Composition of Chlorinated Rubber Coating

Chlorinated rubber coating is made out of chlorinated rubber resin, modified resin, pigments/fillers, additives, and solvents.

Ⅰ. Chlorinated rubber resin

1. Resin

The typical chlorine level of industrial chlorinated rubber products is 62 percent to 67 percent. Before painting, chlorinated rubber must be dissolved in a resin solution with a solvent. It may be dissolved in aromatic hydrocarbons, esters, ketones (excluding acetone), ethers, and chlorinated hydrocarbon solvents, but not in aliphatic hydrocarbons, alcohols, or water. For paint manufacturing, the chlorinated rubber resin is usually dissolved in xylene to a 40% solution.

2. Resins that have been modified

To increase the performance of the paint layer, such as gloss and light stability, mechanical qualities, and workability, chlorinated rubber coating is frequently mixed with certain natural or synthetic resins. Medium and long oil alkyd resins, polyurethane resins, acrylic resins, epoxy resins, phenolic resins, rosin, glycerin, rosin esters, and other resins can be utilized with chlorinated rubber resins. They react with cellulose acetate, ethyl cellulose, nitrocellulose, and vinyl acetate copolymers and are incompatible with them.

The kind and amount of modified resin used has a significant influence on the performance and cost of chlorinated rubber paint; in general, the amount of resin added is: modified resin: plasticizer = 1 to 3:1:0.5 chlorinated rubber

Ⅱ. Chlorinated rubber additives

1. Plasticizers

Because chlorinated rubber molecules include multiple six-membered rings, the coating film formed by itself is brittle, necessitating the addition of plasticizers for modification. Because chlorinated rubber is an inert resin, plasticizers must have an evident plasticizing action that is as similar as possible to the performance of chlorinated rubber (inert) in order to ensure the base material's stability.

2. An anti-settling agent is a substance that helps to keep things from settling

Paint should be mixed with the appropriate quantity of anti-sink agent, such as organic bentonite gum, fumed silica, hydrogenated castor oil, etc., to prevent and enhance chlorinated rubber paint pigment precipitation caking. Hydrogenated castor oil has a considerable thickening anti-sink effect. As a thixotropic additive, amide-modified hydrogenated castor oil was extensively utilized in the creation of thick paste type paint.

3. Additives not listed above

Because chlorinated rubber resin is ineffective at dispersing pigments and fillers, it is usually replaced by modified resin or chlorine paraffin. A tiny quantity of wetting and dispersing agents is occasionally used to increase the dispersion of the pigments in the paint, storage stability, and the surface condition of the paint layer.