CN107574660B - Application of a UV Absorber in Fabric Finishing - Google Patents

Abstract

The invention discloses a kind of application of new ultra-violet absorbent in the arrangement of fabric UV resistance, belong to function additive technical field.Ultraviolet absorber is made into finishing fluid first and individually carries out UV resistance arrangement to cotton fabric by the present invention.Cotton fabric UV resistance effect after arrangement is preferable, fastness to washing is preferable, still can reach UPF > 40 washing 30 times or more, and UV resistance fabric other performance such as ultimate strength, elongation at break, recovering of folds angle have not significant impact.The present invention is also by ultraviolet absorber and nano-titanium dioxide composite finishing fabric, by the way that by the method for physical shielding and chemical absorbing combination, the UV resistance effect of the fabric after arrangement becomes more preferable.

Description

Application of a UV Absorber in Fabric Finishing

technical field

The invention relates to the application of an ultraviolet absorber in fabric finishing, and belongs to the technical field of functional auxiliary agents.

Background technique

Due to the environmental pollution caused by the development of industry and the discharge of a large number of Freon solvents, the ozone layer of the atmosphere has been continuously depleted and destroyed, and the ability to absorb ultraviolet radiation has been greatly weakened. multiple injuries. Facing more and more serious environmental problems, people began to pay attention to the protection of the environment, and also paid more attention to the protection of self-generation.

Cotton fabric is very popular because of its excellent wearing comfort, moisture absorption and breathability, and is a type of fabric with a large demand. It is easy to penetrate cotton fabrics, so it is particularly important to UV-proof cotton fabrics.

Ultraviolet absorbers can strongly and selectively absorb high-energy ultraviolet rays and release them in the form of other low-energy forms (light or heat with longer wavelengths), thereby avoiding the damage of ultraviolet rays to human skin. At present, the common UV absorbers in China are mainly salicylates, benzophenones, benzotriazoles, etc., but the salicylate finishing agents have low melting point, easy sublimation and low absorption coefficient, and the finished fabric is easy to Yellowing; benzophenones are expensive and sometimes easy to yellow; benzotriazoles absorb light at 300-400 nm, have low affinity for cotton fibers, are not easy to fix, spread easily, and have low washing fastness.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned problems of low washing fastness and yellowing, the present invention provides the application of an ultraviolet absorbent in the anti-ultraviolet finishing of cotton fabrics. Ultraviolet effect, after it absorbs ultraviolet rays and reaches the electronic excited state, it will be converted back to the ground state through ultra-fast photoisomerization, and effectively transmit the energy of ultraviolet rays to the environment. Anti-UV effect and wash resistance, but also effectively prevent the fabric from yellowing. At the same time, the present invention also provides a method for finishing fabrics with the ultraviolet absorber and nano-titanium dioxide composite coating material, and the fabrics finished by combining physical shielding and chemical ultraviolet absorption have better anti-ultraviolet effect.

The present invention provides a fabric finishing method using the UV absorber of formula (I).

Wherein, R _1,2 =OH, OCH ₃ or H, and R ₁ and R ₂ are the same or different.

In one embodiment, the fabric is a cotton fabric.

In one embodiment, the method is to prepare an ultraviolet absorber into a finishing solution, and then put the fabric into the finishing solution for a certain period of time, wash and dry the fabric.

In one embodiment, the amount of UV absorber is 10-40 g/L.

In one embodiment, the treatment time of the fabric in the finishing solution is 0.1-3h.

In one embodiment, the drying temperature of the finished fabric is 20-80°C.

In one embodiment, the method includes: when the finishing solution is heated to 40°C, the cotton fabric is wetted with water and put into the finishing solution, salt is added, the temperature is slowly raised to 90°C, the temperature is maintained for 60 minutes, the fabric is taken out, washed with water, drying. According to this method, the UV absorption effect was measured, and the UPF value was 65±5; meanwhile, the properties of the finished fabric were measured. (°) No obvious effect.

In another embodiment, the method is to make a composite coating material with an ultraviolet absorber and nano-titanium dioxide, and use the composite coating material to finish the fabric.

In one embodiment, the preparation of the composite coating material is as follows: ultrasonically dispersing nano-titanium dioxide in an aqueous solution of ultraviolet absorber, then adding it to the polyacrylate emulsion, mixing uniformly, and stirring at 70-80° C. for 5-10 hours to obtain An anti-ultraviolet type composite coating material; wherein, the mass ratio of nano titanium dioxide to polyacrylate emulsion is (0.15-0.40g): (20-30g).

In one embodiment, the ultrasonic dispersion power is 100-500W, and the time is 50-20min.

In one embodiment, the stirring speed at 70-80°C is 300-600 rpm.

In an embodiment, the use of composite finishing materials to finish the fabric is specifically: padding (30-100%)→drying (80-110°C, 3-10min)→baking (150-180°C, 1 -3min).

Beneficial effects of the present invention:

(1) In the present invention, the ultraviolet absorber of formula (1) is used to finish the fabric. The ultraviolet absorber has a fast response speed under illumination, and the finished fabric has a good ultraviolet protection effect and is not easy to yellow.

(2) The finishing method of the present invention has good washing fastness. According to the national standard GB/T18830-2009 textile anti-ultraviolet performance test, the anti-ultraviolet effect of the finished fabric is tested. The UPF of the finished fabric is greater than 50. After 30 washings, It can still reach UPF>40, which meets the requirements of anti-ultraviolet products.

(3) The present invention also utilizes the ultraviolet absorber of formula (1) and the nano-titanium dioxide composite coating material to finish the fabric, which has better anti-ultraviolet and anti-yellowing effects.

Description of drawings

Figure 1: Comparison of the effect of washing times on the UV protection effect of fabric samples after different finishing methods.

Figure 2: UPF comparison of fabrics treated with different concentrations of UV absorbers alone.

specific implementation

Soaping of finished fabrics: wash the finished fabrics according to GB/T8629-2001, the bath ratio is 1:30, the concentration of the lotion is 1.1g/L, washed at 30°C for 10 minutes, dehydrated and washed with water for 2 minutes, and dried. Dry, this process is one wash.

Anti-ultraviolet performance test: According to the national standard GB/T18830-2009 textile anti-ultraviolet performance test, use the textile ultraviolet protection factor tester (Cary50) to test the UPF value after different washing times.

Example 1: UV-resistant finishing of cotton fabrics by UV absorbers alone

The UV absorber of chemical formula (I) of 30g/L is dissolved in the finishing solution and heated to 40°C, the pre-wetted cotton fabric is put into the solution, the bath ratio is 1:20, and the salt of 3g/L is added simultaneously. , react for 30min, then heat up to 90℃, keep warm for 60min, take out the fabric, wash with water, and bake at 60℃ for 2h to obtain the finished fabric, and measure its UV absorption effect (UPF value is 65.8±5) and other properties (see Table 1). 2).

Table 1 UV absorber finishing prescription for cotton fabric alone

Table 2 Comparison of various properties of cotton fabrics before and after individual finishing

Example 2: Washing resistance test of cotton fabrics finished by UV absorber alone

The cotton fabric obtained by the anti-ultraviolet finishing in Example 1 was subjected to a washing durability test.

Specific experimental conditions: the bath ratio was 1:30, the concentration of the lotion was 1.1 g/L, washed at 30 °C for 10 min, dehydrated, washed with water for 2 min, dried, washed with water for 2 min, and dried. Then repeat the above operations for the fabric 5 times, and use a textile UV protection factor tester (Cary50) to test the UPF value of the fabric after 5 washings to 53.0±4.

Example 3: Washing resistance test of cotton fabrics finished by UV absorber alone

The cotton fabric obtained by the anti-ultraviolet finishing in Example 1 was subjected to a washing durability test.

Specific experimental conditions: the bath ratio was 1:30, the concentration of the lotion was 1.1 g/L, washed at 30 °C for 10 min, dehydrated, washed with water for 2 min, dried, washed with water for 2 min, and dried. Then repeat the above operations for the fabric 10 times, and use a textile UV protection factor tester (Cary50) to test the UPF value of the fabric after 10 washings to 51.2±5.

Example 4: Washing resistance test of cotton fabrics finished by UV absorber alone

The cotton fabric obtained by the anti-ultraviolet finishing in Example 1 was subjected to a washing durability test.

Specific experimental conditions: the bath ratio was 1:30, the concentration of the lotion was 1.1 g/L, washed at 30 °C for 10 min, dehydrated, washed with water for 2 min, dried, washed with water for 2 min, and dried. Then repeat the above operation for the fabric 20 times, and use a textile UV protection factor tester (Cary50) to test the UPF value of the fabric after 20 washings to 46.3±3.

Example 5: Washing durability test of cotton fabrics finished by UV absorber alone

The cotton fabric obtained by the anti-ultraviolet finishing in Example 1 was subjected to a washing durability test.

Specific experimental conditions: the bath ratio was 1:30, the concentration of the lotion was 1.1 g/L, washed at 30 °C for 10 min, dehydrated, washed with water for 2 min, dried, washed with water for 2 min, and dried. Then repeat the above operation for the fabric 30 times, and use a textile UV protection factor tester (Cary50) to test the UPF value of the fabric after 30 washings to 43.5±4.

Example 6: Washing resistance test of cotton fabrics finished with UV absorber alone

The cotton fabric obtained by the anti-ultraviolet finishing in Example 1 was subjected to a washing durability test.

Specific experimental conditions: the bath ratio was 1:30, the concentration of the lotion was 1.1 g/L, washed at 30 °C for 10 min, dehydrated, washed with water for 2 min, dried, washed with water for 2 min, and dried. Then repeat the above operations for the fabric 40 times, and use a textile UV protection factor tester (Cary50) to test the UPF value of the fabric after 40 washes of 42.2±2.

Example 7: Preparation test of UV absorber/nano-titanium dioxide composite coating

Ultrasonic disperse 0.2g nano titanium dioxide in 20mL 15g/L UV absorber solution of chemical formula (I), then add it to 20g polyacrylate emulsion, mix well and stir at 75°C and 450rpm for 8h, the obtained product is UV Absorber/nano-titanium dioxide composite coating. Among them, the power of ultrasonic dispersion is 250W, and the time is 20min.

Example 8: Finishing test of cotton fabric by composite coating material

Cotton fabric padding the composite coating material prepared in Example 7, the nip rate is 100%, then bake at 100 ℃ for 3 minutes, and finally bake at 170 ℃ for 1 minute, and naturally cool, and its UPF value is 68.6±4.

Example 9: Washing Test of Composite Finished Fabrics

The cotton fabric finished in Example 8 was subjected to a washing durability test.

Specific experimental conditions: the bath ratio was 1:30, the concentration of the lotion was 1.1 g/L, washed at 30 °C for 10 min, dehydrated, washed with water for 2 min, dried, washed with water for 2 min, and dried. Then repeat the above operations 5, 10, 20, 30, 40 times on the fabric, and the UPF values of the washed fabrics are 60.2±4, 58.7±5, 54.6±2, 52.7±5, 52.3±3, respectively.

Example 10: Fabric yellowing experiment under UV irradiation

The fabric samples after the UV absorber in Example 1 and the UV absorber/nano TiO ₂ composite in Example 8 were placed on the sample tray of UV-220 UV test box (German OSRAM UV bulb) (the distance between the bulb and the sample) The vertical distance of the tray is 35cm), the temperature is set to 40°C, and the whiteness is measured after irradiating for 36h. And compared with the change of whiteness before and after irradiation of fabrics that have not been treated with anti-ultraviolet finishing.

Table 3 Comparison of anti-yellowing ability of fabrics before and after finishing

Control 1: Nano- _TiO2 alone finishing fabric

Disperse 0.4g of nano-titanium dioxide ultrasonically in 20mL of deionized water, then add it to 20g of polyacrylate emulsion, mix evenly, and stir at 75°C and 450rpm for 8h, the nano-titanium dioxide finishing solution. Among them, the power of ultrasonic dispersion is 250W, and the time is 20min.

Pad-rolled fabric with a nip rate of 100%, then baked at 100 °C for 3 min, and finally at 170 °C for 1 min, and cooled naturally, the UPF value was determined to be 64.5±3, and washed according to the above washing method for 5, 10, 20, 30 , 40 times, the UPF values of the tested fabrics after washing were 54.3±4, 50.5±3, 47.2±4, 45.1±2, and 44.4±3, respectively.

Comparison 2: Comparison of the effects of different finishing methods

Control the consumption of ultraviolet absorber, adopt the method of embodiment 1, embodiment 8, contrast 1 to finish fabric respectively, the result is shown in table 4. The results show that by adopting the method of compound finishing, the dosage of each active ingredient is reduced by half, but a better effect is achieved.

Table 4 Comparison of anti-ultraviolet effects of different anti-ultraviolet finishing methods

Example 11: Different concentrations of UV absorber solutions individually finish fabrics

The ultraviolet absorber of chemical formula (I) of 10g/L, 20g/L, 40g/L is successively dissolved in the finishing solution and heated to 40 ° C, the pre-moistened cotton fabric is put into the solution, and the bath ratio is 1: 20. At the same time, add 3g/L of salt, react for 30min, then heat up to 90°C, keep the temperature for 60min, take out the fabric, wash with water, and bake at 60°C for 2h to obtain the finished fabric, and measure its ultraviolet absorption effect (UPF values are 56.2± 3, 63.4±4, 66.8±3) see Figure 2.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Anyone who is familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention should be defined by the claims.

Claims (10)

1. a fabric finishing method, is characterized in that, described method utilizes the ultraviolet absorber of chemical formula (I), Wherein, R _1,2 =OH, OCH ₃ or H, and R ₁ and R ₂ are the same or different. 2. The method according to claim 1, characterized in that, the method is to prepare an ultraviolet absorber into a finishing solution, and then the fabric is put into the finishing solution for a certain period of time, washed, and dried. 3. The method according to claim 1 or 2, wherein the fabric is a cotton fabric. 4. The method according to claim 2, wherein the concentration of the ultraviolet absorber in the finishing solution is 10-40 g/L. 5. The method according to claim 2, wherein the treatment time of the fabric in the finishing solution is 0.1-3h. 6 . The method according to claim 2 , wherein the drying temperature of the finished fabric is 20-80° C. 7 . 7. The method according to claim 2, wherein the method comprises: when the finishing liquid is heated to 40°C, the cotton fabric is wetted with water and put into the finishing liquid, salt is added, and the temperature is slowly raised to 90°C, Heat preservation for 60 minutes, take out the fabric, wash with water, and dry. 8 . The method according to claim 1 , wherein the method is to make a composite coating material with an ultraviolet absorber and nano-titanium dioxide, and use the composite coating material to finish the fabric. 9 . 9. method according to claim 8, is characterized in that, the preparation of described composite coating material: disperse nanometer titanium dioxide ultrasonically in ultraviolet absorber aqueous solution, then join in polyacrylate emulsion, after mixing evenly, at 70- Stir at 80° C. for 5-10 hours to obtain an anti-ultraviolet composite coating material; wherein, the mass ratio of nano titanium dioxide to polyacrylate emulsion is (0.15-0.40 g): (20-30 g). 10 . The method according to claim 8 , wherein the finishing the fabric with the composite coating material is specifically: padding at a nip rate of 30-100%, and then drying at 80-110° C. for 3-10 minutes, 10 . Then bake at 150-180℃ for 1-3min.