Preparation of high-performance white latex using polyvinyl acetate PVAC-ethanol system.
• Solvent: Anhydrous ethanol (purity ≥95%), in an amount of 3–5 times the mass of PVAc (polyvinyl acetate solid resin).
• Stabilizer: Polyvinyl alcohol (PVA), selected from models with 88%~99% hydrolysis degree, at a dosage of 5%~15% of PVAc mass.
• Adjuvants:

o Emulsifier (e.g., OP-10, dosage 0.5%–2%) ;
pH adjuster (sodium bicarbonate solution, adjusted to pH 5–6) ;
o Plasticizer (di-butyl phthalate, dosage 5%~10%) .

2. Dissolution and Mixing
1. Polyvinyl acetate (PVAc) dissolution:
o Slowly add PVAc powder to ethanol and stir in a constant temperature water bath at 60–65°C for 2–3 hours until complete dissolution.
2. Preparation of PVA solution:
pVA is mixed with deionized water at a ratio of 1:9, stirred at 85°C to dissolve into a 10% aqueous solution.
3. Mixed emulsification:
o Add PVA solution to the polyvinyl acetate PVAc-ethanol system and mechanically stir at 500~800 rpm at 65℃;
o Slowly add the emulsifier OP-10, and maintain the reaction at a constant temperature for 1 hour and 411 minutes.
3. Post-processing
• Cooling adjustment: Reduce to 50°C, add plasticizer and 5% sodium bicarbonate solution to adjust pH to 5–6.
• Filtration and maturation:
80-mesh screen filtration, followed by 24-hour room-temperature maturation to enhance stability.

Parameter	Control Range	Function
Temperature	Dissolve at 60~65℃； Emulsifying at65℃	Prevent PVAc degrading，protect the integrity of the molecular link.
Mix Speed	500~800 rpm	Avoid bubble, enable a even dispersion.
pH	5.0~6.0（weak sour）	Maintain the stability of the pvac emulsion
PVA	88%~99%	enhance the protective effect of aqueous phase colloids.

III. Main Applications

1. Adhesive Applications
• Wood/paper bonding: Emulsified PVAC forms high-adhesion white latex with rapid drying and non-toxic properties, used in furniture and packaging industries.
• Construction adhesives: Added to cement to enhance mortar bonding and reduce cracking.
2. Coatings & Finishes.
• Interior latex paint: Serves as a film-forming base, combined with titanium dioxide and other fillers, offering strong adhesion and eco-friendliness; • Fabric coatings: Provides textiles with stiffness and waterproofing.
3. Functional Materials
• Safety glass laminates: Composite with polyvinyl butyral (PVA) as intermediate film, impact-resistant;
• Pharmaceutical carriers: Used to prepare sustained-release drug films or artificial kidney membranes.
4. Industrial Additives
• Paper reinforcement: Enhances paper tear resistance and surface smoothness;
• Ceramic temporary bonding: Fixes preforms before sintering, decomposes at high temperatures without residue.

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IV. Process Advantages & Precautions
• Advantages:
• Ethanol solvent is easily recoverable and more environmentally friendly than benzene derivatives;
• PVA synergistic emulsification reduces interfacial tension, controllable emulsion particle size (0.5~5 μm).
• Precautions:
• Avoid high temperatures to prevent PVAC hydrolysis and acetic acid formation;
• Insufficient curing may cause storage delamination, requiring anti-settling agents (e.g., carboxymethyl cellulose).

This process integrates solution dissolution and emulsion blending technologies, suitable for the development of high-value PVAC products. Specific parameters should be adjusted according to application scenarios. For more industrial cases, refer to the specialized research on polyvinyl acetate emulsion polymerization.