Highlight polyester resin for coil steel household appliance finish paint as well as preparation method and application thereof

A technology for polyester resin and home appliances, which is applied in the field of high-gloss polyester resin and its preparation for the topcoat of coil steel appliances, to achieve the effects of reducing the occurrence probability of particles and particle lines on the board surface, excellent chemical resistance, and improving whiteness and brightness.

Inactive Publication Date: 2020-04-14
NIPPON PAINT GUANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first object of the present invention is to provide a high-gloss polyester resin for coiled steel appliances, which polyester resin is suitable for the topcoat of coiled steel appliances, and the obtained topcoat has excellent MEK resistance, chemical resistance, and At the same time, it c

Method used

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  • Highlight polyester resin for coil steel household appliance finish paint as well as preparation method and application thereof
  • Highlight polyester resin for coil steel household appliance finish paint as well as preparation method and application thereof
  • Highlight polyester resin for coil steel household appliance finish paint as well as preparation method and application thereof

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preparation example Construction

[0070] Another specific embodiment of the present invention provides a method for preparing the high-gloss polyester resin for coiled steel household appliances as described above, comprising the following steps:

[0071] Mix the organotin catalyst, diol mixture and part of the dibasic acid mixture in the reactor to react to obtain the prepolymer;

[0072] Continue to add the remaining dibasic acid mixture, tribasic acid or tribasic alcohol into the reaction kettle, gradually raise the temperature to 220-240°C, react until the reactant is clear and transparent, reflux until the acid value is 0-5mg KOH / g, the hydroxyl value 60-80 mg KOH / g; lower the temperature, add a solvent to dilute until the Gardner viscosity is Z-Z4 at 25°C, and obtain the high-gloss polyester resin for coiled steel appliances.

[0073] Yet another specific embodiment of the present invention provides a top coat for steel coil appliances, wherein the raw materials of the top paint for coil steel home appli...

Embodiment 1

[0111] Saturated polyester resin A1, the preparation method comprises the following steps:

[0112] The first stage:

[0113] Neopentyl glycol: 319 g, 2-methyl-1,3-propanediol: 146 g, terephthalic acid: 240 g, and catalyst: 1.3 g were put into the reactor. Under the condition of blowing nitrogen, slowly heat to 215°C to react to form a prepolymer, react until the acid value is less than 1mgKOH / g and the prepolymer is clear and transparent at 215°C, then cool to 160°C.

[0114] second stage:

[0115] At 160°C, put isophthalic acid: 348g, adipic acid: 160g, trimellitic anhydride: 49g into the reactor, continue heating to 238-240°C, and control the reaction time within 10 hours until the polyester resin It is clear and transparent at the reaction temperature, and then slowly add about 28g of xylene for reflux until the reaction reaches an acid value of less than 5mg KOH / g, and the water output is about 160-170g. At this time, the temperature was lowered to 80° C., and 572 g of...

Embodiment 2

[0117] Saturated polyester resin A2, preparation method comprises the following steps:

[0118] The first stage:

[0119] Neopentyl glycol: 425 g, 2-methyl-1,3-propanediol: 110 g, and terephthalic acid: 134 g were put into the reaction kettle. Catalyst: 0.95 g. Under the condition of blowing nitrogen, slowly heat to 215°C to react to form a prepolymer, react until the acid value is less than 1mgKOH / g and the prepolymer is clear and transparent at 215°C, then cool to 160°C.

[0120] second stage:

[0121] At 160°C, put isophthalic acid: 303g, adipic acid: 254g, trimellitic anhydride: 43g into the reactor, continue heating to 238-240°C, and control the reaction time within 10 hours until the polyester resin It is clear and transparent at the reaction temperature, and then slowly add about 28g of xylene for reflux until the reaction reaches an acid value of less than 5mg KOH / g, and the water output is about 160-170g. At this time, the temperature was lowered to 80° C., and 70...

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Abstract

The invention discloses a highlight polyester resin for coiled steel household appliances. The polyester resin is prepared by the following steps: carrying out polymerization reaction among a dibasicalcohol mixture, a dibasic acid mixture and tribasic acid or tribasic alcohol under the action of an organic tin catalyst, and diluting the reaction product by a solvent. The acid value of the polyester resin is 0-5 mg KOH/g, the hydroxyl value of the polyester resin is 60-80 mg KOH/g, the solid content of the polyester resin is 55-65 wt%, and the Gardner viscosity of the polyester resin at 25 DEGC is Z-Z4. The polyester resin effectively improves the MEK resistance of a coating containing the polyester resin and the particle/particle beam problem of a coated plate. The invention also discloses a preparation method and application of the polyester resin.

Description

technical field [0001] The invention relates to the technical field of coil coating. More specifically, it relates to a high-gloss polyester resin for the top coat of coiled steel appliances and its preparation method and application. Background technique [0002] The application of color-coated sheets in the home appliance industry began in the 1980s. Although it has been developed for only a few decades, the consumption has been increasing year by year, and the global production capacity has exceeded 2 million t / a. Color plates for home appliances are widely used, mainly for electrical appliances, including panels, side panels and back panels of commercial and household appliances, as well as compartment panels that require high processability, and general decorative panels. Although my country's home appliance color board started late, it has developed rapidly. According to statistics, domestic home appliance color-coated panels have reached 800,000 t / a. [0003] At pr...

Claims

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Application Information

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IPC IPC(8): C08G63/20C08G63/78C09D167/02C09D161/20C09D161/28C09D101/14C09D5/16C09D7/62
CPCC08G63/20C08G63/78C08K2003/0806C08K2003/0812C08K2003/2241C08L2205/03C09D5/1662C09D5/1687C09D167/02C08L61/20C08K13/06C08K9/10C08K3/08C08K3/22C08L61/28C08L1/14
Inventor 林宏张雯静施珠容李伟喻晓春宫原贵宏张伟东
Owner NIPPON PAINT GUANGZHOU
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