CN108410377B - 一种防拆封纸胶带的制备方法 - Google Patents

一种防拆封纸胶带的制备方法 Download PDF

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CN108410377B
CN108410377B CN201810285375.5A CN201810285375A CN108410377B CN 108410377 B CN108410377 B CN 108410377B CN 201810285375 A CN201810285375 A CN 201810285375A CN 108410377 B CN108410377 B CN 108410377B
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常江
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Abstract

本发明属于胶带领域，具体涉及本发明公开了一种防止拆装的棉纸胶带的制备方法，具体步骤如下：将优选的丙烯酸压敏胶，硅烷偶联剂，异氰酸酯交联剂混合均匀。将胶带涂覆在基材膜上，烘干后贴上棉纸，再在绵纸上继续涂胶，烘干后收卷即可。该胶带在使用之后如果被撕开，其间的绵纸100％被破坏，被包装纸也会被破坏。用于快递包装行业，可以有效起到防盗，防止二次包装的作用。

Description

一种防拆封纸胶带的制备方法
技术领域
本发明属于胶带领域，涉及一种防拆封纸胶带制备方法,该胶带在使用之后如果被撕开，其间的绵纸100％被破坏，被包装纸也会被破坏。用于快递包装行业，可以有效起到防盗，防止二次包装的作用。
背景技术
棉纸胶带具有初粘性好，持粘力高，价格便宜等优点，广泛用于包装行业。然而，在快递包装行业中，包裹在运输过程中被打开，发生偷盗现象时有发生，传统的棉纸胶带，往往可以反复粘结，一定程度上为不法者提供了便利。
CN201817429U公开一种防拆防盗封胶带，包括BOPP带基材，BOPP带基材上表面连接防伪涂料层，防伪涂料层上表面连接第一粘胶层，第一粘胶层上表面连接网状尼龙层，网状尼龙层上表面连接第二胶粘层。所述伪涂料层可以被BOPP带基材上印刷的防伪图文替代。其中增强了防伪胶带的立体结构，使得防伪涂料层在尼龙层和物品层不同表面附着，使用变温方式拆启时再复原，网状尼龙层和物品表面层的防伪涂料很难再次完整重合，用肉眼即可分辨物品已经启封过。但是该胶带整体结构比较复杂，制备成本比较高。
CN203419870U公开一种防盗防拆封胶带，包括防粘层、基膜、不干胶层，防粘层为液体硅油；基膜的材料为PP聚丙稀薄膜或PET聚对苯二甲酸乙二醇(聚脂薄膜)；其中在基膜与不干胶层之间依序设置有蚀刻层、易分离层和标识层。1)蚀刻层，经过蚀刻的基膜的B面经蚀刻后形成了凸凹，易分离层也厚薄不均匀的涂于膜的B面，各点对标识的粘接力不同，印制在易分离层上的标识、图案、商标即标识层受到上面易分离层的各点粘力不同，而下面不干胶层两个力的作用.当受外力撕开时，易分离层各点受力不同，因而不均匀的脱落，如封好的箱体上一旦被拆封，图案、商标、标志会不均匀的破损.而不能复原，肉眼即可观查到箱体是否被打开过。2)标识层，其中标识层印在易分离层上，易分离层处于基膜下表面与蚀刻层间，因蚀刻层存在易分离层厚薄不均匀的涂于基膜的B面，各点对标识层的粘接力形成差异，印制在易分离层上的标识、图案、商标即标识层受到上面易分离层的各点粘力不同，而下面不干胶层两个力的作用，当受外力撕开时，易分离层各点受力不同，因而不均匀的脱落，如封好的箱体上一旦被拆封，因经蚀刻的作用会使图案、商标、标志会被不均匀的破损.而不能复原，肉眼即可观查到箱体是否被打开过。3)易分离层，易分离层涂佈于基膜B面的凸凹面即蚀刻层上，即形成了厚薄不均的易分离层，分离层厚的地方，对标识的粘接力大，分离层薄的地方，对标识层的粘力小，即当外力拆封时，粘接力大的标识层会粘在膜上，分离层薄的标识层会粘在不干胶(即箱体上)这样标识层被破坏而不能复原，肉眼即可看出该箱被拆开过。即使是采用改变温度或湿度的方法拆封包装箱，也会因易分离层各点受力不同，导致胶带不均匀的脱落，哪怕再将包装箱封闭好也一眼能够发现被拆封的痕迹。通过这些上下环节，当事人通过验看包装用的胶带处即可检验包装体在前面物流环节中有无拆封可能，避免了现行的一些物品在物流过程中被人用热吹风机加热封箱胶带，无痕迹拆封盗换物品，而无法查清问题的出处的麻烦。但是该胶带的整体结构也比较复杂。
CN202116484U公开一种防拆胶带，包括基膜2及其上表面的防粘层1，底面是不干胶层5，用于包装封箱或捆绑包装体时，与待包装物表面粘结。在基膜2的下底面与不干胶层间印制有文字或其它标识4，形成产品的特有识别图案。所述的防盗防拆封胶带，是在基膜2的下底面与不干胶层5间，制作一层易分解层3，在易分解层下底面印制产品的文字色彩标识层4，再将不干胶层5制作在标识层4上。易分解层3与基膜2有好的粘结力，但小于与包装箱面直接粘结为一体的不干胶层5的粘结力，与标识层4和不干胶层5间有相对易剥离的粘结力。这样，当采用改变温度或湿度来拆取封箱胶带时，易分解层3和基膜2一起脱离与标识层4粘结为一体的不干胶层5，即标识层4和不干胶层5还原封不动地粘结在包装体表面，留下清晰的痕迹。该结构依赖易分解层的两边不同的粘结力，不能达到百分百的防拆准确率。
综上所述，提供一种结构简单且方便判断是否拆装的胶带是十分迫切的。
发明内容
本发明目的就在于提供一种结构简单、可以直接判断是否拆装的胶带。
本发明首先提供一种棉纸胶带，其特征在于具体的制备方法步骤如下：
将丙烯酸压敏胶、硅烷偶联剂组合物，异氰酸酯交联剂混合均匀；将胶带涂覆在基材膜上，烘干后贴上棉纸，再在绵纸上继续涂胶，烘干后收卷即可；
所述丙烯酸压敏胶是指在玻璃化转变温度在-60℃～-20℃之间，23℃下，储能模量介于2x104～8x104pa之间，且聚合物可与异氰酸酯交联反应的压敏胶；
所述硅烷偶联剂为含有环氧官能团的硅烷偶联剂。
进一步优选的，其特征在于丙烯酸压敏胶的制备方法如下：将丙烯酸异辛酯(2-EHA)20～40wt％,丙烯酸丁酯(BA)10～15wt％，丙烯酸羟乙酯(HEA)1～5wt％，乙酸乙酯40～60wt％，甲醇0.1～10wt％混合均匀，除氧后加热至60℃，加入引发剂偶氮二异丁腈AIBN0.02～0.2wt％，反应4h，升温至68℃继续反应24h出料。
进一步优选的，其特征在于异氰酸酯交联剂为甲苯二异氰酸酯TDI、二苯基甲烷二异氰酸酯MDI、或异佛尔酮二异氰酸酯IPDI。
进一步优选的，其特征在于硅烷偶联剂为γ―(2,3-环氧丙氧)丙基三甲氧基硅烷(KH560)。
进一步优选的，其特征在于涂胶厚度为干胶20-150um。
本发明同时提供丙烯酸压敏胶和硅烷偶联剂组合物用于绵纸胶带的防止拆装的用途，包括：
所述组合物中的丙烯酸压敏胶是指在玻璃化转变温度在-60℃～-20℃之间，23℃下，储能模量介于2x104～8x104pa之间，且聚合物可与异氰酸酯交联反应的压敏胶；
所述组合物中的硅烷偶联剂为含有环氧官能团的硅烷偶联剂；
将丙烯酸压敏胶、硅烷偶联剂组合物与异氰酸酯交联剂混合均匀；将胶带涂覆在基材膜上，烘干后贴上棉纸，再在绵纸上继续涂胶，烘干后收卷即可。
进一步优选的，其特征在于丙烯酸压敏胶的制备方法如下：将丙烯酸异辛酯(2-EHA)20～40wt％,丙烯酸丁酯(BA)10～15wt％，丙烯酸羟乙酯(HEA)1～5wt％，乙酸乙酯40～60wt％，甲醇0.1～10wt％混合均匀，除氧后加热至60℃，加入引发剂偶氮二异丁腈AIBN0.02～0.2wt％，反应4h，升温至68℃继续反应24h出料。
进一步优选的，其特征在于异氰酸酯交联剂为甲苯二异氰酸酯TDI、二苯基甲烷二异氰酸酯MDI、或异佛尔酮二异氰酸酯IPDI。
进一步优选的，其特征在于硅烷偶联剂为γ―(2,3-环氧丙氧)丙基三甲氧基硅烷(KH560)。
进一步优选的，其特征在于涂胶厚度为干胶20-150um。
本发明的技术方案中在两个胶层之间增加一个纸质层，由于采用合理设计的丙烯酸压敏胶，额外添加带环氧集团的硅烷偶联剂，通过偶联剂与纸张上的羟基作用，发生化学反应，保证了胶质层和纸层之间的粘结力。
因此在拆装时，由于两个胶层都对中间的纸层有强的结合力，拉扯后会使得中间的纸层破裂，从而可以很容易判断出包装被拆开过。
其次，由于该胶层和包装纸之间也具有极强的结合力，从而在拆包装时也会破坏包装纸，从而提供拆装判断的第二个标准。
本发明针对包装行业长久以来存在的二次包装问题，针对性的优化胶带配方，改进了胶带的结构，进而实现棉纸胶带不能重复利用，保证了包装的安全性。
本发明目的在于提供一种破纸棉纸胶带的制备方法，通过配方设计和特殊的结构，实现了包装胶带的100％破坏率，提高了包装的安全性。
具体实施方式
实施例1
将本发明的丙烯酸压敏胶、硅烷偶联剂组合物，异氰酸酯交联剂混合均匀形成胶溶液，将该溶液均匀涂覆在基材膜上，热风烘干，烘干后贴上棉纸层，再在纸层上继续涂胶，再次热风烘干，烘干后收卷即可。
将该胶带分别在10个不同厚度的包装盒上测试。
封装后，如果再次拆装，中间绵纸层100％被破坏，被包装纸也100％被破坏。
压敏胶胶层的储能模量在压敏胶经涂布干燥后用型号为Rheogel-E4000的动态粘弹谱仪测试。
实施例2
将丙烯酸异辛酯(2-EHA)200g丙烯酸丁酯(BA)100g，丙烯酸羟乙酯(HEA)10g，乙酸乙酯450g，甲醇8g混合均匀，除氧后加热至60℃，加入引发剂偶氮二异丁腈AIBN 2g，反应4h，升温至68℃继续反应24h出料。
将所得胶水按1000:1:5的比例与MDI、KH560混合，混合时先制备丙烯酸压敏胶、硅烷偶联剂组合物，再加入交联剂MDI，搅拌均匀后涂布棉纸胶带。首先将胶水涂布在离型膜上，烘干后贴覆棉纸，再在棉纸上涂覆压敏胶，烘干后收卷即得成品。控制涂布的干胶厚度每侧为75um。
实施例3
将丙烯酸异辛酯(2-EHA)250g丙烯酸丁酯(BA)80g，丙烯酸羟乙酯(HEA)7.5g，乙酸乙酯500g，甲醇10g混合均匀，除氧后加热至60℃，加入引发剂偶氮二异丁腈AIBN 1.8g，反应4h，升温至68℃继续反应24h出料。
将所得胶水按1000:1:5的比例与TDI、KH560混合，混合时先制备丙烯酸压敏胶、硅烷偶联剂组合物，再加入交联剂MDI，搅拌均匀后涂布棉纸胶带。首先将胶水涂布在离型膜上，烘干后贴覆棉纸，再在棉纸上涂覆压敏胶，烘干后收卷即得成品。控制涂布的干胶厚度每侧为100um。
实施例4
将丙烯酸异辛酯(2-EHA)180g丙烯酸丁酯(BA)120g，丙烯酸羟乙酯(HEA)15g，乙酸乙酯450g，甲醇7.5g混合均匀，除氧后加热至60℃，加入引发剂偶氮二异丁腈AIBN 1.2g，反应4h，升温至68℃继续反应24h出料。
将所得胶水按1000:1:10的比例与MDI、KH560混合，混合时先制备丙烯酸压敏胶、硅烷偶联剂组合物，再加入交联剂MDI，搅拌均匀后涂布棉纸胶带。首先将胶水涂布在离型膜上，烘干后贴覆棉纸，再在棉纸上涂覆压敏胶，烘干后收卷即得成品。控制涂布的干胶厚度每侧为50um。
实施例5
将丙烯酸异辛酯(2-EHA)210g丙烯酸丁酯(BA)100g，丙烯酸羟乙酯(HEA)20g，乙酸乙酯450g，甲醇2g混合均匀，除氧后加热至65℃，加入引发剂偶氮二异丁腈AIBN 2g，反应4h，升温至72℃继续反应24h出料。
将所得胶水按1000:1:8的比例与IPDI、KH560混合，混合时先制备丙烯酸压敏胶、硅烷偶联剂组合物，再加入交联剂MDI，搅拌均匀后涂布棉纸胶带。首先将胶水涂布在离型膜上，烘干后贴覆棉纸，再在棉纸上涂覆压敏胶，烘干后收卷即得成品。控制涂布的干胶厚度每侧为75um。
对比例1
与实施例2的不同仅在于硅烷偶联剂KH560替换为偶联剂钛酸四丁酯。将该胶带分别在10个不同厚度的包装盒上测试。
封装后，如果再次拆装，中间绵纸层仅20％被破坏，被包装纸也20％被破坏。
对比例2
与实施例2的不同仅在于所得压敏胶的储能模量为1*104Pa。将该胶带分别在10个不同厚度的包装盒上测试。封装后，如果再次拆装，中间绵纸层仅21％被破坏，被包装纸也21％被破坏。
对比例3
与实施例2的不同仅在于所得压敏胶的储能模量为9*104Pa。将该胶带分别在10个不同厚度的包装盒上测试。封装后，如果再次拆装，中间绵纸层仅30％被破坏，被包装纸也30％被破坏。
储能模量和压敏胶的胶粘特性相关，测量本申请的压敏胶的储能模量，结果如下：
实施例2 实施例3 实施例4 实施例5
储能模量 2.5*10<sup>4</sup>Pa 6.7*10<sup>4</sup>Pa 5.9*10<sup>4</sup>Pa 4.3*10<sup>4</sup>Pa

Claims (10)

1.一种棉纸胶带，其特征在于具体的制备方法步骤如下：
将丙烯酸压敏胶、硅烷偶联剂组合物，异氰酸酯交联剂混合均匀，然后将其涂覆在基材膜上，烘干后贴上棉纸，再在绵纸上继续涂胶，烘干后收卷即可；
所述丙烯酸压敏胶是指在玻璃化转变温度在-60℃～-20℃之间，23℃下，储能模量介于2x104～8x104pa之间，且聚合物可与异氰酸酯交联反应的压敏胶；
所述硅烷偶联剂为含有环氧官能团的硅烷偶联剂。
2.根据权利要求1所述的棉纸胶带，其特征在于丙烯酸压敏胶的制备方法如下：将丙烯酸异辛酯(2-EHA)20～40wt％,丙烯酸丁酯(BA)10～15wt％，丙烯酸羟乙酯(HEA)1～5wt％，乙酸乙酯40～60wt％，甲醇0.1～10wt％混合均匀，除氧后加热至60℃，加入引发剂偶氮二异丁腈AIBN 0.02～0.2wt％，反应4h，升温至68℃继续反应24h出料。
3.根据权利要求1所述的棉纸胶带，其特征在于异氰酸酯交联剂为甲苯二异氰酸酯TDI、二苯基甲烷二异氰酸酯MDI、或异佛尔酮二异氰酸酯IPDI。
4.根据权利要求1所述的棉纸胶带，其特征在于硅烷偶联剂为γ-(2,3-环氧丙氧)丙基三甲氧基硅烷(KH560)。
5.根据权利要求1所述的棉纸胶带，其特征在于涂胶厚度为干胶20-150μm。
6.丙烯酸压敏胶和硅烷偶联剂组合物用于绵纸胶带的防止拆装的用途，包括：
所述组合物中的丙烯酸压敏胶是指在玻璃化转变温度在-60℃～-20℃之间，23℃下，储能模量介于2x104～8x104pa之间，且聚合物可与异氰酸酯交联反应的压敏胶；
所述组合物中的硅烷偶联剂为含有环氧官能团的硅烷偶联剂；
将丙烯酸压敏胶、硅烷偶联剂组合物与异氰酸酯交联剂混合均匀，然后将其涂覆在基材膜上，烘干后贴上棉纸，再在绵纸上继续涂胶，烘干后收卷即可。
7.根据权利要求6的用途，其特征在于丙烯酸压敏胶的制备方法如下：将丙烯酸异辛酯(2-EHA)20～40wt％,丙烯酸丁酯(BA)10～15wt％，丙烯酸羟乙酯(HEA)1～5wt％，乙酸乙酯40～60wt％，甲醇0.1～10wt％混合均匀，除氧后加热至60℃，加入引发剂偶氮二异丁腈AIBN 0.02～0.2wt％，反应4h，升温至68℃继续反应24h出料。
8.根据权利要求6的用途，其特征在于异氰酸酯交联剂为甲苯二异氰酸酯TDI、二苯基甲烷二异氰酸酯MDI、或异佛尔酮二异氰酸酯IPDI。
9.根据权利要求6的用途，其特征在于硅烷偶联剂为γ―(2,3-环氧丙氧)丙基三甲氧基硅烷(KH560)。
10.根据权利要求6的用途，其特征在于涂胶厚度为干胶20-150μm。
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