Engineered wood with polyurethane adhesives

Wood in the construction industry applications are experienced a renaissance. The new bonding methods and architectural principles, not to mention the classic modern architecture solutions for the material found has opened up a new wooden building possible.

Now, the application of timber is not limited to home construction, it has been for the construction of administrative office buildings, schools, multi-family homes, bridges, theaters, and even power transmission tower. The timber industry from a pure hand-made to the reform of industrial production also contributed to this trend of development, industrial production can be the scene quickly and accurately bonded semi-finished products to a larger component made of, which makes the construction of large structures with the architectural features becomes fast and economical.

However, without the use of high-performance adhesives, we may imagine we are now in the load-bearing wood construction achievements. Modern single-component polyurethane system allows this application has a number of key advantages.

Be directly attached to the adhesive coated surface; this way, we do not need in the coated adhesive prior to the various components are mixed, and need not take into account any period of application problems. Also, this binder odorless and does not contain formaldehyde and solvents, are environmentally friendly.

Compared with the other adhesive systems, its production process more economical, use less; just after a very short time, be able to squeeze a solid and permanent components bonded together.

Switzerland, Sempach Station is located in the Purbond AG is a single-component polyurethane (PU) adhesives market and technology leader in its adhesive was used to produce load-bearing wood components. Bayer MaterialScience is the application of raw materials isocyanate prepolymers of the leading suppliers. This engineered wood adhesives have passed tests and be allowed to introduce market. In Germany, Stuttgart University, Institute of Materials Testing (MPA) is responsible for testing and evaluation. MPA originally based on phenol - resorcinol and melamine-urea resin, the study of testing methods,
To determine the adhesive bond strength, coated characteristics, long-term stability properties.

In 1994, Germany approved for use in load-bearing wood components, the first a single-component polyurethane adhesives obtained the approval of common standards. In MPA, Purbond and Bayer MaterialScience, the existing test methods under the standard does not take full account of the outstanding characteristics of polyurethane adhesive.

In order to obtain a more reliable test results, and to ensure the continued market success polyurethane systems, MPA and Bayer MaterialScience Purbond support, plans to develop new testing methods to improve the long-term behavior predictions. This work will integrate the latest scientific discoveries to applied through the use of the basic projects to improve the current standards.