02/04/2019

Accompanied all the way, grateful to walk, Yuhong Chemical wishes you a happy Chinese New Year and a blessed pig year!

Dear customers: The dog protects Qianxiang chasing the sun, and the pig embraces the blessings. On the occasion of the Spring Festival, I wish you and your family a happy Chinese New Year, good health, and a happy family. Business is like spring, and money is like water!

01/06/2019

How to choose the right organic pigments

The organic pigment industry technology not only includes the chemical reaction of organic pigment and its intermediate synthesis unit, but also involves the chemical structure of the solid particle surface of the organic pigment, the existence of specific substituents on its physical and chemical properties and applications (such as: color, light and weather fastness) , Heat stability and molecular polarity, etc.). Organic pigments are insoluble in the applied medium and color the substance with fine particles with specific surface characteristics. According to the specific requirements of various applications, organic pigments can have the same chemical structure to prepare varieties with different application properties to achieve good results. Organic pigments usually used for coloring of paints and paints should have sufficient durability, such as light fastness and weather fastness, and should also have high hiding power or specific transparency. It should be dispersed in oily or water-based paints. The medium has ideal solvent resistance stability, color and light stability, and no obvious flocculation phenomenon occurs during storage and use. The organic pigments used in the coloring of rubber and resin-based plastics should be easily and uniformly dispersed in the material to be colored, and have good compatibility with resins. The pigments for rubber coloring should also be resistant to vulcanization, especially To have satisfactory thermal stability, the color and light will not change at the temperature of the molding process. When the plastic is colored, the pigment should also have good solvent resistance, migration resistance, and good stability to the commonly used plasticizers. The three basic colors (yellow, magenta, cyan) used in printing inks have specific spectral characteristics, good vividness, and satisfactory transparency, especially in the widely used four-color overprinting process, respectively When overprinting in black, cyan, magenta and yellow, yellow pigments with excellent transparency should be used. In addition, in order to ensure the quality of printing ink, good dispersion performance is also very important. The ink used for printing iron should also withstand the temperature above 160~170℃ without changing the color and light.

01/06/2019

Several factors affecting pigment dispersion

In addition to the rational use of dispersants, the dispersion of pigments, pH, cationic electrolyte and dispersion time, strength, humidity, etc. also have a great influence on the dispersion of pigments. A. The influence of dispersant on pigment dispersibility: For some pigment particles, it is difficult to use a single dispersant to meet the dispersion requirements. If two dispersants are used in combination, the dispersion effect will be significantly improved, and the amount of dispersant has not increased. This situation is common in the dispersion of pigments, not only can improve the dispersion effect, but also increase the stability. However, it should be noted that when mixing pigments dispersed by different dispersants, care must be taken to avoid flocculation and sudden increase in viscosity. B. The influence of PH value on pigment dispersion: The pH value is also an important factor affecting pigment dispersion. When the pigment is dispersed, there is a suitable PH value range. Beyond this range, the rheology of the pigment will change, and the viscosity will change. increase. C. The influence of cationic electrolyte on pigment dispersibility: The influence of electrolyte on pigment dispersibility is mainly realized by changing the electric double layer structure of pigment particles. It can weaken the counter ion layer and move it to the particle surface, causing the particles to interact with each other. Close; it can also compress the electronic layer, reduce the potential surface charge, and cause the flocculation of pigment particles. D. The influence of time, stirring intensity and humidity on the dispersibility of pigments: Dispersion time and stirring intensity are also an important factor affecting the dispersion effect of pigments, mainly by supplementing energy, changing the surface energy of the pigment particles and making them fully wetted. Dispersion effect. Generally speaking, with the increase of speed and the passage of time, the particles become finer and the dispersion effect is better (the coarse particles are reduced), but at the same time it may increase the bubbles and increase the energy consumption, so it should be considered. It depends on the dispersion effect.

01/06/2019

The properties of organic pigments

Organic pigments are colored organic substances. To make colored substances a pigment, it must have the following properties. 1. The color is bright, which can give a firm color to the object to be colored. 2. Insoluble in water, organic solvents or application media. 3. It is easy to be uniformly dispersed in the application medium, and is not affected by the physical and chemical effects of the application medium during the entire dispersion process, and retains their own inherent crystal structure. 4. Light resistance, weather resistance, heat resistance, acid and alkali resistance, and organic solvent resistance.

01/03/2019

In the new year, meet new horizons!

In 2018, Yuhong Chemical has been walking on the journey of vision of "focusing on colors and performing wonderfully" While moving forward, do not forget to record the good harvest in 2018 REACH Registration of Permanent Red, Permanent Yellow G, Permanent Yellow 2GS, Phthalocyanine Blue BGS, Phthalocyanine Green Continuous breakthroughs in overseas markets Leaving a memory, but also leaving a mark of the contract with the customer 2019 has come, the new year Work with you for a win-win situation and look at a broader horizon

11/28/2018

Introduction and main uses of pigments

There are many kinds of pigments, which are tiny colored substances. They are a kind of pigments made of organic compounds. They are painted on the surface of an object to form a colored layer, which can show a certain color. Generally divided into organic organic pigments and inorganic pigments. The difference between the two is that organic pigments have high tinting power, and the particles are relatively easy to disperse and are not easy to precipitate. They are generally used for coloring inks, coatings, plastic products, building materials and other materials. . So what is the difference between pigments and dyes? Many people can't tell. The following is a detailed introduction by professional manufacturer Yuhong Chemical. Pigment is an indispensable raw material in the coating manufacturing process. It can make the coating have a certain hiding power, increase color and protection, thereby making up for the defects of the paint. Not only that, it is quite expected to be in the coating, but it can also enhance it. The strength of the coating film itself prevents the penetration of ultraviolet rays, so the pigment also promotes the anti-aging effect of the coating. A variety of different pigments have a variety of different uses. In the paint industry, coloring pigments not only give the paint film the required color and hiding properties, but also enhance the paint film's durability, weather resistance, abrasion resistance and other properties. Anti-rust pigments are mainly used to prevent metal from rusting. In the atmosphere, especially in humid environments or other corrosive gas conditions, steel is easily rusted and corroded. In severe cases, it will cause structural damage or even use it. In order to prevent metal from rusting, there are many methods, such as pottery, electroplating, etc., among which the use of paint is a relatively simple and common method. Commonly used pigments with better anti-rust properties include: red lead, iron red, zinc yellow, barium metaborate, silver calcium yellow and so on. The above is the introduction and main uses of pigments. You can also choose pigments with different properties according to different objects of use. In fact, pigments are used in many industries, such as plastic industry, printing industry, paper industry, synthetic fiber industry, etc., from above. It can be seen that the use of chrome yellow pigment is quite extensive.