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Preparation method of biodegradable aliphatic-aromatic copolyester

A biodegradable and aliphatic technology, which is applied in the field of preparation of biodegradable aliphatic-aromatic copolyesters, can solve the problems of low mechanical properties of polymer molecular weight, environmental problems, strength and other mechanical properties, and achieve the solution of raw materials costly effect

Inactive Publication Date: 2012-05-30
SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although this preparation method ensures stable processing and use performance, it hinders its modification at the molecular structure level in the later stage
Once the synthesis is completed, the subsequent processing is simply blending with other materials, which has great limitations in the degree of change in its properties, and it is difficult to meet the requirements of some specific occasions
[0008] In addition, the mechanical properties such as strength of the used polyester plastics are greatly reduced due to natural sunlight, differentiation and microbial decomposition, which is mainly due to the reduction of molecular weight caused by the hydrolysis of polyester molecular chains.
The reuse of these plastics cannot meet the original use requirements, so discarding is currently the most commonly used treatment method for this kind of plastics, which has caused serious environmental problems.
Although subsequent processing such as chain extension can further improve the molecular weight and mechanical properties of polyester plastics, most of the chain extenders currently available are toxic and not suitable for large-scale production. The performance is still lower than the polyester plastic before use, and these subsequent processing will further increase the cost of the product, so this method is not a good solution to this problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] 41g polytrimethylene terephthalate (commercially available, M w =10000g / mol), 35g of succinic acid, 55g of 1,3-propanediol, and 0.04g of tetraisopropyl titanate were added into a 250mL three-necked flask equipped with a mechanical stirring device. After all the materials are added, equip the flask with a set of condensation device, vacuumize and fill with nitrogen three times, remove the oxygen in the reaction vessel to ensure that the esterification and transesterification reactions are carried out under nitrogen, and heat until the reaction mixture is completely melted / dissolved After forming a homogeneous system, the reaction was stirred at 215° C. for 4 h. During this process, water was distilled from the reaction mixture as a by-product until the amount of distillate reached 92% of the theoretically calculated amount. (The theoretically calculated amount of water is twice the molar amount of succinic acid)

[0062] 0.03g of stannous octoate and 0.05g of triethyl p...

Embodiment 2

[0066] 91g polyhexamethylene adipate (commercially available, M w =5000g / mol), 19g of dimethyl terephthalate (DMT), 30g of 1,6-hexanediol, and 0.03g of antimony acetate were added to a 250mL three-necked flask equipped with a mechanical stirring device. After all the materials are added, equip the flask with a set of condensation device, vacuumize and fill with nitrogen three times, remove the oxygen in the reaction vessel to ensure that the transesterification reaction is carried out under nitrogen, and heat until the reaction mixture is completely melted / dissolved into a homogeneous phase After the system, the reaction was stirred at 230° C. for 4 h. During this process, methanol was distilled out from the reaction mixture as a by-product until the amount of the distillate reached 92% of the theoretically calculated amount. (The theoretically calculated amount of methanol is twice the molar amount of DMT)

[0067] 0.02g of dibutyltin oxide and 0.04g of trimethyl phosphate w...

Embodiment 3

[0071] Add 44g of polybutylene terephthalate (recovered, unknown molecular weight), 44g of adipic acid, 70g of 1,4-butanediol, and 0.04g of tetraisopropyl titanate into a 250mL three-port tank equipped with a mechanical stirring device. in the bottle. After all the materials are added, equip the flask with a set of condensation device, vacuumize and fill with nitrogen three times, remove the oxygen in the reaction vessel to ensure that the esterification and transesterification reactions are carried out under nitrogen, and heat until the reaction mixture is completely melted / dissolved After forming a homogeneous system, the reaction was stirred at 230° C. for 3.5 h. During this process, water was distilled from the reaction mixture as a by-product until the amount of distillate reached 92% of the theoretically calculated amount. (The theoretically calculated amount of water is twice the molar amount of adipic acid)

[0072] 0.04g of antimony trioxide and 0.04g of triethyl pho...

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Abstract

The invention relates to a preparation method of a biodegradable aliphatic-aromatic copolyester, comprising the following steps of: a) carrying out polymerization between aliphatic dibasic acid, ester, acid anhydride or their mixture and dihydric alcohol to obtain an aliphatic polyester with a certain molecular weight, adding aromatic diacid, ester, acid anhydride or their mixture into dihydric alcohol for ester interchange or esterification, and carrying out vacuum-pumping for copolymerization to obtain the biodegradable aliphatic-aromatic copolyester; or b) carrying out copolymerization between aromatic diacid, ester, acid anhydride or their mixture and dihydric alcohol to obtain the aromatic polyester with a certain molecular weight; adding aliphatic dibasic acid, ester, acid anhydride or their mixture into dihydric alcohol for ester interchange or esterification, and carrying out vacuum-pumping for copolymerization to obtain the biodegradable aliphatic-aromatic copolyester. The product prepared by the method provided by the invention can be used in biodegradable molded products and for a purpose of mixing it with starch.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a method for preparing biodegradable aliphatic-aromatic copolyesters. The degradable aliphatic-aromatic copolyesters prepared by the method have excellent mechanical, thermal and thermodynamic properties, etc. Performance, can be used to prepare film, spinning, sheet, ink and other products. Background technique [0002] Since the middle of the last century, with the continuous progress and development of polymer synthesis technology and synthesis equipment, large-scale development of synthetic polyester has occurred. Among them, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and polytrimethylene terephthalate (PTT) have been developed successively and successfully realized industrialization . These three polyesters have complementary properties and each has advantages and disadvantages. They are active in light industry, machinery, electroni...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/181C08G63/78
Inventor 赵冬云杨桂生
Owner SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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