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Polyamide/siloxane copolymer and preparation method thereof

A technology of siloxane copolymer and polyamide, which is applied in the field of compound and its preparation, can solve the problems of lack of random silicone polyamide copolymer, affecting the mechanical properties of materials, complex solution polymerization process, etc., and achieve good low-temperature mechanical properties , The preparation method is simple and easy, and the effect of excellent biocompatibility

Pending Publication Date: 2019-02-01
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the current reports on the synthesis of silicone and polyamide copolymers use the solution polymerization method to synthesize block copolymers of polydimethylsiloxane with longer molecular chains and polyamides, while for the preparation of silicone There are few reports of polyamide random copolymers
Secondly, when the polydimethylsiloxane block copolymer is synthesized by the solution method, due to the poor compatibility of the two, phase separation is easy to occur, resulting in stress concentration effect, which affects the mechanical properties of the material, and the solution polymerization process is complicated. , there will be work such as product desolvation treatment and solvent recovery in the later stage

Method used

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  • Polyamide/siloxane copolymer and preparation method thereof
  • Polyamide/siloxane copolymer and preparation method thereof
  • Polyamide/siloxane copolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0023] A polyamide / siloxane copolymer obtained by copolymerizing dodecanedibasic acid, dodecanediamine and 1,3-bis(aminopropyl)tetramethyldisiloxane.

[0024] Its preparation method comprises the following steps:

[0025] 1) In a reaction kettle with a stirring device, sequentially add dodecanedibasic acid (9.5mol), dodecanediamine (8mol), 1,3-bis(aminopropyl)tetramethyldisilica Oxylkane (2mol), use high-purity nitrogen gas inflation-vacuumization-inflation, repeat the operation 3 times, replace the air in the reactor, to remove the oxygen in the system, ensure that the reaction is carried out under an inert gas atmosphere; in this step Dicarboxylic acid: the molar ratio of (diamine + amino-terminated siloxane) is 0.95:1, and the molar ratio of diamine and amino-terminated siloxane is 4:1;

[0026] 2) The system starts to heat up, and heats up at 10°C / min to 100°C for 2.5 hours, then raises the temperature at 10°C / min to 200°C for 4 hours, then deflates for 1 hour, and contin...

Embodiment 2

[0029] A polyamide / siloxane copolymer, which is obtained by copolymerization of ten-carbon dibasic acid, ten-carbon diamine, and 1,3-bis(aminopropyl)octamethyltetrasiloxane.

[0030] Its preparation method comprises the following steps:

[0031] 1) In a reaction kettle with a stirring device, sequentially add ten-carbon dibasic acid (9.7mol), ten-carbon diamine (7mol), 1,3-bis(aminopropyl)octamethyltetrasiloxane (3mol), through inflating-vacuumizing-inflating with high-purity nitrogen gas, repeat operation 3 times, replace the air in the reactor, to remove the oxygen in the system, guarantee that reaction is carried out under inert gas atmosphere; In this step, two Carboxylic acid: the molar ratio of (diamine + amino-terminated siloxane) is 9.7:10, and the molar ratio of ten-carbon diamine to amino-terminated siloxane is 7:3

[0032] 2) The system starts to heat up, heat up to 120°C at a rate of 15°C / min for 2 hours, continue to heat up to 230°C at a rate of 15°C / min to react...

Embodiment 3

[0035] A polyamide / siloxane copolymer obtained by copolymerizing adipic acid, hexamethylenediamine and 1,3-bis(aminopropyl)tetramethyldisiloxane.

[0036] Its preparation method comprises the following steps:

[0037] 1) In a reaction kettle with a stirring device, add adipic acid (9.8mol), hexamethylenediamine (6mol), 1,3-di(aminopropyl)tetramethyldisiloxane (4mol) in sequence, After inflating with high-purity nitrogen gas-vacuumizing-inflating, repeat the operation 3 times, replace the air in the reactor to remove the oxygen in the system, and ensure that the reaction is carried out under an inert gas atmosphere; in this step, the dicarboxylic acid: The molar ratio of (diamine + amino-terminated siloxane) is 9.8:10, and the molar ratio of hexamethylenediamine and amino-terminated siloxane is 6:4

[0038] 2) The system starts to heat up, heats up at 5°C / min to 100°C for 4 hours, heats up at 10°C / min to 270°C for 4 hours, then slowly deflates for 2 hours, and continues to rea...

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Abstract

The invention relates to a polyamide / siloxane copolymer and a preparation method thereof. The polyamide / siloxane copolymer is prepared through melt polycondensation of a C2-20 aliphatic or aromatic dicarboxylic acid, a C2-20 aliphatic or aromatic diamine and amino-terminated siloxane. The obtained polymer can be directly subjected to melt processing, has good low-temperature mechanical propertiesand excellent biocompatibility, and can be widely used in the production of sports apparatuses and medical apparatuses.

Description

technical field [0001] The invention belongs to the technical field of compounds and their preparation, in particular to a polyamide / siloxane copolymer and a preparation method thereof. Background technique [0002] As an important engineering plastic, nylon has the advantages of excellent mechanical properties, wear resistance, easy processing, corrosion resistance, and low density. It is widely used in automobiles, machinery, electronics, packaging, military and other fields. The polar amide bond structure in nylon repeating unit is the source of its outstanding mechanical properties, but it also causes this type of material to have strong water absorption capacity and poor biocompatibility, which limits its application in precision device manufacturing and biomedical fields. Applications. As we all know, silicon-oxygen bond (Si-O) is a typical water-repellent structure. Silicone with this as the basic repeating unit has excellent hydrophobicity, thermal stability, oxidat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/42
CPCC08G69/42
Inventor 崔喆付鹏赵清香刘民英肖哲吉菲菲
Owner ZHENGZHOU UNIV