Carbon Black in Coatings

1、Overview of Carbon Black

Paint was formerly known as lacquer, because this material was made from vegetable oils and natural lacquers in the beginning. As a result of scientific and technological progress and the development of a variety of synthetic materials, after the Second World War, a variety of synthetic resins have been widely used in the manufacture of paints, so that the product structure, quality and variety of fundamental changes have taken place, and now use the paint to name can not be scientifically reflected in the nature and characteristics of the paint, and has been renamed “coating materials” or “paint”. Coating material” or “paint”. Paint is a material that can be coated on the surface of an object by a specific construction method, and then dried and cured to form a continuous film that protects, decorates, or serves other special functions on the object being coated.

Paint has the following aspects of function:

① protection of objects The so-called protection refers to the paint has water resistance, rust resistance, corrosion, oil resistance, chemical resistance and weather resistance.

②The so-called decoration refers to the paint to give objects with colour, gloss, pattern, art patterns or three-dimensional sense, that is, you can beautify the function of the object.

③to give objects with special features such as conductive, electrical insulation, electromagnetic wave shielding, ultraviolet shielding, solar energy absorption, luminescence, light-sensitive, temperature, magnetic, anti-fouling, insecticidal, waterproof, heat-resistant, vibration-resistant, scratch-resistant, anti-chipping, anti-condensation, non-slip and so on.

Coating varieties, there are many kinds of classification methods, in addition to classification according to the function and application areas, but also according to the resin or solvent varieties used in coatings classification, such as solvents can be divided into waterborne, non-waterborne and solvent-free three categories. Traditional low-solids solvent-based coatings, containing about 50% of the organic solvents, these organic solvents in the manufacturing phase of the coating and the construction phase into the atmosphere, polluting the environment and endangering human health, so energy-saving and low-polluting waterborne coatings, powder coatings, high-solids coatings and radiation-curing coatings and other so-called “green coatings” is the direction of future development. Therefore, the so-called “green coatings” such as energy-saving and low-pollution water-based coatings, powder coatings, high-solid coatings and radiation-curing coatings are the future development direction.

2、 Raw materials for coatings

Coatings usually consist of the following components.

Film formation of the main components (or film-forming substances), is to determine the main properties of the film (such as film gloss, hardness, flexibility, impact resistance, weather resistance, etc.) of the components. Usually used natural materials, such as grease, modified oil, natural resins, nitrocellulose rubber, asphalt, etc.; synthetic materials, such as phenolic resins, alkyd resins, acrylic resins, polyester resins, epoxy resins, polyurethane resins, vinyl chloride resins, silicone resins, fluorine resins and so on.

Film forming auxiliary components (or additives). Add a small amount of additives in the paint, you can make the paint dispersion effect, storage stability, construction performance and film quality has improved significantly, increasing the value of the paint. Such as drying agent and curing agent for coating drying and curing, etc., used to improve the performance of the coating film or to give the coating film with special properties of plasticizers, mildew agents, insecticides and antifouling agents, etc., used to improve the storage stability of coatings emulsifiers, dispersants, antisedimentation agents, anti-skinning agents, etc., used to improve the performance of the coating construction of the anti-fluid hanging agent, tackifier, etc., and to improve the decorative properties of the coating film and the protection of anti-colour floatation agent, Anti-moisture agent, anti-cratering agent, levelling agent and so on.

Pigments can make the coating film present various colours and have covering power, and can also enhance the mechanical properties of the coating film and other special functions and anti-corrosion, anti-marine organisms reproduction and so on. Commonly used all kinds of inorganic or organic pigments. Among them, black pigment commonly used carbon black, iron oxide black, graphite and aniline black.

Fillers can adjust certain properties of coatings, such as fluidity, viscosity, film gloss, coating mechanical properties, etc., but also reduce the cost of coatings.

Solvent: organic solvents, water, etc. will be dissolved or diluted into a liquid state of the coating and drying and curing process plays an important role, these solvents and water ultimately evaporated from the coating film no longer residual dry film, it is to help form the coating film components. The exception is powder coatings, which do not use solvents, but rather utilise air as a flow medium for application.

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