Application

Polyvinyl alcohol adhesive for plywood.

The polyvinyl alcohol adhesive used for plywood has high bonding strength to wood, fast curing speed, and simple manufacturing process. It has a wide range of sources, low cost, and no "trialdehyde", making it an environmentally friendly adhesive.

Raw materials and formulas：

10kg polyvinyl alcohol ，mica powder 10kg

Ethylene glycol 0.35kg ，silica sol 20kg

Polyacrylamide 0.05kg ，water 59.6kg

Preparation method：

Preprocessing

① Mix 0.35kg of ethylene glycol with 0.7kg of water for later use,

② Mix 0.05kg of polyacrylamide with 1kg of water until fully dissolved, set aside.

③ Mix 10kg of mica powder (400 mesh fine powder) with 7% water and set aside.

Hot melt

In a stainless steel jacket container equipped with temperature control, speed control, and stirring, add 50.9kg of water and raise it to 70 ℃. Under 60r/min stirring, add 10kg of PVA (22-95 type) (slowly added). After adding, raise the temperature to 90-95 ℃ and wait for it to fully dissolve. The solution was dropped to 65 ℃ and 2 ℃, and the silica sol was slowly added while stirring at 100-130 r/rain 20kg (with a silicon dioxide content of 30%); Maintain at around 50-C for 15-20mirn to fully polymerize. Then add the spare material from step ① above dropwise. Reduce to room temperature, stir at 100r/min and add the spare materials from steps ⑧ and ② separately. Finally, measure their pH values to be between 8.9 and 9.9. Filter and discharge the materials, and fill them in plastic drums.

Performance:

The polyvinyl alcohol adhesive used for plywood has high bonding strength to wood, fast curing speed, and simple manufacturing process. Widely sourced, low-cost, and free of trialdehydes, it is an environmentally friendly adhesive.

Application：

Mainly used for producing adhesive types in plywood production.