Chemistry, asked by masumahasan1234, 9 months ago

Write the short notes on
1/ Classification of paint .
2/ Principle of green chemistry .
3/ Ceramics .
4/ Purification of industrial waste .water ​

Answers

Answered by balasahebjagtap1970
0

Answer:

thanks for your video will resume after the following ad listing has ended on YouTube my channel name camera and lens and the toss and elected to you and your family and friends and family and friends and family and friends and family and friends and family and friends and family and friends and family and friends and family and friends and family and friends and family and friends with anyone anymore thanks for your time in the toss to you soon and I give you a good time to you and r you brainlist and family welfare govt of you to know about the attached document by hi good

Answered by AnjaliSharma27012009
1

Answer:

Classification of paints by physical type

Solvent-borne paints contain up to 80% of solid constituents (binders, pigments and additives) dispersed in the organic solvent. Solvent-borne paints dry fast and may contain a wide range of binders. The main disadvantages of the solvent-borne paints are their toxicity and combustibility.

Water-borne paints contain water as the paint solvent. Waterborne paints are non-toxic and non-combustible but they are characterized by long drying time due to slow evaporation rate of water.

Water-borne paints based on water-soluble binders contain low molecular weight polymeric binders dispersed in water in form of true solutions. Water-soluble binders contain up to 15% of organic oxygen containing solvents soluble in water (alcohols, glycol ethers, etc.).

Water-borne paints based on polymer dispersions (Emulsion paints) contain 50-60% of high molecular weight polymeric binders dispersed in water in form of Colloids. Emulsion paint contain up to 5% of organic oxygen containing solvents soluble in water (alcohols, glycol ethers, etc.).

High-solids paints (Low VOC paints) contain more than 80% of solid constituents (binders, pigments) dispersed in an organic solvent. VOC - volatile organic compounds.

Powder coatings are obtained from powdered resin, particles of which are attracted by the electrostatic force to the substrate surface (electrodeposition). No solvent is involved in the process therefore powder coatings produce no/low toxic waste. The main disadvantage of powder coatings is high cost of equipment.

Radiation curable coatings are formed from a mixture of prepolymers, monomers and additives, which is cured under ultra-violet radiation. Radiation curable coatings harden fast and contain no solvents. The main disadvantage is relatively high cost.

to top

Classification of painting products by their functions

Paint - colored non-transparent protective coating.

Varnish - transparent or semi-transparent protective coating. A varnish is made of binder, solvent and additives. Some varnishes contain small amounts of pigment.

Enamel - hard protective coating with glossy finish.

Primer - the first coating applied to the surface in order to enhance the adhesion of the final paint (topcoat) and to seal the substrate surface. Primer may be formulated to impart additional protection to the substrate (eg. anti-rust primer for steel substrates).

Similar questions