on the surface of rubber powder irradiated in microwave, which is benefit for the combination between wood and rubber powder.(5) By the observation from scanning electron microscope to the fractured surface of wood and rubber composites, the rubber powders processed in alkali condition are more easier to combine with the wood fiber. The interfacial combination of the composites about wood shavings and rubber powders is fine when640W/2min or480W/3min for irradiation condition, the powders are more successional, the mechanical property of the composites shows well in macroscopical field.
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