Novel non-formaldehyde wood adhesive and preparation thereof
A wood adhesive and adhesive technology, which is applied in the preparation of adhesives, animal glue or gelatin, and protein adhesives, etc., can solve the problems of high price and difficult coating of protein glue.
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[0067] Example 1
[0068] Add 15 grams of soy protein isolate and 100 grams of water into an Erlenmeyer flask, and then stir for 2 hours until the protein is completely dispersed in the water. The solution is directly used as an adhesive for wood bonding. The dry strength of the adhesive is 3.5MPa, but the wood failure rate is only 10%. According to the national standard GB / T17657-1999, the dry strength test of the adhesive is as follows: the five-layer poplar board is obtained through the processes of gluing, aging, cold pressing, and hot pressing. The cold pressing condition is 1.2 MPa, 30 minutes. The hot pressing conditions are 140°C, 1 MPa and 80 seconds / mm. The five-layer board was aged for 24 hours at room temperature, and then tested on a universal tensile machine. The wet strength of the five-layer board was soaked at 63°C for 3 hours, then cooled at room temperature for 10 minutes, and then tested on a universal tensile machine.
Example Embodiment
[0069] Example 2
[0070]Add 20 grams of soybean powder and 100 grams of aqueous solution of 5% sodium hydroxide into an Erlenmeyer flask, and then stir for 2 hours until the soybean powder is completely dispersed in the water. The mixed solution is used as an adhesive for wood bonding. The dry strength of the adhesive is 3.0MPa, but the wood failure rate is only 20%.
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[0071] Example 3
[0072] Add 20 grams of soybean powder and 100 grams of aqueous solution of 5% sodium hydroxide into an Erlenmeyer flask, and then stir for 2 hours until the soybean powder is completely dispersed in the water. Add 0.2 g of epichlorohydrin and stir for 1 hour. The mixture is used as an adhesive for wood bonding. The dry strength of the adhesive is 4.2MPa, and the wood damage rate is only 50%.
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