CN111748221A - 一种滑石粉的造粒方法 - Google Patents

一种滑石粉的造粒方法 Download PDF

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CN111748221A
CN111748221A CN202010646000.4A CN202010646000A CN111748221A CN 111748221 A CN111748221 A CN 111748221A CN 202010646000 A CN202010646000 A CN 202010646000A CN 111748221 A CN111748221 A CN 111748221A
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scattering
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曹林
郭强
郭圣杰
侯凤寿
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Shanghai Qirun Chemical Co ltd
Shandong Qirunyuan New Material Technology Co ltd
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Shandong Qirunyuan New Material Technology Co ltd
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Abstract

本发明涉及一种聚烯烃填充剂的制法，具体是一种滑石粉的造粒方法，本质上包括滑石粉浆料湿法研磨后，经干燥、打散、过筛得到超细滑石粉体的步骤，其特征是，包括在打散步骤干燥粉体加入0.3～0.5wt％的单十八(烷)酸丙三醇酯，然后在打散机进行打散的步骤。本发明通过在打散造粒过程中，添加单甘脂，使滑石粉表面改性，增加了其可造粒性，其得到的超细滑石粉最大粒径为1μm，平均粒径为0.8μm，且得率在85％左右。

Description

一种滑石粉的造粒方法
技术领域
本发明涉及一种聚烯烃填充剂的制法，具体是一种滑石粉的造粒方法。
背景技术
滑石粉是一种由层状硅酸盐晶体组成的矿物，分子式为Mg3[Si4O10](OH)2，是塑料工业中常用的一种无机填料。在无机填料中，滑石粉的硬度最低，对机械设备磨损小，特别是由于近年来用新的粉碎技术，得到了超细滑石粉，其良好的填充效果受到人们重视。
滑石粉表面有亲水性基团，并呈极性，而聚合物多数有疏水性，两者之间的相容性差。现有技术中，通常采用混加偶联剂，例如：硅烷类偶联剂、钛酸酯偶联剂等，对滑石粉进行改性，其主要目的是改善填料与聚合物之间的相容性，从而增强填充复合体系中组分界面之间的相互作用。
现有技术试验表明，随着滑石粉粒径的降低，其填充的聚烯烃的拉伸强度、拉伸弹性模量均增加。目前，对于2500目以及更细的滑石粉的需求越来越大。
滑石粉造粒一般采用球磨后过筛的方式，由于超细滑石粉表面能大，造粒比较困难。
经检索，现有文献与专利中没有对滑石粉造粒的记载。
发明内容
本发明提供一种滑石粉的造粒方法，其通过对滑石粉表明改性并进行两次球磨，增加了滑石粉的可造粒性。
本发明具体采用的技术方案是：
一种滑石粉的造粒方法，其特征是，包括如下步骤：
1)配置浆料：
将200～400目滑石粉体、分散剂与水配制成固含量为55～65％的浆料；
其中，所述滑石粉体优选为200目、325目，白度大于89％，密度为2.8～3.0g/m3；选择这两种粉体的原因在于市场容易获得，价格相对低廉。
其中，所述分散剂是双聚异丁烯丁二酰亚胺、十二烷基苯磺酸钠、十二烷基三甲基氯化铵或十六烷基溴化胺中的一种，分散剂可选购市售商品。
其中，所述分散剂添加量为滑石粉体重量的1～3％。
2)湿法研磨：
将步骤(1)得到的浆料进行湿法研磨，得到最大粒径为1μm的浆料；
其中，湿法研磨步骤的研磨球为直径为5mm的氧化锆球或直径为5mm的钢球，研磨球填充率为30-35％，求料比为3.5～4；研磨时间为30～150min；
3)干燥：
经步骤(2)得到的浆料干燥至含水量低于3％，收集干燥粉体；
4)打散造粒：
将步骤(3)得到的干燥粉体加入0.3～0.5wt％的单十八(烷)酸丙三醇酯(英文名Glycerin monostearate简称:GMS)，然后在打散机进行打散，使团聚的粉体得到解散，过筛得本发明的滑石粉。
经申请人试验证明，在打散造粒过程中，造粒比较困难，通过加入单甘酯(GMS)，使滑石粉表面改性，增加了其可造粒性。
与现有技术相比，本发明的优点在于：
本发明通过在打散造粒过程中，添加单甘脂，使滑石粉表面改性，增加了其可造粒性，其得到的超细滑石粉最大粒径为1μm，平均粒径为0.8μm，且得率在85％左右。
具体实施方式
实施例
1)配置浆料：
选用原料滑石粉，过325目筛，其平均粒径15.9μm，白度90％，密度2.91g/m3，化学成分CaO 2.94％，SiO2 64.65％，MgO 32.40％，其他不可避免杂质0.01％(上述均为重量百分数)。
取上述原料滑石粉100Kg，加入1Kg双聚异丁烯丁二酰亚胺，加水搅拌，得到固含量为60％的浆料。
现有技术中，浆料一般选取固含量为70％左右，申请人发现，固含量过高不利于得到超细的滑石粉体，因此，本发明固含量最高在65％，以55％所得最终产品粒径为最佳，考虑到经济因素，本实施例选用固含量为60％的浆料。
2)湿法研磨：
将步骤(1)得到的浆料进行湿法研磨，得到最大粒径为1μm的浆料；
其中，湿法研磨步骤的研磨球为直径为5mm的氧化锆球，研磨球填充率为35％，求料比为3.5～4；研磨时间为60min；
申请人经试验得知，研磨60min粒径可得目标粒径，继续研磨可使目标产品白度进一步提高，因此，本发明研磨时间限定最长为150min。
3)干燥：
经步骤(2)得到的浆料干燥至含水量低于2.5％，收集干燥粉体；
4)打散造粒：
将步骤(3)得到的干燥粉体加入0.4wt％的单十八(烷)酸丙三醇酯(英文名Glycerin monostearate简称:GMS)，然后在打散机进行打散，使团聚的粉体得到解散，过筛得本发明的滑石粉。
经申请人试验证明，在打散造粒过程中，造粒比较困难，通过加入单甘酯(GMS)，使滑石粉表面改性，增加了其可造粒性。

Claims (5)

1.一种滑石粉的造粒方法，本质上包括滑石粉浆料湿法研磨后，经干燥、打散、过筛得到超细滑石粉体的步骤，其特征是，包括在打散步骤干燥粉体加入0.3～0.5wt％的单十八(烷)酸丙三醇酯，然后在打散机进行打散的步骤。
2.根据权利要求1所述的滑石粉的造粒方法，其特征是，还依次包括如下步骤：
1)配置浆料：
将200～400目滑石粉体、分散剂与水配制成固含量为55～65％的浆料；
2)湿法研磨：
将步骤1)得到的浆料进行湿法研磨，得到最大粒径为1μm的浆料；
3)干燥：
经步骤2)得到的浆料干燥至含水量低于3％，收集干燥粉体；
4)打散、过筛造粒。
3.根据权利要求1所述的滑石粉的造粒方法，其特征是，步骤1)所述滑石粉体粒度为200目、325目，白度大于89％，密度为2.8～3.0g/m3。
4.根据权利要求1所述的滑石粉的造粒方法，其特征是，步骤1)所述分散剂是双聚异丁烯丁二酰亚胺、十二烷基苯磺酸钠、十二烷基三甲基氯化铵或十六烷基溴化胺中的一种，所述分散剂添加量为滑石粉体重量的1～3％。
5.根据权利要求1所述的滑石粉的造粒方法，其特征是，步骤2)所述湿法研磨步骤的研磨球为直径为5mm的氧化锆球或直径为5mm的钢球，研磨球填充率为30-35％，求料比为3.5～4；研磨时间为30～150min。
CN202010646000.4A 2020-07-07 2020-07-07 一种滑石粉的造粒方法 Pending CN111748221A (zh)

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