Polyester resin compositions with reduced emission of volatile organic compounds
A resin composition, the technology of the composition, applied in the field of low profile additives, low VOC products and parts, A-type SMC mixture, unsaturated polyester field, can solve the problem of unable to reduce VOC emissions and so on
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Embodiment 1
[0098] Example 1) SMC with LP-polyester modified by Desmodur TT-G, based on 0.9 parts Trigonox 117 and tempered board (190°C, 30 minutes)
[0099] Headspace measurement conditions:
[0100] Sample size: 0.5×0.5cm
[0101] Sample mass: 300mg
[0102] Number of samples measured: 3
[0103] Temper the SMC board at 190°C for 30 minutes
[0104] Prepare various SMC compositions with different uretdione component contents according to the components shown in Table 1, just adopt the amount of uretdione component in the preparation process of LPA-A component to make the urea in the SMC composition The diketone content reached the expected value.
[0105] table 3:
[0106] Desmodur TT
[0107] 3 shows that tempering reduces the concentration of styrene below the detection limit. If 0.4 or 0.5 part of Desmodur TT-G is incorporated into the LP-polyester, so is ethylhexanol. Because of the high vapor pressure, the concentrations of tert-butanol and acetone are signifi...
Embodiment 2
[0108] Example 2) Desmodur TT-G is added to the SMC of the formulation as a separate component, based on 0.9 Part Trigonox 117 and tempered plate (19°C, 30 minutes)
[0109] Headspace test conditions such as embodiment 1
[0110] Table 4:
[0111] Desmodur TT
[0112] From the above results it is known that the addition of Desmodur TT-G (as a separate component) to the SMC formulation results in less reduction in ethyl hexanol. Therefore, it is even more effective to incorporate Desmodur TT into the LP-Polyester.
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