How to choose UV-resistant UV finishing agent?
There are two main types of anti-UV finishing agents. One is to use physical technology to use reflection or scattering to reduce ultraviolet radiation to the human body; the other is to use chemical technology to absorb ultraviolet rays from the sun to reduce ultraviolet radiation. transmittance to achieve the purpose of shielding the radiation.
1. Reflective or scattering anti-UV finishing agent. Also known as inorganic anti-UV finishing agent. For example: titanium dioxide powder, ceramic powder, etc., use these highly reflective substances to finish the fabric to improve the reflection and scattering ability of the clothing against ultraviolet rays. Since this type of inorganic anti-UV finishing agent seriously affects the breathability and feel of the fabric, and the product is less usable, fabrics treated with this type of anti-UV finishing agent can be used on fabrics with low breathability requirements. Do not use the full amount. On work attire.
2. Absorption type anti-UV finishing agent. Also known as organic anti-UV finishing agent. This type of anti-UV finishing agent performs post-finishing on fabrics to improve the fabric’s ability to absorb ultraviolet rays. The most widely used anti-UV finishing agent on the market today is the absorption-type anti-UV finishing agent. There are four conditions for anti-UV finishing agents suitable for fabric applications:
1. The wavelength range for absorbing ultraviolet rays should be wide and the absorption coefficient should be large. It can fully absorb 280-400NM and the absorption is stable;
2. It has no complete catalytic effect on fabrics and does not affect the color, whiteness and dyeing fastness of the fabric;
3. The product is safe and non-toxic, has no irritating or other harmful odors, and has no allergic reaction to human skin;
4. Good compatibility with other chemicals and certain cleaning resistance;
5. Increase the UPF value of the fabric, which can be as high as 50+
3. How to choose anti-UV additives for fabrics
mainly through the shielding rate, the main testing standard for UPF value. Only when the UPF value reaches 30+ can it be called a product with anti-UV effect, and a value of 50+ is considered to have excellent effect. Therefore, when fabric manufacturers choose anti-UV products, it is best to understand the effect requirements of customers.
2. The anti-UV effect of fabric also depends on the fabric structure of the fabric. Compared with knitted fabrics with low density and woven fabrics with tight longitude and latitude, woven fabrics are easier to achieve better anti-UV effect.
3. The thickness of the fabric or the weight per square meter per square meter. Compared with the weight per square meter of thick fabrics and light fabrics, thick fabrics are easier to achieve better UV resistance.
4. The color of the fabric has a great influence on the anti-ultraviolet effect. Compared with dark-colored fabrics and light-colored fabrics, dark-colored fabrics are easier to achieve better UV resistance.
4. Finishing method with anti-UV effect.
1. PU coating method
Anti-UV powder can be mixed with PU coating glue and applied to the surface of the fabric.
2. Impregnation method
Use a good aqueous solution of anti-UV agent, and perform dipping-padding-drying treatment on the setting machine to obtain a good anti-UV effect.
3. Same bath method
Anti-UV agent can be bathed with dyes in order to obtain good anti-UV effect, resulting in a large waste of anti-UV agent.
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