一批PVC食品级软管发到商超，消费者投诉“有异味、手上沾油”，拆开一看内壁有油状析出。商超要求全部下架，厂家损失惨重。配方师知道，用的还是传统DEHP邻苯类增塑剂，迁移性大，而且食品接触合规早就过不了——等于用旧配方闯新合规。
把时间倒回一百年：没有增塑剂的PVC硬得像块石板，是增塑剂把它从硬疙瘩变成了柔软的软管。
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。
增塑剂速查总表：邻苯、非邻苯、生物基三张牌
增塑剂是所有助剂里加得最多的——按每百份树脂算，常加20到60份。选哪张牌，取决于你做多软的制品、卖到哪、过哪国合规。下面这张表一页列清。
| 体系 | 代表品种 | 关键参数 | 典型制品 | 添加比例(phr) |
|---|
| 邻苯类通用 | DOP、DEHP | 便宜通用，部分品种受限 | 普通软PVC、人造革 | 20-50 |
| 邻苯高分子量 | DINP、DIDP | 耐迁移、耐久 | 电线电缆、耐久制品 | 30-60 |
| 非邻苯 | DOTP对苯二辛酯 | 耐热耐迁移、合规 | 电线电缆、汽车软件 | 30-60 |
| 耐寒特殊 | 己二酸酯DOA | 低温柔韧 | 耐寒软管、薄膜 | 10-30(复配) |
| 生物基 | 环氧大豆油、柠檬酸酯 | 环保、食品级 | 食品接触、玩具 | 10-40 |
注：phr为每百份树脂的份数；以上为行业通用范围，具体牌号与物性参数以各生产企业官方TDS为准。先定目标硬度和合规要求，再选体系。
图1 增塑剂——柔软柔韧的PVC软管与薄膜
增塑剂是PVC的软化剂，邻苯与非邻苯之争正当时
这位主角，让硬PVC变软的魔术师。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，在增塑剂、热稳定剂等PVC助剂上有稳定供货渠道。增塑剂这个品类，本质上就是PVC的“软化剂”——PVC天生又硬又脆，全靠它把材料变得柔软可塑。
增塑剂就像给PVC分子链之间抹了润滑油，链段滑得动，塑料自然就软。
从机理讲，增塑剂小分子插入PVC分子链之间，削弱链间作用力、把玻璃化转变温度往下拉，链段更容易运动，材料就变软变韧。它是所有助剂里添加量最大的一类，软PVC里动辄二三十份到五六十份，直接决定制品的软硬手感。
增塑剂往PVC里塞得越勤快，分子链之间的缝隙就越大——硬疙瘩就是这么被哄成软面条的。
今天这个品类的核心矛盾在合规：邻苯二甲酸酯（DOP、DEHP等）便宜好用，但DEHP等在玩具、食品接触、医疗领域被法规限制；非邻苯体系如DOTP、DINCH、柠檬酸酯更合规；生物基如环氧大豆油、柠檬酸酯环保可再生，是新方向。
把柔性的增塑剂小分子塞进僵硬的PVC链之间，像给一列火车每节车厢都留了缝隙。
邻苯类便宜好用，但DEHP在玩具和食品接触上被叫停——别拿旧配方闯新合规。
逐品种速查：DOP走量，DOTP合规，环氧大豆油走环保
品种看着多，抓住几条主线就能盖大部分软PVC应用。
做哪种软制品、卖给谁、过哪国合规——这三件事没想清楚，选增塑剂就是在赌运气。
DOP（邻苯二甲酸二辛酯/DEHP）：邻苯类的传统主力，便宜、综合性能均衡，普通软PVC、人造革里用得多。选它的信号：做一般工业软制品、不接触食品玩具、成本敏感。注意：DEHP在多个市场和用途上受限，出口和接触类制品别再用。
供货提示：DOTP、环氧大豆油等非邻苯增塑剂科隆新材可稳定供货，每批附迁移性和闪点数据，公斤级试样支持先做相容性测试。
DINP、DIDP：高分子量邻苯类，耐迁移、耐久好，电线电缆和长寿命制品常用。注意：虽比DEHP温和，部分市场对邻苯总量仍有限制，出口要核对法规。
DOTP（对苯二甲酸二辛酯）：非邻苯主力，耐热、耐迁移、体积电阻率高，电线电缆、汽车软件的合规替代。选它的信号：要替代DOP、过环保合规、做耐热耐久件。
环氧大豆油（ESO）：辅助增塑剂兼辅助热稳定剂，生物基、环保、成本比柠檬酸酯低，是PVC软制品里的常见配角。选它的信号：做食品接触软制品、需要热稳定协同、想在合规基础上压一压成本。注意事项：单独使用增塑效率低，不能当主增塑剂扛起柔软度大旗，通常和DOTP、DOP等主增塑剂复配使用，添加量3-10phr；环氧值要控制稳定，太高容易析出，太低热稳定协同效果出不来。
柠檬酸酯：高端生物基增塑剂，食品接触和玩具级合规友好，用于牙胶、儿童软胶、医疗级软PVC。选它的信号：出口欧盟玩具、母婴接触件、主打环保标签。注意：价格比ESO高一截，一般工业软制品不必硬上。
软管、电线包皮、人造革、一次性手套——你摸过的软PVC，背后都是增塑剂在干活。
增塑剂的烦恼：它是所有助剂里加得最多的，也是最容易被人嫌弃会迁移的那个。
替代对照：DEHP等受限品怎么换？先看这张表
法规在收紧，很多老配方的DOP/DEHP要找替代。下面列常见方向和切换前提。
| 原用方向 | 典型应用 | 可对标方案 | 切换前提 |
|---|
| DOP/DEHP | 普通软PVC | DOTP/DINP | 对比硬度、耐迁移、低温、成本 |
| DEHP(受限用途) | 玩具/医疗件 | DINCH/柠檬酸酯 | 过玩具/医疗合规、迁移测试 |
| 进口DOTP | 电线电缆 | 国产DOTP | 对比耐热、体积电阻率、耐迁移 |
| 进口环氧大豆油 | 环保食品级 | 国产ESO | 对比环氧值、析出、食品合规 |
表中所列只是方向参考，实际迁移和硬度手感仍要打样复测。
增塑剂替代要做迁移和析出对比，科隆新材寄送公斤级DOTP/环氧大豆油试样时附闪点和迁移性参考数据，客户可以先做相容性和食品接触合规验证再切换。
要合规软制品就上DOTP或环氧大豆油，别再纠结DEHP那点差价。
行业场景速查：电线料和玩具料要的是两种配方
同样是软PVC，做电线电缆和做玩具牙胶，增塑剂选择完全不同。下面按行业拆。
| 行业 | 典型制品 | 客户最先问的参数 | 推荐体系 | 认证要求 |
|---|
| 电线电缆 | 软线包皮 | 耐热、体积电阻率 | DOTP/DINP | RoHS、电缆标准 |
| 玩具母婴 | 软胶玩具、牙胶 | 合规、迁移 | 柠檬酸酯/DINCH | EN71、GB 6675 |
| 建材 | 密封条、地板革 | 耐久、耐候 | DINP/DOTP | GB/T、REACH |
| 包装 | 食品软管、薄膜 | 食品接触 | 环氧大豆油/柠檬酸酯 | GB 4806、FDA |
| 日用品 | 手套、人造革 | 成本、手感 | DOP/DINP通用 | RoHS |
举个场景：做出口软胶玩具，DEHP等六种邻苯必须不检出。这时直接放弃邻苯，选柠檬酸酯或DINCH，先过EN71迁移测试再谈手感。
增塑剂析出渗油，先查添加量超没超、相容性够不够，别只骂配方。
添加量与搭配要点：软硬全靠配比
增塑剂的添加量直接决定制品软硬，是配方里最显性的变量。下面四条是通用线。
增塑：链松了，料就软。
◆ 通用软PVC：DOTP或DOP 30-50phr，按目标邵氏硬度定份数。
◆ 电线电缆：DOTP/DINP 40-60phr，耐热耐迁移，配钙锌热稳定。
◆ 耐寒制品：己二酸酯DOA 10-30phr复配，提升低温柔韧。
◆ 食品/玩具：环氧大豆油或柠檬酸酯，合规优先，注意与稳定剂协同。
搭配要点：增塑剂要和PVC热稳定剂（如钙锌）并用，否则加工时PVC易分解变色；添加过量会析出渗油、表面发黏；生物基增塑剂可与邻苯少量复配兼顾环保和成本。
主辅增塑剂复配有个基本原则：主增塑剂（DOTP、DOP、DINP这类）负责把硬度拉到目标值，占总增塑剂用量的七成以上；辅助增塑剂（环氧大豆油、氯化石蜡、己二酸酯这类）负责补短板——ESO补热稳定、DOA补低温柔韧、氯化石蜡降成本。复配比例不是拍脑袋：主辅比例失衡会两头不讨好，辅剂加太多主增塑剂扛不住柔软度，主剂太集中又会把成本和迁移性顶上去。行业做法是先按硬度定主剂份数，再用3-10phr辅剂补特定性能，最后做析出和低温柔韧复测锁配方。
复配最常见的坑有两个：一是辅剂加得太多，主增塑剂被稀释，制品看着软但一拉伸就粘模、析出，冬天还变脆；二是主剂和辅剂选错搭子，比如用DEHP类主剂配ESO做食品接触件，ESO合规了但主剂早就过不了关，等于白搭。正确顺序是先按用途定主剂合规清单（食品玩具直接排除DEHP），再在合规主剂里挑性价比，最后才用辅剂补短板。别反过来为了加一点ESO的环保故事，把主剂留在受限名单里。
做哪种软制品、卖给谁、过哪国合规——想清楚这三件事，邻苯还是非邻苯，自然就有了答案。
加工与合规红线：迁移析出和法规是硬线
增塑剂出问题，多半栽在析出和法规上。下面这张表把关键环节列出来。
| 环节 | 参考值 | 做错的后果 |
|---|
| 添加量 | 按目标硬度20-60phr | 过量→析出渗油、表面发黏 |
| 相容性 | 增塑剂与PVC相容性评估 | 不相容→迁移、喷霜、发黏 |
| 法规用途 | DEHP等受限品按用途禁用 | 不合规→玩具/食品被退运 |
| 配热稳定剂 | 增塑+钙锌等热稳定并用 | 不配→加工分解、变色 |
合规红线：邻苯类增塑剂受REACH附录17等法规限制，玩具、食品接触、医疗用途要选非邻苯或生物基；出口欧盟核对REACH，食品级过GB 4806/FDA。迁移检测和合规声明随货归档。
FAQ：采购和配方工程师最常问的五个问题
Q1：国产增塑剂能不能替代进口料？
可以，DOTP、环氧大豆油、DOP等大宗品种国产和进口差距已经很小，批次稳定的国产品牌完全够用。但在高端医疗级、出口欧盟严格邻苯限制、极低析出要求场景，进口在纯度和批次一致性上仍有优势。替代要先拿公斤级样品测硬度、耐迁移、低温性能和合规项，通过后小批量验证再放量。需要对照样品的，可以按公斤级索取，附迁移和闪点数据一并比对。
Q2：为什么软PVC表面出油、发黏？
多半是增塑剂添加过量或与PVC相容性不够，小分子慢慢迁移到表面。解决办法是把份数降到目标硬度所需范围、换相容性更好的品种，或复配高分子量增塑剂减少迁移。
Q3：DOTP和DOP差别在哪？
DOP是邻苯类，便宜综合好但受限；DOTP是非邻苯，耐热、耐迁移、体积电阻率更高，电线电缆和合规制品更合适。手感上DOTP略偏硬一点，配方时要适当调整份数。
Q4：生物基增塑剂贵在哪？
生物基如环氧大豆油、柠檬酸酯环保、可再生、食品友好，价格和供应受农产品行情影响，部分品种比传统邻苯高。它的价值在合规和环保标签，成本敏感的一般工业软制品不必硬上。
Q5：增塑剂加得越多越软吗？
大体如此，份数越多越软、强度越低，但超过相容极限后会析出渗油，反而表面发黏、性能下降。要的不是越多越软，而是按目标邵氏硬度找合适份数。
选型三步清单：照着选软得合规
◆ 第1步·定硬度与用途：先定目标邵氏硬度、是否耐寒、是否食品/玩具/医疗接触，这决定份数和合规门槛。
◆ 第2步·选体系：一般工业走DOTP/DINP；食品玩具走柠檬酸酯/DINCH；耐寒复配己二酸酯；环保主打生物基。
◆ 第3步·核法规与迁移：核对REACH邻苯限制和食品接触标准，做析出迁移测试，配热稳定剂，先小试调硬度再批量。
软得合规，比软得便宜重要
增塑剂的选型要同时考虑柔软度、迁移性、耐低温和合规要求。邻苯类（DEHP/DBP）在玩具和食品接触领域已被限制，DOTP、DINCH、柠檬酸酯、环氧大豆油是主流替代方向。科隆新材可提供不同增塑剂的迁移性、闪点、低温脆化温度参考数据和食品接触合规文件，公斤级试样支持先做析出和柔软度对比。
去年，一家做PVC软管的厂被商超下架——消费者投诉有异味和渗油。科隆新材给他们推荐了DOTP替代DEHP，并搭配少量环氧大豆油提升稳定性，寄了公斤级样品。客户试产后，异味明显减轻，迁移析出量降到合规线以下，重新通过了食品接触检测，商超恢复上架。厂长说，原来以为换增塑剂会大幅增加成本，算下来每吨只多了约两百元，但避免了下架损失。
你的增塑剂，是邻苯类还是非邻苯类？
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 PVC food-grade hoses was sent to supermarkets, and consumers complained about a "strange odor and oily residue on their hands." Upon inspection, the inner wall was found to have oily deposits. The supermarket demanded a complete recall, causing huge losses for the manufacturer. The formulator knew that they were still using the traditional DEHP phthalate plasticizer, which has high migration, and would no longer pass food contact compliance—essentially using an old formula to try to meet new regulations.
Turn back time a hundred years: PVC without plasticizers is as hard as a slab of stone; it is the plasticizers that turn it from a hard lump into a flexible hose.
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.
Plasticizer Quick Reference Table: Phthalates, Non-Phthalates, Bio-based Three Categories
Plasticizers are added the most among all additives—calculated per hundred parts of resin, usually 20 to 60 parts are added. Which brand to choose depends on how soft a product you want to make, where you are selling it, and which country's regulations you need to comply with. The table below lists everything clearly on one page.
| system | Representative varieties | Key parameters | Typical products | Addition ratio (phr) |
|---|
| Phthalate general use | DOP, DEHP | Cheap and versatile, some varieties are restricted | Ordinary soft PVC, artificial leather | 20-50 |
| high molecular weight ortho-phenylene | DINP, DIDP | Migration-resistant, durable | Electric wires and cables, durable products | 30-60 |
| Non-phthalate | DOTP Di(2-ethylhexyl) terephthalate | Heat-resistant, migration-resistant, compliant | Electric wires and cables, automotive software | 30-60 |
| Cold-tolerant special | Dioctyl Adipate (DOA) | Low temperature flexibility | Frost-resistant hoses, films | 10-30 (compound preparation) |
| Bio-based | Epoxidized soybean oil, citrate esters | Environmentally friendly, food-grade | Food contact, toys | 10-40 |
Note: phr refers to parts per hundred parts of resin; the above is the general industry range, and specific grades and physical property parameters should be based on the official TDS of each manufacturer. First, determine the target hardness and compliance requirements, then select the system.
Figure 1 Plasticizers—Soft and flexible PVC hoses and films
Plasticizers are softeners for PVC, and the debate between ortho-phthalates and non-ortho-phthalates is timely.
This protagonist is the magician who makes rigid PVC soft. Ningbo Cologne New Materials Co., Ltd. has long been engaged in various plastic additives and modified materials, covering multiple domestic and international brand sources. It has stable supply channels for PVC additives such as plasticizers and heat stabilizers. The category of plasticizers is essentially the 'softener' of PVC—PVC is naturally hard and brittle, and it is entirely reliant on them to make the material soft and pliable.
Plasticizers are like applying lubricant between the PVC molecular chains; the chains can slide, and the plastic naturally becomes soft.
From a mechanistic point of view, plasticizer molecules insert themselves between PVC molecular chains, weakening the intermolecular forces and lowering the glass transition temperature, making the chain segments move more easily, so the material becomes softer and more flexible. It is the type of additive used in the largest amounts of all additives—in soft PVC, it is often added in twenty to thirty parts or even fifty to sixty parts, directly determining the softness and hardness of the final product.
The more frequently plasticizers are stuffed into PVC, the larger the gaps between the molecular chains become—this is how hard lumps are coaxed into becoming soft noodles.
The core issue in this category today is compliance: phthalates (like DOP, DEHP, etc.) are cheap and easy to use, but DEHP and others are regulated in toys, food contact, and medical fields; non-phthalate systems such as DOTP, DINCH, and citrate esters are more compliant; bio-based options like epoxidized soybean oil and citrate esters are environmentally friendly and renewable, representing a new direction.
Stuff the small molecules of flexible plasticizer between the rigid PVC chains, like leaving a gap between each carriage of a train.
Phthalates are cheap and easy to use, but DEHP has been banned in toys and food contact — don't use old formulas to bypass new compliance.
Quick check by type: DOP sales volume, DOTP compliance, epoxidized soybean oil is environmentally friendly
Although there are many varieties, grasping a few main lines can cover most soft PVC applications.
Which type of soft product to make, who to sell it to, and which country's regulations to follow—if you haven't figured out these three things clearly, choosing a plasticizer is just gambling on luck.
DOP (Dioctyl Phthalate/DEHP): The traditional mainstay of phthalates, cheap and well-balanced in overall performance, widely used in ordinary flexible PVC and artificial leather. Signals for choosing it: for general industrial soft products, not in contact with food or toys, cost-sensitive. Note: DEHP is restricted in multiple markets and applications, and should no longer be used for export and contact products.
Supply Notice: Non-phthalate plasticizers such as DOTP and epoxidized soybean oil can be supplied stably by Cologne New Materials, with migration and flash point data provided for each batch. Kilogram-scale samples are available for preliminary compatibility testing.
DINP, DIDP: High molecular weight phthalates, resistant to migration, durable, commonly used in wires, cables, and long-life products. Note: Although milder than DEHP, some markets still have limits on the total phthalate content, and regulations should be checked for exports.
DOTP (Dioctyl Terephthalate): A non-ortho phthalate main product, heat-resistant, migration-resistant, high volume resistivity, a compliant alternative for wires, cables, and automotive software. Signals for choosing it: replacing DOP, meeting environmental compliance, making heat-resistant and durable parts.
Epoxidized Soybean Oil (ESO): Acts as an auxiliary plasticizer and auxiliary heat stabilizer. It is bio-based, environmentally friendly, and cheaper than citrate esters, making it a common supporting ingredient in PVC soft products. Signals for choosing it: making food contact soft products, needing heat stabilization synergy, and wanting to reduce costs within compliance. Precautions: Its plasticizing efficiency is low when used alone and it cannot serve as the main plasticizer to achieve softness; it is usually used in combination with primary plasticizers like DOTP, DOP, etc., at 3-10 phr. The epoxy value should be kept stable; too high may precipitate, too low will not provide heat stabilization synergy.
Citrate esters: high-end bio-based plasticizers, compliant and friendly for food contact and toy-grade applications, used in teething toys, children's soft rubber, and medical grade soft PVC. Signals for choosing it: exported to EU toys, maternal and infant contact items, highlighting eco-friendly labels. Note: the price is significantly higher than ESO, generally not necessary for standard industrial soft products.
Hoses, wire insulation, artificial leather, disposable gloves — the soft PVC you've touched all have plasticizers at work behind the scenes.
The trouble with plasticizers: they are the additives used in the largest amounts, and they are also the ones most likely to be disliked because they can migrate.
Alternative Comparison: How to replace restricted substances like DEHP? First, look at this table
Regulations are tightening, and many old formulas containing DOP/DEHP need alternatives. Below are common directions and prerequisites for switching.
| Original direction | Typical applications | Benchmark solution | Switch premise |
|---|
| DOP/DEHP | Ordinary soft PVC | DOTP/DINP | Compare hardness, migration resistance, low temperature, cost |
| DEHP (restricted use) | Toys/Medical Parts | DINCH/Citrate Ester | Toy/medical compliance, migration testing |
| Imported DOTP | Electric wires and cables | Domestic DOTP | Comparison of heat resistance, volume resistivity, and migration resistance |
| Imported epoxy soybean oil | Environmentally friendly and food-grade | Domestic ESO | Comparison of epoxy value, precipitation, and food compliance |
The directions listed in the table are for reference only; the actual migration and hardness feel still need to be tested with samples.
When replacing plasticizers, migration and exudation comparisons need to be made. When Cologne New Materials sends kilogram-level DOTP/epoxidized soybean oil samples, reference data for flash point and migration are provided. Customers can first conduct compatibility and food contact compliance verification before switching.
For compliant soft products, go with DOTP or epoxidized soybean oil, and stop worrying about the small price difference of DEHP.
Quick Reference for Industry Scenarios: Wire materials and toy materials require two different formulas
Even though both are soft PVC, the choice of plasticizer is completely different for making electrical wires and cables versus making teething toys. Below, it is broken down by industry.
| Industry | Typical products | The parameters the customer asked about first | Recommendation system | Certification requirements |
|---|
| Electric wires and cables | soft foreskin | Heat resistance, volume resistivity | DOTP/DINP | RoHS, cable standards |
| Toys and Maternal & Infant Products | Soft rubber toys, teething toys | Compliance, Migration | Citrate/DINCH | EN71, GB 6675 |
| Building materials | Sealing strip, linoleum | Durability, weather resistance | DINP/DOTP | GB/T, REACH |
| Packaging | Food hoses, films | Food contact | Epoxidized Soybean Oil/Citrate Ester | GB 4806, FDA |
| Daily necessities | Gloves, synthetic leather | Cost, feel | DOP/DINP General Purpose | RoHS |
Here's a scenario: When producing soft rubber toys for export, DEHP and five other phthalates must not be detected. At this point, simply give up on phthalates and choose citrate esters or DINCH, pass the EN71 migration test first, and then discuss the feel.
If the plasticizer exudes and seeps oil, first check whether the added amount exceeds the limit and whether the compatibility is sufficient; don't just blame the formulation.
Dosage and pairing key points: the softness and hardness entirely depend on the proportion
The amount of plasticizer added directly determines the softness or hardness of the product and is the most prominent variable in the formula. The following four points are general guidelines.
Plasticization: When the chains loosen, the material becomes soft.
◆ General-purpose soft PVC: DOTP or DOP 30-50 phr, the amount is determined according to the target Shore hardness.
◆ Electric wires and cables: DOTP/DINP 40-60 phr, heat-resistant and migration-resistant, formulated with calcium-zinc heat stabilizer.
◆ Cold-resistant products: DOA dioctyl adipate mixed at 10-30 phr to improve low-temperature flexibility and toughness.
◆ Food/Toys: Epoxidized soybean oil or citric acid esters, compliance preferred, pay attention to synergy with stabilizers.
Key points for formulation: Plasticizers should be used together with PVC heat stabilizers (such as calcium-zinc), otherwise PVC is prone to decomposition and discoloration during processing; excessive addition can cause oil exudation and surface stickiness; bio-based plasticizers can be partially blended with phthalates to balance environmental protection and cost.
There is a basic principle for blending primary and auxiliary plasticizers: the primary plasticizer (such as DOTP, DOP, DINP) is responsible for bringing the hardness to the target value, accounting for more than 70% of the total plasticizer amount; the auxiliary plasticizer (such as epoxidized soybean oil, chlorinated paraffin, adipate esters) is responsible for making up shortcomings—ESO improves thermal stability, DOA improves low-temperature flexibility, and chlorinated paraffin reduces cost. The blending ratio is not decided arbitrarily: an imbalance between primary and auxiliary plasticizers will be unsatisfactory, too much auxiliary plasticizer means the primary plasticizer cannot maintain softness, while too much primary plasticizer raises cost and migration. The industry practice is to first determine the amount of primary plasticizer based on hardness, then add 3-10 phr of auxiliary plasticizer to target specific properties, and finally conduct re-testing for exudation and low-temperature flexibility to lock the formula.
There are two most common pitfalls in compounding: first, adding too many additives, which dilutes the main plasticizer, making the product appear soft but sticky or exuding when stretched, and becoming brittle in winter; second, choosing the wrong combination of main agent and additives, such as using DEHP-type main agents with ESO for food contact parts—ESO may be compliant, but the main agent already fails compliance, making it pointless. The correct sequence is to first determine the compliant list of main agents based on the intended use (for food or toys, directly exclude DEHP), then select the cost-effective options from the compliant main agents, and finally use additives to fill the gaps. Do not reverse the order by leaving the main agent on the restricted list just to add a little environmentally-friendly story with ESO.
What kind of soft product to make, who to sell it to, and which country's regulations to follow—once you think through these three things, whether it contains phthalates or not naturally has an answer.
Processing and compliance red lines: migration, precipitation, and regulations are hard lines
When there are problems with plasticizers, it's mostly due to migration and regulations. The table below lists the key links.
| link; segment; part | Reference value | The consequences of doing wrong |
|---|
| Addition amount | According to the target hardness of 20-60 phr | Excess → oozing oil, sticky surface |
| Compatibility | Evaluation of Compatibility Between Plasticizers and PVC | Incompatible → Migration, Spraying, Sticky |
| Regulatory use | Restricted substances such as DEHP are prohibited based on their use | Non-compliant → Toys/Food are returned |
| With heat stabilizer | Plasticizers and simultaneous use of calcium and zinc for heat stabilization | Not suitable → processing and decomposition, discoloration |
Compliance red line: Phthalate plasticizers are restricted by REACH Annex XVII and other regulations. For toys, food contact, and medical uses, choose non-phthalate or bio-based options; for exporting to the EU, check REACH, and for food-grade applications, comply with GB 4806/FDA. Migration testing and compliance declarations should be archived with the shipment.
FAQ: The Five Most Common Questions Asked by Purchasing and Formulation Engineers
Q1: Can domestic plasticizers replace imported materials?
Sure, for bulk varieties like DOTP, epoxy soybean oil, and DOP, the gap between domestic and imported products is already very small, and domestically produced brands with stable batches are completely sufficient. However, for high-end medical grade applications, exports to the EU where strict phthalate restrictions apply, and scenarios requiring extremely low leaching, imported products still have advantages in purity and batch consistency. To replace them, kilogram-level samples should first be tested for hardness, migration resistance, low-temperature performance, and compliance items. After passing, small-batch verification can be done before scaling up. For comparison samples, kilogram-level samples can be requested, along with migration and flash point data for side-by-side comparison.
Q2: Why does the surface of soft PVC become oily and sticky?
It is mostly due to excessive addition of plasticizers or insufficient compatibility with PVC, causing small molecules to gradually migrate to the surface. The solution is to reduce the amount to the range required for the target hardness, switch to a variety with better compatibility, or blend with high molecular weight plasticizers to reduce migration.
Q3: What is the difference between DOTP and DOP?
DOP is phthalene, which is cheap and comprehensive, but has limitations; DOTP is non-phthalene, heat-resistant, migration-resistant, and has higher volumetric resistivity, making it more suitable for wires, cables, and compliant products. DOTP feels slightly harder, so the number of parts should be adjusted appropriately when formulating.
Q4: What makes bio-based plasticizers expensive?
Bio-based plasticizers such as epoxy soybean oil and citrate esters are environmentally friendly, renewable, and food-friendly. Their price and supply are affected by agricultural product trends, with some varieties higher than traditional phthals. Its value lies in compliance and environmental labeling, so cost-sensitive general industrial soft products do not need to be forced.
Q5: Does the more plasticizer you add, the softer it gets?
Generally, the more parts, the softer and lower the strength, but once the compatibility limit is exceeded, oil will precipitate, making the surface stickier and reducing performance. The goal is not to get softer as many as possible, but to find the appropriate quantity based on the target Shore hardness.
Three-step selection checklist: choose the softer to comply
◆ Step 1 · Determine hardness and use: first determine the target Shore hardness, cold resistance, and whether it comes into contact with food/toys/medical products. This determines the quantity and compliance threshold.
◆ Step 2 · Select system: general industrial use DOTP/DINP; food toys use citrate/DINCH; cold-resistant compound adinate; environmentally friendly focus on bio-based products.
◆ Step 3 · Nuclear Regulations and Migration: Check REACH phthalm limits and food contact standards, conduct precipitation migration tests, prepare heat stabilizers, first trial hardness before mass production.
Compliant with soft additives is more important than soft but cheaper .
Plasticizer selection must simultaneously consider softness, migration, low temperature resistance, and compliance requirements. Orthophthalmic compounds (DEHP/DBP) have been restricted in the toy and food contact sectors; DOTP, DINCH, citrate, and epoxy soybean oil are mainstream alternatives. Cologne New Materials can provide migration, flash point, low-temperature brittle temperature reference data and food contact compliance documents for different plasticizers; kilogram-scale samples support precipitation and softness comparisons first.
Last year, a factory producing PVC hoses was removed from supermarkets — consumers complained about odors and oil leakage. Kelong New Materials recommended DOTP as a substitute for DEHP, combined with a small amount of epoxy soybean oil to improve stability, and sent kilogram-level samples. After trial production, the customer's odor was significantly reduced, migration precipitation levels dropped below compliance lines, food contact testing was passed again, and the supermarket resumed shelves. The factory manager said they originally thought switching plasticizers would greatly increase costs, but calculated it only cost about 200 yuan per ton, but this avoided the loss of removal from shelves.
Is your plasticizer phthalite or non-phthalic?
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 responsible for any actions based on it
