Shanghai Zhishengliu Industry & Trade Co., Ltd. is an enterprise integrating scientific research, production and sales. Over the years, the company specializes in the research and production of various types of special inks and other products.
After careful observation and research on the marker ink, the company found that the solubility of the dye and resin in the marker ink has a great influence on the performance of the marker ink, especially stability. The company's solvent selection and formulation improvements not only make it easier to prepare marker inks, but also improve product stability, storage performance, and intermittent writing. Here, the selection of the solvent and the improvement of the formulation are discussed.
First, the problem of the marker can be made in paper, wood, metal, glass, plastic, enamel, ceramics and other writing media on the mark or logo [1]. The marker has a watermark marker and an oil marker. This article mainly talks about the ink preparation problem in oily markers.
Oily marker inks are primarily made from alcohol soluble dyes, resins, auxiliaries, and solvents. It is not only required to be rich in color, stable in suspension, good in adhesion, but also has certain standards in water resistance, light fastness, temperature resistance and intermittent writing. Due to the requirements of these physical and chemical properties, solving the solubility of the dyes and resins in the ink or the efficient dispersion and emulsification of the ink becomes the key to the quality of the marker ink. Therefore, it is very meaningful to explore the solubility of dyes and resins in the preparation and improvement of marker ink formulations and processes.
Second, the method to improve the solubility of dyes and resins, the general method to improve the solubility of dyes and resins is nothing more than the following
1. Purification of dyes and resins
2, choose the right solvent
3, adjust the pH value
4, adding a solvent
5, optimize the surfactant
6, mechanical pulverization of dyes and resins and strong stirring of the solution
7. Ultrasonic Chemical Co-Solution These seven methods have their own strengths. You can't just choose one method to solve all the dissolution problems in the marker ink. In order to use one or more methods in a single system experiment of the marker ink, it is better to solve the problem of the dissolution of the ink of the system, and then obtain a better quality ink. The application of these seven methods will be introduced one by one below.
1. Dye and Resin Purification China's dye industrial products are mostly used in the textile and printing and dyeing industries. Therefore, the removal of impurities or some additives in the products is mainly based on the needs of textile and printing and dyeing industry users. The direct application of these dyes or color materials is largely unfavorable for ink performance [2]. How to remove the unwanted substances in the dye by purification is the key to producing high quality inks. For example, in the dye industry, Yuanming powder (Na2S04) is deliberately added as a dyeing agent, but the ink in the ink is an impurity, and in most cases it must be removed to obtain a better ink. Under normal circumstances, BaCl2 can be added to the dye solution, and stirred well for 2 hours to make the following reaction.
Na2S04+BaCl2=BaS04+2NaCI
Complete [4]. This achieves the purpose of removing Na2S04 or partial removal from the dye.
2. Choosing the right solvent Generally, the dye and resin are solid or viscous liquids, making it difficult to make the desired ink. Dissolving the solvent liquefies the dye or resin to improve uniformity and leveling.
The solvent for selecting the dye and the resin can be carried out according to the principle of close polarity, and therefore the benign solvent of a certain dye and resin must be a liquid having the same or similar polarity. Chemists have selected the solvent method to check the SP value (solubility parameter) of the dye and resin and the solvent. The closer the SP value of the solvent to the dissolved substance, the better the compatibility (3).
3. Adjusting the pH value The solubility of some substances is very sensitive to pH, it dissolves at pH<7, and does not dissolve well at pH>7; vice versa [4)o Because the solvent of oily marker is organic such as alcohol Solvent, so it is best to use an organic acid and an organic base for the acid or base to adjust the pH.
4. Adding a co-solvent According to the study [5], in the dye industry, the co-solvent comprises three components: one is a high-boiling cosolvent, and is generally a glycol. The second is to provide a catalyst for the condensation medium to accelerate the condensation rate. The third is a complexing agent that can complex with metal ions. It is convenient and practical to use the first and third auxiliary solvents in the process of making the ink.
5. Optimized surfactants According to the principle of similar compatibility, in the process of ink production, it is necessary to select a surfactant which has both a dye dye and a resin group and a solvent-friendly group, so that not only can it have a good wettability effect, but also Provides good solubilization (each surfactant has wettability and dispersibility). Which surfactant is selected depends on the research object [6].
6. The mechanical force pulverizes the dye and resin and the strong agitation in the solution proves that the dye and the resin are mechanically pulverized (ball milling, grinding or colloid milling), and then placed in a solvent to easily prepare a stable solution [7].
7. Ultrasonic chemical method The solubilizing ultrasonic chemistry method uses ultrasonic cavitation energy to accelerate the molecular motion of solute and solvent, thereby accelerating the dissolution of solute (C8). Dye, resin and solvent in the ultrasonic field, not only the dissolution of dyes and resins is significantly accelerated, but also the solubility is increased (chemists often dissolve polymer materials in the laboratory). The application of ultrasonic chemistry in ink preparation needs to be further explored.
Third, increase the solubility of dyes and resins Method in the production of marker inks due to environmental and cost requirements, alcohol is still selected as the main solvent for the production of marker ink. Thus, the choice of co-solvents and surfactants in chemical methods and the control of pH are the primary means of increasing the solubility of dyes and resins.
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