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Saturated carboxyl polyester resin with low acid value for powder coating and synthetic method thereof

A carboxyl polyester resin, a synthesis method technology, applied in powder coatings, polyester coatings, coatings and other directions, can solve problems such as acute toxicity, human body damage, environmental pollution, etc., achieve simple synthesis process, low curing agent dosage, Environmentally friendly effects

Inactive Publication Date: 2009-10-21
杭州中法化学有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used curing agent for polyester resin used in powder coatings is triglycidyl isocyanurate (TGIC), which is highly toxic to the respiratory system and digestive system of the human body, has a stimulating effect on the eyes, and is harmful to the skin. It is slightly irritating to the nasal cavity, potentially damaging and carcinogenic to the human body, so excessive use of triglycidyl isocyanurate (TGIC) will affect human health and pollute the environment to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] In the presence of butyl stannoic acid catalyst, under the protection of nitrogen, in the polyester synthesis reactor, add the terephthalic acid of 45% of the amount of material and the amount of terephthalic acid of 41% of the amount of material, the isophthalic acid of the amount of 11% of the amount of material Diformic acid, the direct melt esterification polycondensation reaction of the adipic acid of 3% substance amount 12 hours, the temperature of esterification polycondensation reaction is 240 ℃, wherein, butyl stannoic acid accounts for 0.01% of above-mentioned reaction material gross weight, obtains low acid value saturated carboxyl polyester resin.

[0011] The low acid value saturated carboxyl polyester resin obtained in this example has an acid value of 25 mg KOH / g, a number average molecular weight of 5200, and a glass transition temperature of 60° C.

Embodiment 2

[0013] In the presence of butyl stannoic acid catalyst, under the protection of nitrogen, in polyester synthesis reactor, add the trimethylolpropane of 5% material amount, the neopentyl glycol of 40% material amount and the right amount of 39% material amount Phthalic acid, isophthalic acid in the amount of 16%, adipic acid in the amount of 3% in the direct melt esterification and polycondensation reaction for 16 hours, the temperature of the esterification and polycondensation reaction is 190 ° C, wherein butyl stannic acid accounts for 0.01% of the total weight of the above-mentioned reaction materials to obtain a saturated carboxyl polyester resin with a low acid value.

[0014] The low acid value saturated carboxyl polyester resin obtained in this example has an acid value of 20 mg KOH / g, a number average molecular weight of 7500, and a glass transition temperature of 70° C.

Embodiment 3

[0016] In the presence of butyl stannoic acid catalyst, under the protection of nitrogen, in the polyester synthesis reactor, add the trimethylolpropane of the amount of 2% substance, the neopentyl glycol of the amount of 46% of the substance and the right ratio of the amount of 40% of the substance Phthalic acid, isophthalic acid in the amount of 10%, adipic acid in the amount of 2% for direct melt esterification and polycondensation reaction for 15 hours, the temperature of the esterification and polycondensation reaction is 230°C, wherein butyl stannic acid accounts for 0.02% of the total weight of the above-mentioned reaction materials to obtain a saturated carboxyl polyester resin with a low acid value.

[0017] The low acid value saturated carboxyl polyester resin obtained in this example has an acid value of 22 mg KOH / g, a number average molecular weight of 6300, and a glass transition temperature of 66°C.

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Abstract

The invention discloses a saturated carboxyl polyester resin with low acid value. The acid value of the resin is 20 to 25 mg KOH / g, the number average molecular weight is 5,000 to 7,000, and the glass transition temperature is between 50 and 70 DEG C. In the presence of a butyl stannic acid catalyst and under the protection of nitrogen, polyatomic acid and polylol are subjected to direct melting, esterification and polycondensation reaction to synthesize the saturated carboxyl polyester resin. The synthetic process is simple; the saturated carboxyl polyester resin with low acid value is used to prepare powder coating, the using amount of a required curing agent is low, generally, and the ratio of the saturated carboxyl polyester resin with low acid value to the curing agent is 95 to 5, so the saturated carboxyl polyester resin with low acid value and the synthetic method reduce the using amount of the curing agent and the cost, and is favorable for environmental protection. Simultaneously, the powder coating containing the saturated carboxyl polyester resin with low acid value can be dry-mixed with a powder coating prepared by polyester containing high acid value according to different ratios to obtain sub-optical powder coatings with different glosses.

Description

technical field [0001] The invention relates to a low acid value saturated carboxyl polyester resin for powder coatings and a synthesis method thereof. Background technique [0002] Powder coating is a solid coating composed of polyester resin, curing agent, pigment, filler and additives. Powder coating has the following advantages: (1) The system is solid, with unique advantages such as no solvent, no pollution, no VOC emissions, low cost and excellent environmental benefits; (2) After the coating film is cured, it has high hardness, mechanical properties, The weather resistance and chemical resistance are very good; (3) the spraying performance of the powder coating is excellent; (4) the storage performance of the powder coating is stable. [0003] At present, the commonly used curing agent for polyester resin used in powder coatings is triglycidyl isocyanurate (TGIC), which is highly toxic to the respiratory system and digestive system of the human body, has a stimulatin...

Claims

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Application Information

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IPC IPC(8): C08G63/12C08G63/78C08G63/183C08G63/20C09D5/03C09D167/00
Inventor 刘志超
Owner 杭州中法化学有限公司
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