Preparation method for phenolic foam sandwiched composite board
A sandwich composite board and phenolic foam technology, which is applied in chemical instruments and methods, wood layered products, synthetic resin layered products, etc., can solve the problems of cracking of phenolic foam, easy falling off of phenolic foam, and low bonding strength. Achieve the effects of strong bonding performance, good thermal insulation effect, simple and feasible operation
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Embodiment 1
[0014] The first step, the preparation of phenolic resin adhesive: Ⅰ. In parts by mass, react 100 parts of phenol, 20 parts of formaldehyde and 5 parts of sodium hydroxide at 90°C for 60 minutes; Ⅱ. Add 80 parts of paraformaldehyde and 5 parts of sodium hydroxide Parts of sodium hydroxide, react at 90°C for 150 minutes; Ⅲ. Add 30 parts of urea and 5 parts of sodium hydroxide, react at 90°C for 60 minutes, cool and discharge to obtain phenolic resin adhesive;
[0015] The second step, the bonding of the phenolic foam sandwich panel: the phenolic resin adhesive containing 10%wt of sulfuric acid is coated on the particleboard by manual roller coating (the amount of glue is 50g / m 2 Single-sided count), according to the order of particleboard, phenolic foam board, particleboard stacked, pressurized at room temperature and pressure 0.1MPa for 48 hours to make particleboard and phenolic foam sandwich composite board, the performance results are shown in the attached table.
Embodiment 2
[0017] The first step, the preparation of phenolic resin adhesive: Ⅰ. By mass parts, mix 100 parts of phenol and p-cresol mixture (the mixing ratio of phenol and p-cresol is 9:1), 10 parts of glyoxal and 1 part Hexamethylenetetramine, react at 60°C for 10min; Ⅱ. Add 10 parts of paraformaldehyde and 20 parts of triethanolamine and potassium hydroxide mixture (the mixing ratio of triethanolamine and potassium hydroxide is 3:7), 60°C React at low temperature for 10 minutes; Ⅲ. Add 20 parts of ammonia water, react at 60°C for 10 minutes, cool and discharge to obtain phenolic resin adhesive;
[0018] The second step is the bonding of phenolic foam sandwich panels: use manual roller coating, and apply the phenolic resin adhesive on the bamboo-wood composite panel without adding a curing agent (the amount of glue is 200g / m2) 2 Single-sided count), according to the order of bamboo-wood composite board, phenolic foam board, bamboo-wood composite board, pressurized for 1 hour at room te...
Embodiment 3
[0020] The first step, the preparation of phenolic resin adhesive: Ⅰ. In parts by mass, mix 100 parts of phenol and hydroquinone mixture (the mixing ratio of phenol and hydroquinone is 9:1), 30 parts of formaldehyde and polymer A mixture of formaldehyde (the mixing ratio of formaldehyde and paraformaldehyde is 3:7) and 5 parts of ammonia water, react at 80 ° C for 40 minutes; Ⅱ. Add 70 parts of a mixture of formaldehyde and paraformaldehyde (the mixing ratio of formaldehyde and paraformaldehyde 3:7) and 10 parts of ammonia water, reacted at 80°C for 100 minutes; Ⅲ. Added 10 parts of urea and 10 parts of potassium hydroxide, reacted at 70°C for 30 minutes, cooled and discharged to obtain phenolic resin adhesive;
[0021] The second step, the bonding of phenolic foam sandwich panels: use artificial roller coating, mix 5wt.% phosphoric acid and p-toluenesulfonic acid (the mixing weight ratio of phosphoric acid and p-toluenesulfonic acid is 8:2) The phenolic resin adhesive of the ...
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