A sunscreen polyester fabric prepared by exhaustion method and a preparation method thereof

Abstract

This invention relates to a sun-protective polyester fabric prepared by the exhaustion method and its preparation method. The sun-protective polyester fabric of this invention can be obtained by the following method: First, isooctyl p-dimethylaminobenzoate is dissolved in dimethylformamide to obtain a dye solution; second, the polyester fabric is added to a dyeing machine containing the dye solution for dyeing; finally, it is washed and dried to obtain the sun-protective polyester fabric. The ultraviolet transmittance (T(UVA)%) of the sun-protective polyester fabric prepared by this invention is less than 5%, which meets national standards; after 10 washes, the sun-protective function of the fabric remains stable without significant weakening.

Description

Technical Field

[0001] This invention belongs to the field of fabric preparation technology, specifically relating to a sun-protective polyester fabric prepared by the exhaustion method and its preparation method. Background Technology

[0002] The skin is the body's first line of defense and its largest protective organ. Under normal circumstances, the skin can absorb a maximum of 20 kJ / m³ per day. 2 The safe level of ultraviolet radiation is approximately 40~200 kJ / m². 2 Ordinary clothing offers only about 50% protection against ultraviolet rays, far from meeting the required level. On the other hand, as people's living standards improve and their health awareness increases, more and more people enjoy outdoor activities such as hiking and urban cycling, leading to a growing demand for sun protection.

[0003] Therefore, in order to prevent adverse effects such as skin darkening, aging, and cancer, people often choose to wear sun-protective clothing with a large coverage area to block the sun's ultraviolet radiation when engaging in outdoor activities, in addition to using sunscreen and parasols.

[0004] There are three main ways to improve the UV protection performance of sun-protective clothing fabrics. The first is to directly use UV-protective fibers. The second is to perform finishing on the sun-protective clothing fabric, commonly using methods such as sol-gel method, plating, and sputtering. The third is to increase the density and thickness of the sun-protective clothing fabric and reduce its porosity, thereby reducing the UV transmittance. However, for lightweight knitted sun-protective clothing fabrics, this method is not as effective as the first two methods in terms of UV protection.

[0005] Currently, improving the sun protection efficacy of fabrics is a research hotspot; however, key technologies remain difficult to overcome or have shortcomings. Isooctyl p-dimethylaminobenzoate has the function of absorbing solar ultraviolet rays; however, its bonding force with polyester fabrics is weak, and the two have poor compatibility, making it difficult to apply to polyester fabrics. Its use in sun protection finishing of polyester fabrics is rarely reported. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the first objective of the present invention is to provide a sun-protective polyester fabric prepared by the exhaustion method, which has excellent sun protection effect.

[0007] The sun-protective polyester fabric of the present invention can be obtained by the following method: First, isooctyl p-dimethylaminobenzoate is dissolved in dimethylformamide to obtain a dye solution; second, the polyester fabric is added to a dyeing machine containing the dye solution for dyeing; finally, it is washed and dried to obtain the sun-protective polyester fabric.

[0008] The second objective of this invention is to provide a method for preparing a sun-protective polyester fabric using the exhaustion method, comprising the following steps:

[0009] (1) Preparation of dye solution: Dissolve isooctyl p-dimethylaminobenzoate in dimethylformamide to prepare dye solution.

[0010] Preferably, the ratio of isooctyl p-dimethylaminobenzoate to dimethylformamide is 1 g: (100-300) mL.

[0011] (2) Dyeing: Add the polyester fabric to a dyeing machine containing dye solution for dyeing. The dyeing time is controlled at 30-40 minutes and the dyeing temperature is controlled at 130-140℃.

[0012] (3) Washing: Wash the dyed fabric with water and dry it to obtain sun-protective polyester fabric.

[0013] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0014] (1) In this invention, isooctyl p-dimethylaminobenzoate has the function of absorbing solar ultraviolet rays; however, its binding force with polyester fabric is weak, and the two have poor compatibility, making it difficult to apply to polyester fabric. There are few reports on its use in sun protection finishing of polyester fabric. The applicant of this invention unexpectedly discovered that polyester fabric can adsorb isooctyl p-dimethylaminobenzoate under high temperature conditions, and after adsorption, it has excellent sun protection performance.

[0015] (2) The present invention prepares sun-protective polyester fabric by exhaustion method. The entire production process is simple, inexpensive, and has little environmental pollution. It has broad application prospects.

[0016] (3) The UV transmittance T(UVA)% of the sun-protective polyester fabric prepared by the present invention is less than 5%, which meets the national standard; after 10 washes, the sun protection function of the sun-protective polyester fabric is still very stable and has not been significantly weakened. Detailed Implementation

[0017] Example 1

[0018] A sun-protective polyester fabric prepared by the exhaustion method, the fabric being prepared using the following method:

[0019] (1) Preparation of dye solution: Dissolve 1g of isooctyl p-dimethylaminobenzoate in 200mL of dimethylformamide to prepare dye solution.

[0020] (2) Dyeing: Add the polyester fabric to a dyeing machine containing dye solution for dyeing. The dyeing time is controlled at 35 minutes and the dyeing temperature is controlled at 135℃.

[0021] (3) Washing: The dyed fabric is washed and dried to obtain sun-protective polyester fabric a.

[0022] Example 2

[0023] A sun-protective polyester fabric prepared by the exhaustion method, the fabric being prepared using the following method:

[0024] (1) Preparation of dye solution: Dissolve 1g of isooctyl p-dimethylaminobenzoate in 100mL of dimethylformamide to prepare dye solution.

[0025] (2) Dyeing: Add the polyester fabric to a dyeing machine containing dye solution for dyeing. The dyeing time is controlled at 30 minutes and the dyeing temperature is controlled at 130℃.

[0026] (3) Washing: Wash the dyed fabric with water and dry it to obtain sun-protective polyester fabric b.

[0027] Example 3

[0028] A sun-protective polyester fabric prepared by the exhaustion method, the fabric being prepared using the following method:

[0029] (1) Preparation of dye solution: Dissolve 1g of isooctyl p-dimethylaminobenzoate in 300mL of dimethylformamide to prepare dye solution.

[0030] (2) Dyeing: Add the polyester fabric to a dyeing machine containing dye solution for dyeing. The dyeing time is controlled at 40 minutes and the dyeing temperature is controlled at 140℃.

[0031] (3) Washing: The dyed fabric is washed and dried to obtain sun-protective polyester fabric c.

[0032] Comparative Example A

[0033] Compared with Example 1, in this Comparative Example A, the amount of p-dimethylaminobenzoate isooctyl ester was reduced, that is, "1g p-dimethylaminobenzoate isooctyl ester" in step (1) was replaced with "0.1g p-dimethylaminobenzoate isooctyl ester", and other preparation methods were carried out according to the preparation method of Example 1, and sunscreen polyester fabric d was obtained.

[0034] Comparative Example B

[0035] Compared with Example 1, in this Comparative Example B, the dyeing temperature was reduced, that is, the "dyeing temperature controlled at 135°C" in step (2) was adjusted to "dyeing temperature controlled at 85°C", and other preparation methods were carried out according to the preparation method of Example 1, and the sun-protective polyester fabric e was obtained.

[0036] Performance evaluation test:

[0037] Sunscreen polyester fabrics a, b, c, d, and e prepared according to the specific embodiments 1-3 and comparative examples A-B of this invention were selected. The sunscreen function of the fabrics was tested according to GB / T 17032-1997 "Test Method for Ultraviolet Transmittance of Fabrics". Ultraviolet transmittance T (%) was used as the evaluation index for sunscreen function. The definition of ultraviolet transmittance T (%) is: the ratio of ultraviolet radiation intensity with a sample to radiance without a sample. T was calculated as follows:

[0038] T = (I1 / I0) × 100%

[0039] Where: I0—ultraviolet radiation intensity without a sample; I1—ultraviolet radiation intensity with a sample.

[0040] The experimental instrument used was a Lambda 35 UV-Vis spectrometer. The sample preparation method was as follows: a dry, flat section of fabric at least 2 cm from the edge was taken and cut into 60mm × 60mm pieces. The experimental procedure was as follows: before testing, the instrument parameters were set as follows: the wavelength scanning range was set to 200~400nm, the scanning wavelength interval to 1nm, the testing speed to high speed, and the test option to transmittance T%; after setting the instrument parameters, the sample was placed in the instrument without the sample clamp to zero the instrument. When the T% displayed in the transmittance column was 100%, it indicated that the instrument was calibrated. Then, the sample to be tested was placed in the instrument. The test results are shown in Table 1 below:

[0041] Table 1

[0042]

[0043] Chinese national standards define textiles with a UVA transmittance (T(UVA)%) below 5% as "UV-protective products." Table 1 shows a comparison of the UV transmittance of sun-protective polyester fabrics (a, b, c, d, e) prepared in Examples 1-3 and Comparative Examples A-B. It can be seen that the T(UVA)% of the sun-protective polyester fabrics prepared in Examples 1-3 are all below 5%, meeting the national standard. Examples 1-3 are significantly superior to Comparative Examples A-B in terms of sun protection indicators. After 10 washes, the sun protection function of the polyester fabrics remains stable without significant weakening. Performance evaluation test results indicate that appropriate amounts of isooctyl p-dimethylaminobenzoate and appropriate dyeing temperatures have a significant impact on the sun protection function of polyester fabrics.

Claims

1. A method for preparing a sun-protective polyester fabric using the exhaustion method, characterized in that, The preparation method includes the following steps: (1) Preparation of dye solution: Dissolve isooctyl p-dimethylaminobenzoate in dimethylformamide to prepare dye solution; (2) Dyeing: Add the polyester fabric to a dyeing machine containing dye solution for dyeing. The dyeing time is controlled at 30-40 minutes and the dyeing temperature is controlled at 130-140℃. (3) Washing: Wash the dyed fabric with water and dry it to obtain sun-protective polyester fabric.

2. The method for preparing a sun-protective polyester fabric by the exhaustion method according to claim 1, characterized in that, The ratio of isooctyl p-dimethylaminobenzoate to dimethylformamide in step (1) is 1 g: (100-300) mL.

3. A sun-protective polyester fabric prepared by the exhaustion method, characterized in that, It is prepared by the method described in any one of claims 1 to 2.

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