A kind of water-resistant redispersible latex powder and preparation method thereof
A redispersible latex powder and water-resistant technology, which is applied in the field of water-resistant redispersible latex powder and its preparation, can solve the problems of improving water resistance and poor water resistance, and achieve improved water resistance and heat resistance Excellent effect of improving redispersibility
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Embodiment 1
[0029] The preparation method of the water-resistant type redispersible latex powder of the present embodiment is as follows:
[0030] Step 1. Add a small amount of water into the dissolution tank, then add polyvinyl alcohol with a polymerization degree of 500 and an alcoholysis degree of 85%; pass water vapor into the dissolution tank and stir, and the water vapor will form a vortex in the dissolution tank to make the polyvinyl alcohol The vinyl alcohol is fully dissolved; after steaming and stirring for 1 hour, an aqueous solution of polyvinyl alcohol with a solid content of 12% is obtained.
[0031] Step 2, polyvinyl alcohol aqueous solution, polyvinyl acetate-ethylene copolymer emulsion (viscosity is 1500mPa.s, solid content is 45%), tertiary acid emulsion (viscosity is 2300mPa.s, solid content is 53%) by mass ratio 1 :2.5:2.5 After mixing, stir evenly to obtain a spray liquid.
[0032] Step 3. Spray-dry the spray liquid (the inlet temperature of the drying tower is 130°C...
Embodiment 2
[0041] The preparation method of the water-resistant type redispersible latex powder of the present embodiment is as follows:
[0042] Step 1. Add a small amount of water into the dissolution tank, then add polyvinyl alcohol with a polymerization degree of 500 and an alcoholysis degree of 88%; pass water vapor into the dissolution tank and stir, and the water vapor will form a vortex in the dissolution tank to make the polyvinyl alcohol The vinyl alcohol was fully dissolved; after steaming and stirring for 1 hour, an aqueous solution of polyvinyl alcohol with a solid content of 16% was obtained.
[0043] Step 2, polyvinyl alcohol aqueous solution and polyvinyl acetate-ethylene copolymer emulsion (viscosity is 950mPa.s, solid content is 43%), tertiary acid emulsion (viscosity is 3600mPa.s, solid content is 55%) by mass ratio 1 :2.5:2.5 After mixing, stir evenly to obtain a spray liquid.
[0044] Step 3. Spray-dry the spray liquid (the inlet temperature of the drying tower is 1...
Embodiment 3
[0053] The preparation method of the water-resistant type redispersible latex powder of the present embodiment is as follows:
[0054]Step 1. Add a small amount of water into the dissolution tank, then add polyvinyl alcohol with a polymerization degree of 1700 and an alcoholysis degree of 88%; pass water vapor into the dissolution tank and stir, and the water vapor will form a vortex in the dissolution tank to make the polyvinyl alcohol The vinyl alcohol was fully dissolved; after steaming and stirring for 1.2 hours, an aqueous solution of polyvinyl alcohol with a solid content of 16% was obtained.
[0055] Step 2, polyvinyl alcohol aqueous solution, polyvinyl acetate-ethylene copolymer emulsion (viscosity is 2300mPa.s, solid content is 48%), tertiary acid emulsion (viscosity is 3400mPa.s, solid content is 60%) by mass ratio 1 :2.5:2.5 After mixing, stir evenly to obtain a spray liquid.
[0056] Step 3. Spray-dry the spray liquid (the inlet temperature of the drying tower is ...
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