Acrylate emulsion, waterproof acrylate re-dispersible latex powder prepared from same, and preparation method for latex powder
A technology of acrylate and latex powder, which is applied in the field of preparation of acrylate emulsion, water-resistant acrylate redispersible latex powder prepared therefrom, and the latex powder, which can solve the problem of decreased stability of emulsion polymerization, little actual effect and few products and other issues to achieve good stability and excellent water resistance
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[0050] Another aspect of the present invention provides the preparation method of acrylate latex powder, and it obtains by the spraying method that adopts rotary atomizer, and this method comprises the steps:
[0051] Spray drying the compositions shown in Table 2;
[0052] After the latex powder is formed, it is separated by a cyclone separator, and the powder is collected by a stainless steel storage tank at the outlet of the tower;
[0053] Filter to obtain latex powder with 200 order filter screens.
[0054] Spray drying can make the material dry and atomized in a short time (several seconds to 30 seconds), has a high heat utilization rate, and is easy to adjust or control the quality index of the product by changing the operating conditions. In addition, according to the process requirements, It is made into powder, hollow spherical or loose granular products without crushing, which simplifies the process flow, is easy to realize mechanization and automation, can also re...
Embodiment 1
[0060] 1. Preparation of acrylate core-shell polymer emulsion
[0061] table 3
[0062]
[0063]
[0064] Prepare according to the formula shown in table 3 through the following steps:
[0065] A, mix core layer monomer and shell layer monomer with respective initiator respectively by the formula in table 3, form uniform core layer monomer solution and shell layer monomer solution for subsequent use;
[0066] B, the octylphenol polyoxyethylene ether, dodecyl diphenyl ether sulfonate disodium and anhydrous NaHCO in the starting material 3 Add it into a four-neck flask with a thermometer, a stirring device, a balanced dropping funnel, and a condensing reflux tube, add the amount of deionized water described in Table 3 under stirring, and stir for 30 minutes;
[0067] C. Add 25 wt% of the nuclear layer monomer in the reaction flask, stir for 20 to 30 minutes, and disperse it evenly in the water phase; then heat up to 80°C and keep it warm for about 30 minutes until the r...
Embodiment 2
[0076] 1. Preparation of acrylate emulsion
[0077] The acrylate emulsion was prepared in the same manner as in Example 1, except that the acrylate emulsion was prepared according to the components shown in Table 5.
[0078] table 5
[0079]
[0080] 2. Preparation of redispersible latex powder
[0081] In addition to adding the components shown in Table 6 to the acrylate emulsion prepared under the above conditions (wherein the PVA polymerization degree is 800 and the alcoholysis degree is 98%), a reusable Disperse latex powder.
[0082] Table 6
[0083]
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