Auxiliary for reducing VOC (Volatile Organic Compound) of coating of transfer coating and preparation method thereof
A technology for transferring coatings and additives, applied in coatings, polyester coatings, cellulose coatings, etc., can solve the problem of inability to reduce the VOC of transfer coatings, and reduce the VOC content of coatings, save resources, and be easy to coat. Effect
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Embodiment 1
[0033] In this embodiment, the cosolvent is selected as a mixture of ethanol, n-propyl acetate and propylene glycol methyl ether, the mixed acid is selected as a mixture of glutaric acid and succinic acid, the low-carbon alcohol is selected as methanol, and the catalyst is selected as SnCl 2 2H 2 O, cyclohexane is selected as the water-carrying agent;
[0034] Step 1: Preparation of mixed polyester: In a 100mL round bottom flask equipped with a thermometer, reflux condenser and water separator, add 6.6g of glutaric acid, 5.9g of succinic acid, 12.8g of methanol, and heat up to 50°C Stir to dissolve evenly, add 0.55g SnCl 2 2H 2 O, 20mL cyclohexane, carry out esterification reaction under reflux state. After the reaction is finished, cool down first, concentrate and remove cyclohexane and excess methanol with a rotary evaporator, distill under reduced pressure, collect fractions under a vacuum of 0.09 MPa and a temperature of 100 to 180°C to obtain a mixed polyester;
[003...
Embodiment 2
[0038] What cosolvent selects in this embodiment is the mixture of isopropanol, ethyl acetate, dimethylformamide, and what mixed acid selects is the mixture of adipic acid and malonic acid, and what low-carbon alcohol selects is ethanol, and catalyst selects SnCl 2 2H 2 O, cyclohexane is selected as the water-carrying agent;
[0039] Step 1: Preparation of mixed polyester: In a 100mL round bottom flask equipped with a thermometer, a reflux condenser and a water separator, add 7.5g of adipic acid, 5.0g of malonic acid, and 10.6g of ethanol, and heat up to 50°C Stir to dissolve evenly, add 1.5g SnCl 2 2H 2 O, 30mL cyclohexane, carry out esterification reaction under reflux state. After the reaction is finished, cool down first, use a rotary evaporator to concentrate and remove cyclohexane and excess ethanol, distill under reduced pressure, collect fractions at 100-160°C under a vacuum of 0.09MPa to obtain mixed polyester;
[0040] The second step: Preparation of VOC auxilia...
Embodiment 3
[0043]What cosolvent selects in this embodiment is the mixture of propylene glycol butyl ether, n-propyl acetate, isopropanol, what mixed acid selects is the mixture of oxalic acid, malonic acid, citric acid, and what low-carbon alcohol selects is n-propyl Alcohol, toluenesulfonic acid is selected as the catalyst, and cyclohexane is selected as the water-carrying agent;
[0044] Step 1: Preparation of mixed polyester: In a 100mL round bottom flask equipped with a thermometer, reflux condenser and water separator, add 5.5g oxalic acid, 4.0g malonic acid, 6.8g citric acid, 10.6g normal Propanol and 4.5g ethylene glycol were heated up to 50°C and stirred to dissolve evenly, then 3.6g p-toluenesulfonic acid and 30mL cyclohexane were added, and the esterification reaction was carried out under reflux. After the reaction is finished, cool down first, use a rotary evaporator to concentrate to remove cyclohexane and excess ethanol, distill under reduced pressure, collect a fraction at...
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