CN108410212B - 一种重质碳酸钙及制备方法和在喷墨印刷pvc压延膜上的应用 - Google Patents
一种重质碳酸钙及制备方法和在喷墨印刷pvc压延膜上的应用 Download PDFInfo
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Abstract
本发明提供一种重质碳酸钙,其特征在于,所述的重质碳酸钙是方解石经分散剂分散后,再经表面改性剂改性得到。其具体制备方法是将方解石经机械粉碎后送入立式磨机,得到200‑400目碳酸钙粗粉;碳酸钙粗粉加水,调制成固含量为40‑60%的碳酸钙悬乳液,然后加入的分散剂,搅拌均匀;研磨,加表面活性剂,得到改性浆液;改性浆液脱水、烘干、粉碎,得到重质碳酸钙产品。本发明制备的重质碳酸钙产品,具有优异的加工性能,应用于PVC压延膜后,可以有效改善压延膜的力学强度、吸墨性和印刷性等关键性能。
Description
技术领域
本发明涉及一种重质碳酸钙的制备方法,具体地说,尤其是一种喷墨印刷PVC压延膜专用活性碳酸钙的制备方法。
背景技术
PVC压延膜,是指将PVC树脂粉、增塑剂、稳定剂、润滑剂、加工助剂、增韧剂、填充填料等混合后经过压延生产工艺塑化、延展所得到的具有一定宽度、厚度、花纹、满足一定力学性能的、适合油墨印刷的一类薄膜,在工业包装、电工绝缘、充气膜制品、灯箱广告、工程防水、日用品包装等方面都有广泛的应用。
PVC压延膜在生产中为了降低成本,改善延展性,一般需要加入无机填料进行改性,其中,使用最多的是重质碳酸钙填料。随着压延膜在各行各业的广泛应用,对填料的多功能需求也越来越强烈。目前市场上绝大部分的碳酸钙使用的都是硬脂酸或者硬脂酸钠进行表面改性,改性后的碳酸钙填料与PVC基材有较好的相容性,可以有效改善PVC的加工性能和抗冲击性能,但这类压延膜的吸墨性通常都比较羞,难以在喷墨印刷行业推厂应用。随着户外广告业和彩色喷绘技术的飞速发展,彩色PVC压延膜的市场会越来越广阔,对其产品的品质要求也会越来越高,彩膜的表面颜色、对光颜色、边缘颜色、打灯颜色都是要考虑的问题。为了获得高品质的喷绘,PVC压延膜不仅要有适当的吸墨量,更重要的是吸墨迅速。当油墨抵达压延膜的表面时,压延膜表面能够迅速湿润和定位,尽量保持在近表面层中,有适当的散墨性但不渗化、不透印,以获得尽量高的颜色密度;墨滴在压延膜迅速润湿后,尽量减小流动和纵横方向的扩散性,保证影响达到最高清晰度和分辨能力,避免因墨滴的流散引起不同颜色色点的相互掺混和覆盖,造成影响颜色失真。
中国发明专利CN103382277 A公开了一种复合碳酸钙改性PVC压延膜及其制备方法。该发明中碳酸钙的表面处理选用硬脂酸、硅烷、钛酸酯或铝酸酯中的一种或多种来处理,通过这种方法制备的碳酸钙填充压延膜后吸墨性较差,印刷品质不高,并不适合喷墨印刷行业。
发明内容
本发明的目的在于提供了一种喷墨印刷行业的PVC压延膜专用重质碳酸钙的制备方法,不仅可以有效提高PVC的各项力学性能,而且能够提供压延膜优异的吸墨性和印刷效果。
为解决上述问题,本发明的技术方案步骤如下:
1.将选质方解石经机械粉碎后送入立式磨机,得到200-400目碳酸钙粗粉;
2 将步骤(l)得到的粗粉加水,调制成固含量为40-60%的碳酸钙悬乳液,然后加入0.1- 0.5%(以碳酸钙固含量计)的分散剂,搅拌均匀;
3.将步骤(2)的碳酸钙悬浮液输送至剥片机中进行研磨,研磨至D97粒径介于5.0-6.5μm 时,计量加入0.3-0.8%(以碳酸钙固含量计)的表面处理剂进行包覆处理,改性研磨时间为20-40min;
4.将步骤(3)得到的改性浆液脱水、烘干、粉碎,得到本发明的重质碳酸钙产品。
以上所述的优质方解石,其铁含量≤0.3%;铁含量过高,在PVC应用中将导致催化分解,耐热性下降,并影响制品的吸墨性和印刷效果;
以上所述分散剂为聚丙烯酸钠或聚丙烯酸铵,液体状,分子量为3000-5000;分子量过小;影响产品的吸墨印刷性,分子量过高,则不利于研磨细度;
以上所述的表面处理剂为三元聚羧酸与C原子数为12-18的脂肪酸酰胺的混合物,其质量比为1:2-3;多元聚羧酸对油墨具有很强的分散性和吸收性,并可有效防止印刷过程中的渗墨现象;三元聚羧酸的添加量如果过多,将导致碳酸钙悬浮液过度絮凝,不利于产品的分散性,添加比例过少,则达不到良好的吸墨效果;脂肪酸酰胺C原子数目为12-18,如月柱酸酰胺,棕榈酸酰胺、油酸酰胺等其中一种或任意几种的任意配比,C原子数目大于18,将不利于压延膜的吸墨性和印刷效果,C原子数目小于I2则影响其加工性能和分散性能;
以上所述的三元聚羧酸分子结构式如下所示:
以上所述的剥片机研磨,需保证D97粒径介于5.0-6.5μm;粒径过大,则影响压延膜表面的光滑度,导致印刷效果不逼真,分辨力差;粒径过小,则导致PVC加工性能较差,以及加剧制品印刷时的渗墨现象。
本发明制备的重质碳酸钙产品,具有优异的加工性能,应用于PVC压延膜后,可以有效改善压延膜的力学强度、吸墨性和印刷性等关键性能,非常适合用于高品质印刷领域。
具体实施方式
下面将对本发明具体实施方式进行详细描述。旨在帮助读者理解,不能构成对本发明实施范围的限定。
实施例1
将铁含量≤0.3%优质方解石经机械粉碎后送入立式磨机,制备325目的碳酸钙粗粉,并加水调制成固含量为50%的碳酸钙悬浮液;然后加入0.3%分子量为3000的聚丙烯酸钠分散剂,搅拌均匀后输送至剥片机中进行研磨,研磨至D97 粒径为5.8μm时,计量加入0.5%的表面处理剂进行包覆处理,表面处理剂为三元聚羧酸与油酸酰胺的混合物,其质量比为1:2.5,改性研磨时间30min;将改性后的碳酸钙浆液脱水、烘干、粉碎,得到本发明的重质碳酸钙产品。
实施例2
将铁含量≤0.3%优质方解石经机械粉碎后送入立式磨机,制备325目左右的碳酸钙粗粉,并加水调制成固含量为50%的碳酸钙悬浮液;然后加入0.5%分子量为4000的聚内烯酸钠分散剂,搅拌均匀后输送至剥片机中进行研磨,研磨至D97粒径为5.0μm时,计量加入0.8%的表面处理剂进行包覆处理,表面处理剂为三元聚羧酸与月桂酸酰胺的混合物,其质量比为1:3,改性研磨时间30min;将改性后的碳酸钙浆液脱水、烘干、粉碎,得到本发明的重质碳酸钙产品。
实施例3
将铁含量≤0.3%优质方解石经机械粉碎后送入立式磨机,制备325目左右的碳酸钙粗粉,并加水调制成固含量为50%的碳酸钙悬浮液;然后加入0.1%分子量为4000的聚丙烯酸铵分散剂,搅拌均匀后输送至剥片机中进行研磨,研磨至D97粒径为6.4um时,计量加入0.3%的表面处理剂进行包覆处理,表面处理剂为三元聚羧酸与油酸酰胺、月桂酸酰胺的混合物,其质量比为1:2:I,改性研磨时间30min;将改性后的碳酸钙浆液脱水、烘干、粉碎,得到本发明的重质碳酸钙产品。
对比例1
将铁含量≤0.3%优质方解石经机械粉碎后送入立式磨机,制备325目左右的碳酸钙粗粉,并加水调制成固含量为50%的碳酸钙悬浮液;然后加入0.3%分子量为3000的聚丙烯酸钠分散剂,搅拌均匀后输送至剥片机中进行研磨,研磨至D97粒径为5.8μm时,计量加入0.5%的表面处理剂进行包覆处理,表面处理剂为硬脂酸钠,改性研磨时间30min;将改性后的碳酸钙浆液脱水、烘干、粉碎,得到本对比例的重质碳酸钙产品。
对比例2
将铁含量≤0.3%优质方解石经机械粉碎后送入立式磨机,制备325目左右的碳酸钙粗粉,并加水调制成固含量为50%的碳酸钙悬浮液;然后加入0.1%分子量为3000的聚丙烯酸钠分散剂,搅拌均匀后输送至剥月机中进行研磨,研磨至D97粒径为9.8μm时,计量加入0.3%的表面处理剂进行包覆处理,表面处理剂为三元聚羧酸与油酸酰胺、月桂酸酰胺的混合物,其质量比为1:2:1,改性研磨时间3Omin;将改性后的碳酸钙浆液脱水、烘干、粉碎,得到本对比例的重质碳酸钙产品。
将以上实施例与对比例制备的重质碳酸钙分别按表1以下配方制备PVC压延膜基
料,并进行喷墨印刷测试,结果如表2所示。表1 PVC压延膜实验配方
原料名称 | 质量分数/份 |
PVC | 100 |
重质碳酸钙 | 45 |
钙锌稳定剂 | 2.5 |
环氧大豆油 | 10 |
DOP | 30 |
硬脂酸 | 0.5 |
DOTP | 1.5 |
表2 压延膜加工性与喷墨效果
配方 | 加工电流/A | 喷墨印刷效果 |
实施例1 | 1.8-2.0 | 吸墨性好,印刷质量高 |
实施例2 | 1.9-2.3 | 吸墨性好,印刷质量高 |
实施例3 | 1.6-1.8 | 吸墨性好,印刷质量高 |
对比例1 | 2.4-2.7 | 吸墨性差 |
对比例2 | 1.5-1.7 | 印刷效果失真 |
由以上数据可以看出,本发明制备的重质碳酸钙具有良好的加工性能,印刷喷墨质量高,且加工成本低,具有较好的经济效益。
Claims (3)
1.一种重质碳酸钙的制备方法,其特征在于,所述的重质碳酸钙是方解石经分散剂分散后,再经表面改性剂改性得到,所述的分散剂包括聚丙烯酸钠或聚丙烯酸铵,其中聚丙烯酸钠或聚丙烯酸铵的分子量为3000-5000,所述的表面改性剂的添加量为碳酸钙粗粉质量的0.3-0.8%,所述的表面改性剂为三元聚羧酸与C原子数为12-18的脂肪酸酰胺的混合物,其质量比为1:2-3;所述的C原子数为12-18的脂肪酸酰胺包括月桂酸酰胺、棕榈酸酰胺、油酸酰胺中一种或任意几种的任意配比;
所述的三元聚羧酸分子结构式如下所示:
(1)将方解石经机械粉碎后送入立式磨机,得到200-400目碳酸钙粗粉;
(2)将步骤(1)得到的碳酸钙粗粉加水,调制成固含量为40-60%的碳酸钙悬乳液,然后加入的分散剂,搅拌均匀;
(3)将步骤(2)的碳酸钙悬浮液输送至剥片机中进行研磨,研磨至D97粒径介于5.0-6.5μm时,计量加入表面改性剂,研磨时间为20-40min,得到改性浆液;
(4)将步骤(3)得到的改性浆液脱水、烘干、粉碎,得到重质碳酸钙产品。
2.根据权利要求1所述的重质碳酸钙的制备方法,其特征在于,所述的分散剂的添加量为碳酸钙粗粉质量的0.1-0.5%,其中,分散剂包括聚丙烯酸钠或聚丙烯酸铵,其中聚丙烯酸钠或聚丙烯酸铵的分子量为3000-5000。
3.根据权利要求1或2所述制备方法制备得到的重质碳酸钙在喷墨印刷PVC压延膜上的应用。
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