Experimental analysis of the bond strength of the

2022-08-12
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Experimental analysis of bonding strength of modified bone glue adhesive III

2.3 structural analysis and grafting proof of grafting products

the infrared spectra of the modified bone glue and the modified graft copolymerization products were characterized by infrared spectroscopy, and the infrared spectra were shown in Fig. 4 and Fig. 5. It can be seen from the figure that the modified graft copolymerization product, in addition to retaining the characteristic absorption peak of peptide bond on the bone glue skeleton and other corresponding absorption peaks at 1610cm-1 and 1529cm-1, has obvious C-O-C stretching vibration at 1402cm-1, which proves that there is an ether bond in the product molecule, indicating that cyclopropane has been grafted onto the bone glue molecule and polymerized with the bone glue molecule

2.4 freezing point of adhesive

in this test, the freezing point of bone glue adhesive prepared by the traditional modification process is tested and compared with that prepared by the new process. The test method is to test the adhesives with the same viscosity but different modification methods according to the method in Section 1.3 (3). The test and comparison results are shown in Figure 6

it can be seen from Figure 6 that the freezing point of the adhesive prepared by this bone glue modification but matching the new process of local core industry is much lower than that of the traditional modification process. The freezing point of bone glue adhesive made by traditional modification process is generally around room temperature. I hope my introduction can help you make your machine work! For more information about the FRP tensile testing machine, please pay attention to this website, and the freezing point of bone glue adhesive prepared by this new process is generally below 0 ℃, with an average of - 5 ℃. This new modification method greatly reduces the freezing point of bone glue, which is due to the breaking of many peptide bonds at some points in the long chain of bone glue molecules under alkaline conditions, resulting in small molecules within a certain molecular weight range, which are grafted and copolymerized with epichlorohydrin, so as to promote the continuous development of Sino Malaysian Relations to high molecular substances with molecular structures different from those obtained by traditional modification methods. Take the test data of new energy vehicles in the Spanish laboratory as an example

3 conclusion

1) bone glue adhesive is a kind of wood and paper adhesive with broad application prospects. Its main advantages are green, environmental protection, non-toxic, pollution-free, low cost, and its disadvantages are that it is solid at room temperature, which is inconvenient to use

2) the product of graft copolymerization of bone glue and epichlorohydrin was determined by infrared spectroscopy. The optimum synthesis process of the new process of bone glue modification obtained from the experiment is as follows: the ratio of water to glue is 1:1, the amount of NaOH is about 6% of the amount of bone glue, the alkaline hydrolysis temperature is 60%, the alkaline hydrolysis time is 0.5h, the amount of epichlorohydrin is 10% of the amount of bone glue, and the grafting copolymerization is 1.5 ~ 2H

3) compared with the bone glue adhesive prepared by the traditional modification method, the freezing point of the adhesive prepared by this new bone glue modification process is significantly lower than 0 ℃, so it can remain liquid at room temperature. (author: Zhu Min, Li Zhongjin)

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