Decrease quickly as cosmopolitan forest natural resources and our country is natural forest of resource protection project carry out, young timber goes all out big board stick with respect to requirement adhesive receive intensity and fast be able to bear or endure await wait for itself of function excel lumber. How many of adhesive dosage, already made the mark that measures lumber technology to develop a standard. The arteries and veins that the lumber adhesive that people used in the past wants raw material to be given priority to with formaldehyde more wakes colophony, phenolic aldehyde colophony and 3 get together colophony of cyanogen ammonia formaldehyde, but exist as a result of the formaldehyde of free, the meeting between product operating period gradually to all round send out formaldehyde gas, cause environmental pollution. Lumber treatment industry already began to deliver the view get together to new-style environmental protection adhesive ammoniac F7B glue, with period the pollution that reduces pair of environments.
The adhesive of polyurethane of solidify of odd constituent damp that carpentry industry uses is liquid state, use below room temperature. Normally its are stuck receive strength tall, flexibility and be able to bear or endure ability in swimming is good, can mix a lot of base material that be not wood (like spin fiber, metal, plastic, wait like glue stick receive. The dry, wet strength that adhesive of odd constituent polyurethane shows in the test all is close friends stick at phenolic aldehyde adhesive before receiving, sticking receive base material surface besmear cloth classics is methylic a benzene 2 phenol (HMR) coincidence agent can rise stick receive strength, HMR can strengthen adhesive of all hot solid lumber stick receive strength. Besmear beforehand when lumber surface when HMR coincidence agent, the intensity of adhesive of odd constituent polyurethane and wear can satisfy the test requirement with strict much.

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