Method for preparing ink for novel erasable ballpoint pen

According to statistics from the customs department, in June 2001, the foreign exchange value of China's ballpoint pens was US$66.27 million, which was the highest among various types of pen products. It can be seen that ballpoint pens occupy a very important position in Chinese pen products. The wide use of ball-point pens has led people to study how to further improve its performance and functionality. In the 1980s, a new type of ball-point pen, the erasable ballpoint pen, was introduced. It not only has the advantages of traditional ball-point pen writing fluency and portability, but also It also has a pencil-like erasability and long-term preservation.

The erasable ballpoint pen ink must meet the following requirements: It must have enough film-forming property to make it adhere to the surface of the paper, and it is not easy to peel off, but it can be wiped off with an eraser; the colorant has good dispersibility and good adhesion to the film former. , With the filming agent wiped off the surface of the paper, the color requirements of a long-lasting, good weather resistance; to have enough fluidity to make it write under a certain pressure conditions; also have long-term storage stability. Now there are foreign countries that have used this type of ink to inject ballpoint pens. There are also some domestic patent reports, but no finished products have been produced yet. The market sees imports. The price is more expensive. The price of a pen is about 8 yuan; there are a large number of domestic students. The demand for erasable ballpoint pens is large. Therefore, the erasable ballpoint pen ink is a very valuable project.

First, materials and methods

1. Materials The main components of the erasable ball point pen ink formulation include dyes, film formers, solvents, dispersants and other additives. The amount of additives is very small, but it plays an important role in improving the overall performance of the ink.

2. Methods (1) The dyes and film formers will be crushed.
(2) The solvent is added to the reactor, stirring is started and the temperature is raised to a certain temperature.
(3) Add the film former and some additives and stir at a certain temperature until all the film former and additives have dissolved.
(4) Add the dye in batches and stir until completely dissolved.
(5) Add the remaining portion of the additive and mix by stirring at the above temperature for about 1 hour.
(6) The ink at the above temperature is filtered through a vacuum filter.
(7) Search for the filtrate, which is the product.

Second, the results and discussion

1, the role of dye dyes is to give the ink a sufficient depth of color, the ballpoint pen ink used in dyes can be divided into oil-soluble dyes and alcohol-soluble dyes, the dye used in this test is phthalocyanine dyes, the dye is insoluble in solvents, in the ink Good dispersion, strong adhesion to the film former, so it does not penetrate the inside of the paper, and the color should be bright color, good weather resistance.

2. Film Forming Agent Film former is an important part of the ink for erasable ballpoint pens. Its main function is to form a uniform film on the surface of the paper and serve as a dye carrier. It is required to have a certain adhesion to paper, and it is not easy to peel off, but it can be wiped off with an eraser, and it has strong adhesion to the colorant, good solubility in solvents, and stability with other components, and can be stored for a long time. . In this experiment, rubber-like film formers were used.

3. Solvents In erasable ballpoint pen inks, the role of the solvent is to dissolve the dyes, film formers and be compatible with various types of additives to provide a certain degree of fluidity, but also have the right volatile, in the writing process Effectively control the drying speed. Experiments show that the use of a co-solvent is better than a single solvent. In this experiment, a solvent-solvent system with solvent A: solvent B=1:1.5-2.5 was used, and the effect was the best.

4. Dispersing Agents A suitable amount of dispersant can reduce the adhesion of the ink and the paper surface, so that the ink can be rubbed in a certain period of time when written on the surface of the paper, and the dispersant can also maintain the writing fluency and long-term stability of the ink. The substances used in this experiment were mixtures of phthalic acid esters and ethylene glycol esters in certain proportions.

5. Other additives (1) Lubricants and corrosion inhibitors

In the ink component, fatty acid is usually used as a lubricant, and the lubricant is a cosolvent at the same time. The functions of the lubricant include: A. Lubricating the ball and providing fluent writing. B. Preventing the ink from drying. The ballpoint pen has stable and good initial conditions. Pen performance; C, increase the depth of dye dissolution, improve dye color. The introduction of fatty acids is corrosive to certain nib metals, such as copper alloys, causing an inhomogeneous crystalline material in the ink to clog the channels, thereby shortening the life of the ballpoint pen. The use of fatty acids supplemented with corrosion inhibitors can solve corrosion problems while meeting lubrication requirements. The corrosion inhibitors used in the experiments were dissolved in fatty acids in a saturated state to achieve anti-corrosion purposes.


(2) Antioxidants and anti-drying agents

Another reason for the formation of agglomerated plugs and crowns in ballpoint inks is the oxidation of the brass and the interface and the formation of copper and zinc compounds in the solution. The antioxidants contain substances that can absorb and absorb ambient oxygen, and therefore can effectively prevent oxidation. The use of antioxidants and corrosion inhibitors can more effectively prevent or inhibit the corrosion of copper alloys. Experiments have shown that the antioxidants we use are effective. good. In the experiment, we also used anti-desiccant, the main role is to prevent the ink surface or ink oxidation drying, so that ink and ink have a better visual effect, while extending its use and retention period, in the application can also improve the ballpoint pen Performance, anti-drying agent is also an antioxidant.

Third, the conclusion

1, the basic ingredients of the formula dye 5%-25%
Film former 5%-15%
Solvent 30%-60%
Dispersant 5%-20%
Other additives 2% -10%

2. The erasable ballpoint pen ink prepared by the above method has comparable erasability as the imported sample, bright color, good weather resistance, and long-term stability. Its particle size and viscosity can be appropriately adjusted according to the needs of various ballpoint pens to achieve its best flowability and best erasability.

Source: Knowledge Network

We as a professional provider of sit standing desks have a variety of accessories that perfectly fit our Electric Height Adjustable Desk, Hand Crank Height Adjustable Desk, Standing Desk Converter, Movable Standing Desk , Lifting Column , and TV Lift / Cart . The accessories include different options of feet, control box, hand controls, cable management tray, etc. We attach importance to our clients, with our 24-hour fast responding after-sales service, and also with our quality accessories that have a life 3 years longer than other suppliers.


Standing Desk

Standing Desk Accessory

Standing Desk Accessory,Standing Desk Frame,Desk Stand,Desk Height Adjuster

Shaoxing contuo Transmission Technology Co.,Ltd , http://www.electricdesk.nl