Polyester composition as well as preparation method and application thereof
A composition and polyester technology, applied in the field of polyester compositions, can solve the problems of poor barrier properties of polylactic acid, inability to apply barrier requirements, low elongation at break, etc., and achieve reduced oxygen permeability and tensile strength. Increase, the effect of increasing the dielectric constant
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[0090] The present invention also provides a preparation method of the polyester composition described above, comprising the following steps:
[0091] After mixing the polylactic acid and polyester S, the polyester composition is obtained by melt extrusion and granulation.
[0092] In the preparation method of the polyester composition, the raw material components used are the same as above, and will not be repeated here.
[0093] In some embodiments of the present invention, the melting temperature is 170-250° C., and the time is 2-10 min. In certain embodiments, the melting temperature is 180°C or 230°C and the time is 3 min or 5 min.
[0094] In certain embodiments of the present invention, the melt extrusion pelletization is performed in a twin screw extruder.
[0095] The present invention also provides an application of the above-mentioned polyester composition as a barrier packaging material or a dielectric material;
[0096] The polyester composition is the polyeste...
Embodiment 1
[0103] Preparation of polyester S:
[0104] Step 1): Under the protection of nitrogen, 2,5-furandicarboxylic acid, 1,6-adipic acid and 1,4-butanediol are subjected to transesterification under the action of catalyst tetrabutyl titanate, 180°C The reaction was stirred for 4 hours, and the reaction pressure was 0.01 MPa to form a prepolymer; wherein, the molar ratio of 1,4-butanediol to the total moles of 1,6-adipic acid and 2,5-furandicarboxylic acid was 3:1 ; The molar ratio of 2,5-furandicarboxylic acid to 1,6-adipic acid is 7:3; the moles of tetrabutyl titanate to the sum of the moles of 1,6-adipic acid and 2,5-furandicarboxylic acid ratio of 0.3%.
[0105] Step 2): the prepolymer prepared in step 1) is evacuated to 5Pa, and the reaction is stirred at 230° C. for 10h to obtain polyester S.
[0106] The obtained polyester S was analyzed by hydrogen nuclear magnetic spectrum, and the results were as follows figure 1 shown. figure 1 It is the hydrogen nuclear magnetic spect...
Embodiment 2
[0111] Preparation of polyester S:
[0112] Step 1): Under nitrogen protection, 2,4-furandicarboxylic acid, 1,5-glutaric acid and 1,4-butanediol are subjected to transesterification under the action of catalyst tetrabutyl titanate, 180°C The reaction was stirred for 4 h, and the reaction pressure was 0.01 MPa to form a prepolymer; wherein, the molar ratio of 1,4-butanediol to the molar sum of 1,5-glutaric acid and 2,4-furandicarboxylic acid was 3:1 ; the molar ratio of 2,4-furandicarboxylic acid to 1,5-glutaric acid is 3:3; the moles of tetrabutyl titanate to the total moles of 1,5-glutaric acid and 2,4-furandicarboxylic acid ratio of 0.3%.
[0113] Step 2): the prepolymer prepared in step 1) is evacuated to 5Pa, and the reaction is stirred at 230° C. for 10h to obtain polyester S.
[0114] The polyester S has the structure shown in formula I, wherein R 1 It has the structure shown in formula II, p=3; R 2 It has the structure shown in formula III-1; m=118, n=118.
[0115]...
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