Process of producing alkyd resin using waste oil

Abstract

The process of producing semi-finished paint self-dried alkyd resin with sewage ditch oil includes heating sewage ditch oil and monoacid in the pot to 70-90 deg.c and adding assistant, dewatering before heating to 140-160 deg.c slowly, adding maleic anhydride, heating to 240-260 deg.c in 1.5-3.0 hr to acidolyze sewage ditch oil, cooling to 180-200 deg.c and adding polyol, polybasic acid and reflux solvent, heating to and maintaining at 180-200 deg.c, heating to and maintaining at 240-250 deg.c to dewater, heating to 270-290 deg.c to polymerize to reach required acid number and viscosity, cooling and adding solvent to dilute, filtering at 100 deg.c and packing. The present invention is environment friendly.

Description

1. Technical field [0001] The invention relates to the technical field of fine chemicals, in particular to a production method of semi-finished alkyd resin for coatings. 2. Background technology [0002] In the prior art, the alkyd resin is formed by polymerizing vegetable oil or vegetable oleic acid with polyhydric alcohols and polyacids. Due to the high price of raw materials, the cost of the product remains high. http: / / www.asia-coating.cn / xwzx / ShowArticle.asp? Article ID=744 (update time: 2006-11-7) discloses a method to replace vegetable oils such as soybean oil, tung oil, and linseed oil with gutter oil and waste vegetable oil residues, and to replace solvents with waste water in the production process, and to produce PTA in chemical plants. Residues and waste glycerin instead of polyols to synthesize water-based alkyd resins; this method uses cheap waste oil and waste vegetable oil residues as raw materials, so that the production cost is significantly reduced, but b...

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Problems solved by technology

[0002] In the prior art, alkyd resin is formed by polymerizing vegetable oil or vegetable oleic acid with polyols and polyacids. Due to the high price of raw materials, the cost of the product remains high.

http: / / www.asia-coating.cn / xwzx / ShowArticle.asp? Article ID=744 (update time: 2006-11-7) discloses a method to replace vegetable oils such as soybean oil, tung oil, and linseed oil with gutter oil and waste vegetable oil residues, and to replace solvents with waste water in the production process, and to produce PTA in chemical plants. Residues and waste glycerin instead of polyols to synthesize water-based alkyd resins; this method uses cheap waste oil and waste vegetable oil residues as raw materials, so that the production cost is significantly reduced, but because of the unstable iodine value of waste oil, the synthetic water-based alkyd resin Alkyd resin products have poor hardness and dryness, poor gloss, poor weather resistance, and when stored for a long time, they are easy to layer or freeze and are not easy to store

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