WINDBOND CR-101P is Urea Formaldehyde resin and belongs to thermosetting resin group. It has exceptional bond strength when added with hardener. It is moisture resistance and cost effective. It provides an excellent adhesive strength for interior wood base application.
1. PHYSICAL PROPERTIES AND SPECIFICATIONS FOR RESIN POWDER
|APPEARANCE||:||WHITE FREE FLOWING POWDER|
|VISCOSITY (1:1) AT 25°C||:||22-45 SEC IN B4 CUP|
|pH OF 50% SOLUTION AT 25°C||:||8.5 TO 10.0|
|GEL TIME AT 100°C||:||4.0 TO 6.0 MINUTES.|
|POT LIFE AT 30°C||:||6 TO 7.0 HOURS|
|WATER TOLERANCE IN 50% SOLUTION (1:1)||:||1:1.0 TO 1.5|
|SOLUBILITY||:||EASILY SOLUBLE IN WATER|
|FREE FORMALDEHYDE||:||< 1.0 %|
|VOLATILE MATTER (105°C/1 hr.)||:||MAX. 3%|
2. GLUE PREPARATION
|POWDER||:||100 PARTS BY WEIGHT|
|WATER||:||100-110PARTS BY WEIGHT|
|WHEAT FLOUR||:||8 TO 12 % OF TOTAL WEIGHT (POWDER + WATER)|
|HARDENER||:||0.05 TO 0.5% OF TOTAL WEIGHT DEPENDING ON WEATHER CONDITION|
|LIQUOR AMMONIA||:||TO MAINTAIN pH OF GLUE MIXTURE. pH SHOULD BE BETWEEN 6.5 TO 7.0|
3. GLUE MAKING PROCEDURE
Take 50% of the total water in glue mixer. Add resin powder and required quantity of wheat our. Mix well for 15-20 minutes until all powder dissolved and lump free paste is prepared. Then add rest of water and mix well for 10 minutes. Temperature may be maintained 20-35°C. Check viscosity, if needed some water may be added to maintain the required viscosity 14-16 seconds in B6 cup. Mix the hardener immediately before use.
4. REACTIVITY OF GLUE
The selection of reactivity would normally depend upon the local conditions. The reactivity of the glue can be adjusted over a wide range by varying the composition and quantity of hardener.
5. POT LIFE PROCESS
Pot life is the amount of time that the resin remains workable i.e. useable after addition of ammonium chloride. Take and mix properly powder 2 parts + water 1 part by weight. Then take 50 gm solution and add 2 gm solid ammonium chloride and stir continuously until the paste becomes rubbery. Note down the time, the pot life of particular paste.
6. GLUE CONSUMPTION
The veneer surface should be properly cleaned and free from dust and other contamination. Veneer should be flat with uniform thickness. In general, the consumption of glue varies between 250 to 350 gm per square meter based on manufacturing condition and veneer quality.
7. PRE-PRESSING AND HOT PRESSING CONDITION
Pre-pressing is suggested to ensure uniform glue transfer. Pre-pressing panel can be handled to increase productivity as well as prevent uneven glue spraying during loading in the hot press. The speci c pressure should be 2-3 Kg/cm, pressing time varies from 15-30 minutes. Hot pressing time and pressure varies for dierent wood density. Normally wood density varies from than 500 to 600 kg/cubic meter.
For wood density less than 550 kg/cubic meter, Hot Press pressure 8-12 Kg/sq.cm and for wood density more than 550 kg/cubic meter, Hot Press pressure 14-16 Kg/sq.cm Hot press temperature to be maintained between 115 to 125°C depending on the thickness of veneer and Hot Press pressure.
Hot pressing time = Basic setting time (2 minutes) (equivalent to gel time) + Heat transfer time to the farthest glue line (normally 1 minute per mm; such as for 6 mm thickness, farthest glue line is 3 mm, so ht. transfer Time to the farthest glue line is 3 minute.)
The equipment like glue mixer, spreader should be cleaned with warm water and this should be done before the glue is completely cured. The addition of slight urea to the water will facilitate cleaning process.
9. MAJOR APPLICATION AREAS
Plywood, Particle Board, Chip Board, MDF, Furniture Joints, Paint Coating, Veneers, Doors.
25 Kg packing available in HDP/PP bag with polyethylene liner.
Urea formaldehyde resin contains free formaldehyde which may cause skin inflammation in case of direct contact with sensitive persons. Direct skin contact should be avoided. Hands should be washed with soap and water before meal and when handling is over.
Store in original bags in a cool and dry place to protect from heat and moisture absorption. The resin is hygroscopic, so bags should be properly stitched up. Limitation of resin paste is the viscosity which is increased faster at higher storage temperature. Storage life at 25°C: 12 months.