Paint used for coiled metal material
A technology for metal coils and coatings, applied in the field of back paint, top coat, and primer for metal coils, it can solve the problems of heavy smoke, chemical resistance, water resistance, stain resistance, corrosion resistance and friction resistance, High energy consumption and other issues, to achieve excellent flexibility and hardness, excellent chemical resistance, and reduce energy consumption
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Example Embodiment
[0029] Examples 1-4 are the preparation methods of saturated polyester resin.
[0030] Examples 5-6 are preparation methods of epoxy-modified saturated polyester resin.
Example Embodiment
[0031] Example 1
[0032] Add 127 g of xylene into a four-necked flask equipped with a vertical condenser, a mechanical stirrer, a thermometer and a constant pressure dropping funnel. Add 370g styrene, 88.5g allyl alcohol, 10.3g di-tert-butyl peroxide premixed monomer into the constant pressure dropping funnel, heat the xylene to 135℃ under stirring, and add about 95g premixed monomer first After reacting until the reflux slows down, then start to add the premixed monomer dropwise. The addition takes 2-3 hours. Close the constant pressure dropping funnel. The maximum reaction temperature is 145°C. After the reaction is kept warm for 1 hour, take a sample for measurement. The monomer conversion rate reaches 98% or more, the temperature is reduced to no reflux, the oil-water separator is replaced, and 69.2g adipic acid is added, the temperature is raised to 180-200℃, the temperature is kept and the acid value is less than 8mgKOH / g, and the flow is removed under vacuum. Until there...
Example Embodiment
[0040] Example 2
[0041] 100g of xylene was put into a four-necked flask equipped with a vertical condenser, a mechanical stirrer, a thermometer and a constant pressure dropping funnel, 379g of styrene, 60.5g of allyl alcohol, 60.5g of hydroxyethyl acrylate, 10.5g The pre-mixed monomer of di-tert-butyl oxide is added to the constant pressure dropping funnel, the xylene is heated to 135°C under stirring, and about 100 g of the above-mentioned pre-mixed monomer is added first, and the reaction is until the reflux slows down, and the pre-mixing is started. The monomer is added dropwise in 2-3 hours. The constant pressure dropping funnel is closed. The maximum reaction temperature is 145°C. After the reaction is kept for 1 hour, the monomer conversion rate is over 98% measured by sampling, and the temperature is reduced to no reflux. Install the oil-water separator, add 50.8g adipic acid, heat up to 180~200℃, keep the temperature and esterify until the acid value is less than 8mgKOH...
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