CN107059470A - 一种适用于在高速涂布机上生产数码热升华转印纸的涂料 - Google Patents
一种适用于在高速涂布机上生产数码热升华转印纸的涂料 Download PDFInfo
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Abstract
本发明涉及造纸领域,特别是高端用纸领域,具体提供了一种适用于在高速涂布机上生产数码热升华转印纸的涂料,该涂料以羧甲基纤维素钠或海藻酸钠、高吸水树脂和苯丙胶乳等为主要原料制备而成,可以适用于涂布速度大于500m/min的涂布机涂布的要求,从而获得高质量的数码热升华转印纸。
Description
技术领域
本发明涉及造纸领域,涉及一种适用于在高速涂布机上生产数码热升华转印纸的涂料。
背景技术
热升华转印是将人像、风景、文字等图文使用装有热升华转印墨水的喷墨打印机以镜象方式打印在热升华转印纸上,再经过热转印设备加热到200℃左右,使热升华纸上的热转印墨升华渗入到承印物,其中热升华转印纸的质量直接影响到上述过程的结果。
现在生产热升华转移印纸的涂布机速度基本在100m/min以下,按现有的涂料配方配制的涂料用在500m/min以上的高速涂布机时,由于受高速刮刀或气刀的高剪切作用,涂料的流变性质发生巨大变化,高剪切粘度急剧下降,导致涂料挂胶困难,涂布量无法满足工艺要求,而现有技术过低的涂布速度则大大限制了热升华转印纸的产量,因此如何解决这一问题成为本领域亟待解决的问题之一。
发明内容
本发明针对现有技术存在的诸多问题,提供了一种适用于在高速涂布机上生产数码热升华转印纸的涂料,该涂料以羧甲基纤维素钠或海藻酸钠、高吸水树脂和苯丙胶乳等为主要原料制备而成,可以适用于涂布速度大于500m/min的涂布机涂布的要求,从而获得高质量的数码热升华转印纸。
本发明的技术方案如下:
一种适用于在高速涂布机上生产数码热升华转印纸的涂料:其主要组分按重量份计为:
羧甲基纤维素钠或海藻酸钠20-60份,颗粒状矿物质20-50份,高吸水树脂20-50份,苯丙胶乳5-10份,消泡剂1-3份,杀菌剂1-3份,
其中所述的羧甲基纤维素钠的取代度≥0.6,海藻酸钠使用超低粘度的海藻酸钠,其2wt%水溶液在25℃时的粘度≤10cp;
所述的颗粒状矿物质选自CaCO3或凹凸棒土或滑石粉或瓷土或其混合物,且其中粒径≤50nm的部分要占65%以上;
将上述原料加入到水中,使最终获得的涂料固含量为40-65%即可;
本发明优化后使用的高吸水树脂为:以膨润土、磷酸脂淀粉、丙烯酸、丙烯酰胺等为原料生产的淀粉/膨润土复合高吸水树脂,其制备方法可按照《功能材料》2015年17期中,王瑞杰等人攥写的“淀粉/膨润土复合高吸水树脂的制备工艺研究”中的工艺方法生产制备而成。
采用这种高吸水树脂,利用其高吸水性来保证打印效率和打印质量,因热升华转印油墨大多是水性油墨,打印到纸上时需要纸有良好的吸水性来保证油墨到纸上后能快速被吸收,一是提高了干燥速度和打印速度,如果油墨长时间不干燥打印的纸页不能收卷,会粘到纸的背面;二是油墨快速被吸收后能避免两种油墨在纸页表面相互渗透影响打印质量,而上述高吸水树脂的应用则保证了最终获得的转印纸的吸水性极佳。
本发明所采用的苯丙胶乳为市场常用品种,选择时标准为玻璃化温度0-10℃,固含量40-50%即可;
所述的消泡剂选自聚硅氧烷类消泡剂,杀菌剂选自异噻唑啉酮类杀菌剂;均选自市场常规产品。
选择上述的组分和用量,主要原因如下:
1、羧甲基纤维素钠或海藻酸钠可以起到胶粘、成膜的作用,一是承载住打印到纸上的油墨不渗透到原纸中,二是保证这些油墨在高温升华时能尽量多的转移到布上;且用量不能过大,以免适得其反;
2、颗粒状矿物质能起到一定的吸附作用,同时能对整个涂料起到骨架的作用,这是提高高剪切粘度的重要成分之一;
3、高吸水树脂的主要作用是如上所述提高了纸张的吸水性,用以吸收油墨,提高纸张的油墨干燥速度和打印质量;
4、苯丙胶乳可以起到辅助胶粘剂的作用,由于本发明配方中矿物质的使用,使得必须配合使用一定量的苯丙胶乳来保证其粘附,另外苯丙胶乳与颗粒状矿物质配合使用也是抗高剪切的重要原料之一;
5、消泡剂的使用主要是减少涂料中的气泡改善涂布均一性,杀菌剂可以防止涂料发生霉变,减少细菌的滋生。
由上可知,为了适应本发明中高速涂布要求,本发明的涂料配方中一是利用了颗粒状矿物质抗高剪切能力强的特性;二是苯丙胶乳的加入配合颗粒状矿物质提高了抗高剪切能力;三是涂料的配方中固含量提高到40-65%,远高于现有技术,这是适应高速涂布要求的重要因素。
除此之外,本发明的发明人还进一步提供了该涂料的制备方法如下:
用40-60℃的温水溶解羧甲基纤维素钠或海藻酸钠,溶解后浓度为15-35wt%,同时用40-50℃的温水分散高吸水树脂,分散体的固含量控制在40-60%,颗粒状矿物质以干粉的形式加入;
具体制备时在槽罐中依次加入上述溶解后的羧甲基纤维素钠或海藻酸钠、高吸水树脂,搅拌均匀后,边搅拌边缓慢加入颗粒状矿物质,将上述三者混合均匀,混合后固含量在50%左右;再然后加入剩余的其它原料,其他原料加入时每种原料加入后搅拌不少于20分钟再加入下一种原料,以利于混合的更加均匀,同时根据其固含量调整用水量,以使得最终涂料的固含量在40-65%之间。
采用上述方法配制的涂料最终性质为:固含量40-65wt%、低剪切粘度800-1700cPs,高剪切粘度不低于30(剪切数率106),其可以适应500m/min以上的高速涂布的工艺。
综上所述,本发明所提供的这种涂料以羧甲基纤维素钠或海藻酸钠、高吸水树脂和苯丙胶乳等为主要原料制备而成,可以适用于涂布速度大于500m/min的涂布机涂布的要求,从而获得高质量的数码热升华转印纸。
具体实施方式
下面结合实施例来进一步说明本发明,可以使本领域技术人员更全面的理解本发明,但不以任何方式限制本发明。
实施例1
一种适用于在高速涂布机上生产数码热升华转印纸的涂料:其主要组分按重量份计为:
羧甲基纤维素钠或海藻酸钠20份,颗粒状矿物质20份,高吸水树脂20份,苯丙胶乳5份,消泡剂1份,杀菌剂1份,
(1)选用取代度≥0.6的羧甲基纤维素钠;
(2)所述的颗粒状矿物质选自CaCO3,且其中粒径≤50nm的部分要占65%以上;
所采用的高吸水树脂为:以膨润土、磷酸脂淀粉、丙烯酸、丙烯酰胺等为原料生产的淀粉/膨润土复合高吸水树脂,其制备方法可按照《功能材料》2015年17期中,王瑞杰等人攥写的“淀粉/膨润土复合高吸水树脂的制备工艺研究”中的工艺方法生产制备而成。
本发明所采用的苯丙胶乳为市场常用品种,如苯乙烯-丙烯酸酯乳液,选择时标准为玻璃化温度0-10℃,固含量40-50%即可;
所述的消泡剂选自聚硅氧烷类消泡剂,杀菌剂选自异噻唑啉酮类杀菌剂,均选自市场常规产品。
其制备方法如下:
(1)45℃的温水溶解羧甲基纤维素钠,溶解后浓度为30wt%;
(2)45℃的温水分散高吸水树脂,固含量控制在60wt%;
(3)上述两种原料制备好后,在10立方带有搅拌器的罐中分别泵入尚书羧甲基纤维素钠溶液4.1吨,高吸水树脂分散液2吨,混合搅拌30分钟,再缓慢加入1.2吨CaCO3,搅拌30分钟;
(4)搅拌均匀后加入0.6吨苯丙胶乳,61kg消泡剂和61kg杀菌剂,搅拌30min即可。最终获得的涂料,其性质如下:
固含量50wt%、低剪切粘度2400cPs,高剪切粘度为38(剪切数率106)
涂布效果:使用以上涂布配方制备的涂料,涂布机车速提高到1050m/min,正面(打印面)涂布量达到了8-10g/m2,涂布运行期间未出现断纸现象,生产效率达到了1400-1600吨/天,远超传统小涂布机的生产效率。成品纸指标检测情况:整个横幅涂布量均匀一致,打印测试效果良好。
实施例2:
一种适用于在高速涂布机上生产数码热升华转印纸的涂料:其主要组分按重量份计为:
海藻酸钠60份,颗粒状矿物质50份,高吸水树脂50份,苯丙胶乳10份,消泡剂3份,杀菌剂3份,
其中所述的海藻酸钠使用超低粘度的海藻酸钠(即:2%水溶液在25℃时的粘度≤10cp);
所述的颗粒状矿物质选自凹凸棒土和滑石粉的混合物,且其中粒径≤50nm的部分要占65%以上,两者用量比为1:1;
所采用的高吸水树脂为:以膨润土、磷酸脂淀粉、丙烯酸、丙烯酰胺等为原料生产的淀粉/膨润土复合高吸水树脂,其制备方法可按照《功能材料》2015年17期中,王瑞杰等人攥写的“淀粉/膨润土复合高吸水树脂的制备工艺研究”中的工艺方法生产制备而成。
本发明所采用的苯丙胶乳为苯乙烯-丙烯酸酯乳液,选择时标准为玻璃化温度0-10℃,固含量40-50%即可;
所述的消泡剂选自聚硅氧烷类消泡剂,杀菌剂选自异噻唑啉酮类杀菌剂,均选自市场常规产品。
其制备方法如下:
(1)45℃的温水溶解羧甲基纤维素钠,溶解后浓度为25wt%;
(2)45℃的温水分散高吸水树脂,固含量控制在55wt%;
(3)上述两种原料制备好后,在10立方带有搅拌器的罐中分别泵入海藻酸钠溶液4.2吨,高吸水树脂分散液1.6吨,混合搅拌25分钟,再缓慢加入0.9吨CaCO3,搅拌30分钟;
(4)搅拌均匀后加入0.34吨苯丙胶乳,53kg消泡剂和53kg杀菌剂,搅拌30min。即可。最终获得的涂料,其性质如下:
固含量42wt%、低剪切粘度2100cPs,高剪切粘度为32(剪切数率106)
涂布效果:使用以上涂布配方制备的涂料,涂布机车速提高到980m/min,正面(打印面)涂布量达到了7-8g/m2,涂布运行期间未出现断纸现象,生产效率达到了1300-1400吨/天,远超传统小涂布机的生产效率。成品纸指标检测情况:整个横幅涂布量均匀一致,打印测试效果良好。
Claims (5)
1.一种适用于在高速涂布机上生产数码热升华转印纸的涂料,其特征在于:其主要组分按重量份计为:
羧甲基纤维素钠或海藻酸钠20-60份,颗粒状矿物质20-50份,高吸水树脂20-50份,苯丙胶乳5-10份,消泡剂1-3份,杀菌剂1-3份,
其中所述的羧甲基纤维素钠的取代度≥0.6,海藻酸钠使用超低粘度的海藻酸钠,其2wt%水溶液在25℃时的粘度≤10cp;
所述的颗粒状矿物质选自CaCO3或凹凸棒土或滑石粉或瓷土或其混合物;
所采用的苯丙胶乳其玻璃化温度0-10℃,固含量40-50%。
2.根据权利要求1所述的所述的涂料,其特征在于:所述颗粒状矿物质中粒径≤50nm的部分要占65%以上。
3.根据权利要求1所述的所述的涂料,其特征在于:所述消泡剂选自聚硅氧烷类消泡剂,杀菌剂选自异噻唑啉酮类杀菌剂。
4.权利要求1所述适用于在高速涂布机上生产数码热升华转印纸的涂料的制备方法,其特征在于:
具体步骤如下:
在槽罐中依次加入溶解后的羧甲基纤维素钠或海藻酸钠和高吸水树脂,搅拌均匀后,边搅拌边缓慢加入颗粒状矿物质,将上述三者混合均匀,混合后固含量在50%;再然后加入剩余的其它原料,其他原料加入时每种原料加入后搅拌不少于20分钟再加入下一种原料,以利于混合的更加均匀,同时根据其固含量调整用水量,以使得最终涂料的固含量在40-65wt%之间。
5.根据权利要求4所述的所述的制备方法,其特征在于:用40-60℃的温水溶解羧甲基纤维素钠或海藻酸钠,溶解后浓度为15-35wt%;用40-50℃的温水分散高吸水树脂,分散体的固含量控制在40-60wt%。
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