Biodegradable polymer composition and its application

The present invention is calculated in parts by weight， i) 58 to 80 parts by weight of an aliphatic-aromatic copolyester; ii) 20 to 32 parts by weight starch; And iii) 0 to 10 parts by weight of a treating agent; Disclosed is a biodegradable polyester composition comprising as a component. The present invention， through the study， the aromatic carboxylic acid content of 44 mol% to 48 mol% of the total amount of diacid as an aliphatic-aromatic copolyester as a matrix resin， the width of the aliphatic-aromatic copolyester crystallization peak D Is 5 to 16 ， while using a starch having a particle size D (50) of 2 μm to 12 μm as another phase， and by adding a specific amount of the treatment agent， the polyester composition obtained is excellent in the longitudinal and transverse directions In addition to having tear strength， the polyester composition was found to be satisfactory as industrial compost， with a biodegradation rate of 90% or more during a 12 week biodegradation test. Disclosed is a biodegradable polyester composition， comprising the following components in percentage by weight: i) 58-80 parts of aliphatic-aromatic copolyester; ii) 20-32 parts of starch; and iii) 0-10 parts of processing assistant agents. According to the present invention， it can be unexpectedly found during studies that the aliphatic-aromatic copolyester in which the aromatic carboxylic acid is 44 mol%-48 mol% as the total amount of diacid is used as a base resin， the crystalline peak width D of the aliphatic-aromatic copolyester is 5??C-6??C， and the starch having the particle size D(50) of 2 ??m-12 ??m is used as another phase; meanwhile， a processing assistant agent having the particular content is added， the polyester composition obtained by preparing has excellent transverse and longitudinal tear strength， meets industrial compost， and has more than 90% of biodegradation rate in a 12-week degradation test process. Disclosed is a biodegradable polyester composition， comprising the following components in percentage by weight: i) 58-80 parts of aliphatic-aromatic copolyester; ii) 20-32 parts of starch; and iii) 0-10 parts of processing assistant agents. According to the present invention， it can be unexpectedly found during studies that the aliphatic-aromatic copolyester in which the aromatic carboxylic acid is 44 mol%-48 mol% as the total amount of diacid is used as a base resin， the crystalline peak width D of the aliphatic-aromatic copolyester is 5??C-6??C， and the starch having the particle size D(50) of 2 ??m-12 ??m is used as another phase; meanwhile， a processing assistant agent having the particular content is added， the polyester composition obtained by preparing has excellent transverse and longitudinal tear strength， meets industrial compost， and has more than 90% of biodegradation rate in a 12-week degradation test process.本发明公开了一种可生物降解聚酯组合物，其按重量份计包含如下组分：i) 58~80重量份的脂肪族-芳香族共聚酯（aliphatic-aromatic copolyester）；ii) 20~32重量份的淀粉；以及iii) 0~10重量份的处理剂。本发明经研究发现，以芳香族羧酸占二元酸总摩尔量44mol%~48mol%的脂肪族-芳香族共聚酯作为基体树脂，该脂肪族-芳香族共聚酯的结晶峰宽D为5~16℃；同时采用粒径D(50)为2μm~12μm的淀粉作为第二相，并添加特定用量的处理剂，所得聚酯组合物不仅具备优异的纵横撕裂强度，同时可满足工业堆肥要求，在12周生物降解测试中生物降解率可达90%以上。 本发明还公开了一种可生物降解聚酯组合物，其按重量份计包含如下组分：i) 58~80份脂肪族-芳香族共聚酯（aliphatic-aromatic copolyester）；ii) 20~32份淀粉；以及iii) 0~10份加工助剂。研究过程中可意外发现，以芳香族羧酸占二元酸总摩尔量44mol%~48mol%的脂肪族-芳香族共聚酯作为基体树脂，该脂肪族-芳香族共聚酯的结晶峰宽D为5~6℃；同时采用粒径D(50)为2μm~12μm的淀粉作为第二相，并添加特定用量的加工助剂，所得聚酯组合物具备优异的纵横撕裂强度，可满足工业堆肥要求，在12周降解测试过程中生物降解率可达90%以上。 本发明公开了一种可生物降解聚酯组合物，其按重量份计包含如下组分：i) 58~80份脂肪族-芳香族共聚酯（aliphatic-aromatic copolyester）；ii) 20~32份淀粉；以及iii) 0~10份加工助剂。研究过程中可意外发现，以芳香族羧酸占二元酸总摩尔量44mol%~48mol%的脂肪族-芳香族共聚酯作为基体树脂，该脂肪族-芳香族共聚酯的结晶峰宽D为5~6℃；同时采用粒径D(50)为2μm~12μm的淀粉作为第二相，并添加特定用量的加工助剂，所得聚酯组合物具备优异的纵横撕裂强度，可满足工业堆肥要求，在12周降解测试过程中生物降解率可达90%以上。