High stability color-less rosin pentaerythrite ester and its prepn
A rosin pentaerythritol ester and high-stability technology, which is applied in the field of high-stability colorless rosin pentaerythritol ester and its preparation, can solve the problems such as the color, thermal stability and weather resistance of rosin esterified products cannot meet the higher requirements of esterified products. , to achieve the effect of good thermal stability and weather resistance, complex production process and light color of the product
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Embodiment 1
[0023] A high-stability colorless rosin pentaerythritol ester, the resin has a Hasson color number less than 150; good thermal stability: placed in a blast drying oven at 180°C for 8 hours, the color change is not more than 1 Ghanaian color number; weather resistance Good: 15h at 20°C and 50cm away from 500W UV lamp, the weight gain rate is not more than 0.2%, and the color change is not more than 3 Ghanaian colors.
Embodiment 2
[0025] A method for preparing high-stability colorless rosin pentaerythritol ester, including the following steps:
[0026] In the first step, the super-grade rosin is distilled at a vacuum of 0~1kPa and a temperature of 180~270℃. The Ghana color number of the color produced is no greater than No. 3, the acid value is 160mg / g~190mg / g, and the softening point is 70℃. ~85℃ refined rosin;
[0027] In the second step, in an inert atmosphere, the inert atmosphere can be N 2 , Ar, He, CO 2 In the refined rosin, add pentaerythritol which accounts for 11.0-16.0% of the refined rosin mass, a decolorant which accounts for 0.1-1.0% of the refined rosin mass, and anthraquinone as an antioxidant which accounts for 0.01-0.1% of the refined rosin mass. A catalyst with 0.1% to 0.5% rosin mass is used for esterification at 230 to 290°C. The reaction is 3-10 hours, and the reaction is completed until the acid value is less than 20mg / g; among them, the decolorizing agent is 4,4-thiobis- (6-tert-buty...
Embodiment 3
[0033] Add 1000g refined rosin, 140g pentaerythritol, 2g 300, 0.2g anthraquinone, 3g ZnO into the reaction flask, and pass N 2 , Heat to 280±2℃, react until the acid value is less than 20mg / g, reduce pressure, keep the vacuum degree at 0~0.6kPa until there is no distillate, reduce the temperature to 220℃, add 1g 2,6-di-tert-butyl- 4-methylphenol, 1 g of tris(nonylphenyl phosphite) and 1 g of 2-hydroxy-4-n-octyloxybenzophenone.
[0034] The product in this example (colorless rosin pentaerythritol ester 1) color: 150 (Hasson color number), acid value: 14.2 mg / g, softening point: 105.1°C, thermal stability test (180°C, 8h): color, 200 (Hassen color number); weather resistance test: weight gain rate, 0.20%, color increased by 3 Ghana color numbers.
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