蜡粉在母粒里主要起分散与加工润滑两个作用：它先润湿颜料或填料表面，帮助其在载体树脂里分散，再在加工时降低熔体粘度。用量没有通用值，通常按载体树脂、颜料/填料比例与载体熔融指数调整。 Wax powder does two jobs in masterbatch: it wets pigment or filler surfaces to help dispersion in the carrier resin, and it lowers melt viscosity during processing. There is no universal dosage — it follows the carrier resin, the pigment or filler loading and the carrier melt index.
蜡粉为什么能改善分散？ Why does wax improve dispersion?
颜料与填料容易团聚，蜡在混料阶段熔融后润湿颗粒表面、降低颗粒间摩擦，使团聚体在剪切下更易被打开。选择时要注意蜡的熔点应低于加工温度、粘度应低于载体树脂。 Pigments and fillers tend to agglomerate. Wax melts during compounding, wets particle surfaces and reduces inter-particle friction, letting shear break the agglomerates. The wax melting point should sit below the processing temperature and its viscosity below that of the carrier.
低分子量聚乙烯蜡和聚酯蜡在母粒里怎么选？ PE wax or polyester wax in masterbatch?
低分子量聚乙烯蜡与载体相容性一般、迁移性强，分散作用明显；聚酯蜡极性与相容性更好，对颜料润湿更快，在要求分散细腻且不影响制品强度的配方里更常见。选择依据是先确定载体树脂，再按润湿速度与相容性挑蜡。 Low molecular weight PE wax has limited compatibility and high migration, giving strong dispersing action. Polyester wax is more polar and compatible and wets pigment faster, so it suits formulations that need fine dispersion without losing part strength. First fix the carrier, then choose by wetting speed and compatibility.
加多了会有什么后果？ What happens with too much wax?
最常见的是制品力学性能下降（冲击、拉伸）与表面析出、印刷或粘接困难。发现这类问题应先减蜡，再判断是否需要换更高分子量或更高熔点的品种。 Most common are reduced mechanical properties (impact, tensile) and surface blooming that spoils printing and bonding. Reduce the wax first, then decide whether a higher molecular weight or higher melting grade is needed.
微粉蜡和颗粒蜡哪个好用？ Micronized or prilled wax?
取决于分散工艺。微粉蜡粒径小、易分散，适合高速混合与要求分散细腻的体系；颗粒蜡（Prills）粉尘小、加料干净，适合自动计量与对粉尘敏感的车间。 It depends on the process. Micronized wax has a small particle size and disperses easily, suiting high-speed mixing and fine dispersion; prills are dust-free and meter cleanly, suiting automatic dosing and dust-sensitive workshops.
对比一览 Comparison
| 蜡种 Wax type | 在母粒中的定位 Role in masterbatch | 注意事项 Watch out for |
|---|---|---|
| 低分子量聚乙烯蜡 Low MW PE wax | 分散剂 + 外润滑 Dispersant + external lubricant | 过量会降低强度、易析出 Overdose lowers strength, blooms |
| 氧化聚乙烯蜡 Oxidized PE wax | 分散 + 极性相容 Dispersion + polar compatibility | 注意对颜色的影响 Check colour contribution |
| 聚酯蜡 Polyester wax | 润湿快、分散细腻 Fast wetting, fine dispersion | 成本相对更高 Higher cost |
| 微粉蜡 Micronized wax | 易分散、适合高速混 Easy dispersion, high-speed mixing | 粉尘控制 Dust control |
| 颗粒蜡 Prills Prills | 无尘加料、易计量 Dust-free dosing | 需足够剪切才分散开 Needs enough shear to disperse |
常见问题 FAQ
母粒里蜡的用量一般是多少？ What is the typical wax loading?
没有通用值。它随载体树脂种类、颜料或填料比例、载体熔融指数变化，通常先按小试确定分散效果与力学性能，再逐步优化到最低有效用量。 There is no universal figure. It varies with carrier resin, pigment or filler loading and carrier melt index. Determine dispersion and mechanical properties in a lab trial, then optimise down to the minimum effective level.
为什么加了蜡还是分散不好？ Why is dispersion still poor with wax?
常见原因是蜡熔点与加工温度不匹配（熔点过高不熔、过低提前挥发）、剪切不足，或颜料本身未经表面处理。应逐项排查，而不是继续加蜡。 Usual causes: wax melting point mismatched to processing temperature (too high it never melts, too low it evaporates), insufficient shear, or untreated pigment. Check each rather than adding more wax.
填充母粒和色母粒用蜡一样吗？ Is the wax the same for filler and colour masterbatch?
不完全一样。填充母粒填料比例高、侧重流动性与分散；色母粒更看重颜料润湿与颜色展现。前者常用低分子量聚乙烯蜡，后者按颜料极性选择。 Not exactly. Filler masterbatch is highly loaded and emphasises flow and dispersion; colour masterbatch emphasises pigment wetting and colour development. The former often uses low MW PE wax, the latter chooses by pigment polarity.
蜡会影响母粒的熔融指数吗？ Does wax change the masterbatch melt index?
会。低分子量蜡会提高熔体流动，表现为熔融指数上升。这是它改善加工流动性的原因，也是加量过多导致强度下降的原因。 Yes. Low molecular weight wax raises melt flow, so the melt index goes up. That is how it improves processability — and also why overdosing costs strength.
参考资料 References
本页内容用于选型参考，具体指标以该批次的 COA 与 TDS 为准。