| 第 46 卷第 2 期 |  | Vol. 46 No. 2 | | 2016 年 4 月 | Apr 2016 |
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所屬欄目：功能材料
兩種小分子有機酸修飾的白泥對丁腈橡膠復合材料力學(xué)性能的影響 |
| 羅瓊林，段錦華，徐蓓玉，曹理朝，蘇勝培*
（湖南師范大學(xué) 化學(xué)化工學(xué)院 資源精細化與先進(jìn)材料湖南省高校重點(diǎn)實(shí)驗室，湖南 長(cháng)沙 410081） |
| 摘 要：利用草酸、乙酸作為白泥的修飾劑，對白泥進(jìn)行濕法修飾，而后利用石蠟對白泥進(jìn)行二次包覆制備了有機修飾白泥，并將其作為橡膠填料填充到丁腈橡膠（NBR）中制備了修飾白泥／NBR（300：100）母膠。將不同份數母膠填充到NBR中制備了不同白泥含量的白泥／NBR復合材料�？疾炝四改z用量，修飾劑種類(lèi)及用量對NBR復合材料的硫化性能以及力學(xué)性能的影響。實(shí)驗結果表明：當修飾劑的用量逐步增加（以干白泥質(zhì)量計算）時(shí)，母膠填充的白泥／NBR復合材料的力學(xué)性能呈現先增大后減小的趨勢。草酸用量為白泥的2%且母膠份數為75 phr時(shí)其白泥／NBR復合材料的力學(xué)性能達到較佳值：拉伸強度11.0 MPa、扯斷伸長(cháng)率483%、300%定伸應力3.9 MPa，與硬脂酸用量為白泥2%且母膠份數為75 phr時(shí)其白泥／NBR復合材料的拉伸強度、扯斷伸長(cháng)率、300%定伸應力進(jìn)行對比分別提高196%、155%、115%；乙酸用量為白泥的2%且母膠份數為75 phr時(shí)其白泥／NBR復合材料的力學(xué)性能達到最佳值：拉伸強度10.0MPa、扯斷伸長(cháng)率463%、300%定伸應力3.6 MPa，與硬脂酸用量為白泥2%且母膠份數為75 phr時(shí)其白泥／NBR復合材料的拉伸強度、扯斷伸長(cháng)率、300%定伸應力進(jìn)行對比分別提高179%、150%、106%。樣品斷面掃描電鏡（SEM）分析結果表明，白泥經(jīng)有機修飾后在丁腈橡膠中分散均勻，與基體橡膠的相容性好。多項實(shí)驗結果表明：利用草酸、乙酸修飾白泥并制備白泥橡膠母膠可作為白泥綜合利用的一種有效方法。 |
| 關(guān)鍵詞：草酸；乙酸；白泥；白泥／丁腈橡膠復合材料 |
| 中圖分類(lèi)號：TQ333 文獻標識碼：A 文章編號：1009-9212（2015）06-0047-07 |
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| The Effect of Two Kinds of Small Molecule Organic Modifiers on the Mechanic Properties of Lime Mud /NBR Composites |
| LUO Qiong-lin, DUAN Jin-hua, XU Bei-yu, CAO Li-chao, SU Sheng-pei*
(College of Chemistry and Chemical Engineering, Key Lab of Sustainable Resources Processing and Advanced Materials, Hunan Normal University, Changsha 410081, China) |
| Abstract：Lime mud was modified by wet method using oxalic acid or acetic acid as modifier, and further coating of the modified lime mud with paraffin was performed to obtain the organically-modified lime mud. The lime mud/NBR(300:100) master-batch prepared using the organically-modified lime mud as rubber filler was used to prepare lime mud/NBR composites at different loading of lime mud. The effect of the modifiers and dosage of the master-batch on the vulcanization characteristics and the performance of the composites was explored. Experimental results showed that organically-modified lime mud using acetic acid or oxalic acid hadmproved the mechanical performance of the composite materials compared to that of stearic acid. With the increasing of the dosage (in terms of quality of dry lime mud) of the modifier, the mechanical performance of the composite materials was improved first and then dropped. The best mechanical performance of the composite materials was achieved when the loading of 2% oxalic acid master-batch was 75 phr: the tensile strength of rubber composite is of 11.0 MPa; the elongation at break is of 483%; the 300% modulus is of 3.9 MPa. For the composite materials, compared to lime mud master-batch modified by stearic acid, lime mud master-batch modified by oxalic acid, the mechanical properties including tensile strength, elongation at break, 300% modulus of the composite materials increased by 196%, 155%; 115% respectively. For the acetic acid modified lime mud, the best mechanical performance of the composite materials was achieved when the acetic acid dosage was 2% of the lime mud master-batch and the master-batch loading was 75 phr, the tensile strength of rubber composite is of 10.0 MPa; the elongation at break is of 463%; the 300% modulus is of 3.6 MPa. For the composite materials, compared to lime mud master-batch modified by stearic acid, lime mud master-batch modified by acetic acid, the mechanical performance, including the tensile strength, elongation at break, 300% modulus of the composite materials increased by 179%, 150%, and 106%,respectively. Experimental results of SEM indicated that the organically-modified lime mud was well-dispersed in the rubber compared to that of unmodified lime mud. The results showed that the mechanical properties of rubber material can be improved greatly by the above organically-modification methods. |
| Key words：oxalic acid; acetic acid; lime mud; lime mud/NBR composites |
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基金項目： 湖南省戰略科興產(chǎn)業(yè)科技攻關(guān)項目（S2014G217K）資助。
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作者簡(jiǎn)介：羅瓊林（1988-），女，湖南郴州人，博士研究生，研究方向：高分子復合材料（E-mail：qionglinluo@163.com）。
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聯(lián) 系 人： 蘇勝培，教授，博士研究生導師（E-mail：sushengpei@yahoo.corn）。
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收稿日期：2016-04-06
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