CN107869092B - 一种滤清器用复合滤纸及其制备方法 - Google Patents
一种滤清器用复合滤纸及其制备方法 Download PDFInfo
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- CN107869092B CN107869092B CN201711085587.0A CN201711085587A CN107869092B CN 107869092 B CN107869092 B CN 107869092B CN 201711085587 A CN201711085587 A CN 201711085587A CN 107869092 B CN107869092 B CN 107869092B
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Abstract
本发明涉及一种滤清器用复合滤纸及其制备方法,所述复合滤纸,包括容灰层、过滤层和精滤层;其中,容灰层的制备原料包括玉米生物基纤维、聚碳化二亚胺、有机柔性纤维和负电改性艾末中长纤维,过滤层的制备原料包括海藻碳纤维、乙基纤维素、三氧化二铝、十六烷基三甲基溴化铵和正电改性艾末短纤维,精滤层为表面分布有丙烯酸共聚物的无碱玻璃纤维层。本发明提供的复合滤纸具有较佳的空气透过率和容尘率,且耐水性、耐候性佳,对高温稳定,使用寿命长。
Description
技术领域
本发明涉及汽车滤清器技术领域,具体涉及一种滤清器用复合滤纸及其制备方法。
背景技术
滤清器是保证发动机耐久性和可靠性的关键部件之一。发动机有空气、机油、燃油三种滤清器,一般称做“三滤”,加上空调滤清器,俗称“四滤”,分别担负润滑系统、燃烧系统中介质、发动机进气系统、车厢空气循环系统的过滤。空气滤清器主要应用于在气动机械、内燃机械等领域,作用是为这些机械设备提供清洁的空气,以防这些机械设备在工作中吸入带有杂质颗粒的空气而增加磨蚀和损坏的机率。汽车发动机是非常精密的机件,极小的杂质都会损伤发动机。因此,空气在进入气缸之前,必须先经过空气滤清器的细密的过滤,才能进入气缸。空气滤清器是发动机的守护神,空气滤清器状态的好坏关系着发动机的寿命。
使用于汽车内燃机中的空气滤纸,是构成空气滤清器的重要组成,并决定着空气滤清器的性能。滤清器用滤纸,就是利用多微孔的滤纸介质对燃油、机油或进入发动机中的空气进行过滤,将上述介质中的颗粒悬浮物及杂质通过滤纸的表面和深层两种形式进行过滤分离出并储存其中,从而达到“滤清”的目的。目前所使用的内燃机滤清器用滤纸多为用普通木浆为主要成分制成的一种纸质的过滤层组成,所述的滤纸普遍存在固化性差、耐水性、耐候性不够的缺点,当空气湿度改变时,纸张容易产生变形,进而影响过滤效果。公开号为CN104611995 B的中国专利申请“空气过滤纸及其制备方法”以合成纤维如:涤纶纤维、玻璃纤维、聚丙烯纤维、芳纶纤维、聚乙烯醇纤维等原料作为底层和表层成分,中间分布碳纳米材料形成空气滤纸,可避免纸质滤纸耐水性、耐候性差,使用寿命短的问题,以合成纤维作为滤纸的主要原料,使制得的空气滤纸具有较好的导电、耐高温、力学性能。然而以合成纤维制得的滤纸形通常具有较高的挺拔度,折叠性较差,难以满足滤纸进一步制成滤芯的工艺要求。因此有必要提供一种新型的滤清器用复合滤纸及其制备方法以满足市场需求。
发明内容
为解决现有技术存在的问题,本发明的目的在于提供一种滤清器用复合滤纸及其制备方法,该复合滤纸具有较佳的空气透过率和容尘率,且耐水性、耐候性佳,对高温稳定,使用寿命长。
本发明的技术方案如下:
一种复合滤纸,包括容灰层、过滤层、精滤层;所述的容灰层包括以下制备原料及其重量份数:玉米生物基纤维100~200份、聚碳化二亚胺10~35份、有机柔性纤维20~40份;
所述的过滤层包括以下制备原料及其重量份数:海藻碳纤维100~200份、乙基纤维素40~80份、三氧化二铝5~30份、十六烷基三甲基溴化铵1~3份;
所述的精滤层为无碱玻璃纤维层;
所述的无碱玻璃纤维层表面分布有丙烯酸共聚物,所述的丙烯酸共聚物为聚甲基丙烯酸甲酯。
进一步地,所述的容灰层制备原料还包括负电改性艾末中长纤维100~300份。
进一步地,所述的过滤层制备原料还包括正电改性艾末短纤维100~300份。
具体地,所述的容灰层包括以下制备原料及其重量份数:玉米生物基纤维100~200份、聚碳化二亚胺10~35份、有机柔性纤维20~40份、负电改性艾末中长纤维100~300份。
所述的过滤层包括以下制备原料及其重量份数:海藻碳纤维100~200份、乙基纤维素40~80份、三氧化二铝5~30份、十六烷基三甲基溴化铵1~3份、正电改性艾末短纤维100~300份。
进一步地,所述的有机柔性纤维选自聚三亚甲基碳酸酯、聚己内酯和聚对二氧环己酮中的至少一种。
进一步地,所述的负电改性艾末中长纤维的制备步骤为:取艾末进行超微粉碎,得到艾末超微粉,分散于75%乙醇中,制成质量浓度为10%的溶液,然后按艾末:二聚酸的质量比为1:0.2的比例加入二聚酸,通过高速机械搅拌,均匀分散,然后置于压力式毛细管流变仪中在180℃,7MPa的条件下自然流出,冷却,收集长丝,将长丝分切长度为50~100μm,即得负电改性艾末中长纤维。
进一步地,所述正电改性艾末短纤维的制备步骤为:取艾末进行超微粉碎,得到艾末超微粉,分散于水中,制成质量浓度为10%的溶液,然后按艾末:聚酰胺多胺环氧氯丙烷的质量比为1:0.2的比例加入聚酰胺多胺环氧氯丙烷,通过高速机械搅拌,均匀分散,然后置于压力式毛细管流变仪中在180℃,10MPa的条件下自然流出,冷却,收集长丝,将长丝分切长度为1~10μm,即得正电改性艾末短纤维。
进一步地,所述的无碱玻璃纤维层的制备步骤为:称取直径为0.3~0.6的无碱玻璃纤维加入打浆机中匀浆分散,得浆料;将浆料除渣处理后通过湿法成型器成型得到湿纸;将湿纸浸泡于4~8%(m/v)聚甲基丙烯酸甲酯的乙酸乙酯溶液中处理2~4h,取出,100℃处理20~30min,即得。
由于本发明复合滤纸的容灰层和精滤层分别含有大量的可燃性的玉米生物基纤维、艾末纤维和玻璃纤维,为了避免复合滤纸在使用过程中由于高温发生自燃现象,本发明进一步在制得的复合滤纸上下表面还可喷涂有一层耐高温的阻燃膜,所述的阻燃膜为含碳氟聚合物膜,所述含碳氟聚合物膜可选自聚偏四氟乙烯、聚氨酯、聚砜、磺化聚酯、聚碳酸酯中的至少一种。同时,考虑到树脂层的涂覆量影响滤纸的透气率和过滤效率,优选所述的含碳氟聚合物膜的孔径为100μm以上,厚度为0.01mm以下。
此外,本发明还提供一种所述的复合滤纸的制备方法,其包括以下步骤:
(1)容灰层制备:取玉米生物基纤维、负电改性艾末中长纤维、有机柔性纤维、聚碳化二亚胺混匀后,稀释打浆所得浆料至质量浓度为0.1~0.3%,然后进行除杂,经疏解机疏解后,再磨浆,最后将浆料输送至斜网成型器成型得湿纸,干燥即得;
(2)过滤层制备:取海藻碳纤维、正电改性艾末短纤维、乙基纤维素、三氧化二铝、十六烷基三甲基溴化铵混匀后,稀释打浆所得浆料至质量浓度为0.6~1%,然后进行除杂,经疏解机疏解后,再磨浆,最后将浆料输送至斜网成型器成型得湿纸,将湿纸浸泡于流动的水中处理30~60min,干燥即得;
(3)精滤层的制备:称取直径为0.3~0.6μm的无碱玻璃纤维加入打浆机中匀浆分散,得浆料;将浆料除渣处理后通过湿法成型器成型得到湿纸;将湿纸浸泡于4~8%(m/v)聚甲基丙烯酸甲酯的乙酸乙酯溶液中处理2~4h,取出,100℃处理20~30min,即得;
(4)复合成型:分别将容灰层、过滤层、精滤层通过粘合或压制成一整体,即得复合滤纸;
(5)最后往复合滤纸上下表面喷涂一层含碳氟聚合物膜,使含碳氟聚合物膜的孔径为100μm以上,厚度为0.01mm,即得。
本发明所述的复合滤纸,按流体流动方向依次设置容灰层、过滤层和精滤层,所述的容灰层、过滤层和精滤层均为多孔性材料,所述过滤孔沿流体流动方向截面积逐渐减小,因此容灰层具有较强的纳尘容污能力,同时逐渐缩小的孔径可以保证滤纸的过滤精度。具体地,容灰层以中长度的负电改性艾末纤维、玉米生物基纤维为主要基材,有利于形成孔径较大且具有一定亲湿性的负电性滤纸,通过负电性静电吸附空气中的带正电荷的气溶胶颗粒,增加灰尘的吸纳能力,同时复配少量的有机柔性纤维,保证滤纸的力学强度。
所述的过滤层以较短的正电改性艾末纤维、带有一定孔隙率的海藻碳纤维、乙基纤维素作为基材,有利于形成孔隙率高、孔径小的正电性滤纸,进一步吸附空气中带负电性的硫化物、卤素等带负电性的离子微粒,防止这些物质对内燃机的腐蚀作用。此外,由于异性相吸作用,容灰层中的负电改性艾末中长纤维还可扎入过滤层的正电改性艾末短纤维层中,保证两纤维层之间的纤维孔不被破坏,因此相对提高了其孔隙率和容尘率。另一方面,出乎意料地,本发明人通过进一步复配少量的的十六烷基三甲基溴化铵,利用其抗静电性,调节负电性离子微粒在过滤层过度积累,凝聚成较大的粒子,堵塞孔径,进一步提高过滤效率。
所述的精滤层为无碱玻璃纤维层,具有较过滤层更为细小的孔径,通过将无碱玻璃纤维涂覆丙烯酸类共聚物,可避免空气中经过滤层过滤后遗漏更为细小的酸性物质腐蚀无碱玻璃纤维,降低滤纸的耐用性。同时为保证涂覆丙烯酸类共聚物不堵塞精滤层的滤孔,本发明人通过将制得的湿纸,置于高温下处理20~30min,使包裹在玻璃纤维表面的丙烯酸类共聚物发生熔化、收缩、呈“珍珠样”分布,使玻璃纤维本体裸露,保证精滤层过滤的精度。同时“珍珠样”分布的丙烯酸类共聚物之间形成架桥的作用,更有利于截留灰尘。
因此,本发明提供的复合滤纸孔径依流体流动方向形成了一定的梯度,在过滤时小颗粒的悬浮物或杂质进行过滤层或精滤层被储存,而大颗粒的悬浮物或杂质被截留在容灰层,从而达到分层过滤的目的,大大提高了滤清的效率。
与现有技术相比,本发明的优势在于:
(1)本发明提供的复合滤纸具有较佳的空气透过率和容尘率,且耐水性、耐候性佳,对高温稳定,使用寿命长。
(2)本发明提供的复合滤纸具有一定的机械强度,不仅满足为减小滤清器体积,增大过滤面积而对滤纸进行折褶的要求,有利于滤清器的设计安装,而且制备工艺简单,具有良好的市场应用前景。
具体实施方式
以下通过具体实施方式进一步描述本发明,但本发明不仅仅限于以下实施例。
实施例1 负电改性艾末中长纤维的制备:
取艾末进行超微粉碎,得到艾末超微粉,分散于75%乙醇中,制成质量浓度为10%的溶液,然后按艾末:二聚酸的质量比为1:0.2的比例加入二聚酸,通过高速机械搅拌,均匀分散,然后置于压力式毛细管流变仪中在180℃,7MPa的条件下自然流出,冷却,收集长丝,将长丝分切长度为60μm,即得负电改性艾末中长纤维。
实施例2 正电改性艾末短纤维的制备:
取艾末进行超微粉碎,得到艾末超微粉,分散于水中,制成质量浓度为10%的溶液,然后按艾末:聚酰胺多胺环氧氯丙烷的质量比为1:0.2的比例加入聚酰胺多胺环氧氯丙烷,通过高速机械搅拌,均匀分散,然后置于压力式毛细管流变仪中在180℃,10MPa的条件下自然流出,冷却,收集长丝,将长丝分切长度为10μm,即得正电改性艾末中长纤维。
实施例3 复合滤纸的制备
(1)容灰层制备:取玉米生物基纤维100份、负电改性艾末中长纤维100份、有机柔性纤维20份、聚碳化二亚胺10份混匀后,稀释打浆所得浆料至质量浓度为0.3%,然后进行除杂,经疏解机疏解后,再磨浆,最后将浆料输送至斜网成型器成型得湿纸,干燥即得。
(2)过滤层制备:取海藻碳纤维100份、正电改性艾末短纤维100份、乙基纤维素40份、三氧化二铝15份、十六烷基三甲基溴化铵2份混匀后,稀释打浆所得浆料至质量浓度为1%,然后进行除杂,经疏解机疏解后,再磨浆,最后将浆料输送至斜网成型器成型得湿纸,将湿纸浸泡于流动的水中处理30min,干燥即得。
(3)精滤层的制备:称取直径为0.5μm的无碱玻璃纤维加入打浆机中匀浆分散,得浆料;将浆料除渣处理后通过湿法成型器成型得到湿纸;将湿纸浸泡于4%(m/v)聚甲基丙烯酸甲酯的乙酸乙酯溶液中处理2h,取出,100℃处理25min,即得。
(4)复合成型:分别将容灰层、过滤层、精滤层通过粘合或压制成一整体,即得复合滤纸;
(5)最后往复合滤纸上下表面喷涂一层含碳氟聚合物膜,使含碳氟聚合物膜的孔径为150μm,厚度为0.01mm,即得。
实施例4 复合滤纸的制备
(1)容灰层制备:取玉米生物基纤维200份、负电改性艾末中长纤维300份、有机柔性纤维40份、聚碳化二亚胺25份混匀后,稀释打浆所得浆料至质量浓度为0.2%,然后进行除杂,经疏解机疏解后,再磨浆,最后将浆料输送至斜网成型器成型得湿纸,干燥即得。
(2)过滤层制备:取海藻碳纤维200份、正电改性艾末短纤维300份、乙基纤维素80份、三氧化二铝30份、十六烷基三甲基溴化铵3份混匀后,稀释打浆所得浆料至质量浓度为0.6%,然后进行除杂,经疏解机疏解后,再磨浆,最后将浆料输送至斜网成型器成型得湿纸,将湿纸浸泡于流动的水中处理30min,干燥即得。
(3)精滤层的制备:称取直径为0.5μm的无碱玻璃纤维加入打浆机中匀浆分散,得浆料;将浆料除渣处理后通过湿法成型器成型得到湿纸;将湿纸浸泡于6%(m/v)聚甲基丙烯酸甲酯的乙酸乙酯溶液中处理2h,取出,100℃处理25min,即得。
(4)复合成型:分别将容灰层、过滤层、精滤层通过粘合或压制成一整体,即得复合滤纸;
(5)最后往复合滤纸上下表面喷涂一层含碳氟聚合物膜,使含碳氟聚合物膜的孔径为150μm,厚度为0.01mm,即得。
对比例1 复合滤纸的制备
对比例1与实施例3的区别在于,容灰层不含负电改性艾末中长纤维、过滤层不含正电改性艾末短纤维,并相应增加玉米生物基纤维、海藻碳纤维的份数,其制备步骤为:
(1)容灰层制备:取玉米生物基纤维200份、有机柔性纤维20份、聚碳化二亚胺10份混匀后,稀释打浆所得浆料至质量浓度为0.3%,然后进行除杂,经疏解机疏解后,再磨浆,最后将浆料输送至斜网成型器成型得湿纸,干燥即得。
(2)过滤层制备:取海藻碳纤维200份、乙基纤维素40份、三氧化二铝15份、十六烷基三甲基溴化铵2份混匀后,稀释打浆所得浆料至质量浓度为1%,然后进行除杂,经疏解机疏解后,再磨浆,最后将浆料输送至斜网成型器成型得湿纸,将湿纸浸泡于流动的水中处理30min,干燥即得。
(3)精滤层的制备:称取直径为0.5μm的无碱玻璃纤维加入打浆机中匀浆分散,得浆料;将浆料除渣处理后通过湿法成型器成型得到湿纸;将湿纸浸泡于4%(m/v)聚甲基丙烯酸甲酯的乙酸乙酯溶液中处理2h,取出,100℃处理25min,即得。
(4)复合成型:分别将容灰层、过滤层、精滤层通过粘合或压制成一整体,即得复合滤纸;
(5)最后往复合滤纸上下表面喷涂一层含碳氟聚合物膜,使含碳氟聚合物膜的孔径为150μm,厚度为0.01mm,即得。
对比例2 复合滤纸的制备
对比例2与实施例3的区别在于,容灰层的负电改性艾末中长纤维替换为普通艾末中长纤维,长度为60μm,过滤层的正电改性艾末短纤维替换为普通艾末短纤维,长度为10μm,其制备步骤为:
(1)容灰层制备:取玉米生物基纤维100份、普通艾末中长纤维100份、有机柔性纤维20份、聚碳化二亚胺10份混匀后,稀释打浆所得浆料至质量浓度为0.3%,然后进行除杂,经疏解机疏解后,再磨浆,最后将浆料输送至斜网成型器成型得湿纸,干燥即得。
(2)过滤层制备:取海藻碳纤维100份、普通艾末短纤维100份、乙基纤维素40份、三氧化二铝15份、十六烷基三甲基溴化铵2份混匀后,稀释打浆所得浆料至质量浓度为1%,然后进行除杂,经疏解机疏解后,再磨浆,最后将浆料输送至斜网成型器成型得湿纸,将湿纸浸泡于流动的水中处理30min,干燥即得。
(3)精滤层的制备:称取直径为0.5μm的无碱玻璃纤维加入打浆机中匀浆分散,得浆料;将浆料除渣处理后通过湿法成型器成型得到湿纸;将湿纸浸泡于4%(m/v)聚甲基丙烯酸甲酯的乙酸乙酯溶液中处理2h,取出,100℃处理25min,即得。
(4)复合成型:分别将容灰层、过滤层、精滤层通过粘合或压制成一整体,即得复合滤纸;
(5)最后往复合滤纸上下表面喷涂一层含碳氟聚合物膜,使含碳氟聚合物膜的孔径为150μm,厚度为0.01mm,即得。
对比例3 复合滤纸的制备
对比例3与实施例3的区别在于,所述的精滤层为普通的无碱玻璃纤维层,其制备步骤为:
(1)容灰层制备:取玉米生物基纤维100份、负电改性艾末中长纤维100份、有机柔性纤维20份、聚碳化二亚胺10份混匀后,稀释打浆所得浆料至质量浓度为0.3%,然后进行除杂,经疏解机疏解后,再磨浆,最后将浆料输送至斜网成型器成型得湿纸,干燥即得。
(2)过滤层制备:取海藻碳纤维100份、正电改性艾末短纤维100份、乙基纤维素40份、三氧化二铝15份、十六烷基三甲基溴化铵2份混匀后,稀释打浆所得浆料至质量浓度为1%,然后进行除杂,经疏解机疏解后,再磨浆,最后将浆料输送至斜网成型器成型得湿纸,将湿纸浸泡于流动的水中处理30min,干燥即得。
(3)精滤层的制备:称取直径为0.5μm的无碱玻璃纤维加入打浆机中匀浆分散,得浆料;将浆料除渣处理后通过湿法成型器成型得到湿纸,干燥即得。
(4)复合成型:分别将容灰层、过滤层、精滤层通过粘合或压制成一整体,即得复合滤纸;
(5)最后往复合滤纸上下表面喷涂一层含碳氟聚合物膜,使含碳氟聚合物膜的孔径为150μm,厚度为0.01mm,即得。
对比例4 复合滤纸的制备
对比例4与实施例3的区别在于,所述的过滤层不含十六烷基三甲基溴化铵,其制备步骤为:
(1)容灰层制备:取玉米生物基纤维100份、负电改性艾末中长纤维100份、有机柔性纤维20份、聚碳化二亚胺10份混匀后,稀释打浆所得浆料至质量浓度为0.3%,然后进行除杂,经疏解机疏解后,再磨浆,最后将浆料输送至斜网成型器成型得湿纸,干燥即得。
(2)过滤层制备:取海藻碳纤维100份、正电改性艾末短纤维100份、乙基纤维素40份、三氧化二铝15份混匀后,稀释打浆所得浆料至质量浓度为1%,然后进行除杂,经疏解机疏解后,再磨浆,最后将浆料输送至斜网成型器成型得湿纸,将湿纸浸泡于流动的水中处理30min,干燥即得。
(3)精滤层的制备:称取直径为0.5μm的无碱玻璃纤维加入打浆机中匀浆分散,得浆料;将浆料除渣处理后通过湿法成型器成型得到湿纸;将湿纸浸泡于4%(m/v)聚甲基丙烯酸甲酯的乙酸乙酯溶液中处理2h,取出,100℃处理25min,即得。
(4)复合成型:分别将容灰层、过滤层、精滤层通过粘合或压制成一整体,即得复合滤纸;
(5)最后往复合滤纸上下表面喷涂一层含碳氟聚合物膜,使含碳氟聚合物膜的孔径为150μm,厚度为0.01mm,即得。
试验例一、物理参数检测
分别对实施例3-4、对比例1-3的容灰层、过滤层、精滤层的平均孔径、透气度、耐折次数进行检测,结果见下表1所示。
表1滤纸各层的物理参数检测结果
结果显示,本发明实施例3-4制得的滤纸的容灰层、过滤层和精滤层中的孔径差异较小,具有较佳的成纸透气率。由对比例1可知,容灰层和过滤层中分别缺乏负电改性艾末中长纤维和正电改性艾末短纤维,制得的容灰层和过滤层孔径差异较少,且透气度降低。由对比例2可知,容灰层和过滤层中分别含有普通的艾末中长纤维和普通的艾末短纤维,制得的容灰层和过滤层孔径均增加,但两者孔径的差异较少,降低滤纸的梯度过滤幅度,但透气度略有增加。由对比例3可知,精滤层为普通的无碱玻璃纤维层,而不是本发明制备的无碱玻璃纤维层,使精滤层的孔径增加,透气度略有增加。由对比例4可知,过滤层不含十六烷基三甲基溴化铵,对过滤层的孔径影响不大,但降低透气度。
试验例二、复合滤纸的物理性能检测
分别对本发明实施例3-4和对比例1-4制得的复合滤纸进行定量、耐破度、强度、防水、纵向挺度检测,结果见下表2所示:
表2复合滤纸各层的物理性能检测结果
结果显示,本发明实施例3-4制得的复合滤纸具有较佳的物理性能,其中耐破度和经向强力、纬向强力、纵向挺度均明显优于对比例1和2制得的复合滤纸。由对比例3和4可知,精滤层采用普通的无碱玻璃纤维层或过滤层不含十六烷基三甲基溴化铵,对复合滤纸的物理性能影响不大。
试验例三、复合滤纸的过滤性能检测
分别对本发明实施例3-4和对比例1-4制得的复合滤纸进行过滤效率、阻力、容灰量检测,结果见下表3所示:
表3复合滤纸的过滤性能检测结果
组别 | 过滤效率(%) | 阻力(Pa) | 容灰量(g/m<sup>2</sup>) |
实施例3 | 99.94 | 315 | 286 |
实施例4 | 99.96 | 310 | 290 |
对比例1 | 98.35 | 342 | 233 |
对比例2 | 96.52 | 325 | 215 |
对比例3 | 99.27 | 321 | 258 |
对比例4 | 99.04 | 334 | 242 |
结果显示,本发明实施例3-4制得的复合滤纸具有较佳的过滤性能,过滤效率可达99.9%以上,明显优于对比例1-4制得的复合滤纸。此外,由对比例1可知,容灰层和过滤层中分别缺乏负电改性艾末中长纤维和正电改性艾末短纤维,制得的复合滤纸过滤效率降低,且阻力增加。由对比例2可知,容灰层和过滤层中分别含有普通的艾末中长纤维和普通的艾末短纤维,制得的复合滤纸过滤效率明显降低,阻力略有增加。由对比例3可知,精滤层为普通的无碱玻璃纤维层,而不是本发明制备的无碱玻璃纤维层,制得的复合滤纸过滤效率略有降低,阻力略有增加。由对比例4可知,过滤层不含十六烷基三甲基溴化铵,制得的复合滤纸过滤效率降低,且阻力增加。
以上仅是本发明的优选实施方式,应当指出的是,上述优选实施方式不应视为对本发明的限制,本发明的保护范围应当以权利要求所限定的范围为准。对于本技术领域的普通技术人员来说,在不脱离本发明的精神和范围内,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。
Claims (9)
1.一种复合滤纸,其特征在于,包括容灰层、过滤层和精滤层;所述的容灰层包括以下制备原料及其重量份数:玉米生物基纤维100~200份、聚碳化二亚胺10~35份、有机柔性纤维20~40份;所述的有机柔性纤维选自聚三亚甲基碳酸酯、聚己内酯和聚对二氧环己酮中的至少一种;
所述的过滤层包括以下制备原料及其重量份数:海藻碳纤维100~200份、乙基纤维素40~80份、三氧化二铝5~30份、十六烷基三甲基溴化铵1~3份;
所述的精滤层为无碱玻璃纤维层;
所述的无碱玻璃纤维层表面分布有丙烯酸共聚物,所述的丙烯酸共聚物为聚甲基丙烯酸甲酯。
2.根据权利要求1所述的复合滤纸,其特征在于,所述的容灰层制备原料还包括负电改性艾末中长纤维100~300份。
3.根据权利要求1所述的复合滤纸,其特征在于,过滤层制备原料还包括正电改性艾末短纤维100~300份。
4.根据权利要求2或3所述的复合滤纸,其特征在于,所述的容灰层包括以下制备原料及其重量份数:玉米生物基纤维100~200份、聚碳化二亚胺10~35份、有机柔性纤维20~40份、负电改性艾末中长纤维100~300份;所述的过滤层包括以下制备原料及其重量份数:海藻碳纤维100~200份、乙基纤维素40~80份、三氧化二铝5~30份、十六烷基三甲基溴化铵1~3份、正电改性艾末短纤维100~300份。
5.根据权利要求2所述的复合滤纸,其特征在于,所述的负电改性艾末中长纤维的制备包括以下步骤:
取艾末进行超微粉碎,得到艾末超微粉,分散于75%乙醇中,制成质量浓度为10%的溶液,然后按艾末:二聚酸的质量比为1:0.2的比例加入二聚酸,通过高速机械搅拌,均匀分散,然后置于压力式毛细管流变仪中在180℃,7MPa的条件下自然流出,冷却,收集长丝,将长丝分切长度为50~100μm,即得负电改性艾末中长纤维。
6.根据权利要求3所述的复合滤纸,其特征在于,所述正电改性艾末短纤维的制备包括以下步骤:
取艾末进行超微粉碎,得到艾末超微粉,分散于水中,制成质量浓度为10%的溶液,然后按艾末:聚酰胺多胺环氧氯丙烷的质量比为1:0.2的比例加入聚酰胺多胺环氧氯丙烷,通过高速机械搅拌,均匀分散,然后置于压力式毛细管流变仪中在180℃,10MPa的条件下自然流出,冷却,收集长丝,将长丝分切长度为1~10μm,即得正电改性艾末短纤维。
7.根据权利要求1所述的复合滤纸,其特征在于,所述的复合滤纸上下表面还可喷涂有一层含碳氟聚合物膜,所述含碳氟聚合物膜可选自聚偏四氟乙烯、聚氨酯、聚砜、磺化聚酯、聚碳酸酯中的至少一种,所述的含碳氟聚合物膜的孔径为100μm以上,厚度为0.01mm以下。
8.根据权利要求1所述的复合滤纸,其特征在于,所述的无碱玻璃纤维层的制备包括以下步骤:称取直径为0.3~0.6的无碱玻璃纤维加入打浆机中匀浆分散,得浆料;将浆料除渣处理后通过湿法成型器成型得到湿纸;将湿纸浸泡于4~8%(m/v)聚甲基丙烯酸甲酯的乙酸乙酯溶液中处理2~4h,取出,100℃处理20~30min,即得。
9.根据权利要求1-8任一所述的复合滤纸的制备方法,其特征在于,包括以下步骤:
(1)容灰层制备:取玉米生物基纤维、负电改性艾末中长纤维、有机柔性纤维、聚碳化二亚胺混匀后,稀释打浆所得浆料至质量浓度为0.1~0.3%,然后进行除杂,经疏解机疏解后,再磨浆,最后将浆料输送至斜网成型器成型得湿纸,干燥即得;
(2)过滤层制备:取海藻碳纤维、正电改性艾末短纤维、乙基纤维素、三氧化二铝、十六烷基三甲基溴化铵混匀后,稀释打浆所得浆料至质量浓度为0.6~1%,然后进行除杂,经疏解机疏解后,再磨浆,最后将浆料输送至斜网成型器成型得湿纸,将湿纸浸泡于流动的水中处理30~60min,干燥即得;
(3)精滤层的制备:称取直径为0.3~0.6μm的无碱玻璃纤维加入打浆机中匀浆分散,得浆料;将浆料除渣处理后通过湿法成型器成型得到湿纸;将湿纸浸泡于4~8%(m/v)聚甲基丙烯酸甲酯的乙酸乙酯溶液中处理2~4h,取出,100℃处理20~30min,即得;
(4)复合成型:分别将容灰层、过滤层、精滤层通过粘合或压制成一整体,即得复合滤纸;
(5)最后往复合滤纸上下表面喷涂一层含碳氟聚合物膜,使含碳氟聚合物膜的孔径为100μm以上,厚度为0.01mm以下,即得。
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