一车再生PP拉到车间，造粒一开机，一股子塑料味、油酸味冲出来，操作工直捂鼻子。注塑成汽车内饰件，客户拿鼻子一闻，直接说气味等级超标，整车厂内饰要求VDA 270气味测试，这股味根本过不了。好好的再生料，因为一股味只能当低价杂料卖。
再生料头疼的两件事，一是味，二是水。味大了客户不要、卖不上价；水分高了制品起银纹、气泡，还助着分解产味。这一篇讲除味吸湿剂怎么把这两个隐形杀手一起治，让异味料也能卖上价。
先上一张除味吸湿剂速查总表，把主流品种、关键参数、典型制品和添加范围列清楚。
| 体系 | 代表品种 | 关键参数/特性 | 典型制品 | 添加比例 |
|---|
| 吸附型 | 沸石分子筛 | 多孔吸附VOC、醛类 | 再生PP/PE内饰 | 1%-4% |
| 化学除味 | 除醛/除味母粒 | 分解醛、硫、胺类 | 汽车内饰、家电 | 1%-3% |
| 吸湿型 | 活性硅酸盐/分子筛母粒 | 吸残余水分、防银纹 | PA/PET再生料 | 1%-3% |
| 复合型 | 吸附+分解+吸湿 | 除味干燥一起干 | 高异味再生料 | 2%-5% |
| 活性炭型 | 载炭母粒 | 强吸味、浅色可用浅色款 | 深色再生制品 | 1%-4% |
注：以上为行业通用范围，具体牌号与除味效果以厂家TDS及气味等级实测为准；吸湿母粒不能替代预干燥。
再生料卖不上价，差的常常不是性能，是那股挥不掉的味
先把一个账算明白：再生料便宜，本来是它的优势，可一股味把这个优势全吞了。新料做的内饰件无味、过气味测试，能卖内饰级价；同一堆再生料，性能差不多，就是有味，客户闻一下就压价，从内饰级跌到杂料级，一吨差好几千。
这股味哪来的？再生料在回收、加工、储存过程中，树脂热氧降解产生醛类，残留的油污、助剂分解出硫化物、胺类，再加上料里吸的水分——这些小分子就是VOC和气味的来源。你不把它抓走、拆掉，料再怎么便宜也进不了内饰、家电这些对气味敏感的门。
宁波市科隆新材料有限公司长期经营各类再生原料及助剂，在再生PP、再生PE和除味母粒、吸湿母粒上有稳定货源。除味吸湿剂这个品类，一套是物理吸附——用沸石分子筛、活性炭把VOC小分子吸住；一套是化学分解——把醛类、硫化物、胺类这些臭味分子反应成无味的东西。科隆新材按再生料的异味程度推荐搭配，试样按公斤级发，附气味等级对比数据。
再生料的异味，是报价单上最隐形的那一刀。
图1 除味母粒吸附分解异味分子的示意
除味剂干的事，是把臭味分子抓走、拆成无味
机理说人话。除味不是往料里喷香精盖味——那是掩耳盗铃，温度一高香味没了，臭味又冒出来。正经的除味母粒干两件事：一是像海绵一样吸附，沸石分子筛浑身是微孔，把料里跑出来的VOC小分子吸进去；二是像清洁剂一样分解，里面的活性基团跟醛、硫、胺这些臭味分子反应，把它们拆成没味的东西。
水分也是帮凶。再生料吸了潮，加工时水遇热成汽，制品表面起银纹、内部起气泡，水还帮着树脂分解产味。所以除味母粒里常复配吸湿成分，把残余水分也带走。但要讲清楚：吸湿母粒是辅助，替代不了正规预干燥，PA、PET这种亲水料该烘干还得烘干。
有文献数据可参考：再生料里加4%左右沸石类除味剂，异味强度能比没加的降大约45%。汽车内饰用的低气味再生PP配方里，复合除味剂常占到3-8份。这个量级下去，气味等级肉眼可见地下来。顺带说一句，气味这东西挺主观，所以行业里现在都不靠鼻子拍板，而是按VDA 270这类标准方法测——把样品放密封瓶里恒温一定时间，由评价人员按等级打分，有数据才能跟车厂、家电厂对得上话。
除味不是拿香精盖味，是把臭味分子真拆了。
异味料当低价料卖，除味母粒一加能上一个价档
这一节算账。厂家为什么要买除味吸湿剂？损失场景很直接：一是气味等级过不了整车厂、家电厂的要求，来料检验被退；二是内饰件装出去，客户投诉一开车门有味，售后索赔；三是再生料因为味大只能当低价杂料卖，每吨少卖一两千，性能再好也变现不了。
除味母粒添加量常规1%-3%，高异味3%-5%，看着不多，可它直接决定这堆再生料能卖到哪一档。按行业通用成本口径，再生PP约六七千元一吨，除味母粒按工业通用十几二十几元一公斤、加2%，折每吨成本几百块，换来的是从杂料级升到内饰级的身价差。
省在哪：除味后再生料能进内饰、家电，一吨多卖的钱远超母粒成本。稳在哪：气味批次一致，客户复测不投诉。灵活在哪：异味重的料多加点，料还干净少加点，用量跟着料的状态调。算这笔账别光盯着母粒那几百块，要比的是同一吨再生料，加完母粒能从杂料价跳到内饰价，中间那个差价才是大头。
下面按行业通用口径演个示例：1吨再生PP内饰料，料约6500元/吨，加2%复合除味吸湿母粒（按20元/公斤量级），折每吨成本约400元。这四百块把气味等级从偏高拉到车厂可接受范围，料从杂料级进了内饰级，一吨多出的身价差远超四百。
| 成本项 | 不加除味母粒 | 加2%复合除味母粒 | 差异说明 |
|---|
| 母粒成本 | 0 | 约+400元/吨 | 按母粒约20元/公斤、2%计 |
| 气味等级 | 偏高、过不了车厂 | 明显下降、可过检 | VDA 270气味测试 |
| 能卖的档次 | 杂料低价 | 内饰/家电级 | 身价提升一档 |
| 水分问题 | 易银纹气泡 | 兼吸湿、表面干净 | 湿料更稳 |
| 综合 | 料便宜但卖得贱 | 小投入抬价档 | 算身价账才划算 |
注：为示例演算，再生料与母粒单价为2026年市场通用参考行情，随上游波动；实际以当期报价与气味等级实测核定。拿不准除味母粒加多少、配不配吸湿的？把再生料来源和气味要求发来，帮你对牌号、算这笔提价账。
再说买现成低气味改性再生粒料，还是拿再生料自己加除味母粒。买改性料省事，供应商把除味、相容、配色都做了；但按行业通用成本口径，一吨改性粒料在裸料之上叠加挤出加工费约1000-1500元、包装费100-250元、管销财费约5%-10%，再加利润，自改等于把这层加价省掉。
| 对比项 | 买低气味改性再生粒料 | 再生料+除味吸湿母粒自改 |
|---|
| 料本 | 叠加加工费、包装、管销财及利润 | 再生料加母粒裸价，通常更低(行业通用口径) |
| 灵活度 | 气味等级固定 | 按异味程度调母粒份数 |
| 起订量 | 整吨起订 | 再生料随便进，母粒按袋补 |
| 货期 | 受供应商排产 | 自己造粒随用随调 |
| 合规数据 | 供应商给气味报告 | 自控配方，自留气味检测数据 |
| 适合谁 | 用量小、没造粒线 | 有挤出线、再生料来源稳、量大 |
边界得讲清楚：除味母粒救不了脏得离谱的料，油污水渍重、PVC和PE混进去的杂料，先分选清洗再说；做食品接触、医疗级的，除味体系本身的迁移也要单独过正规检测，别图省事跳过这一关。别指望一加母粒就能把所有杂味全部清零，它是把可接受范围内的气味压下去，给料一个进内饰、进家电的台阶。
水分是帮凶，味和水一起治，再生料才真正干净。
除味吸湿不只PP用，PE、ABS、PA再生料都在治
一提除味就想到再生PP，其实哪类再生料都有味有水的问题。再生料里哪类最怕味怕水？下表逐类看。
| 品类 | 典型场景 | 添加量范围 | 效果 | 注意事项 |
|---|
| 再生PP | 汽车内饰、家电外壳 | 1%-4% | 降VOC、过气味测 | 浅色选白色母粒 |
| 再生PE | 包装桶、托盘 | 1%-3% | 去油酸味 | 注意析出 |
| 再生ABS | 家电外壳、玩具 | 1%-3% | 降气味、稳外观 | ABS热解味重 |
| 再生PA | 齿轮、结构件 | 1%-3% | 兼吸湿、防银纹 | 仍需预烘干 |
| 再生PET | 片材、打包带 | 1%-3% | 去味、降水分 | 配合扩链剂 |
| 再生PS | 日用品、包装 | 1%-3% | 降苯乙烯味 | 浅色母粒 |
| 汽车内饰PP | 门板、立柱 | 3%-5% | 过VDA气味 | 按车厂标准测 |
| 再生混合料 | 杂料改性 | 3%-5% | 压异味、提可用度 | 先分选再除味 |
这张表只给方向，具体份数要按气味等级打样。宁波市科隆新材料有限公司在再生PP、再生PE原料和除味母粒、吸湿母粒上常年有货，针对汽车内饰客户会按VDA气味标准推复合除味体系，针对高湿再生料会把除味和吸湿配在一起，打样阶段提供公斤级试样和气味对比数据。有再生料异味重、卖不上价拿不准的？把基材、来源、气味要求发来，先帮你看方向。
除味这步省了，再生料的身价就卡在低价那档。
一股塑料味被退货，加了除味母粒气味等级降下来
说个再生料厂被味退货的真事（情景示例，非特定客户）。浙江一家做再生PP汽车内饰件的厂，料便宜、性能也够，可交样到车厂，VDA 270气味测试没过，一股热塑料味，整批复测退回来。老板愁的是，换全新料成本翻上去，不换又过不了检。
宁波市科隆新材料有限公司给他们配了复合除味吸湿母粒，按3%在挤出线上加进去。再造粒注塑，再送检，气味等级从原来偏高的级别降到了车厂可接受范围，银纹气泡也少了。
变化在哪：一是料从被退货变成一次过检，重新进了内饰供应链；二是不用全换新料，再生PP加母粒的料本远低于全新料；三是同一套除味体系，给异味重的批次多倒点、干净批次少倒点，灵活。前提是他们有气味测试的渠道，没这个测不了味的高低。
这个边界也要说透：除味母粒不是万能。再生料分选不干净、油污重，加再多也压不住；车厂气味标准年年收紧，过了这次检不等于下次自动过，每次换批次都得复测。做食品接触的，除味母粒本身还得过正规迁移检测，别省这步。
味降下来了，再生料的身价才升上去。
气味等级数据说话，异味料也能卖上价
收尾给一张快速选型速查表，照着自己的再生料对号入座。
| 你的再生料 | 先测什么 | 推荐方向 | 什么时候别这么选 |
|---|
| 汽车内饰PP | VDA气味等级 | 复合除味3%-5% | 油污重先清洗 |
| 家电外壳料 | VOC+外观 | 除味母粒2%-3% | 浅色选白母粒 |
| 高湿PA/PET | 含水率 | 除味+吸湿母粒 | 仍需预烘干 |
| 油酸味再生PE | 异味来源 | 吸附型除味 | 杂质多先分选 |
| 杂混再生料 | 分选干净度 | 先分选再除味 | PVC混入先挑出 |
| 食品接触料 | 迁移检测 | 合规除味体系 | 无检测别乱用 |
再生料除味被问得最多的几点
问：塑料除味剂一般加多少合适？答：常规1%-3%，高异味料3%-5%。从2%做起，测气味等级往上加，别一上来就倒满，加多了母粒成本上去、还可能影响浅色制品外观。浅色件记得选白色基母粒。
问：除味剂和吸湿母粒是一回事吗？答：不是。除味剂主攻吸附分解VOC和臭味分子，吸湿母粒主攻吸残余水分、防银纹气泡。高湿高异味的再生料两个一起用效果好，但吸湿母粒替代不了预干燥，PA、PET该烘干还得烘干。
问：加了除味母粒还有味，先查什么？答：先查料本身脏不脏——油污、PVC杂质混进去，除味压不住；再查挤出时有没有充分脱挥，温度和真空给够；还不行就看除味母粒加够没有、分散均不均。都做了还味大，那就是料源问题，得换料源，别在助剂上死磕。
味和水一起治，再生料才卖得上价。
再生料要进内饰家电，先把味和水处理干净
宁波市科隆新材料有限公司长期经营再生PP、再生PE等回收原料及除味吸湿剂，除味母粒、分子筛、除醛体系有稳定货源。不管你是做汽车内饰要过VDA气味，还是做家电外壳要降VOC，或者处理高湿再生料，都可以把再生料来源和气味要求告诉我们，按异味程度推荐除味体系。
这一篇讲除味吸湿，同系列的扩链剂篇讲怎么把再生料分子量接回来，做再生工程件的厂家两篇搭着用。关注这个系列，塑料助剂的账一篇篇给你算明白。
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、添加量、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 truckload of recycled PP was brought to the workshop. As soon as the granulator started, a strong smell of plastic and oleic acid hit, and the operators immediately covered their noses. When molded into automotive interior parts, the customers smelled it and directly said the odor level exceeded the standard. The automaker's interior requirement is the VDA 270 odor test, and this smell would never pass. The good recycled material can only be sold as low-priced mixed material because of the odor.
There are two headaches with recycled materials: one is odor, the other is moisture. If the odor is too strong, customers won’t want it and it can’t be sold at a good price; if the moisture content is high, the products develop silver streaks and bubbles, and it also accelerates decomposition, producing odor. This article talks about how deodorizers and desiccants can tackle these two hidden killers at the same time, allowing smelly recycled materials to be sold at a good price.
First, present a quick reference table of deodorizers and moisture absorbers, clearly listing the mainstream varieties, key parameters, typical products, and dosage ranges.
| system | Representative varieties | Key Parameters / Features | Typical products | Add ratio |
|---|
| Adsorptive | Zeolite molecular sieve | Porous adsorption of VOCs and aldehydes | Recycled PP/PE interior | 1%-4% |
| Chemical deodorization | Formaldehyde/Deodorizing Masterbatch | Decompose aldehydes, sulfur, and amines | Car interiors, home appliances | 1%-3% |
| Hygroscopic | Active Silicate/Molecular Sieve Masterbatch | Absorb residual moisture and prevent silver streaks | PA/PET recycled material | 1%-3% |
| Composite | Adsorption Decomposition Hygroscopic | Deodorize and dry together | High-odor recycled material | 2%-5% |
| Activated carbon type | Carbon masterbatch | Strong aroma, light colors can use the light-colored version | Dark recycled products | 1%-4% |
Note: The above applies to the general industry range; the specific grade and deodorization effect are subject to the manufacturer's TDS and actual odor rating; moisture-absorbing masterbatch cannot replace pre-drying.
Recycled materials can't be sold at a good price; it's often not the performance that's lacking, but that persistent odor that can't be removed.
First, let's clarify the accounts: recycled material is cheap, which is supposed to be its advantage, but a single smell completely swallows up this advantage. Interior parts made from new material are odorless and pass odor tests, allowing them to be sold at interior-grade prices; the same batch of recycled material, with similar performance but having a smell, makes customers reduce the price after just smelling it, dropping from interior-grade to miscellaneous-grade, costing a few thousand per ton difference.
Where does this smell come from? During the recycling, processing, and storage of recycled materials, the resin undergoes thermal-oxidative degradation, producing aldehydes. Residual oils and additives decompose into sulfides and amines. On top of that, the moisture absorbed by the material—these small molecules are the sources of VOCs and odors. If you don’t remove them, no matter how cheap the material is, it can’t be used in interiors or home appliances, which are sensitive to odors.
Ningbo Cologne New Materials Co., Ltd. has long been engaged in the business of various recycled raw materials and additives, with a stable supply of recycled PP, recycled PE, as well as deodorizing masterbatch and moisture-absorbing masterbatch. For the category of deodorizing and moisture-absorbing agents, one method is physical adsorption—using zeolite molecular sieves and activated carbon to capture small VOC molecules; the other method is chemical decomposition—reacting odor molecules such as aldehydes, sulfides, and amines into odorless substances. Cologne New Materials recommends combinations based on the odor level of the recycled materials, sends samples in kilogram quantities, and provides comparison data of odor levels.
The odor of recycled materials is the most hidden cut on the quotation sheet.
Figure 1 Schematic of odor-removing masterbatch adsorbing and decomposing odor molecules
The job of a deodorizer is to capture odor molecules and break them down into odorless ones.
Explain the mechanism in plain language. Removing odors is not about spraying flavoring into the material to cover up the smell—that’s like fooling yourself; when the temperature rises, the fragrance disappears and the bad odor comes back. Proper odor-removing masterbatches do two things: first, they absorb like a sponge. Zeolite molecular sieves are full of micropores that capture the small VOC molecules escaping from the material; second, they break down like a cleaner. The active groups inside react with odor molecules like aldehydes, sulfur compounds, and amines, breaking them down into odorless substances.
Moisture is also an accomplice. When recycled material absorbs moisture, the water turns into steam during processing, causing silver streaks on the surface of the product and bubbles inside. Moisture also contributes to the decomposition of the resin, producing odors. Therefore, in deodorizing masterbatches, hygroscopic components are often added to remove residual moisture as well. But it must be made clear: hygroscopic masterbatches are only an aid and cannot replace proper pre-drying. Hydrophilic materials like PA and PET still need to be dried before use.
There is literature data for reference: adding about 4% of zeolite-based deodorizer to recycled materials can reduce the odor intensity by approximately 45% compared to not adding it. In low-odor recycled PP formulations used for automotive interiors, composite deodorizers often account for 3-8 parts. At this level, the odor grade visibly decreases. Incidentally, odor is quite subjective, so the industry nowadays does not rely on the nose alone to make decisions; instead, they measure according to standard methods like VDA 270—placing the sample in a sealed bottle at a constant temperature for a certain period, then having evaluators score it by grade, so that there is data to communicate with car manufacturers and home appliance manufacturers.
Deodorization is not about covering the smell with fragrance; it's about actually breaking down the odor molecules.
Odorous materials are sold as low-priced materials, and adding deodorizing masterbatch can raise them to a higher price level.
This section is about accounting. Why do manufacturers buy odor-removing and moisture-absorbing agents? The loss scenarios are very straightforward: first, the odor level fails to meet the requirements of automobile or appliance manufacturers, and the incoming material inspection gets rejected; second, interior parts are shipped out, and customers complain about the smell when they open the car door, leading to after-sales claims; third, recycled materials with a strong odor can only be sold as low-priced miscellaneous materials, resulting in a loss of a thousand or two per ton, no matter how good their performance is, they cannot be monetized.
The typical addition of odor-removing masterbatch is 1%-3%, and 3%-5% for strong odors. It may not seem like much, but it directly determines the grade this recycled material can be sold at. According to the industry's common cost standards, recycled PP is about six to seven thousand yuan per ton, and odor-removing masterbatch is generally priced at a dozen to twenty-something yuan per kilogram. Adding 2% translates to a few hundred yuan per ton in cost, but it upgrades the value from a miscellaneous grade to an interior-grade level.
Where the savings are: After deodorization, recycled material can be used in interior parts and home appliances, and the extra money per ton far exceeds the cost of the masterbatch. Where the stability is: The odor is consistent from batch to batch, and customers do not complain upon retesting. Where the flexibility is: For materials with a strong odor, add a bit more; for cleaner materials, add a bit less, adjusting the amount according to the state of the material. When calculating this, don’t just focus on the few hundred yuan for the masterbatch—you should compare the same ton of recycled material, which, after adding the masterbatch, can jump in price from scrap-level to interior-level. The difference in the middle is the real profit.
Here is an example according to the common industry standards: 1 ton of recycled PP interior material costs about 6,500 yuan/ton. Adding 2% composite deodorizing and moisture-absorbing masterbatch (around 20 yuan/kg) results in an additional cost of about 400 yuan per ton. This 400 yuan reduces the odor level from relatively high to an acceptable range for car manufacturers, upgrading the material from a mixed-grade to interior-grade. The added value per ton far exceeds the 400 yuan.
| Cost item | Without deodorizing masterbatch | Add 2% compound deodorizing masterbatch | Difference Explanation |
|---|
| Masterbatch cost | Zero | About 400 yuan/ton | Calculated at about 20 yuan/kg for the masterbatch, at 2% |
| Odor level | Slightly high, can't pass the factory inspection | Significantly decreased, can pass inspection | VDA 270 Odor Test |
| salable grade | Low-priced miscellaneous materials | Interior / Home Appliance Grade | Increase in value level |
| Moisture issue | Easy Silver Pattern Bubble | Both moisture-absorbing and surface-clean | Wet material is more stable |
| Comprehensive | Cheap materials but sold at a low price | Small Investment Price Increase Tier | It's only worth it when you calculate your own value. |
Note: For example calculation, the unit prices of recycled material and masterbatch are based on the general market reference in 2026 and fluctuate with upstream changes; the actual prices are based on current quotations and the verified odor grade. Unsure about how much deodorizing masterbatch to add or whether to include moisture-absorbing? Send over the source of the recycled material and the odor requirements, and I can help you with the grade selection and calculate this price increase.
Moreover, when it comes to buying ready-made low-odor modified recycled pellets, it is still an option to add deodorizing masterbatch to recycled material yourself. Buying modified material is more convenient, as the supplier has taken care of deodorization, compatibility, and color matching; but according to the industry's common cost calculation, on top of the base material, a ton of modified pellets includes extrusion processing fees of about 1,000–1,500 yuan, packaging fees of 100–250 yuan, and management, sales, and financial expenses of about 5%-10%, plus profit. DIY modification essentially saves this added cost layer.
| Comparison item | Buy low-odor modified recycled pellets | Recycled material deodorizing and moisture-absorbing masterbatch self-modified |
|---|
| material cost | Add processing fees, packaging, administrative and sales expenses, and profit | The base price of recycled material plus masterbatch is usually lower (industry standard wording) |
| Flexibility | Odor level fixed | Adjust the amount of masterbatch according to the degree of odor |
| Minimum order quantity | Minimum order: one ton | Recycled material can be added freely, masterbatch is replenished by the bag |
| Delivery time | Subject to supplier scheduling | Make granules yourself and adjust as needed |
| compliant data | The supplier provides an odor report | Self-controlled formula, retained scent detection data |
| Suitable for whom | Small dosage, no granulation line | There is extruded line, with a stable source of recycled material and large quantity |
The boundaries need to be made clear: odor-removing masterbatch cannot save materials that are outrageously dirty. If there are heavy oil stains, water marks, or mixed contaminants of PVC and PE, they need to be sorted and cleaned first. For food-contact or medical-grade products, the migration from the odor-removal system itself also needs to go through formal testing; don't skip this step for the sake of convenience. Don't expect that simply adding masterbatch can completely eliminate all odors; it only suppresses odors within an acceptable range, giving the material a step up to be used in interior or home appliance applications.
Moisture is an accomplice; flavor is treated together with water, and only recycled material is truly clean.
Deodorizing and moisture-absorbing is not only used for PP; recycled PE, ABS, and PA are also being treated
Whenever we talk about odor removal, we think of recycled PP. In fact, all types of recycled materials have issues with odor and moisture. Which type of recycled material is most sensitive to odor and moisture? The table below shows each type.
| Category | Typical scenario | Addition range | Effect | Precautions |
|---|
| Recycled PP | Car interiors, home appliance housings | 1%-4% | Reduce VOCs, test for odor | For light colors, choose white masterbatch |
| Recycled PE | Packaging barrels, pallets | 1%-3% | Remove greasy and sour taste | Pay attention to precipitation |
| Recycled ABS | Home appliance shells, toys | 1%-3% | Reduce odor, stabilize appearance | ABS pyrolysis has a strong odor |
| Recycled PA | Gears, structural parts | 1%-3% | Moisture-absorbing and anti-silver streak | Still needs pre-drying |
| Recycled PET | Sheets, strapping | 1%-3% | Deodorization, moisture reduction | Used with a chain extender |
| Recycled PS | Daily necessities, packaging | 1%-3% | Reduced styrene odor | Light-colored masterbatch |
| Car interior PP | Door panel, pillar | 3%-5% | Pass VDA odor | Measured according to the car manufacturer's standards |
| Recycled mixture | Modified with miscellaneous materials | 3%-5% | Suppress odor, improve usability | Sort first, then remove the odor |
This table only provides direction; the specific quantities need to be sampled according to the odor level. Ningbo Cologne New Materials Co., Ltd. has long-term stock of recycled PP, recycled PE raw materials, as well as odor-removing masterbatches and moisture-absorbing masterbatches. For automotive interior customers, they provide a composite odor-removal system based on VDA odor standards. For high-moisture recycled materials, they combine odor removal and moisture absorption. During the sampling stage, they provide kilogram-level samples and odor comparison data. Are you dealing with recycled materials that have strong odors, are hard to sell, or whose prices you are unsure about? Send your base materials, sources, and odor requirements, and they will first help you assess the direction.
If the deodorizing step is skipped, the value of recycled material will be stuck at the low-price range.
A plastic smell was returned, and after adding odor-removing masterbatch, the odor level dropped.
Let me tell a true story about a recycled material factory having their materials returned because of odor (scenario example, not a specific customer). A factory in Zhejiang producing recycled PP automotive interior parts had cheap materials with adequate performance. However, when samples were sent to the car manufacturer, they failed the VDA 270 odor test, emitting a strong thermoplastic smell, and the entire batch was returned after re-testing. The boss was worried because switching to all-new materials would increase costs, but not switching would fail the inspection.
Ningbo Cologne New Materials Co., Ltd. provided them with a composite odor-removing and moisture-absorbing masterbatch, which was added at 3% on the extrusion line. After re-granulation and injection molding, then sending it for inspection, the odor level dropped from the previously high level to a range acceptable to the car manufacturer, and silver streak bubbles also decreased.
Where the changes are: First, the material went from being returned to passing inspection in one go, re-entering the interior supply chain; second, there's no need to completely replace with new material, as the material made from recycled PP plus masterbatch is far cheaper than all-new material; third, using the same odor-removal system, they can pour more for batches with strong odors and less for clean batches, making it flexible. The prerequisite is that they have a channel for odor testing; without it, they cannot measure the intensity of the odor.
This boundary also needs to be clarified: odor-removing masterbatch is not万能 (universal). If recycled material is not properly sorted or heavily contaminated with oil, adding more will not suppress the odor; car manufacturers tighten odor standards every year, so passing this test does not mean you will automatically pass the next one, and every time the batch changes, it must be retested. For food-contact applications, the odor-removing masterbatch itself must also pass formal migration testing, so don't skip this step.
The taste goes down, only then does the value of recycled material go up.
The odor level data speaks for itself; even materials with an unpleasant smell can sell at a good price.
To wrap up, provide a quick selection reference chart, and match it to your own recycled material.
| Your recycled material | What should we test first? | Recommended direction | When will you stop choosing like this? |
|---|
| Automotive interior PP | VDA Odor Level | Compound Deodorization 3%-5% | Clean heavy oil stains first |
| Household appliance casing material | VOC Appearance | Deodorizing masterbatch 2%-3% | Choose white masterbatch for light colors |
| High Humidity PA/PET | Moisture content | Deodorizing and Moisture-Absorbing Masterbatch | Still needs pre-drying |
| Oleic Acid Flavored Recycled PE | Source of odor | Adsorption-type deodorization | Sort first if there are many impurities |
| Mixed recycled material | Sorting cleanliness | Sort first, then remove the odor | Remove PVC before mixing |
| Food contact material | Migration Detection | Compliance Deodorization System | Do not use indiscriminately without testing |
The most frequently asked questions about odor removal from recycled materials
Q: How much plastic deodorizer is generally appropriate? A: Normally 1%-3%, for materials with strong odors 3%-5%. Start with 2%, test the odor level and increase gradually; don’t pour it all at once. Adding too much will increase the masterbatch cost and may affect the appearance of light-colored products. For light-colored parts, remember to choose a white-based masterbatch.
Q: Are deodorants and moisture-absorbing masterbatches the same thing? A: No. Deodorants mainly focus on adsorbing and breaking down VOC and odor molecules, while moisture-absorbing masterbatches mainly focus on absorbing residual moisture and preventing silver streaks and bubbles. For regenerated materials with high moisture and strong odors, using both together works well, but moisture-absorbing masterbatches cannot replace pre-drying; PA and PET still need to be dried if required.
Q: Even after adding the deodorizing masterbatch, there’s still an odor. What should be checked first? A: First, check if the material itself is dirty—oil stains or PVC impurities mixing in cannot be covered by deodorizing; then check whether the extrusion process allows for sufficient volatilization, with adequate temperature and vacuum; if that doesn’t work, see if enough deodorizing masterbatch has been added and if it is evenly dispersed. If all this is done and there’s still a strong odor, then it’s a raw material issue, and you need to change the raw material instead of stubbornly focusing on additives.
Flavor is treated together with water, and only recycled material can sell at a good price.
Recycled materials should be used in interior home appliances, but first handle the odor and moisture properly.
Ningbo Kolon New Materials Co., Ltd. has long been engaged in trading recycled materials such as recycled PP and recycled PE, as well as deodorizing and moisture-absorbing agents, deodorizing masterbatches, molecular sieves, and formaldehyde-removal systems, all with stable supply sources. Whether you are making automotive interiors that need to pass VDA odor standards, producing home appliance housings to reduce VOCs, or dealing with high-moisture recycled materials, you can tell us the source of the recycled materials and your odor requirements, and we will recommend a deodorizing system based on the level of odor.
This article talks about deodorizing and moisture absorption. Another article in the same series on chain extenders discusses how to restore the molecular weight of recycled materials. Manufacturers making recycled engineering parts can use both articles together. Follow this series, and we'll clearly explain the accounts for plastic additives article by article.
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 grade, parameters, prices, dosage, certifications, and application cases mentioned herein are for reference only. Specific information should be based on the latest official data and batch inspection reports from the manufacturers. This article does not constitute any purchasing or investment advice, and readers bear the risk of any actions taken based on it.
