Polyester resin for household appliances and preparation method thereof

A technology of polyester resin and household appliances, applied in polyester coatings, coatings, powder coatings, etc., can solve the problems of prolonged reaction time, decreased catalytic efficiency, etc., and achieves delaying aging process, prolonging service life, excellent and good leveling and mechanical properties

Active Publication Date: 2015-05-06

帝兴树脂(昆山)有限公司

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AI-Extracted Technical Summary

Problems solved by technology

[0004] Polyester resins for household appliances are saturated resins. In the current polyester resin synthesis process, antioxidants and catalysts are generally a...

Abstract

The invention discloses a polyester resin for household appliances, which is prepared by esterification and polycondensation reactions of the following components in percentage by weight: 29-31% of neopentyl glycol, 4-5% of ethylene glycol, 0.1-1% of trimethylolpropane, 52-58% of terephthalic acid, 0.05-1% of esterification catalyst, 5-7% of isophthalic acid, 1-3% of adipic acid, 0.2-1% of antioxidant and 0.01-1% of resin additive, wherein the acid value of the polyester resin is 28.0-32.0mg KOH/g, the viscosity is 30.0-60.0PA.s by measurement at a temperature of 160 DEG C, the color is 0 to 12.0, and the glass transition temperature is 60-62 DEG C. The invention also discloses a method for preparing the polyester resin. The antioxidant is added by moving from the first stage of raw materials to the second stage of raw materials, so that the chemical reaction speed is accelerated, and thus the production efficiency is obviously improved.

Application Domain

Powdery paintsPolyester coatings

Technology Topic

ChemistryAntioxidant +12

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Examples

Experimental program(3)

Example Embodiment

[0044] Example 1

[0045] Preparation of polyester resin:

[0046] The first stage:

[0047] 353 grams of neopentyl glycol, 3.5 grams of trimethylolpropane, 51 grams of ethylene glycol, 646 grams of terephthalic acid and 0.25 grams of esterification catalyst butylstannoic acid were added to the reactor and mixed;

[0048] Heating the reactor, when the temperature of the packed tower is higher than 101℃, start to pressurize the reactor to 7.3bar;

[0049] After heating the reactor to 250°C, start the depressurization program, and continue to heat the reactor to 260°C, reduce the pressure to 0 bar, and maintain the reactor at 260°C for esterification reaction. When the system is clear and the acid value reaches 10 After -14mg KOH/g (esterification reaction time is 6.0-8.0 hours), enter the second stage;

[0050] second stage:

[0051] 72 grams of isophthalic acid, 24.0 grams of adipic acid, and 0.4 grams of anti-oxidant pentaerythritol distearyl phosphite were added to the reactor;

[0052] Heating the reaction kettle to 250℃, further esterification reaction, and maintain at this temperature, when the system is clear, and the acid value reaches 40--48mg KOH/g (esterification reaction time is about 2.0 hours), enter the third stage ;

[0053] The third phase:

[0054] The reactor was evacuated to -0.9bar, and the water generated by the esterification reaction was further removed, so that the esterification reaction continued to proceed in the positive direction, when the acid value reached 28.0-32.0mg KOH/g, and the viscosity reached 30.0-60.0pa. After s, cool and pass nitrogen to break the vacuum;

[0055] When the system is cooled to 200°C, 0.6g of resin auxiliary curing accelerator and 10101.0g of antioxidant are added and mixed uniformly, and the reaction product is cooled into a solid sheet shape, which is crushed and packaged according to the weight requirements to obtain the household appliance. With polyester resin.

Example Embodiment

[0056] Example 2

[0057] Preparation of polyester resin:

[0058] The first stage:

[0059] 380 grams of neopentyl glycol, 36 grams of ethylene glycol, 640 grams of terephthalic acid and 0.25 grams of esterification catalyst butylstannoic acid were added to the reactor and mixed;

[0060] Heating the reactor, when the temperature of the packed tower is higher than 101℃, start to pressurize the reactor to 7.3bar;

[0061] After heating the reactor to 250°C, start the depressurization program, and at the same time continue to heat the reactor to 260°C, and maintain the reactor at this temperature to carry out the esterification reaction, when the system is clear and the acid value reaches 10--14mg KOH/g After (esterification reaction time is 6.5-8.5 hours), enter the second stage;

[0062] second stage:

[0063] Add 48 grams of isophthalic acid, 45 grams of adipic acid, and 0.4 grams of antioxidant pentaerythritol diphosphite to the reactor;

[0064] After heating the reaction kettle to 250°C and maintaining it at this temperature, when the system is clear and the acid value reaches 38--45mg KOH/g (esterification reaction time is about 2.0 hours), the third stage is entered;

[0065] The third phase:

[0066] The reactor was evacuated to -0.9bar, and the water generated by the esterification reaction was further removed, so that the esterification reaction continued to proceed in the positive direction, when the acid value reached 26.0-30.0mg KOH/g, and the viscosity reached 24.0-44.0pa. After s, cool and pass nitrogen to break the vacuum;

[0067] When the system is cooled to 200°C, add 2.0 g of resin auxiliary antioxidant 1010, and mix evenly, cool the reaction product into a solid flake shape, and pack it according to weight requirements after crushing to obtain the polyester resin for household appliances. .

Example Embodiment

[0068] Example 3

[0069] Preparation of polyester resin:

[0070] The first stage:

[0071] 342 grams of neopentyl glycol, 50 grams of ethylene glycol, 12 grams of trimethylolpropane, 630 grams of terephthalic acid, 10.5 grams of isophthalic acid and 0.25 grams of esterification catalyst butylstannoic acid were added to the reactor and mixed;

[0072] Heating the reactor, when the temperature of the packed tower is higher than 101℃, start to pressurize the reactor to 7.3bar;

[0073] After heating the reactor to 245°C, start the depressurization program, and continue to heat the reactor to 260°C. When the pressure drops to 0 bar, keep the reactor at this temperature to carry out the esterification reaction. When the system is clear and the acid value reaches After 10.0-14.0mg KOH/g (esterification reaction time is 6.5-8.0 hours), enter the second stage;

[0074] second stage:

[0075] 40.0 grams of isophthalic acid, 60 grams of adipic acid, and 0.4 grams of anti-oxidant pentaerythritol distearyl phosphite were added into the reactor;

[0076] Heat the reaction kettle to 250°C for further esterification and maintain at this temperature. When the system is clear and the acid value reaches 45--52mg KOH/g (esterification reaction time is about 2.5 hours), enter the third stage ;

[0077] The third phase:

[0078] The reactor was evacuated to -0.9bar, and the water generated by the esterification reaction was further removed, so that the esterification reaction continued to proceed in the positive direction, when the acid value reached 32.0-38.0mg KOH/g, and the viscosity reached 22.0-39.0pa. After s, cool and pass nitrogen to break the vacuum;

[0079] When the system was cooled to 200°C, 5.0 g of resin auxiliary curing accelerator was added and mixed evenly, and the reaction product was cooled into solid flakes, which were crushed and packaged according to weight requirements to obtain the polyester resin for household appliances.

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Polyester resin for household appliances and preparation method thereof

AI-Extracted Technical Summary

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Description & Claims & Application Information

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