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Curing Stage And Time Of Unsaturated Polyester Resin

Jul 27, 2020

Unsaturated polyester resin is a kind of chemical raw material. It is often used to thicken and solidify the surface of objects. When used, it is like painting. Layers are stacked. The curing process releases organic waste gas. Today we use the curing stage of unsaturated polyester resin. And time to analyze.

Unsaturated polyester resin

The curing process of unsaturated polyester resin can be divided into three stages, namely:

  1. Gelation stage (A stage): Count from the addition of curing agent and accelerator until the unsaturated polyester resin condenses into a jelly shape and loses fluidity. In this knot, the unsaturated polyester resin can be melted and can be dissolved in some solvents (such as ethanol, acetone, etc.). This stage takes about several minutes to tens of minutes.

  2. Hardening stage (stage B): starting from the gel of the unsaturated polyester resin, until it becomes a stage with sufficient hardness and basically no stickiness. In this stage, the unsaturated polyester resin can swell but not dissolve when it comes into contact with certain solvents (such as ethanol, acetone, etc.), and it can soften when heated but cannot completely melt. This stage takes about tens of minutes to several hours.

  3, maturation stage (C stage): placed at room temperature, counting from the hardening, to reach the required hardness of the product, with stable physical and chemical properties available for use. In this stage, the unsaturated polyester resin neither dissolves nor melts. The post-curing we usually refer to refers to this stage. This knot is usually a very long process. It usually takes days or weeks or even longer.