WO2024082179A1 - Résine de polyester pour revêtement en poudre métallique, son procédé de préparation et son application - Google Patents

Résine de polyester pour revêtement en poudre métallique, son procédé de préparation et son application Download PDF

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Publication number
WO2024082179A1
WO2024082179A1 PCT/CN2022/126222 CN2022126222W WO2024082179A1 WO 2024082179 A1 WO2024082179 A1 WO 2024082179A1 CN 2022126222 W CN2022126222 W CN 2022126222W WO 2024082179 A1 WO2024082179 A1 WO 2024082179A1
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WO
WIPO (PCT)
Prior art keywords
metal powder
polyester resin
powder coating
mgkoh
transparent
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PCT/CN2022/126222
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English (en)
Chinese (zh)
Inventor
曾历
顾宇昕
李勇
马志平
陈观文
许奇俊
Original Assignee
擎天材料科技有限公司
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Priority to PCT/CN2022/126222 priority Critical patent/WO2024082179A1/fr
Priority to CN202280004573.4A priority patent/CN116096777A/zh
Publication of WO2024082179A1 publication Critical patent/WO2024082179A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/64—Polyesters containing both carboxylic ester groups and carbonate groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/78—Preparation processes
    • C08G63/81—Preparation processes using solvents
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers

Definitions

  • the invention belongs to the technical field of powder coatings, and in particular relates to a polyester resin for metal powder coatings and a preparation method and application thereof.
  • the present invention aims to solve at least one of the technical problems existing in the above-mentioned prior art.
  • the first aspect of the present invention provides a polyester resin for metal powder coating, and the bonding metal powder coating prepared by using the polyester has a prominent metal effect and a beautiful appearance.
  • the second aspect of the present invention provides a method for preparing the polyester resin for metal powder coating.
  • a third aspect of the present invention provides a metal powder coating comprising the polyester resin for metal powder coating.
  • a polyester resin for metal powder coating is provided.
  • the raw materials for preparing the polyester resin include: polyol, halogenated bisphenol A, terephthalic acid, phthalic anhydride, an acidolysis agent and tert-butyl glycidyl carbonate.
  • the polyester resin for metal powder coating is prepared from raw materials including, by mass fraction, 20wt% to 35wt% of polyol, 3wt% to 20wt% of halogenated bisphenol A, 30wt% to 55wt% of terephthalic acid, 2wt% to 10wt% of phthalic anhydride, 5wt% to 15wt% of acidolysis agent and 1wt% to 5wt% of tert-butyl glycidyl carbonate.
  • the halogenated bisphenol A has a structural formula of Formula I:
  • each R is independently selected from H and/or halogen, and at least one R is H and at least one R is halogen.
  • the halogenated bisphenol A comprises dihalogenated bisphenol A having the structural formula Ia:
  • R 1 is halogen
  • the halogenated bisphenol A has a structural formula of Formula Ib:
  • the amount of the halogenated bisphenol A is 5 wt% to 20 wt% by mass, preferably 5 wt% to 15 wt%.
  • the polyol includes at least one of neopentyl glycol, ethylene glycol, 2-methyl-1,3-propanediol, 2-ethyl-2-butyl-1,3-propanediol, 1,3-propanediol, 1,6-hexanediol, 1,4-cyclohexanediol or trimethylolpropane; preferably, it is a combination of neopentyl glycol and other polyols. Further preferably, the ratio of neopentyl glycol to other polyols is greater than 5:1; further preferably, the ratio of neopentyl glycol to other polyols is greater than 6:1.
  • the amount of the polyol is 25 wt% to 35 wt% by mass, preferably 28 wt% to 33 wt%.
  • the amount of terephthalic acid is 30 wt% to 50 wt% by mass; preferably 35 wt% to 50 wt%; and more preferably 35 wt% to 45 wt%.
  • the amount of the phthalic anhydride acid is 3 wt% to 10 wt% by mass; preferably 4 wt% to 10 wt%; and more preferably 5 wt% to 10 wt%.
  • the acidolysis agent includes at least one of isophthalic acid, succinic acid, adipic acid or 1,4-cyclohexanedicarboxylic acid; preferably, the amount of the acidolysis agent is 7wt% to 15wt% by mass; preferably 7wt% to 12wt%.
  • the amount of versatile glycidyl carbonate is 1.5 wt% to 5 wt% by mass; preferably 2 wt% to 5 wt%; and more preferably 3 wt% to 5 wt%.
  • the raw materials for preparing the polyester resin for metal powder coatings further include an esterification catalyst, a curing accelerator, and an antioxidant.
  • an esterification catalyst for preparing the polyester resin for metal powder coatings of the present invention
  • polyols, halogenated bisphenol A, terephthalic acid, phthalic anhydride, acidolysis agent, and tert-butyl glycidyl carbonate are components of the skeleton structure of the polyester resin, wherein tert-butyl glycidyl carbonate is used as a capping agent;
  • the esterification catalyst is used to adjust the esterification polycondensation reaction rate and reaction degree, and the curing accelerator and antioxidant are used to improve certain properties of the polyester resin, respectively.
  • the esterification catalyst includes at least one of monobutyltin oxide, dibutyltin oxide or stannous oxalate.
  • the amount of the esterification catalyst is 0.05% to 0.15% by mass of the total material.
  • the curing accelerator includes at least one of benzyltriethylammonium chloride, triphenylphosphine, phosphine bromide, triphenylphosphine or tert-butylamine; the amount of the curing accelerator is 0.01% to 0.1% by mass of the total material.
  • the antioxidant includes a primary antioxidant and a secondary antioxidant
  • the primary antioxidant includes antioxidant 1076 and/or antioxidant 1010
  • the secondary antioxidant includes antioxidant 168 and/or antioxidant 626.
  • the mass ratio of the primary antioxidant to the secondary antioxidant is 1:2 to 2:1, and more preferably 1:1.
  • the acid value of the polyester resin for metal powder coating is 30 mgKOH/g to 35 mgKOH/g
  • the melt viscosity at 200°C is 3500 mp.s to 9000 mp.s
  • the glass transition temperature Tg is 60°C to 70°C
  • the reactivity at 180°C is 120s to 360s.
  • the melt viscosity at 200°C of the polyester resin for metal powder coating is 4000 mp.s to 8000 mp.s
  • the glass transition temperature Tg is 62°C to 70°C
  • the reactivity at 180°C is 180s to 360s.
  • the melt viscosity at 200°C of the polyester resin for metal powder coating is 5000 mp.s to 7000 mp.s
  • the glass transition temperature Tg is 62°C to 68°C
  • the reactivity at 180°C is 240s to 330s.
  • a method for preparing a polyester resin for metal powder coating comprising the following steps:
  • the temperature of the esterification polycondensation reaction is 240°C to 245°C.
  • the temperature is lowered to 230°C to 236°C, phthalic anhydride is added to react until the material becomes clear and transparent; the temperature is further lowered to 228°C to 233°C, an acidolysis agent is added to react until the material becomes clear and transparent, and the acid value is controlled to be between 45 mgKOH/g and 52 mgKOH/g.
  • the temperature of the vacuum polycondensation reaction is 225°C to 230°C, and the vacuum degree is -0.085 MPa to -0.1 MPa; preferably -0.095 MPa.
  • the method for preparing the polyester resin for metal powder coating comprises the following steps:
  • a metal powder coating comprising the polyester resin for metal powder coating.
  • the polyester resin for metal powder coating of the present invention has enhanced polarity of polyester resin due to the introduction of halogenated bisphenol A with halogen side groups, and the enhancement of polarity is conducive to improving the surface tension of the resin.
  • the metal pigment can reduce the influence of gravity sedimentation under the pulling force of the resin surface tension, stabilize the metal pigment on the coating surface, and make the coating show better metal effect.
  • tert-butyl glycidyl carbonate is introduced into the main chain of the polyester resin as a capping agent.
  • the tert-carbon group suspended in the structure of tert-butyl glycidyl carbonate can increase the wettability of the metal pigment, so that the metal pigment is better coated in the resin, thereby reducing the risk of peeling after the metal pigment is bonded to the resin.
  • the preparation method of the polyester resin for metal powder coating of the present invention allows all raw materials to be fully polymerized into the main chain, bringing further optimized performance to the resin, which is reflected in: (a) the reaction activity of phthalic anhydride is significantly higher than that of terephthalic acid. Its addition in the second step can not only avoid the competitive polymerization with terephthalic acid resulting in incomplete reaction of terephthalic acid, but also ensure the complete reaction of halogenated bisphenol A; (b) tert-butyl glycidyl carbonate is a monofunctional group. Its addition in the early stage of synthesis will affect the polymerization degree of the main chain. At the same time, the larger side groups in its structure will significantly reduce the Tg of the polyester.
  • the present invention utilizes the high reactivity of the epoxy group in tert-butyl glycidyl carbonate, uses it as a capping agent and introduces it into the main chain by reacting with the carboxyl group at a relatively low temperature, which will not affect the polymerization degree of the main chain. At the same time, placing the tertiary carbon group at the end of the main chain has a limited effect on the Tg of the polyester.
  • FIG. 1 shows the distribution of silver powder in a metal powder coating of a polyester resin in Example 1 of the present invention.
  • FIG. 2 shows the distribution of silver powder in the metal powder coating of the polyester resin in Comparative Example 1 of the present invention.
  • FIG. 3 shows the distribution of silver powder in the metal powder coating of the polyester resin in Comparative Example 2 of the present invention.
  • This comparative example prepares a polyester resin, which is different from Example 5 in that tert-butyl glycidyl carbonate is adjusted to the first step of feeding, and the specific process is as follows:
  • This comparative example prepared a polyester resin, and the specific process was as follows:
  • the polyol and the esterification catalyst are heated under the protection of inert gas until they are melted, and then terephthalic acid is added, and the temperature is gradually increased to the insulation temperature to carry out esterification polycondensation reaction until the material is clear and transparent;
  • polyester resins obtained in Examples 1 to 5 and Comparative Examples 1 to 2 were tested for performance, wherein:
  • Reactivity refers to the time required for the resin and curing agent to react into gel, and is measured at 180°C according to GB/T 16995-1997.
  • polyester resins prepared according to the methods of Examples 1-5 and Comparative Examples 1-2 are respectively used to prepare metal powder coatings.
  • the preparation of metal powder coatings can be divided into two stages according to the process flow: powder coating base powder preparation and bonding processing: 1) Preparation of powder coating base powder: weigh each component according to the base powder formula in Table 3, and obtain the required powder coating base powder after premixing, melt extrusion, cooling and tableting, crushing and pulverizing and sieving; 2) Bonding processing: put powder base powder, silver powder and bonding aid into a bonding pot according to the metal powder coating formula in Table 3, stir and heat at high speed, and bond. After bonding, quickly put the material into a cold mixing pot for low-speed stirring and cooling, and obtain metal powder coating after sieving. The bonded metal powder coating is electrostatically sprayed on a pre-treated cold-rolled steel plate, cured at 200°C for 10 minutes to obtain a coating sample, and its coating performance and metal effect are tested. The test results are shown in Table 4 below.
  • the effect of metal powder is mainly to meet the apparent metal effect, and the judgment method is basically a visual method, which is also a commonly used method in the industry. Leveling mainly observes the flatness of the coating to see if there are orange peel and other phenomena. It is generally compared with the standard board of PCI, and 1-9 indicates that the flatness is from poor to good.
  • the uniformity of metal powder mainly depends on whether the metal powder is evenly distributed on the surface of the sample. Some areas have too much metal powder and some areas have less, which is called flower in the industry. As a metal powder, if the bonding effect is not good, the free metal pigment will be easily adsorbed around the sample due to electrostatic adsorption, so that the four sides are shiny, which is what the industry calls the frame effect.
  • Example 1 If the metal pigment settles during the curing process, it will directly affect the metal effect of the coating. Only when the metal pigment floats on the surface of the coating can a coating with a metal effect be obtained. The distribution of the metal pigment on the surface of the coating can be observed microscopically by scanning electron microscopy.
  • the coating electron microscope scanning images of Example 1, Comparative Example 1 and Comparative Example 2 correspond to Figures 1, 2 and 3 respectively.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Paints Or Removers (AREA)

Abstract

La présente invention concerne une résine de polyester pour un revêtement en poudre métallique, son procédé de préparation et son application. La résine de polyester pour le revêtement en poudre métallique est préparée à partir des matières premières suivantes : polyol, bisphénol halogéné A, acide téréphtalique, anhydride phtalique, agent d'acidolyse et carbonate de glycidyle tertiaire. La résine de polyester pour le revêtement en poudre métallique de la présente invention, par introduction d'un bisphénol halogéné A avec un groupe latéral halogène, améliore la polarité de la résine de polyester, l'amélioration de polarité étant bénéfique pour augmenter la tension de surface de la résine. Dans le processus de durcissement à haute température du revêtement en poudre métallique, le pigment métallique peut, sous la force de traction de la tension de surface de la résine, réduire l'influence de la sédimentation par gravité, le pigment métallique étant ainsi stabilisé sur la surface du revêtement, de telle sorte que le revêtement présente un meilleur effet métallique.
PCT/CN2022/126222 2022-10-19 2022-10-19 Résine de polyester pour revêtement en poudre métallique, son procédé de préparation et son application WO2024082179A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/CN2022/126222 WO2024082179A1 (fr) 2022-10-19 2022-10-19 Résine de polyester pour revêtement en poudre métallique, son procédé de préparation et son application
CN202280004573.4A CN116096777A (zh) 2022-10-19 2022-10-19 一种金属粉末涂料用聚酯树脂及其制备方法和应用

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PCT/CN2022/126222 WO2024082179A1 (fr) 2022-10-19 2022-10-19 Résine de polyester pour revêtement en poudre métallique, son procédé de préparation et son application

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