Method of hydrophilizing materials
Coating compositions, methods and articles of manufacture comprising a nanoparticle system employing same to impart surface modifying benefits for all types of soft surfaces, and in some cases, hard surfaces, are disclosed. In some embodiments, dispersement of nanoparticles in a suitable carrier medium allows for the creation of coating compositions, methods and articles of manufacture that create multi-use benefits to the modified surfaces. These surface modifications can produce long lasting or semi-permanent multi-use benefits that, in some embodiments, may include at least one of the following improved surface properties: cleaning, wettability, liquid strike-through, comfort, stain resistance, soil removal, malodor control, modification of surface friction, reduced damage to abrasion and color enhancement, relative to the surfaces unmodified with such nanoparticle systems.
1. A method of rendering a material hydrophilic, said method comprising the steps of:
(a) providing a material comprised of hydrophobic or borderline hydrophilic components;
(b) increasing the surface energy of said material via an irradiation technique; and
(c) applying a plurality of nanoparticles to said material having an increased surface energy,
wherein the material having said nanoparticles applied is capable of absorbing bodily exudates and is hydrophilic.
2. The method of claim 1 wherein said material comprises a textile such as a nonwoven material comprised of hydrophobic or borderline hydrophilic structural components.
3. The method of claim 2 wherein at least some of the structural components of said material are at least partially comprised of a polyolefin.
4. The method of claim 3 wherein at least some of the structural components of said material are at least partially comprised of polyethylene.
5. The method of claim 3 wherein at least some of the structural components of said material are at least partially comprised of polypropylene.
6. The method of claim 1 wherein the step of increasing the surface energy of said material is performed by a treatment selected from the group consisting of corona discharge treatment; plasma treatment; UV radiation; ion beam treatment; electron beam treatment; laser treatment; and combinations thereof.
7. The method of claim 1 wherein said nanoparticles are selected from the group consisting of non-photoactive nanoparticles, photoactive nanoparticles, passified photoactive nanoparticles, and combinations thereof.
8. The method of claim 1 wherein after step (c), the surface of the treated material becomes hydrophilic having an advancing contact angle with water of less than 90° after 30 seconds of spreading.
9. The method of claim 1 wherein said material having said nanoparticles applied is used in an article that is selected from the group consisting of diapers, incontinence products, and catamenial products.
10. The method of claim 1 wherein said components are selected from the group consisting of topsheets, acquisition layers, distribution layers, wicking layers, storage layers, absorbent cores, absorbent core wraps, containment structures, and combinations thereof.
11. The method of claim 1 wherein the material with nanoparticles applied thereto is a nonwoven textile which exhibits a liquid strike-through time less than or equal to about 10 seconds after three 5 mL gushes of a test liquid according to a Strike Through Test.
12. The method of claim 1 wherein the material with nanoparticles applied thereto is a nonwoven textile which exhibits a liquid strike-through time less than or equal to about 6 seconds after three 5 mL gushes of a test liquid according to a Strike Through Test.
13. The method of claim 1 wherein the material with nanoparticles applied thereto is a nonwoven textile which exhibits a liquid strike-through time less than or equal to about 3 seconds after three 5 mL gushes of a test liquid according to a Strike Through Test.