CN110872479B - 一种再聚合方法制得的高速卷烟胶 - Google Patents
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Abstract
本发明提供了一种再聚合方法制得的高速卷烟胶，使用固含量40.0%‑65.0%，粘度500‑5000mPa.s的醋酸乙烯‑乙烯乳液、醋酸乙烯‑丙烯酸酯乳液或/和醋酸乙烯均聚乳液为种子乳液，配比抗坏血酸、异抗坏血酸钠、亚硫酸钠、亚硫酸氢钠、焦亚硫酸钠中的一种或几种组合形成的捕捉剂等原料，制备的乳液粘度低于200mPa.s，既能满足机速14000‑16000支/min的烟支搭口粘接需要，也能用于普通材料粘接，如纸加工、涂料装饰、无纺布和地毯等制造行业。
Description
技术领域
本发明涉及高速卷烟胶，具体涉及一种再聚合方法制得的高速卷烟胶。
背景技术
卷烟胶包括搭口胶、接嘴胶、包装胶，在卷烟生产过程中尽管其用量很小，但对烟支卷制、包装质量及卷烟内在质量却起着很重要的作用。卷烟生产过程的特殊性决定了卷烟胶成为一类特殊的粘合剂。首先，在类型的选择上，必须适应卷接包机器喷涂或辊涂的要求，其干燥速度也需适应机器高速生产的要求，且需有较好的材料适应性。其次，卷烟胶需有较高的稳定性，能否在机器上长时间的稳定和干净地运行，对卷烟机器的操作及生产效率会产生很大的影响。现在我国普通的搭口胶固含量为50±2％，粘度500mPa.s-1000mPa.s，满足8000支/分钟的机速生产需要。随着卷烟工作的提速，国内主流卷烟机单枪车速为14000-16000支/min，对搭口胶来说，从其涂在卷烟纸上到烟条出来之间的时间小于0.1秒，干燥时间只有不到0.1秒，否则卷烟机就会出现“跑条”现象而停止工作；因此，这就要求卷烟胶具有优异的粘结性能、流变性能等。普通搭口胶生产方法有调配和再聚合两种。调配方法以VAE乳液为主要原料，常温下按顺序在其中加入聚乙烯醇溶液和其它助剂，混合均匀即可；其缺点是难以制得粘度低且稳定性好的乳液。再聚合方法是在搅拌条件下先将聚乙烯醇溶液加入种子乳液中，而后缓慢加入单体和引发剂进行聚合，聚合完成后将物料降至规定温度，加入消泡剂、杀菌剂、PH调节剂等助剂。由于普通再聚合方法在聚合过程会中会形成新的乳胶粒子，而新粒子粒径较小，使产品中的小乳胶粒数量比例增加，降低了搭口胶的平均粒径，在烟支粘接时小粒子渗透到烟纸内部或附着在烟纸表面的在凹处，不起粘接作用，所以普通再聚合方法很难在保持乳液相对较高的固含量条件下，将乳液粘度降至300mPa.s以下，同时产品粘接效率不高，并不适合高速应用。
发明内容
为了解决现有技术中的问题，本发明的目的在于提供一种卷烟胶，由特定的种子乳液、捕捉剂等原料经再聚合方法制得的卷烟胶，其粘度低于200mPa.s，作为搭口胶能满足机速14000-16000支/min的烟支搭口粘接需要。除特殊说明外，本发明所述百分比为重量百分比，所述份数均为重量份。
本发明的目的是这样实现的：
一种包括种子乳液、醋酸乙烯单体、引发剂、捕捉剂的原料经再聚合方法制得的卷烟胶，其特征在于：所述种子乳液为醋酸乙烯-乙烯乳液、醋酸乙烯-丙烯酸酯乳液、醋酸乙烯均聚乳液中的一种或几种组合；所述的种子乳液固含量40.0％-65.0％，粘度500-5000mPa.s；所述捕捉剂为抗坏血酸、异抗坏血酸钠、亚硫酸钠、亚硫酸氢钠、焦亚硫酸钠中的一种或几种组合。
优选的，本发明所述捕捉剂为抗坏血酸、异抗坏血酸钠、亚硫酸钠的组合物，其中抗坏血酸、异抗坏血酸钠、亚硫酸钠的摩尔比为1:3～7:1～3。
进一步，本发明再聚合方法制备卷烟胶过程中，原料还包括醇类化合物，所述醇类化合物为C2-C10的醇类化合物，优选乙醇、乙二醇、丙三醇、辛醇、癸醇、季戊四醇中的一种或几种组合。
进一步，本发明再聚合方法制得的卷烟胶，其特征在于：按照65-90份种子乳液、0-15份水、0.1-0.5份pH调节剂、0.1-1份氧化剂、0.02-0.5份引发剂、0.5-1.5份醇类化合物、2-15份醋酸乙烯、0.05-0.9份捕捉剂的组成配比制得。
进一步，本发明再聚合方法制备卷烟胶过程中，所述氧化剂选自过氧化氢、过硫酸钾、过硫酸铵、叔丁基过氧化氢中的一种或几种组合。本发明再聚合方法制备卷烟胶过程中，所述引发剂选自过硫酸钾、过硫酸铵、过硫酸钠中的一种或几种组合。本发明再聚合方法制备卷烟胶过程中，所述pH调节剂选自碳酸氢钠、碳酸氢钾、醋酸钠、醋酸铵中的一种或几种组合。
根据本发明的第二方面，本发明还提供上述卷烟胶的制备方法。
上述卷烟胶的制备方法，采用如下步骤：将种子乳液加入反应釜，启动搅拌器，然后加入水、PH调节剂和氧化剂，升温到70-90℃反应20-50min，然后在70-90℃加入醋酸乙烯单体、醇类化合物和引发剂，其中醋酸乙烯单体与醇类化合物混合均匀后同时加料，混合物的加料速度为0.75-1.2g/min，引发剂在加料前用去离子水溶解配制成质量百分浓度为1-10％的引发剂溶液，加料过程中引发剂溶液的加料速度为0.1-0.2g/min；然后保持100-150min，再升高5-15℃后加入用去离子水溶解配制成质量百分浓度为3-12％的捕捉剂溶液后反应20-50min，降温35℃以下，过滤、出料。
根据制备过程的具体情况，本领域普通技术人员可以在加入捕捉剂溶液反应至35℃以下后加入适量的消泡剂或/和杀菌剂，然后过滤、出料。
有益效果：
本发明在普通再聚合方法上通过特定的种子乳液和捕捉剂等原料的配比，和通常再聚合制备的卷烟胶相比，同样都是用以聚乙烯醇作保护胶体的乳液作种子，在产品固含量降低不多的情况下，所得卷烟胶粘度更低，可以得到固含量为40.0-55.0％，粘度为200mPa.s以下的乳液，满足高速搭口胶的使用要求。本发明用醇类化合物与醋酸乙烯混合，结合过硫酸盐与氧化剂及特定的捕捉剂，经再聚合方法制备的卷烟胶，不仅使被氧化剂处理过的已不再稳定的乳液粒子重新获得稳定性，还有利于聚合物分子链在水相分散，减少聚并，降低了新乳胶粒的形成数量，增大了种子乳液粒径，使搭口胶粘接效率更高，粘接速度快。同时本发明制备的高速卷烟胶还有细腻的外观，极少的滤渣和极好的稀释稳定性，非常适合14000-16000支/min高速卷烟生产需要。本发明制备方法所得乳液由于聚合过程经过反复氧化处理，产品中的残余单体能降低至50PPm以下，可作环保型通用粘合剂，适用于纸加工、涂料装饰、木材加工、无纺布和地毯等制造行业。
具体实施方式
下面通过具体实施例对本发明进行具体描述，在此指出以下实施例只用于对本发明进行进一步说明，不能理解为对本发明保护范围的限制，本领域的技术熟练人员可以根据上述发明内容对本发明作出一些非本质的改进和调整。
实施例1
将VAE乳液CW JZ-Ⅱ乳液(中国石化集团重庆川维化工有限公司)800g加入反应釜，启动搅拌器，然后加入92.0g水、3.0g碳酸氢钠和浓度为27.5％的双氧水5.0g，完成后开始升温；当反应釜内物料温度升至80±2℃后，保持温度80±2℃30min；而后以0.75g/min速率匀速加入80.0g醋酸乙烯单体与10.0g乙二醇的混合物，加料时间为120min。醋酸乙烯单体与乙二醇混合物开始加料的同时，以0.1g/min的速率加入百分浓度为5％总量为13.0g的过硫酸钾溶液，加料时间为130min，加料过程保持反应温度为80±2℃；过硫酸钾溶液加料完成后，反应温度升至85-90℃，而后快速加入百分浓度为8％总量为16.0g的捕捉剂溶液(抗坏血酸、异抗坏血酸钠、亚硫酸钠的摩尔比为1:5:2)；30min后降低反应釜温度至35℃以下，加入消泡剂(西安三业精细化工有限公司，牌号9131)和杀菌剂(佛山市蓝峰助剂有限公司的产品，牌号LF-231)；最后过滤、出料既得本发明高速卷烟胶。参照实施例1，按下表1运行实施例2-5，制备本发明高速卷烟胶。
表1实施例2-5组分
使用国标(乙酸乙烯酯－乙烯共聚乳液国家标准GB/T27573-2011)规定的方法对制备的低粘度高速卷烟胶的固含量、粘度、平均粒径以及稀释稳定性等指标进行检测，测定结果见表2。
表2实施例1-5制备的高速卷烟胶性能测定
本发明用醇类化合物与醋酸乙烯混合，结合过硫酸盐与氧化剂及特定的捕捉剂，经再聚合方法制备的卷烟胶，不仅使被氧化剂处理过的已不再稳定的乳液粒子重新获得稳定性，还有利于聚合物分子链在水相分散，减少聚并，降低了新乳胶粒的形成数量，增大了种子乳液粒径，使搭口胶粘接效率更高，粘接速度快。同时本发明制备的高速卷烟胶还有细腻的外观，极少的滤渣和极好的稀释稳定性，非常适合14000-16000支/min高速卷烟生产需要。
Claims (8)
1.一种包括种子乳液、醋酸乙烯单体、引发剂、捕捉剂的原料经再聚合方法制得的搭口胶，其特征在于：按照65-90份种子乳液、0-15份水、0.1-0.5份pH调节剂、0.1-1份氧化剂、0.02-0.5份引发剂、0.5-1.5份醇类化合物、2-15份醋酸乙烯、0.05-0.9份捕捉剂的组成配比制得；所述种子乳液为醋酸乙烯-乙烯乳液、醋酸乙烯-丙烯酸酯乳液、醋酸乙烯均聚乳液中的一种或几种组合；所述的种子乳液固含量40.0%-65.0%，粘度500-5000mPa.s；所述捕捉剂为抗坏血酸、异抗坏血酸钠、亚硫酸钠、亚硫酸氢钠、焦亚硫酸钠中的一种或几种组合；制得的所述搭口胶的固含量为40.0-55.0%，粘度为200mPa.s以下。
2.如权利要求1所述搭口胶，其特征在于：所述捕捉剂为抗坏血酸、异抗坏血酸钠、亚硫酸钠按照摩尔比为1:3～7:1～3组成的组合物。
3.如权利要求1或2所述搭口胶，其特征在于：所述醇类化合物为C2-C10的醇类化合物。
4.如权利要求3所述搭口胶，其特征在于：所述C2-C10的醇类化合物选自乙醇、乙二醇、丙三醇、辛醇、癸醇、季戊四醇中的一种或几种组合。
5.如权利要求1所述搭口胶，其特征在于：所述氧化剂为过氧化氢、过硫酸钾、过硫酸铵、叔丁基过氧化氢中的一种或几种组合。
6.如权利要求1所述搭口胶，其特征在于：所述引发剂为过硫酸钾、过硫酸铵、过硫酸钠中的一种或几种组合。
7.如权利要求1所述搭口胶，其特征在于：所述pH调节剂为碳酸氢钠、碳酸氢钾、醋酸钠、醋酸铵中的一种或几种组合。
8.如权利要求1-7任一项所述搭口胶的制备方法，采用如下步骤：将种子乳液加入反应釜，启动搅拌器，然后加入水、pH调节剂和氧化剂，升温到70-90℃反应20-50min，然后在70-90℃加入醋酸乙烯单体、醇类化合物和引发剂，其中醋酸乙烯单体与醇类化合物混合均匀后同时加料，混合物的加料速度为0.75-1.2g/min，引发剂在加料前用去离子水溶解配制成质量百分浓度为1-10%的引发剂溶液，加料过程中引发剂溶液的加料速度为0.1-0.2g/min；然后保持100-150min，再升高5-15℃后加入用去离子水溶解配制成质量百分浓度为3-12%的捕捉剂溶液后反应20-50min，降温35℃以下，过滤、出料。
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