WINDBOND MR 101L

GENERAL INFORMATION

WINDBOND MR 101L Melamine urea formaldehyde resin is condensation copolymerization resin product and belongs to the thermosetting group. It conforms to MR grade plywood with higher moist weather resistance. It is suitable in the manufacture of particle board, chipboard panel. It is easily soluble in low/high atmospheric temperature and its relatively higher cost of raw material pay compensation with better quality of panel properties.

Melamine content in WINDBOND MR 101L resin varies between 2-10%.

PHYSICAL PROPERTIES AND SPECIFICATIONS FOR RESIN POWDER

WINDBOND MR-101L
SPECIFICATION
PROPERTIES SPECIFIC VALUES
APPEARANCE WHITE FREE FLOWING POWDER
VISCOSITY (1:1) AT 30°C 22-37 BY B4 CUP
pH OF 50% SOLUTION AT 30°C 8.0-10.0
POT LIFE AT 30°C 2-3 HOURS
WATER TOLERANCE 1:1.8-2.0
SOLUBILITY EASILY SOLUBLE IN WATER
FREE FORMALDEHYDE MAX. 1%
VOLATILE MATTER (105°C/1 hr.) MAX. 2-3%

GLUE PREPARATION

POWDER 100 PARTS BY WEIGHT
WATER 100-110PARTS BY WEIGHT
WHEAT FLOUR 8 -12% OF POWDER BY WEIGHT
HARDENER AMMONIUM CHLORIDE WITH AMMONIA SOLUTION

Ammonium Chloride, 0.2 to 1.0% of Powder by weight following ammonia solution for neutralization of pH may be used depending on weather condition.

GLUE MAKING PROCEDURE

The method of mixing will depend on the availability of equipment. Usual mixing method as given below

Take 50% of the total water in glue mixer. Add resin powder and required a quantity of wheat flour. 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. The temperature may be maintained at 20-35°C.

Check viscosity, if needed some water may be added to maintain the required viscosity
25-35 seconds in B6 cup.

Mix the hardener immediately before use.

REACTIVITY OF GLUE

Local conditions determine the selection of reactivity. The reactivity of the glue can be adjusted over a wide range by varying the composition and quantity of hardener. Hardener percentage is dependent on the wood chips pH, weather and plant parameters.

POT LIFE PROCESS

Pot life is the amount of time that the resin remains workable i.e. usable 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.

GLUE CONSUMPTION

The veneer surface should be properly cleaned and free from dust and other contamination. Veneer should be flat with uniform thickness. Veneers moisture content should be in between 8 to 10%. Between two adjoining veneers, moisture content should not vary more than 2%.

In general, the consumption of glue varies between 300 to 450 gm per square meter based on manufacturing condition, veneer quality.

PRE-PRESSING AND HOT PRESSING CONDITION

Pre-pressing is suggested to ensure uniform glue transfer. The pre-pressing panel can be handled to increase productivity as well as to prevent uneven glue spraying during loading in the hot 2 press. The specific pressure should be 2-3 Kg/cm, pressing time varies from 15-30 minutes.

Hot pressing time and pressure varies for different 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 8-2 Kg/sq.cm and for wood density more than 550 kg/ cubic meter, Hot Press pressure 14-16 Kg/sq.cm Hotpress 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; for 6 mm thickness, farthest glue line is 3 mm, so ht. trans. Time to the farthest glue line is 3 minute.)

After pressing, the temperature of the boards should be brought down to a minimum level before stacking, otherwise, there may be deterioration of the board.

CLEANING

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 the cleaning process.

MAJOR APPLICATION AREAS

For the making of moisture resistance grade plywood, MDF, laminated veneer lumber, Particle Board.

WINDBOND MUF-MR 101P has an application where boards with low formaldehyde emissions are required.

PACKING

25 Kg packing available in HDPE bag with polyethylene liner. Also it is available in 25 Kg multi wall paper bag with polyethylene liner.

HANDLING

During handling powder, it is wise to use hand gloves to avoid direct skin contact. Hands and other contact area should be washed with soap and hot water before a meal and when handling is over. Dust Mask can be used.

STORAGE

Store in original bags in a cool and dry place to protect from heat and moisture absorption. The resin is hygroscopic and will pick up moisture from atmospheric air. Bags not be kept open and should be properly closed during storage. Storage life at 25°C: 12 months.