CN104610628A - 一种环保型合成石头纸的制备方法 - Google Patents

一种环保型合成石头纸的制备方法 Download PDF

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CN104610628A
CN104610628A CN201310537846.4A CN201310537846A CN104610628A CN 104610628 A CN104610628 A CN 104610628A CN 201310537846 A CN201310537846 A CN 201310537846A CN 104610628 A CN104610628 A CN 104610628A
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王锡臣
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Abstract

本发明公开了一种环保型合成石头纸的制备方法。合成纸是由30～50wt％聚烯烃共混物、40～60wt％天然无机矿物粉和5～10wt％助剂组成。天然无机矿物粉与载体树脂先经双螺杆挤出机造粒、制成母粒，再将母粒与聚烯烃混合物和助剂混合均匀，经双螺杆挤出机、T型模头压出、双辊拉伸成型设备、制成不同厚度幅宽为：100～：1000cm。该纸无机矿物粉填充量高，由于采用低发泡技术，密度为1.2～1.4g／cm3，使用后可白行降解，是一种理想的环保型包装材料。本发明制得的合成纸力学性能、耐水性和印刷性能均优于普通纸，成本比普通纸低20～30％，可广泛应用于包装、商标和装饰等领域。

Description

一种环保型合成石头纸的制备方法
随着社会的发展，人们的物质生活水平和文化水平不断提高，对纸的需求量也越来越大。普通纸是由木材和各种植物纤维经化学处理后制得的。地球上森林资源是有限的，大量树木的砍伐将直接影响到人类的生存环境。造纸过程中还将产生大量的污水、污泥，污染环境。本发明采用生产压延或流延塑料模相似设备和工艺制备合成纸，设备投资少，无环境污染，又节约木材。与传统的合成纸相比，无机矿物粉填充量大，采用低发泡技术，在无机矿物粉填充量高达40～60wt％的情况下，纸的密度为1.2～1.4g／cm3，不仅降低了造纸成本，还可改善纸的韧性和印刷性。如果配方中填加一定量的光敏剂，用后遗弃在自然界中可自行降解，如不加光敏剂用后可回收再利用。
本发明在天然无机矿物粉表面活化处理中，采用硅烷偶联剂、钛酸脂联偶剂、铝酸脂偶联剂、酸式亚磷酸脂偶联剂中的一一种或两种及两种以t复配物，进行表面物理或化学活化处理，偶联剂的用量是天然无机矿物粉2～4wt％。天然无机矿物粉采用重质碳酸钙、轻质碳酸钙、滑石粉、硅灰石粉、高岭土、膨润土、钛白粉中的一种或两种及两种以上的混合物，粒径为10～15mm，在800～1200r／min高速搅拌机内，于80～100℃下进行表面活化处理5～10min，再加入润滑剂微晶石蜡、液体石蜡、聚乙烯蜡和硬脂酰胺中的一种或两种复配物和聚乙烯或聚丙烯混按一定比例合均匀后，经高效双螺杆挤出机在185～210℃下挤出造粒，可制得分散性好、性能优良的天然无机矿物粉母粒。母粒中偶联剂含量为2～3wt％，润滑剂含量为2～3wt％，聚乙烯或聚丙烯含量为9～16wt％。无机矿物粉含量为80～85wt％。
本发明所用的助剂如权利要求4所述，品种繁多，为了保证合成纸的强度、韧性、挺括性、折叠性和印刷性以及加工过程中材料的熔体强度，应至少选用两种或两种以上的聚烯烃，通过多种聚烯烃共混改性，提高合成纸的性能。选择聚烯烃过程中必须考虑不同聚烯烃之间的相容性和聚烯烃与天然无机矿粉之间的
亲和性，聚烯烃之间相容性越好，聚烯烃与天然无机矿粉之间亲和性越强，合成纸的性能越好。
本发明合成纸成型设备和成型工艺是参考压延或流延法生产塑料模的设备和工艺设计的。单螺杆挤出机螺杆直径为90～120mm，长径比为1：30～32，T型模头宽度为100～120cm，螺筒加工温度为190～230℃。物料出模后经三辊压延或流延，冷却后二次加热至120～150℃，再经双辊拉伸、电晕处理后卷取成产品。合成纸的厚度由模头口径和拉伸速度控制。
实施例1
取83Kg1250目(粒径12mm)重质碳酸钙粉和2Kg锐钛型钛白粉，加入2Kg钛酸脂偶联剂，于高搅机内在90℃下，以800r／min转速搅拌10min，再加入2Kg微晶石蜡和11Kg低密度聚乙烯，继续搅拌2rain后用65型长径比为1：36的双螺杆挤出机于190～230℃下挤出造粒，制得碳酸钙填充母粒。
取母粒50Kg与高密度聚乙烯16K_g、聚丙烯14Kg、乙烯／丙烯共聚物4Kg、聚丙烯一丙烯酸接枝共聚物3Kg、微晶石蜡1.2Kg、环氧大豆油0.8Kg、偶氮二甲酰胺1Kg混合均匀后加工成型。螺筒温度为190～220℃，模头温度为210℃，二次加热温度为130℃，双辊拉伸比为1：1_3。
实施例2
取实例1中制得的母粒50Kg与聚乙烯10Kg、低密度聚乙烯8Kg、氯化聚乙烯3Kg、聚乙烯蜡1Kg、光降解母粒3Kg、偶氮二碳酸二异丙脂1.2Kg，混合均匀后，加工成型。螺筒温度为190～210℃，模头温度为210℃，二次加热温度为120℃，双辊拉伸比为1：1.3.该合成纸可自行降解。
实施例3
取75Kg800目(粒径15914rn)滑石粉与5Kg同样粒度的硅灰石粉，加入1.5Kg钛酸酯／铝酸酯复合偶联剂和2K.g液体石蜡，与高搅机内在90℃下以1000r／min转速搅拌6min，再加入16.5Kg聚丙烯继续搅拌10min后，用70型长径比为1：36的双螺杆挤出机于190～230℃下挤出造粒，制得母粒。
取得母粒50Kg与聚丙烯10Kg、高密度聚乙烯12Kg、硬脂酰胺1Kg、乙烯／丙烯共聚物2Kg、N·N一二亚硝基五次甲基四胺1.6Kg混合均匀后，加工成型。螺筒温度为190～230℃，模头温度为220℃，二次加热温度为140℃，双辊拉伸比为1：1.25。
实施例4
取实例3中制得的母粒50Kg与聚丙烯14Kg、高密度聚乙烯4Kg、低密度聚乙烯2K卧乙烯／醋酸乙烯1.5Kg、聚乙烯蜡1.5Kg、光降解母粒2.Kg、偶氮二甲酰胺1.5Kg混合均匀后，加工成型。螺筒温度为195～230℃，模头温度为220℃，1_一次加热温度为130℃，双辊拉伸比为1：1.2，该合成纸可自行降解。

Claims (6)

1.一种环保型合成石头纸的制备方法，包括合成纸的组成即聚烯烃共混物30～50wt％、天然无机矿物粉40～70wt％、助剂5～10wt％和合成纸的制备工艺即天然无机矿物粉工艺和合成纸成型工艺。
2.根据权利要求1所述，合成纸组成中的聚烯烃混合物为：聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、乙烯、氯化聚乙烯、乙烯／丙烯共聚物、乙烯／醋酸乙烯共聚物、乙烯／丙烯酸脂共聚物、聚乙烯一丙烯酸接枝共聚物、聚乙烯一马来酸酐接枝共聚物、聚丙烯一丙烯酸接枝共聚物、聚丙烯一马来酸酐接枝共聚物中的两种或两种以上共聚物。
3.根据权利要求1所述，合成纸组成中的天然无机矿物粉为：重质碳酸钙、轻质碳酸钙、滑石粉、硅灰石粉、高岭土、膨润土、钛白粉中的一种或两种及两种以上的混合物。其粒径应小于15mm(大于800目)。
4.根据权利要求1所述，合成纸组成中的助剂为：润滑剂有：微晶石蜡、液体石蜡、聚乙烯蜡和硬脂酰胺；增塑剂有：邻苯二甲酸二脂类、磷酸脂类、癸二酸脂类和环氧天然油脂类；联偶剂有：硅烷联偶剂、钛酸脂联偶剂、铝酸脂联偶剂、酸脂类磷酸脂联偶剂；发泡剂有：物理发泡剂为低沸点烷烃、环烷烃、醇和醚；化学发泡剂为偶氮二甲酰胺、偶氮二碳酸二异丙脂、N·N一二亚硝基五次甲基四胺、碳酸氢铵；荧光增白剂；珠光剂和光降解剂。
5.根据权利要求1所述，合成纸制备工艺中天然无机矿物粉母粒制备工艺为：将天然无机矿物粉与一种或两种及两种以上偶联剂复配物于高搅机内根据权利要求1所述，合成纸制备工艺中天然无机矿物粉母粒制备工艺为：将天然无机矿物粉与一种或两种及两种以上偶联剂复配物于高搅机内在80～100℃下搅拌5～20min，再加入的一种或两种以上润滑剂和载体树脂聚乙烯或聚丙烯混合均匀后，经双螺杆挤出机挤出造粒、母粒中天然无机矿物粉含量为80～85wt％，偶联剂含量为2～3wt％，润滑剂为2～3wt％，聚乙烯或聚丙烯含量为9～16wt％。
6.根据权利要求1所述，合成纸制备工艺中合成纸成型工艺为：根据合成纸的组成，将聚烯烃、天然无机矿物粉母粒、各种助剂按比例混合均匀，经单螺杆挤出机、T型模头、三辊压延、冷却、二次加热、双轴拉伸、电晕处理后卷取即得新型合成纸。在合成纸总组成范围内，调节各组分的用量，可制得不同性能、不同厚度和不同密度、适合不同用途的环保新型合成纸。
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