Sealing composite material, preparation method, and application thereof

Abstract

A sealing composite includes a molecular formula as follows: ##STR00001##

Claims

1. A sealing composite, comprising a molecular formula as follows: ##STR00018##

2. The sealing composite according to claim 1, wherein a connection between a NH.sub.2 bond and a HOOC bond in the molecular formula is a hydrogen bond, and the hydrogen bond is a noncovalent bond.

3. The sealing composite according to claim 1, wherein the sealing composite is prepared by a raw material, and the raw material comprises a first polymer and a second polymer, wherein the first polymer has a molecular formula as follows: ##STR00019## wherein the second polymer has a molecular formula as follows: ##STR00020##

4. The sealing composite according to claim 3, wherein a molar ratio of the first polymer to the second polymer ranges from 0.2 to 5.

5. The sealing composite according to claim 3, wherein the first polymer is prepared by a raw material, and the raw material comprises a compound A and a compound C, and the compound A is p-aminothiophenol and the compound C is vinyl terminated siloxane; wherein the compound A has a molecular formula as follows: ##STR00021## wherein the compound C has a molecular formula as follows: ##STR00022##

6. The sealing composite according to claim 5, wherein a molar ratio of the compound C to the compound A ranges from 0.25 to 4.

7. The sealing composite according to claim 3, wherein the second polymer is prepared by a raw material, and the raw material comprises a compound B and a compound C, and the compound B is p-mercaptobenzoic acid and the compound C is vinyl terminated siloxane; wherein the compound B has a molecular formula as follows: ##STR00023## wherein the compound C has a molecular formula as follows: ##STR00024##

8. The sealing composite according to claim 7, wherein a molar ratio of the compound C to the compound B ranges from 0.25 to 4.

9. A preparation method for the sealing composite of claim 1, comprising following steps: dissolving a first polymer and a second polymer in tetrahydrofuran to obtain a mixture solution and stirring the mixture solution at 20 to 40 C. for 24 to 96 hours; drying the mixture solution in a vacuum environment at 40 to 80 C. for 10 to 25 minutes to obtain a remaining mixture solution; and coating the remaining mixture solution on a glass substrate and drying in a vacuum environment at 40 to 60 C. to obtain the sealing composite; wherein the sealing composite is prepared by a raw material, and the raw material comprises a first polymer and a second polymer; wherein the first polymer has a molecular formula as follows: ##STR00025## and wherein the second polymer has a molecular formula as follows: ##STR00026##

10. A sealing ring comprising the sealing composite of claim 1.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings can also be obtained from those skilled persons in the art based on these drawings without paying any creative effort.

(2) The FIGURE is a stress-strain curve of a tensile test for a test specimen composed of the sealing composite material after being healed according to one embodiment of the present invention.

DETAILED DESCRIPTION OF SPECIFIC EMBODIMENTS OF THE INVENTION

(3) Hereinafter, a sealing composite, a preparation method, and technical solutions applied to the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

(4) A sealing composite material having a self-healing property is achieved by introducing a hydrogen bond between an amine group and a carboxylic acid group. The sealing composite has a molecular formula as follows:

(5) ##STR00011##

(6) Moreover, a preparation method for the sealing composite includes preparing steps for a first polymer, a second polymer, and a target product. The first polymer is vinyl terminated siloxane-g-p-aminothiophenol and the second polymer is vinyl terminated siloxane-g-p-mercaptobenzoic acid.

(7) In other embodiments, the first polymer and the second polymer may also be provided directly in accordance with the teachings of the present invention without the need for separate preparation. However, in order to disclose the preparation process of the target product in detail, the preparation process of the first polymer and the second polymer will be exemplified below.

(8) The first polymer is prepared by a raw material, and the raw material includes p-aminothiophenol (referred to as compound A) and vinyl terminated siloxane (referred to as compound C).

(9) The compound A has a molecular formula as follows:

(10) ##STR00012##

(11) Preferably, the compound C has a molecular formula as follows:

(12) ##STR00013##

(13) Furthermore, a preparation method for the first polymer is described as follows:

(14) adding the compound C (0.5-30 mmol) to a round bottom flask, and then adding enough tetrahydrofuran (100 mL) and stirring for 9-24 hours to obtain a first mixture solution;

(15) dissolving the 2-aminoethanethiol solution (20 mL-160 mL) in tetrahydrofuran/ethanol (v/v=10:1)(5 mL-40 mL) and stirring at room temperature for 6 to 10 hours to obtain a second mixture solution, and a volume ratio of the tetrahydrofuran/ethanol mixture solution to the 2-aminoethanethiol solution being preferably 1:4;

(16) adding the second mixture solution to the first mixture solution to obtain a third mixture solution;

(17) adding 2,2-dimethylolpropionic acid (0.5-30 mmol) to the third mixture solution, and then adding the compound A, and a molar ratio of the compound C to the compound A ranging from 0.25 to 4, and stirring the mixture solution again for 12 hours to get a grafted product; and washing the precipitates with methanol at room temperature and drying the precipitates in a vacuum environment, for example, at 40 to 80 C. for 24 to 96 hours to obtain a dried first polymer.

(18) The first polymer has a molecular formula as follows:

(19) ##STR00014##

(20) Furthermore, the second polymer is prepared by a raw material, the raw material includes compound B and compound C. The compound B is p-aminothiophenol and the compound C is vinyl terminated siloxane.

(21) Preferably, the compound B has a molecular formula as follows:

(22) ##STR00015##

(23) Preferably, the compound C has a molecular formula as follows:

(24) ##STR00016##

(25) Furthermore, a preparation method for the second polymer is described as follows:

(26) adding the compound C (0.5-30 mmol) to a round bottom flask, and then adding enough tetrahydrofuran (100 mL) and stirring for 9-24 hours to obtain a first mixture solution;

(27) dissolving the 2-aminoethanethiol solution (20 mL-160 mL) in tetrahydrofuran/ethanol (v/v=10:1)(5 mL-40 mL) and stirring at room temperature for 6 to 10 hours to obtain a second mixture solution, and a volume ratio of the tetrahydrofuran/ethanol mixture solution to the 2-aminoethanethiol solution being preferably 1:4;

(28) adding the second mixture solution to the first mixture solution to obtain a third mixture solution;

(29) adding 2,2-dimethylolpropionic acid (0.5-30 mmol) to the third mixture solution, and then adding the compound B, and a molar ratio of the compound C to the compound B ranging from 0.25 to 4, and stirring the mixture solution again for 12 hours to get a grafted product; and

(30) washing the precipitates with methanol at room temperature and drying the precipitates in a vacuum environment, for example, at 40 to 80 C. for 24 to 96 hours to obtain a dried second polymer.

(31) The second polymer has a molecular formula as follows:

(32) ##STR00017##

(33) Furthermore, a preparation method for the target product is described as follows:

(34) dissolving the first polymer and the second polymer in 100 mL tetrahydrofuran to obtain a mixture solution, and a molar ratio of the first polymer to the second polymer ranging from 0.2-5;

(35) stirring the mixture solution at 20 to 40 C. for 24 to 96 hours and drying the mixture solution in a vacuum environment, for example, at 40 to 80 C. to volatilize a part of the solvent in the mixture solution for 10 to 25 minutes;

(36) coating the remaining mixture solution on a glass substrate and drying in a vacuum environment at 40 to 60 C. to obtain the target product.

(37) Furthermore, a sealing ring includes the sealing composite according one embodiment of the present invention.

(38) The sealing composite is applied to a tensile strength test. Two samples are taken, and one of the samples is scratched by a scalpel and has a mark of length of 20 mm and a depth of 5 mm, and healing the scratched sample. The scratched sample is referred to as healing sample. For example, the scratched sample is healed, but not limited to, in the OVEN cavity at 450 C. environment for 1 hour, and the other sample is maintained without any treatment, which is referred to as original sample. Then, the healing sample and the original sample are applied to a tensile strength test, respectively. The tensile speed of the tensile test is 12.5 mm/s, but is not limited thereto. A stress-strain curve of a tensile test for the healing sample and the original sample is shown in the FIGURE.

(39) Referring to the FIGURE, the maximum stress of the original sample and the healing sample corresponding to the maximum ordinate value is described as follows:
.sub.max-orign=28.42 MPa; .sub.max-heal=23.3 MPa.

(40) The maximum elongation at break of the two sample is described as follows:
.sub.max-orign=745%; .sub.max-heal=675%:

(41) Accordingly, the repair efficiency of the maximum break stress of the healing sample is 23.3/28.42=82.04%, that is, the ratio of the maximum stress of the two sample is multiplied by 100%. In addition, the repair efficiency calculated according to the elongation at break is 90.6. %. The results show that the sealing composite according to embodiments of the present invention has an excellent self-healing property, great durability, and practical value.

(42) In the above, the present application has been described in the above preferred embodiments, but the preferred embodiments are not intended to limit the scope of the invention, and a person skilled in the art may make various modifications without departing from the spirit and scope of the application. The scope of the present application is determined by claims.