Hydroquinone

Core Application Areas

1. Polymer Industry: High-efficiency Polymerization Inhibitor

Inhibits the free radical polymerization of monomers (styrene, acrylic acid, vinyl acetate, etc.) and extends shelf life (addition amount 0.01%-0.1%);

Principle: Captures free radicals generated during the polymerization reaction (such as •OH, R•), terminating chain growth.

2. Photography and Imaging Technology

Black and white film developer: Reacts with silver ions (Ag⁺) to reduce exposed silver halide to metallic silver (core of the image), often used in combination with Metol (p-methylaminophenol);

Color film bleach: Participates in image stabilization processing.

3. Pharmaceuticals and Cosmetics

Skin whitening agent: Inhibits tyrosinase activity and reduces melanin production (2%-4% concentration used in spot-removing creams), but the EU (EC) restricts its use due to potential cytotoxicity, while China stipulates a concentration of ≤0.02% for leave-on cosmetics;

Topical medication: 5% ointment used to treat psoriasis, effective by inhibiting epidermal cell proliferation.

4. Dyes and Fine Chemicals

Intermediate for the synthesis of azo dyes (such as Direct Fast Blue) and anthraquinone dyes;

Preparation of antioxidants (such as Tertiary Butylhydroquinone, TBHQ) and rubber antioxidants;

Used as an electroplating brightener: Improves the uniformity and gloss of nickel and copper coatings.

5. Energy and Environmental Protection

Battery additive: Inhibits the corrosion of negative plates and hydrogen evolution in lead-acid batteries, extending service life;

Wastewater treatment: Reduces heavy metal ions in water (such as Cr⁶⁺→Cr³⁺), reducing toxicity.