CN108715695A - 一种高耐候的水性汽车级涂料专用珠光粉的制备方法 - Google Patents
一种高耐候的水性汽车级涂料专用珠光粉的制备方法 Download PDFInfo
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Abstract
本发明涉及一种高耐候的水性汽车级涂料专用珠光粉的制备方法，它以具有一定粒径分布的云母表面包覆SnO2、TiO2、Fe2O3等金属氧化物制得一系列普通珠光颜料，采用Al2O3/SiO2/ZnO2等稳定的金属氧化物对珠光颜料表面进行包覆，再经过抽滤、洗涤、烘干、煅烧得到高耐候的珠光粉基材，再用有机硅偶联剂对颜料进行表面改性，再经过抽滤、冼涤、烘干得到具有高耐候水性汽车级涂料专用珠光粉。本发明设计合理、操作简单、能耗低、性能优良、环保、适合于大规模生产，适于汽车、室外装饰等对耐候性要求、环保要求较高的场合。
Description
技术领域
本发明属于颜料技术领域，具体涉及一种高耐候的水性汽车级涂料专用珠光粉的制备方法。
背景技术
目前，高档汽车涂装用珠光粉主要为油性体系，且其存在以下缺点是：
生产成本较高：生产传统的汽车级耐候珠光粉，先将云母经过水解包覆、抽滤、煅烧、筛粉、混合后制得普通珠光粉，再将普通珠光粉投入到反应釜中包覆性质稳定、能够吸收紫外光的金属、非金属氧化物，抽滤烘干后，再包覆有助于分散的有机物；在这个过程中，制得普通珠光粉后要2次投入反应釜中，2次包覆，2次抽滤烘干，过程复杂，成本较高；
耐候效果不够优秀：性质稳定、能够吸收紫外光的金属、非金属氧化物包覆到珠光粉表面后，没有经过煅烧，包覆层不够致密，且与TiO2/Fe2O3的层间结构也不够紧密，易形成缝隙，影响耐候性和持续稳定性；
不环保：传统的汽车级珠光粉均用于油性体系，为了增强珠光粉在油体系的分散性，通常会在珠光粉外层包覆有亲油疏水的有机硅偶联剂，包覆这种类型的偶联剂后，珠光粉流动性太强，极易扬尘，污染环境。
随着国家对环保的越来越重视，汽车涂料水性化以经是一种趋势；
发明内容
针对现有技术的不足，本发明旨在提供一种高耐候的水性汽车级涂料专用珠光粉的制备方法。
本发明的技术方案是，一种高耐候的水性汽车级涂料专用珠光粉的制备方法，它包括以下步骤：
a)取云母粉投入烧杯中，加入纯水，置于恒温水浴锅中加热，同时搅拌，制得云母浆；
b)向步骤a)制得的云母浆中加入HCl以调整PH值至1.5-1.7，待PH值、温度、转速稳定后，匀速滴加SnCl4溶液，滴加完毕后继续搅拌；
c)用稀碱调整溶液的PH值至2.0，再以一定的加料速度加入TiOCl2溶液，加料至淡金干涉色相，加完继续搅拌；
d)用稀碱慢调PH值至3.3，再以一定的速度滴加FeCl3溶液至RK300金色色相，加完后继续搅拌；
e)用稀碱慢调PH值至5.5，滴加AlCl3，加入稀碱保持PH值为5.5，加完后继续搅拌；
f)用稀碱慢调PH值至7.5，然后加入ZnCl2溶液，用稀碱保持PH值为7.5，加完后继续搅拌；
g)加入NaSiO3浓液，加完后继续搅拌；
h)将溶液抽滤、烘干后，800℃煅烧30分钟，得到高耐候金色珠光粉；
i)取步骤g)制得的高耐候珠光粉投入到烧杯中，加入纯水，搅拌，加热，加入有机硅偶联剂，搅拌约2小时、抽滤、烘干后即得高耐候的水性汽车级涂料专用珠光粉。
进一步的，上述步骤a)至步骤f)中的每个步骤均在70℃～75℃的温度、转速为250～400转/分的搅拌速度下进行，且每个步骤中加完物料后继续搅拌的时间为5-15分钟。
进一步的，上述步骤a)中云母粉的粒度为10-40目；加入云母粉和水的质量比为1∶8至1∶12。
进一步的，上述步骤b)中加入的HCl的浓度为10％；滴加SnCl4的量是步骤a)中云母粉质量的0.2％-1.0％；滴加SnCl4所用时间为1-2小时。
进一步的，上述步骤c)至步骤f)中调节PH用稀碱均为5％-15％的NaOH。
进一步的，上述步骤c)中加入的TiOCl2溶液的浓度为420g/L，加入速度为45ml/h。
进一步的，上述步聚d)中加入FeCl3溶液的浓度为130g/L，加入速度为45ml/h。
进一步的，上述步骤e)中：滴加AlCl3的量是步骤a)中云母粉质量的2％-8.0％。
进一步的，上述步骤f)中加入ZnCl2的量是步骤a)中云母粉质量的2％-8.0％。
进一步的，上述步骤g)中加入NaSiO3的量为是步骤a)中云母粉质量的2％-8.0％；加入NaSiO3溶液所用时间约1h。
进一步的，上述步骤i)中高耐候金色珠光粉与纯水的质量比为1∶8至1∶12；搅拌的转速为250转-400转/分；加热的温度为70℃～75℃；加入的有机硅偶联剂的量是步骤a)中云母粉质量的1％-2.0％。
本发明方法的先进性在于：
1)生产成本降低，生产效率提高：采用一次包覆耐候珠光粉的工艺，云母包覆SnO2/Fe2O3/TiO2，直接包覆耐候助剂，较之于传统的制备好珠光粉后再投料水解包覆耐候物质，能够缩减工序、提高生产效率、降低能耗和用水量，显著减少中间过程，有效降低成本；
2)提高耐候性能：本发明提供的包覆的方法，包覆的耐候助剂，经过了高温煅烧，能有效的除去结晶水，获得致密的氧化物包膜，而传统的二次包覆耐候物质的普通耐候珠光粉的包覆方法，因为是通过120℃左右温度烘干，表层耐候物质含有大量结水，结合得也不够致密，从而本发明提到包覆方法较之于传统的方法能够有效的提升珠光颜料的耐候性能；本发明方法涉及到ZnO2/SiO2/Al2O3的混合物包膜，通过云母连续包覆SnO2/Fe2O3/TiO2后，再包覆ZnO2/Al2O3/SiO2的混合物，再经过高温煅烧，在Fe2O3/TiO2外层开成致密的保护层，最大限度的提高珠光颜料的耐候性能；较之于传统的1种或2种混合物包膜，珠光颜料的耐候性能增强更加明显；
3)提高了颜料在水性体系中的分散性和稳定性：通过对珠光颜料表面包覆亲水疏油的有机硅偶联剂，对珠光粉进行表面处理，使得珠光粉具有优异的亲水疏油性能，能够有效增强颜颜料的亲水性能，使得珠光颜料在水性树脂系统中，分散更加均匀，沉降更加缓慢，形成的沉淀为软性沉淀，轻摇即可以重新分散到体系中，方便施工，此外有助于形成更加均匀的涂料，增强漆膜的耐水性能；用于水性汽车级涂料。
具体实施方式
为了使本领域技术人员更好地理解本发明，下面结合具体实施方式对本发明作进一步详细说明。
实施例1
取100g 10-40目云母粉投入到2000L烧杯中，加入1000ml纯净水，置于水浴锅中，升温至72℃，调整转速至300转/分，待温度稳定后，用10％的盐酸调整PH值至1.5，待PH值稳定后，2小时滴加入100ml 5g/L的SnCl4溶液，同时滴加液碱溶液保持PH值在1.5，SnCl4滴加完毕后，搅10分钟，再匀速加入420g/L的TiOCl2溶液加料速度为45ml/h，加料至淡金干涉色相，搅10分钟，慢调PH值至3.3，再以45ml/h的均速滴入150g/L的FeCl3溶液RK300金色色相，加完后，搅10分钟，调PH值至5.5，1小时之内滴加150g/L的AlCl3溶液40ml溶液，用碱液保持PH值恒定在5.5，加完搅10分钟，慢调PH值至7.5，1小时之内加入146g/L的ZnCl2溶液40ml，加完搅10分钟，1小时之内加入0.5mol/L的硅酸钠溶液50ml，加完搅10分钟，抽滤、烘干后，800度烧30分钟，即得高耐候金色珠光粉，取100克高耐候珠光粉，投入到2000ml烧杯中，加入纯水1000ml，调整转速至300转/分，升温至72℃，待温度稳定后，一次性加入有机硅偶联剂2ml，搅2小时后，抽滤、烘干后即得高耐候亲水性汽车涂料专用珠光粉。
以上已经描述了本发明的各实施例，上述说明是示例性的，并非穷尽性的，并且也不限于所披露的各实施例。在不偏离所说明的各实施例的范围和精神的情况下，对于本技术领域的普通技术人员来说许多修改和变更都是显而易见的。因此，本发明的保护范围应该以权利要求的保护范围为准。
Claims (11)
1.一种高耐候的水性汽车级涂料专用珠光粉的制备方法，其特征在于，它包括以下步骤：
a)取云母粉投入烧杯中，加入纯水，置于恒温水浴锅中加热，同时搅拌，制得云母浆；
b)向步骤a)制得的云母浆中加入HCl以调整PH值至1.5-1.7，待PH值、温度、转速稳定后，匀速滴加SnCl4溶液，滴加完毕后继续搅拌；
c)用稀碱调整溶液的PH值至2.0，再以一定的加料速度加入TiOCl2溶液，加料至淡金干涉色相，加完继续搅拌；
d)用稀碱慢调PH值至3.3，再以一定的速度滴加FeCl3溶液至RK300金色色相，加完后继续搅拌；
e)用稀碱慢调PH值至5.5，滴加AlCl3，同时加入稀碱保持PH值为5.5，加完后继续搅拌；
f)用稀碱慢调PH值至7.5，然后加入ZnCl2溶液，同时用稀碱保持PH值为7.5，加完后继续搅拌；
g)加入NaSiO3浓液，加完后继续搅拌；
h)将溶液抽滤、烘干后，800℃煅烧30分钟，得到高耐候金色珠光粉；
i)取步骤h)制得的高耐候金色珠光粉投入到烧杯中，加入纯水，搅拌，加热，加入有机硅偶联剂，搅拌约2小时、抽滤、烘干后即得高耐候的水性汽车级涂料专用珠光粉。
2.如权利要求1所述的高耐候的水性汽车级涂料专用珠光粉的制备方法，其特征在于，所述步骤a)至步骤g)中的每个步骤均在70℃～75℃的温度、转速为250～400转/分的搅拌速度下进行，且每个步骤中加完物料后继续搅拌的时间为5-15分钟。
3.如权利要求1所述的高耐候的水性汽车级涂料专用珠光粉的制备方法，其特征在于，所述步骤a)中云母粉的粒度为10-40目；云母粉和水的质量比为1∶8至1∶12。
4.如权利要求1所述的高耐候的水性汽车级涂料专用珠光粉的制备方法，其特征在于，所述步骤b)中加入的HCl的浓度为10％；滴加SnCl4的量是步骤a)中云母粉质量的0.2％-1.0％；滴加SnCl4所用时间为1-2小时。
5.如权利要求1所述的高耐候的水性汽车级涂料专用珠光粉的制备方法，其特征在于，所述步骤c)至步骤f)中调节PH用稀碱均为5％-15％的NaOH。
6.如权利要求1所述的高耐候的水性汽车级涂料专用珠光粉的制备方法，其特征在于，所述步骤c)中加入的TiOCl2溶液的浓度为380-440g/L，加入速度为35-48ml/h。
7.如权利要求1所述的高耐候的水性汽车级涂料专用珠光粉的制备方法，其特征在于，所述步骤d)中加入的FeCl3溶液的浓度为100-160g/L，加入速度为35-48ml/h。
8.如权利要求1所述的高耐候的水性汽车级涂料专用珠光粉的制备方法，其特征在于，所述步骤e)中：滴加AlCl3的量是步骤a)中云母粉质量的2％-8.0％。
9.如权利要求1所述的高耐候的水性汽车级涂料专用珠光粉的制备方法，其特征在于，所述步骤f)中加入ZnCl2的量是步骤a)中云母粉质量的2％-80％。
10.如权利要求1所述的高耐候的水性汽车级涂料专用珠光粉的制备方法，其特征在于，所述步骤g)中加入NaSiO3的量为是步骤a)中云母粉质量的2％-8.0％；加入NaSiO3溶液所用时间约1h。
11.如权利要求1所述的高耐候的水性汽车级涂料专用珠光粉的制备方法，其特征在于，所述步骤i)中高耐候金色珠光粉与纯水的质量比为1∶8至1∶12；搅拌的转速为250转-400转/分；加热的温度为70℃-75℃；加入的有机硅偶联剂的量是步骤a)中云母粉质量的1％-2.0％。
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| CN111995884A (zh) * | 2020-08-27 | 2020-11-27 | 河北欧克新型材料股份有限公司 | 变色珠光颜料的生产工艺 |
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