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Polyester resin for building material, and preparation method thereof

A technology of polyester resin and building materials, applied in polyester coatings, coatings, powder coatings, etc., can solve the problems of reduced catalytic efficiency, prolonging reaction time, etc., to delay the aging process, prolong service life, excellent heat resistance and The effect of chemical resistance

Inactive Publication Date: 2012-12-12
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 building materials are saturated resins. In the current synthetic process of polyester resins, 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 the production time will be prolonged. Reaction time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of polyester resin:

[0045] The first stage:

[0046] 470.2 grams of neopentyl glycol, 3.5 grams of trimethylolpropane, 617.5 grams of terephthalic acid and 0.25 grams of esterification catalyst butylstannoic acid were added to the reactor and mixed;

[0047] Heating the reactor, when the temperature of the packed tower is higher than 101°C, start to pressurize the reactor to 7.3bar;

[0048] 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 6.5 hours), enter the second stage;

[0049] second stage:

[0050] 75.9 grams of isophthalic acid, 24.6 grams of adipic acid, and 0.4 grams of antioxidant pentaerythritol dioctadecyl phosphite were added to the reactor;

[0051] Heat the reactor to 25...

Embodiment 2

[0056] Preparation of polyester resin:

[0057] The first stage:

[0058] 470 grams of neopentyl glycol, 3.4 grams of trimethylolpropane, 560 grams of terephthalic acid and 0.25 grams of esterification catalyst butylstannoic acid are added to the reactor and mixed;

[0059] Heating the reactor, when the temperature of the packed tower is higher than 101°C, start to pressurize the reactor to 7.3bar;

[0060] 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 7 hours), enter the second stage;

[0061] second stage:

[0062] 87 grams of isophthalic acid, 15 grams of adipic acid, and 0.4 grams of antioxidant pentaerythritol dioctadecyl phosphite were added to the reactor;

[0063] Heat the reactor to 250°C, start the...

Embodiment 3

[0068] Preparation of polyester resin:

[0069] The first stage:

[0070] 422 grams of neopentyl glycol, 3.5 grams of trimethylolpropane, 617 grams of terephthalic acid and 0.25 grams of esterification catalyst butylstannoic acid are added to the reactor and mixed;

[0071] Heating the reactor, when the temperature of the packed tower is higher than 101°C, start to pressurize the reactor to 7.3bar;

[0072] 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 8.0-12.0mg KOH / g (esterification reaction time is 5.5 hours), enter the second stage;

[0073] second stage:

[0074] 75.7 grams of isophthalic acid, 24.5 grams of adipic acid, and 0.4 grams of antioxidant pentaerythritol dioctadecyl phosphite were added to the reactor;

[0075] Heat the reactor to 250°...

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Abstract

The invention discloses a polyester resin for a building material, which is prepared by esterification and polycondensation reactions of the following components in percentage by weight: 35-40% of neopentyl glycol, 0.1-1% of trimethylolpropane, 50-55% of terephthalic acid, 0.01-1% of esterification catalyst, 58% of isophthalic acid, 23% of adipic acid, 0.01-1% of antioxidant and 0.01-1% of resin additive, wherein the sum of the weight percentages of the components is 100 percent, the acid value of the polyester resin is 28.0-32.0mg KOH / g, the viscosity is 40.0-70.0PA.s by measurement at a temperature of 160 DEG C, the color is 0 to 12, 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 in the first stage of raw material adding instead of the second stage of raw material adding, so that the reaction speed is unexpectedly accelerated, and thus the production efficiency is obviously improved.

Description

technical field [0001] The invention relates to a polyester resin for building materials 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 building materials are saturated resins. In the current synthetic process of polyester resins, antioxidants and catalysts are generally a...

Claims

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Application Information

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IPC IPC(8): C08G63/78C08G63/20C09D167/02C09D5/03
Inventor 浦密荣曹银波
Owner 帝兴树脂(昆山)有限公司
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