water fountain, fountain water fountain, water for fountain Guangzhou Dewy water fountain Technology Co., LTD , https://www.dewyfountain.com
Guilin Zhengdong Chemical Company presents a detailed description of its white latex formulation and production process. White latex is a thermoplastic adhesive created through the emulsion polymerization of vinyl acetate, polyvinyl alcohol, dibutyl phthalate, octanol, and ammonium persulfate. It is widely used in various industries such as wood processing, wood-based panels, cement mortar, paper, fabric, leather, and ceramics due to its strong bonding properties, ease of use, and simple manufacturing process. However, one major drawback is its unstable viscosity, especially during cold winter conditions, where it tends to gel or thicken, making it difficult to apply without heating. This not only causes inconvenience during winter construction but also affects the quality of the bond. As a result, storage is typically required at temperatures above 10°C. To address this issue, researchers both domestically and internationally have been developing low-temperature non-gelling white latex to improve performance in cold environments. Below are some methods for preparing and using these improved formulations.
**Method One: Standard White Latex Formulation**
**Raw Materials:**
1. **Vinyl Acetate**: A flammable, colorless liquid with a strong odor, used as a monomer in polymer synthesis.
2. **Polyvinyl Alcohol (PVA)**: A white powder that acts as an adhesion aid, improving the stability of the emulsion.
3. **Dibutyl Phthalate**: A plasticizer that enhances flexibility and lowers the film formation temperature.
4. **Octanol**: A solvent used to improve the solubility of other components.
5. **Ammonium Persulfate**: A polymerization initiator that helps start the reaction.
**Formula (by weight):**
- Vinyl Acetate: 45%
- Polyvinyl Alcohol: 5%
- Dibutyl Phthalate: 4%
- Octanol: 1%
- Ammonium Persulfate: 0.1%
- Water: 44.9%
**Preparation Process:**
1. Mix dibutyl phthalate with octanol until fully dissolved.
2. Heat water to 70°C, add PVA, and stir until completely dissolved. Raise the temperature to 90°C and maintain it until all PVA is dissolved. Cool to 66–69°C, then add vinyl acetate.
3. Combine the solution from step 1 with the mixture from step 2, add ammonium persulfate, and perform emulsion polymerization at 66–69°C.
**Usage Instructions:**
The product can be used directly or diluted with warm water (30–40°C) in a ratio of 20–30%. Avoid using cold water, as it may break the emulsion. After dilution, starch paste or other thickeners can be added. For wood bonding, apply the adhesive on both surfaces, allow it to dry for 5–20 minutes depending on the amount, then press under pressure (0.294–0.490 MPa) for at least 3 hours. Full curing takes 8–16 hours. Heat curing is also an option, reducing curing time significantly.
**Method Two: Antifreeze White Latex**
This method improves low-temperature performance by incorporating polyvinyl formal and adjusting the pH with sodium bicarbonate. The formula includes vinyl acetate, polyvinyl formal, OP-10 emulsifier, potassium persulfate, and dibutyl phthalate. The process involves emulsifying the ingredients, initiating polymerization, and controlling the temperature to ensure stability. The final product has a milky white appearance, good viscosity, and excellent bonding strength even at low temperatures.
**Method Three: Ordinary White Latex Production**
A standard formulation using vinyl acetate, OP-10, PVA, potassium persulfate, sodium bicarbonate, and dibutyl phthalate. The process involves dissolving PVA in water, adding emulsifiers and initiators, and gradually introducing vinyl acetate while maintaining controlled temperature. Proper control of the reaction temperature and initiator addition ensures a stable, high-quality emulsion. Adjustments can be made based on viscosity, stability, and water resistance requirements.
By following these methods, manufacturers can produce high-performance white latex suitable for a wide range of applications, especially in cold climates where traditional formulations may fail. Whether for industrial or DIY use, these formulations offer reliable bonding solutions with improved durability and usability.