丁苯胶乳用量对涂料及涂布纸性能的影响

探讨了丁苯胶乳用量对涂料及涂布纸性能的影响。结果表明:当胶乳用量增加时,涂料的低剪切黏度上升,高剪切黏度和保水值降低;涂布纸粗糙度、光泽度、油墨吸收性和花斑降低;涂布纸平滑度、印刷光泽度、干拉毛值、CIE白度和ISO白度上升。     

气相二氧化硅用于改善喷墨打印纸光泽度和油墨吸收性

探讨涂料中颜料特性对涂布纸表面性能的影响,并检测了涂层的结构。结果表明：用化学和物理两种相结合的方法分散气相二氧化硅,可以获得很好的分散效果,A200的最佳用量为34％。随着气相二氧化硅用量的增加,涂布纸的光泽度显著提高,但油墨吸收性略有下降。涂料固含量控制在25％,用两次涂布的方式可以获得高的光泽度和适宜的油墨吸收性     

滑石粉的粒度分布与其在造纸涂料上适用性的关系

用做纸张涂布白色颜料的涂料级滑石粉的粒度分布是影响其在涂料上适用性、涂布纸性能的关键性因素.滑石粉必须微细化才能用于涂料.每种滑石粉在微细化过程中均有“最佳点”.此时涂布纸具有最佳表面强度、光泽度和印刷光泽度,滑石粉浆料和涂料性能均处于适宜水平.过此最佳点再进行微细化,则涂布纸表面强度下降,光泽度、印刷光泽度也不上升,滑石粉浆料和涂料粘度上升,不仅产量、质量同时下降,且给操作带来不便。     

pH值对涂料及涂布纸性能的影响

讨论了涂料pH值对涂料及涂布纸性能的影响。结果表明,涂料pH值升高,高剪切黏度低,涂料流动性和稳定性好,涂料保水性也得到改善。涂布后涂布纸油墨吸收性下降,印刷光泽度有提高的趋势。     

纳米SiO2在涂布纸中的应用及其对涂层性能的影响

采用在面涂涂料中添加纳米SiO2改善涂布纸的耐光性能,通过分析涂布纸张的表面性能及耐光实验后的白度、光泽度、色差、表面强度、粗糙度,确定纳米材料的用量。实验表明：添加纳米SiO2对涂布纸涂层的光泽度和表面强度有一定的改善作用,纳米SiO2的用量为0．4份时,涂层耐光性能最好,白度损失为10．6％,表面强度损失15．9％,而空白试样的白度损失为17．1％,表面强度损失16．7％。     

豆酪素在涂布纸涂料中的应用

研究了涂料配方中豆酪素替代部分羧基丁苯胶乳对铜版纸涂料性能及其成纸指标的影响。结果显示:豆酪素按1∶2的比例替代部分丁苯胶乳后,涂料黏度上升,可以降低增稠剂用量,有利于降低成本;同时涂料保水效果有所改善,有利于上机使用。豆酪素的使用能改善涂布纸的光泽度、油墨吸收性和印刷性能,但豆酪素对涂布纸IGT表面强度有不利影响,当豆酪素用量为2份时,涂布纸IGT表面强度降低了约20%。综合分析,在保证涂布纸主要指标的前提下,豆酪素用量最多为1.5份。     

羟乙基醚化淀粉在LWC涂布纸中的应用探讨

通过实验室在相同涂料中加入羟乙基醚化淀粉替代部分丁苯胶乳,探讨对LWc涂布纸的物理性能的影响以及对涂布纸成本进行分析。结果表明：在Lwc涂布纸涂料方案5中,4份羟乙基醚化淀粉可以替代5份丁苯胶乳,表现出较为理想的物理性能。涂料配方中还相应减少了羧甲基纤维素（CMC）的用量,明显降低了LWC涂布纸的生产成本。     

聚乳酸接枝马来酸酐/淀粉共混物对涂料流变性及纸张性能的影响

将聚乳酸接枝马来酸酐与淀粉共混物作为胶黏剂用于造纸涂料中,研究了改性聚乳酸不同用量对涂料流变性以及对涂布纸白度、表面强度、油墨吸收性能的影响;同时与涂料中常用的合成胶乳丁苯胶乳作比较。结果发现:改性聚乳酸用量的增加可以显著降低涂料低剪切黏度和高剪切黏度,改善涂料流变性;同时,随着改性聚乳酸用量增加,涂布纸白度、表面强度和油墨吸收性提高;另外,改性聚乳酸/淀粉共混物作为胶黏剂使用与丁苯胶乳对涂布纸性能影响相差不大,可替代丁苯胶乳或与之配合使用,获得更好的涂布纸性能。     

颜料性能对涂布纸宏观、微观光泽度及光泽度均一性的影响

光泽度是造纸工作者非常关注的问题之一,因为它对涂布纸视觉效果和印刷性能具有很强的影响.对于高质量涂布纸来说,除要求较高的平均光泽度外,光泽度的均匀性也是至关重要的.在实际应用中,通常采用强压光的方式获取较高的纸页光泽度.但这除导致松厚度下降外,还会使涂布纸光泽度的变化显著增加.这是因为光泽度不单单和平均平滑度有关,它还受涂布纸表面微细结构或局部形态的影响.本研究采用一种新开发的微观光泽度仪,研究涂料的不同性能包括颜料类型、粒子大小、尺寸分布及压光条件等对纸页宏观、微观光泽度的影响.根据实验结果界定并确认了控制光泽度及光泽度均匀性的表面结构参数.     

涂布纸油墨吸收牲的影响因素

探讨了颜料涂布纸油墨吸收性的影响因素。结果表明,在一定范围内,胶乳用量增加,涂层表面孔隙率减小,油墨吸收性降低;配用一定比例的淀粉后,油墨吸收性明显提高,涂布纸平滑度和光学性能有所降低;研磨碳酸钙配比增加,涂层孔隙率增加,油墨吸收性提高。涂料pH值升高,油墨吸收性略有提高,但对印刷光泽度影响不大。干燥时温度迅速升高会引起油墨吸收性的增加;红外干燥对油墨吸收性的影响较电热板干燥缓和。     

不同流变助剂对涂布白纸板物理性能的影响

流变助剂不仅能改变涂料的流变性能,最终也将影响到涂布纸的物理性能.在工厂白纸板涂料配方的基础上,分析了羧甲基纤维素(CMC)对底涂层的影响,并对比了面涂层中流变助剂CMC和丙烯酸碱溶乳液的不同加入量对最终涂层性能的影响.相比于CMC,丙烯酸碱溶乳液更能提高涂层的平滑度、光泽度和拉毛强度以及改善白度,同时油墨吸收值也要高一些.     

涂布箱纸板的光学性能与印刷适性

研究了重质碳酸钙(GCC)、高岭土及它们不同比例混合使用和淀粉对涂布箱纸板白度、表面强度和印刷光泽度的影响.结果表明,涂布箱纸板的白度不仅依赖于颜料自身的白度,而且取决于原纸的白度,在褐色箱纸板上涂布时,全高岭土预涂的箱纸板白度高于全GCC预涂的.涂布箱纸板的表面强度和印刷光泽度均随着面涂层中GCC含量的增加而降低.在涂料中加入荧光增白剂(OBA)和淀粉可显著提高涂布箱纸板的白度,淀粉的加入也可提高涂布箱纸板的表面强度,但淀粉对印刷光泽度几乎没有影响.     

刷光整饰对涂布纸和纸板性能的影响

刷光整饰可以改变涂布纸和纸板的外观和物理性能,明显提高表面光泽度,不增加紧度,有利于低定量纸的不透明度和纸板的挺度。     

高功能化羧基丁苯胶乳在涂布白纸板中的应用

研究了高功能化羧基丁苯胶乳在涂布白纸板面涂中的应用情况。实验结果表明,高功能化羧基丁苯胶乳具有优良的机械和化学稳定性,配制的涂布白纸板面涂涂料性能稳定,保水性能好,高剪切条件下表观黏度较低。扫描电镜显示,涂层表面微观粗糙度较大,但表面致密性好,孔隙少,透气度低,表面印刷强度高,印刷光泽度好;而纸页光泽度、油墨吸收性及挺度能维持在质量标准要求的范围之内。     

Preparation of Ultrafine Starch Particle and its Application in Paper Coating

Despite its biodegradability, adequate cohesive strength and comparatively low cost, the use of cooked starch as a paper coating binder is limited due to its high viscosity and serious negative impact on the gloss. Starch-based bio-latex with size in the nanometer or sub-micrometer range has been developed recently to overcome these shortcomings. In this study, ultrafine starch particle (UFSP) was prepared by mechanical milling using a DYNO mill in combination with light chemical pretreatment. Model coating colors containing different dosages of UFSP were applied to base paper and the properties of the coated papers were evaluated. The results showed that the UFSP was disc-shaped with a median particle diameter of 167 nm. Water retention capacity of the coating colors was improved considerably with the addition of UFSP, i.e., the water retention value decreased by nearly 40% when styrene-butadiene latex was replaced by UFSP at a dosage of 3 pph (per hundred parts of pigment). The high shear rate viscosities of the coating colors containing no more than 2 pph of USFP were similar to that of the control coating color at shear strain rate higher than 2000 s1. The properties and performances of the coated papers were comparable to the control coated paper with single synthesized latex binder. The gloss and the print gloss of paper samples with or without USFP were 59.7% and 58.2%, 79.0% and 78.8%, respectively. Surface strength of paper samples with or without USFP were 0.96 and 0.90 m/s, respectively, while the ink absorptivity values were 34% and 33%. This study demonstrates a promising approach to obtain sub-micrometer sized starch for paper coating.     

涂料保水剂特性与涂布纸性能

研究了纸张涂料保水剂--聚甘糖衍生物(简称GPE)和羧甲基纤维素(CMC)对涂料粘度、保水性、流变性及其涂布纸板性能的影响.研究结果表明,尽管GPE用量仅为CMC的1/10(质量分数),但添加GPE较添加CMC制得的涂布纸板在涂布量相同或略低的情况下,其涂布纸的白度增加、表面粗糙度下降、适印性提高,其原因并非是GPE提高了涂料的保水性,而是改善了涂料在高剪切力作用下的触变性.     

沉淀碳酸钙在铜版纸中的应用

介绍了沉淀碳酸钙（PCC）在铜版纸生产中作为填料及涂布颜料的应用与特性，重点介绍了涂布级PCC对铜版纸光学性能、印刷性能等方面所带来的影响，并展望了其在涂布加工纸中的应用前景。与研磨碳酸钙（GCC）相比，涂布级PCC能全面改善纸张的光学性能如白度、光泽度、不透明度等，并提高纸面的平滑性能，同时其高松厚的涂层结构及高的孔隙率所带来的快速吸收性能，将对其的最终使用产生重大影响。     

Improving the oxidative stability of sunflower seed kernels by edible biopolymeric coatings loaded with rosemary extract

An optimized combination of whey protein concentrate (WPC), glycerol and carboxymethyl cellulose (CMC) was determined by evaluating the mechanical properties of edible films and coating percentage on sunflower seed kernels (SUKs). The optimal coating solutions with/without rosemary extract (RAE) were used to improve oxidative stability of SUKs. Moreover, the efficiency of the coated SUKs was assessed in a sesame-based product, as a food system. The optimized composite coating (CMC 0.6% and WPC 8% by total solution weight, and glycerol 51% by WPC weight) provided the better color features for SUKs stored at elevated temperature compared to WPC coatings (10 and 11%, w/w) with a Maillard-induced red color, and it was more effective than CMC (4%, w/w) coating to improve the oxidative stability of the nuts. The RAE had a positive effect on the color characteristics of the composite and CMC coatings; however, it enhanced the oxidation of SUKs, which could be due to disruption of coating polymer network, and thus increasing the oxygen diffusion into the product. The food system containing the coated nuts exhibited a lower oxidation extent in comparison to the control formulation prepared by uncoated ones. Therefore, using an optimal composite coating, reddening of WPC at high temperatures and less oxidation protection efficiency of CMC were resolved as the kernels with desirable color and oxidative stability properties were produced, applicable in the formulation of products needing thermal processing.     

研磨碳酸钙用于涂布纸的研究

介绍了研磨碳酸钙涂料的性质,实验通过调整GCC的不同比例,研究了涂料的性质和涂布纸性质的变化,总结了GCC涂料的优缺点,通过提高涂料的固含量可以克服GCC的缺点,达到最大限度地提高GCC配比的目的。