Slightly alkaline water-soluble isolating membrane for pre-paving and wet-paving of waterproof coil and preparation method of membrane
A waterproof membrane, water-soluble technology, applied in the direction of coating, can solve the problems of poor water resistance and UV aging resistance, damage to the self-adhesive layer of the isolation film, inability to unwind or stick to the sole, etc., and achieve UV aging resistance. Good, improve the tolerance of construction time, good effect of ultraviolet aging
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[0044] Each raw material is weighed according to the above-mentioned mass ratio, and the above-mentioned preparation method comprises the following steps:
[0045] (1) Add weighed water into the reaction vessel, add a pH regulator to adjust the pH value to 9-12 or 2-4 during stirring, heat up to 60±5°C with stirring, and slowly add polyvinyl alcohol in turn during the stirring process When the viscous is reached, stir at 60±5°C until it is completely dissolved;
[0046] (2) Cool down to ≤40°C, add VAE emulsion during stirring, stir for 10 minutes, slowly add dispersing wetting agent and defoamer during stirring, after stirring for 10 minutes, slowly add pigment during stirring, and disperse at high speed for 30 minutes , add leveling agent and thickener in turn, stir for 20 minutes, filter and discharge the material, use spray or brush method to evenly apply on the surface of the self-adhesive layer of wet-laid waterproof membrane or pre-laid anti-adhesive waterproof membrane,...
Embodiment 1
[0048] 1. A weakly alkaline water-soluble isolation coating for pre-laying wet-laid waterproofing coils, in terms of mass fraction, comprising the following components: 50% of tap water, 15% of VAE emulsion (Celanese Celvolit CP 143), to viscous Agent 5% (isoelectric point is pH2~8), polyvinyl alcohol (Taiwan Changchun Chemical Industry BP-05) 8%, pigment (DuPont titanium dioxide R706) 5%, pigment (2000 mesh heavy calcium) 13%, disperse and wet Agent (Dow X-405) 0.3%, thickener (Rohm and Haas ASE-60) 0.1%, defoamer (BASF A10) 0.2%, leveling agent (Digao Tego245) 0.4% and pH regulator (ammonia solution with a mass fraction of 25%) 3%.
[0049] In this example, the VAE emulsion is CP 143 produced by Celanese in the United States, which contains Celvolit. Celvolit is a vinyl acetate-ethylene copolymer emulsion without plasticizer, which has strong wet viscosity, good initial tack and It has good shear resistance and is suitable for bonding various substrates.
[0050] 2. The p...
Embodiment 2
[0062] 1. A weakly alkaline water-soluble isolation coating for pre-laying wet-laid waterproof coils, comprising the following components in terms of mass fraction: 60% deionized water, 20% VAE emulsion (Guangwei 707H), and adhesive 3% (isoelectric point is pH3~8), polyvinyl alcohol (Japan Kuraray PVA-217) 3%, titanium dioxide (Dragon Python R972) 11%, dispersing wetting agent (TEGO Dispers 760W) 0.3%, Thickener (Dow TT-935) 0.1%, defoamer (BASF A10) 0.5%, leveling agent (Digao Tego245) 0.1%, pH regulator (40% - methylamine aqueous solution) 0.1% and pH adjustment Agent (mass fraction is 25% ammonia solution) 1.7%.
[0063] 2. The preparation method of the weak alkali water-soluble isolation coating used for pre-laying wet-laid waterproofing coils is the same as in Example 1.
[0064] 3. The forming method of the weak alkali water-soluble isolation film used for pre-laying and wet-laying waterproof rolls is the same as that of Example 1, except that the dry film thickness is ...
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