TWI500655B - Phosphinated copolyester and manufacturing method thereof - Google Patents

Description

Phosphorus copolyester and preparation method thereof

This invention relates to a copolyester, and more particularly to a phosphorus copolyester.

Polyester is a general term for polymers obtained by polycondensation of polybasic acids or anhydrides with polyols. Although there are many kinds of polyethers, polyethylene terephthalate (PET) is still mainly used. The bulk of polyester. Polyethylene terephthalate is a semi-crystalline polymer having excellent properties such as heat resistance, chemical resistance, toughness, electrical insulation, safety, and the like. At the same time, because of its low price, it is widely used in fiber, container, product packaging, electrical parts or composite materials made of glass fiber. However, polyethylene terephthalate itself is flammable, and the glass transition temperature is not high, so the application is still relatively limited. Therefore, how to make polyethylene terephthalate no longer limited to these limitations is an urgent problem to be solved.

In the past, methods to improve the flammability of polyethylene terephthalate, for example, in 1973, Toyobo added 7-9% of oligomeric sulfonylbisphenol phenylphosphonate to polyterephthalic acid. In ethylene glycol, Toyobo Corporation, in 1978, itaconic acid and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (9,10-dihydro-9-oxA) -I0-phosphaphenanthrene 10-oxide, DOPO) Synthesis of a novel phosphorus-containing diester, and the introduction of this new phosphorus-containing diester into polyethylene terephthalate or in 2004, scholars added novel nitrogen and phosphorus additives to the poly In ethylene terephthalate.

However, the manner in which the aliphatic structure is introduced does not effectively increase the glass transition temperature of polyethylene terephthalate. Furthermore, the foregoing methods are all physical additions of the additive type, so that uneven distribution or phase separation often occurs, which adversely affects the mechanical properties of polyethylene terephthalate.

Therefore, one aspect of the present invention provides a phosphorus-based copolyester obtained by acid-resolving and condensation-reacting a phosphorus-based compound having an ethoxylated group and a carboxyl group. The phosphorus-based copolyester not only has flame retardancy, but also has a relatively high glass transition temperature.

Next, another aspect of the present invention provides a method for producing a phosphorus-based copolyester by mixing a phosphorus-based compound having an ethoxylated group and a carboxyl group with a polyester to promote acid hydrolysis thereof. Condensation reaction. The phosphorus-based copolyester obtained by the reaction has not only flame retardancy but also a relatively high glass transition temperature.

According to one embodiment of the present invention, a phosphorus-based copolyester obtained by acid hydrolysis and condensation reaction of a phosphorus compound and a polyester is provided, and the phosphorus compound has the following formula (A). Structure: Wherein R is a hydrogen atom, a phenyl group or an alkyl group having 1 to 6 carbon atoms.

According to an embodiment of an aspect of the present invention, the polyester may be polyethylene terephthalate or polyethylene naphthalate (PEN), and the phosphorus-based copolyester may have the following formula (AI) Or the structure shown in formula (A-II):

Wherein n is an integer from 2 to 10, x and y are both greater than 0 and the sum of x and y is one.

According to an embodiment of another aspect of the present invention, a method for preparing a phosphorus-based copolyester is provided, which comprises providing a phosphorus compound and a polyester, and mixing the phosphorus compound with the polyester and heating to perform an acid hydrolysis. The reaction and a condensation reaction are carried out to form a phosphorus-based copolyester. Among them, the phosphorus compound has a structure represented by the following formula (A): And R is a hydrogen atom, a phenyl group or an alkyl group having 1 to 6 carbon atoms.

According to an embodiment of another aspect of the present invention, in the step of mixing the phosphorus compound with the polyester and heating, the heating temperature may be 270 ° C to 300 ° C. In the step of providing the phosphorus compound and the polyester, the polyester may have a structure represented by the following formula (I) or formula (II):

Wherein n is an integer from 2 to 10, and m is an integer from 30 to 100. Further, the step of mixing the phosphorus-based compound with the polyester may be carried out under a nitrogen atmosphere or may be carried out under a nitrogen atmosphere and a vacuum atmosphere.

Fig. 1 is a schematic view showing the synthesis of a phosphorus-based copolyester according to an embodiment of the present invention.

2 is a schematic view showing the synthesis of a phosphorus-based copolyester according to another embodiment of the present invention.

Fig. 3 is a graph showing the DSC analysis of Examples 1-3 and Comparative Example 1 of the present invention.

Fig. 4 is a TGA analysis chart of Examples 1-3 and Comparative Example 1 of the present invention.

Fig. 5 is a DMA analysis chart of Examples 4-7 of the present invention and Comparative Example 1.

Fig. 6 is a TGA analysis chart of Examples 4-7 of the present invention and Comparative Example 1.

Please refer to FIG. 1 , which is a schematic view showing the synthesis of a phosphorus-based copolyester according to an embodiment of the present invention. As shown in the figure, a phosphorus-based copolyester (AI) can be obtained by mixing a phosphorus-based compound (A) with a polyester (I) to carry out an acid hydrolysis and a condensation reaction, wherein R can be a hydrogen atom, a phenyl group or an alkyl group having 1 to 6 carbon atoms, n may be an integer of 2 to 10, m may be an integer of 30 to 100, and x and y represent a composition fraction of a phosphorus-based copolyester (AI), and x, y is greater than 0 and the sum of x and y is 1. More specifically, the phosphorus compound (A) can be obtained by a reaction formula shown below. As for polyester (I), it can be obtained from commercially available commercial polyesters such as polyethylene terephthalate, polypropylene terephthalate (PPT), polybutylene terephthalate. Polybutylene terephthalate (PBT) or other polyesters of different carbon chains.

Please refer to FIG. 2, which is a schematic view showing the synthesis of a phosphorus-based copolyester according to another embodiment of the present invention. As shown in the figure, the phosphorus-based copolyester (A-II) can be obtained by mixing an phosphorus compound (A) with a polyester (II) to carry out an acid hydrolysis and a condensation reaction, wherein R can be hydrogen. An atom, a phenyl group or an alkyl group having 1 to 6 carbon atoms, n may be an integer of 2 to 10, m may be an integer of 30 to 100, and x and y represent a composition ratio of the phosphorus-based copolyester (A-II). And x and y are both greater than 0 and the sum of x and y is 1. The synthesis reaction formula of the phosphorus compound (A) is the same as described above, and the polyester (II) can also be obtained from a commercially available commercial polyester such as polyethylene naphthalate or polypropylene naphthalate (Polypropylene). Naphthalate, PPN), polybutylene naphthalate (PBN) or other polyesters of different carbon chains, and the like.

Hereinafter, the phosphorus-based copolyesters of various embodiments of the present invention and a method for preparing the same will be further described.

Example 1-7

First, a phosphorus compound (A1) and a polyester (I) are provided,

The synthesis method of the phosphorus compound (A1) will be explained later, while the polyester (I) is commercially available polyethylene terephthalate, and m represents the number of repeating units.

Thereafter, the phosphorus compound (A1) and the polyester (I) are seven different molar ratios of 75:25, 50:50, 25:75, 20:80, 15:85, 10:90, and 5:95. , respectively, placed in a separate reactor and stirred and mixed. During the process, nitrogen gas was introduced and heated to 275 ° C and stirring was continued for 0.5 hours. After being completely dissolved, the temperature was raised to 280 ° C to 300 ° C, the nitrogen gas was turned off and the vacuum was changed. Stirring was continued for 4 hours to carry out acid hydrolysis and condensation reaction of the phosphorus compound (A1) with the polyester (I). Next, the dark red solid which was allowed to cool after the reaction was crushed and taken out, placed in a vacuum oven, and dried under vacuum at 140 ° C, and the obtained khaki powder was a phosphorus-based copolyester (A1-I). Wherein x and y are composition fractions of the phosphorus-based copolyester (A1-I), x and y are both greater than 0 and the sum of x and y is 1.

Polyether (I) and different molar ratios using differential scanning calorimetry (DSC), Thermogravimetric analysis (TGA), and Dynamic mechanical analyzer (DMA) The phosphorus-based copolyesters (A1-I) obtained by the reaction were analyzed to examine their respective thermal stability properties such as glass transition temperature (Tg), thermal cracking temperature (Td), and flame retardancy test. . The relevant physical property results are shown in Table 1-1, Table 1-2, and Figures 3 to 6 below.

Example 8-10

First, a phosphorus compound (A1) and a polyester (I) are provided, and then the phosphorus compound (A1) and the polyester (I) are respectively at a molar ratio of 75:25, 50:50, and 25:75, respectively. The mixture is stirred and mixed in a separate reactor to carry out acid hydrolysis and condensation reaction of the phosphorus compound (A1) and the polyester (I). The difference from the foregoing Examples 1-7 is that the phosphorus compound (A1) and the polyester (I) are only mixed with nitrogen gas and stirred to 275 ° C for 4 hours while stirring, and the temperature is maintained during the reaction. At 275 ° C.

Then, the dark red solid which was allowed to cool after the reaction was crushed and taken out and placed in a vacuum oven, and dried under vacuum at 140 ° C. The obtained khaki powder was a phosphorus-based copolyester (A1-I), and each of them was The physical property analysis test results of glass transition temperature, thermal cracking temperature, and flame retardancy are shown in Table 2 below.

Example 11-13

First, a phosphorus compound (A2) and a polyester (I) are provided, The manner in which the phosphorus compound (A2) is synthesized will be explained later, and the polyester (I) is the same as described above.

Thereafter, the phosphorus compound (A2) and the polyester (I) are respectively placed in a separate reactor at a molar ratio of 75:25, 50:50, and 25:75, and stirred and mixed. And heated to 275 ° C and stirring for 0.5 hours, after the complete dissolution, the temperature was raised to 280 ° C ~ 300 ° C, the nitrogen was turned off and the vacuum was changed and stirring was continued for 4 hours to make the phosphorus compound (A2) and polyester ( I) Perform acid hydrolysis and condensation reaction. Next, the dark red solid which was allowed to cool after the reaction was crushed and taken out and placed in a vacuum oven, and dried under vacuum at 140 ° C. The obtained khaki powder was a phosphorus-based copolyester (A2-I). Wherein x and y are composition fractions of the phosphorus-based copolyester (A2-I), x and y are both greater than 0 and the sum of x and y is 1.

The physical property analysis test results of the glass transition temperature, the thermal cracking temperature, and the flame retardancy of each phosphorus-based copolyester (A2-I) are shown in Table 3 below.

Example 14-16

First, a phosphorus compound (A2) and a polyester (I) are provided, and then the phosphorus compound (A2) and the polyester (I) are respectively at a molar ratio of 75:25, 50:50, and 25:75, respectively. The mixture is stirred and mixed in a separate reactor to carry out acid hydrolysis and condensation reaction of the phosphorus compound (A2) with the polyester (I). The difference from the foregoing Examples 11-13 is that the phosphorus compound (A2) and the polyester (I) are only mixed with nitrogen gas and stirred to 275 ° C for 4 hours while stirring, and the temperature is maintained during the reaction. At 275 ° C.

Then, the dark red solid which was allowed to cool after the reaction was crushed and taken out and placed in a vacuum oven, and dried under vacuum at 140 ° C. The obtained khaki powder was a phosphorus-based copolyester (A2-I), and each of them was The physical property analysis test results of glass transition temperature, thermal cracking temperature, and flame retardancy are shown in Table 4 below.

Example 17-19

First, a phosphorus compound (A3) and a polyester (I) are provided, The synthesis mode of the phosphorus compound (A3) will be explained later, and the polyester (I) is the same as described above.

Thereafter, the phosphorus compound (A3) and the polyester (I) are respectively placed in a separate reactor at a ratio of three different molar ratios of 75:25, 50:50 and 25:75, and a nitrogen gas is introduced during the process. And heating to 275 ° C and stirring for 0.5 hours, after the complete dissolution, the temperature is raised to 280 ° C ~ 300 ° C, turn off the nitrogen and vacuum and continue to stir for 4 hours, so that the phosphorus compound (A3) and polyester ( I) Perform acid hydrolysis and condensation reaction. Then, the dark red solid which was allowed to cool after the reaction was crushed and taken out, placed in a vacuum oven, and dried under vacuum at 140 ° C, and the obtained khaki powder was a phosphorus-based copolyester (A3-I). Wherein x and y are composition fractions of the phosphorus-based copolyester (A3-I), x and y are both greater than 0 and the sum of x and y is 1.

The physical property analysis test results of the glass transition temperature, the thermal cracking temperature, and the flame retardancy of each phosphorus-based copolyester (A3-I) are shown in Table 5 below.

Example 20-22

First, a phosphorus compound (A3) and a polyester (I) are provided, and then the phosphorus compound (A3) and the polyester (I) are respectively at a molar ratio of 75:25, 50:50, and 25:75, respectively. The mixture is stirred and mixed in a separate reactor to carry out acid hydrolysis and condensation reaction of the phosphorus compound (A3) with the polyester (I). The difference from the foregoing Examples 17-19 is that the phosphorus compound (A3) and the polyester (I) are only mixed with nitrogen gas and stirred to 275 ° C for 4 hours while stirring, and the temperature is maintained during the reaction. At 275 ° C.

Next, the dark red solid which was allowed to cool after the reaction was crushed and taken out and placed in a vacuum oven, and dried under vacuum at 140 ° C. The obtained khaki powder was a phosphorus-based copolyester (A3-I), and each of them was The physical property analysis test results of glass transition temperature, thermal cracking temperature, and flame retardancy are shown in Table 6 below.

Example 23-25

First, a phosphorus compound (A1) and a polyester (II) are provided, Wherein the phosphorus-based compound (A1) is the same as described above, and the polyester (II) is a commercially available polyethylene naphthalate, and m represents the number of repeating units.

Thereafter, the phosphorus compound (A1) and the polyester (II) are respectively placed in a separate reactor at a ratio of three different molar ratios of 75:25, 50:50 and 25:75, and a nitrogen gas is introduced during the process. And heated to 285 ° C and stirring for 0.5 hours, after the complete dissolution, the temperature was raised to 290 ° C ~ 300 ° C, the nitrogen was turned off and the vacuum was changed and stirring was continued for 4 hours to make the phosphorus compound (A1) and polyester ( II) Perform acid hydrolysis and condensation reaction. Next, the dark red solid which was allowed to cool after the reaction was crushed and taken out, placed in a vacuum oven, and dried under vacuum at 140 ° C, and the obtained khaki powder was a phosphorus-based copolyester (A1-II). Wherein x and y are composition fractions of the phosphorus-based copolyester (A1-II), x and y are both greater than 0 and the sum of x and y is 1.

The phosphorus-based copolyesters (A1-II) obtained by reacting polyester (II) and different molar ratios were also analyzed by DSC and TGA to examine their respective glass transition temperatures, thermal cracking temperatures and flame retardancy. The relevant physical properties are shown in Table 7 below.

Example 26-28

First, a phosphorus compound (A1) and a polyester (II) are provided, and then Phosphorus compound (A1) and polyester (II) are placed in a separate reactor at 75:25, 50:50 and 25:75, respectively, and stirred and mixed to make the phosphorus compound (A1). Acid hydrolysis and condensation reaction with polyester (II). The difference from the foregoing Examples 23-25 is that the phosphorus compound (A1) and the polyester (II) are only mixed with nitrogen gas and stirred to 285 ° C for 4 hours while stirring, and the temperature is maintained during the reaction. At 285 ° C.

Next, the dark red solid which was allowed to cool after the reaction was crushed and taken out and placed in a vacuum oven, and dried under vacuum at 140 ° C. The obtained khaki powder was a phosphorus-based copolyester (A1-II), and each of them was The physical property analysis test results of glass transition temperature, thermal cracking temperature, and flame retardancy are shown in Table 8 below.

Example 29-31

First, a phosphorus compound (A2) and a polyester (II) are provided, wherein the phosphorus compound (A2) and the polyester (II) are the same as described above. Thereafter, the phosphorus compound (A2) and the polyester (II) are respectively placed in a separate reactor at a molar ratio of 75:25, 50:50, and 25:75, and stirred and mixed. And heated to 285 ° C and stirring for 0.5 hours, after the complete dissolution, the temperature was raised to 290 ° C ~ 300 ° C, the nitrogen was turned off and the vacuum was changed and stirring was continued for 4 hours to make the phosphorus compound (A2) and polyester ( II) Perform acid hydrolysis and condensation reaction. Then, the dark red solid which was allowed to cool after the reaction was crushed and taken out, placed in a vacuum oven, and dried under vacuum at 140 ° C, and the obtained khaki powder was a phosphorus-based copolyester (A2-II). Wherein x and y are composition fractions of the phosphorus-based copolyester (A2-II), x and y are both greater than 0 and the sum of x and y is 1.

The physical property analysis test results of the glass transition temperature, the thermal cracking temperature, and the flame retardancy of each phosphorus-based copolyester (A2-II) are shown in Table 9 below.

Examples 32-34

First, a phosphorus compound (A2) and a polyester (II) are provided, and then the phosphorus compound (A2) and the polyester (II) are at 75:25, 50:50, and 25: 75 three different molar ratios are separately placed in a separate reactor and stirred and mixed to cause acid hydrolysis and condensation reaction of the phosphorus compound (A2) with the polyester (II). The difference from the foregoing Examples 29-31 is that the phosphorus compound (A2) and the polyester (II) are only mixed with nitrogen gas and stirred to 285 ° C for 4 hours while stirring, and the temperature is maintained during the reaction. At 285 ° C.

Then, the dark red solid which was allowed to cool after the reaction was crushed and taken out and placed in a vacuum oven, and dried under vacuum at 140 ° C. The obtained khaki powder was a phosphorus-based copolyester (A2-II), and each of them was The physical property analysis test results of glass transition temperature, thermal cracking temperature, and flame retardancy are shown in Table 10 below.

Example 35-37

First, a phosphorus compound (A3) and a polyester (II) are provided, wherein the phosphorus compound (A3) and the polyester (II) are the same as described above. Thereafter, the phosphorus compound (A3) and the polyester (II) are respectively placed in a separate reactor at a ratio of three different molar ratios of 75:25, 50:50 and 25:75, and a nitrogen gas is introduced during the process. And heated to 285 ° C and stirring for 0.5 hours, after the complete dissolution, the temperature was raised to 290 ° C ~ 300 ° C, the nitrogen was turned off and vacuum was added and stirring was continued for 4 hours to make the phosphorus compound (A3) and polyester ( II) Perform acid hydrolysis and condensation reaction. Then, the dark red solid which was allowed to cool after the reaction was crushed and taken out, placed in a vacuum oven, and dried under vacuum at 140 ° C. The obtained khaki powder was a phosphorus-based copolyester (A3-II). Wherein x and y are composition fractions of the phosphorus-based copolyester (A3-II), x and y are both greater than 0 and the sum of x and y is 1.

The physical property analysis test results of the glass transition temperature, the thermal cracking temperature, and the flame retardancy of each phosphorus-based copolyester (A3-II) are shown in Table 11 below.

Example 38-40

First, a phosphorus compound (A3) and a polyester (II) are provided, and then the phosphorus compound (A3) and the polyester (II) are respectively at a molar ratio of 75:25, 50:50, and 25:75, respectively. Placed in a separate reactor for mixing and mixing The phosphorus compound (A3) and the polyester (II) are subjected to an acid hydrolysis and a condensation reaction. The difference from the above Examples 35-37 is that the phosphorus compound (A3) and the polyester (II) are only mixed with nitrogen gas and stirred to 285 ° C for 4 hours while stirring, and the temperature is maintained during the reaction. At 285 ° C.

Then, the dark red solid which was allowed to cool after the reaction was crushed and taken out and placed in a vacuum oven, and dried under vacuum at 140 ° C. The obtained khaki powder was a phosphorus-based copolyester (A3-II), and each of them was The physical property analysis test results of glass transition temperature, thermal cracking temperature, and flame retardancy are shown in Table 12 below.

In summary, the phosphorus-based copolyester according to different embodiments of the present invention not only has flame retardancy, but also has a relatively high glass transition temperature, thereby effectively improving the problem that the conventional polyester is flammable and the glass transition temperature is low, so that the scope of subsequent applications is And the field is more extensive.

The preparation method of the phosphorus compound (A1), the phosphorus compound (A2), and the phosphorus compound (A3) will be described below.

Phosphorus compound (A1)

First, 20 g (92.5 mmole) of DOPO, 12.41 g (92.5 mmole) of 4-methylacetophenone, 43.5352 G (462.5 mmole) of phenol and acidic catalyst (4 wt% based on DOPO) were placed in a three-necked round bottom flask, and nitrogen gas was introduced and heated to 130 ° C, and the reaction was continuously stirred for 12 hours. After the reaction, methanol was poured and stirring was continued for a while, and then a white powder was precipitated. Then, suction filtration is carried out, and the filter cake is placed in a vacuum oven and vacuum-dried at 100 ° C to obtain a first product, wherein the yield is 50% and the melting point of the first product is 294 ° C as measured by DSC. .

Next, 15 g (35.2 mmole) of the first product, 0.15 g of sodium acetate, and 50 mL of acetic anhydride were placed in a three-necked round bottom flask, and nitrogen gas was introduced and heated to 130 ° C. The reaction was continuously stirred for 12 hours. After the reaction was completed, the material was precipitated by cooling, and then the precipitate was obtained by filtration and washed several times with deionized water. Then, suction filtration was carried out, and the filter cake was placed in a vacuum oven and vacuum-dried at 140 ° C to obtain a second product in a white powder, wherein the yield was 92%, and the second product was obtained by DSC measurement. The melting point is 216 ° C.

Then, 15 g (32.0 mmole) of the second product, 0.15 g of sodium bromide (NaBr), 0.15 g of cobalt (II) acetate, Co(OAc) 2, and 0.15 g of manganese acetate were taken. (manganese (II) acetate, Mn (OAc) 2) and 0.30 g of dicumyl peroxide were placed in a three-necked round bottom flask, and oxygen was introduced and heated to 110 ° C. Stirring reaction was continued 12 hour. After the reaction was completed, the material was precipitated by cooling, and then the precipitate was obtained by filtration and washed several times with deionized water. Then, suction filtration is carried out, and the filter cake is placed in a vacuum oven and dried under vacuum at 140 ° C to obtain a third product in a white powder, wherein the yield is 80%, and the third product is a phosphorus system. Compound (A1).

Phosphorus compound (A2)

Take 20g (92.5mmole) of DOPO, 18.16g (92.5mmole) of 4-methylbenzophenone, 43.5352g (462.5mmole) of phenol and acidic catalyst (4wt% based on DOPO) Stir in a three-neck round bottom flask, pass nitrogen gas and heat to 130 ° C, and continue stirring for 12 hours. After the reaction, methanol was poured and stirring was continued for a while, and then a white powder was precipitated. Then, suction filtration is carried out, and the filter cake is placed in a vacuum oven and vacuum-dried at 100 ° C to obtain a first product, wherein the yield is 50% and the melting point of the first product is 290 ° C as measured by DSC. .

Next, 15 g (30.7 mmole) of the first product, 0.15 g of sodium acetate, and 50 mL of acetic anhydride were placed in a three-necked round bottom flask, and nitrogen gas was introduced and heated to 130 ° C, and the reaction was continuously stirred for 12 hours. After the reaction was completed, the material was precipitated by cooling, and then the precipitate was obtained by filtration and washed several times with deionized water. Then, suction filtration was carried out, and the filter cake was placed in a vacuum oven and vacuum-dried at 140 ° C to obtain a second product in a white powder, wherein the yield was 92%, and the second product was obtained by DSC measurement. The melting point is known to be 206 ° C.

Then, 15 g (28.3 mmole) of the second product, 0.15 g of sodium bromide, 0.15 g of cobalt acetate, 0.15 g of manganese acetate, and 0.30 g of dicumyl peroxide were placed in a three-necked round bottom bottle and stirred. The oxygen was introduced and heated to 110 ° C, and the reaction was continuously stirred for 12 hours. After the reaction was completed, the material was precipitated by cooling, and then the precipitate was obtained by filtration and washed several times with deionized water. Then, suction filtration is carried out, and the filter cake is placed in a vacuum oven and dried under vacuum at 140 ° C to obtain a third product in a white powder, wherein the yield is 80%, and the third product is a phosphorus system. Compound (A2).

Phosphorus compound (A3)

20 g (92.5 mmole) of DOPO, 11.12 g (92.5 mmole) of 4-methylbenzaldehyde, 43.5352 g (462.5 mmole) of phenol, and an acidic catalyst (4 wt% based on DOPO) were placed in three The flask was stirred in a round bottom flask, purged with nitrogen and heated to 130 ° C, and the reaction was stirred for 12 hours. After the reaction, methanol was poured and stirring was continued for a while, and then a white powder was precipitated. Then, suction filtration was carried out, and the filter cake was placed in a vacuum oven and vacuum-dried at 100 ° C to obtain a first product, wherein the yield was 50% and the melting point of the first product was 286 ° C as measured by DSC. .

Next, 15 g (36.4 mmole) of the first product, 0.15 g of sodium acetate, and 50 mL of acetic anhydride were placed in a three-necked round bottom flask, and nitrogen gas was introduced and heated to 130 ° C, and the reaction was continuously stirred for 12 hours. After the reaction was completed, the material was precipitated by cooling, and then the precipitate was obtained by filtration and washed several times with deionized water. Then, suction filtration is carried out, and the filter cake is placed in a vacuum oven and dried under vacuum at 140 ° C to obtain a second product in a white powder, wherein the yield is 92%, and the second product can be measured by DSC measurement. The melting point is known to be 201 ° C.

Then, 15 g (33.0 mmole) of the second product, 0.15 g of sodium bromide, 0.15 g of cobalt acetate, 0.15 g of manganese acetate, and 0.30 g of dicumyl peroxide were placed in a three-necked round bottom bottle and stirred. The oxygen was introduced and heated to 110 ° C, and the reaction was continuously stirred for 12 hours. After the reaction was completed, the material was precipitated by cooling, and then the precipitate was obtained by filtration and washed several times with deionized water. Then, suction filtration is carried out, and the filter cake is placed in a vacuum oven and dried under vacuum at 140 ° C to obtain a third product in a white powder, wherein the yield is 80%, and the third product is a phosphorus system. Compound (A3).

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. range This is subject to the definition of the scope of the patent application.

Claims (9)

A phosphorus-based copolyester obtained by acid hydrolysis and condensation reaction of a phosphorus-based compound having a structure represented by the following formula (A): Wherein R is a hydrogen atom, a phenyl group or an alkyl group having 1 to 6 carbon atoms. The phosphorus-based copolyester according to claim 1, wherein the polyester is polyethylene terephthalate, and the phosphorus-based copolyester has a structure represented by the following formula (AI): Wherein n is an integer from 2 to 10, x and y are both greater than 0 and the sum of x and y is one. The phosphorus-based copolyester according to claim 1, wherein the polyester is polyethylene naphthalate, and the phosphorus-based copolyester has a structure represented by the following formula (A-II): Wherein n is an integer from 2 to 10, x and y are both greater than 0 and the sum of x and y is one. A method for preparing a phosphorus-based copolyester, comprising: providing a phosphorus-based compound and a polyester, wherein the phosphorus-based compound has a structure represented by the following formula (A): And R is a hydrogen atom, a phenyl group or an alkyl group having 1 to 6 carbon atoms; and mixing the phosphorus compound with the polyester and heating to carry out an acid hydrolysis reaction and a condensation reaction, thereby forming the phosphorus copolymerization ester. The method for producing a phosphorus-based copolyester according to claim 4, wherein in the step of mixing the phosphorus-based compound with the polyester and heating, the heating temperature is 270 ° C to 300 ° C. The method for producing a phosphorus-based copolyester according to claim 4, wherein in the step of providing the phosphorus-based compound and the polyester, the polyester has a structure represented by the following formula (I): And n is an integer of 2 to 10, and m is an integer of 30 to 100. The method for producing a phosphorus-based copolyester according to claim 4, wherein in the step of providing the phosphorus-based compound and the polyester, the polyester has a structure represented by the following formula (II): And n is an integer of 2 to 10, and m is an integer of 30 to 100. The method for producing a phosphorus-based copolyester according to claim 4, wherein the step of mixing the phosphorus-based compound with the polyester and heating is carried out under a nitrogen atmosphere. The method for producing a phosphorus-based copolyester according to claim 4, wherein the step of mixing the phosphorus-based compound with the polyester and heating is carried out under a nitrogen atmosphere and a vacuum atmosphere.