Polymer-Encapsulated Colorful Al Pigments with High NIR and UV Reflectance and Their Application in Textiles

Abstract

A polymer-encapsulated colorful Al pigment (PCAP) for fabric coatings was successfully prepared by a combined sol−gel spray drying assisted in situ polymerization method, and the near-infrared (NIR) reflectance and ultraviolet protection factor (UPF) of the coated fabrics were investigated. TG-DSC, SEM, and antisolvent test results proved that the reactive dyes were chemically attached to KH-550 modified Al pigment via a covalent bond. The PCAP was stable in strong alkaline (pH 12) or acidic (pH 1) conditions. The NIR reflectance and ultraviolet protection factor (UPF) of PCAP coated cotton fabrics were 80.05% and 290.76, respectively, when the mass ratio of monomer to colorful Al pigment was 1:10 with the coating thickness of 50 μm. PCAP coated fabrics showed excellent color strength, and good washing and rubbing fastness with a relatively good handle.

Phthalocyanine green aluminum pigment prepared by inorganic acid radical/radical polymerization for waterborne textile applications

“…UV rate; the greater the UPF, the better the UV protection. It can be seen from Table 2 that UPF improved from 85.56 to 220.38 as coating thickness increased from 0.02 to 0.06 mm indicating that UPF of polymer-encapsulated phthalocyanine green aluminum pigment-coated cotton fabrics had excellent UV protection irrespective of the coating thickness similar to the results obtained in our previous findings [34]; meanwhile, handle of coated fabrics appeared compromised as the coating thickness increased beyond 0.04. The excellent UPF of polymer-encapsulated phthalocyanine green aluminum pigment-coated cotton fabrics could be attributed to the metallic core and excellent hiding power of the colored/polymer matrix.…”

“…This phenomenon could be attributed to the decomposition of water, absolute ethanol, and the pigment on the surface of the aluminum pigment (metallic core) [12,33]. Polymer-encapsulated PGAP, however, recorded a much faster and higher rate of decomposition due to the reduced thermal stability of the encapsulated polymer at high temperature [34]. Color performance Table 1 shows the effect of polymer coatings (monomer mass by weight of PGAP) on the color performance of polymer-encapsulated PGAP-coated fabrics.…”

“…Regular and lengthy exposure to ultraviolet rays (UVA 400-320 nm, UVB 320-290 nm) can damage the immune system and cause skin diseases like erythema and skin burns, hence the need for UV protective clothing [34][35][36].…”

Preparation of melamine‐formaldehyde encapsulated fluorescent dye dispersion and its application to cotton fabric printing

“…Tawiah et al . obtained polymer‐encapsulated Al pigment by using a combined sol‐gel spray drying‐assisted in situ polymerisation method, and the coatings produced displayed excellent colour strength and fastness with a relatively good handle. Li et al .…”

Thiophene‐Fused‐Heteroaromatic Diones as Promising NIR Reflectors for Radiative Cooling

“…[4] Since 52 %o ft he solar energy reaching the surface of the earth is in the form of NIR radiation, which contributes to heat resulting from energy accumulation, it is desirable to develop appropriate NIR-reflective materials to avoid energy accumulation and reduce the energy consumption from temperature regulatory systems such as air conditioners. [6] Aside from their applications in heat management, NIR reflective materials have also been widely explored in the military, [7][8][9][10] in plastics, [11,12] and in the ink industry, [13,14] and thus further confirms the significance of conducting research in this field. [6] Aside from their applications in heat management, NIR reflective materials have also been widely explored in the military, [7][8][9][10] in plastics, [11,12] and in the ink industry, [13,14] and thus further confirms the significance of conducting research in this field.…”