A kind of modified carboxylated styrene-butadiene latex and preparation method thereof
A technology of carboxylated styrene-butadiene latex and carboxylated styrene-butadiene latex, which is applied in the field of polymers, can solve the problems of poor stability and large particle size of modified styrene-butadiene latex, and achieve the effects of small particle size, high bonding strength and excellent stability
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preparation example Construction
[0021] The preparation method of modified carboxylated styrene-butadiene latex provided by the invention comprises the following steps:
[0022] (1) In the presence of the initiator, the mixed system containing butadiene, styrene, acrylic acid, retarder, molecular weight regulator, water, pH buffer, chelating agent and emulsifier is sequentially heated at 55-60°C performing a first polymerization and a second polymerization at 65-75°C;
[0023] (2) The second polymerization reaction product is mixed with the oil phase containing nitrile functional monomer, styrene and butadiene and the water phase containing water, initiator, emulsifier and molecular weight regulator, and the resulting mixture The third polymerization reaction was carried out at 75-80°C and the fourth polymerization reaction was carried out at 85-90°C in sequence.
[0024] The present invention does not specifically limit the amount of each substance in the mixed system. Preferably, the amount of acrylic acid...
specific Embodiment approach
[0036] According to a specific embodiment of the present invention, the preparation method of the modified carboxylated styrene-butadiene latex comprises: (1) butadiene, styrene, acrylic acid, retarder, molecular weight regulator, water, pH buffering agent, Chelating agent and emulsifying agent are added in the reaction kettle, then start to stir, and each material is stirred evenly under the rotating speed of 100-200rmp, then pass into nitrogen, vacuum exhaust, replace air three times; (2) system temperature is raised to 55-60°C, and add the aqueous solution of the initiator, then maintain the reaction temperature at 55-60°C for 2-4 hours, then raise the temperature to 65-75°C for 3-6 hours; (3) to The oil phase containing nitrile-based functional monomers, styrene and butadiene and the water phase containing water, initiator, emulsifier and molecular weight regulator are continuously added dropwise in the above reaction kettle, and the temperature is raised to 75 React at -8...
Embodiment 1
[0046] This embodiment is used to illustrate the modified carboxylated styrene-butadiene latex provided by the present invention and its preparation method.
[0047] 560g butadiene, 320g styrene, 40g acrylic acid, 0.09g p-nitrochlorophthalic acid, 0.84g tertiary dodecyl mercaptan, 2100g deionized water, 0.92g sodium bicarbonate, 1.08g ethylenediaminetetra Potassium acetate, 24.4g dioctyl sodium succinate sulfonate and 46.3g 1,4-bis(1-methylheptyl) succinate sodium sulfonate were added to the reaction kettle, and the stirring was started at a speed of 120rmp. After stirring evenly, nitrogen was introduced, vacuum pumped, and the air was replaced 3 times. The temperature was raised to 57° C., 124 g of potassium persulfate aqueous solution with a concentration of 2% by weight was introduced to start the polymerization reaction, and the reaction temperature was maintained at 57° C. for 2 hours. Then the temperature was raised to 70° C. to continue the reaction for 3 hours. Subse...
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Abstract
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