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Aniline is a compound widely used in cosmetics and other businesses. The purpose of using it in cosmetic products is to give hair a permanent color. There are various types of chemical formulas for aniline that are produced when mixing different aniline derivatives with different reagents. Below are some of the common chemical formulas for aniline:
Monosubstituted anilines
Monosubstituted anilines are a variant of aniline where a single functional group is attached to the aniline ring. Such reactive groups include methyl groups, nitro groups, hydroxyl, and halogen groups. Each of such substituted anilines has different physical and chemical characteristics. These differences also impact their usage in different industries. For example, p-toluidine, a methyl-substituted chemical formula aniline, is widely used in the manufacture of numerous plastic products like polyurethane foams.
Disubstituted anilines
Disubstituted anilines are formed when two different substituents are together attached to the aniline ring. They form complex chemical compounds which are useful in advanced chemical syntheses. The specific applications of such chemicals often differ. They depend on the nature of the substituents attached on the aniline ring. For instance, o-Aminobenzoic acid is produced from anthranilic acid which is used in the production of sunscreen agents like PABA.
Heterocyclic anilines
Heterocyclic anilines are chemically created by incorporating a heterocyclic ring into aniline. This modification is primarily done to improve the solubility of anilines in organic solvents. It helps to increase the bioactivity of this compound. The heterocyclic compounds also contribute to the anticancer and biological activity of the resulting anilines and their derivatives. These are therefore useful for producing fine chemicals and biologically active compounds.
One of the most common uses of aniline in the cosmetic industry is hair dye. Aniline derivatives have good substantivity, meaning they can adhere to the hair cuticle. This property is useful for penetrating the hair shaft and depositing color. Further, aniline and its derivatives are used in the production of Amines. These are appetite suppressants and hunger-satisfying foods because they reduce the desire to eat.
Oxidation hair dye
Permanent or oxidative hair dyes use the aniline derivatives of p-phenylenediamine (PPD) and m-phenylenediamine (MPPD) as intermediates. These dyes are mixed with hydrogen peroxide. The hydrogen peroxide acts as an oxidizing agent that helps in the oxidation process of aniline to form p-quinone dye bases. Hair dye was then redox coupled to produce a variety of colorful hues. This oxidation process allows the dyes to better bond with the hair cortex and produce long-lasting color.
No ammonia hair dye
Aniline hair dye also has a no-ammonia formula. These hair colors penetrate the hair cuticle and bond with the hair cortex during color application by an oxidation process that is ammonia-free. They do this by utilizing other chemical compounds such as ethanolamine. Ethanolamine has a lower pungency and helps the hair dye mixture to better penetrate the hair cuticle. Though not as effective as ammonia-based products, they provide a safer and more comfortable coloring experience.
Temporary Hair Dyes
Temporary hair dyes use a different form of aniline derivatives. These dyes use pre-formed color bases and pH-sensitive azo-couplers. These are azobenzenes formed by coupling aniline with phenols. The color bases are encapsulated in micelles. The micelles release the color bases upon reduction in pH. Phenolic azo-couplers are then coupled with the released bases to form colored dye aggregates. These aggregates are too large to penetrate the hair cuticle. They only adhere to the surface of the hair and provide color.
p-Phenylenediamine (PPD)
PPD is a widely used intermediate in hair dying products. It is a colorant that makes hair obtain long-lasting hues in cosmology. It gives a reddish-brown color which can be adjusted to other colors by adding other components. PPD has good fixation and substantivity properties. This allows the dye to bond effectively to the hair shaft and minimize color wash-off during exposure to water and shampoos.
Harrison's disease
m-phenylenediamine is another aniline derivative used to improve color and durability properties. Like PPD, it creates a long-lasting color that is more resistant to fading due to washing or exposure to sunlight. m-phenylenediamine forms stable color pigments within the hair hence improving color retention.
Environmental Resistance
In modern formulations, synthetic dyes and colorants are preferred over aniline-based dyes because they are more environment-friendly. They leave fewer hazardous waste products which are dangerous to the environment than aniline waste. Synthetic dyes are also more cost-effective to produce than aniline. They offer comparable to better durability properties.
Certificate and standards
It is important and a must to get hair dyes with certificates and standards from recognized and quality organizations. These are usually dermatologically approved products that have passed different hypoallergenic tests on human use. Usually, quality hair dyes have certifications such as safety datasheets and REACH, RoHS, and ISO. These standards report on the product's compliance with ecological and toxicological legislation.
Colorfastness
It is also recommended to look for hair colors with good colorfastness properties. These are hair dyes that won't readily fade due to washing, sun exposure, or environmental factors such as air pollution. Scientific papers have colorfastness metrics such as the AATCC and ISO standards. Looking at these standards is an indicator of the product's colorfastness.
Method of application
The method of mixing and applying the hair dye is another factor to consider. Prefer professional-grade hair dyes with simple application. This means hair dyes that can easily be applied without needing much expertise. Products with shorter processing times and faster application are also preferable. They do not cause discomfort to end users.
Origin
Preferred products are those manufactured by recognized and quality organizations. This is because they have the recommended safety, quality, and efficacy metrics compared to less quality products. Are there outsource manufacturers or manufacturers from other regions? They may not have the necessary credentials or certifications to ensure safety for human use.
A1: Ammonia-based hair dyes open the hair cuticle to allow the dye to penetrate the hair cortex effectively. This makes the color last longer as it better bonds to the hair. Ammonia-free hair dyes use less aggressive alkaline agents to gently swell the cuticle and allow a more comfortable and less damaging experience. They are therefore suitable for people with delicate hair that is easily damaged or prone to allergic reactions.
A2: It is not recommended to use aniline-based hair dyes frequently. Aniline-based hair dyes penetrate the hair shaft and provide long-lasting colors. This means the hair cuticle won't swell further to allow new dyes to penetrate, thus preventing coloring.
A3: To ensure hair retains its color after dying, use color-protecting shampoos and conditioners, avoid heat styling, protect hair from sun and chlorine exposure, and minimize washing with lukewarm water instead of hot water.
A4: Naturally derived colorants from plants like henna, indigo, and walnut shells are some eco-friendly alternatives to aniline-based hair dyes. They are easier to biodegrade and do not result in hazardous chemicals to the environment.
