Chemical products show

White latex is a thermoplastic glue obtained by emulsion polymerization of vinyl acetate. Widely used in the bonding of wood processing, wood-based panels, cement mortar, paper, cloth, leather, ceramics and other industries. It is easy to use, strong in bonding and simple in production process. However, its viscosity is unstable, especially in low temperature conditions in winter, and it often causes gelation due to increased viscosity. It needs to be heated before it can be used, which not only brings a lot of inconvenience to winter construction, but also affects the bonding quality. Therefore, the storage conditions are generally required to be above 10 °C. In response to this shortcoming, domestic and foreign researchers have actively developed low-temperature non-gelling white latex to solve winter storage and construction problems. The antifreeze white latex described below reduces the gelation temperature to 2 °C.

(1) Raw materials

1. Vinyl acetate (CH3COOCH=CH2) is abbreviated as vinyl acetate, a colorless flammable liquid with a strong aroma. Its vapor is irritating to the eyes with a relative density of 0.9312 (20 ° C). The boiling point of 72 ~ 73 ° C. Insoluble in water, soluble in most organic solvents, can be polymerized with other monomers.

2. Polyvinyl formal A resin obtained by condensing polyvinyl alcohol and formaldehyde.

3. Emulsifier OP-10 [C8H17C6H4O(CH2O)10H] The chemical name is octyl (or decyl) phenol polyoxyethylene (10) ether. Appearance is yellow or brown paste, relative density 1.06, freezing point 7. 2 ° C. Dissolved in water, the aqueous solution is a transparent liquid, also soluble in carbon tetrachloride, lower alcohols and most aromatic solvents. Can withstand acid and alkali.

4. Potassium persulfate (K2S2O8) White fine or large crystals with a relative density of 2.477, decomposed above 100 °C, releasing oxygen to become potassium pyrosulfate. Soluble in water, insoluble in ethanol, strong oxidizing.

5. Sodium bicarbonate (NaHCO3) is also referred to as sodium carbonate or sodium acid carbonate. Commonly known as baking soda, roasting soda or heavy alkali. White monoclinic crystal. The relative density is 2.20. In hot air, it can slowly lose some carbon dioxide and heat up to 270 °C to lose all carbon dioxide.

6. Dibutyl phthalate A colorless, transparent, oily liquid that is flammable and has an aromatic odor. The relative density is 1.045, the boiling point is 340 ° C, insoluble in water, soluble in organic solvents such as ethanol and ether. As a plasticizer here, the film formation temperature of the polymer can be remarkably lowered.