Preparation method of hyperbranched modified cellulose wood adhesive
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A wood adhesive and cellulose technology, applied in the direction of cellulose derivative adhesives, etc., can solve the problems of poor water resistance, and achieve the effect of low price, excellent water resistance, and wide sources
Pending Publication Date: 2021-12-31
SOUTHWEST FORESTRY UNIVERSITY
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[0004] However, like most biomass adhesives, the surface of cellulose adhesives exposes abundant hydrophilic groups, and there are certain disadvantages in its application in wet environments.
Therefore, in order to effectively promote cellulose-based wood adhesives, the problem of poor water resistance needs to be solved urgently.
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Embodiment 1
[0025]
[0026] Such as Figure 1 to Figure 4 Shown, the preparation method of a kind of hyperbranched modified cellulose wood adhesive of the present invention comprises the steps:
[0027] (1) Under magnetic stirring, add 2.5L deionized water, 50g microcrystalline cellulose MCC, 80g sodium periodate NaIO to the reactor successively 4 Stir at a constant speed and avoid light for 72 hours;
[0028] (2) After the reaction, the solution in the reactor in step (1) was centrifuged and washed at 10,000 rpm for 5 min, and the number of washings was 3 times. Freeze-drying obtains 37.5g dialdehyde cellulose DAC;
[0029] (3) Under magnetic stirring, add 22g of deionized water, 9.0g of dialdehyde cellulose DAC and 9.0g of PA to the reactor in sequence 3N , dialdehyde cellulose DAC and PA 3N The mass ratio is 11, the total solid content of the adhesive is 45%, the reaction condition is 70°C, 10h, and the binary synergistic copolymerization is used to prepare the cellulose-based p...
Embodiment 2
[0032] The difference between Example 2 and Example 1 is that in step (3), under magnetic stirring, 22g of deionized water, 7.2g of dialdehyde cellulose DAC and 10.8g of PA 3N , dialdehyde cellulose DAC and PA 3N The mass ratio is 46, the overall solid content of the adhesive is 45%, and the cellulose-based polymer wood adhesive is prepared by binary synergistic copolymerization.
Embodiment 3
[0034] The difference between Example 3 and Example 1 is that in step (3), under magnetic stirring, 22g deionized water, 10.8g dialdehyde cellulose DAC and 7.2g PA 3N , dialdehyde cellulose DAC and PA 3N The mass ratio is 64, the overall solid content of the adhesive is 45%, and the cellulose-based polymer wood adhesive is prepared by binary synergistic copolymerization.
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Abstract
The invention discloses a preparation method of a hyperbranched modified cellulose wood adhesive, which comprises the following steps: oxidizing microcrystalline cellulose (MCC) by sodium periodate to obtain dialdehyde cellulose (DAC), and further preparing the cellulose-based wood adhesive by taking the dialdehyde cellulose (DAC) and a hyperbranched polyamine compound as raw materials through Schiff base reaction. The hyperbranched modified cellulose wood adhesive is green and environment-friendly, free of formaldehyde release, high in bonding strength and good in water resistance when being used for plywood, and the performance of the hyperbranched modified cellulose wood adhesive is superior to that of the national standard GB/T 17657-2013. The invention aims to develop a novel cellulose-based biomass formaldehyde-free wood adhesive, and meanwhile, high-value and high-efficiency utilization of cellulose biomass resources is realized.
Description
technical field [0001] The invention relates to the technical field of biomass adhesives, in particular to a preparation method of a hyperbranched modified cellulose wood adhesive. Background technique [0002] Against the background of unbalanced supply and demand of virgin wood and industrial applications, engineered wood products such as plywood, fiberboard and particle board have emerged to replace the massive use of wood in industries such as construction, furniture and flooring, and the rapid development of these engineered wood products has greatly Thanks to the invention of wood adhesives, such as phenolic resin (PF), urea-formaldehyde resin (UF), melamine-formaldehyde resin (MF), polymerized diphenylmethane diisocyanate resin (PMDI) and other adhesives derived from fossil raw materials, They have dominated the adhesive industry for a long time by virtue of their low price, excellent adhesive performance and water and weather resistance. However, as human beings pay...
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