CN-121986196-A - Ultraviolet resistant fabric and treatment method

Abstract

An ultraviolet protective fabric and a method for preparing an ultraviolet protective fabric having ferulic acid and/or a ferulic acid derivative (e.g., ethyl ferulate) comprises immersing the fabric in an aqueous solution of ferulic acid and/or a ferulic acid derivative, removing the fabric from the aqueous solution, and drying the immersed fabric. The aqueous solution may optionally comprise one or more surfactants. Ferulic acid and/or ferulic acid derivatives can provide UVA protection, e.g., UVA transmittance of less than 5%, and can increase UPF, e.g., UPF of 50 or higher, including fabrics that may contain dyes, without changing the color of the fabric.

Inventors

• S. P. Uttam
• H.Zheng
• A. M. Ellefson

Assignees

• 克拉罗斯技术股份有限公司

Dates

Publication Date

20260505

Application Date

20241009

Priority Date

20231009

Claims (20)

1. 1. A method of treating a fabric to provide uv protection, the method comprising: soaking the fabric in an aqueous solution of ferulic acid and/or a ferulic acid derivative; removing the fabric from the aqueous solution, and Drying the soaked fabric.
2. 2. The method of claim 1, wherein the aqueous solution comprises ferulic acid and the temperature of the aqueous solution during the soaking step is between about 25 ℃ and about 90 ℃.
3. 3. The method of claim 2, wherein the temperature of the aqueous solution during the immersing step is between about 75 ℃ and about 90 ℃.
4. 4. The method of claim 1, wherein the aqueous solution comprises ethyl ferulate and the temperature of the aqueous solution during the soaking step is between about 25 ℃ to about 130 ℃.
5. 5. The method of claim 4, wherein the temperature of the aqueous solution during the immersing step is between about 100 ℃ and about 130 ℃.
6. 6. The method of claim 1, wherein the aqueous solution further comprises one or more surfactants, the one or more surfactants collectively having a hydrophilic-lipophilic balance (HLB) of between about 14 and about 20.
7. 7. The method of claim 1, wherein the aqueous solution comprises ferulic acid derivatives including sinapic acid, chlorogenic acid, caffeic acid, rosmarinic acid, p-coumaric acid, and/or ethylhexyl ferulate.
8. 8. The method of claim 1, wherein drying the soaked fabric comprises heating the soaked fabric at a temperature between about 80 ℃ and about 180 ℃.
9. 9. An ultraviolet protective fabric comprising a fabric having fibers with ferulic acid and/or a ferulic acid derivative absorbed by the fibers of the fabric, wherein the ultraviolet protective fabric has a UVA transmittance of less than 5%.
10. 10. The ultraviolet protective fabric according to claim 9, wherein the ultraviolet protective fabric is prepared by a process comprising the steps of: soaking the fabric in an aqueous solution of ferulic acid and/or a ferulic acid derivative; removing the fabric from the aqueous solution, and Drying the soaked fabric; Wherein the ultraviolet protective fabric has a UPF of about 50 or greater.
11. 11. The fabric of claim 10, wherein the aqueous solution comprises ferulic acid or ethyl ferulate and one or more surfactants having an HLB of between about 13 and about 20.
12. 12. The fabric of claim 10, wherein the aqueous solution further comprises a dye, and wherein the uv protective fabric has a color produced by the dye, wherein the color is unaffected by ferulic acid or a ferulic acid derivative.
13. 13. The fabric of claim 9, wherein the fabric has ferulic acid absorbed by fabric fibers.
14. 14. The fabric of claim 9, wherein the fabric has ethyl ferulate absorbed by fabric fibers.
15. 15. The fabric of claim 9, wherein the fabric comprises a polyester blend.
16. 16. The fabric of claim 9, wherein the fabric comprises a garment.
17. 17. The fabric according to claim 9, wherein the fabric has a color, and wherein the color is not changed by ferulic acid and/or a ferulic acid derivative absorbed by fabric fibers.
18. 18. A method of treating a fabric to provide uv protection, the method comprising: Immersing the fabric in an aqueous solution comprising ferulic acid and/or a ferulic acid derivative and one or more surfactants having an HLB of between about 10 and about 20 at a temperature of between about 25 ℃ and about 130 ℃ for about 5 minutes to about 30 minutes; removing the fabric from the aqueous solution, and The soaked fabric is dried at a temperature between about 80 ℃ and about 180 ℃.
19. 19. The method of claim 18, wherein the aqueous solution comprises ferulic acid, wherein the one or more surfactants have an HLB of between about 14 and about 20, and wherein the aqueous solution has a temperature of between about 75 ℃ and about 90 ℃.
20. 20. The method of claim 18, wherein the aqueous solution comprises ethyl ferulate, and wherein the temperature of the aqueous solution is between about 100 ℃ and about 130 ℃.

Description

Ultraviolet resistant fabric and treatment method Cross Reference to Related Applications The present application claims priority from U.S. provisional application 63/588,855 entitled "anti-uv fabric and treatment method" filed on 9, 10, 2023, the disclosure of which is incorporated herein by reference in its entirety. Background The hazards of solar ultraviolet radiation are well known. For example, skin cancer is considered the most common type of cancer worldwide. The occurrence of skin cancer is known to be closely related to uv radiation exposure. Ultraviolet radiation is defined as electromagnetic radiation having a wavelength in the range of 100-400 nm. It is arbitrarily divided into three regions, UVA (315-400 nm), UVB (280-315 nm) and UVC (100-280 nm). UVC and about 90% of UVB radiation is absorbed by atmospheric components such as ozone, water vapor, oxygen and carbon dioxide. However, UVA radiation is less affected by the atmosphere. Thus, the ultraviolet radiation reaching the earth's surface consists mainly of UVA and small amounts of UVB. Garments are considered one of the most effective sun protection methods. According to the recently implemented european regulations (european personal protective equipment regulations 2016/425), ultraviolet protection garments are considered as a first type of Personal Protective Equipment (PPE) and must be able to absorb or reflect most of the radiant energy of harmful wavelengths (i.e. in the UVB and UVA range). (cited (EU) 2016/425 regulation [ ec. Europa. EU ]). According to these regulations, the European standard for sun protection garments (EN 13758-1) states that the Ultraviolet Protection Factor (UPF) of ultraviolet protection garments must be greater than 40 (UPF40+), and UVA transmission below 5%. However, achieving such low UVA transmittance is difficult. Polyester and its blended fabrics become popular fabric choices for sun-proof clothing due to their inherent ability to absorb ultraviolet radiation. Garments made from these fabrics typically provide upf50+ protection, but their UVA radiation transmittance may still be above a minimum of 5%. Some methods of increasing the UPF rating of garments include reliance on fabric construction (knit or woven pattern, fabric density and cover factor), fabric chemistry (e.g., synthetic fibers that are inherently capable of absorbing UVB radiation, such as polyesters and blends of polyester fibers with other synthetic fibers, such as Spandex), and chemical additives or surface treatments, such as uv-absorbing dyes, finishes, optical brighteners, and the like. Most commercially available textile ultraviolet absorbing dyes and finishes are petroleum based synthetic aromatic compounds. These compounds are generally derivatives of benzotriazole, phenyltriazine, phenylsalicylate, benzophenone and diphenylamine oxalate. Most commercially available organic ultraviolet absorbers primarily absorb UVB radiation and therefore do not provide the desired level of protection nor meet new regulatory requirements. In addition to inadequate protection against UVA radiation, textile dyes and finishing products are also important sources of water pollution. Textile dyes and finishing products are estimated to cause about one fifth of the global water pollution. With the increasing demand for protection of natural resources and fresh water supplies, it is becoming more important to find sustainable alternatives. Drawings The following drawings are illustrative of embodiments and do not limit the scope of the invention. The drawings are not necessarily to scale and are intended to be used in conjunction with the following detailed description. Embodiments of the present invention will be described with reference to the drawings, wherein like numerals may refer to like elements. FIG. 1 is a graph of UPF versus cover factor for a plurality of fabric types; FIG. 2 is a chemical structure diagram of ferulic acid; FIG. 3 is a chemical structure diagram of cinnamic acid derivatives according to various embodiments; FIG. 4 is a graph of the ultraviolet absorption spectrum of ferulic acid in water; FIG. 5 is an ultraviolet absorption spectrum of tannic acid in water; FIG. 6 is a graph showing the ultraviolet absorption spectra of ferulic acid and tannic acid in water; FIG. 7 is a graph of ultraviolet absorption spectra of RAYOSAN C in water; FIG. 8 is a photograph of a 100% polyester swatch before and after treatment with tannic acid and ferulic acid; FIG. 9 is a photograph of 93% polyester/7% spandex cloth before and after treatment with tannic acid and ferulic acid; FIG. 10 is a photograph of a 100% cotton swatch before and after treatment with tannic acid and ferulic acid; FIG. 11 is a photograph of a 100% cotton swatch before and after treatment with Rayosan C and ferulic acid; FIG. 12 is a graph of diffuse transmission spectra collected from 100% cotton swatches before and after treatment with Rayosan C and ferulic acid; FIG. 13 i