料放俩月就发黄，客户说不是新料。变色从配方就输了，后期救不回来。
放俩月就黄，不是旧料是抗氧没配
TPE 变黄变色，配方决定颜色命运：基材、助剂、老化。结论先给：黄了再救来不及，抗黄得从配方配起——配方，是变黄的根子。
TPE变黄最大的坑：变色从配方就输了，先试一批。黄了再救，不如开始就防——配方，是变黄的源头。
TPE 颜色是品质关：变黄、发乌都是问题。配方对了，颜色才稳——品质关，别省助剂。
老化是变黄的推手，为什么先看配方
TPE 变黄先看老化：光照、高温、氧。老化测试写进验收——老化，是变黄的推手。
基材影响抗黄：SEBS 基抗黄好。基材选对，黄变减半——基材，是变黄的基础。
助剂影响抗黄：抗氧剂、光稳定剂。助剂对了，黄变推迟——助剂，是变黄的防线。
基材、助剂、色粉，哪里在黄
基材：氢化度高抗黄好。基材氢化度，是抗黄的地基。
助剂：抗氧剂按需加。助剂不足，黄变早——助剂，是变黄的防线。
色粉：无机色粉耐老化。色粉选对，变色慢——色粉，是颜色的稳定器。
抗黄配方，一张表对照清楚
| 配方 | 抗黄 | 成本 |
|---|
| 普通 | 一般 | 低 |
| 加抗氧 | 好 | 中 |
| 加光稳 | 好 | 中 |
| 全配 | 优 | 高 |
表格读法：抗氧剂和光稳定剂按老化要求配，成本跟着升——变黄是慢变量，配方阶段就得防。
按场景配，黄变才少。
放半年不发黄，验收测这四项
| 项目 | 要求 | 判断 |
|---|
| 老化 | 测试 | 达标 |
| 基材 | 选对 | 达标 |
| 助剂 | 配齐 | 达标 |
| 色差 | ΔE<1 | 达标 |
表格读法：基材耐黄、助剂抗氧、加工温度逐项核——颜色牢不牢，先拿一批试片加速老化。
配方，是变黄的根子。
黄了再救，为时已晚配方先输
坑一：黄了再救。出货后才发现变黄，换料返工来不及——抗黄方案在打样期就得上。
坑二：老化不测。变黄——老化测试必做。
坑三：助剂省。黄变早——助剂按需配。
抗氧、耐候、色粉——配色前问清
三问：什么体系、什么场景、色差按多少。一验：加速老化实测——三问一验，供应商底细清楚。
配方验证要先行：先试一小批做加速老化，颜色过了再放量。先试一批，再谈放量——配方，是变黄的根子。
留样要成习惯：每批留样，颜色按批次复测。批次换料先对比再放量——批次稳，客诉少。
发黄、变色、斑痕：故障对照一张表
| 现象 | 原因 | 对策 |
|---|
| 变黄 | 老化 | 加助剂 |
| 变黄 | 基材差 | 换基材 |
| 变黄 | 助剂省 | 配齐 |
| 发乌 | 填充多 | 降填充 |
| 色差 | 批次漂 | 锁批次 |
新料白净，放货架三个月发黄，客户以为旧库存——UV老化是变黄的头号推手。 户外、光照位必须加氢化光稳，不然白件越晒越黄。
变黄别先骂色粉，80%是基材和抗氧没配齐。 普通料只加抗氧，加光稳才挡紫外线，全配方才扛得住长期光照。
色差ΔE压到1以内才算过，日用白件半个色号消费者一眼看穿。 先打色样确认老化前底色，再谈量产，低价料杂质多色点多。
发黄是TPE的“晒黑”，自由基在紫外线里慢慢跑。 抗氧加光稳双管，白件才扛得住长期光照，不是出厂白就一直白。
老化放样90天表面零黄变、ΔE稳定，白件出货不再背“旧料”投诉。 验收按加速老化后色差核，新料白不算数。
白件变黄先查光稳定剂，不是抗氧加够就行。SEBS基白件受阻胺光稳定剂UV-770要加到0.3%以上，户外暴晒300小时色差ΔE收进2.0以内才算过。
耐黄变看氢化度不看牌号，SEBS氢化率超98%才扛长期光照
。低氢化或回收SEBS做白件三个月就发黄发暗，色粉里迁移物也会加速黄变，先打色样确认老化前底色再谈量产。
抗氧加光稳双管白件才扛长期光照，不是出厂白就一直白。1010抗氧加UV-770光稳，户外300小时色差ΔE≤2.0，白件验收按老化后底色核。
普通料只加抗氧加光稳才挡紫外线，全配方才扛长期光照
。先打色样确认老化前底色再谈量产，低价料杂质多色点多，白件验收按老化后色差ΔE≤2.0核。
抗氧1010加氢化光稳UV-770双管，白件才扛长期光照。出厂白不代表一直白，验收按老化后色差ΔE≤2.0核，低价料杂质多色点多。
科隆客户案例：低温开裂整批废，留样数据合格率98%
深圳一家注塑加工厂，TPE 件低温下一批开裂，整批报废。科隆配合提供同批次留样与物性数据，批次合格率稳定在 98% 以上。留样加数据，批次问题一次说清——开裂问题，先看留样数据。
小结
TPE变黄的处理，配方先查，老化再测，变色从配方就输了先试一批，配方是根子。
The material turns yellow after two months, and the customer says it's not new material. The discoloration is already lost from the formula stage and can't be fixed later.
It turns yellow after just two months; it's not old material, it's that the antioxidant wasn't added.
TPE turns yellow and discolored, and the formula determines its color fate: base material, additives, aging. Conclusion first: once it yellows, it's too late to save it; anti-yellowing must start from the formula—the formula is the root cause of yellowing.
The biggest trap of TPE turning yellow: the discoloration is already lost at the formulation stage, so test a batch first. Trying to fix it after it yellows is not as good as preventing it from the start—the formulation is the source of yellowing.
TPE color is a quality checkpoint: yellowing and dullness are both problems. Only with the right formula will the color be stable—quality is key, don’t skimp on additives.
Aging is the driving force behind yellowing, so why look at the formula first?
First check aging when TPE turns yellow: light, high temperature, oxygen. Include aging tests in the acceptance criteria — aging is the driver of yellowing.
Substrate affects yellowing resistance: SEBS substrate has good yellowing resistance. Choosing the right substrate can halve yellowing — the substrate is the basis for yellowing.
Additives affect anti-yellowing: antioxidants, light stabilizers. When the right additives are used, yellowing is delayed — additives are the defensive line against yellowing.
Base material, additives, color powder, where is it turning yellow
Substrate: High hydrogenation degree, good yellowing resistance. The hydrogenation degree of the substrate is the foundation for yellowing resistance.
Additives: Add antioxidants as needed. If additives are insufficient, yellowing occurs early — additives are the line of defense against yellowing.
Pigments: Inorganic pigments are resistant to aging. Choosing the right pigment slows color change—pigments are the stabilizers of color.
Anti-yellowing formula, clearly compared in one table
| Recipe | Anti-yellowing | Cost |
|---|
| Ordinary | general | Low |
| Add antioxidants | Good | middle |
| Increase light stability | Good | middle |
| Full set | excellent | Tall |
Table reading: Antioxidants and light stabilizers are formulated according to aging requirements, and costs rise accordingly — yellowing is a slow variable and must be prevented at the formulation stage.
Match according to the scene, and there will be less yellowing.
Doesn't turn yellow after being stored for half a year, check these four items for inspection
| Project | Requirement | Judgment |
|---|
| Aging | Test | Meet the standard |
| Substrate | Choose correctly | Meet the standard |
| Additive | fully equipped | Meet the standard |
| Color difference | ΔE<1 | Meet the standard |
Table reading method: Check the substrate's yellowing resistance, additive's antioxidant properties, and processing temperature one by one—whether the color is fast or not, first take a batch of test pieces for accelerated aging.
The formula is the root that turns yellow.
Once it's ruined, saving it is too late; administer the formula first.
Pitfall 1: Trying to fix it after yellowing. It's only discovered to be yellow after shipping, and there's no time for material replacement and rework—the anti-yellowing solution must be implemented during the sample testing phase.
Pitfall 2: Unexpected aging. Yellowing — aging tests must be conducted.
Pitfall 3: Saving on additives. Early yellowing occurs — additives should be mixed as needed.
Anti-oxidation, weather resistance, color powder — ask before mixing colors
Three questions: what system, what scenario, and how much color difference. One test: accelerated aging actual measurement — three questions and one test make the supplier's details clear.
Formula verification must come first: start with a small batch and perform accelerated aging; only if the color passes should you increase the volume. Test one batch first, then discuss scaling up—the formula is the root cause of yellowing.
Make sample retention a habit: retain samples for each batch, and retest the color by batch. When changing materials for a batch, compare first before scaling up — stable batches lead to fewer customer complaints.
Yellowing, Discoloration, Stains: A Fault Comparison Table
| Phenomenon | Reason | Countermeasure |
|---|
| Turn yellow | Aging | Add an additive |
| Turn yellow | Poor substrate | Change substrate |
| Turn yellow | Auxiliary agent province | fully equipped |
| Grow gray | More filling | Reduce Padding |
| Color difference | Batch bleaching | Lock batch |
The new material is bright white, but it yellows after sitting on the shelf for three months, and customers think it’s old stock — UV aging is the number one culprit for yellowing. For outdoor and sun-exposed positions, hydrogenated light stabilizers must be added, otherwise the white parts will yellow more the longer they are exposed.
Don't blame the pigment when it turns yellow; 80% of the time it's because the base material and antioxidants aren't properly matched. Ordinary materials only include antioxidants; adding light stabilizers blocks ultraviolet rays, and a complete formula can withstand long-term exposure to light.
Color difference ΔE must be within 1 to be considered acceptable; consumers can notice a half shade difference in everyday white items at a glance. First, make a color sample to confirm the base color before aging, then discuss mass production. Low-cost materials have more impurities and color spots.
Yellowing is TPE's 'tanning,' with free radicals slowly running around in ultraviolet light. Using both antioxidant and light stabilizer, white parts can withstand long-term exposure to light; just because it's white at the factory doesn't mean it will stay white.
After aging sampling for 90 days, the surface shows no yellowing and ΔE remains stable. Shipments of white parts no longer receive complaints about 'old material.' Acceptance is based on color difference after accelerated aging; new white material is not counted.
If white parts turn yellow, first check the light stabilizer; it's not enough just to have enough antioxidant. SEBS-based white parts require hindered amine light stabilizer UV-770 to be added to more than 0.3%, and the color difference ΔE must be controlled within 2.0 after 300 hours of outdoor exposure to be considered acceptable.
To resist yellowing, look at the degree of hydrogenation, not the grade. SEBS can only withstand long-term exposure to light if the hydrogenation rate exceeds 98%.
Low-hydrogenated or recycled SEBS used for white parts will yellow and darken within three months. Migration from color pigments will also accelerate yellowing. First, make a color sample to confirm the base color before aging, then discuss mass production.
Only white parts with added antioxidants and light stabilizers can withstand long-term exposure to light; factory-new white does not stay white forever. 1010 has added antioxidants and UV-770 for light stabilization. After 300 hours outdoors, the color difference ΔE ≤ 2.0. White parts are accepted based on the base color after aging.
Ordinary materials only block UV rays when antioxidants and light stabilizers are added, while the full formula can withstand long-term exposure to sunlight.
First, make a color sample to confirm the base color before aging, then discuss mass production. Low-cost materials have more impurities and color spots. Acceptance of white parts is based on a color difference ΔE≤2.0 after aging.
Anti-oxidant 1010 combined with hydrogenated light stabilizer UV-770 works together; only white parts can withstand long-term exposure to light. Being white at the factory does not mean it will always stay white. Acceptance should be based on a color difference ΔE≤2.0 after aging. Low-cost materials contain more impurities and more color spots.
Cologne Customer Case: Entire Batch Scrapped Due to Low-Temperature Cracking, Sample Data Pass Rate 98%
A Shenzhen injection molding factory experienced a batch of TPE parts cracking at low temperatures, with the entire batch scrapped. Cologne cooperated by providing samples and physical property data from the same batch, and the batch qualification rate remained steadily above 98%. With samples and data, batch issues can be clarified at once—regarding the cracking issue, first look at the sample data.
Summary
Handling TPE yellowing, first check the formula, then test after aging. Discoloration is already lost from the formula, try a batch first; the formula is the root cause.
