Help: How to remove the oxidation marks left by tape on paper! (Unsolved, prize for a solution! ）
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Update on April 3: If any friend comes up with a solution to this problem, and if that solution proves effective, a reward of 50 yuan worth of credit for China Mobile or China Unicom will be given as a small token of appreciation. Promises must be kept! ! ! If possible, please ask the moderator to highlight the topic; thank you! First, thank you to the friend on floor 2 for their suggestion; it’s because I haven’t described the problem more clearly yet. Let me add a few key points (the essence) regarding this issue: The core problem is that the adhesive in the tape comes into frequent contact with oxygen in the air over time, which causes it to yellow and harden; of course, its adhesiveness is lost by then. The key is to remove the color that results from the adhesive of the tape remaining on the paper – that dried and yellowed color – so that it returns to its original colorless state. It is possible to do this without erasing, with little impact on the paper; of course, it should also not leave new marks. The adhesive used is also the most common type, and this phenomenon is quite frequent in everyday life. For details of the issue, please see the original post below. Another point is whether this problem can be solved or not; in my opinion, it can be solved to a large extent. I still believe very much that there are reagents that can cause immediate changes in response. Tests have shown that those that currently have no effect on this issue are: alcohol, turpentine, pine oil, highly pure hydrogen peroxide, and potassium permanganate + oxalic acid. Reagents that \"may\" possess such chemical properties also show no effect on this problem. 4.2 Original post: Before asking everyone this question, I’d like to say a few words first. This issue has been bothering me for quite some time now, and I really hope to get an answer to it. Those who come to read this post, please take the time to read it carefully and offer me as much guidance as possible. I am extremely grateful! Questions I would like to ask: 1. What is the adhesive component in the transparent tape we use most often (the one about 1 CM wide)? It’s not tape. 2. How to remove the yellow stains caused by oxidation of the tape remaining on the paper? The adhesive used is the most common type mentioned above (about 1 CM wide). This issue gives rise to several related questions: The key point is that the adhesive was applied to the back side, but now it’s affecting the front side as well. Description of the problem: (there are pictures available). The adhesive has been on the paper for several years; in the areas where it’s applied, yellow stains have appeared, likely due to oxidation of the adhesive. Now the tape comes off with just a light touch, but the yellow mark remains on the paper. The yellow spots also resemble rust spots. Back view of the phenomenon: Front view of the phenomenon: My analysis: I think it’s mainly the adhesive that has oxidized, and then the paper, in contact with the oxidized part of the adhesive, undergoes other reactions. As far as I can tell, the texture of the paper hasn’t changed, so it’s unlikely that the paper itself has oxidized. If the paper has oxidized to this extent, it will take many years before it can be restored to its original state. Treatment methods that have been tried so far include turpentine, pine oil, highly pure hydrogen peroxide, and oxalic acid – but none of these were effective. Treatment methods I am considering trying now are the use of calcium hydroxide, sodium hydroxide, or other organic solvents. I would greatly appreciate any guidance you can provide! Key point: It’s not necessary to remove everything completely; it’s sufficient to just eliminate the impressions on the front side. This is the core of the entire issue. . This post was last edited by aqhjzy on 2009-4-3 18:58 ]
Let’s spread knowledge about tape :) Materials of tape: 1. Backing – mainly OPP, PVC, PET, PE, etc.; in China, BOPP is commonly used. 2. Adhesive – the main materials are natural (synthetic) rubber and acrylic. On May 30, 1928, applications were filed in the UK and the US; Drew developed a very light adhesive that stuck together when pressed, and later improvements led to the invention of transparent tape. Why can tape stick to things? Of course, it’s because there is a layer of adhesive applied to its surface! The earliest adhesives came from animals and plants; in the 19th century, rubber was the main component of adhesives ； In modern times, various polymers are widely used. Adhesives can stick things together because bonds are formed between their own molecules and the molecules of the items to be bonded, and these bonds hold the molecules firmly together. The components of adhesives vary depending on the brand and type, with various polymers used. Introduction to tape: BOPP (bially oriented polypropylene) tape is an essential item in the daily use of any enterprise, company, or individual. **There is yet no comprehensive standard for the tape industry; only one industry standard exists, namely QB/T 2422-1998 for BOPP pressure-sensitive adhesive tapes used for sealing boxes.** Adhesive tape is made by starting with BOPP base film, roughening one of its surfaces through high-voltage corona treatment, applying glue to it, and then cutting it into small rolls – this is the adhesive tape we use in daily life. Adhesive tape glue is an acrylate adhesive, also known as pressure-sensitive adhesive, with resin as its main component. Tincture fat is a high-molecular-weight active substance, and temperature has a certain impact on the activity of its molecules. The tincture content of the glue directly affects the performance of the tape. The initial adhesive strength of normal box-sealing tape is between grade 13 and above (on the steel ball scale), and the thickness of the adhesive in such tape is generally 22 microns. It is at the standard thickness. Adhesives can be classified according to their functions into: high-temperature adhesives, double-sided adhesives, insulating adhesives, special adhesives – pressure-sensitive adhesives, and die-cut adhesives. Different functions meet the needs of various industries. You can try the following methods: 1. Use a mixture of soap along with a small amount of ammonia and turpentine; this can remove many types of stains and give the glass surface a brighter shine (this method works well on tiles, ceramics, glass, etc.). 2. Repeatedly stick and peel off with transparent tape that has good adhesion to remove some of the substance from the surface. 3. Wipe it away with a little ammonia water, or paint thinner can also be used. 4. Use a hair dryer to dry it, and then gently scrape it off. 5. Dab a cotton swab in nail polish remover and wipe it on. 6. Wipe with peppermint oil. 7. Wipe with a specialized cleaner or sports shoe stain remover. 8. A 4B eraser, the kind used for drawing – a very soft Korean eraser – can be used to erase it. 9. If the marks have remained for a long time and have hardened, you can first use a warm towel to soften them before trying again
Thank you so much to friend LS for their thoughtful reply!:handshake
It is recommended to try using a mixture of organic solvents such as ethanol and sodium hydroxide
The main components used for removing adhesive are usually aromatics such as toluene, trimethylbenzene, tetramethylbenzene, as well as mixtures of kerosene. If the original poster can find these substances, they can be tried out; they are very effective at removing the residual adhesive left behind after peeling off recently applied transparent tape. It’s not clear whether they will be effective in the original poster’s case