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Introduction to Common Types of Polyurethane Coatings
Release time:
2022-04-28
(1) Polyurethane modified paint This coating is also known as urethane oil. First, the drying oil is transesterified with polyol, and then reacted with diisocyanate. Its drying is carried out in air through double bond oxidation, and this paint dries quickly. Due to the presence of amide groups, its abrasion resistance, alkali resistance and oil resistance are increased. It is suitable for indoor, wood and cement surface coating, but it has poor leveling, easy yellowing, and color paint is easy to powder. (2) Hydroxyl-cured polyurethane coating It is generally a two-component coating. Component A contains isocyanate groups, and component B generally contains hydroxyl groups. When used, components A and B are mixed and coated to allow the isocyanate groups to react with the hydroxyl groups.
(1) Polyurethane modified paint
This coating is also known as urethane oil. It is made by first transesterifying drying oil with polyol, and then reacting it with diisocyanate. It dries in air through double bond oxidation, and dries quickly. The presence of amide groups increases its abrasion resistance, alkali resistance, and oil resistance. It is suitable for indoor use and coating surfaces of wood and cement, but it has poor leveling, is prone to yellowing, and colored paints are prone to chalking.
(2) Hydroxyl-cured polyurethane coating
Generally a two-component coating, component A contains isocyanate groups, and component B generally contains hydroxyl groups. When used, components A and B are mixed and applied, allowing the isocyanate groups to react with the hydroxyl groups to form a polyurethane polymer. It can be divided into clear varnish, enamel, and primer. It is the most abundant type of polyurethane coating. It can be used to produce coatings ranging from soft to hard, with glossy films. Used on metals, cement, wood, rubber, leather, etc.
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