Whiteboard pens are popular office and teaching writing tools in the world in recent years. Whiteboard ink is a new type of writing ink that can be written on a non-absorbent hard surface with a smooth surface and is easily erased. It has been produced in more than 20 years abroad. The performance of the whiteboard pen ink has also undergone continuous improvement and development over the past decade, resulting in a qualitative leap in process and production, particularly as a solvent for the main component thereof, which has been made from earlier toxic ketones, esters, benzene The class and its mixtures develop into low-toxic alcohols. The countries that can produce high-quality whiteboard pen ink in the world include Japan, the United States, and Germany. In recent years, South Korea has also become a major producer. The development of whiteboard pen ink in China started in the early 1980s. In 1984, trial products were put on the market, but it was not long before the production was suspended due to quality problems [1]. The medium-to-high-end whiteboard ink required by the Chinese market is still mainly dependent on imports. The development of whiteboard pen ink is a comprehensive subject connected with organic synthesis chemistry, colloid chemistry, surface physics and other multidisciplinary disciplines. It requires modern chemical analysis and physical detection methods to match; due to its high technical content, almost all In order to monopolize the technology in this field, whiteboard pen ink producing countries adopt a technology-enclosed strategy, and the key technologies are never transferred (transferred). Therefore, the performance of each country's whiteboard pen ink has its own characteristics. Whiteboard pens are commonly used in teaching and office areas such as classrooms, buildings, shops, and enterprises, and are written with a whiteboard pen. The lines are smooth and colorful. The ink can be wiped with ordinary dry cloth or soft paper without leaving marks. Due to the user's habits and convenience, it not only has a higher requirement for the erasability of the handwriting, but also places a higher level of writing on its intermittent writing (ie, off-hat moisturizing, and some foreign materials are also known as anti-drying or anti-drying time). The expectations, especially in the use of high-end environment. As far as the domestic and foreign samples collected by the author at present in the country, due to the limitation of the technical level, intermittent writing can really reach 8 hours. It is indeed rare. To this end, we conducted targeted technical research. The whiteboard pen ink system was tested several times, and different preparation experiments were conducted on the moisturizer. The results were encouraging. After the homemade moisturizer was added to the whiteboard pen ink we developed, the whiteboard pen ink was intermittent. Writing reached 24 hours (at 50% humidity and 22°C conditions) (see Table 1), and the instantaneous erasability was still in line with corporate standards [2]. Table 1 List of Intermittent Writing (ie, Uncapping Moisturizing) Tests ┌────┬────┬──────┬────────────────────────── │ Producers │ D │ E │ H │ China │ ├────┼──────┼──────┼──────┬──────┼────┤ │Company name │ A │ B │ C │ D │ Shanghai Yi Tong │ ├────┼──────┼──────┼──────┼──────┼────┤ │ Intermittent writing │ 2-4 hours │ 10 hours │ 6-8 hours │ 6-day hours │ 24 hours │ ├────┼──────┼──────┼──────┼──────┼────┤ │Can be erased instantly │OK │ Slightly pasteboard │ Pasteboard │ Slightly cheeky │ OK │ ├────┼──────┼──────┼──────┼──────┼────┤ │ │ │ Hue is not good, guest │ │ can be immediately erased │ │ │ Description │ │ │ │ │ │ │ │ │ difficult to accept │ │ better than C company │ │ └────┴──────┴──────┴──────┴──────┴────┘ How to effectively improve the time of writing intermittently (without capping and moisturizing) of the whiteboard pen ink has been a major technical bottleneck in the ink production of the whiteboard pen. The ordinary writing time of ordinary whiteboard pen ink is about 2 hours. If a specific humectant is added to the ink, the time of intermittent writing will be prolonged; but this will directly affect the other of the whiteboard ink. Performance indicators - instantly erasable. The so-called instant erasable is that after writing with a whiteboard pen, the ink is quickly dried in a short period of time and erased without leaving marks. The role of the moisturizer is to maintain a certain degree of humidity in the ink system, and to form a protective film on the surface of the pen tip, etc., which is exposed to the air, to make it moist. Even if you do not wear a cap, the pen will not dry up when exposed to the air; when you write, gently break the film and you can still write normally. This is a contradiction that confronts each other, acts in the opposite direction, and is irreconcilable. This also reflects the high difficulty of this technology. This article mainly discusses from the following aspects: First, a suitable system Different powders, even the same brands, and different manufacturers, will also have different performances in adapting to the system due to differences in the production process and origin of raw materials. This shows that a suitable system is crucial. The first thing to consider in the entire whiteboard pen ink system is safety and environmental protection. Low (non-toxic) and harmless solvents are necessary. Due to the high erasable requirements of the whiteboard pen ink, the common system is based on solvents with high volatility and low boiling point. Such solvents are generally not easy to moisturize, so it is acceptable to add appropriate amounts of high boiling solvents, such as n-butanol. Polyhydric alcohols such as glycerol, propylene glycol, ethylene glycol, diethylene glycol, and epoxidized soybean oil, or higher alcohols and higher fatty acid esters and their derivatives. This can not only improve the writing performance of the marker, but also play a role in assisting moisturizing, and often can achieve a multiplier effect. Second, a reasonable amount of added The nature of the chemical structure of the moisturizer determines that it will inevitably have a negative impact on the instantaneous erasability of the handwriting, so it is necessary to do a preferred test on the amount of the added moisturizer, and to filter out the appropriate amount of addition, which can meet the intermittent writing (moisturizing) The requirement does not directly affect the immediate erasability of the handwriting too much, thereby ensuring that its negative impact on the instantaneous erasability of the handwriting is within an acceptable range. In this test, we used the same batch of color paste (homemade) and added different doses of moisturizer (homemade) in the same system. The results are as follows (see Table 2). After screening, the results show that the amount of added It is more suitable for 1-3% of the total amount. Table 2 Effect statistics of different amounts of moisturizers added ┌────┬────┬──────┬────┬──────────────────────────── │ Moisturizer │ 1% │1. 5%│ 2% │2. 5% │ 3% │ 3. 5% │Add │ │ │ │ │ │ ├────┼────┼──────┼────┼────┼──────────────┤ │ Intermittent writing │ 6 hours │ 10 hours │ 18 hours │ 24 hours │ 28 hours │ 30 hours │ ├────┼────┼──────┼────┼────┼──────────────┤ │ Instantly │ OK │ OK │ OK │ OK │ OK │ Slightly │ └────┴────┴──────┴────┴────┴──────────────┘ After the addition, it only needs to stir (300 rpm) for 0.5 hours to reach the dispersion requirement. The humectant should be friendly to the entire ink system, with similar polarity and good mutual solubility, which is beneficial to dispersion and give full play to its efficacy. In addition, the amount of moisturizer added is closely related to the ink system, and different amounts of ink should be added to different ink systems. If you add less, the effect of intermittent writing (moisturizing) is not obvious; if you add more, the time for intermittent writing will be extended, but it will inevitably affect the immediate erasability of handwriting, resulting in paste. Third, different timing for joining Ink production is generally divided into two units: color paste preparation and finished product preparation. The addition of moisturizer can be added in the color paste preparation unit, or can be added in the finished product preparation unit. This is mainly based on the whiteboard pen ink system, color and moisturizer. Depending on the difference, if the choice is wrong, the effect will be very different. Adding a humectant during the preparation of the paste facilitates dispersion and makes it more homogeneously miscible with the system and exerts its effect, but sometimes it loses its function due to excessive sanding (crushing), making the process more difficult to control. When the finished product is formulated, the addition of a moisturizer can effectively avoid the failure of its function, but it can also be due to poor dispersion, so that the efficacy can not be fully and reliably exerted. Conversely, it not only affects the immediate erasure of the handwriting, but also Can cause different degrees of precipitation in the ink system. Therefore, we must have detailed and reliable experimental data for technical support in order to make the right choice. Fourth, scientific judgment In the intermittent writing (ie, off-hat moisturizing) test, it sometimes happens that when writing, there are dry pens (that is, the ink is not smooth, and the degree is different). Due to the lack of a unified standard, their judgments vary from person to person, and their operability is extremely poor. How can this be determined? We have done a considerable amount of experimentation, and we have come to the conclusion that it depends on recovery (re-wearing) After the situation is judged again. Because the effects of different environments (temperature, humidity, ventilation, lighting, etc.) are sometimes affected during the intermittent writing (ie, the cap moisturizing) experiment, some deviations in the results may occur. But as long as the system is not really destroyed, as long as the recovery is given for the appropriate time (appropriately 0.5 hours for recap), the writing effect will be significantly improved; if the system has been destroyed, even if given sufficient time to recover (Re-wearing caps, generally bounded by 2 hours), the writing effect will not improve. Therefore, this is a clear dividing line. According to this judgment, it is possible to reduce the deviation caused by the aforementioned environmental influences and, more importantly, to improve the operability of the judgment. The rational application of moisturizer is one of the core technologies in the production of whiteboard pen ink. The intermittent writing of whiteboard pen ink has reached more than 24 hours, which also marks the first time that China’s whiteboard pen ink surpasses international similar products in key technical indicators. For China's whiteboard pen ink to high-end international market, but also for China as soon as possible to become a powerful pen technology provides technical support. Regardless of the self-development of the pen-making industry, or the national strategy of independent innovation and sustainable development, speeding up the development of ink and improving the quality level is an urgent task for the industry. Therefore, domestic whiteboard inks with independent intellectual property rights are expected to receive support from the industry. They also need to be supported by everyone to jointly improve the international competitiveness and anti-risk capabilities of our national pen-making industry so as to ensure that the Chinese pen-making industry can truly To achieve sustainable development. AD: [Office Solution Center] OfficeMate Office Partner Mall