A kind of preparation method and application of pet nucleating additive modified and grafted with small glycol molecules
A technology of small molecules and glycols, which is applied in the field of preparation of PET nucleating additives modified and grafted with small molecules of glycols, can solve problems such as hindering molecular chain movement, high glass transition temperature, and large molecular chain rigidity. Achieve the effect of significant crystallization modification, increase crystallization rate, and easy alignment
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Embodiment 1
[0024] Such as figure 1 As shown, the present invention discloses a method for preparing a PET nucleating additive modified and grafted with glycol small molecules, comprising the following steps:
[0025] Glycol small molecule surface modified inorganic oxide nanoparticles: add 3.0g inorganic oxide nanoparticles (pre-dried for 24 hours in a vacuum oven at 80°C) in a 250mL three-necked flask, add 25mL benzene to make it Dissolve, protect with nitrogen, and add 25ml of thionyl chloride dropwise through a separatory funnel, then there will be HCl and SO 2 Generated and reacted at 65 degrees for 4 hours. Then the reaction mixture was centrifuged at 7000r / min for 7min. And wash with benzene three times, take 2.0g after vacuum drying and add to 20mL of toluene, add 20mL of small diol molecules under magnetic stirring, and react for 5 hours under nitrogen protection at 65°C. Finally, the reaction mixture was centrifuged at 7000r / min for 7min, and washed twice with toluene. In ord...
Embodiment 2
[0031] Such as figure 2 As shown, the present invention discloses a method for preparing a PET nucleating additive modified and grafted with glycol small molecules, comprising the following steps:
[0032] 1,5-pentanediol surface modified nano-silica: Add 3.0g nano-silica (pre-dried for 24 hours at 80°C in a vacuum oven) into a 250mL three-necked flask, add 25mL benzene to make it Dissolve, protect with nitrogen, and add 25ml of thionyl chloride dropwise through a separatory funnel, then there will be HCl and SO 2 Generated and reacted at 65 degrees for 4 hours. Then the reaction mixture was centrifuged at 7000r / min for 7min. And wash with benzene three times, after vacuum drying, take 2.0g and add to 20mL toluene, add 20mL 1,5-pentanediol under magnetic stirring, and react for 5 hours under nitrogen protection at 65°C. Finally, the reaction mixture was centrifuged at 7000r / min for 7min, and washed twice with toluene. In order to remove unreacted 1,5-pentanediol, it was wa...
Embodiment 3
[0037] Experimental purpose and method: In order to study the influence of the low molecular weight PET chain segment nucleating additive modified and grafted by diols on the crystallization kinetics of linear polyester crystallization, this example synthesized 1, 5-pentanediol modified and grafted low-molecular-weight PET segment nucleation additive was used as the experimental object to study its effect on the crystallization kinetics of linear polyester chips. The specific method was: using DSM Xplore 5&15 micro-blender The melt blending method is fully mixed, and a standard sample is made in a DSM Xplore 10cc micro-injection molding machine. The melting temperature in the blender is 290°C, the mold temperature in the injection molding machine is 50°C for pure linear polyester, and the 1,5-pentanediol modified and grafted low molecular weight PET segment nucleating additive synthesized in Example 2 is added Later changed to 40°C. A total of 1,5-pentanediol modified and gra...
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