A kind of waste polyester blend particle containing nylon and its preparation method and application
A waste polyester and nylon technology, applied in recycling technology, plastic recycling, etc., can solve the problems of unstable nylon content, inability to use it effectively, and difficulty in natural decomposition, so as to reduce refractory impurities and speed up the depolymerization reaction. effect of speed
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Embodiment 1
[0027] Pretreatment: Sorting and cutting recycled polyester-nylon fabrics (carpets, curtains), polyester-nylon composite yarns, etc., and densifying them for 15 minutes at a temperature of 150-260°C and a pressure of 0.1-10MPa, and forming them by thermal friction Process to prepare nylon waste polyester foam. The recovered polyamide pulp blocks are cleaned and crushed.
[0028] Extrusion and foaming: Feed the pretreated nylon waste polyester into the screw granulator, and the heating temperatures of each zone of the screw granulator are 250°C, 260°C, 270°C, 280°C, 275°C, 275°C, 270°C , the feeding percentage of the screw is 15%, the rotating speed is 55rpm, and the pressure is 8.0Mpa; the nitrogen gas is selected to be fed into the micropore formation, the gas feeding rate is 0.15 L / min, and the feeding position is the fourth heating zone of the screw, and the granulation is completed. After cooling the water tank, the formation of micropores was stable, and the prepared mic...
Embodiment 2
[0032] As described in Example 1, the difference is: the micropores are formed by using the chemical foaming agent AC (azodicarbonamide), which is fed together at the feeding port, and the ratio of foaming agent to raw materials is 1:350; preparation The relative density of waste polyester containing microporous nylon is 0.68. The ratio of PET (repeating unit) to ethylene glycol by mole percentage is 1:5 for nylon waste polyester material, and the ratio of catalyst zinc acetate is 0.2%; the depolymerization temperature of polyester (PET) is 190°C, the pressure is 0.2MPa, and the reaction time 1.5 hours; the depolymerization temperature of nylon is 255°C, and the reaction time is 2 hours; the relative viscosity of nylon is depolymerized to 1.26. (See Table 1 for the results)
Embodiment 3
[0034] As described in Example 1, the difference is: the foam material made of waste polyester and waste nylon at a ratio of 4:1 is used for foaming treatment, and the chemical foaming agent DPT (azodicarbonamide) is selected for micropore formation. , fed together at the feeding port, the ratio of foaming agent to raw material is 1:350; the relative density of waste polyester containing microporous nylon is 0.62. Nylon waste polyester material is made of PET (repeating unit) and ethylene glycol at a mole ratio of 1:4, and the catalyst zinc acetate ratio is 0.3%; the depolymerization temperature of polyester (PET) is 205°C, the pressure is 0.2MPa, and the reaction time is 2 hours ; Nylon depolymerization temperature is 255 ℃, reaction time 2 hours; Nylon depolymerization to a relative viscosity of 1.15. (See Table 1 for the results)
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