Formaldehyde free adhesive composition
An adhesive and composition technology, applied in the direction of film/sheet adhesive, adhesive type, ester copolymer adhesive, etc., can solve the problem of expensive packaging, high cost, poor processability and water resistance performance issues
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[0064] Some embodiments of the present invention will now be described in the following examples, in which all parts and percentages are by weight unless otherwise indicated.
[0065]Table 1. Raw materials
[0066]
[0067] Measurement of Glass Transition Temperature
[0068] 10 grams of the emulsion were placed in a plastic dish and allowed to dry at room temperature for 24 hours. The resulting film was then subjected to 50°C for 48 hours to further dry the film. A small piece of film was cut and placed in a standard aluminum hermetic pan from TA Instruments, which was sealed. The sample was subjected to two cycles of -60°C to 100°C at a heating ramp rate of 10°C / min. The glass transition temperature of the polymer was measured at the midpoint of the bend using the half-height method.
[0069] boiling water test
[0070] One of the most important requirements of plywood is water resistance. According to the Chinese standard GB / T18259-2009, for class I plywood, it nee...
example 1
[0078] Example 1: Comparative Example and Example of the Invention
[0079] According to the recipe, acrylic emulsion, epoxy or acrylic-epoxy hybrid dispersion and water are mixed together and defoamer is also added. Fillers are added and dispersed by stirring. A rheology modifier was added to adjust the viscosity to about 20000 cp (Brookfield, 5#, 30 rpm). Add curing agent and disperse by stirring. Additives (if any) can be added. Adhesive compositions are ready-to-use. The above components and their contents are listed in Table 2 below.
[0080] To simulate conditions in a factory, the adhesive composition was waited 4 hours before being applied to the surface of the wood ply. After 4 hours, the adhesive was applied to the wood layer (30 cm x 30 cm). Load capacity is 200g / m 2 . The wood here is eucalyptus which is widely used in the market. The wood layers with adhesive were left for another 4 hours before being stacked layer by layer for pressing at room temperat...
example 2
[0088] IE-4 samples were sent to the Wood Products Quality Test & Inspection Center of State Forestry Administration (Nanjing, China) to evaluate the formaldehyde value. No formaldehyde values were detected, which proves the concept of formaldehyde-free.
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