A method for preparing lightweight polyester fabric for outdoor sportswear

Abstract

The invention relates to the technical field of fabric preparation, and discloses a method for preparing a lightweight polyester fabric for outdoor sportswear, comprising: wetting and modifying the polyester fabric, and then dipping it in an anti-ultraviolet finishing liquid for padding; drying the padded polyester fabric and placing it in a water-splashing resin liquid for calendering and finishing; the anti-ultraviolet finishing liquid used is prepared by the following process: dispersing sodium alginate, carboxymethyl chitosan, and an ultraviolet absorber in water and homogenizing to form a mixed liquid, dropping the mixed liquid into a calcium chloride solution to form an ultraviolet absorber coating liquid, and adding the padding resin dispersion stock solution to mix to obtain the anti-ultraviolet finishing liquid. The polyester fabric prepared by the invention has better anti-ultraviolet performance, high anti-ultraviolet ability and long durability, and at the same time, the polyester fabric maintains considerable air permeability, moisture permeability and water repellency, can meet the fabric requirements of outdoor sportswear, and has a good market prospect.

Description

Technical Field

[0001] The invention relates to the technical field of fabric preparation, and in particular to a method for preparing a lightweight polyester fabric for outdoor sportswear. Background Art

[0002] With the improvement of quality of life and the increase of work pressure, outdoor sports are becoming more and more popular. The demand for outdoor sportswear is also increasing. Long-term outdoor sports can cause the skin to darken due to ultraviolet rays, or even cause inflammation, so the fabrics of outdoor sportswear must have anti-ultraviolet function. In addition, outdoor sports generate a lot of heat and sweat evaporates a lot, so the fabrics of outdoor sportswear must have good air permeability and moisture permeability, and also have certain waterproof properties to cope with rainy and foggy weather.

[0003] In the prior art, a coating is often provided on the surface or inside of the fabric to provide UV resistance and waterproof ability. However, the existing UV resistance coating and waterproof coating are mostly used in the processing of tents, curtains, and umbrellas. The coating is thick, resulting in excessive mass per unit area of ​​the fabric, and poor air permeability, which does not meet the requirement that outdoor sportswear should be as light as possible. Chinese patent application CN104499290A discloses a fabric coating agent that gives the fabric moisture permeability and UV resistance. The coating is applied to the surface of the fabric to form an adhesive layer. The adhesive layer can give the fabric UV resistance and moisture permeability, and the UV resistance effect is relatively long-lasting, and it still maintains considerable UV resistance after multiple washings. However, after the adhesive layer is provided, the fabric almost loses its breathability, so this adhesive layer fabric is obviously not suitable for outdoor sportswear.

[0004] In addition to setting the coating, other methods such as finishing the fabric with an anti-ultraviolet functional solution are also a way to give the fabric anti-ultraviolet and other functions. Compared with the coating, it can maintain good air permeability and moisture permeability at the same time. However, there is still a problem of poor bonding between the finishing liquid and the fabric fiber. After multiple washings, the fabric's anti-ultraviolet ability is rapidly weakened, especially for polyester fabrics widely used in outdoor sportswear. The polyester molecular structure contains aromatic groups and has natural anti-ultraviolet ability, but the surface energy of polyester is low and it is difficult to be impregnated, and the anti-ultraviolet solution finishing effect is even worse. In the face of growing market demand, it is becoming increasingly important to develop clothing fabrics suitable for outdoor sports and give them functions such as lightweight, breathable, moisture permeable, durable anti-ultraviolet and waterproof. Summary of the invention

[0005] In view of the problems in the prior art that the anti-ultraviolet solution has poor bonding with the fabric and poor anti-ultraviolet ability, the purpose of the present invention is to provide a method for preparing a lightweight polyester fabric for outdoor sportswear, which can give the fabric a good and lasting anti-ultraviolet effect while avoiding the use of an anti-ultraviolet coating, thereby meeting the requirements of outdoor sportswear fabric for UV protection as well as breathability, moisture permeability, and water repellency.

[0006] The present invention provides the following technical solutions:

[0007] A method for preparing a lightweight polyester fabric for outdoor sportswear comprises the following steps:

[0008] (1) Wetting and modifying the polyester fabric, and then immersing and padding it in an anti-ultraviolet finishing liquid;

[0009] (2) drying the polyester fabric after padding in step (1) and placing it in a water-sprayed resin solution for calendering;

[0010] The anti-ultraviolet finishing liquid used in step (1) is prepared by the following process:

[0011] Sodium alginate, carboxymethyl chitosan and ultraviolet absorber are dispersed in water and homogenized to form a mixed solution, the mixed solution is added dropwise to a calcium chloride solution to form an ultraviolet absorber coating solution, and a padding resin dispersion stock solution is added and mixed to obtain an anti-ultraviolet finishing solution.

[0012] The coating layer inevitably leads to a serious loss of air permeability. In order to maintain good air permeability while resistant to ultraviolet rays, it is necessary to select an anti-ultraviolet finishing liquid from the anti-ultraviolet finishing liquid and the coating layer. When preparing the fabric of the present application, polyester fabric with good ultraviolet absorption performance is selected as the raw material, and polyester fabric is also a commonly used fabric for sportswear. In order to solve the problem of poor adhesion when polyester fabric is finished with an anti-ultraviolet solution, we start from both the polyester fabric and the anti-ultraviolet finishing liquid, and consider them in the same direction. On the one hand, the polyester fabric is wetted and modified to increase the dyeability of the polyester fabric. The wetting modification method can select conventional alkali reduction method, ammonia solution method, gamma ray irradiation, ultraviolet irradiation method, etc. For example, in the ultraviolet irradiation method, the polyester fabric is placed in an ultraviolet irradiation device under an inert atmosphere and irradiated with ultraviolet rays for 15 to 25 minutes, with an irradiation intensity of 0.8×10 -4 ~1.0×10 -4 µW / cm 2On the other hand, the improvement of the impregnation property of polyester fabric only by wetting and modifying is not large, and it is more suitable for macromolecular dyes, and has general adsorption to ultraviolet absorbers such as nano zinc oxide, titanium oxide, organic nickel complex, benzophenone, etc. Therefore, the ultraviolet absorber is placed in a composite gel structure formed by carboxymethyl chitosan and sodium alginate for coating treatment, and the affinity of carboxymethyl chitosan and the adsorption of sodium alginate gel microspheres are used to fix the ultraviolet absorber on the surface of polyester fiber, with high bonding force, long-lasting anti-ultraviolet performance of the fabric, and at the same time, air permeability and moisture permeability are maintained. Since water droplets are easy to spread after the polyester fabric is wet-modified, the waterproof performance is greatly reduced, so a water-repellent finishing is set. The water-repellent finishing makes up for the deficiency of the wetting modification of polyester fabric while meeting the conventional water-repellent performance of sports fabrics. In this way, the polyester fabric provided by the present application takes into account the anti-ultraviolet, moisture permeability, waterproof and breathable performance, and meets the demand for outdoor sportswear fabrics.

[0013] As a preferred embodiment of the method of the present invention,

[0014] In the mixed solution, the concentration of sodium alginate is 15-20 g / L, the concentration of carboxymethyl chitosan is 10-20 g / L, and the concentration of ultraviolet absorber dispersion is 7-13 g / L;

[0015] The concentration of calcium chloride solution is 10-15 g / L;

[0016] The volume ratio of calcium chloride solution to mixed solution is 1:1.2-1.5;

[0017] In the anti-ultraviolet finishing liquid, the dispersion concentration of the padding resin is 15-20 g / L.

[0018] As a preferred embodiment of the method of the present invention, the ultraviolet absorber is one or more of organic nickel complex, nano zinc oxide, and nano titanium oxide. Compared with benzotriazole and the like, it is less likely to cause color change of the fabric and has a higher anti-ultraviolet capability.

[0019] As a preferred embodiment of the method of the present invention, the wetting modification process of the polyester fabric is:

[0020] The polyester fabric was immersed in an organic solution containing 1-3 wt% benzophenone, and then placed in an ultraviolet irradiation device containing acrylic acid and inhibitor under an inert atmosphere for 15-25 min with an irradiation intensity of 0.8×10 -4 ~1.0×10 -4 µW / cm 2 Under ultraviolet radiation, free radicals are generated on the surface of polyester fabrics. Benzophenone acts as a photoinitiator to graft acrylic acid onto the fabric, introducing a large number of carboxyl groups onto the surface of the fabric, further improving wettability.

[0021] As a preferred embodiment of the method of the present invention, the carboxymethyl chitosan is O-carboxymethyl chitosan, which contains a large amount of amino groups and is more easily adsorbed onto polyester fabrics with carboxyl groups grafted on the surface.

[0022] As a preferred embodiment of the method of the present invention, the padding in step (1) is double padding and double padding, the bath ratio is 1:30-40, the roller pressure is 0.7-1.2 bar, the rolling speed is 1.5-2.5 m / min, and the padding temperature is 50-60° C. The roller pressure and speed of the press should not be too large to avoid a large number of ruptures and damages to the composite gel structure, thereby affecting the anti-ultraviolet effect.

[0023] As a preferred method of the present invention, the first padding is assisted by ultrasound, and the ultrasonic power density is 0.8-1.2 W / cm 2 The speed of the first padding is slower than that of the second padding, and the pressure of the first padding is greater than that of the second padding. Based on experience, in the first padding, ultrasonic assisted dispersion is used to improve the uniformity of the finishing liquid's adhesion. At the same time, the pressure of the first padding is as high as possible, 30% to 50% higher than that of the second padding, and the speed is as slow as possible, 20 to 30% slower than that of the second padding, so that the finishing liquid adheres to the fabric as much as possible. However, the pressure of the second padding is slightly smaller, and the speed is as fast as possible. While the finishing liquid is further adhered, some of the attached broken components are removed, and the composite gel structure is avoided from being destroyed while the finishing liquid is attached, thereby improving the product's UV resistance and air permeability.

[0024] As a preferred embodiment of the method of the present invention, the water-spraying resin liquid used in step (2) includes the following components: 20-30 g / L of padding resin, 15-20 g / L of fluorine-free water-spraying agent, 6-8 g / L of bridging agent, 10-15 g / L of penetrant, and 10-13 g / L of softener.

[0025] As a preferred embodiment of the method of the present invention, the calendering temperature is 80-90°C.

[0026] As a preferred embodiment of the method of the present invention, the padding resin is bisphenol A epoxy resin or polyvinyl acetate.

[0027] As a preferred embodiment of the method of the present invention, the polyester fabric is woven by satin weaving. Satin weaving has fewer interlacing times, relatively longer floating threads, high air permeability and moisture permeability, and is more suitable for the technical solution of composite gel adsorption.

[0028] The beneficial effects of the present invention are as follows:

[0029] The polyester fabric prepared by the preparation method of the present invention has good anti-ultraviolet performance, high anti-ultraviolet ability and long durability. At the same time, the polyester fabric maintains considerable air permeability, moisture permeability and water repellency, can meet the fabric requirements of outdoor sportswear, and has good market prospects. DETAILED DESCRIPTION

[0030] The specific implementation modes of the present invention are further described below.

[0031] Unless otherwise specified, the raw materials used in the present invention can be purchased from the market or are commonly used in the art. Unless otherwise specified, the methods in the following embodiments are all conventional methods in the art.

[0032] Example 1

[0033] A method for preparing a lightweight polyester fabric for outdoor sportswear, comprising the following steps:

[0034] (1) Satin-woven polyester fabric (30 cm × 30 cm) was placed in a UV irradiation device for 15 min for wettability modification. The irradiation intensity was 0.9 × 10 -4 µW / cm 2 , then immersed in anti-ultraviolet finishing liquid and finished by two-dip and two-roll process;

[0035] The anti-ultraviolet finishing liquid is prepared by the following process:

[0036] Sodium alginate, N,O-carboxymethyl chitosan and ultraviolet absorber are dispersed in deionized water and homogeneously mixed to form a mixed solution, wherein the concentration of sodium alginate is 15g / L, the concentration of carboxymethyl chitosan is 10g / L, the dispersed concentration of ultraviolet absorber is 10g / L, and the ultraviolet absorber used is a mixture of organic nickel complex (light stabilizer 2002) and nano zinc oxide, and the mass ratio of the two is 1.2:1. Then the mixed solution is added dropwise to a calcium chloride solution with a concentration of 12g / L through an injection pump for reaction, and the volume ratio of the calcium chloride solution to the mixed solution is 1:1.2. After the reaction, the mixture is allowed to stand for 4 hours to obtain an ultraviolet absorber coating solution, and then the dispersed stock solution of bisphenol A epoxy resin is added to the ultraviolet absorber coating solution and mixed evenly to form an anti-ultraviolet finishing solution, and the dispersed concentration of bisphenol A epoxy resin in the finishing solution is 15g / L;

[0037] The two-dipping and two-rolling process is as follows:

[0038] The bath ratio is 1:30, the padding temperature is 50, the roller pressure of the first padding is 0.7 bar, the rolling speed is 1.8 m / min, and the roller pressure of the second padding is 0.9 bar, the rolling speed is 2.5 m / min;

[0039] (2) drying the polyester fabric after padding in step (1) and placing it in a water-sprayed resin solution for metal calendering at 90°C;

[0040] The water-splashing resin liquid used includes the following ingredients: bisphenol A epoxy resin 1010 20g / L, fluorine-free water-splashing agent (Jiewei Chemical W-0301) 15g / L, bridging agent (Jiewei Chemical DN-7184) 6g / L, penetrant (fatty alcohol polyoxyethylene ether) 10g / L, softener (dioctadecyl dimethyl ammonium chloride) 10g / L.

[0041] Example 2

[0042] A method for preparing a lightweight polyester fabric for outdoor sportswear, comprising the following steps:

[0043] (1) Satin-woven polyester fabric (30 cm × 30 cm) was placed in a UV irradiation device for 15 min for wettability modification. The irradiation intensity was 0.8 × 10 -4 µW / cm 2 , then immersed in anti-ultraviolet finishing liquid and finished by double dipping and double padding process;

[0044] The anti-ultraviolet finishing liquid is prepared by the following process:

[0045] Sodium alginate, N,O-carboxymethyl chitosan and ultraviolet absorber are dispersed in deionized water and homogeneously mixed to form a mixed solution, wherein the concentration of sodium alginate is 20g / L, the concentration of carboxymethyl chitosan is 20g / L, the dispersed concentration of ultraviolet absorber is 13g / L, and the ultraviolet absorber used is a mixture of organic nickel complex (light stabilizer 2002) and nano zinc oxide, and the mass ratio of the two is 1.2:1. Then the mixed solution is added dropwise to a calcium chloride solution with a concentration of 15g / L through an injection pump for reaction, and the volume ratio of the calcium chloride solution to the mixed solution is 1:1.5. After the reaction, the mixture is allowed to stand for 4 hours to obtain an ultraviolet absorber coating solution, and then the dispersed stock solution of bisphenol A epoxy resin is added to the ultraviolet absorber coating solution and mixed evenly to form an anti-ultraviolet finishing solution, and the dispersed concentration of bisphenol A epoxy resin in the finishing solution is 20g / L;

[0046] The two-dipping and two-rolling process is as follows:

[0047] The bath ratio is 1:30, the padding temperature is 50, the roller pressure of the first padding is 0.7 bar, the rolling speed is 1.8 m / min, and the roller pressure of the second padding is 0.9 bar, the rolling speed is 2.5 m / min;

[0048] (2) drying the polyester fabric after padding in step (1) and placing it in a water-sprayed resin solution for metal calendering at 90°C;

[0049] The water-splashing resin liquid used includes the following ingredients: bisphenol A epoxy resin 1010 20g / L, fluorine-free water-splashing agent (Jiewei Chemical W-0301) 15g / L, bridging agent (Jiewei Chemical DN-7184) 6g / L, penetrant (fatty alcohol polyoxyethylene ether) 10g / L, softener (dioctadecyl dimethyl ammonium chloride) 10g / L.

[0050] Example 3

[0051] A method for preparing a lightweight polyester fabric for outdoor sportswear, comprising the following steps:

[0052] (1) Satin-woven polyester fabric (30 cm × 30 cm) was placed in a UV irradiation device for 15 min for wettability modification. The irradiation intensity was 1.0 × 10 -4 µW / cm 2 , then immersed in anti-ultraviolet finishing liquid and finished by double dipping and double padding process;

[0053] The anti-ultraviolet finishing liquid is prepared by the following process:

[0054] Sodium alginate, N,O-carboxymethyl chitosan and ultraviolet absorber are dispersed in deionized water and homogeneously mixed to form a mixed solution, wherein the concentration of sodium alginate is 18g / L, the concentration of carboxymethyl chitosan is 15g / L, the dispersed concentration of ultraviolet absorber is 10g / L, and the ultraviolet absorber used is a mixture of organic nickel complex (light stabilizer 2002) and nano zinc oxide, and the mass ratio of the two is 1.2:1. Then the mixed solution is added dropwise to a calcium chloride solution with a concentration of 13g / L through an injection pump for reaction, and the volume ratio of the calcium chloride solution to the mixed solution is 1:1.3. After the reaction, the mixture is allowed to stand for 4 hours to obtain an ultraviolet absorber coating solution, and then the dispersed stock solution of bisphenol A epoxy resin is added to the ultraviolet absorber coating solution and mixed evenly to form an anti-ultraviolet finishing solution, and the dispersed concentration of bisphenol A epoxy resin in the finishing solution is 17g / L;

[0055] The two-dipping and two-rolling process is as follows:

[0056] The bath ratio is 1:30, the padding temperature is 50, the roller pressure of the first padding is 0.7 bar, the rolling speed is 1.8 m / min, and the roller pressure of the second padding is 0.9 bar, the rolling speed is 2.5 m / min;

[0057] (2) drying the polyester fabric after padding in step (1) and placing it in a water-sprayed resin solution for metal calendering at 90°C;

[0058] The water-splashing resin liquid used includes the following ingredients: bisphenol A epoxy resin 1010 20g / L, fluorine-free water-splashing agent (Jiewei Chemical W-0301) 15g / L, bridging agent (Jiewei Chemical DN-7184) 6g / L, penetrant (fatty alcohol polyoxyethylene ether) 10g / L, softener (dioctadecyl dimethyl ammonium chloride) 10g / L.

[0059] Comparative Example 1

[0060] The difference from Example 1 is that the polyester fabric is not subjected to wet modification treatment, and the anti-ultraviolet finishing liquid is a mixture of N,O-carboxymethyl chitosan, ultraviolet absorber, bisphenol A epoxy resin 1010 and silane coupling agent KH560, the amount of each component is consistent with that in Example 1, and the amount of KH560 is 3 g / L.

[0061] Comparative Example 2

[0062] The difference from Example 1 is that the anti-ultraviolet finishing liquid is a mixture of N, O-carboxymethyl chitosan, ultraviolet absorber, bisphenol A epoxy resin 1010 and silane coupling agent KH560, the amount of each component is consistent with that in Example 1, and the amount of KH560 is 3 g / L.

[0063] Comparative Example 3

[0064] The difference from Example 1 is that the polyester fabric is not subjected to wet modification treatment.

[0065] Comparative Example 4

[0066] The difference from Example 1 is that carboxymethyl chitosan is omitted when preparing the anti-ultraviolet finishing liquid.

[0067] Comparative Example 5

[0068] The difference from Example 1 is that sodium alginate is omitted when preparing the anti-ultraviolet finishing liquid.

[0069] The polyester fabrics treated in the above Examples 1 to 3 and Comparative Examples 1 to 5 were tested for UV transmittance, UPF value, moisture permeability, air permeability and water repellency. The results are shown in Table 1.

[0070] The reference standard for UV protection test is: "GB / T 18830-2009 Evaluation of UV protection performance of textiles", the reference standard for moisture permeability test is "GB / T 12704.1-2009 Test method for moisture permeability of textile fabrics Part 1: Moisture absorption method", the breathability test is in accordance with the standard "GB / T 5453-1997 Determination of air permeability of textile fabrics", and the water-repellent performance is "GB / T4745-2012 Testing and evaluation of water repellency of textiles - Water absorption method".

[0071] Table 1 Performance of each fabric

[0072]

[0073] As can be seen from the above table, the initial UV protection performance of the fabric prepared by the present invention is higher than that of Comparative Example 1, which is because more UV protection components are attached to the fabric. At the same time, the UV protection durability of the fabric is also higher, and the UVA transmittance and UPF value after 30 washes change little, and are still within the requirements of UV protection products. At the same time, the air permeability of the fabric of the present application is slightly lower than that of Comparative Example 1, which may be due to the fact that some of the woven pores are easily blocked. In addition, due to the wetting modification and the hydrophilicity of carboxymethyl chitosan and sodium alginate, the wettability is slightly increased, the water-wetting grade is reduced, but the overall ventilation, moisture permeability, and water-proof performance are maintained. At the same time, from the comparison of Example 1 and Comparative Examples 2 to 5, it can be seen that only the surface of the polyester fiber is wetted, or only the UV protection coating gel is formed, and the coating gel lacks carboxyl chitosan or sodium alginate, and the UV resistance and durability are reduced, which shows the importance of the joint action of wetting, carboxymethyl chitosan and sodium alginate composite gel.

[0074] It should be noted that the silane coupling agent in Comparative Example 1 is a reinforcing component to enable the inorganic ultraviolet absorber to connect to the polyester. After adding the silane coupling agent, the anti-ultraviolet ability will be higher than that without the silane coupling agent.

[0075] Example 4

[0076] The difference from Example 1 is that the process of wetting modification of polyester fabric is as follows:

[0077] The polyester fabric was immersed in an acetone solution containing 1wt% benzophenone, and the acetone was evaporated after being taken out. The fabric was then sealed in a quartz tube containing an acrylic acid monomer solution and an inhibitor under an inert atmosphere, and then placed in an ultraviolet irradiation device for 20 minutes with an irradiation intensity of 0.9×10 -4 µW / cm 2 .

[0078] Example 5

[0079] The difference from Example 2 is that the carboxymethyl chitosan used is O-carboxymethyl chitosan.

[0080] Comparative Example 6

[0081] The difference from Example 1 is that the polyester fabric is immersed in an acetone solution containing 1wt% of benzophenone, taken out and sealed in a quartz tube containing an inhibitor under an inert atmosphere, and then placed in an ultraviolet irradiation device for 20 minutes with an irradiation intensity of 0.9×10 -4 µW / cm2 .

[0082] The anti-ultraviolet transmittance, UPF value, moisture permeability, ventilation and water repellency of the polyester fabrics treated in the above-mentioned Examples 4, 5 and Comparative Example 6 are shown in Table 2.

[0083] Table 2 Performance of each fabric

[0084]

[0085] As can be seen from the above table, the UV protection capabilities of Examples 4 and 5 are further improved relative to Example 1, especially in Example 5, O-carboxymethyl chitosan is used instead of N, O-carboxymethyl chitosan, and the durability is significantly improved. Compared with Example 1, since benzophenone can be used as an anti-ultraviolet agent, but most of it is decomposed under ultraviolet irradiation, the initial UV protection performance of Comparative Example 6 is improved, and the durability remains comparable to that of Example 1.

[0086] Example 6

[0087] The difference from Example 1 is that in step (1), during the second dipping and second rolling, ultrasound assistance is applied to the first dipping and rolling, and the ultrasound power density is 1.0 W / cm 2 The first padding speed was 1.8 m / min and the roller pressure was 1.2 bar.

[0088] Comparative Example 7

[0089] The difference from Example 1 is that in step (1), during the second dipping and second rolling, the first dipping and rolling speed is 1.8 m / min and the roller pressure is 1.2 bar.

[0090] Comparative Example 8

[0091] The difference from Example 1 is that in step (1), during the second dipping and second rolling, ultrasound assistance is applied to the first dipping and rolling, and the ultrasound power density is 1.0 W / cm 2 .

[0092] Comparative Example 9

[0093] The difference from Example 1 is that in step (1), during the second dipping and second rolling, ultrasonic assistance is applied during both the first and second layers, and the ultrasonic power density is 1.0 W / cm 2 .

[0094] The anti-ultraviolet transmittance, UPF value, moisture permeability, ventilation and water repellency of the polyester fabrics treated in the above-mentioned Example 6 and Comparative Examples 7 to 9 are shown in Table 3.

[0095] Table 3 Performance of each fabric

[0096]

[0097] As can be seen from Example 6 in the above table, by adjusting the pressure and speed changes in the padding process and introducing ultrasonic assistance, the fabric's UV resistance, durability and certain air permeability can be improved. Although the pressure and speed were adjusted in Comparative Example 7 as in Example 6, ultrasonic assistance was not introduced, and the results were equivalent to those in Example 1. Further, as in Comparative Example 8, ultrasound was introduced on the basis of Example 1 but the speed and pressure were not adjusted. The results were similar and there was no obvious improvement, which indicates that there should be a synergy between ultrasonic assistance and pressure and speed changes. Comparative Example 9 is slightly lower than Example 1, which may be due to the desorption of the already adsorbed material by secondary assisted ultrasound, indicating the importance of the timing of introducing ultrasound.

Claims

1. A method for preparing a lightweight polyester fabric for outdoor sportswear, characterized in that: The following steps are involved: (1) The polyester fabric is wet modified and then immersed in an anti-ultraviolet finishing liquid for padding; the wet modification process is as follows: the polyester fabric is immersed in an acetone solution containing 1 to 3 wt% of benzophenone, and then taken out and placed in an ultraviolet irradiation device containing acrylic acid and an inhibitor under an inert atmosphere for 15 to 25 minutes of ultraviolet irradiation with an irradiation intensity of 0.8×10 -4 ~1.0×10 -4 µW / cm 2 ; (2) drying the polyester fabric after padding in step (1) and placing it in a water-sprayed resin solution for calendering; The anti-ultraviolet finishing liquid used in step (1) is prepared by the following process: Sodium alginate, carboxymethyl chitosan and ultraviolet absorber are dispersed in water and homogenized to form a mixed solution, the mixed solution is added dropwise to a calcium chloride solution to form an ultraviolet absorber coating solution, and a padding resin dispersion stock solution is added and mixed to obtain an anti-ultraviolet finishing solution.

2. The preparation method according to claim 1, characterized in that: In the mixed solution, the concentration of sodium alginate is 15-20 g / L, the concentration of carboxymethyl chitosan is 10-20 g / L, and the concentration of ultraviolet absorber dispersion is 7-13 g / L; The concentration of calcium chloride solution is 10-15 g / L; The volume ratio of calcium chloride solution to mixed solution is 1:1.2-1.5; In the anti-ultraviolet finishing liquid, the dispersion concentration of the padding resin is 15-20 g / L.

3. The preparation method according to claim 1 or 2, characterized in that: The ultraviolet absorber is one or more of organic nickel complex, nano zinc oxide and nano titanium oxide.

4. The preparation method according to claim 1, characterized in that: The carboxymethyl chitosan is one of N, O-carboxymethyl chitosan and O-carboxymethyl chitosan.

5. The preparation method according to claim 1, characterized in that: The dipping and rolling in step (1) is two dipping and two rolling, the bath ratio is 1:30-40, the roller pressure is 0.7-1.2 bar, the rolling mill speed is 1.5-2.5 m / min, and the dipping and rolling temperature is 50-60°C.

6. The preparation method according to claim 5, characterized in that: The first padding was ultrasonically assisted, with an ultrasonic power density of 0.8-1.2 W / cm 2 The speed of the first dipping and rolling is slower than that of the second dipping and rolling, and the pressure of the first dipping and rolling is greater than that of the second dipping and rolling.

7. The preparation method according to claim 1, characterized in that: The water-splashing resin liquid used in step (2) includes the following components: 20-30 g / L of padding resin, 15-20 g / L of fluorine-free water-splashing agent, 6-8 g / L of bridging agent, 10-15 g / L of penetrant, and 10-13 g / L of softener.

8. The preparation method according to claim 1 or 7, characterized in that: The calendering temperature in step (2) is 80-90°C.

9. The preparation method according to claim 1 or 7, characterized in that: The padding resin is bisphenol A epoxy resin or polyvinyl acetate.

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