Kind of biodegradable polyester and its preparation method

A biodegradable polyester having a number-average molecular weight of 6000-135000 g/mol, a molecular weight distribution of from 1.2-6.5 and a crystallization temperature range of from 15° C.-105° C., comprising 94-99.9 mole percent Component A and 0.1-6 mole percent Component B, wherein

• Component A comprises Component A1 and Component A2 having a molar ratio of 0.35-1.6:1;
• Component A1 comprises 20-100 mole percent Component A11 and 0-80 mole percent Component A12;
• Component A11 is selected from the group consisting of aliphatic dibasic acid, cyclic aliphatic dibasic acid, esterified derivatives of aliphatic dibasic acid, esterified derivatives of cyclic aliphatic dibasic acid, and mixtures thereof;
• Component A12 is selected from the group consisting of an aromatic dibasic acid, an ester of an aromatic dibasic acid, and mixtures thereof;
• Component A2 comprises 80-99.9 mole percent Component A21 and 0.1-20 mole percent Component A22;
• A21 comprises at least one of the following substances:
• an aliphatic dibasic alcohol with a carbon atom number of C2-C8, a cyclic aliphatic dibasic alcohol or polycyclic aliphatic dibasic alcohol with a carbon atom number of C5-C16, an aliphatic polyether dibasic alcohol, or a hydroxyl aliphatic acid;
• A22 comprises at least one of the following substances:
• a dibasic alcohol containing aromatic nucleus or a polyether dibasic alcohol containing an aromatic nucleus or a hydroxyl organic acid containing an aromatic nucleus with a carbon atom number of C8-C18;
• Component B is Component B3;
• Component B3 is selected from the group consisting of carbonized diimine compounds, wherein the carbonized diimine compound is carbonized diimine monomer, poly carbonized diimine or the mixture made up of two or more kinds of carbonized diimine compounds containing 1-30 carbonized diimine groups in their molecular structure with the molecular weight of 40-30000 g/mol at any ratio;
• wherein the biodegradable polyester is biodegradable.

A biodegradable polyester having a number-average molecular weight of 6000-135000 g/mol, a molecular weight distribution of 1.2-6.5 and a crystallization temperature range of from 15° C.-105° C., comprising 94-99.9 mole percent of Component A and 0.1-6 mole percent of Component B;

• wherein
• Component A comprises Component A1 and Component A2 at a molar ratio of 0.35-1.6:1;
• Component A1 comprises 20-100 mole percent of Component A11 and 0-80 mole percent of Component A12;
• Component A11 is selected from the group consisting of aliphatic dibasic acid, cyclic aliphatic dibasic acid, esterified derivatives of aliphatic dibasic acid, esterified derivatives of cyclic aliphatic dibasic acid, and mixtures thereof;
• Component A12 is selected from the group consisting of an aromatic dibasic acid, an ester of aromatic dibasic acid, and mixtures thereof;
• Component A2 comprises 80-99.9 mole percent Component A21 and 0.1-20 mole percent Component A22;
• A21 comprises at least one of the following substances:
• an aliphatic dibasic alcohol with a carbon atom number of C2-C8, a cyclic aliphatic dibasic alcohol or polycyclic aliphatic dibasic alcohol with a carbon atom number of C5-C16, an aliphatic polyether dibasic alcohol, and a hydroxyl aliphatic acid;
• A22 comprises at least one of the following substances:
• a dibasic alcohol containing aromatic nucleus or a polyether dibasic alcohol containing an aromatic nucleus or a hydroxyl organic acid containing an aromatic nucleus with a carbon atom number of C8-C18;
• Component B is selected from the group consisting of Component B2, Component B3, and mixtures thereof at any mass ratio;
• Component B2 is selected from the group consisting of isocyanurate cyclic polybasic alcohol or isocyanate polyether polybasic alcohol, and mixtures thereof, wherein the isocyanurate cyclic polybasic alcohol and isocyanate polyether polybasic alcohol has the molecular structure as shown in Formula III:
• in which, R10, R11 and R12 could be same or different, which are all —H, —CH3 or —CH2CH3;
• m, n and k are numerals selected from any of the positive numbers satisfying the condition of m+n+k equals from 3 to about 30;
• and
• wherein Component B3 is a carbonized diimine compound, wherein the carbonized diimine compound is carbonized diimine monomer, poly carbonized diimine or the mixture made up of two or more kinds of carbonized diimine compounds containing 1-30 carbonized diimine groups in their molecular structure with the molecular weight of 40-30000 g/mol at any ration;
• wherein the biodegradable polyester is biodegradable.