Polymer cement waterproof paint crosslinking agent

Polymer cement waterproof paint crosslinking agent. Polymer cement waterproof coating is composed of polymer emulsion, powder (cement powder, calcium powder, etc.) and additive reasonable coordination, mixed evenly stirring, and the hydration reaction of inorganic powder and organic emulsion crosslinking cross-linking compound and into.

Polymer emulsion plays a decisive role in the properties of water resistance, elasticity and toughness of polymer cement waterproof coating. Only improving the quality of emulsion can improve the performance of polymer cement waterproof coating and meet the development demand of waterproof material industry.

With traditional VAE emulsion preparation of JS waterproof coating is usually the following deficiencies: liquid powder than large, elastic is not high, after long-term immersion coating apparent softening, strength degradation, uv resistance, weather resistance is poor, some products in two or three years obviously exposed roof harden, elongation decreased.

This research institute conducted by N - methylol acrylamide, organic siloxane, - 2 - hydroxypropyl acrylate as the crosslinking monomers on JS research on modification of emulsion, the JS emulsion coating water resistant performance is good, strong bonding force, high tensile strength, can meet the requirements of polymer cement waterproof coating, has a broad market prospect.

Test the main ingredients. Acrylate (BA), acrylic (AA), styrene (St); Emulsifier CO - 1220, emulsifier h-870, dispersant da-02; N-hydroxymethyl acrylamide (NMAM), organosiloxane a-171, sodium bicarbonate, ammonium persulphate, tert-butyl hydrogen peroxide, white block, and market products; Deionized water. All raw materials are industrial.

Test instrument: electric thermostatic water bath groove, precise increasing power mixer, thermostatic drying box, rotary viscosimeter, electro-optic analysis balance.

Emulsion polymerization process

Early emulsifying process: 1) monomers to deionized water, emulsifier and CO - 1220 all BA and AA, St, NMAM, A - 171, in sequence, stirring edge in pre emulsification device, pre emulsified 30 min after testing samples, when appears smooth milky liquid for pre emulsified fully.

2) to join base process: part of deionized water, emulsifier H - 870 and sodium bicarbonate, in turn, add to the reactor, growing to 80 ℃.

3) the main body reaction stages: temperature control in 80 ~ 85 ℃, at a constant speed synchronization add all pre emulsion and part of ammonium persulfate solution, always add time of 2.5 h; Then in 80 ~ 85 ℃ heat 1 h.




Chinese name: Diethyl toluene diamine(DETDA)

Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).


4) after eliminating stage: after the heat preservation, cooled to 65 ~ 75 ℃, adding tert-butyl hydrogen peroxide solution, 5 ~ 10 min after adding sodium formaldehyde sulfoxylate solution; Reduce to room temperature, adjust glue, filter material.

Determination of solid content. Take 2 g emulsion, in the 120 ℃ drying to constant weight, the quality of the record before and after drying emulsion polymer, calculation of solid content.

The measurement of viscosity. According to GB/t11175-2002, use ndda-1 rotary viscosimeter and choose the suitable rotor to determine the viscosity of the emulsion.

Water resistance measurement. Apply the lotion to the glass plate, and then become a transparent film after drying 48h at room temperature. Dip the glass and glue film together in the water and observe the changes of the film. After soaking the 48h, it is not white and the film is not wrinkly, and it is regarded as qualified.

Measurement of stretch: refer to JC/T894 "polymer cement waterproof paint".

The determination of freeze-thaw stability: 50 g emulsion placed in the middle of 100 ml glass, in (20 + 1) - 18 ℃ refrigerator frozen h, again under 23 ℃ melting 6 h, five consecutive circulation, emulsion demulsification, the freeze-thaw stability as qualified.

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Diethyl toluene diamine(DETDA)  http://www.yaruichem.com