Plasticizer and plastic product

Abstract

A plasticizer, which is biodegradable, has a molecule including a central structure, at least two connecting structures and at least one side-chain structure. The central structure includes at least one of a benzene derivative and at least one amino acid. The connecting structures are respectively connected to the central structure, wherein the connecting structures include a first connecting structure and a second connecting structure. The first connecting structure is an amine group, and the second connecting structure is a carboxyl group. The side-chain structure is a chain of multiple carbon atoms, and the side-chain structure is connected to at least one of the first connecting structure and the second connecting structure. An amide bond is formed as the side-chain structure connected to the amine group, and an ester bond is formed as the side-chain structure connected to the carboxyl group.

What is claimed is: 
     
       1. A plasticizer, which is biodegradable, a molecule of the plasticizer comprising:
 a central structure comprising at least one amino acid; and 
 at least two side-chain structures, wherein each of the at least two side-chain structures is a chain of multiple carbon atoms, an amide bond is formed as one of the at least two side-chain structures connected to an amine group of the at least one amino acid, and an ester bond is formed as another one of the at least two side-chain structures connected to an a carboxyl group of the at least one amino acid; 
 wherein a number of carbon atoms of the side-chain structure which is connected to the amine group is nNC, a number of carbon atoms of the side-chain structure which is connected to the carboxyl group is nOC, and the following condition is satisfied:
   0.01≤nNC/(nNC+nOC)<1.00;
 
 
 wherein nNC is positive integer and nOC is positive integer. 
 
     
     
       2. The plasticizer of  claim 1 , wherein the following condition is satisfied:
   0.20≤nNC/(nNC+nOC)≤0.70.
 
 
     
     
       3. The plasticizer of  claim 2 , wherein the following condition is satisfied:
   0.30≤nNC/(nNC+nOC)≤0.50.
 
 
     
     
       4. The plasticizer of  claim 1 , wherein the number of carbon atoms of the side-chain structure which is connected to the amine group is nNC, a number of oxygen atoms of the side-chain structure which is connected to the carboxyl group is nOO, and the following condition is satisfied:
   0.45≤nNC/(nNC+nOO)≤1.00.
 
 
     
     
       5. The plasticizer of  claim 1 , wherein the at least one amino acid is aspartate acid. 
     
     
       6. The plasticizer of  claim 1 , wherein the central structure comprises at least two of the amino acid. 
     
     
       7. The plasticizer of  claim 1 , wherein a molecular weight of the plasticizer is MwP, and the following condition is satisfied:
   450 Dalton≤MwP.
 
 
     
     
       8. The plasticizer of  claim 1 , further comprising:
 at least one polar functional group connected to one of the at least two side-chain structures, wherein the at least one polar functional group is a carboxyl group, a hydroxyl group, an amine group or a phosphoryl group. 
 
     
     
       9. The plasticizer of  claim 8 , wherein the plasticizer comprises at least two of the polar functional group, which are selected from the group consisting of the carboxyl group, the hydroxyl group, the amine group and the phosphoryl group. 
     
     
       10. A plastic product, which is biodegradable, comprising:
 the plasticizer of  claim 1 ; and 
 a polyester plastic, wherein the polyester plastic is a polylactic acid, a polybutylene succinate, a poly (butylene adipate-co-terephthalate) or a polyhydroxyalkanoate; 
 wherein the plasticizer is mixed with the polyester plastic. 
 
     
     
       11. The plasticizer of  claim 1 , wherein the number of carbon atoms of the side-chain structure which is connected to the carboxyl group is nOC, a number of oxygen atoms of the side-chain structure which is connected to the carboxyl group is nOO, and the following condition is satisfied:
   2≤nOC/nOO.