All-polyester resin for HAA curable coil powder coating and preparation method thereof

A technology of powder coating and polyester resin, applied in the field of polyester resin, can solve the problems of decreased impact resistance, insufficient weather resistance and poor bending performance of the coating, and achieve the effect of good hardness
CN105218795AActive Publication Date: 2016-01-06GUANGZHOU KINTE IND
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
GUANGZHOU KINTE IND
Publication Date
2016-01-06

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Abstract

The invention discloses all-polyester resin for an HAA curable coil powder coating. The all-polyester resin is end-carboxyl saturated polyester resin, the average functionality is 1.85-1.95, the acid value is 68-74 mg KOH / g, the glass-transition temperature is 60-65 DEG C, the softening point is 102-108 DEG C, the 200 DEG C melt viscosity is 3000-6000 Pa.s, and the 180 DEG C reactivity is 60-100 s. The all-polyester resin is prepared from, by mass, 30-35% of dihydric alcohol, 52-63% of aromatic dibasic acid, 1.8-11.5% of aliphatic dibasic acid and 1.5-3.0% of polyhydric alcohol, wherein the monomer components are subjected to melt phase polycondensation to prepare the all-polyester resin. The invention further discloses a preparation method of the polyester resin. The polyester resin has high reaction activity and short curing time and is suitable for a fast curing system required by the coil coating, and the powder coating prepared from the polyester resin is excellent in overall performance and has good hardness, flexibility, weather resistance, chemical resistance, solvent resistance, corrosion resistance, adhesiveness, impact resistance and the like after being cured for 60 s at 280 DEG C.
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Description

technical field

[0001] The invention relates to a polyester resin, in particular to a pure polyester resin for HAA cured coil powder coating, and simultaneously the invention also relates to a preparation method of the polyester resin. Background technique

[0002] The coating of coil steel is a pre-coating method, which is different from the traditional "post-coating". Due to a series of advantages such as simplified production process, efficient construction, saving investment and operating costs, compliance with environmental protection regulations, and better performance than traditional methods, it is a development direction of the coatings industry in the future, whether in the field of paint or other types of coatings. As we all know, traditional liquid coil coatings were successfully developed and applied in the late 1950s and early 1960s. To date, almost all prepainted coil coatings have been painted using liquid coil coatings. However, because liquid coil coating...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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