Polyester resin for engineering machinery

Abstract

The object of the present invention is to provide polyester resin for engineering machinery, the polyester resin comprises polyhydric alcohol, aromatic polybasic acid, a branching agent, an acidolysisagent, an esterification catalyst, an antioxidant and a curing accelerator, the acidolysis agent comprises one or a mixture of at least two of isophthalic acid (IPA), adipic acid (ADA), 1,4-cyclohexanedicarboxylic acid (CHDA), fumaric acid (FCC), trimellitic anhydride (TMA), succinic acid (BA) and dodecanedioic acid (DDDA), more preferably comprises at least the IPA and the ADA; the polyester resin can be combined with curing agents (TGIC, hydroxyalkylamide or blocked isocyanate), curing accelerators, pigments, fillers, leveling agent, degassing agents and the like to prepare powder coatingsfor engineering machinery. Compared with conventional polyester resin, the polyester resin has excellent mechanical properties and flexibility, water boiling resistance, weather resistance, low temperature frost resistance, thick coating resistance and unchanged performance when the curing temperature is changed, and crack resistance under freezing impact and bending of iron plates and electrophoresis plates at-18 DEG C, and the polyester resin is very suitable for coating in the field of engineering machinery.

Description

technical field [0001] The invention relates to the field of polyester resins, in particular to a polyester resin for engineering machinery. Background technique [0002] With the growth of China's economy, its demand for construction machinery is higher. Statistics show that the construction machinery industry achieved operating income of 596.4 billion yuan in 2018, an increase of 10.4% over 2017. At present, most products of construction machinery at home and abroad are still sprayed with solvent-based coatings. The spraying process of solvent-based paint is cumbersome and will produce a large amount of volatile organic compounds (VOC), causing serious pollution to the environment. Powder coating does not contain organic volatile matter, can be recycled and reused, and will not pollute the environment. It is an eco-friendly coating encouraged by the government. With the rapid development of the construction machinery industry, powder coatings applied to construction mach...

AI Technical Summary

Problems solved by technology

Chinese patent CN103755934B discloses a preparation method of polyester resin for frost-free powder coatings, but this patent only provides a preparation method of frost-free type, which is not suitable for the field of engineering machinery

CN105254860B provides a kind of polyester resin for powder coating of structural parts of engineering machinery and its preparation method, but the resin provided by the preparation method does not have thick coating, low temperature freezing impact bending and coating suitable for electrophoretic plates, etc.

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