Preparation method and application of polyester fiber fabric

Abstract

The invention discloses a preparation method and application of a polyester fiber fabric, the preparation method is combined with a polyester fiber padding process, an olefine acid-methyl acrylate prepolymer and a polyurethane coating adhesive are mixed to prepare an anti-condensation finishing liquid, the anti-condensation finishing liquid is impregnated with polyester fibers, and then the polyester fibers penetrate through the interior and the exterior of the polyester fibers to generate acrylic acid water-absorbent resin; the bonding strength of the acrylic water-absorbent resin and the polyester fiber is improved, and the content and distribution uniformity of the acrylic water-absorbent resin in the polyester fiber are improved; the acrylic acid water-absorbent resin can absorb moisture in the environment to form hydrogel, and the hydrogel saturated after water absorption has certain hydrostatic pressure resistance and does not continuously absorb water, so that the effect of preventing water through water (gel) is achieved, the problem that a traditional outdoor tent fabric is prone to moisture condensation in the low-temperature and high-humidity environment is effectively solved, the comfort of a user is improved, and the outdoor tent fabric is worthy of popularization and application. When the weather is clear, the hydrogel releases water, the pores are opened again, and the dynamic balance of waterproofness and ventilation is realized.

Description

Technical Field

[0001] This invention relates to a method for preparing outdoor tent fabric, and more particularly to a method for preparing a polyester fiber fabric with anti-condensation properties and its application. Background Technology

[0002] Outdoor tent fabrics are generally made of synthetic fiber filament fabric coated with polyurethane (PU) or polyacrylate (PA), which provides high hydrostatic pressure resistance (waterproofing). However, a drawback is that they do not prevent condensation inside the tent. When the environment is humid or during nighttime camping, the amount of moisture generated by the environment or human respiration is significant. This moisture condenses, accumulates on the top layer of the tent, and drips down, causing discomfort to the user. This problem is a major pain point in the current outdoor tent industry, and researchers have made many efforts and attempts to address it. Among these efforts, adding a highly absorbent material with water-absorbing and water-releasing properties to the PU coating is an effective way to solve this problem. Traditional absorbent resin materials are typically solid polymers, laminated with fabrics through coating or lamination. After absorbing water, the resin particles tend to agglomerate, causing localized coagulation and affecting material uniformity. Furthermore, the resin's adhesion to the fabric substrate decreases after swelling, impacting the tent's durability. Patent CN114293379A discloses a method for treating fabrics with absorbent resin using a padding process. This method directly prepares superabsorbent resin through solution polymerization and bonds it to the fabric during a padding and baking process, giving the fabric water-repellent and waterproof properties. However, this method suffers from the drawback of excessive resin usage leading to seepage. The problem of poor permeability arises when directly preparing superabsorbent resin. The resin has already cross-linked to form a three-dimensional network structure, which greatly restricts the movement of molecular chain segments. The finishing solution has high viscosity, and after padding the finishing process onto the fabric, the resin has poor permeability and is distributed on the fabric surface. After the resin absorbs water and swells to form a gel, the gel and fabric are clearly separated, and the peel strength between the resin and the fabric is low, which is not conducive to the durability of the material. In addition, in order to make the finished fabric have a water-repellent effect, the amount of resin loaded on the fabric is very high. After baking, the fabric is too hard, which greatly affects the flexibility of the material and is not conducive to its application as a tent material. Summary of the Invention

[0003] Purpose of the invention: The purpose of this invention is to prevent condensation problems in outdoor tent fabrics during use, which would cause discomfort to users, and to provide a method for preparing an anti-condensation polyester fiber fabric; another purpose of this invention is to provide the application of the above-mentioned polyester fiber fabric in outdoor tents.

[0004] Technical solution: The method for preparing polyester fiber fabric according to the present invention includes the following steps:

[0005] Synthesize acrylate-methyl acrylate prepolymer;

[0006] The above-mentioned acrylic-methyl acrylate prepolymer was mixed evenly with polyurethane coating adhesive to prepare an anti-condensation finishing liquid;

[0007] The polyester fiber fabric is impregnated with the above-mentioned anti-condensation finishing solution, and then rolled and baked to produce a polyester fiber fabric with anti-condensation properties.

[0008] Furthermore, this method first prepares a prepolymer of acrylic superabsorbent resin. Resin crosslinking typically occurs at high temperatures, while the polymerization temperature of small-molecule resin monomers is relatively low. By preparing the resin prepolymer first, the reaction can be carried out at a relatively lower reaction temperature, which effectively improves the controllability of the reaction, resulting in a more moderate monomer polymerization rate and a more uniform molecular weight of the polymer after polymerization, avoiding the "bursting polymerization" phenomenon caused by high temperatures. In addition, the core of superabsorbent resin is its three-dimensional network structure capable of absorbing water and swelling. Small-molecule resin monomers are difficult to polymerize into an effective network structure. Furthermore, already crosslinked resin polymers are poorly soluble in water and difficult to process. The resin prepolymer can dissolve and disperse in water (it is a linear long-chain macromolecule) and can be further crosslinked during baking, forming an effective network structure on the surface and between the polyester fibers. The finishing solution is prepared by mixing acrylic acid-methyl acrylate with PU adhesive. The composite of acrylic acid-methyl acrylate and polyurethane coating adhesive enhances the film-forming properties of the coating adhesive, effectively improving the hydrostatic pressure resistance and durability of polyester fabrics. The polyurethane coating adhesive also crosslinks the resin prepolymer to form a three-dimensional network structure, thus providing an anti-condensation effect. An appropriate ratio of acrylic acid-methyl acrylate prepolymer to polyurethane coating adhesive can produce a synergistic effect, improving the film-forming properties of the coating while simultaneously enhancing the hydrostatic pressure resistance and water absorption of the polyester fabric. The coating effect is achieved by combining the resin crosslinking process with the fabric-finishing solution composite process using an dip-pad-bake-cure process. The pre-prepared acrylic water-absorbing resin prepolymer is a linear polymer. Compared with the finished acrylic resin, the molecular chains are relatively independent, resulting in good fluidity, low viscosity, and good penetration after impregnation into the fabric. This allows for better mixing with the fabric, stronger adhesion, less peeling, less delamination, and better durability. Meanwhile, the acrylic resin ultimately polymerized in the fabric has the function of absorbing or releasing water: in a humid environment, after saturating with water, it generates a hydrostatic pressure-resistant effect to prevent further water absorption and condensation, thus achieving a "waterproofing with water (gel)" effect; in a dry environment, the water in the acrylic water-absorbing resin evaporates and the pores reopen, allowing for breathability, thereby achieving a dynamic balance between waterproofing and breathability. Moreover, because the acrylic water-absorbing resin permeates both the inside and outside of the fabric, a small amount is sufficient to achieve excellent waterproofing and breathability. Therefore, its small dosage has minimal impact on the flexibility of the tent material, which is beneficial for its practical application as an anti-condensation tent material.

[0009] Furthermore, in step (1), the acrylic monomer is first pre-neutralized with 10%–15% NaOH to achieve a neutralization degree of 40%–65%. After neutralization, the acrylic monomer generates sodium acrylate, which has a lower reactivity than free acrylic acid, thus effectively controlling the polymerization rate. However, a moderate degree of neutralization helps to form a more uniform and cross-linked network structure while controlling the polymerization rate. This network structure not only increases the bonding performance and uniformity with the polyester fiber fabric but also improves the water absorption ratio of the resin, thereby ensuring the waterproofness and breathability of the polyester fiber fabric surface. After neutralization, the acrylic monomer generates sodium acrylate, introducing sodium carboxylate (COONa) groups into the polymerized resin. When absorbing water, the sodium carboxylate groups dissociate into carboxylate anions (COO-) in water. The electrostatic repulsion between the anions causes the resin network structure to expand, allowing water to enter and thus giving the polymerized resin a certain water absorption capacity.

[0010] Furthermore, in step (1), the molar ratio of acrylic acid to methyl acrylate is 3:1 to 5:1. After neutralization and polymerization, the acrylic acid monomer imparts water absorption properties to the polyester fabric, achieving an anti-condensation effect in outdoor tent fabric applications. The methyl acrylate monomer gives the finishing liquid coating good film-forming properties, further effectively improving the durability of the polyester fabric. The combination of the two monomers has a good synergistic effect.

[0011] Furthermore, in step (1), the initiator is potassium persulfate, and the amount of potassium persulfate used is 0.6wt% to 0.8wt% of the acrylic monomer. Potassium persulfate has good water solubility, which ensures that the initiator is evenly distributed in water in aqueous polymerization systems, and that the polymerization is uniform. Its reaction rate is moderate and has mild and stable characteristics, which can effectively prevent the resin monomer from polymerizing too quickly, resulting in excessive resin viscosity and difficulty in impregnating the fabric. In addition, it also has good storage stability and the decomposition products are safe and environmentally friendly (mainly sulfate ions and water). Other initiators, such as azobisisobutyronitrile (AIBN), produce toxic substances from the decomposition of benzoyl peroxide and are not suitable for aqueous systems. Redox initiators (such as potassium persulfate-sodium bisulfite systems) can cause the polymerization to be too fast in the early stage of the reaction, making it difficult to control the uniform molecular weight distribution of the polymer products. Ammonium persulfate, which is also a persulfate-based substance, has much higher reactivity than potassium persulfate, which can also cause the reaction rate to be too fast and the polymer products to be uneven. Therefore, in summary, potassium persulfate is the best choice for aqueous polymerization systems.

[0012] Furthermore, step (1) adopts an aqueous phase reaction at a temperature of 70℃~80℃. The process is relatively simple, avoids the use of organic solvents, and reduces environmental pollution. At the same time, it has good compatibility with polyurethane coating adhesive and low viscosity, making it easier to impregnate into the polyester fiber. This improves the crosslinking property, as well as the uniformity and film-forming property on the polyester fiber, thereby improving the waterproof and anti-condensation performance and breathability of the polyester fiber.

[0013] Furthermore, in step (2), the mass ratio of acrylate-methyl acrylate prepolymer to polyurethane coating adhesive is 2%~3%. The composite of acrylate-methyl acrylate and polyurethane coating adhesive enhances the film-forming properties of the coating adhesive, effectively improving the hydrostatic pressure resistance and durability of the polyester fabric. The polyurethane coating adhesive also crosslinks the resin prepolymer to form a three-dimensional network structure, thus providing an anti-condensation effect. An appropriate ratio of acrylate-methyl acrylate prepolymer to polyurethane coating adhesive can produce a synergistic effect, improving the film-forming properties of the coating while simultaneously enhancing the hydrostatic pressure resistance and water absorption of the polyester fabric.

[0014] Furthermore, in step (3), the liquid retention rate when impregnating the polyester fiber fabric with the anti-condensation finishing liquid is 120%~150%. The liquid retention rate is adjusted by controlling the rolling process. Too low a liquid retention rate will prevent the finishing liquid from fully bonding with the polyester fabric, thus affecting its waterproof and anti-condensation performance. Too high a liquid retention rate will result in excessive finishing agent on the fabric, making the finished fabric rough and stiff, affecting its flexibility and breathability. An appropriate liquid retention rate allows the resin prepolymer and coating adhesive to fully penetrate between the polyester fabric fibers, allowing the finishing liquid and the polyester fabric to fully combine with the finishing liquid, thereby improving the fabric's durability and waterproof and anti-condensation performance.

[0015] Furthermore, after rolling in step (3), the material is first pre-baked at 100℃~130℃ for 3min~5min, and then baked at 150℃~190℃ for 1min~3min. Appropriate baking conditions can effectively control the crosslinking density of acrylic-acrylamide resin prepolymer and polyurethane coating adhesive, forming a uniform and sufficient three-dimensional resin network structure. This not only increases the bonding performance and uniformity between the finishing liquid and the polyester fiber fabric, ensuring that the polyester fabric has good flexibility and will not become stiff due to excessive crosslinking, but also improves the water absorption ratio of the resin, thereby ensuring the waterproofness and breathability of the polyester fiber fabric surface.

[0016] The present invention also provides the application of the above-mentioned polyester fiber fabric in outdoor tents.

[0017] Beneficial Effects: Compared with existing technologies, this invention has the following significant advantages: 1. During the polyester fiber impregnation process, the acrylic acid-methyl acrylate prepolymer and polyurethane coating adhesive are mixed to form an anti-condensation finishing liquid. After impregnation with the polyester fiber, the liquid penetrates through the fiber to generate acrylic water-absorbing resin, improving the bonding strength between the acrylic water-absorbing resin and the polyester fiber, as well as the content and uniformity of the acrylic water-absorbing resin in the polyester fiber; 2. The acrylic water-absorbing resin penetrating through the polyester fiber can absorb moisture from the environment to form a hydrogel. The hydrogel, after being saturated with water, has a certain hydrostatic pressure resistance and no longer absorbs water, thus playing the role of "waterproofing with water (gel)". This effectively alleviates the problem of condensation in traditional outdoor tent fabrics in low temperature and high humidity environments, improving user comfort. When the weather is sunny, the hydrogel releases moisture, and the pores reopen, achieving a dynamic balance between waterproofing and breathability; 3. The impregnation process replaces the traditional coating process, completing the cross-linking reaction while the fabric is shaped. This improves the efficient bonding of the acrylic water-absorbing resin, simplifies the production process, and reduces energy consumption and costs; 4. The use of water-based system processes and materials avoids the use of organic solvents, reducing environmental pollution. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the static contact angle test results of the polyester fiber fabric prepared in Example 4 of the present invention;

[0019] Figure 2 This is a schematic diagram of the thermal analysis test results of the polyester fiber fabric prepared in Example 4 of the present invention;

[0020] Figure 3 This is a schematic diagram showing the reusability test results of the polyester fiber fabric prepared in Example 4 of the present invention.

[0021] Figure 4 This is a schematic diagram showing the water-repellent performance test results of the polyester fiber fabric prepared in Example 4 of the present invention.

[0022] Figure 5 These are schematic diagrams showing the apparent water absorption ratio and hydrostatic pressure resistance test results of Examples 4-6 and Comparative Examples 1-4 of the present invention;

[0023] Figure 6 This is a schematic diagram showing the apparent water absorption ratio and hydrostatic pressure resistance test results of Examples 4 and 7-8 and Comparative Examples 5-6 of the present invention;

[0024] Figure 7 This is a schematic diagram showing the apparent water absorption ratio and hydrostatic pressure resistance test results of Embodiment 4 and Comparative Examples 9-12 of the present invention. Detailed Implementation

[0025] The technical solution of the present invention will be further described below with reference to specific embodiments. All reagents used are commercially available products.

[0026] A method for preparing a polyester fiber fabric includes the following steps:

[0027] (1) Synthesis of acrylic acid-methyl acrylate prepolymer;

[0028] (2) Mix the above acrylic-methyl acrylate prepolymer with polyurethane coating adhesive evenly to prepare an anti-condensation finishing liquid;

[0029] (3) The polyester fiber fabric is impregnated with the above-mentioned anti-condensation finishing liquid, rolled and baked to produce an anti-condensation polyester fiber fabric.

[0030] The reagents used in Examples 1-4 and the control of process parameters are detailed in Table 1.

[0031] Table 1 Experimental conditions for Examples 1-4

[0032]

[0033] Examples 5-6 and Comparative Examples 1-4

[0034] Unlike Example 4, the mixing ratios of the prepolymer and the polyurethane coating adhesive were 2.0%, 3.0%, 1%, 1.5%, 3.5%, and 4%, respectively.

[0035] Examples 7-8 and Comparative Examples 5-6

[0036] Unlike Example 4, the degrees of neutralization of acrylic acid were 40%, 50%, 35%, and 70%, respectively.

[0037] Comparative Example 7

[0038] Unlike Example 4, the polyester fiber fabric was made only by impregnation with polyurethane coating adhesive, rolling and baking.

[0039] Comparative Example 8

[0040] Unlike Example 4, the polyester fiber fabric is made by impregnation, rolling and baking with the anti-condensation finishing liquid prepared in steps (1)-(2).

[0041] Comparative Examples 9-12

[0042] Unlike Example 4, the initiators used in step (1) to synthesize the acrylate-methyl acrylate prepolymer were azobisisobutyronitrile (AIBN), benzoyl peroxide, potassium persulfate-sodium bisulfite, and ammonium persulfate, respectively.

[0043] Comparative Example 13

[0044] The fabrics in the existing technology can be compared with CN114293379A.

[0045] The polyester fiber fabrics prepared according to the above embodiments and comparative examples were subjected to relevant performance tests:

[0046] 1. Water absorption test: Cut a 5 cm × 5 cm fabric sample and weigh its dry weight. Measure 100 g of distilled water with a graduated cylinder and pour it into a beaker. Place the fabric sample in the beaker to absorb water for 30 min, then remove it and let it air dry for 5 min to remove excess water. Weigh its weight after water absorption again. The apparent water absorption ratio of the fabric can be calculated according to formula (1).

[0047] （1）

[0048] Where: W1——dry weight of the finished fabric, g;

[0049] W2 — Weight of the finished fabric after absorbing water, in grams;

[0050] Q app — Apparent water absorption ratio of the finished fabric, g / g.

[0051] 2. Hydrostatic pressure resistance test: The YGB25G-Ⅱ type fully automatic hydrostatic pressure tester was used to conduct the hydrostatic pressure resistance test on the soaked absorbent polyester fabric in accordance with the GB / T 4744-2013 standard.

[0052] 3. Thermal analysis: Thermogravimetric analysis was performed on the treated polyester fabric using a STA 449C simultaneous thermal analyzer. Pyrolysis experiments were conducted under a nitrogen atmosphere, with the temperature increasing from 20°C to 600°C at a rate of 10°C per minute, to investigate the thermal stability of the treated polyester fabric.

[0053] 4. Static contact angle test: 5 μL of deionized water is dropped onto the surface of the treated polyester fabric, the shape of the water droplet on the fabric surface is photographed, and the contact angle is calculated and measured using the Young-Laplace equation.

[0054] 5. Reusability test: Take a 5 cm × 5 cm sample of the finished fabric, weigh its dry weight, and place it in distilled water until saturated. Remove it, weigh it, and record the wet weight of the fabric. Place it in a 100 ℃ oven until the sample is completely dry. Repeat the above operation.

[0055] 6. Water retention performance test: After the durable absorbent polyester fabric sample is saturated with water, place it at room temperature to evaporate. Weigh the sample at regular intervals and calculate the water retention rate according to formula (2). Plot the water retention curve. In the water retention test, the ideal range is 30-50% water retention rate after 120 min, which can maintain a certain humidity buffer and avoid water retention.

[0056] （2）

[0057] Where: W1—dry weight of durable absorbent polyester fabric sample, g;

[0058] W2—Mass of the durable absorbent polyester fabric sample after water absorption, in g;

[0059] W3—Mass of the durable absorbent polyester fabric sample after evaporation under natural conditions, in grams;

[0060] R – Water retention rate, %.

[0061] The test results of hydrostatic pressure resistance and apparent water absorption ratio of the above embodiments and comparative examples are detailed in Table 2.

[0062] Table 2. Test results of hydrostatic pressure resistance, apparent water absorption ratio, and static contact angle for Examples 1-8.

[0063]

[0064] Analyzing Examples 1-8, the polyester fiber fabric prepared in Example 4 of this invention exhibits a hydrostatic pressure resistance of up to 6162 mmH2O and an apparent water absorption rate of 1.28 g / g. Its static contact angle is between 56 and 60 degrees, allowing it to retain sufficient hydrophilic groups (-COO-) to maintain condensate absorption capacity. Simultaneously, it prevents condensation caused by external liquid water penetration, thus ensuring the fabric meets both anti-condensation requirements and maintains high hydrostatic pressure resistance, resulting in the best hydrostatic pressure resistance and anti-condensation performance. This invention involves two stages: pre-baking and baking. The main function of the pre-baking stage is to dry the moisture in the finishing solution. This is to prevent the resin prepolymer molecules from migrating due to excessively high temperatures during the subsequent baking stage, which would affect the uniformity of the finishing process on the composite polyester fabric. The main purpose of the baking stage is to cross-link the resin prepolymer to form an effective three-dimensional network structure, thereby giving the polyester fabric a good anti-condensation effect.

[0065] like Figure 2The figure shows the thermal analysis test results of the anti-condensation polyester fabric for outdoor tents in Example 4. The figure shows a significant negative peak in the DTG curve near 300 °C. Decomposition at this temperature is related to the soft segments in the PU, which are typically composed of polyether or polyester glycol and have low thermal stability, readily decomposing in the 200-300 °C temperature range. Additionally, oligomers or unreacted monomers in the resin may also begin to decompose within this temperature range. Near 400 °C, another significant negative peak appears in the DTG curve, which is related to the decomposition of the hard segments in the PU and the polymer chains in the resin. Furthermore, the molecular chains of the polyester fabric also decompose within this range. The peak value of the DTC negative peak near 300 °C is lower than that near 400 °C, and this is shown on the TG image as the slope of the line segment near 300 °C being less than that near 400 °C. This indicates that the finishing agent, combining the resin prepolymer and the polyurethane coating adhesive with the polyester fabric, slows down the decomposition process of the polyester fabric, thus giving the finished absorbent polyester fabric a certain degree of thermal stability. This reflects, to some extent, the improved durability of the polyester fabric.

[0066] like Figure 3 The figure shows the reusability test results of the anti-condensation polyester fabric for outdoor tents in Example 4. With increasing usage, the hydrostatic pressure resistance and Q of the treated absorbent polyester fabric... app Relatively stable. After 10 uses, the treated absorbent polyester fabric can still maintain its initial properties after multiple uses, and has good reusability.

[0067] like Figure 4 The image shows the water retention test results of the anti-condensation polyester fabric for outdoor tents in Example 4. Within 120 minutes, moisture was rapidly released, and the water retention rate decreased rapidly. After 120 minutes, the rate of decrease in water retention rate slowed down, and the water retention rate eventually approached zero. It is evident that the treated polyester fabric has a low water retention rate, preventing moisture accumulation and condensation. Simultaneously, when the ambient humidity decreases, the fabric can quickly release moisture, reducing water retention and helping to maintain dryness and comfort inside the tent.

[0068] Table 3 shows the test results of hydrostatic pressure resistance, apparent water absorption ratio, and static contact angle for Examples 4-6 and Comparative Examples 1-4.

[0069]

[0070] like Figure 5Compared with Table 3, and comparing Examples 4-6 and Comparative Examples 1-4, with the increase of the amount of water-absorbing acrylic prepolymer, the hydrostatic pressure resistance and apparent water absorption ratio of the fabric first increased and then decreased. Example 4 showed the best hydrostatic pressure resistance and apparent water absorption ratio. The static contact angle of Examples 4-6 did not change much, but it was much smaller than that of Comparative Examples 1-4. With the increase of the amount of resin prepolymer, the number of crosslinking points increased and the degree of crosslinking improved, which was conducive to the formation of a three-dimensional network structure. This appropriately increased the compactness of the network, reduced the penetration channels of water molecules, and restricted the relative sliding of chain segments, thereby improving the hydrostatic pressure resistance and apparent water absorption ratio. However, when the amount of prepolymer exceeded 3.0%, the resin crosslinking became excessive, and the three-dimensional network structure became too dense, making the fabric too rigid and reducing its adaptability to water pressure. Therefore, the hydrostatic pressure resistance decreased and the apparent water absorption ratio decreased. The size of the static contact angle is related to the apparent water absorption ratio. As the water absorption ratio decreases, the fabric becomes less hydrophilic and the contact angle becomes larger.

[0071] Table 4. Results of hydrostatic pressure resistance, apparent water absorption ratio, and static contact angle tests for Examples 4, 7-8, and Comparative Examples 5-6.

[0072]

[0073] like Figure 6 As shown in Table 4, comparing Examples 4, 7-8, and Comparative Examples 5-6, the hydrostatic pressure resistance first increased and then decreased with increasing degree of neutralization of acrylic acid. Example 4 exhibited the best hydrostatic pressure resistance and apparent water absorption ratio. This is because, with increasing degree of neutralization, more -COOH groups are neutralized to -COO-, enhancing the electrostatic repulsion between ions, resulting in larger spaces between polymer chains, a more extended structure, and improved hydrostatic pressure resistance and water absorption. However, if the neutralization is too high, exceeding 45%, excessive anions will cause over-expansion, making the resin's three-dimensional network structure too loose, leading to decreased hydrostatic pressure resistance and water absorption, and an increased static contact angle.

[0074] Table 5. Test results of hydrostatic pressure resistance, apparent water absorption ratio, and static contact angle for Examples 4 and Comparative Examples 7-8 and 13.

[0075]

[0076] As shown in Table 5, comparing Example 4 with Comparative Examples 7, 8, and 13, Example 4 blends the resin prepolymer with a polyurethane coating adhesive to treat the polyester fabric. The resin imparts a good anti-condensation effect to the fabric, and after absorbing water and forming a gel, it has a water-repellent (gel-like) effect, further enhancing the hydrostatic pressure resistance of the polyurethane coating adhesive. The two finishing agents have a synergistic effect, maintaining the ability to absorb condensate while preventing external liquid water penetration and condensation, so that the fabric meets the anti-condensation requirements and maintains a high hydrostatic pressure resistance. In Comparative Example 7, the polyester fabric is directly treated with polyurethane material. The fabric has a certain hydrostatic pressure resistance, but the apparent water absorption ratio is extremely low, and it does not have an anti-condensation effect. Its static contact angle is 110.844°, and the polyester fabric exhibits water repellency. In Comparative Example 8, the material exhibits some hydrostatic pressure resistance, but its apparent water absorption ratio is excessively high, with a static contact angle of 27.656°. The polyester fabric's excessive hydrophilicity means that after absorbing water, the excessive moisture absorbed hinders timely water release, negatively impacting the comfort of the tent interior in practical outdoor applications. In Comparative Example 13, the water-blocking effect is achieved through the gel formed after the resin absorbs water on the fabric. This excessive focus on the apparent water absorption ratio results in an overly thick gel layer on the fabric surface, potentially causing the tent to collapse in practical outdoor applications. Furthermore, Comparative Example 13 directly laminates the cross-linked resin onto the fabric, meaning the resin finishing agent is only applied to the fabric surface. After water absorption, significant delamination between the gel and the fabric occurs, resulting in low resin peel strength. With prolonged use of this fabric, the resin easily peels off and slips off, negatively impacting the fabric's durability.

[0077] Table 6 shows the test results of hydrostatic pressure resistance, apparent water absorption ratio, and static contact angle for Examples 4 and Comparative Examples 9-12.

[0078]

[0079] like Figure 7As shown in Table 6, comparing Example 4 and Comparative Examples 9-12, Example 4, using potassium persulfate as the initiator, showed the best anti-condensation and hydrostatic pressure resistance in the polyester fabric. This is because potassium persulfate has good water solubility, ensuring uniform distribution of the initiator in the aqueous polymerization system, leading to uniform polymerization. Its moderate reaction rate and mild, stable characteristics effectively prevent the resin monomers from rapidly polymerizing, resulting in excessively high resin viscosity that makes it difficult to apply to the fabric. In Comparative Examples 9-12, the polyester fabrics exhibited poor hydrostatic pressure resistance and apparent water absorption ratio, and their static contact angles were all relatively large, indicating insufficient anti-condensation performance. This is because the initiators AIBN and benzoyl peroxide used in Comparative Examples 9-10 are unsuitable for aqueous polymerization systems. During resin monomer polymerization, the polymerization rate was low, resulting in fewer effective resin macromolecular segments. Consequently, the three-dimensional network structure of the resin was not fully cross-linked in subsequent preparations, affecting the fabric's hydrostatic pressure resistance and anti-condensation performance. In Comparative Examples 11-12, when potassium persulfate-sodium bisulfite and ammonium persulfate are used as initiators, the polymerization rate of the resin monomers is too fast, which can easily lead to explosive polymerization, the generation of many small molecule byproducts, and uneven molecular weight of resin macromolecular segments. This also results in an incomplete resin network structure in subsequent preparations, affecting the hydrostatic pressure resistance and anti-condensation performance of polyester fabrics.

Claims

1. A method for preparing a polyester fiber fabric, characterized in that, Includes the following steps: (1) Synthesis of acrylic acid-methyl acrylate prepolymer; (2) Mix the above acrylic-methyl acrylate prepolymer with polyurethane coating adhesive evenly to prepare an anti-condensation finishing liquid; (3) The polyester fiber fabric is impregnated with the above anti-condensation finishing liquid, and then rolled and baked to produce an anti-condensation polyester fiber fabric.

2. The method for preparing polyester fiber fabric according to claim 1, characterized in that, In step (1), the acrylic monomer is first pre-neutralized with 10% to 15% NaOH to achieve a neutralization degree of 40% to 65%.

3. The method for preparing polyester fiber fabric according to claim 2, characterized in that, In step (1), the molar ratio of acrylic acid to methyl acrylate is 3:1 to 5:

1.

4. The method for preparing polyester fiber fabric according to claim 2, characterized in that, The initiator in step (1) is potassium persulfate.

5. The method for preparing polyester fiber fabric according to claim 4, characterized in that, The amount of potassium persulfate used is 0.6 wt% to 0.8 wt% of the acrylic acid monomer.

6. The method for preparing polyester fiber fabric according to claim 2, characterized in that, The step (1) uses an aqueous phase reaction at a temperature of 70℃~80℃.

7. The method for preparing polyester fiber fabric according to claim 1, characterized in that, In step (2), the mass ratio of acrylic-methyl acrylate prepolymer to polyurethane coating adhesive is 2%~3%.

8. The method for preparing polyester fiber fabric according to claim 1, characterized in that, In step (3), when the polyester fiber fabric is impregnated with anti-condensation finishing liquid, the liquid retention rate is 120%~150%.

9. The method for preparing polyester fiber fabric according to claim 8, characterized in that, After rolling in step (3), the product is first pre-baked at 100℃~130℃ for 3min~5min, and then baked at 150℃~190℃ for 1min~3min.

10. The use of the polyester fiber fabric of claim 1 in an outdoor tent.

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