Case Study

DINBUMA

Top Page

Case Study

Brief introduction of Tannin—phenol resin powder adhesive for Charcoal Veneer

1. Advantages of Tannin—Phenol Formaldehyde (TPF) resin powder adhesive

Tannin—phenol resin powder adhesive can be used as type 1 adhesive which is made by partly substituting tannin abstract from larch bark for formaldehyde in PF. The main advantages of Tannin-phenol formaldehyde are shown as follows:

a. Lower toxicity, free phenol and free formaldehyde content;

b. Steady quality, long storage life;

c. Convenient transportation;

d. Lower price compared with PF.

2. Technological parameters of TPF

Appearance: Brown powder

Solid content ≥92%

Acid value (PH) 10.5~12.0

Viscosity: 70~150 seconds/25℃ (U-4^# cup )

Alkalinity:3.0~6.5

Free phenol: <0.3%

Free Formaldehyde: <0.2%

Storage life: one year

Water mixing ration: above 20 times

3. Storage conditions

a. The Tannin phenol formaldehyde resin adhesive must be stored under the airproof and damp proof conditions.

b. The tannin phenol formaldehyde resin adhesive should avoid insulation and higher temperature environment.

4. Using methods

a. Mixing TPF powder into water at the ratio 1: 0.9, that means adding 50kg TPF powder into 45kg water., in addition to adding 5kg flour into the mixture.

b. Water temperature:

In summer, cool water can be used directly, in winter the temperature of water is 40℃。

c. Mixing round time:

Mixing round the TPF solution by hand until there are not granolas in the solution, the adhesive solution can be used in 24 hours. If mixed round by machine, the adhesive solution can be used in 30 minutes after mixing up.

d. Active life of TPF adhesive solution

In summer, the TPF adhesive solution should be use up in five days. In winter, the active life of TPF adhesive solution is above ten days.