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CN108570886A - 在纸膜表面生成胶膜的纸浆模塑包装材料 - Google Patents

在纸膜表面生成胶膜的纸浆模塑包装材料 Download PDF

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CN108570886A
CN108570886A CN201810404922.7A CN201810404922A CN108570886A CN 108570886 A CN108570886 A CN 108570886A CN 201810404922 A CN201810404922 A CN 201810404922A CN 108570886 A CN108570886 A CN 108570886A
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packaging material
paper pulp
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Changzhou Love Education Science And Technology Co Ltd
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Abstract

本发明公开了在纸膜表面生成胶膜的纸浆模塑包装材料，属于包装材料的技术领域。本发明先将废弃单面瓦楞纸板浸泡在去离子水中，破碎打浆后洗涤除杂并加入到去离子水中制成纸浆悬浮液，随后以石膏粉为原料，掺杂氯化铝制得复合石膏晶须，再将玉米淀粉糊化后与司盘80、吐温60等复配成复合乳化剂，并与阳离子聚丙烯酰胺、聚乙烯醇改性松香，最后将纸浆悬浮液、复合石膏晶须和改性松香胶混合，滤水成型后脱模，再经热压整形即可得纸浆模塑包装材料，本发明所得的纸浆模塑通过复合石膏晶须与改性松香胶在纸膜表面生成的胶膜，降低了湿坯的含水率，提高了湿坯的结构强度，解决了在脱模的过程中容易发生撕裂现象，提高了成品率。

Description

在纸膜表面生成胶膜的纸浆模塑包装材料
技术领域
本发明属于包装材料的技术领域，具体涉及一种在纸膜表面生成胶膜的纸浆模塑包装材料。
背景技术
纸浆模塑包装制品是一种绿色环保、节能的新型包装材料，主要由可降解的蔗渣、废纸等制成，其能够减少森林资源的消耗，具有环保可降解、对环境污染小、物美价廉的优点，目前已广泛应用于电子通信、家具、农副产品、玩具等行业包装。
“纸浆模塑”是以纸浆为原料，用带滤网的模具，在压力、时间等条件下，使纸浆脱水、纤维成形而生产出所需产品的加工方法。纸浆模塑包装制品是由一定浓度的纸浆通过模具在负压作用下吸附成型，使得纸浆纤维均匀分布在模具表面，从而形成具有拟定几何形状与尺寸的湿纸模坯，再进一步经过脱水脱模，干燥整形而成，在纸浆模塑制品生产脱模的过程中，由于湿纸模坯尚未干燥成型，因此其结构强度较低，在脱模的过程中容易导致撕裂现象的出现，为了解决上述问题实现顺利脱模，现有纸浆模塑包装制品必须形成一端大另一端小的锥型结构，这样的产品成型后必然存在斜度，在其装箱后将会出现一空虚的空间，严重影响被包装产品边角部位的保护，必须通过增大包装体积来获得相应的保护性能，不能满足现在缩减包装体积、降低包装运输成本的趋势要求。因此，开发一种能够有效增强产品边角部位的保护能力，大幅度提高产品保护性能，且可节省包装空间的产品势在必行。
发明内容
本发明所要解决的技术问题：针对目前使用的纸浆模塑湿坯的含水率高，导致湿坯的结构强度较低，在脱模过程中容易发生撕裂现象的问题，提供了一种纸浆模塑包装材料的方法。
为解决上述技术问题，本发明采用如下所述的技术方案：
（1）取废弃单面瓦楞纸板，剪切、浸泡、打浆后过滤，得滤渣，将滤渣水洗3~5次后加入去离子水中，制成纸浆悬浮液；
（2）取石膏、乙二醇溶液、氯化镁、氯化铝装入反应釜中，密封后加热至120~150℃反应2~3h，过滤得滤饼，将滤饼水洗干燥后得掺镁铝石膏晶须；
（3）按固液比1：20~1：30g/mL将玉米淀粉与去离子水混合，在80~90℃下糊化30~40min，再加入乳化剂，在70~75℃下搅拌10~20min，得改性淀粉乳化剂，再取松香加热融化后与改性淀粉乳化剂混合，再加入助留剂，搅拌20~30min后得改性松香胶；
（4）将掺镁铝石膏晶须，改性松香胶，加入纸浆悬浮液中混合均匀，再经纸浆模塑成型机滤水、挤压成型后脱模、干燥、热压整形得纸浆模塑包装材料。
步骤（1）所述的纸浆悬浮液的固含量为8~10%。
步骤（2）所述的掺镁铝石膏晶须由下述重量份原料制得：20~30份石膏，400~600份质量分数为80%乙二醇溶液，1.0~1.5份氯化镁，0.2~0.3份氯化铝。
步骤（3）所述的乳化剂为吐温-60，吐温-80，司盘-60，司盘-80中的一种或多种，用量为玉米淀粉质量。
步骤（3）所述的松香用量为玉米淀粉质量的5~6倍，在140~150℃下加热融化。
步骤（3）所述的助留剂为阳离子聚丙烯酰胺、聚乙烯醇、聚乙烯亚胺中的一种或两种，使用量为玉米淀粉质量的4~10%。
步骤（4）所述的掺镁铝石膏晶须为纸浆悬浮液质量的0.03~0.10%，改性松香胶为纸浆悬浮液质量的0.005~0.015%。
步骤（4）中纸浆滤水至含水率为70～75%，再在10～20MPa压力下挤压成型后脱模，得纸浆模塑湿坯，再将纸浆模塑湿坯置于干燥箱中，在80～90℃下干燥2～3h后，转入平板硫化机中，在120～150℃下，以4～5MPa热压整形3～5min。
本发明的有益技术效果是：本发明将废弃单面瓦楞纸板浸泡在去离子水中，破碎打浆后洗涤除杂并加入到去离子水中制成纸浆悬浮液，随后以石膏粉为原料，掺杂氯化镁铝制得石膏晶须，再将玉米淀粉糊化后与乳化剂等复配成复合乳化剂，并与助留剂改性松香，最后将纸浆悬浮液、掺镁铝石膏晶须和改性松香胶混合，滤水成型后脱模，再经热压整形即可得纸浆模塑包装材料，本发明所得的纸浆模塑通过掺镁铝石膏晶须和改性松香胶增加纸浆中细小纤维的留着性能，附着在长纤维表面，从而改善成型的纸模制品表面光滑度和匀度，同时在纸膜表面生成胶膜，降低了湿坯的含水率，提高了湿坯的结构强度，抗张强度可达10～15kN/m，伸长率可达15～20%，变形量可达3～8mm，承重量可达120～150kg，解决了在脱模的过程中容易发生撕裂现象，提高了成品率。
具体实施方式
为便于理解本发明，本发明列举实施例如下。本领域技术人员应该明了，所述实施例仅仅是帮助理解本发明，不应视为对本发明的具体限制。
称取200～300g废弃单面瓦楞纸板，将其剪切成20mm×20mm的碎片，并浸泡在2～3L去离子水中5～6h，再转入碎浆机中破碎打浆至打浆度为25°SR，随后过滤得滤渣，用去离子水洗涤滤渣3～5次后，将滤渣加入20～30L去离子水中，以500～600r/min搅拌1～2h，得纸浆悬浮液；称取20～30g石膏装入研钵中研磨20～30min，再将研磨后的石膏粉与400～600mL质量分数为80%乙二醇水溶液混合后装入高压反应器中，再加入1.0～1.5g氯化镁，0.2～0.3g氯化铝以200～300r/min搅拌15～20min，随后将高压反应器密封后加热至120～140℃反应2～3h，自然冷却至室温后过滤得滤饼，并用去离子水洗涤滤饼至洗涤液呈中性，再将滤饼置于干燥箱中，在50～60℃下干燥至恒重，得掺镁铝石膏晶须；称取4～5g玉米淀粉加入80～100mL去离子水中，在80～90℃恒温水浴下，以300～400r/min搅拌糊化30～40min，再加入2.0～2.5g司盘80，2.0～2.5g吐温60，在70～75℃恒温水浴下，以300～400r/min搅拌10～20min，得改性淀粉乳化剂；称取20～25g松香，加热至140～150℃，使松香完全融化，再以500～600r/min搅拌并以1～2mL/min滴加改性淀粉乳化剂，滴加完毕后加入60～70mL沸水中，以800～1000r/min继续搅拌10～15min，随后加入0.1～0.2g阳离子聚丙烯酰胺，0.1～0.2g聚乙烯醇，以500～600r/min搅拌20～30min，冷却至室温后，得改性松香胶；向制备的纸浆悬浮液中加入10～15g制备的掺镁铝石膏晶须，2～3g改性松香胶，以200～300r/min搅拌30～40min，随后转入纸浆模塑成型机中的模具中滤水至含水率为70～75%，再以10～20MPa压力下挤压成型后脱模，得纸浆模塑湿坯，再将纸浆模塑湿坯置于干燥箱中，在80～90℃下干燥2～3h后，转入平板硫化机中，在120～150℃下，以4～5MPa热压整形3～5min，得纸浆模塑包装材料。
实例1
称取200g废弃单面瓦楞纸板，将其剪切成20mm×20mm的碎片，并浸泡在2L去离子水中5h，再转入碎浆机中破碎打浆至打浆度为25°SR，随后过滤得滤渣，用去离子水洗涤滤渣3次后，将滤渣加入20L去离子水中，以500r/min搅拌1h，得纸浆悬浮液；称取20g石膏装入研钵中研磨20min，再将研磨后的石膏粉与400mL质量分数为80%乙二醇水溶液混合后装入高压反应器中，再加入1.0g氯化镁，0.2g氯化铝以200r/min搅拌15min，随后将高压反应器密封后加热至120℃反应2h，自然冷却至室温后过滤得滤饼，并用去离子水洗涤滤饼至洗涤液呈中性，再将滤饼置于干燥箱中，在50℃下干燥至恒重，得掺镁铝石膏晶须；称取4g玉米淀粉加入80mL去离子水中，在80℃恒温水浴下，以300r/min搅拌糊化30min，再加入2.0g司盘80，2.0g吐温60，在70℃恒温水浴下，以300r/min搅拌10min，得改性淀粉乳化剂；称取20g松香，加热至140℃，使松香完全融化，再以500r/min搅拌并以1mL/min滴加改性淀粉乳化剂，滴加完毕后加入60mL沸水中，以800r/min继续搅拌10min，随后加入0.1g阳离子聚丙烯酰胺，0.1g聚乙烯醇，以500r/min搅拌20min，冷却至室温后，得改性松香胶；向制备的纸浆悬浮液中加入10g制备的掺镁铝石膏晶须，2g改性松香胶，以200r/min搅拌30min，随后转入纸浆模塑成型机中的模具中滤水至含水率为70%，再以10MPa压力下挤压成型后脱模，得纸浆模塑湿坯，再将纸浆模塑湿坯置于干燥箱中，在80℃下干燥2h后，转入平板硫化机中，在120℃下，以4MPa热压整形3min，得纸浆模塑包装材料。
实例2
称取300g废弃单面瓦楞纸板，将其剪切成20mm×20mm的碎片，并浸泡在3L去离子水中6h，再转入碎浆机中破碎打浆至打浆度为25°SR，随后过滤得滤渣，用去离子水洗涤滤渣5次后，将滤渣加入30L去离子水中，以600r/min搅拌2h，得纸浆悬浮液；称取30g石膏装入研钵中研磨30min，再将研磨后的石膏粉与600mL质量分数为80%乙二醇水溶液混合后装入高压反应器中，再加入1.5g氯化镁，0.3g氯化铝以300r/min搅拌20min，随后将高压反应器密封后加热至140℃反应3h，自然冷却至室温后过滤得滤饼，并用去离子水洗涤滤饼至洗涤液呈中性，再将滤饼置于干燥箱中，在60℃下干燥至恒重，得掺镁铝石膏晶须；称取5g玉米淀粉加入100mL去离子水中，在90℃恒温水浴下，以400r/min搅拌糊化40min，再加入2.5g司盘80，2.5g吐温60，在75℃恒温水浴下，以400r/min搅拌20min，得改性淀粉乳化剂；称取25g松香，加热至150℃，使松香完全融化，再以600r/min搅拌并以2mL/min滴加改性淀粉乳化剂，滴加完毕后加入70mL沸水中，以1000r/min继续搅拌15min，随后加入0.2g阳离子聚丙烯酰胺，0.2g聚乙烯醇，以600r/min搅拌30min，冷却至室温后，得改性松香胶；向制备的纸浆悬浮液中加入15g制备的掺镁铝石膏晶须，3g改性松香胶，以300r/min搅拌40min，随后转入纸浆模塑成型机中的模具中滤水至含水率为75%，再以20MPa压力下挤压成型后脱模，得纸浆模塑湿坯，再将纸浆模塑湿坯置于干燥箱中，在90℃下干燥3h后，转入平板硫化机中，在150℃下，以5MPa热压整形5min，得纸浆模塑包装材料。
实例3
称取250g废弃单面瓦楞纸板，将其剪切成20mm×20mm的碎片，并浸泡在2L去离子水中5.5h，再转入碎浆机中破碎打浆至打浆度为25°SR，随后过滤得滤渣，用去离子水洗涤滤渣4次后，将滤渣加入25L去离子水中，以550r/min搅拌1.5h，得纸浆悬浮液；称取25g石膏装入研钵中研磨25min，再将研磨后的石膏粉与500mL质量分数为80%乙二醇水溶液混合后装入高压反应器中，再加入1.2g氯化镁，0.2g氯化铝以250r/min搅拌18min，随后将高压反应器密封后加热至130℃反应2.5h，自然冷却至室温后过滤得滤饼，并用去离子水洗涤滤饼至洗涤液呈中性，再将滤饼置于干燥箱中，在55℃下干燥至恒重，得掺镁铝石膏晶须；称取4g玉米淀粉加入90mL去离子水中，在85℃恒温水浴下，以350r/min搅拌糊化35min，再加入2.3g司盘80，2.3g吐温60，在72℃恒温水浴下，以350r/min搅拌15min，得改性淀粉乳化剂；称取22g松香，加热至145℃，使松香完全融化，再以550r/min搅拌并以1mL/min滴加改性淀粉乳化剂，滴加完毕后加入65mL沸水中，以900r/min继续搅拌12min，随后加入0.1g阳离子聚丙烯酰胺，0.1g聚乙烯醇，以550r/min搅拌25min，冷却至室温后，得改性松香胶；向制备的纸浆悬浮液中加入13g制备的掺镁铝石膏晶须，g改性松香胶，以250r/min搅拌35min，随后转入纸浆模塑成型机中的模具中滤水至含水率为73%，再以15MPa压力下挤压成型后脱模，得纸浆模塑湿坯，再将纸浆模塑湿坯置于干燥箱中，在85℃下干燥2.5h后，转入平板硫化机中，在135℃下，以4MPa热压整形4min，得纸浆模塑包装材料。
将实例1～3中所制备的纸浆模塑包装材料进行性能检测，结果如表1所示。
表1
。

Claims (3)

1.一种纸浆模塑包装材料，其特征在于采用如下制备方法制得，具体制备步骤为：
（1）取废弃单面瓦楞纸板，剪切、浸泡、打浆后过滤，得滤渣，将滤渣水洗3~5次后加入去离子水中，制成纸浆悬浮液；
（2）取石膏、乙二醇溶液、氯化镁、氯化铝装入反应釜中，密封后加热至120~150℃反应2~3h，过滤得滤饼，将滤饼水洗干燥后得掺镁铝石膏晶须；
（3）按固液比1：20~1：30g/mL将玉米淀粉与去离子水混合，在80~90℃下糊化30~40min，再加入乳化剂，在70~75℃下搅拌10~20min，得改性淀粉乳化剂，再取松香加热融化后与改性淀粉乳化剂混合，再加入助留剂，搅拌20~30min后得改性松香胶；
（4）将掺镁铝石膏晶须，改性松香胶，加入纸浆悬浮液中混合均匀，再经纸浆模塑成型机滤水、挤压成型后脱模、干燥、热压整形得纸浆模塑包装材料；
步骤（3）所述的乳化剂为吐温-60，吐温-80，司盘-60，司盘-80中的一种或多种，用量为玉米淀粉质量。
2.如权利要求1所述的一种纸浆模塑包装材料，其特征在于，步骤（3）所述的松香用量为玉米淀粉质量的5~6倍，在140~150℃下加热融化。
3.如权利要求1所述的一种纸浆模塑包装材料，其特征在于，步骤（3）所述的助留剂为阳离子聚丙烯酰胺、聚乙烯醇、聚乙烯亚胺中的一种或两种。
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