Pre-coating film
A technology of pre-coating film and base film, which is applied to the pre-coating film of ultrafiltration water purification materials, pre-coating film with multi-layer gradient structure, and the field of microfiltration, which can solve the problem of poor thickness and uniformity of the filter film layer, thickness Problems such as large error ratio and different thickness of slurry layer can achieve the effect of improving product quality, increasing the authenticity rate and increasing the service life
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Embodiment 1
[0031] Embodiment 1: as figure 1 Shown, a kind of pre-coating film comprises base film 1, ultrafiltration layer 2, first water permeable support layer 3 and second water permeable support layer 4, and described base film 1, ultrafiltration layer 2, first water permeable support The layer 3 and the second water-permeable support layer 4 are stacked in sequence, the base film 1 is a plastic film; the ultrafiltration layer 2 is composed of a resin coating, and the resin coating 21 is evenly distributed with inorganic nanoparticles 22 , the first water-permeable support layer 3 is composed of a resin coating 31, and inorganic particles 32 are evenly distributed in the resin coating 31; the second water-permeable support layer 4 is composed of a resin coating 41, and the resin coating Inorganic particles 42 are uniformly distributed in layer 41 . The thicknesses of the ultrafiltration layer 2, the first water-permeable support layer 3 and the second water-permeable support layer 4...
Embodiment 2
[0049] Embodiment 2: as figure 2 as shown in figure 2 , a kind of precoating membrane, comprises base membrane 1, ultrafiltration layer 2, permeable support layer 3, described base membrane 1, ultrafiltration layer 2 and permeable support layer 3 are laminated in sequence, and described permeable support layer 3 It can be one layer, the base film 1 is a plastic film; the ultrafiltration layer 2 is composed of a resin coating 21, and inorganic nanoparticles 22 are uniformly distributed in the resin coating 21; the water-permeable support layer 3 consists of a resin coating 31 in which inorganic particles 32 are uniformly distributed. The thicknesses of the ultrafiltration layer 2 and the water-permeable support layer 3 are sequentially increased, that is, the thickness of the water-permeable support layer is thicker than the thickness of the ultrafiltration layer; the inorganic nanoparticles 22 in the ultrafiltration layer 2 Particle size, the particle size of the inorganic...
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