CN105885547B - 一种醋酸纤维素酯胶片脱酸加固剂 - Google Patents
一种醋酸纤维素酯胶片脱酸加固剂 Download PDFInfo
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- CN105885547B CN105885547B CN201610422445.8A CN201610422445A CN105885547B CN 105885547 B CN105885547 B CN 105885547B CN 201610422445 A CN201610422445 A CN 201610422445A CN 105885547 B CN105885547 B CN 105885547B
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Abstract
本发明公开了一种醋酸纤维素酯胶片脱酸加固剂,该脱酸加固剂是先将粒径为20~50nm的氧化镁超声分散于乙基纤维素正丁醇溶液中,形成纳米氧化镁悬浮液,再向悬浮液中加入E51型环氧树脂及其固化剂制备而成。本发明脱酸加固剂具有良好的分散性和稳定性,其可均匀覆盖于胶片表面,有效抑制游离酸对胶片基体的自催化作用,遏制胶片进一步老化,脱酸效果显著,可操作性强,且不影响胶片记载的影像信息,对胶片的划痕还有一定的修复功能,在一定程度上提高了胶片的机械性能,对已经严重老化降解醋酸纤维素酯胶片起到加固作用,集脱酸与加固为一体,为后期胶片的数字化扫描提供了新的可能,具有很大的应用前景。
Description
技术领域
本发明属于影像档案保护与修复技术领域,具体涉及一种醋酸纤维素酯胶片脱酸加固剂。
背景技术
感光胶片诞生100多年以来,在政治、经济、教育、军事、医学、艺术乃至人们日常生活中的方方面面都发挥着重要的作用,醋酸纤维素酯胶片是使用最为广泛、馆藏较多的一类胶片档案,在美国盖蒂、罗马修复中心、中央档案馆、中国第一历史档案馆、中国第二历史档案馆、中国照片档案馆、中国电影资料馆、国家图书馆、国家博物馆等均收藏有大量的胶片档案,然而由于其自身构成材料与保存环境不良等因素的影响,出现了霉变、划伤、褪色、醋酸综合症等病害现象,其中醋酸综合症被称为醋酸纤维素酯胶片的“癌症”,表现为胶片散发出醋酸气味、表面有结晶物析出、尺寸收缩甚至扭曲变形、机械性能下降,导致胶片不能正常使用、复制及数字化,若不及时修复与保护,最终胶片乳剂层液化、脱落至胶片所记载信息完全消失。目前只是通过严格控制保存环境的条件来预防,治理方面还没有好的解决方法。醋酸综合症产生的根本原因是其片基材料三醋酸纤维素酯的水解。三醋酸纤维素酯是纤维素分子中葡糖环上的三个羟基和醋酸发生酯化反应形成羧酸酯,纤维素分子中的葡糖环相互通过苷键连接,羧酸酯和水会发生水解反应,并且在酸作为催化剂的自催化作用下,其水解反应加快,同样苷键也可以和水发生水解反应,致使醋酸纤维酯分子链发生断裂而变短。发生片基层水解反应,不仅使片基层性能显著下降,而且也引起负载于片基层的乳剂层产生许多负面影响,直接影响成像效果、甚至造成胶片自毁。因此,治理醋酸综合症的有效途径为抑制醋酸纤维素胶片降解产生醋酸气体的自催化作用。
目前对于醋酸纤维素胶片的修复保护研究主要集中在醋酸纤维素酯胶片醋酸综合症的预防、检测、机理及通过控制保存胶片温、湿度环境以延缓病害发生等方面。对于已发生醋酸综合症的醋酸纤维素胶片本体脱酸是瓶颈性难题,国内外对于醋酸纤维素酯胶片档案的脱酸材料尚未有现成的理论指导或评价。目前,适用于醋酸纤维素酯胶片档案的脱酸剂主要为无机碱,但种类繁多,且如直接使用,其脱酸过程会对胶片档案的影像信息及机械性能造成不良影响。
发明内容
本发明所要解决的技术问题在于针对醋酸纤维素酯胶片档案发生醋酸综合症的根本原因,提供一种用于预防醋酸综合症的发生及对已发生醋酸综合症的醋酸纤维素酯胶片档案进行脱酸及加固处理的集脱酸与加固为一体的脱酸加固剂。
解决上述技术问题所采用的技术方案是:该脱酸加固剂是将粒径为20~50nm的氧化镁超声分散于质量分数为5%~8%的乙基纤维素正丁醇溶液中,形成纳米氧化镁悬浮液,然后向纳米氧化镁悬浮液中加入E51型环氧树脂与其固化剂质量比为1:1的混合物,搅拌均匀即可,其中乙基纤维素正丁醇溶液、氧化镁、E51型环氧树脂与其固化剂的混合物的质量比为100:(0.8~1.5):(2~5)。
本发明的脱酸加固剂优选将粒径为20~50nm的氧化镁超声分散于质量分数为7%的乙基纤维素正丁醇溶液中,形成纳米氧化镁悬浮液,然后向纳米氧化镁悬浮液中加入E51型环氧树脂与其固化剂质量比为1:1的混合物,搅拌均匀,其中乙基纤维素正丁醇溶液、氧化镁、E51型环氧树脂与其固化剂的混合物的质量比为100:1:3。
本发明脱酸加固剂的使用方法为:用镊子夹住脱脂棉蘸取脱酸加固剂并将其均匀地涂布于经正丁醇清洗后展平的醋酸纤维素酯胶片表面上,自然干燥即可。
本发明的有益效果如下:
1、本发明采用无味、无毒、粒径小、比表面积大的纳米氧化镁为脱酸材料,与具有优良的成膜性、粘结性、耐久性性能的高分子成膜材料乙基纤维素复配,并以附着力强、低粘度、韧性高、收缩力小,具有优越的机械性能和抗化学药品及耐热性的E51型环氧树脂与其固化剂作为添加剂,经超声波振动,三者良好兼容,形成的悬浮液中纳米氧化镁用量少,脱酸效率高,且可根据胶片的酸化程度,自由调配纳米氧化镁用量,可操作性强,且在一定程度上,可填充胶片片基层的划痕,达到修复划痕作用;其中乙基纤维素不仅作为成膜剂,同时还是纳米氧化镁的良好分散剂和稳定剂,能将纳米氧化镁均匀稳定的分散在乙基纤维素溶液中,所得纳米氧化镁悬浮液具有良好的稳定性能,不易聚沉,且成膜后对降解的醋酸纤维素酯胶片有良好加固作用,添加的E51型环氧树脂与其固化剂在与脱酸加固剂很好互溶的基础上,固化后,其优良的成膜性和粘结性增加膜与胶片基体的附着力、耐热性。因此,该脱酸加固剂集脱酸与加固为一体,具有广泛的应用价值。
2、涂布本发明脱酸加固剂后,脱酸剂可均匀覆盖于胶片表面,能够有效抑制游离酸对胶片基体的自催化作用,遏制胶片进一步老化,脱酸效果显著,可操作性强,且不影响胶片记载的影像信息,对胶片的划痕还有一定的修复功能。
3、本发明脱酸加固剂能够从根本上抑制已发生醋酸综合症的醋酸纤维素胶片降解产生的醋酸气体的自催化作用,并在一定程度上提高了胶片的机械性能,对已经严重老化降解醋酸纤维素酯胶片档案起到加固作用,使胶片能够正常使用、复制及数字化,具有很重要的意义及应用价值。
附图说明
图1是超景深下未处理的胶片局部的扫描照片。
图2是超景深下采用实施例1的脱酸加固剂处理后的胶片局部的扫描照片。
图3是超景深下未处理的胶片局部划痕的扫描照片。
图4是超景深下采用实施例1的脱酸加固剂处理后的胶片局部划痕的扫描照片。
图5是未处理的胶片整体的扫描照片。
图6是采用实施例1的脱酸加固剂处理后的胶片整体的扫描照片。
图7是未涂布脱酸加固剂的片基层的水性接触角图。
图8是涂布实施例1脱酸加固剂的片基层的水性接触角图。
图9是未涂布脱酸加固剂的乳剂层的水性接触角图。
图10是涂布脱酸加固剂的乳剂层的水性接触角图。
图11是酸性环境下放置15天后未处理胶片形体变化图。
图12是酸性环境下放置15天后已处理胶片形体变化图。
图13是湿热环境下放置30天后未处理胶片乳剂层表面形貌变化图。
图14是湿热环境下放置30天后已处理胶片乳剂层表面形貌变化图。
具体实施方式
下面结合附图和实施例对本发明进一步详细说明,但本发明的保护范围不仅限于这些实施例。
实施例1
将1.0g粒径为30nm的氧化镁加入100g质量分数为7%的乙基纤维素正丁醇溶液中,超声分散30分钟,得到纳米氧化镁悬浮液,然后向纳米氧化镁悬浮液中加入3.0g E51型环氧树脂与其固化剂质量比为1:1的混合物,搅拌15分钟,得到醋酸纤维素酯胶片脱酸加固剂。
实施例2
将0.8g粒径为20nm的氧化镁加入100g质量分数为5%的乙基纤维素正丁醇溶液中,超声分散30分钟,得到纳米氧化镁悬浮液,然后向纳米氧化镁悬浮液中加入2g E51型环氧树脂与其固化剂质量比为1:1的混合物,搅拌15分钟,即得醋酸纤维素酯胶片脱酸加固剂。
实施例3
将1.5g粒径为50nm的氧化镁加入100g质量分数为8%的乙基纤维素正丁醇溶液中,超声分散30分钟,得到纳米氧化镁悬浮液,然后向纳米氧化镁悬浮液中加入5g E51型环氧树脂与其固化剂质量比为1:1的混合物,搅拌15分钟,即得醋酸纤维素酯胶片脱酸加固剂。
为了确定本发明脱酸加固剂的组成,发明人进行了大量的实验室研究试验,具体试验情况如下:
1、脱酸材料的选择
在搅拌条件下,向100g质量分数为7%的乙基纤维素正丁醇溶液中加入0.5g不同脱酸材料(Mg(OH)2、Ca(OH)2、Ba(OH)2、CaO、BaO、MgO(实验室常用)、粒径为40nm的CuO、粒径为20nm的MgO、粒径为50nm的MgO),超声分散30分钟,静置观察所得悬浮液的稳定性,并用镊子夹住脱脂棉将其均匀地涂布于经清洗、展平的醋酸纤维素酯胶片表面上,干燥后,通过测试pH、表干时间、成膜外观、附着力、硬度等因素进行筛选较适宜的脱酸材料。结果见表1~3。
表1不同脱酸材料悬浮液的稳定性
表2不同脱酸材料的成膜性能
由表1和表2中不同脱酸材料悬浮液的稳定性和成膜性能可看出,由常用的无机碱Mg(OH)2、Ca(OH)2、Ba(OH)2、CaO、BaO及MgO配制成的悬浮液的稳定性较差,静置3天的沉降高度大于3mm,15天后完全沉降,且成膜后的附着力和流平性较差,成膜外观有微量涂痕、颗粒感。而粒径为20nm的MgO因粒径小、比表面积大,可以和成膜材料兼容,悬浮液表现为良好的稳定性,且成膜后外观平整光滑,有良好的附着力及硬度。
表3不同脱酸材料的脱酸性能
根据表1和表2中不同脱酸材料悬浮液表现的稳定性和成膜性能,初步选取纳米MgO、纳米CuO作为脱酸材料,在此基础上对其脱酸性能进行了评价,其中粒径为40nm的CuO表现为较差的脱酸性能,因此,本发明选取粒径为20~50nm的MgO作为脱酸材料。
2、成膜材料的筛选
(1)实验仪器及实验材料
选择适宜的溶剂将档案保护与修复中常用的成膜材料乙基纤维素(EC)、B72(丙烯酸甲酯-甲基丙烯酸乙酯的共聚物)、F2314(偏氟乙烯和三氟氯乙烯按共聚比1:4制备的无规共聚物)、水性聚氨酯、水性环氧树脂、PEG6000溶解,各配制成100g质量分数为7%的溶液,在强烈的搅拌下分别加入1g粒径为30nm的MgO,超声分散30分钟,形成氧化镁悬浮液,用镊子夹住脱脂棉将其均匀地涂布于经清洗、展平的醋酸纤维素酯胶片表面上,干燥后,通过表干时间、成膜外观、附着力、硬度等因素进行筛选较适宜的成膜材料。结果见表4。
表4不同成膜材料的成膜性能
由表4可以看出,由材料B72、F2314和水性聚氨酯涂布于胶片表面成膜时间虽较短,但是流平性较差,有微量涂痕和颗粒感,且附着力、硬度较差,无法满足实际需要,水性环氧树脂虽然流平性好,但涂膜外观有颗粒感,附着力和硬度相对差一些,PEG6000流平性较好,但成膜外观泛白,对于影像档案来说会影响其所记载信息,且附着力、硬度较差,乙基纤维素表现为良好的流平性、附着力、硬度,成膜外观平整光滑,因此,本发明选择乙基纤维素作为成膜材料。
3、确定脱酸加固剂配比
将7g乙基纤维素加入到盛有93g正丁醇的圆底烧瓶中,搅拌回流至乙基纤维素全部溶解,停止加热回流,得到质量分数为7%的乙基纤维素正丁醇溶液,在强烈的搅拌下分别加入0.1g、0.3g、0.5g、0.8g、1.0g、1.5g粒径为30nm的MgO,超声分散30分钟,分别配制成质量分数为0.1%、0.3%、0.5%、0.8%、1%的氧化镁悬浮液,加入3g E51型环氧树脂与其固化剂质量比为1:1的混合物,搅拌均匀,用镊子夹住脱脂棉将其均匀地涂布于经清洗、展平醋酸纤维素酯胶片表面上,测定不同浓度纳米MgO对胶片pH值的影响,实验结果如表5所示。
表5不同浓度氧化镁悬浮液对胶片pH的影响
以pH值作为关键性的评价参数,对纳米氧化镁的浓度进行筛选,由表5可看出,胶卷的pH随着氧化镁浓度的增加而增加,当氧化镁的量增加为1%时,胶片的pH上升为7左右,达到很好的脱酸效果,在实际应用时,可以根据待脱酸胶片档案的pH调节氧化镁的浓度,以期达到灵活运用的效果。
为了证明本发明的有益效果,发明人对实施例1的脱酸加固剂进行了性能评价,具体试验如下:
1、成膜性能的评价
取三卷八十年代国产的醋酸纤维素酯胶片(中国电影资料馆西安电影资料库提供、已废弃)中间部分,用镊子夹住脱脂棉蘸取脱酸加固剂均匀地涂布于经清洗、展平的醋酸纤维素酯胶片的两面,自然晾干。采用VHX-600数码超景深显微镜、胶片扫描仪分别观察醋酸纤维素酯胶片上同一位置在涂膜前后的表面形貌变化。结果见图1~6。由图可见,采用本发明脱酸加固剂处理后的电影胶片表面颗粒均匀,光滑平整,所得图像清晰完整,恢复了胶片所记载图像的原貌。
2、脱酸加固剂对胶片透光性的影响
取三卷八十年代国产的醋酸纤维素酯胶片(中国电影资料馆西安电影资料库提供、已废弃)中间部分,用镊子夹住脱脂棉蘸取脱酸加固剂均匀地涂布于经清洗、展平的醋酸纤维素酯胶片的两面,自然晾干。采用X-Rite 361T台式透射式密度仪测试涂布脱酸加固剂前后胶片同一位置的光密度变化,结果见表6。
表6涂布及未涂布脱酸加固剂的胶片光密度测试结果
从表6数据可以看出,涂布本发明脱酸加固剂后,醋酸纤维素酯胶片的光密度值没有变化,说明采用本发明脱酸加固剂处理后形成的保护膜透光性很好,不会影响胶片原有光密度的变化,即不会对胶片的影像密度产生影响。
3、脱酸加固剂对胶片机械强度影响
取三卷八十年代国产的醋酸纤维素酯胶片(中国电影资料馆西安电影资料库提供、已废弃)中间部分,用镊子夹住脱脂棉蘸取脱酸加固剂均匀地涂布于经清洗、展平的醋酸纤维素酯胶片的两面,自然晾干。测试涂布脱酸加固剂前后胶片的耐折度和抗张力变化,结果见表7。
表7涂布脱酸加固剂前后胶片抗张力和耐折度的测试结果
从表7中涂布脱酸加固剂前后胶片抗张力和耐折度的测试结果可以看出,已发生醋酸综合症的醋酸纤维素酯胶片较为脆弱,其抗张力和耐折度比较低,涂布本发明脱酸加固剂后胶片的抗张力和耐折度(双折次数)都有不同程度的提高,说明本发明脱酸加固剂可以有效的提高胶片原有的机械强度,对脆弱的胶片有加固作用,增加了已发生醋酸综合症的醋酸纤维素酯胶片的放映及数字化扫描的可实施性。
4、脱酸加固剂对胶片亲水性影响
取三卷八十年代国产的醋酸纤维素酯胶片(中国电影资料馆西安电影资料库提供、已废弃)中间部分,共2组,其中一组作为空白样,不涂布脱酸加固剂,另一组用镊子夹住脱脂棉蘸取脱酸加固剂均匀地涂布于经清洗、展平的醋酸纤维素酯胶片的两面,自然晾干。采用视频接触角测定未处理胶片和采用本发明脱酸加固剂处理后的胶片放置2天后胶片乳剂层与片基层的接触角,结果见图7~10及表8。
表8涂布脱酸加固剂前后胶片接触角变化
由图7~10及表8可见,涂布本发明脱酸加固剂后,胶片乳剂层和片基层的接触角显著提高,说明涂布本发明脱酸加固剂之后,胶片的憎水性显著提高。
5、耐酸性能评价
取一卷八十年代国产的醋酸纤维素酯胶片中间部分,采用正丁醇清洗去除胶片表面析出的增塑剂晶体,并采用形体恢复试验机对其进行形体恢复。每20m取样作为试验样品,其中一组作为空白样(以下称未处理样品),另一组用镊子夹住脱脂棉蘸取脱酸加固剂均匀地涂布于经清洗、展平的醋酸纤维素酯胶片的两面,自然晾干(以下称已处理样品)。
将已处理与未处理的同一卷电影胶片样品分别置于有醋酸饱和蒸汽的规格相同的真空干燥器内,在温度20±3℃、湿度50±5%RH条件下分别贮存15天,观察样品表面形貌,并测试已处理样品与未处理样品的性能变化,结果见图11、12及表9~13。
(1)胶片表面形貌
由图11和12可见,未处理样品在醋酸环境中发生了严重的扭曲形变,胶片边缘液化卷曲,已处理样品仅发生轻微的形变,说明本发明脱酸加固剂有一定的抗扭曲变形的能力。
(2)接触角变化
表9酸老化前后胶片乳剂层的接触角变化
表10酸老化前后胶片片基层的接触角变化
由表9和10的实验数据可知,涂布本发明脱酸加固剂可以使胶片表面接触角增加,表明胶片的疏水性提高,在饱和醋酸浓度环境氛围中放置15天后,未处理样品的表面接触角减小,而已处理样品基本没有变化,因为本发明脱酸加固剂在胶片表面形成的保护膜具有优良的耐候性和成膜性,在一定程度上能缓解胶片乳剂层的降解,这与上述胶片表面形貌变化实验的结果一致,说明该保护膜对胶片有一定的保护作用。
(3)酸度变化
表11酸老化前后胶片的酸度变化测试结果
由表11可知,涂布本发明脱酸加固剂后胶片酸度大幅上升,在饱和醋酸浓度环境氛围中放置15天后,未处理样品的酸度有所降低,已处理样品的酸度变化较小,说明随着胶片酸度的增加,降低了酸化胶片的的自催化作用,减缓三醋酸纤维素酯的乙酰侧基从聚合物链上的分裂,形成醋酸的程度减弱,且未处理胶片更容易吸收周围环境中的水分发生降解或胶片乳剂层中的明胶更易发生降解变质,表明本发明脱酸加固剂在胶片表面形成的保护膜能在一定程度上保护胶片,延缓胶片酸化降解的发生。
(4)胶片机械强度变化
表12酸老化前后胶片的抗张力变化测试结果
表13酸老化前后胶片的耐折度测试结果
由表12和13可知,已发生醋酸综合症胶片经过本发明脱酸加固剂处理后,抗张力由23.1N/mm增加到37.7N/mm,说明本发明脱酸加固剂对脆弱的胶片有一定的加固作用,在饱和醋酸浓度环境氛围中放置15天后,未涂布脱酸加固剂的胶片抗张力和耐折度下降幅度较大,而涂布本发明脱酸加固剂的胶片抗张力和耐折度的下降幅度较少,因为醋酸纤维素酯片基降解过程中1,4配糖键产生断裂,称作三醋酸纤维素酯断键。未涂布脱酸加固剂的胶片酸度较低,在酸的催化下,水分子破坏了大分子的结构,与片基的乙酰基发生反应,大分子间的氢键重组,在受到外力作用后抗张强度、耐折度降低。
6、脱酸加固剂对胶片的耐久保持作用
电影胶片在长期的保存过程中,保存环境的温湿度是影响其寿命的主要因素。水汽对高分子材料具有一定的渗透能力,尤其是在热的作用下,这种渗透能力增强,能够渗透到材料体系内部并积累起来,因此,保存环境的湿度直接影响胶片中水的含量,一定条件下,胶片片基材料三醋酸纤维素酯发生水解,对电影胶片的机械强度、记载的图像以及几何尺寸构成威胁。另一方面,明胶的吸水性使银盐感光层吸收水蒸汽而膨胀,导致分散在感光层内的银粒子间相对距离发生变化,使银盐上的影像模糊。湿热老化试验是用于鉴定或研究材料在高温高湿环境下耐老化性能的重要试验方法,所以本实验采用湿热老化来评价脱酸加固剂对电影胶片的耐久保持作用。
取一卷已发生醋酸综合症八十年代国产的醋酸纤维素酯胶片中间部分,采用正丁醇清洗去除胶片表面析出的增塑剂晶体,并采用形体恢复试验机对其进行形体恢复。每20m取样作为试验样品,其中一组作为空白样(以下称未处理样品),另一组用镊子夹住脱脂棉蘸取脱酸加固剂均匀地涂布于经清洗、展平的醋酸纤维素酯胶片的两面,自然晾干(以下称已处理样品)。将已处理与未处理的同一卷电影胶片样品分别置于SDJ6025型湿热实验箱中,温度在50℃、湿度60%RH条件下老化15天、30天后,观察箱内胶卷的表明形貌变化,并测试胶片样品的性能变化,结果见图13、14及表14~18。
(1)胶片表面形貌
通过对比图13和14可以发现,未涂布脱酸加固剂的胶片乳剂层有液化现象,出现不同程度的凹坑,胶片影像层(乳剂层)所携带的信息受到损伤,可能是因为已发生醋酸综合症胶片的乳剂层有一定的降解,亲水性增加,在高湿、高温环境下,乳剂层更易吸收水分,加深胶片乳剂层中明胶的降解,而涂布本发明脱酸加固剂的胶片乳剂层的疏水性增强,阻碍水分子对明胶层的侵蚀,对影像层起到有效保护作用。
(2)胶片表面接触角变化
表14湿热老化前后胶片乳剂层的接触角变化
表15湿热老化前后胶片片基层的接触角变化
由表14和15的实验数据可知,涂布本发明脱酸加固剂可以使胶片表面接触角增加,表明胶片的疏水性提高,且随着在高温高湿环境氛围放置时间的增加,未处理样品的表面接触角逐渐减小,而已处理样品基本没有变化,因为本发明脱酸加固剂在胶片表面形成的保护膜具有优良的耐候性和成膜性,在一定程度上能缓解胶片乳剂层的降解,这与上述胶片表面形貌变化实验的结果一致,说明该保护膜对胶片有一定的保护作用。
(3)酸度变化
表16湿热老化前后胶片的酸度变化测试结果
由表16可知,涂布本发明脱酸加固剂后胶片酸度大幅上升,随着放置在湿热环境氛围中时间越长,未处理样品的酸度有所降低,已处理样品的酸度变化较小,是因为未保护胶片更容易吸收周围环境中的水分发生降解或胶片乳剂层中的明胶更易发生降解变质,表明该保护膜能在一定程度上保护胶片,延缓胶片酸化降解的发生。
(4)胶片机械强度变化
表17湿热老化前后胶片的抗张力变化测试结果
表18酸老化前后胶片的耐折度测试结果
由表17和18可见,已发生醋酸综合症胶片由于其亲水性较大,且酸度较小,随着在高温高湿环境氛围中放置时间的增加,在酸的自催化作用下,水分子更易脱去乙酰基破坏了大分子的结构,表现为抗张力和耐折度大幅度下降,而经过本发明脱酸加固剂处理后,胶片抗张力由23.1N/mm增加到37.7N/mm,说明本发明脱酸加固剂对脆弱的胶片有一定的加固作用,且由于本发明脱酸加固剂在胶片表面形成的保护膜呈碱性、疏水性,通过二者的协同作用,在一定程度上阻碍酸性胶片的自催化降解,增加胶片的耐久性。
Claims (2)
1.一种醋酸纤维素酯胶片脱酸加固剂,其特征在于:该脱酸加固剂是将粒径为20~50nm的氧化镁超声分散于质量分数为5%~8%的乙基纤维素正丁醇溶液中,形成纳米氧化镁悬浮液,然后向纳米氧化镁悬浮液中加入E51型环氧树脂与其固化剂质量比为1:1的混合物,搅拌均匀即可,其中乙基纤维素正丁醇溶液、氧化镁、E51型环氧树脂与其固化剂的混合物的质量比为100:(0.8~1.5):(2~5)。
2.根据权利要求1所述的醋酸纤维素酯胶片脱酸加固剂,其特征在于:该脱酸加固剂是将粒径为20~50nm的氧化镁超声分散于质量分数为7%的乙基纤维素正丁醇溶液中,形成纳米氧化镁悬浮液,然后向纳米氧化镁悬浮液中加入E51型环氧树脂与其固化剂质量比为1:1的混合物,搅拌均匀即可,其中乙基纤维素正丁醇溶液、氧化镁、E51型环氧树脂与其固化剂的混合物的质量比为100:1:3。
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