TW202022181A - Polyester filament and manufacturing method thereof, polyester base fabric, and resin impregnatedpolyester cord including at least one polyester chain segment and at least one (dicarboxylic acid radical phenyl) ester group bonded to the polyester chain segment - Google Patents

Abstract

A polyester filament is composed of modified polyester. The modified polyester contains at least one polyester chain segment and at least one (dicarboxylic acid radical phenyl) ester group bonded to the polyester chain segment. The characteristic viscosity of the modified polyester ranges from 0.6 to 1.0 dL/g and the total content of oligomers does not exceed 0.9 wt%. The acid value of the polyester filament ranges from 30 to 70 meq/kg. The present invention also provides a method for manufacturing polyester filaments, a polyester base fabric containing a plurality of polyester filaments, and a resin impregnated polyester cord fabric made from the polyester base fabric. The polyester filament of the present invention has a low oligomer content and has an active functional group with a high reactive activity. The bonding ability of the polyester base fabric to an adhesive for rubber is good, and the adhesion between the resin impregnated polyester cord fabric and rubber is also good.

Description

Polyester filament and manufacturing method thereof, polyester base fabric, and dipped polyester cord fabric

The present invention relates to a polyester filament, polyester base fabric and dipped polyester cord fabric, in particular to a polyester filament composed of modified polyester, a method for preparing the polyester filament, and Polyester base fabric and dipped polyester cord fabric made of ester filaments.

High-strength polyester filaments have a wide range of industrial uses, especially in conveyor belts, tire cords and other applications. For example, they are made into dipped polyester cords and bonded with rubber to reinforce the strength of the rubber. However, because of the insufficient number of reactive functional groups (such as carboxylic acid groups) on the surface of conventional high-strength polyester filaments that can react with epoxy resins, the polyester base fabric made from high-strength polyester filaments The rubber adhesive cannot form sufficient chemical bonds, resulting in insufficient adhesion between the dipped polyester cord and the rubber, and therefore the subsequent composite processing process cannot be carried out smoothly. In order to solve this problem, the conventional industry usually performs necessary surface modification treatment on the aforementioned high-strength polyester filament.

The conventional high-strength polyester filament surface modification treatment method is mainly through the modification treatment agent containing isocyanate compound (such as isocyanate) and epoxy resin (also called the first bath treatment agent). The surface of the high-strength polyester filament is modified to effectively increase the number of active functional groups on the surface of the high-strength polyester filament, and form a modified high-strength polyester filament. Then, it is treated with a rubber adhesive (also referred to as a second bath treatment agent) containing resorcinol formaldehyde latex (RFL) to prepare the aforementioned dipped polyester cord. This is the conventional two-bath dipping method for dipping polyester cords. Since the isocyanate compound and the resorcinol formaldehyde latex have good bonding properties, it can give the dipped polyester cord to the rubber to form good adhesion.

However, because isocyanic compounds have hidden concerns about environmental hazards, and may affect the health of operators, and their high chemical activity requires precise control of the process conditions in order to react under the best conditions.

Therefore, based on the aforementioned reasons and the increasing environmental awareness in recent years, we have developed a safer first bath treatment agent that can reduce or replace isocyanate compounds, or a dipping polymer that does not require the use of the first bath treatment agent. The ester cord manufacturing process has become a problem that the industry needs to solve.

On the other hand, the aforementioned high-strength polyester filaments will go through several heating processes during their preparation process and even in the subsequent processing to make the dipped polyester cord fabric. These heating processes will cause the high-strength polyester to grow longer. Many oligomers are produced and accumulated on the silk surface (existing studies have known that the content of oligomers is approximately 2 to 3 wt%). Those skilled in the art know that the excessive presence of these oligomers can cause many problems in the spinning process, such as spinning irregularities, broken filaments, or contamination of the production machine.

In order to solve the aforementioned problem of excessive oligomers on the surface of high-strength polyester filaments, it is conventionally known to reduce the temperature of the spinning process to suppress the production of excessive oligomers. However, lowering the temperature of the spinning process can easily lead to changes in the physical properties of high-strength polyester filaments, or lead to unsatisfactory spinning, resulting in uneven fiber diameters, and even subsequent processing to make rubber in the process of dipping polyester cords. The agent cannot completely cover the polyester base fabric, which reduces the bonding strength between the dipped polyester cord and the rubber.

Therefore, the development of a modified high-strength polyester filament that can reduce the oligomers generated in the heating process is also expected by the industry.

Therefore, the first object of the present invention is to provide a polyester filament with a low oligomer content and a reactive functional group with high reactivity.

Therefore, the polyester filament of the present invention is composed of a modified polyester, wherein the modified polyester contains at least one polyester segment, and at least one (dicarboxylic acid group) bonded to the polyester segment Phenyl) ester group, and the intrinsic viscosity of the modified polyester ranges from 0.6 to 1.0 dL/g, and the total content range of the oligomers of the modified polyester is not more than 0.9 wt%, and the polyester filament It has an acid value range of 30 to 70 meq/kg.

Therefore, the second object of the present invention is to provide a polyester base fabric with good bonding ability with the rubber adhesive.

Therefore, the polyester base fabric of the present invention contains a plurality of polyester filaments as described above.

Therefore, the third objective of the present invention is to provide a dipped polyester cord with good adhesion to rubber.

Therefore, the dipped polyester cord fabric of the present invention is prepared by a processing procedure, wherein the processing procedure includes the following steps: contacting a polyester base fabric as described above with the treatment component liquid to form dipped polyester The cord, wherein the treatment component liquid includes a second treatment liquid containing a rubber adhesive.

Therefore, the fourth object of the present invention is to provide a method for producing polyester filaments, which can produce polyester filaments with low oligomer content and high reactive functional groups.

The method for producing polyester filaments of the present invention includes the following steps: (1) Reacting polyester with carboxy phthalic anhydride to obtain modified polyester, which contains at least one polyester segment and at least A (dicarboxylic acid phenyl) ester group bonded to the polyester segment, the intrinsic viscosity of the modified polyester ranges from 0.6 to 1.0 dL/g, and the total oligomer of the modified polyester The content range is not more than 0.9 wt%; and (2) subjecting the modified polyester to a spinning process to obtain polyester filaments, wherein the acid value of the polyester filaments ranges from 30 to 70 meq/kg.

The effect of the present invention is that the present invention obtains the modified polyester having the (dicarboxylic phenyl) ester group by reacting the polyester with the carboxy phthalic anhydride, so that the modified polyester is The surface of the formed polyester filament has the (dicarboxylic acid phenyl) ester group, and the bonding ability between the polyester base fabric and the rubber adhesive is good, so that the adhesiveness of the dipped polyester cord fabric and rubber good.

Another effect of the present invention is that the present invention obtains the modified polyester by using the carboxyl phthalic anhydride and the polyester to react, so that the total content of the modified polyester oligomer is not more than 0.9 wt% , It also makes the polyester filament composed of the modified polyester have a lower oligomer content, so it can improve the oligomer pollution of the spinning equipment and the problem of spinning irregularities, thereby increasing the output of the polyester filament .

The content of the present invention will be described in detail below:

The term "polyester" in this article refers to any polyester material suitable for spinning, such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), etc., especially suitable for Polyester materials used in the production of tire cords and conveyor belts.

As used herein, "polyester filament" generally refers to an infinite or approximately infinite elongated object made of polyester or modified polyester.

As used herein, "oligomer" generally refers to oligomers produced in the process of synthesis or spinning processing. Specific types of oligomers include, but are not limited to, trimers, Tetramer, pentamer, hexamer, or any combination of the above.

As used herein, "rubber adhesive" generally refers to any adhesive used to bond polyester and rubber together, such as but not limited to resorcinol-formaldehyde-latex (resorcinol-formaldehyde-latex, RFL), butyl Diene/vinylpyridine/styrene copolymer latex, butadiene vinyl-pyridine rubber latex, etc.

The polyester filament of the present invention is composed of modified polyester which contains at least one polyester segment and at least one (dicarboxylic phenyl) ester group bonded to the polyester segment And the intrinsic viscosity of the modified polyester ranges from 0.6 to 1.0 dL/g, and the total content of oligomers of the modified polyester ranges not more than 0.9 wt%, and the polyester filaments have 30 to 70 meq /kg acid value range.

The repeating structural units contained in the polyester segment of the modified polyester include, but are not limited to, alkylene phthalate units and alkylene naphthalate units. Preferably, the polyester segment of the modified polyester contains alkyl phthalate units.

。The (dicarboxylic acid phenyl) ester group is a reactive group with high reactivity, which can make the polyester base fabric made from the polyester filament have good bonding ability with the rubber adhesive, thereby Therefore, the glued polyester cord fabric prepared from the polyester base fabric has a good adhesiveness with rubber. Preferably, the (dicarboxyphenyl) ester group of the modified polyester is a (2,4-dicarboxyphenyl) ester group, wherein the (2,4-dicarboxyphenyl) ester group The structural formula of the ester group is

.

式(I)。式(I)中，n為1以上。Preferably, the modified polyester has a fragment of formula (I):

Formula (I). In formula (I), n is 1 or more.

The manufacturing method of the polyester filament of the present invention includes the following steps: (1) Reacting polyester with carboxyl phthalic anhydride to obtain a modified polyester, which contains at least one polyester segment and at least one The (dicarboxylic phenyl) ester group bonded to the polyester segment, and the intrinsic viscosity of the modified polyester ranges from 0.6 to 1.0 dL/g, and the total oligomer of the modified polyester The content range is not more than 0.9 wt%; and (2) subjecting the modified polyester to a spinning process to obtain polyester filaments, wherein the acid value of the polyester filaments ranges from 30 to 70 meq/kg.

The carboxy phthalic anhydride can react the functional groups (such as hydroxyl) that are easy to form oligomers in the polyester and form the (dicarboxyphenyl) ester group with high reactivity, so it can make the modification The total content of polyester oligomers is not more than 0.9 wt%. Moreover, the carboxyl phthalic anhydride will not cross-link with the polyester, but can control the intrinsic viscosity of the modified polyester to be 0.6 to 1.0 dL/g, so that the modified polyester has good spinning properties Processability.

Preferably, the carboxy phthalic anhydride is 5-carboxy phthalic anhydride (ie, trimellitic anhydride, TMA for short).

Preferably, based on the total amount of the polyester being 100 parts by weight, the amount of carboxy phthalic anhydride ranges from 0.1 to 0.9 parts by weight; more preferably, from 0.3 to 0.5 parts by weight.

The spinning procedure can use an existing spinning method of polyester filaments, such as melt spinning. As long as the functions and properties of the polyester filament, polyester base fabric and dipped polyester cord of the present invention are not affected, the equipment and process conditions used in the melt spinning are not particularly limited, and can be adjusted freely according to the existing melt spinning technology .

In a specific embodiment of the present invention, a biaxial mixing and extruding equipment is used to make polyester ester pellets and carboxy phthalic anhydride through hot melting, mixing and reacting to obtain modified polyester, which is then pelletized to obtain The ester particles of the modified polyester are then formed into polyester filaments. However, the specific implementation of the present invention is not limited to the above, it can also be directly after the polyester ester particles and the carboxyl phthalic anhydride are mixed and reacted to obtain the modified polyester by using a biaxial kneading and extrusion equipment. The molten modified polyester is spun to form polyester filaments.

The specific forms of the polyester filament produced by the method for producing the polyester filament of the present invention are, for example, but not limited to, polyester fully stretched yarn, polyester processed yarn, and polyester semi-stretched yarn.

The polyester base fabric of the present invention contains a plurality of polyester filaments as described above. The preparation method of the polyester base fabric, for example, but not limited to: a plurality of polyester filaments are processed by false twisting and then spun, or directly spun.

The dipped polyester cord fabric of the present invention is made of the above-mentioned polyester base fabric. The preparation method of the dipped polyester cord fabric can be carried out according to known manufacturing methods (especially the manufacturing method used to form tire plies or conveyor belts). In an embodiment of the present invention, the dipped polyester cord fabric It is prepared by a processing procedure, wherein the processing procedure includes the following steps: contacting a polyester base fabric as described above with a processing component liquid to form a dipped polyester cord, wherein the processing component liquid includes A second treatment liquid containing a rubber adhesive.

Among them, the adhesive for rubber is as described above, and will not be repeated here. In some embodiments of the present invention, the second treatment liquid further includes a solvent, such as but not limited to water.

In some embodiments of the present invention, the treatment component liquid further includes a first treatment liquid containing epoxy resin, and in the treatment procedure, the polyester base cloth is brought into contact with the first treatment liquid to form The polyester base fabric is activated to increase the reactive functional groups of the polyester base fabric, and then the activated polyester base fabric is contacted with the second treatment liquid. The reactive functional group is, for example, an epoxy group or a hydroxyl group formed from the epoxy group of the epoxy resin. In some embodiments of the present invention, the first treatment liquid further includes an isocyanate compound, a surfactant, and a solvent, wherein the solvent is, for example, but not limited to, water.

The dipped polyester cord fabric of the present invention is mainly suitable for making tire cords, conveyor belts and the like.

The present invention will be further illustrated with the following examples, but it should be understood that the examples are only for illustrative purposes and should not be construed as limiting the implementation of the present invention.

[Chemicals and equipment] 1. Trimellitic anhydride: purchased from Jingming Chemical Co., Ltd., with a purity of 95%. Hereinafter referred to as TMA. 2. Pyromellitic dianhydride: purchased from Jingming Chemical Co., Ltd., with a purity of 98%. Hereinafter referred to as PMDA. 3. Polyethylene terephthalate pellets: Far East New Century Co., Ltd., model CH619, with an intrinsic viscosity of approximately 1.0 dL/g. Hereinafter referred to as PET ester pellets. 4. Biaxial mixing extrusion equipment: the manufacturer is Hongyu Machinery Co., Ltd., and the model is PSM50. 5. Spinning equipment: The manufacturer is Far East Chemical Fiber, which includes an extruder, a filter device (including glass beads and 8-layer filter), a spinneret, a heating processor, an extension machine and a winding machine.

[Example 1] Polyester filament (1) Using the biaxial kneading and extrusion equipment, 100 parts by weight of polyethylene terephthalate pellets (hereinafter referred to as PET pellets) were placed in the main tank and The main screw is fed, and 0.1 parts by weight of trimellitic anhydride is placed in the auxiliary tank and fed by the auxiliary screw. Set the rotation speed of the main screw and the sub-screw to 100 rpm, and the process temperature is controlled at 290℃, so that the PET ester granules and trimellitic anhydride are mixed through hot melting, and the trimellitic anhydride is uniformly dispersed in the PET ester granules and reacted with the PET ester granules to obtain the modification Polyester. Then, the modified polyester is extruded into ester strips, and then cooled and pelletized by a pelletizer to obtain modified polyester pellets. (2) Put the modified polyester pellets into the spinning equipment for spinning process. Firstly, use an extruder to melt the modified polyester pellets into a molten state at 290 to 310°C. The ester particles are filtered by a filter device, and the filtered molten modified polyester particles are extruded into filaments by a spinneret (spinning nozzle specification of 0.6Φ×96H), and the filaments are heated to about 300℃ by a heating processor. Perform heat setting treatment at the temperature of, and then perform multi-stage extension by stretching machine (total stretching ratio is about 5 to 5.3), and finally by winding machine at a winding speed of 2750 m/min to obtain polyester filament.

[Examples 2 to 5] Polyester filaments In the production of polyester filaments of Examples 2 to 5, in addition to changing the amount of trimellitic anhydride in step (1) according to Table 1, the remaining process conditions and steps in step (1) ( 2) The same conditions as in Example 1 were used.

[Comparative Example 1] Polyester filament In the manufacture of polyester filament in Comparative Example 1, except that trimellitic anhydride was not used, the remaining process conditions in step (1) and step (2) were performed using the same conditions as in Example 1. .

[Comparative Example 2] Polyester filament

In the manufacture of the polyester filament of Comparative Example 2, 0.3 parts by weight of pyromellitic dianhydride were used instead of trimellitic anhydride. The rest of the process conditions in step (1) and step (2) were the same as those used in Example 1. Under the same conditions.

註：酸酐的用量是以PET酯粒總重為100重量份計算；「TMA」表示偏苯三酸酐；「PMDA」表示均苯四甲酸二酐。Table 1

Note: The amount of acid anhydride is calculated based on the total weight of PET ester pellets as 100 parts by weight; "TMA" means trimellitic anhydride; "PMDA" means pyromellitic dianhydride.

[Property evaluation of modified polyester pellets] The modified polyester pellets obtained in step (1) of the above Examples 1 to 5, Comparative Examples 1 and 2 were subjected to the following property evaluations and test methods for each property evaluation As described below, and the evaluation results are shown in Table 2: 1. Intrinsic viscosity (IV): adding modified polyester pellets to a mixed solution [phenol/tetrachloroethane=3/2 (weight ratio)] , Prepare the test solution with a concentration of 0.4 wt/vol%, and then measure the intrinsic viscosity of the test solution with a Ubbelohde viscometer at a test temperature of 30±0.02°C. 2. Acid value: Add modified polyester pellets to a phenol-chloroform mixture to dissolve and cool, then prepare the test solution. Then, while stirring, add 3 to 5 drops of bromophenol blue indicator to the test solution, and then titrate the test solution with a 0.1N standard KOH-benzyl alcohol solution. The test solution is in the titration process. The color change of the color is yellow, yellow-green, blue (titration end point). Then calculate the acid value of the modified polyester pellet through the formula. 3. Alcohol value: The acid value and intrinsic viscosity of the modified polyester particles are calculated by the following formula to obtain the alcohol value of the modified polyester particles. IV=7.55×10 ^-4 ×Mn ^0.68 [COOH]+[OH]=2×10 ⁶ ÷Mn Wherein IV is intrinsic viscosity, Mn is number average molecular weight, [COOH] is acid value, and [OH] is alcohol value. 4. Oligomer content: (1). Weigh 5.0g (S) of modified polyester pellets and put it in the filter paper tube, and then put the filter paper tube in the Soxhlet extractor. (2). Weigh the flat-bottomed flask (A), and inject 1.67 times the siphon volume of the Soxhlet extractor into the flat-bottomed flask, so that the modified polyester pellets are completely immersed in the chloroform. For example, the siphon volume of a 250 ml Soxhlet extractor is about 90 ml, and the amount of chloroform is 90 ml × 1.67 = 150 ml. (3). Set up the Soxhlet extractor and assemble it with a flat-bottomed flask, and then place it in a constant temperature water bath for extraction for 4 hours. After the extraction, take out the filter paper cartridge. (4). Use an electric hot plate to evaporate the chloroform in the flat bottom flask to dryness, leaving the extract in the bottom flask. Place the flat-bottomed flask in an oven and dry it at 105±5°C for 1 hour. Then, the flat-bottomed flask was placed in a desiccator to cool, and weighed (B). (5). The content of extract (wt%)=(B-A)÷S×100wt%. (6). Total content of oligomer (wt%) = content of extract (wt%)-EG (wt%)-DEG (wt%)-TEG (wt%) B = weight of the flat bottom flask (g) ＋The weight of the extract (g); A=The weight of the flat-bottomed flask (g); S=The weight of modified polyester pellets (g); EG is ethylene glycol, DEG is diethylene glycol, TEG is triethylene glycol . (7). Use a gas chromatograph (manufacturer model PerkinElmer Clarus580) to measure trimers (hereinafter referred to as C3), tetramers (hereinafter referred to as C4), pentamers (hereinafter referred to as C5) and six The content of polymer (hereinafter referred to as C6). 5. The reduction of oligomers: The oligomer content of the polyester pellets of Comparative Example 1 is used as the comparison standard, and the same oligomer types are compared with each other. The following uses the example of calculating the reduction of the trimer (C3) of the polyester filament in Example 1. The reduction of the remaining types of oligomers and the total reduction of oligomers are obtained according to the same calculation logic. The decrease of the trimer (C3): (3747-3700)÷3747×100%=1.25%.

[Table 2] Property evaluation results of modified polyester pellets

[Discussion of results in Table 2]

It can be seen from the results in Table 2 that compared with Comparative Example 1, Examples 1 to 5 prepare modified polyesters by using trimellitic anhydride, so that the modified polyesters have a lower oligomer content. And compared to Comparative Example 1, the modified polyester of Examples 1 to 5 has a higher acid value, which means that the modified polyester is prepared by using trimellitic anhydride, so that the modified polyester has activated functional groups [ie (dicarboxylic acid) Phenyl) ester group]. On the other hand, more preferably, because the trimellitic anhydride added in the technology of the present invention is controlled in an appropriate range, the trimellitic anhydride and PET ester particles cannot undergo cross-linking reaction. Therefore, the intrinsic viscosity of the modified polyester of Examples 1 to 5 is lower than The similar range of Comparative Example 1 shows that using an appropriate amount of trimellitic anhydride to prepare the modified polyester will not cause the intrinsic viscosity of the modified polyester to increase significantly, and thus will not affect the spinning processability of the subsequent spinning process.

[Property evaluation of polyester filament] The properties of the polyester filaments of Example 2, Comparative Example 1 and Comparative Example 2 were respectively evaluated, and the evaluation results are summarized in Table 3: 1. Breaking strength: measured according to the standard method ASTM D885 . 2. Elongation at break: measured according to the standard method ASTM D885. 3. Heat shrinkage rate: measured according to the standard method ASTM D885, the measurement temperature is 177°C, and the measurement time is 2 minutes. 4. Spinnability: The evaluation standard of spinnability is that in the process of the spinning process, when the yarn breakage rate is less than 2 times/ton, the spinnability is "qualified"; the yarn breakage rate is greater than 2 times/ton. Tonnage hour means "unqualified" spinnability. 5. Wool condition: use a wool sensor (manufacturer model: fibervision Fraytec FV2) to detect. The evaluation criteria for the condition of the wool yarn is that when the number of wool yarns in the polyester filament ranges from 0 to 20, it means "pass", and when the number of wool yarns in the polyester filament exceeds 20, it means " Unqualified". 6. Decrease of oligomers: The oligomer content of the polyester filaments of Comparative Example 1 is used as the comparison benchmark, and the same oligomer types are compared with each other. The following uses an example of calculation of the decrease in the trimer (C3) of the polyester filament in Example 2. The decrease in the other types of oligomers and the decrease in the total amount of oligomers are obtained according to the same calculation logic. Wherein, the method for measuring the oligomer content of the polyester filament is the same as the method for measuring the oligomer content of the polyester particles, and will not be repeated here. The decrease of the trimer (C3): (11663-8222)÷11663×100%=1.25%.

[Table 3] Evaluation results of properties of polyester filament

[Discussion of results in Table 3]

It can be seen from the results in Table 3 that compared with Comparative Example 1, Example 2 uses trimellitic anhydride to produce polyester filaments, so that the polyester filaments have a lower oligomer content. Based on this, it can be seen that the polyester filaments of the present invention In the preparation process of the filament, although it has undergone several heating processes (such as the heating of the spinning process and the heat setting treatment), it is still difficult to cause the surface of the polyester filament to produce and accumulate many oligomers. In addition, the physical properties and spinning conditions of the polyester filaments of Example 2 are comparable to those of Comparative Example 1, indicating that the use of trimellitic anhydride to produce polyester filaments will not cause adverse effects on the physical properties and spinning conditions of the polyester filaments. However, in contrast to Comparative Example 2, because of the use of pyromellitic dianhydride to produce polyester filaments, the spinnability and wool condition are all unqualified.

[Application Example 1] Polyester base fabric and dipped polyester cord fabric (1) The polyester filament of Example 2 was prepared into a polyester base fabric using a plain weave method. The warp and weft density of the polyester base fabric is 20 pieces/inch×20 pieces/inch. (2) The polyester base fabric is first immersed in 1000 grams of the first treatment liquid to form a first impregnated cloth, and then the first impregnated cloth is dried at a temperature of 170°C for 90 seconds and heated at 245 Bake at a temperature of ℃ for 60 seconds. An activated polyester base fabric is obtained. Among them, the first treatment liquid contains 9.0 g epoxy resin (manufacturer is Nagase ChemteX Co., model is EX-614B), 31.0 g isocyanate compound (manufacturer is EMS, model is IL-6), 0.4g interface Active agent (manufacturer is Cytec Solvay Co., model OT-75, concentration is 75%), and 959.6 g of deionized water. (3) The activated polyester base is then immersed in 1000 grams of the second treatment liquid to form a second impregnated cloth. Then, the second impregnated cloth is dried at a temperature of 170°C for 90 seconds and heated at 245 Bake at a temperature of ℃ for 60 seconds to obtain a dipped polyester cord. Wherein, the second treatment liquid contains 390.0 g of butadiene pyridine latex (manufacturer is Croslene Chemical Industries. Ltd., solid content is 41%) and 610 g of deionized water, and is referred to as adhesive latex A in Table 4 for short.

[Application Example 2] Polyester base fabric and dipped polyester cord fabric In Application Example 2, except that the first treatment liquid was not used in the manufacture of dipped polyester cord fabric, the rest of the process conditions were the same as in Application Example 1.

[Application example 3] In application example 3 of polyester base fabric and dipped polyester cord fabric, except that the first treatment liquid is not used when manufacturing the dipped polyester cord, and a different second treatment liquid is used, the rest of the process conditions are used Performed under the same conditions as in Application Example 1. Wherein, the total amount of the second treatment liquid is 1000 g, and contains 390.0 g of butadiene/vinylpyridine/styrene copolymer latex (the manufacturer is Zeon, the model is Nipol 2518FS, and the solid content is 40.5%), and 610 g of deionized water, and referred to as adhesive latex B in Table 4.

[Comparative Example 1] Polyester base fabric and dipped polyester cord fabric In Comparative Example 1, except that the polyester filament of Comparative Example 1 was used when manufacturing polyester base fabric, polyester base fabric and dipped polyester cord fabric were manufactured The conditions are the same as in Application Example 1.

[Comparative Example 2] Polyester base fabric and dipped polyester cord fabric In Comparative Example 2, except that the polyester filament of Comparative Example 1 was used to produce polyester base fabric, polyester base fabric and dipped polyester cord fabric were produced The conditions are the same as in Application Example 2.

[Comparative Example 3] Polyester base fabric and dipped polyester cord fabric In Comparative Example 3, the polyester filament of Comparative Example 1 was used to manufacture polyester base fabric and dipped polyester cord fabric. The conditions are the same as in Application Example 3.

[Property evaluation of dipped polyester cords] The dipped polyester cords of Application Examples 1 to 3 and Comparative Examples 1 to 3 were evaluated for the following properties, and the evaluation results are summarized in Table 4: 1. Peel test: according to standards Test method ASTM D4393 for testing.

[Table 4] Evaluation results of properties of dipped polyester cord

[Discussion of results in Table 4]

It can be seen from the results in Table 4 that, compared with Comparative Examples 1 to 3, Application Examples 1 to 3 use the polyester filaments of Example 2 to produce polyester base fabrics and dipped polyester cords, because the polyester of Example 2 The filament has a (2,4-dicarboxylic phenyl) ester group, so the polyester base fabric has a better bonding ability with the second treatment liquid containing a rubber adhesive, so that the dipped polyester cord and rubber The bonding ability is better. In addition, compared with Comparative Examples 2 and 3, Application Examples 2 and 3 have a (2,4-dicarboxyphenyl) ester group in the polyester filament of Example 2, so there is no need to use an isocyanate compound The first treatment liquid activates the polyester base fabric, which can also make the bonding ability of the polyester base fabric and the second treatment liquid containing the rubber adhesive better, and make the bonding ability of the dipped polyester cord and rubber better. good.

It is worth mentioning that, in the manufacturing process of the dipped polyester cord fabric of the present invention, because the polyester base fabric has the highly reactive (dicarboxylic acid phenyl) ester group, it is not necessary to use the first treatment liquid to activate The polyester base fabric can be directly treated with the second treatment liquid. In addition, even if the polyester base fabric is activated with the first treatment liquid, the first treatment liquid may not contain isocyanate compounds. Based on this, the environmental hazards and the health problems of operators caused by the use of isocyanate compounds can be avoided.

To sum up, the present invention uses the carboxyl phthalic anhydride to react with the polyester to obtain the modified polyester, so that the surface of the polyester filament composed of the modified polyester has the (dicarboxylic acid group) Phenyl) ester group and low oligomer content, and good bonding ability between polyester base fabric and rubber adhesive, and good bonding ability between dipped polyester cord fabric and rubber, so it can indeed achieve the purpose of the invention.

However, the above are only examples of the present invention, and should not be used to limit the scope of implementation of the present invention, any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification still belong to This invention covers the patent.

no.

Claims (9)

A polyester filament: is composed of a modified polyester, wherein the modified polyester contains at least one polyester segment, and at least one (dicarboxylic acid phenyl group) bonded to the polyester segment ) Ester group, and the intrinsic viscosity of the modified polyester ranges from 0.6 to 1.0 dL/g, and the total content range of the oligomers of the modified polyester is not more than 0.9 wt%, and the polyester filament has 30 To 70 meq/kg acid value range. The polyester filament as described in claim 1 has an intrinsic viscosity ranging from 0.6 to 1.0 dL/g. The polyester filament according to claim 1, wherein the (dicarboxyphenyl) ester group of the modified polyester is a (2,4-dicarboxyphenyl) ester group. The polyester filament according to claim 1, wherein the polyester segment of the modified polyester contains an alkyl phthalate unit. A polyester base fabric comprising a plurality of polyester filaments as described in claim 1. A dipped polyester cord fabric is prepared by a processing procedure, wherein the processing procedure includes the following steps: contacting a polyester base fabric as described in claim 5 with a processing component liquid to form dipped polyester The cord, wherein the treatment component liquid includes a second treatment liquid containing a rubber adhesive. The dipped polyester cord fabric according to claim 6, wherein the treatment component liquid further includes a first treatment liquid containing epoxy resin, and the polyester base fabric is brought into contact with the first treatment liquid to form an activated polyester Base cloth, and then contact the activated polyester base cloth with the second treatment liquid. A method for manufacturing polyester filaments, comprising the following steps: (1) Reacting polyester with carboxyl phthalic anhydride to obtain modified polyester. The modified polyester contains polyester segments and at least one (Dicarboxylic acid phenyl) ester groups bonded by polyester segments, and the intrinsic viscosity of the modified polyester ranges from 0.6 to 1.0 dL/g, and the total content range of the oligomers of the modified polyester Not more than 0.9 wt%; and (2) subjecting the modified polyester to a spinning process to obtain polyester filaments, wherein the acid value of the polyester filaments ranges from 30 to 70 meq/kg. The method for producing polyester filaments according to claim 8, wherein the amount of the carboxy phthalic anhydride ranges from 0.1 to 0.9 parts by weight based on 100 parts by weight of the total polyester.