In paint formulation, a binder (also known as the vehicle) is the component that forms a film to hold the pigment particles together and adhere them to the surface being painted. Titanium dioxide and Phthalocyanine are examples of pigments, which provide color and opacity. Silicones are polymers that can be used in paints, often as additives for properties like water repellency or flexibility, or as binders in specialized coatings, but Novolac (a type of phenolic resin) is a well-established binder, particularly used in durable coatings like primers, can coatings, and industrial finishes due to its excellent chemical resistance and hardness.
Which one of the following is used as a binder in paints ?
Asked in UPSC NDA 1 2019 · Topic: Polymer (Synthesis, properties, and applications of common thermosets (e.g., Phenol-formaldehyde, Epoxy resins))
More Chemistry questions
- Which is the stronger acid than phenol due to the presence of three same electron with drawing groups (i) O-Toluic Acid (ii) Benzoic acid (iii) Salicylic Acid (iv) Picric Acid
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- Which is the strongest acid?
- Which of the following statements about carboxylic acids is/are correct? 1. Simple aliphatic carboxylic acids are soluble in water. 2. Higher carboxylic acids are practically insoluble in water. 3. The acidity of a carboxylic acid depends on the number of carbon atoms present in the hydrocarbon chain. Select the correct answer using the code given below.
- Simple aliphatic carboxylic acids (e.g., formic acid, acetic acid) are soluble in water because the polar carboxyl group (-COOH) can form hydrogen bonds with water molecules. 2. As the hydrocarbon chain length increases in higher carboxylic acids, the nonpolar hydrophobic part dominates, making them practically insoluble in water. 3. The acidity of a carboxylic acid is related to the stability of its conjugate base (carboxylate ion). Alkyl groups are electron-donating, which destabilizes the negative charge on the carboxylate ion. Therefore, increasing the number of carbon atoms (length of the alkyl chain) generally decreases the acidity of aliphatic carboxylic acids. The hydrocarbon chain's size does influence acidity. 4. Assertion (A): Formic acid is a stronger acid than acetic acid. Reason (R): Formic acid is an organic acid.
- The correct order of increasing acidic strength of the following acids is - (1) $CCl_3‐ COOH > CF_3COOH > NO_2-CH_2COOH > NC-CH_2COOH$ (2) $CF_3COOH > CCl_3‐ COOH > NO_2-CH_2COOH > NC-CH_2‐ COOH$ (3) $NC-CH_2COOH > NO_2-CH_2‐ COOH > CF_3COOH > CCl_3COOH$ (4) $NO_2-CH_2COOH > CCl_3COOH > CF_3‐ COOH > NC-CH_2COOH$ (5) Question not attempted
- pKa value of Acetic Acid is
- The order of acidic strength of the following is : Phenol, Benzoic acid, p-Nitrophenol
