TW202340558A - Regenerated fiber - Google Patents

Abstract

A regenerated fiber is prepared from a material including original polyester pellets and regenerated polyester pellets. A ratio of an intrinsic viscosity of the regenerated polyester pellets to an intrinsic viscosity of the original polyester pellets is between 0.89 and 1.13.

Description

Regenerated fiber

The present disclosure relates to an environmentally friendly textile material, and in particular to a regenerated fiber.

In recent years, as the consumption of textiles has gradually increased, waste textiles have also increased significantly. In this regard, industry players have begun to develop fibers with high added value and high environmental protection by recycling waste textiles. However, the spinnability of regenerated fibers made from waste textiles is often seriously affected by the presence of dyes, impurities and other substances, resulting in defects in the quality or appearance of the subsequently produced regenerated textiles (for example, horizontal bar problem). Therefore, how to provide a regenerated fiber with both high environmental protection and good spinnability has become an important topic actively studied by textile manufacturers.

The present disclosure provides a regenerated fiber so that regenerated textiles produced therefrom can avoid the problem of stripes after being dyed.

According to some embodiments of the present disclosure, a regenerated fiber is prepared from a material including the following components: virgin polyester particles and recycled polyester particles. The ratio of the intrinsic viscosity of recycled polyester particles to the intrinsic viscosity of virgin polyester particles ranges from 0.89 to 1.13.

In some embodiments of the present disclosure, the weight ratio of the content of virgin polyester particles to the content of recycled polyester particles ranges from 1:1 to 8:2.

In some embodiments of the present disclosure, the weight average molecular weight of the polyester in the virgin polyester pellets is between 30,000g/mol and 40,000g/mol, and the weight average molecular weight of the polyester in the recycled polyester pellets is between 30,000g/mol and 48,000g/mol. between moles.

In some embodiments of the present disclosure, the weight average molecular weight of the polyester in the virgin polyester particles ranges from 30,000 to 40,000 g/mol, and the weight average molecular weight of the polyester in the recycled polyester particles ranges from 47,000 to 48,000 g/mol. between moles.

In some embodiments of the present disclosure, recycled polyester pellets are prepared from materials including the following components: recycled polyester and chain-extended polyester. The chain extended polyester includes 90 to 98 parts by weight of virgin polyester and 2 to 10 parts by weight of a chain extender.

In some embodiments of the present disclosure, the content of the recycled polyester is between 98 and 99 parts by weight, and the content of the chain-extended polyester is between 1 and 2 parts by weight.

In some embodiments of the present disclosure, the chain extender includes a structure shown in Formula (1): Formula (1), where n is a positive integer between 1 and 3, and m is a positive integer between 1 and 3.

In some embodiments of the present disclosure, the content of the chain extender is between 1000 ppm and 2000 ppm based on the total weight of the recycled polyester particles.

In some embodiments of the present disclosure, the chain extender includes a structure shown in formula (2): Formula (2).

In some embodiments of the present disclosure, the content of the chain extender is between 150 ppm and 500 ppm based on the total weight of the recycled polyester particles.

According to the above embodiments of the present disclosure, the regenerated fiber of the present disclosure is prepared from materials including virgin polyester particles and recycled polyester particles. By controlling the ratio (proportion) of the intrinsic viscosity of virgin polyester particles and the intrinsic viscosity of recycled polyester particles, recycled textiles made of recycled fibers can avoid horizontal striping problems after dyeing.

A plurality of implementation manners of the present disclosure will be disclosed below in figures. For the purpose of clear explanation, many practical details will be explained together in the following description. However, it should be understood that these practical details should not be used to limit the disclosure. That is to say, in some implementations of the disclosure, these practical details are not necessary and therefore should not be used to limit the disclosure.

In this disclosure, the structure of a polymer or group is sometimes represented by a skeleton formula. This representation can omit carbon atoms, hydrogen atoms, and carbon-hydrogen bonds. Of course, if atoms or atomic groups are clearly drawn in the structural formula, the one shown shall prevail.

The present disclosure provides a regenerated fiber prepared from materials including virgin polyester particles and recycled polyester particles. By controlling the ratio (proportion) of the intrinsic viscosity of virgin polyester particles and the intrinsic viscosity of regenerated polyester particles, regenerated textiles made of regenerated fibers can avoid horizontal streaking problems after dyeing.

The regenerated fiber of the present disclosure is prepared from materials including virgin polyester particles and recycled polyester particles, and the ratio of the intrinsic viscosity of the recycled polyester particles to the intrinsic viscosity of the virgin polyester particles is between 0.89 and 1.13. When the ratio of the intrinsic viscosity of the recycled polyester particles to the intrinsic viscosity of the virgin polyester particles falls within the above range, the recycled polyester particles and the virgin polyester particles can have similar physical properties (for example, heat resistance, spinnability, etc. ), so that the recycled polyester particles and virgin polyester particles have similar melt spinning stability. In this way, the regenerated fiber spun from regenerated polyester particles and virgin polyester particles can avoid the problem of horizontal stripes after being made into regenerated textiles and dyed. In some embodiments, the intrinsic viscosity of the virgin polyester particles can be, for example, 0.64, and the intrinsic viscosity of the recycled polyester particles can, for example, range from 0.57 to 0.72.

A method for measuring the intrinsic viscosity of the polyester particles disclosed in the present disclosure is further supplemented. The method of measuring the intrinsic viscosity of polyester particles includes steps S10 to S40. In step S10, 0.125g of polyester particles are placed in 25 ml of phenol-tetrachloroethane mixed solvent, and heated at a temperature of 120°C for about two hours until the polyester particles are completely dissolved. After cooling to form the solution to be tested. In step S20, pour the solution to be measured into the viscometer (model: dynamic viscosity tester SCHOTT CT52) and let it stand in a constant temperature water tank at 25±0.05°C for 20 minutes. Then measure the value of the solution from the upper scale to the lower scale in the viscometer. required time (T1). In step S30, take another 25 ml of phenol-tetrachloroethane mixed solvent and pour it into the viscometer (model: dynamic viscosity tester SCHOTT CT52) and let it stand in a constant temperature water tank at 25±0.05°C for 20 minutes, then measure its temperature in the viscometer. The time required from the upper scale to the lower scale (T2). In step S40, the ratio of time T1 to time T2 is calculated to obtain the relative viscosity (Relative Viscosity) of the polyester particles, and the intrinsic viscosity of the polyester particles is calculated using relevant formulas.

In some embodiments, the weight ratio of the content of virgin polyester particles to the content of recycled polyester particles can range from 1:1 to 8:2 to help make the recycled fiber have high environmental protection (for example, high The degree of recycling) and the material used to form the recycled fiber have high spinning processing stability. Specifically, when the weight ratio of the content of virgin polyester particles to the content of recycled polyester particles is less than 1:1 (for example, 4:6), the material used to form the regenerated fiber has a greater tendency during false twist processing. Broken fibers may occur; when the weight ratio of the content of virgin polyester particles to the content of recycled polyester particles is greater than 8:2 (for example, 9:1), it means that the content of recycled raw materials in the regenerated fiber is low, and it may be difficult to Meet the market’s expectations and requirements for environmentally friendly textiles. In a preferred embodiment, the weight ratio of the content of virgin polyester particles to the content of recycled polyester particles can be, for example, 7:3 to better balance the environmental friendliness of the regenerated fibers and the quality of the materials used to form the regenerated fibers. Stability of spinning process.

In some embodiments, the recycled polyester particles and the virgin polyester particles can have similar intrinsic viscosities by adjusting the weight average molecular weight of the polyester in the virgin polyester particles and the weight average molecular weight of the polyester in the recycled polyester particles. In some embodiments, the weight average molecular weight of the polyester in the virgin polyester pellets can range from 30,000 to 40,000 g/mol, and the weight average molecular weight of the polyester in the recycled polyester pellets can range from 30,000 to 48,000 g/mol. between. Specifically, when the weight average molecular weight of the polyester in the virgin polyester particles and the weight average molecular weight of the polyester in the recycled polyester particles each fall within the above range, it can help to make the intrinsic viscosity of the recycled polyester particles more effective than the virgin polyester particles. The ratio of intrinsic viscosity of polyester particles is close to 0.89 to 1.13, so that recycled polyester particles and virgin polyester particles have similar melt spinning stability. In other embodiments, recycled polyester pellets can be prepared through lower-cost solid-state polymerization, and in these embodiments, the weight average molecular weight of the polyester in the recycled polyester pellets can range from 47,000 g/mol to 48,000 g/mol. between moles. It is worth noting that compared to the embodiment without solid state polymerization, although the weight average molecular weight of the polyester in the recycled polyester particles formed through solid state polymerization is larger, it is different from the weight average molecular weight of the polyester in the virgin polyester particles. More, but it can still make the ratio of the intrinsic viscosity of recycled polyester particles to the intrinsic viscosity of virgin polyester particles fall in the range of 0.89 to 1.13, and because the process temperature of solid-state polymerization is low and the recovery can be improved compared to general polymerization The molecular weight of polyester can effectively save costs and has advantages in mass production.

In some embodiments, the temperature of the solid state polymerization can be between 200°C and 240°C, the time of the solid state polymerization can be between 6 hours and 10 hours, and the vacuum degree of the solid state polymerization can be between 0.1 Torr and 1 Torr, and The stirring speed of solid state polymerization can be between 50rpm and 70rpm. In some embodiments, the polyester in the virgin polyester pellets can be, for example, polyethylene terephthalate, and the polyester in the recycled polyester pellets can be, for example, polyethylene terephthalate, polyethylene terephthalate, or polyethylene terephthalate. Butylene terephthalate or combinations thereof.

The recycled polyester particles will be further explained. In some embodiments, recycled polyester pellets can be prepared from materials including recycled polyester and chain-extended polyester. Specifically, the recycled polyester and the chain-extended polyester can be subjected to a kneading and granulation process to form recycled polyester pellets, in which the temperature of the kneading and granulating can be between 260°C and 280°C, and the double-sided polyester used in the kneading and granulation is used. The screw speed can range from 200rpm to 260rpm. In some embodiments, the recycled polyester and the chain-extended polyester can each be prepared using solid state polymerization as described above. Recycled polyester can be configured to increase the weight proportion of recycled raw materials in recycled polyester pellets, so that the recycled fiber prepared from recycled polyester pellets has high environmental protection, while chain extended polyester can be configured to increase the proportion of recycled polyester pellets. The intrinsic viscosity makes recycled polyester particles have similar melt spinning stability to virgin polyester particles. Overall, in the recycled polyester pellets, the content of recycled polyester can range from 98 parts by weight to 99 parts by weight, and the content of chain-extended polyester can range from 1 part by weight to 2 parts by weight, so as to take into account the need for regeneration. Environmental protection of regenerated fibers prepared from polyester particles and melt spinning stability of regenerated polyester particles.

The recycled polyester in the recycled polyester particles will be further explained. In some embodiments, the recycled polyester may be, for example, polyethylene terephthalate. In some embodiments, the recycled polyester may, for example, be in the form of polyester pellets, thereby improving storage convenience. Specifically, recycled polyester can be prepared, for example, by screening, purifying, crushing, melting, kneading, modifying, granulating and other steps from waste fabrics or fibers. The chain-extended polyester in recycled polyester pellets will be further explained. In some embodiments, the chain extended polyester can be prepared from a material including 90 to 98 parts by weight of virgin polyester and 2 to 10 parts by weight of a chain extender, wherein the chain extender can be configured with Improve the cross-linking degree of virgin polyester so that the recycled polyester particles have appropriate intrinsic viscosity to facilitate melt spinning. Virgin polyester and chain extenders falling within the above content range can contribute to high melt spinning stability of the recycled polyester pellets and can reduce breakage of the materials used to form the recycled fibers during false twist processing. possibility. In some embodiments, the virgin polyester may be, for example, polyethylene terephthalate, polybutylene terephthalate, or combinations thereof. In some embodiments, the chain-extended polyester may, for example, be in the form of polyester pellets, thereby improving storage convenience. Specifically, virgin polyester and chain extender can be subjected to a kneading and granulation process to form chain-extended polyester granules.

In some embodiments, the chain extender includes a structure shown in Formula (1): Formula (1), where n is a positive integer between 1 and 3, and m is a positive integer between 1 and 3. When the chain extender includes the structure shown in the above formula (1), the content of the chain extender can be between 1000 ppm and 2000 ppm based on the total weight of the recycled polyester particles. In detail, if the above content is less than 1000ppm, it may cause the chain extended polyester to have limited ability to improve the cross-linking degree of virgin polyester; if the above content is greater than 2000ppm, it may cause the materials used to form regenerated fibers to be false-twisted. During this period, there is a greater chance of wire breakage. In other embodiments, the chain extender includes a structure represented by formula (2): Formula (2). When the chain extender includes the structure shown in the above formula (2), the content of the chain extender can be between 150 ppm and 500 ppm based on the total weight of the recycled polyester particles. In detail, if the above content is less than 150 ppm, it may cause the chain extended polyester to have limited ability to improve the cross-linking degree of virgin polyester; if the above content is greater than 500 ppm, it may cause the materials used to form regenerated fibers to be false-twisted. During this period, there is a greater chance of wire breakage. It is worth noting that compared with the chain extender containing the structure represented by formula (1), since the chain extender containing the structure represented by formula (2) has more functional groups that can react with native polyester, Therefore, when a chain extender containing a structure represented by formula (2) is used to prepare recycled polyester particles, a small amount of chain extender can achieve significant chain extension effects, which contributes to process convenience and cost savings.

It should be noted that the recycled polyester particles of the present disclosure can have good color performance, and therefore can avoid adverse effects on the dyeing process of fibers or fabrics made of recycled polyester particles, thereby providing a wide range of applications. In some embodiments, the L value of the recycled polyester particles in the L*a*b* color space can be greater than 80, and the b value can be less than 10, showing high whiteness and low yellowness. Based on this, the L value of the regenerated fiber of the present disclosure in the L*a*b* color space can be greater than 93, and the b value can be less than 3, showing that it has color controllability similar to that of virgin fiber. In addition, when the pressure rise test is performed on the recycled polyester particles of the present disclosure using a filter with a pore size of 40 μm, the recycled polyester particles of the present disclosure can have a pressure rise value of less than or equal to 10 bar/kg, indicating good spinnability. In addition, the regenerated fiber disclosed in the present disclosure can have a fiber strength greater than or equal to 3g/d, which is in line with industry standards.

In the following description, various evaluations will be conducted on the recycled polyester particles and recycled fibers of the present disclosure. It should be understood that the materials used, their amounts and proportions, processing details, processing procedures, etc. may be appropriately changed without exceeding the scope of this disclosure. Therefore, the present disclosure should not be interpreted restrictively by the embodiments described below. ＜Experimental Example 1: Intrinsic viscosity evaluation, color evaluation and filter evaluation of polyester pellets＞

In this experimental example, intrinsic viscosity evaluation, color evaluation and filter evaluation were performed on the virgin polyester particles of the comparative example and the recycled polyester particles of each example. The description and evaluation results of comparative examples and each embodiment are shown in Table 1. The polyester in the virgin polyester particles of Comparative Example 1 is polyethylene terephthalate, and the polyester in the recycled polyester particles of Examples 1 to 3 is polyethylene terephthalate, and the implementation The polyester in the recycled polyester particles of Example 4 includes polyethylene terephthalate and polybutylene terephthalate (based on the total weight of the recycled polyester particles, polybutylene terephthalate The ester content accounts for 1wt%, and the source of polybutylene terephthalate is virgin polyester in chain-extended polyester).

Table I chain extender Intrinsic viscosity assessment color evaluation Filter evaluation Kind content L value b value Comparative example 1 without without 0.64 84.5 1.0 pass through Example 1 Formula 1) 1000ppm 0.58 83.6 8.6 pass through Example 2 Formula 1) 2000ppm 0.60 83.4 8.3 pass through Example 3 Formula 1) 4000ppm 0.62 83.1 8.5 pass through Example 4 Formula (2) 200ppm 0.57 80.8 8.9 pass through Example 12 Formula 1) 1000ppm 0.72 82.0 9.2 pass through Note 1: The content of chain extender is based on the total weight of recycled polyester particles. Note 2: The filter evaluation pass represents that when the polyester granules are tested for pressure rise using a filter with a pore size of 40 μm, the polyester granules have a pressure rise value less than or equal to 10bar/kg. Note 3: The recycled polyester particles in Examples 1 to 4 are formed through non-solid state polymerization, while the recycled polyester particles in Example 12 are formed through solid state polymerization.

It can be seen from the results in Table 1 that when the content of chain extender increases, the intrinsic viscosity of recycled polyester particles will increase to approach the intrinsic viscosity of virgin polyester particles. In addition, the L value of the recycled polyester particles in each embodiment is greater than 80, and the b value is less than 10, indicating that it has good color performance and can avoid adverse effects on the subsequent dyeing process of the regenerated fiber or fabric. . In addition, the recycled polyester particles in each example can be evaluated through the filter, showing good spinnability. <Experimental Example 2: Evaluation of weight average molecular weight of polyester in polyester pellets>

In this experimental example, the weight average molecular weight of the polyester in the virgin polyester pellets of Comparative Example 1 and the polyester in the recycled polyester pellets of Examples 1 to 2 and 12 was evaluated. The evaluation results are shown in Table 2.

Table II weight average molecular weight Comparative example 1 34156 Example 1 33627 Example 2 47974 Example 12 47758

From the results in Table 2, it can be seen that the weight average molecular weight of the polyester in the recycled polyester particles of Examples 1 to 2 is very close to the weight average molecular weight of the polyester in the virgin polyester particles of Comparative Example 1. It can be seen that the addition of the chain extender It has a certain influence on the weight average molecular weight of polyester in polyester particles. On the other hand, the weight average molecular weight of the polyester in the recycled polyester pellets of Example 12 is similar to the weight average molecular weight of the polyester in the recycled polyester pellets of Example 2. It can be seen that the polyester in the recycled polyester pellets formed using solid state polymerization has a similar weight average molecular weight. The weight average molecular weight of the ester can still be very close to the weight average molecular weight of the polyester in the recycled polyester pellets formed without solid state polymerization, which can help to make the recycled polyester pellets more cost-effective. The ratio of the intrinsic viscosity to the intrinsic viscosity of the virgin polyester particles falls in the range of 0.89 to 1.13. <Experimental Example 3: Evaluation of spinnability, false twist processability and elongation variability of regenerated fiber>

In this experimental example, the virgin polyester particles of Comparative Example 1 were spun to form the virgin fibers of Comparative Example 2, and the recycled polyester particles of Examples 1 to 4 and 12 were combined with the virgin polyester of Comparative Example 1. The particles are spun to form the regenerated fibers of Examples 5 to 9 and 13. Next, the virgin fiber of Comparative Example 2 and the regenerated fiber of Examples 5 to 9 and 13 were evaluated for spinnability, false twist processability, and elongation variability. The description and evaluation results of comparative examples and each embodiment are shown in Table 3.

Table 3 Fiber composition and content fiber processing Elongation variability (%) virgin polyester pellets Recycled polyester pellets POY spinning processability DTY false twist processability Comparative example 2 Comparative example 1 100wt% - Processable Processable 1.65 Example 5 Comparative example 1 70wt% Example 1 30wt% Processable Processable 6.65 Example 6 Comparative example 1 70wt% Example 2 30wt% Processable Processable 5.50 Example 7 Comparative example 1 50wt% Example 2 50wt% Processable Processable 4.20 Example 8 Comparative example 1 70wt% Example 3 30wt% Processable Broken threads occur 6.78 Example 9 Comparative example 1 70wt% Example 4 30wt% Processable Processable 1.97 Example 13 Comparative example 1 70wt% Example 12 30wt% Processable Processable 2.76

It can be seen from the results in Table 3 that when the regenerated polyester particles of Example 3 are used to prepare regenerated fibers, the partially stretched yarn (Partially Oriented Yarn, POY) can be successfully obtained, but when the POY is subsequently false-twisted, breakage may occur. The yarn cannot be successfully formed into draw textured yarn (DTY). In addition, the regenerated fibers in each embodiment can have an elongation variability of less than 7%, indicating that each regenerated fiber can provide a fairly consistent elongation, so that regenerated textiles made of regenerated fibers can avoid the occurrence of Horizontal problem. It can be seen that although the regenerated fiber prepared using the regenerated polyester particles of Example 3 is difficult to process to form a stretch textured yarn, it still has a relatively small elongation variability, so the subsequently formed regenerated textile can be Avoid horizontal stripes after dyeing. <Experimental Example 4: Color evaluation and horizontal stripe evaluation of recycled textiles>

In this experimental example, the regenerated fibers of Examples 6, 9, and 13 were used to prepare the regenerated textiles of Examples 10, 11, and 14 respectively, and the regenerated textiles of Examples 10, 11, and 14 were color evaluated. Subsequently, the regenerated textiles of Examples 10, 11, and 14 were dyed, and the horizontal stripe evaluation was performed on the regenerated textiles after dyeing. The evaluation results are shown in Table 4.

Table 4 Color evaluation before dyeing Evaluation of bars after staining L value b value Example 10 93.8 1.9 No horizontal bars Example 11 93.7 1.9 No horizontal bars Example 14 93.2 2.4 No horizontal bars

It can be seen from the results in Table 4 that the regenerated textiles of Examples 10, 11, and 14 have no horizontal stripe problems, and the L value of the regenerated textiles in the L*a*b* color space before dyeing can be greater than 93, and the b value can be less than 3. It shows high whiteness and low yellowness, thus providing a wide range of dyeing applications.

According to the above embodiments of the present disclosure, the regenerated fiber of the present disclosure is prepared from materials including virgin polyester particles and recycled polyester particles. By controlling the ratio (proportion) of the intrinsic viscosity of virgin polyester particles and the intrinsic viscosity of recycled polyester particles, recycled textiles made of recycled fibers can avoid horizontal striping problems after dyeing.

Although the disclosure has been disclosed in the above embodiments, it is not intended to limit the disclosure. Anyone skilled in the art can make various changes and modifications without departing from the spirit and scope of the disclosure. Therefore, the protection of the disclosure The scope shall be determined by the appended patent application scope.

without

without

Domestic storage information (please note in order of storage institution, date and number) without Overseas storage information (please note in order of storage country, institution, date, and number) without

Claims (10)

A regenerated fiber prepared from materials including: Virgin polyester pellets; and Regenerated polyester particles, the ratio of the intrinsic viscosity of the recycled polyester particles to the intrinsic viscosity of the virgin polyester particles is between 0.89 and 1.13. The regenerated fiber according to claim 1, wherein the weight ratio of the content of the virgin polyester particles to the content of the regenerated polyester particles is between 1:1 and 8:2. The regenerated fiber according to claim 1, wherein the weight average molecular weight of the polyester in the virgin polyester particles is between 30000g/mol and 40000g/mol, and the weight average molecular weight of the polyester in the regenerated polyester particles is between Between 30000g/mol and 48000g/mol. The regenerated fiber according to claim 1, wherein the weight average molecular weight of the polyester in the virgin polyester particles is between 30000g/mol and 40000g/mol, and the weight average molecular weight of the polyester in the regenerated polyester particles is between Between 47000g/mol and 48000g/mol. The regenerated fiber according to claim 1, wherein the regenerated polyester particles are prepared from materials including the following components: Recycled polyester; and Chain extension polyester, the chain extension polyester includes 90 to 98 parts by weight of virgin polyester and 2 to 10 parts by weight of a chain extender. The regenerated fiber of claim 5, wherein the content of the regenerated polyester is between 98 and 99 parts by weight, and the content of the chain-extended polyester is between 1 and 2 parts by weight. The regenerated fiber according to claim 5, wherein the chain extender includes a structure shown in formula (1): Formula (1), where n is a positive integer between 1 and 3, and m is a positive integer between 1 and 3. The regenerated fiber according to claim 7, wherein the content of the chain extender is between 1000 ppm and 2000 ppm based on the total weight of the regenerated polyester particles. The regenerated fiber according to claim 5, wherein the chain extender includes a structure shown in formula (2): Formula (2). The regenerated fiber according to claim 9, wherein the content of the chain extender is between 150 ppm and 500 ppm based on the total weight of the regenerated polyester particles.