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A kind of preparation method of coil polyester resin and its application in powder coating
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A polyester resin and powder coating technology, applied in powder coatings, polyester coatings, coatings, etc., can solve the problem that it is difficult to meet the bending resistance requirements of coil coatings, and achieve excellent bending resistance and adhesion , good impact resistance, good leveling effect
Active Publication Date: 2016-06-08
ANHUI SHENJIAN NEW MATERIALS
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At present, ordinary polyester powder coatings are difficult to meet the bending resistance requirements of coil coatings.
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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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[0022] The first stage: Put the formula amount of alcohol into the reaction kettle, heat to 110°C, wait for the alcohol to completely melt, stir at a speed of 130r / min, then put the formula amount of acid and esterification catalyst, heat up to 180°C, / 30min heating rate to 245°C, maintain acid value 5mgKOH / g;
[0023] The second stage: cool down to 210°C, put in acid, raise the temperature to 235°C, and maintain the acid value at 44mgKOH / g;
[0024] The third stage: cooling down to 220°C and vacuuming, the vacuum degree is -0.09MPa, and the acid value is maintained at 31mgKOH / g.
[0027] The first stage: Put the formula amount of alcohol into the reaction kettle, heat to 125°C, wait for the alcohol to completely melt, stir at a speed of 150r / min, then put the formula amount of acid and esterification catalyst, heat up to 180°C, Raise the temperature to 250°C at a heating rate of / 30min, and maintain the acid value less than 9mgKOH / g;
[0028] The second stage: cool down to 220°C, put in acid, raise the temperature to 240°C, and maintain the acid value at 48mgKOH / g;
[0029] The third stage: cooling down to 230°C and vacuuming, the vacuum degree is 0.1MPa, and the acid value is maintained at 35mgKOH / g.
[0032] The first stage: Put the formula amount of alcohol into the reaction kettle, heat to 115°C, wait for the alcohol to completely melt, stir at a speed of 140r / min, then put the formula amount of acid and esterification catalyst, heat up to 180°C, / 30min heating rate to 248°C, maintaining an acid value of 7mgKOH / g;
[0033] The second stage: cool down to 215°C, put in acid, raise the temperature to 237°C, and maintain the acid value at 46mgKOH / g;
[0034] The third stage: cooling down to 225°C and vacuuming, the vacuum degree is -0.095MPa, and the acid value is maintained at 33mgKOH / g.
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Abstract
The invention discloses a preparation method of coiled material polyester resin. The preparation method comprises three stages, wherein, in a first stage, adding alcohol with formulated amount into a reaction kettle, heating to be at 110-125 DEG C until the alcohol is molten completely, stirring at the rotating speed of 130-150r / min, adding acid and esterification catalyst with formulated amounts, heating to be at 180 DEG C, heating to be at 245-250 DEG C at the heating speed of 5 DEG C / 30min; in a second stage, reducing the temperature to be at 210-220 DEG C, adding secondary acid, heating to be at 235-240 DEG C; and in a third stage, reducing the temperature to be at 220-230 DEG C and vacuumizing. The invention also discloses application of the coiled material polyester resin to powdercoating. The coiled material polyester resin has good leveling effect, high storage stability, good bending resistance and adhesive force, good impact resistance, and good leveling performance and weather resistance, and can be applied to the coiled material powdercoating.
Description
technical field [0001] The invention relates to a preparation method and application of building materials, in particular to a preparation method of coiled polyester resin and its application on powder coatings, belonging to the field of coatings industry. Background technique [0002] With the rapid development of powder coatings in recent years, more and more new powder coating applications have emerged, which put forward higher and more detailed requirements for the performance of powder coatings. Coil powder coatings are one of them. Due to its particularity, coil coatings have special requirements for coating properties, such as weather resistance, chemical corrosion resistance, boiling water resistance, hardness and bending resistance. Among them, bending resistance and good adhesion are very important properties. At present, ordinary polyester powder coatings are difficult to meet the requirements of bending resistance of coil coatings. Contents of the invention ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information
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