Thermoplastic moisture-retaining coating material and preparation method thereof
A coating material and thermoplastic technology, applied in paper coating, coating, fiber raw material treatment, etc., can solve the problems of inability to have antibacterial and antibacterial functions, irregular flow and uneven distribution of thermoplastic materials, and achieve improved moisture resistance Limited water retention performance, maintaining stable suction quality, and increasing surface roughness
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Embodiment 1
[0033] Step 1: Coat the functional coating layer I on one side of the substrate for later use: Dissolve chitosan (degree of deacetylation>90%) with acetic acid, stir, disperse and dissolve in water until transparent, and add 1 mol / L NaOH solution after 1.5 hours. And to neutral, stop stirring and filter with a 200-mesh sieve to remove impurities in the chitosan solution. After static defoaming for 25min, a functional coating is obtained for later use; base material: 85g / m 2 Paper, coated with an air knife to obtain functional coating layer I after the paper is placed, and the coating amount is controlled at 1.50g m -2 , the coated paper enters the drying channel and is dried in the drying cylinder and then wound up for use.
[0034] In step 2, on the other side of the material described in step 2, the functional coating layer II is applied for later use: the PVDC is coated on the material described in step 1 by the reverse kiss coating method of the mesh roller, and the coatin...
Embodiment 2
[0038] Step 1, select the base material: 112g / m 2 For paper, apply the functional coating layer II to the substrate on one side for standby use: apply the PVDC to the substrate by reverse kiss coating with a mesh roller, the coating speed is controlled at 95m / min, and the coating weight of PVDC is 5.0g / m 2 , the drying temperature is 90 °C, the curing condition is 45 °C, and the surface is treated with a 350-mesh knurled plate during curing for 36 hours, and after increasing its roughness, it is cured for 12 hours;
[0039] Step 2, apply the functional coating layer I on both sides of the material described in step 1 for later use: add chitosan (degree of deacetylation>90%) with acetic acid, stir, disperse and dissolve in water until transparent, and use 1 mol / L after 1.75 hours. The NaOH solution was neutralized to neutrality, the stirring was stopped and the impurities in the chitosan solution were removed by filtration with a 200-mesh sieve, and the functional coating was...
Embodiment 3
[0043] see figure 1 As shown in step 1, select the base material: aluminized PE film with a thickness of 50 μ; apply a functional coating layer I on the front and back of the base material for later use: add chitosan (degree of deacetylation>90%) to acetic acid and stir Disperse and dissolve in water until transparent. After 1.5 hours, neutralize with 1mol / L NaOH solution to neutrality. Stop stirring and filter with 200 mesh screen to remove impurities in chitosan solution. The knife is coated on the front and back of the substrate to obtain the functional coating layer I, and the coating amount is controlled at 1.75g m -2 , Coated aluminized PE film enters the drying channel, is dried in the dryer, and then wound up for use.
[0044] Step 2, on the front and back of the material described in step 1, coat the functional coating layer II for later use: use the screen roller reverse kiss coating method to coat the PVDC on the material described in step 1, and the coating spee...
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