Phthalic anhydride applications What activities are performed? Phthalic anhydride is currently made using naphthalene or orthoxylene catalyst. This substance is in the category of acids and according to chemical experts, this substance is a kind of carboxylic aromatic. This substance in our country is often known as “phthalic anhydride”.
This material is available in two forms, in some cases in the form of a clear and colorless liquid, and sometimes it is seen as a white layered powder that has a nasty odor that can be detected in this way. It is known as a colorless solid toxic substance that is soluble in disulfide and alcohol.
This material was first produced in Germany by the oxidation method of naphthalene, which was in the liquid phase with a mercury catalyst and was not of good quality.
Applications of phthalic anhydride
What is the most important part of phthalic anhydride applications?
Plasticizers:
An example of a phthalic anhydride application is its use in the synthesis of plasticizers. These materials are available organically, non-volatile, and usually in liquid form. When combined with elastomers or plastics, they enhance the expansion and flexibility of polymers.
Plasticizers are commonly used as one of the most widely used materials as additives in the plastics industry. One of the reasons for the popularity of this material is its cheapness. Plasticizers are commonly used in the manufacture of PVCs. Due to this feature, it is used to produce a large number of products.
Alkyd resins:
Other phthalic anhydride applications include the synthesis of alkyd resins, which are one of the cheapest and most common synthetic resins. Features alkyd paints high resistance to rain and sunlight. Acidic environments are weak.
These paints are not very sensitive to surface cleanliness when used and easily stick to different surfaces. Another feature of alkyd resins is their excellent resistance to corrosive environments. Spraying dilute acids and low sulfuric acid vapors have little effect on paint quality.
But in situations where the concentration of acids increases, these dyes will not have much resistance. Alkyd paints are not used at all in spaces that are close to organic and alkaline materials, oxidizing materials. This substance is usually obtained from the reactions of anhydrides or multifactorial acids, which are: maleic anhydride, isophthalic, phthalic anhydride with materials such as pentaerythritol or glycerol.
The most important applications of alkyd resins are its use in traffic and rubber paints, various industries, architectural and commercial applications, and architecture.
Alkyd resins
Unsaturated polyester resins:
Another case of phthalic anhydride applications is in unsaturated polyester resins. These resins are heat-resistant resins. Under suitable conditions, these types of resins can be converted from liquid to solid.
Polyester resins are known as the most widely used type of resins in the world. The main chain in these resins is in the form of ester junctions resulting from the reaction of an anhydrous or polyacetic compound with a polyalcoholic compound.
Another example of phthalic anhydride applications is its use in medicine. In this industry, phthalic anhydride is used in combination with cellulose acetate to deliver cellulose acetate phthalate (CAP) to the body. This substance is considered an auxiliary material to cover the intestines.
Another feature of this material is that it has antiviral activity. Phthalic anhydride is commonly used as a CAP degradant.
Other applications of phthalic anhydride include increasing the resistance of coatings and materials to flames. This material is used in the paint industry and the production of pigments and coatings.
Another application of phthalic anhydride is in the production of yellow quinoline dye. This dye is the result of the process of condensation of phthalic anhydride and methyl quinoline. This substance is very dangerous and with a very small contact can cause serious injuries and dangerous injuries, so when using this substance, extreme care must be taken to prevent any accident.