Urea vinegar adhesive formula for plywood

[ Formula ]
Molar ratio of urea to formaldehyde 1 : ( 1.05~1.2 )
Polyvinyl alcohol ( % ) 0.4~1.0
Modified starch ( % ) 1.0~2.0
20% amount of acetic acid
25% amount of ammonia
20% aqueous sodium hydroxide solution
    The above materials are all industrial products.
    [ Preparation method ] In the enamel reactor, first add 37% formaldehyde solution, start stirring, adjust the pH to 8.1 with 20% acetic acid, 25% ammonia, add the first batch of urea and polyvinyl alcohol, quickly Warm up to 85~90 °C , keep at this temperature for 1 hour, then intermittently measure the viscosity and turbidity point. After the two arrive, use 20% sodium hydroxide solution to adjust the pH to 7.5~8.0 and add the second batch of urea at 85 °C . After a half-hour reaction at ~90 °C , the turbidity point was measured intermittently. After reaching it, the pH was adjusted to 8.0 with 20% sodium hydroxide solution. The third batch of urea and the modified starch were fed to room temperature for discharge.

Outdoor Swing Set

Outdoor Swing Set using rattan hand weaving one by one and aluminum rush resistant frame, with stronger steel support with rust-proof outdoor powder-coated.

Outdoor Swing Set make your garden more beautiful . Rattan fibers are smoothly double woven around concealed powder-coated aluminum frames. Gently angled backs and wide arms encourage restful lounging. The industry`s best high-performing fabrics encase the thick, double-wrapped foam cushions.

· Traditional forms with a spacious, inviting scale

· Handwoven premium resin wicker UV resistant

· Rust-resistant powder-coated frames

· Cushions included with 30 density sofa foam

· Versatile tempered glass tables

· Cushions also available with 100% waterproof fabric.

Outdoor sofa Furniture contain sectional sofa, deep seating sofa, round or semi-round sofa furniture, and garden set.

Outdoor Swing set

Outdoor Swing set



If you have any questions, please contact with us directly. Outdoor Sofa Furniture are produced

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