Triglycidyl-isocyanurate-cured carboxyl-terminated saturated polyester resin for thermal transfer printing powder coating and synthesizing method of triglycidyl-isocyanurate-cured carboxyl-terminated saturated polyester resin

Abstract

The invention provides triglycidyl-isocyanurate-cured carboxyl-terminated saturated polyester resin for thermal transfer printing powder coating and a synthesizing method of the triglycidyl-isocyanurate-cured carboxyl-terminated saturated polyester resin. The triglycidyl-isocyanurate-cured carboxyl-terminated saturated polyester resin is prepared by 30-45wt% of polyol, 43-55wt% of aromatic polyacid, 0.01-3wt% of branching agent, 8-18wt% of acidolysis agent, 0.03-0.15wt% of esterification catalyst, 0.01-2wt% of antioxidant and 0.01-1wt% of curing accelerator through melt polycondensation. The triglycidyl-isocyanurate-cured carboxyl-terminated saturated polyester is appropriate in glass-transition temperature and storage stability, simple in synthesizing process, low in cost and the like. The components of the triglycidyl-isocyanurate-cured carboxyl-terminated saturated polyester resin satisfy the requirements on polyester resin for powder coating in GB / T 5237.4-2008 Wrought Aluminum Alloy Extruded Profiles for Architecture-Part 4: Powder Coating Profiles, and the resin is applicable to the field of thermal transfer printing powder coating.

Description

Technical field [0001] The invention relates to the field of powder coatings, in particular to a carboxyl-terminated saturated polyester resin for triglycidyl isocyanurate curing thermal transfer powder coatings and a synthesis method thereof. Background technique [0002] At present, one of the large number of application fields of powder coatings is aluminum profiles. The latest national standard "GB / T 5237.4-2008 Aluminum Alloy Building Profiles Part 4: Powder Coating Profiles" puts forward a lot of requirements for polyester resins for powder coatings. The details are as follows: 1. Synthetic polyester polyols are usually neopentyl glycol, and other polyols that do not contain ß hydrogen can also be used. Pay attention to the purity of the polyols. Neopentyl glycol should be produced by hydrogenation. Ethylene glycol, diethylene glycol, and propylene glycol are not allowed; to improve resin intermediate phthalic acid (or other dibasic acids with better weather resistance than...

AI Technical Summary

Problems solved by technology

Therefore, these types of polyester resins cannot meet the new national standards, and will eventually be eliminated by the aluminum profile market.

[0004] CN107619472A discloses a method for preparing a resin for thermal transfer powder coatings. The use of PET components in the raw materials results in a large amount of beta hydrogen in the system, which leads to insufficient weather resistance and cannot meet the requirements of "GB / T 5237.4-2008 Aluminum Alloy Building Profiles Part 4: Requirements for Duster Profiles

CN105367765B discloses a method for preparing a resin for super-tough thermal transfer powder coatings. It adds a large amount of 2-methyl-1,3 propanediol to the formula to increase the toughness of the system, so the overall weather resistance is low

According to the actual feedback, the final sample coating has poor leveling and low weather resistance, which cannot meet the requirements of "GB / T 5237.4-2008 Aluminum alloy building profiles-Part 4: Dust-sprayed profiles"

CN102977346B discloses a polyester resin for curing weather-resistant powder coatings by TGIC. However, the acid value of the final polyester resin is 32-36, and the low acid value makes the crosslinking degree of the final coating low, which is not conducive to thermal transfer printing.

At the same time, the content of isophthalic acid in the resin accounts for about 11% of the resin, and the weather resistance is low, which cannot meet the requirements in "GB / T5237.4-2008 Aluminum Alloy Building Profiles Part 4: Powder Spraying Profiles"

CN1023304790A discloses a polyester resin for thermal transfer powder coating of outdoor aluminum profiles. The description in this patent indicates that a large amount of ethyl butyl propylene glycol is used in the formula, and there is no isophthalic acid in the formula, which also cannot meet the latest standards. Requirements of "GB / T 5237.4-2008 Aluminum Alloy Building Profiles Part 4: Powder Coated Profiles"

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