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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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 added in the first stage of esterification reaction. Due to the chemical reaction between the two, the catalytic efficiency will decrease and prolong reaction time

Method used

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  • Polyester resin for household appliances and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 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°C, 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, wait until the pressure drops to 0bar, and keep 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 antioxidant pentaerythritol dioctadecyl phosphite were added to the reactor;

[0...

Embodiment 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 are added to the reactor and mixed;

[0060] Heating the reactor, when the temperature of the packed tower is higher than 101°C, 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 for esterification reaction. When the system is clear and the acid value reaches 10--14mg KOH / g After (the esterification reaction time is 6.5-8.5 hours), enter the second stage;

[0062] second stage:

[0063] 48 grams of isophthalic acid, 45 grams of adipic acid, and 0.4 grams of antioxidant pentaerythritol dioctadecyl phosphite were added to the reactor;

[0064] After heating the reactor to 250°C...

Embodiment 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°C, 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 0bar, keep the reactor at this temperature for 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 antioxidant pentaerythritol dioctadecyl phosphi...

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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.

Description

technical field [0001] The invention relates to a polyester resin for household appliances and a preparation method of the polyester resin. Background technique [0002] Polyester resin is a kind of polymer compound synthesized by polyhydric alcohol and polybasic acid through esterification and polycondensation reaction, and can be divided into saturated polyester resin and unsaturated polyester resin. [0003] Polyester resins are mainly used in the coating industry to prepare two-component polyurethane paints that cure at room temperature with amino resins, polyester-type amino baking varnishes or with polyisocyanates. These polyester-based systems have better weather resistance and durability than alkyd systems. Gloss retention, high hardness and good adhesion, it belongs to the high-end baking paint system. [0004] Polyester resins for household appliances are saturated resins. In the current polyester resin synthesis process, antioxidants and catalysts are generally a...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08G63/20C08G63/85C08K5/524C09D167/02C09D7/12C09D5/03
Inventor 曹银波浦密荣
Owner 帝兴树脂(昆山)有限公司
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