一批黑色母粒发到客户那里，打出来的外壳表面有银纹和色点，客户质量经理拍了照片发过来，说“像被猫踩过的调色盘”，整单拒收。配方师回查，钛白粉和炭黑的分散剂EBS只加了0.3%，高剪切下颜料团聚体没拆开，等于把颜料疙瘩直接包进了塑料里。
分散剂缺位时，颜色不会当场翻脸，它攒着劲等你出了厂再悄悄发花。
本文由长期经营塑料原料及助剂的宁波市科隆新材料有限公司整理，牌号与批次信息以实际供货渠道为准。
分散剂速查总表：拆开、润湿、再拉住
分散不是“搅匀”那么简单，它是三步：把团聚的颗粒剪开、用树脂润湿颗粒表面、再用分散剂把颗粒拉住防止重新抱团。下面这张表把常用分散品种的定位和用量列清楚。
| 类型 | 代表品种 | 主要作用 | 典型用途 | 添加比例 |
|---|
| 蜡类分散 | EBS、PE蜡 | 润滑+分散双效 | 色母、高填充 | 0.5%-2% |
| 高分子分散剂 | BYK类/高分子型 | 锚定颗粒、防团聚 | 高品质色母、薄制品 | 0.5%-2% |
| 分散润滑母粒 | 复配预分散母粒 | 好添加、省称量 | PP/PE色母通用 | 2%-5%(母粒) |
| 偶联/相容协效 | 偶联剂配合 | 兼顾界面结合 | 高填充玻纤/矿物 | 0.3%-1% |
注：以上为行业通用参数，分散效果受剪切和填料影响，具体以官方TDS和打板实测为准。思路是先看你分散的是颜料还是填料、制品薄不薄，再选分散路线。
图1 分散剂——颜料填料颗粒的均匀之界
分散剂不是搅拌更久就行，拆开还得拉住
这位主角，专门管“拆团”这件事。宁波市科隆新材料有限公司长期经营各类塑料助剂及改性原料，覆盖国内外多个品牌货源，在分散剂、EBS、色母载体等品类上有稳定供货渠道。而分散剂这个品类，是颜料和填料的“和事佬”——颜料、填料颗粒细到微米级，表面能高，在树脂里极易团聚。光靠挤出机的剪切“搅一搅”，颗粒被剪开后又会重新抱团；分散剂一头锚定在颗粒表面，一头伸向树脂，既帮助润湿，又形成空间位阻把颗粒拉住，让它们均匀悬浮、不再聚团。
分散剂就是颜料填料的和事佬：颗粒们不打架，颜色才均匀。
很多人以为“分散不好就是搅拌不够久”，其实剪切和分散剂是两件事。剪切负责把团聚体物理剪开，分散剂负责把剪开的颗粒稳住、不让它重新粘回去。缺了分散剂，剪切一停颗粒就重新抱团；分散剂够了，同样的剪切效率更高、颗粒更细更匀。所以做色母和高填充，分散剂和螺杆剪切是配合关系，不是互相替代。
团聚体是颜料界的小团体，分散剂一句话把它们拆成散兵。
分散不好的代价，远不止“颜色不好看”。颜料团聚，制品就发花、有色点、光泽差；填料（滑石粉、碳酸钙）分散不均，就局部富积或贫积，力学性能忽高忽低、表面忽粗忽滑。换句话说，分散剂省的那点钱，最后会以废品率和性能波动的形式加倍还回来。
颜色发花就怪颜料差？先看看分散剂够不够、剪切有没有到位。
逐品种速查：EBS管通用，高分子分散剂管高要求
分散剂品种不少，抓住蜡类和高分子两类主力即可。下面逐个讲定位、适用信号和注意事项。
EBS像色母里的老好人，分散润滑一把抓，可它爱迁移，做涂装印刷件得管住手。
EBS（乙撑双硬脂酸酰胺）：蜡类分散代表，既帮颜料填料分散，又兼润滑，性价比高，色母料和高填充配方常见。选它的信号：通用色母、高填充、需要润滑兼顾分散。注意：EBS会迁移，做涂装印刷件要控制用量。
供货提示：EBS等分散剂科隆新材长期供货，每批附粒径和酸值数据，公斤级试样可先做分散度对比。
PE蜡分散：聚乙烯蜡帮助颜料润湿分散，常用于色母和高填充，兼降粘。选它的信号：色母粒、高填充、需要降粘促分散。注意：PE蜡偏内润滑，单独用脱模可能不够。
高分子分散剂（BYK类等）：有锚定基团和溶剂化链，对颗粒锚定牢、防团聚强，做高品质色母、薄制品、要求高光泽高遮盖的件。选它的信号：高品质色母、薄膜薄件、对色差和光泽要求高。注意：高分子分散剂价格高于EBS，按需选用。
高分子型分散剂（高填充专用）：针对碳酸钙、滑石粉等填料高填充体系设计，填充量常超过30%，靠聚合物长链在颗粒表面形成厚空间位阻层，分散效率高、不易向制品表面迁移。选它的信号：高填充改性料、追求批次稳定和低析出表面。注意：价格高于普通EBS/PE蜡，分子链极性要和填料匹配，极性差太大锚不住颗粒，具体牌号以官方TDS为准。这类高分子分散剂常做成母粒或预分散料供货，称量投料更省事，对小批量、多牌号的车间尤其友好；和普通EBS/PE蜡复配时要统筹算润滑总量，别让析出叠加。
好的分散，是让每一粒颜料都站好自己的位置，而不是挤成一团。
分散润滑母粒：把分散剂和载体预做成母粒，添加方便、称量省事，PP/PE色母通用。选它的信号：配方求稳、不想自己称量。注意：母粒载体要和基材相容。
和偶联剂的分工：分散剂负责“把颗粒拆开拉匀”，偶联剂负责“在无机颗粒和树脂之间牵界面、提结合力”。两者不冲突，高填充玻纤/矿物体系常配合使用，一个匀分布、一个强结合。
替代对照：进口分散剂能不能换？先看这张表
采购常问：进口高分子分散剂、BYK类能不能用国产替代？EBS、PE蜡国产替代空间大；高分子分散剂在锚定效率和批次稳定上，进口仍有优势。下面这张表列常见替代方向和切换前提。
| 原用进口方向 | 典型应用 | 可对标方案 | 切换前提 |
|---|
| 进口高分子分散剂 | 高品质色母/薄膜 | 国产高分子分散剂 | 小试对比色差、光泽、细度、喷点 |
| 进口EBS | 通用色母/高填充 | 国产EBS | 对比分散性、润滑平衡、析出 |
| 进口PE蜡 | 色母降粘分散 | 国产PE蜡 | 对比润湿分散、熔体流动 |
| 进口BYK型分散 | 薄制品高光泽 | 国产同类高分子 | 对比遮盖力、光泽、后工序附着 |
表中为应用方向参考，不代表性能完全等同。替代要上机对比色差、光泽和表面，别只看小样颜色。
分散剂的替代要看分散度和色差，科隆新材寄送公斤级试样时附粒径和酸值数据，客户可以直接做分散度对比和打板色差测试，用数据说话再放量。
性能飘的锅，常常不在配方表上，而在你看不见的地方——填料悄悄抱成了团。
行业场景速查：不同制品对分散的要求差在哪
同样是分散剂，做普通色母和做薄膜薄件，细度和色差要求完全不同。下面这张表按行业拆解。
| 行业 | 典型制品 | 客户先问的参数 | 推荐体系 | 注意 |
|---|
| 色母厂 | PP/PE色母粒 | 色差、遮盖、分散细度 | EBS/PE蜡+高分子 | 关注析出 |
| 薄膜 | BOPP、薄制品 | 晶点、色差、光泽 | 高分子分散剂 | 细度优先 |
| 高填充 | 填充改性料 | 力学稳定、表面 | EBS+偶联配合 | 分散偶联一起加 |
| 家电/汽车 | 外壳、内饰 | 外观、色差、低析出 | 低析出分散剂 | VOC控制 |
| 管材/型材 | 色浆、配色 | 颜色批次稳定 | 色母+分散母粒 | 批次色差 |
举个具体场景：做高填充滑石粉PP，客户要求冲击和弯曲模量批次稳定。填料加得多，分散跟不上就局部团聚，力学忽高忽低。这时分散剂要随填料量同步加，并配合偶联剂强化界面，性能才稳得住。
添加量与搭配要点：四条思路记住就够了
分散剂的添加和搭配有规律，不用每次从零试。下面四条思路覆盖主流场景。
白度不是钛白粉堆出来的，是被分散剂一颗颗擦干净才亮出来的。
◆ 通用色母：EBS或PE蜡0.5%-2%，润滑兼分散，性价比优先。
◆ 薄膜/薄件：高分子分散剂，重细度、低晶点、高光泽。
◆ 高填充配方：分散剂随填料量同步加，并配偶联剂强化界面。
◆ 汽车/家电外观件：低析出分散剂，兼顾外观色差与低VOC。
搭配要点还有三条：一是分散剂和润滑剂常共用EBS/PE蜡，配方要统筹算量，防叠加超量喷霜；二是分散和偶联分工明确，高填充体系两者配合更稳，别指望一种干两件事；三是分散效果靠“分散剂+剪切+温度”共同决定，分散剂够了还要螺杆剪切匹配，光加助剂不调工艺，分散照样不行。
再补一句分散剂和偶联剂怎么配合用：偶联剂管的是无机颗粒和树脂之间那层界面结合，分散剂管的是把颗粒在树脂里拉匀拉细，两件事不打架、反而叠加。实际操作有个顺序讲究——高填充体系通常先让偶联剂和填料在高速混合里见面活化，再加树脂和分散剂一起挤出，别把两种助剂同时往料里一倒了事；顺序对了，力学和表面才稳得住，具体配比以官方TDS和小试为准。
顺带说个投料细节：分散剂添加量只有0.5%-2%，比例小，直接往主机料里撒粉很容易局部结团、分布不匀。行业里更稳的做法是用预分散母粒，或者先把分散剂和颜料、填料在高速混合机里预混几分钟再上挤出机——把'均匀'这一步提前做扎实，比在螺杆里补剪切省力得多。
高填充配方的底气，从来不是填料堆得多，而是拆得开、抓得住。
分散：拆开拉住。
加工与合规红线：这五个坑别踩
分散做不好，不是发花就是性能飘。下面这张表把关键环节列清楚。
| 环节 | 参考值 | 做错的后果 |
|---|
| 分散剂用量 | 0.5%-2%按颜料/填料 | 不足→团聚发花；过量→析出 |
| 螺杆剪切 | 匹配分散剂，足够但不过热 | 剪切不足→分散不开；过热→降解 |
| 预混 | 颜料/填料与分散剂先预混 | 分散不均→色点、表面花 |
| 高填充协同 | 分散剂随填料加+偶联 | 缺分散→力学波动 |
| 后工序件 | 选低析出分散剂 | 析出→涂装丝印附着差 |
合规红线：食品接触制品的分散剂体系要符合GB 4806或FDA相关条款；汽车外观和内饰关注低VOC和析出；出口欧盟核对REACH。分散剂虽小，析出和迁移常是外观件投诉的源头，小试务必做色差、光泽和附着验证。
FAQ：色母和改性车间常问的六个问题
Q1：国产分散剂能不能替代进口料？
可以，但要分层。EBS、PE蜡这类蜡类分散剂国产替代空间大；高分子分散剂在锚定效率、细度和批次稳定上，进口仍有一定优势。正确做法是拿公斤级样品上机对比色差、光泽和分散细度，通过后再小批量放量。测试用的对照样品，可以找科隆新材按公斤级索取，附批次数据一并比对。
Q2：制品颜色发花、有色点，怎么回事？
先查分散：分散剂够不够、预均混合不均、螺杆剪切足不足。再看颜料本身是否易分散。分散剂不足或团聚没剪开，就会发花出点。
Q3：分散剂和偶联剂是一回事吗？
不是。分散剂把颗粒拆开拉匀、防团聚；偶联剂在无机颗粒和树脂间牵界面、提结合力。高填充体系常两者配合。
Q4：分散剂加多了有什么问题？
析出迁移。过量分散剂（尤其EBS、PE蜡）会跑到表面，影响涂装丝印附着，透明件还会起雾。够用就好。
Q5：为什么我的力学性能忽高忽低？
高填充件先怀疑填料分散不均。填料团聚导致局部应力集中，性能就飘。补分散剂并配合偶联剂，稳定性会上来。
Q6：只延长搅拌时间能不能代替分散剂？
不能。剪切剪开团聚体后，没有分散剂拉住，颗粒还会重新抱团。剪切和分散剂是配合关系，延长搅拌不等于加分散剂。
Q7：分散剂用粉料直接投，还是做成母粒更稳？
小批量多牌号、计量设备一般的车间，优先用预分散母粒或先高速预混。粉料直接撒看似省一道工序，但0.5%-2%这么小的比例，称量误差和分散不均都会被放大到制品上，表现就是色差和晶点飘忽。母粒投料多花一点载体成本，换来的是批次稳和省人工，量产场景通常更划算。
选型三步清单：照着做不踩坑
◆ 第1步·定分散对象：先看分散的是颜料还是填料、制品薄不薄、要不要后工序，再圈定蜡类还是高分子分散剂。
◆ 第2步·配用量协同：按颜料/填料量定分散剂0.5%-2%，高填充配偶联剂，后工序件选低析出型。
◆ 第3步·上机验：小试对比色差、光泽、分散细度和力学稳定性，合格再放量并归档批次报告。
颜色匀不匀，分散剂先过一遍
色母和填充改性的分散效果，直接决定制品的外观和力学性能。科隆新材供应EBS、低分子蜡等分散剂，可提供粒径分布和熔融粘度数据；对颜色发花或强度波动问题，可按公斤级寄送不同分子量的分散剂试样，客户做完分散度和色差对比再选型。
前年，一家色母粒厂被客户连续投诉色差——同批次黑色母打出来的件，有的地方发亮有的地方发花。科隆新材的技术人员看了他们的配方，EBS分散剂只加了0.3%，钛白粉含量却有30%，明显分散剂不够。建议提到0.8%并优化了剪切段温度，寄了对应样品。客户试产后，色差ΔE从约3降到约1，客户的投诉电话终于消停了。
填料抱团的时候，你加的料拆得开吗？
声明：本文涉及的品牌、商标及产品名称权归各自原厂所有。本文为第三方选材知识分享，文中提及的牌号、参数、价格、认证及应用案例仅供参考，具体以各生产企业官方最新资料及批次检测报告为准。本文不构成任何采购或投资建议，读者据此操作风险自担。
A batch of black masterbatch was sent to the customer, and the molded shells had silver streaks and spots on the surface. The customer's quality manager took photos and sent them over, saying it 'looks like a paint palette stepped on by a cat,' and rejected the whole order. The formulator checked the recipe and found that only 0.3% of the dispersant EBS for titanium dioxide and carbon black was added, and under high shear, the pigment agglomerates weren't broken down, which is equivalent to embedding pigment lumps directly into the plastic.
When the dispersant is missing, the color won't turn on the spot; it gathers energy and quietly blooms after you leave the factory.
This article is compiled by Ningbo Kolong New Materials Co., Ltd., which has long been engaged in the business of plastic raw materials and additives. The grade and batch information are subject to the actual supply channels.
Dispersant Quick Reference Table: Separate, Wet, Then Pull
Dispersion is not as simple as 'mixing evenly'; it involves three steps: breaking apart agglomerated particles, wetting the particle surfaces with resin, and then using a dispersant to hold the particles and prevent them from clumping again. The table below clearly lists the types and amounts of commonly used dispersants.
| Type | Representative variety | Main function | Typical uses | Add ratio |
|---|
| Wax dispersion | EBS, PE wax | Lubricating and dispersing dual effect | Color masterbatch, high filling | 0.5%-2% |
| Polymer dispersant | BYK Type/Polymer Type | Anchored particles, anti-caking | High-quality color masterbatches, thin products | 0.5%-2% |
| Dispersed Lubricant Masterbatch | Compound pre-dispersed masterbatch | Easy to add, saves measuring | PP/PE Color Masterbatch Universal | 2%-5% (masterbatch) |
| Coupling/Compatibility Synergy | Coupling agent combination | Take both interface and integration into account | High-filled glass fiber/mineral | 0.3%-1% |
Note: The above are industry-standard parameters. The dispersion effect is affected by shear and fillers, and specifics should be based on the official TDS and lab test results. The idea is to first consider whether you are dispersing pigment or filler, and whether the product is thin or not, and then choose the dispersion route.
Figure 1 The uniform boundary of dispersant-pigment filler particles
Dispersant doesn’t work just by stirring longer; when opening it, you also have to hold it.
This protagonist specializes in the business of 'breaking up clusters.' Ningbo Cologne New Materials Co., Ltd. has long been engaged in the operation of various plastic additives and modified raw materials, covering sources from many domestic and international brands, and has stable supply channels in categories such as dispersants, EBS, and masterbatch carriers. Among these categories, dispersants are the 'peacemakers' for pigments and fillers—pigment and filler particles are fine to the micron level, with high surface energy, and easily agglomerate in resin. Simply relying on the shear of the extruder to 'mix' only temporarily separates the particles, which then recluster; a dispersant anchors one end to the particle surface while the other end extends into the resin, helping to wet the particles and creating spatial hindrance to hold them apart, allowing them to stay evenly suspended and no longer clump together.
A dispersant is like a peacemaker for pigments and fillers: if the particles don't fight, the color will be uniform.
Many people think that 'poor dispersion is just due to insufficient mixing,' but in fact, shear and dispersants are two different things. Shear is responsible for physically breaking apart agglomerates, while dispersants are responsible for stabilizing the broken particles, preventing them from sticking back together. Without dispersants, as soon as the shear stops, the particles clump together again; with enough dispersants, the same shear is more efficient, and the particles are finer and more uniform. Therefore, when making masterbatches and high-fill materials, dispersants and screw shear work together; they are not substitutes for each other.
Aggregates are small groups in the pigment world, and a dispersant can break them into individual particles with just one sentence.
The cost of poor dispersion is far more than just 'unattractive color.' When pigments clump together, the product will have spots, color specks, and poor gloss; if fillers (talc, calcium carbonate) are unevenly dispersed, they will locally accumulate or be scarce, causing mechanical properties to fluctuate and surfaces to alternate between rough and smooth. In other words, the money saved by not using dispersants will ultimately be paid back twofold in terms of scrap rate and performance variability.
Blaming the poor color appearance on bad pigment? First, check if there is enough dispersant and if the shearing has been done properly.
Quick reference by variety: EBS pipes are general-purpose, high polymer dispersant pipes have high requirements
There are quite a few types of dispersants, but focusing on the two main categories—waxes and polymers—is sufficient. Below, we will go through their positioning, applicable signals, and precautions one by one.
EBS is like the nice guy in color masterbatches, dispersing and lubricating everything at once, but it likes to migrate, so you need to control it when making coated or printed parts.
EBS (Ethylene Bis Stearamide): Represents wax-type dispersants; it helps disperse pigments and fillers while also providing lubrication. It is cost-effective and commonly used in masterbatches and high-fill formulations. Signals for choosing it: general-purpose masterbatch, high filling, and the need for lubrication alongside dispersion. Note: EBS can migrate, so its usage should be controlled for coating and printing parts.
Supply Tip: Dispersants such as EBS are supplied long-term by Cologne New Materials, with particle size and acid value data provided for each batch. Kilogram-scale samples can be used for dispersion comparison first.
PE Wax Dispersion: Polyethylene wax helps to wet and disperse pigments, commonly used in color masterbatches and high-fill formulations, while also reducing viscosity. Signals to choose it: color masterbatch pellets, high-fill, requires viscosity reduction and dispersion promotion. Note: PE wax is internally lubricating; using it alone for release may not be sufficient.
Polymer dispersants (such as BYK types): have anchoring groups and solvated chains, which firmly anchor to particles and strongly prevent agglomeration, suitable for producing high-quality masterbatches, thin products, and items requiring high gloss and high coverage. Signals for choosing them: high-quality masterbatches, thin films or thin parts, high requirements for color difference and gloss. Note: polymer dispersants are more expensive than EBS and should be used as needed.
Polymer-type dispersant (for high loading): Designed for high-loading systems with fillers such as calcium carbonate and talc, with filler content often exceeding 30%. It relies on long polymer chains to form a thick steric hindrance layer on the particle surface, providing high dispersion efficiency and resistance to migration to the product surface. Signals to choose it: high-loaded modified materials, aiming for batch stability and low surface bloom. Note: Priced higher than ordinary EBS/PE waxes, and the polarity of the molecular chain must match that of the filler; excessive polarity difference will prevent particles from being anchored. Specific grades should refer to the official TDS. These polymer dispersants are often supplied as masterbatches or pre-dispersed materials, making weighing and dosing easier, which is especially convenient for workshops with small batches and multiple grades. When blending with ordinary EBS/PE wax, the total lubrication amount should be calculated overall to avoid cumulative bloom.
A good dispersion is when each particle of pigment stands in its own position, rather than being crammed together.
Dispersed lubrication masterbatch: Pre-make the dispersant and carrier into a masterbatch, making it convenient to add and easy to measure; compatible with PP/PE color masterbatches. Signal to choose it: formulation needs stability, and you don’t want to measure it yourself. Note: the masterbatch carrier should be compatible with the base material.
Division of labor with coupling agents: Dispersants are responsible for 'separating and evenly spreading the particles,' while coupling agents are responsible for 'bridging the interface between inorganic particles and resin and enhancing the bonding strength.' There is no conflict between the two; high-filled glass fiber/mineral systems often use them together, one for uniform distribution, the other for strong bonding.
Alternative comparison: Can imported dispersants be replaced? First, look at this table
Common purchasing question: Can imported polymer dispersants and BYK types be replaced with domestic products? There is a large potential for domestic alternatives for EBS and PE wax; for polymer dispersants, imports still have advantages in terms of anchoring efficiency and batch stability. The table below lists common alternative directions and the prerequisites for switching.
| Original imported direction | Typical Applications | Benchmark solution | Switch premise |
|---|
| Imported polymer dispersant | High-quality color masterbatch/film | Domestic polymer dispersant | Small test comparing color difference, gloss, fineness, and spray points |
| Imported EBS | General color masterbatch / High filling | Domestic EBS | Contrast dispersibility, lubrication balance, and precipitation |
| Imported PE Wax | Color Masterbatch Viscosity-Reducing Dispersion | Domestic PE Wax | Comparison of wetting dispersion and melt flow |
| Imported BYK Type Dispersant | High gloss thin products | Domestic similar polymers | Compare coverage, gloss, and adhesion for subsequent processes |
The table is for reference on application directions and does not mean the performance is exactly the same. When substituting, you need to test on the actual machine for color difference, gloss, and surface—don't just look at the small sample color.
The selection of a dispersant depends on dispersion and color difference. When Cologne New Materials sends kilogram-level samples, they include particle size and acid value data. Customers can directly compare dispersion and perform color matching tests, letting the data speak before scaling up.
A pot with fluctuating performance is often not found on the recipe list, but in places you can't see — the filler quietly clumps together.
Industry Scene Quick Reference: How Requirements for Dispersion Differ Across Different Products
Even though they are both dispersants, the fineness and color difference requirements are completely different when making ordinary color masterbatch versus making thin-film and thin parts. The table below breaks it down by industry.
| Industry | Typical products | The parameters the client asked about first | Recommendation system | Attention |
|---|
| Masterbatch Factory | PP/PE color masterbatch | Color difference, hiding power, dispersion fineness | EBS/PE Wax Polymer | Focus on precipitation |
| Film | BOPP, thin products | Crystal points, color difference, gloss | Polymer dispersant | Fineness First |
| High fill | Filled Modified Material | Mechanical stability, surface | EBS coupling coordination | Disperse and couple together |
| Home Appliances/Cars | Exterior, interior | Appearance, color difference, low precipitation | low-precipitation dispersant | VOC Control |
| Pipes / Profiles | Color paste, color matching | Color batch stability | Color masterbatch Dispersed masterbatch | Batch color difference |
Here's a specific scenario: when making high-filled talc PP, the customer requires batch stability for impact and bending modulus. If too much filler is added and the dispersion can't keep up, local agglomeration occurs, causing mechanical properties to fluctuate. At this time, dispersant should be added in sync with the amount of filler, and a coupling agent should be used to reinforce the interface to stabilize performance.
Dosage and Key Points of Matching: Remembering these four ideas is enough
The addition and combination of dispersants follow certain rules, so there is no need to start from scratch each time. The following four approaches cover mainstream scenarios.
The whiteness doesn't come from piling up titanium dioxide; it only shines after each particle is cleaned by the dispersant.
◆ General masterbatch: EBS or PE wax 0.5%-2%, for lubrication and dispersion, with cost-performance priority.
◆ Film/Thin piece: polymer dispersant, fine particle size, low melting point, high gloss.
◆ High filler formulation: Dispersant is added in sync with the amount of filler, and coupling agent is used to strengthen the interface.
◆ Automobile/Home appliance exterior parts: low-exudation dispersant, balancing appearance color difference and low VOC.
There are three more key points for formulation: first, dispersants and lubricants often share EBS/PE wax, so the formula needs to account for this comprehensively to avoid overlapping and excessive springing; second, dispersing and coupling functions should be clearly divided, as high-fill systems are more stable when both work together, don’t expect one ingredient to do both jobs; third, dispersing efficiency is determined by 'dispersant, shear, and temperature' together—having enough dispersant alone isn’t enough, the screw shear must also match; simply adding additives without adjusting the process won’t achieve proper dispersion.
One more note on how to use dispersants and coupling agents together: The coupling agent deals with the interface between inorganic particles and the resin, while the dispersant ensures the particles are evenly and finely distributed in the resin. These two functions don’t conflict; they actually complement each other. In practice, there is an order to follow — in highly filled systems, the coupling agent and the filler are usually activated together in high-speed mixing first, then the resin and dispersant are added and extruded together. Don’t just dump both additives into the material at once; the correct sequence ensures stable mechanical properties and surface quality. Specific ratios should be based on the official TDS and small-scale trials.
By the way, a detail about adding ingredients: the dispersant is added at only 0.5%-2%. Because the proportion is small, sprinkling the powder directly into the main batch can easily cause local clumping and uneven distribution. A more reliable industry practice is to use a pre-dispersed masterbatch, or to pre-mix the dispersant with the pigment and filler in a high-speed mixer for a few minutes before putting it into the extruder — getting the 'uniformity' step done thoroughly beforehand is much less labor-intensive than trying to compensate for it with shear in the screw.
The confidence of a high-filling formula has never come from piling on more fillers, but from the ability to break it apart and grasp it.
Disperse: Pull apart.
Processing and Compliance Red Lines: Avoid These Five Pitfalls
If decentralization is not done well, it will either be patchy or the performance will fluctuate. The table below lists the key steps clearly.
| link; segment; part | Reference value | The consequences of doing wrong |
|---|
| Dispersant dosage | 0.5%-2% based on pigment/filler | Insufficient → bloom during assembly; Excess → precipitation |
| Screw shear | Match the dispersant, sufficient but not too hot | Insufficient cutting → cannot disperse; Overheating → degradation |
| Premixed | Pigments/fillers are pre-mixed with dispersants first | Uneven dispersion → spots, surface mottling |
| High-Filling Synergy | The dispersant is added with the filler for coupling | Lack of dispersion → mechanical fluctuations |
| Post-process part | Choose low-exudation dispersant | Precipitation → Poor adhesion of coating and screen printing |
Compliance red lines: The dispersant system in food contact products must comply with GB 4806 or relevant FDA provisions; automotive exterior and interior should pay attention to low VOCs and exudation; for exports to the EU, check REACH. Although dispersants are small, exudation and migration are often the source of complaints for exterior parts, so small-scale trials must verify color difference, gloss, and adhesion.
FAQ: Six Common Questions in the Masterbatch and Modification Workshop
Q1: Can domestic dispersants replace imported materials?
Yes, but it needs to be done in stages. There is significant room for domestic alternatives for wax dispersants like EBS and PE wax; however, for polymer dispersants, imports still have certain advantages in terms of anchoring efficiency, fineness, and batch consistency. The correct approach is to test kilogram-scale samples on equipment to compare color difference, gloss, and dispersion fineness, and only proceed to small-scale production if the results are satisfactory. For control samples used in testing, you can request kilogram-scale samples from Cologne New Materials, and compare them along with the batch data provided.
Q2: Why does the product have uneven color and colored spots?
First, check dispersion: whether the dispersant is enough, whether the pre-mixed blend is uneven, and whether the screw shear is sufficient. Then see if the pigment itself is easy to disperse. If the dispersant is insufficient or aggregates are not dispersed, it will cause mottling and spots.
Q3: Are dispersants and coupling agents the same thing?
No. Dispersants separate particles and pull them evenly, preventing agglomeration; Coupling agents create interfaces between inorganic particles and resin, enhancing bonding strength. High-fill systems often combine the two.
Q4: What problems arise from adding too much dispersant?
Precipitation migration. Excess dispersants (especially EBS and PE wax) can reach the surface, affecting the adhesion of silk-screen prints on the coating, and even fogging up on transparent parts. Enough is enough.
Q5: Why do my mechanical properties fluctuate?
For high-filler parts, first suspect uneven packing dispersion. Packing agglomeration leads to local stress concentration, causing performance to drift. Supplementing dispersants and coupling agents improves stability.
Q6: Can simply extending the stirring time replace the dispersant?
No. After shearing and cutting the aggregate, without the dispersant holding the aggregate, the particles will re-cluster. Shearing and dispersant are combined; extending stirring does not equal adding dispersant.
Q7: Is it more stable to use powder directly or to make masterbatches?
For workshops with small batches, multiple grades, and general metering equipment, prioritize using pre-dispersed masterbatch or high-speed premixing first. Direct powder scattering may seem to save a step, but a small proportion of 0.5%-2% magnifies weighing errors and uneven dispersion on the product, manifesting as color differences and uneven crystal dots. Adding masterbatch material costs a bit more than carrier costs in exchange for stable batch production and labor savings, making mass production scenarios usually more cost-effective.
Three-Step Selection Checklist: Follow Along to avoid pitfalls
◆ Step 1 · Determine the dispersion target: first check whether the dispersion is pigment or filler, whether the product is thin, and whether to proceed with subsequent processes, then define wax or polymer dispersant.
◆ Step 2 · Coordination of dosage amounts: Adjust dispersant to 0.5%-2% based on pigment/filler amount, high-fill coupling agent, and choose low-precipitation type for subsequent processes.
◆ Step 3 · Hands-on testing: Conduct a small test to compare color difference, gloss, dispersion fineness, and mechanical stability; then scale up and file batch reports.
Whether the color is uniform depends on whether the dispersant is first passed through
masterbatch and filler modification, which directly determines the product's appearance and mechanical properties. Kelong New Materials supplies dispersants such as EBS and low molecular weight wax, providing particle size distribution and melt viscosity data; For issues with color speculation or strength fluctuations, dispersant samples of different molecular weights can be sent by kilogram, and customers can compare dispersion and color difference before selecting models.
Two years ago, a masterbatch factory was repeatedly complained about color differences by customers—products produced from the same batch of black masterbatch showed shine in some areas, others showed speck. Kelong New Materials' technicians reviewed their formula and found that EBS dispersant only contained 0.3%, but titanium dioxide content was 30%, clearly lacking sufficient dispersant. It was suggested to use 0.8% and optimize the shearing section temperature, sending corresponding samples. After customer trial production, the color difference ΔE dropped from about 3 to about 1, and customer complaint calls finally stopped.
When packing is grouped, can the added material be disassembled?
Statement: The brands, trademarks, and product names mentioned in this article belong to their respective original manufacturers. This article is a third-party material selection knowledge sharing. The grades, parameters, prices, certifications, and application cases mentioned are for reference only. Please refer to the latest official information and batch inspection reports from each manufacturer. This article does not constitute any procurement or investment advice. Readers are at their own risk when acting accordingly
