CN111778767A - 一种环保型纸张增硬涂层材料及其制备方法 - Google Patents
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Abstract
本发明公开了一种环保型纸张增硬涂层材料，解决纸品印刷工业过程由于纸张太薄或是部分经矿物质改性纸品密度较大而存在的纸张硬挺度不足，造成印刷、折版、成型等工艺过程纸张的上机性较差，生产效率低的问题。本发明配方采用聚氨酯预聚物和羟烷基纤维素盐组合原材料，聚氨酯预聚物玻璃化温度Tg在50℃～80℃范围，游离异氰酸酯单体含量小于0.05％，聚氨酯预聚物与羟烷基纤维素盐的质量比在1∶0.05～1∶20的范围，采用去离子水分散体系，分散浓度在45％～85％范围，分散状态为粘稠状，25℃下的黏度为65000±5000mPaS。本发明涂层成膜韧性好，硬度高，提高纸张硬挺度，改善纸张上机性，提高生产效率，并且涂层材料可调节光亮效果，可代替亮光油或哑光油直接在线使用。
Description
技术领域
本发明涉及涂层材料技术领域，尤其是涉及一种环保型纸张增硬涂层材料。
背景技术
在纸品印刷工业，由于纸张太薄或是部分经矿物质改性纸品密度较大而存在的纸张硬挺度不足，造成印刷、折版、成型等工艺过程纸张的上机性较差，生产效率低。比如，用于印刷制造环保购物袋、文件封及资料册的防水环保塑料纸，这类塑料纸一般是由可降解高分子材料和矿物质填料组成，具有优越的防水性能。但是由于填充了大量矿物质填料，纸张自身密度大，硬挺度不足，造成印刷、折版、成型等工艺过程纸张的上机性较差，生产效率低。
发明内容
本发明要解决纸品印刷工业中，由于纸张太薄或是部分经矿物质改性纸品密度较大而存在的纸张硬挺度不足的问题。
本发明解决上述问题的目的是提供一种环保型纸张增硬涂层材料。涂层成膜韧性好，硬度高，提高纸张硬挺度，改善纸张上机性，提高生产效率，并且涂层材料可调节光亮效果，可代替亮光油或哑光油直接在线使用，同时改善生产环境的职业卫生状况。
本发明的技术方案①是：
环保型纸张增硬涂层材料配方采用聚氨酯预聚物和羟烷基纤维素盐组合原材料，所述聚氨酯预聚物由聚醚二元醇、聚己内酯二元醇、聚四氢呋喃二元醇中的一种或多种与二苯基甲烷二异氰酸酯(MDI)、二环己基甲烷二异氰酸酯(HMDI)、六亚甲基二异氰酸酯(HDI)中的一种或多种预聚获得，二元醇与二异氰酸酯的摩尔比f＝n-OH(低聚物二元醇组合的羟基摩尔总数)/n-NCO(二异氰酸组合的异氰酸基摩尔总数)＝0.45～0.50、二元醇与二异氰酸酯充分反应所获得的聚氨酯预聚物链段结构具有互补多样性特征，成膜涂层的玻璃化温度Tg在50℃～80℃范围，游离异氰酸酯单体含量小于0.05％；所述羟烷基纤维素盐为钠盐、钾盐或鞍盐中的一种。聚氨酯预聚物与羟烷基纤维素盐的质量比在1/0.05～1/20的范围。
本发明的技术方案②是：
聚氨酯预聚物与羟烷基纤维素盐按一定比例分散在去离子水中，分散浓度在45％～85％范围，分散状态为粘稠状，25℃下的黏度为65000±5000mPaS。具体包含以下工艺步骤①聚氨酯预聚物合成，②聚氨酯预聚物和羟烷基纤维素盐按质量比高速分散在去离子水中，③调整黏度在65000±5000mPaS(25℃)范围，④用过滤网加压过滤包装。
具体实施方式
实施例1：
环保型纸张增硬涂层材料配方采用聚氨酯预聚物和羟烷基纤维素盐组合原材料，聚氨酯预聚物由聚醚二元醇PPG6000、聚己内酯二元醇PCL4000和聚四氢呋喃二元醇PTMG4000按质量比为1.75/0.68/1的比例与二苯基甲烷二异氰酸酯 (MDI)预聚获得，二元醇与二异氰酸酯的摩尔比f＝n-OH(低聚物二元醇组合的羟基摩尔总数)/n-NCO(二异氰酸组合的异氰酸基摩尔总数)＝0.48，二元醇与二异氰酸酯充分反应所获得的聚氨酯预聚物链段结构具有互补多样性特征，成膜涂层的玻璃化温度Tg为66℃范围，游离异氰酸酯单体含量小于0.05％；羟烷基纤维素盐为钠盐。聚氨酯预聚物与羟烷基纤维素盐的质量比在1/0.18。
聚氨酯预聚物与羟烷基纤维素钠按1/0.18质量比分散在去离子水中，分散浓度在55％，分散状态为粘稠状，25℃下的黏度为63000mPaS。具体包含以下工艺步骤①聚氨酯预聚物合成，②聚氨酯预聚物和羟烷基纤维素钠按质量比高速分散在去离子水中，③调整黏度在63000mPaS(25℃)范围，④用过滤网加压过滤包装。
本实施例制备的环保型纸张增硬涂层材料的成膜涂层性能及其对防水环保塑料纸的硬挺度提升率如下表。
| 铅笔硬度 | H |
| 拉伸强度 | 12.5MPa |
| 断裂伸长率 | 450％ |
| 对防水环保塑料纸的硬挺度提升率 | 58％ |
实施例2：
环保型纸张增硬涂层材料配方采用聚氨酯预聚物和羟烷基纤维素盐组合原材料，聚氨酯预聚物由聚醚二元醇PPG8000和聚四氢呋喃二元醇PTMG4000按质量比为1.95/1的比例与二环己基甲烷二异氰酸酯(HMDI)预聚获得，二元醇与二异氰酸酯的摩尔比f＝n-OH(低聚物二元醇组合的羟基摩尔总数)/n-NcO(二异氰酸组合的异氰酸基摩尔总数)＝0.49，二元醇与二异氰酸酯充分反应所获得的聚氨酯预聚物链段结构具有互补多样性特征，成膜涂层的玻璃化温度Tg为58℃范围，游离异氰酸酯单体含量小于0.05％；羟烷基纤维素盐为钠盐。聚氨酯预聚物与羟烷基纤维素盐的质量比在1/0.15。
聚氨酯预聚物与羟烷基纤维素钠按1/0.15质量比分散在去离子水中，分散浓度在65％，分散状态为粘稠状，25℃下的黏度为68000mPaS。具体包含以下工艺步骤①聚氨酯预聚物合成，②聚氨酯预聚物和羟烷基纤维素钠按质量比高速分散在去离子水中，③调整黏度在68000mPaS(25℃)范围，④用过滤网加压过滤包装。
本实施例制备的环保型纸张增硬涂层材料的成膜涂层性能及其对防水环保塑料纸的硬挺度提升率如下表。
| 铅笔硬度 | H |
| 拉伸强度 | 10.8MPa |
| 断裂伸长率 | 550％ |
| 对防水环保塑料纸的硬挺度提升率 | 46％ |
上述具体实施例不用于限定本发明的保护范围，凡是依照本发明的技术特征所做的等效变换而形成的实施例均属于本发明权利要求所涵盖的保护范围。
Claims (4)
1.一种环保型纸张增硬涂层材料，其特征在于：环保型纸张增硬涂层材料配方采用聚氨酯预聚物和羟烷基纤维素盐组合原材料，所述聚氨酯预聚物由聚醚二元醇、聚己内酯二元醇、聚四氢呋喃二元醇中的一种或多种与二苯基甲烷二异氰酸酯(MDI)、二环己基甲烷二异氰酸酯(HMDI)、六亚甲基二异氰酸酯(HDI)中的一种或多种预聚获得，二元醇与二异氰酸酯的摩尔比f＝n-OH(低聚物二元醇组合的羟基摩尔总数)/n-NCO(二异氰酸组合的异氰酸基摩尔总数)＝0.45～0.50、二元醇与二异氰酸酯充分反应所获得的聚氨酯预聚物链段结构具有互补多样性特征，成膜涂层的玻璃化温度Tg在50℃～80℃范围，游离异氰酸酯单体含量小于0.05％；所述羟烷基纤维素盐为钠盐、钾盐或鞍盐中的一种。
2.根据权利要求1所述一种环保型纸张增硬涂层材料，其特征在于：聚氨酯预聚物与羟烷基纤维素盐的质量比在1/0.05～1/20的范围。
3.根据权利要求1和2所述一种环保型纸张增硬涂层材料，其特征在于：聚氨酯预聚物与羟烷基纤维素盐按一定比例分散在去离子水中，分散浓度在45％～85％范围，分散状态为粘稠状，25℃下的黏度为65000±5000mPaS。
4.根据权利要求1、2和3所述一种环保型纸张增硬涂层材料，其特征在于：包含以下工艺步骤①聚氨酯预聚物合成，②聚氨酯预聚物和羟烷基纤维素盐按质量比高速分散在去离子水中，③调整黏度在65000±5000mPaS(25℃)范围，④用过滤网加压过滤包装。
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