共查询到19条相似文献,搜索用时 93 毫秒
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DMSO湿法PAN纤维截面形状形成条件的研究 总被引:3,自引:0,他引:3
对DMSO(二甲基亚砜)湿法制备PAN(聚丙烯腈)纤维的截面形状的形成因素进行了研究。随着凝固浴浓度的增大和温度的升高,纤维截面形状由椭圆形或肾形逐渐变为圆形。当凝固浴浓度在一定范围(55%-70%)时,不同凝固浴浓度对应一个凝固浴温度下限值,在该下限温度以上都可得到圆形截面纤维,且凝固浴浓度越低,此下限温度越高。纤维离开凝固浴后,截面形状基本形成并固定,水洗、拉伸、喷丝速度和干燥对纤维截面形状的形成影响都很小。 相似文献
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通过母粒共混熔融纺丝法制备了圆形、三角形和十字形截面的聚酰胺6/石墨烯复合纤维。采用光学显微镜观察了纤维的截面形貌并计算其异形度,采用负离子测试仪、远红外发射率测试仪、恒温恒湿干燥箱表征了不同截面纤维的负离子释放性能、远红外辐射性能和纤维吸湿及其干燥速度。研究表明:圆形、三角形和十字形截面纤维的异形度分别达到6.31%、34.80%和58.29%。相对而言,异形度增大,会明显影响纤维的负离子释放浓度、吸湿速度及干燥速度,其中十字形截面纤维的负离子释放浓度最高达到1 820个/cm~3;另一方面,异形度的变化不会对纤维远红外辐射能力产生明显的影响,其远红外发射率在0.90~0.93,远红外辐射温升约为1.70℃。 相似文献
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《合成纤维工业》2018,(6)
以聚对苯二甲酸乙二醇酯(PET)纺丝级切片及市售炭黑为原料,采用原液着色法及高速纺丝-拉伸(POY-DT)工艺制备十字形、扁平形、圆形、三角形截面无染黑色涤纶DT长丝,通过对纤维不同截面形状、纤维束间不同堆砌结构及孔隙面积的分析,研究纤维截面形状及集束状态对其黑度的影响。结果表明:制备的异形涤纶DT长丝中三角形纤维黑度最大,十字形纤维黑度最小;异形截面纤维内部有效平均光程从小到大依次为十字形、扁平形、圆形、三角形,截面内部有效平均光程越长,光线碰到炭黑粒子概率越大,光线完全被吸收概率越大,纤维黑度提高;异形纤维束集束孔隙面积从小到大依次为十字形、扁平形、圆形、三角形,纤维束间孔隙面积越大,光线在纤维间光程越长,光线被炭黑及聚酯吸收的概率越大,纤维黑度提高。 相似文献
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本文采用定性和定量的测试手段,着重研究了拉伸倍数和中空硬弹聚丙烯单丝中微孔结构的关系。试验发现,该单丝的微孔结构与拉伸倍数有关。在一定的拉伸倍数下,其微孔不仅尺寸大、数量多,而且还能部分沟通纤维壁。在与其它几种聚丙烯单丝的比较中,发现该单丝不论在微孔的数量和尺寸上,或者是沟通纤维壁的性能上,都大大超过了普通硬弹聚丙烯单丝。其中双组分中空硬弹聚丙烯单丝又优于单组分中空硬弹聚丙烯单丝。 相似文献
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本文研究了假捻机第2热箱温度T_2的变化对异形和普通圆形涤纶POY的卷曲和力学性能的影响。T_2从175℃降至85℃,异形(三角中空、八叶形)和圆形纤维的卷曲收缩率(E值)和卷曲稳定性(B值)分别可提高至35%和85%,五叶异形纤维的E值和B值只能达到28%和83%。T_2对各异形纤维的断裂强伸度影响甚小。断裂强伸度八叶形纤维为3.2~3.3cN/dtex,23~24.5%;三角中空纤维为3.2~3.4cN/dtex,23~24.5%;五叶形纤维为2.4~2.5cN/dtex,16~18%。五叶形纤维综合性能较差是由于其异形度较大,熔纺时纤维冷却较快,径向温度和粘度梯度大,导致纤维所受内应力大且应力不均匀。 相似文献
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The relation between color and gloss of injection‐molded plastic specimens was evaluated by means of a 45°/0° geometry spectrophotometer and a glossmeter. The specimens were plaques having one smooth, glossy field and one rougher, textured region made of two different polymeric materials (acrylonitrile‐butadiene‐styrene and polypropylene) in a range of colors. A significant influence of the lightness L* of the specimens on the measured gloss of the textured field, with a low gloss appearance, was found. This can probably be attributed to a contribution from bulk scattering, which is linked to the reflectance from within the specimen. The influence of texture on the measured color of the plaques was assessed by evaluating the color difference between the smooth field and the more textured area on the specimens. When the surface was textured, the color changed; in general it became lighter and less saturated. The magnitude of the change depended on the color of the material. The darker the material was, the larger was the increase in lightness L* as the surface became rougher. The shift in chroma C* was determined not only by the saturation but also by the lightness of the specimens. Darker specimens exhibited a larger decrease in chroma when the surface was textured. The change in the measured color caused by increasing the surface roughness could be predicted in a satisfactory manner using a model developed for xerographic printing paper. © 2009 Wiley Periodicals, Inc. Col Res Appl, 34, 291–298, 2009 相似文献
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五叶形涤纶POY生产工艺探讨 总被引:2,自引:1,他引:1
采用半消光聚对苯二甲酸乙二酯(PET)切片为原料,熔融纺丝生产出262 dtex/72 f五叶形涤纶POY,探讨了其主要的生产工艺。结果表明:选择五叶形喷丝孔喷丝板,纺丝温度为295℃;侧吹风温度22℃,速度0.30~0.45 m/min,相对湿度(70±5)%;含油率控制在0.4%,生产的五叶形涤纶POY截面形状清晰,异形度为61.4%,断裂强度2.32 cN/dtex,断裂伸长率119.4%,条干不匀率1.41%。 相似文献
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分析了1995年国内涤纶长丝、短纤的供需状况。预测了1996年及未来几年的发展趋向及需求量。指出涤纶应朝着差别化方向发展,重点开发仿毛、仿丝、异形涤纶纤维。 相似文献
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Melt-spinning of isotactic polypropylene was performed in an effort to assess how the flow field that exists within a filament affects final as-spun fiber morphology. It was concluded that the molten filament deforms chiefly by elongational flow, with some small amount of shearing flow bearing localized near the filament periphery. The resulting crystal texture is mostly comprised of lamellae oriented perpendicular (chain direction parallel) to the fiber axis, but a minority population of crystallites whose orientation is orthogonal (chain direction perpendicular) to the primary population is also present in these fibers. Post-drawing steps initially cause crystallites to rotate toward the axial direction, while the chains within them undergo intralamellar slip and become better oriented parallel to the fiber axis. At larger extensions, lamellar crystallites are pulled into microfibrillar units. 相似文献
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采用相对粘度2.85±0.03的国产高速纺有光PA6切片为原料,在普通PA6纤维生产设备基础上,改油嘴上油为双油轮上油,喷丝板直径由80 mm改为100 mm,喷丝孔为五叶形,纺丝组件压力大于等于15 MPa;纺丝温度(275±1)℃,侧吹风速度0.68 m/s,热定型温度(170±1)℃,网络空气压力(0.35±0.01) MPa。生产的233 dtex/18 f粗旦五叶形有光PA6 FDY质量优良,其断裂强度4.0 cN/dtex,断裂伸长率43.5%,条干不匀率2.13%,染色均匀度大于等于4.0级。 相似文献
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从牵伸倍率、变形温度、定型温度、加工速度、D/Y比等主要工艺参数的控制,解决了聚乳酸纤维加工困难、纤维沸水收缩率偏大的问题,得到了质量稳定的DTY。 相似文献
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采用两步法工艺路线,以PA6齐聚物、聚醚和少量交联剂为原料共聚合成聚醚酰胺热塑性弹性体(TPAE)。对TPAE进行模拟纺丝,对初生纤维进行拉伸和热定型。测定了纤维的力学性能。利用WAXD分析了交联剂对TPAE结晶性能的影响,讨论了纤维弹性及回复率与纺丝条件、交联剂用量的关系。结果表明,随交联剂含量的增加,拉伸丝较初生丝的结晶度提高幅度小,交联剂的化学交联作用明显。交联剂的引入使TPAE纤维断裂强度和弹性回复率提高,断裂伸长率降低,交联剂质量分数(相对PA6)为0.7%时,TPAE纤维的弹性回复率可提高到95%以上。 相似文献
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The effect of internal scattering on the color of dyed fabrics is calculated with the help of a highly simplified model. The predictions agree, at least qualitatively with observation. If an internally scattering fiber is ring-dyed then at lower values of the product of the coefficient of extinction and dye concentration (25–250) it is lighter than a homogenously dyed fiber but at higher values of that product it is darker. 相似文献