1. Use
The agent is made of vinyl acetate, polyvinyl alcohol, dibutyl phthalate, and octanol as raw materials, and is prepared by mixing and preparing, and is mainly used for binding cellulose materials, such as wood products and paper products. In the construction, woodworking, packaging and other industrial sectors have a wider application. Compared with white latex, this agent can be stored and constructed in winter.
2. Raw materials
(1) Vinyl acetate: Also known as vinyl acetate, short for vinyl acetate, a colorless flammable liquid. Strong scent. Its vapor is irritating to the eyes. Insoluble in water, soluble in most organic solvents. Used to make vinyl esters and synthetic fibers. Also used to make rubber, paint, adhesives and so on. It is the main raw material of this agent. Use industrial products.
(2) Polyvinyl formal: Condensed from polyvinyl alcohol and formaldehyde. Used as a modifier in this agent.
(3) Dibutyl phthalate: A colorless liquid. Insoluble in water, soluble in organic solvents such as ethanol and ether. It is a plasticizer for making plastics, synthetic rubber, and artificial leather. It is also a fragrance solvent and curing agent. This agent is used as a plasticizer. Use industrial products.
(4) Emulsifier OP-10: Yellow or brown paste. This agent is used as emulsifying dispersant. Use industrial products.
(5) Potassium persulfate: white flake crystals. Used as a polymerization initiator in this agent. Use industrial products.
(6) sodium bicarbonate: commonly known as baking soda, roasting soda, also known as acid sodium carbonate, sodium bicarbonate. White crystal powder. Soluble in water, insoluble in ethanol. Its aqueous solution is weakly alkaline. It is used as a digestive aid and antacid in medicine, and can also be used as a raw material for refreshing drinks such as extinguishing agents, baking powders, and sodas. This agent is used as a pH adjuster. Use industrial products.
3. Formula (weight parts)
Vinyl acetate
150
Polyvinyl formal (10%)
150
Dibutyl phthalate
18
Emulsifier OP-10
2
Potassium persulfate
0.4
Sodium bicarbonate
0.6
4. Preparation and use methods
The polyvinyl formal, the emulsifier OP-10 and water were added to a reaction vessel with a reflux condenser and a stirrer, and the stirrer was started to mix well. Then 15% of the total amount of vinyl acetate and 40% of the total amount of potassium persulfate were added. The temperature is increased by heating, and reflux occurs when the temperature rises to 66°C. The temperature was used to control the reflux rate. After the reflux disappeared, the temperature was raised to about 80° C., and vinyl acetate was continuously added dropwise at a rate of 10% of the total amount of vinyl acetate per hour. At the same time, the total amount of initiator per hour was 4 to Add 5% potassium persulfate solution. Control the addition of vinyl acetate within 8 hours or so. After the addition is complete, add the remaining potassium persulfate, heat up to 90-95°C, hold for half an hour, and finally cool to below 50°C. Aqueous sodium bicarbonate and dibutyl phthalate can be mixed well.
Use the same method as white latex.
Source: 21st Century Fine Chemicals Network