Knowledge about polyurea coating

Polyurea coatings have some unique advantages that set them apart from other types of protective coatings. They also have some limitations and special requirements in order to properly apply them. 

 1. What is Polyurea?

Polyurea is an elastomer substance derived from step-growth polymerization, which involves combining a synthetic resin and isocyanate reactive materials. Thus, the reaction of an isocyanate part with a resin blend component part through the step growth process of polymerization produces polyurea.

Various formulations of resins and isocyanates can provide the desired setting time, moisture resistance, pigmentation, flame retarding properties and other unique features.

A hybrid coating is polyurea blended in polyurethane in predetermined proportions. The hybrid coating provides certain physical properties of the pure polyurea at a lower cost.

2. How do Aliphatic Polyurea Differ from Aromatic Polyurea?

Polyureas derived from aromatic diisocyanates are distinguished by ultraviolet (UV) light sensitivity.

Sunlight exposure or artificial UV light can cause deterioration of the polyurea's physical properties and color changes such as darkening and chalking. Aromatic polyurea is a low cost alternative but is not appropriate as a top coat; it can be adequate for a base coat application.

Polyureas derived from aliphatic diisocyanates can resist color change due to sunlight exposure and maintain their physical properties even under UV exposure conditions. They are preferred for outdoor applications because they can improve aesthetics with a glossy appearance and can be used at lower film thicknesses of around 30 mills. However, they are expensive when compared to aromatic polyureas, due to the complicated processing involved.

Amber Zhang Ms.

Foreign trade 

Zhejiang Ruico Advanced Materials Co., Ltd. (Stock No.873233)

Add: No.188, Liangshan Road, Linghu Town, Nanxun District, Huzhou City, Zhejiang Province, China 313018

Phone: +86 (572) 2903236

Fax: +86 (572) 2905222

Wechat: 15534631339

Website: www.ruicoglobal.com 

Email: [email protected]