Abstract
Abstract Abrasive materials are classified as paper, nonwoven, or plastic-based multilayer structures, which are used for different kinds of surface finishing. Currently, the production of abrasive structures on textiles is carried out by spraying a slurry of binder and abrasive particles, e.g., Al2O3 or SiC, with subsequent drying and curing of the binder. The drawback of this production method is the poor runnability of the spraying process. Even small variations in the process parameters may lead to an uneven coating. Therefore, a novel coating approach was developed to produce abrasive structures with foam coating on textile substrates. The foam coating method, which is commonly used in the textile industry, has the potential to produce an even coating layer. The runnability and reliability of the foam coating process are good even with high solids. From a workplace safety perspective, another advantage of foam coating is that there are no airborne particles during the coating process. A polyamide woven cloth was foam coated with an aqueous slurry containing abrasive grains (SiC), a water-based UV-curable acrylate binder, and cellulose nanocrystals (CNCs) to adjust the slurry rheology. Stable abrasive-binder foams were generated from the slurries even at high solids of 50% using an anionic foaming agent. The cloth was foam coated and dried, and the resin was cured with a LED-UV lamp on a pilot scale. It was observed that without the addition of CNC the foam did not stay on the surface of the cloth after coating. CNC acts as a rheology modifier and co-binder, which prevent the foam from penetrating deeper into the pores of the cloth. CNC also acted as a dispersing agent: the slurry was effectively stabilized by the CNC to prevent sedimentation of the abrasive grains. An organic solvent-free composition was introduced by combining CNC with a water-based UV-resin.
Highlights
The foam coating process is an established technology for coating or finishing woven and nonwoven fabric webs
In pilot-scale coating trials, abrasive slurries at high solids of 50% were foamable, and the generated foams were very stable in the time range of the coating process
Uniform coating surfaces indicated that stable foam coating conditions were achievable and the turbidity measurements supported this conclusion
Summary
The foam coating process is an established technology for coating or finishing woven and nonwoven fabric webs. The main advantages of this process are (1) reduction of water, (2) reduction of chemical consumption, and (3) savings in energy costs [1]. In this process, the coating material, water, and a foaming agent are mixed with pressurized air using a foam generator. To achieve the desired coat weight, ten times or more thick foam layer is spread on the moving web than with dispersion coating. This makes it possible to apply a small amount of material evenly over the substrate. Based on the experimental work in pilot scale, the key requirement of foam coating is that the foamed material can be pumped to the applicator and a stable enough foam is applied on the substrate [2, 3]
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