木质纤维的冷冻活化及其制备无胶板材

doi:10.3969/j.issn.1673-5854.2022.03.003

Abstract

Abstract:

Sodium hydroxide-polyethylene glycol-urea mixed solution was used to activate wood fiber under freezing, and then the binder-free fiberboard was prepared. By comparing the mechanical properties of binder-free bonding fiberboard, the better freezing activation process of eucalyptus fiber was determined. The freezing activation effect of wood fiber was characterized by FT-IR, XRD, DSC, TG and XPS. The results showed that the better freezing conditions were as follows: the mass ratio of sodium hydroxide, polyethylene glycol, and urea was 7∶4.2∶12, the mass ratio of activator(i.e, the total mass of sodium hydroxide and urea) and wood fiber was 1∶12, the freezing temperature was -15 ℃ and the freezing time was 45 min. The water absorption thickness expansion rate, internal bonding strength, static bending strength, and elastic modulus of the prepared fiberboard increased by 45%, 238%, 177%, and 129% of the performance requirements in GB/T 11718—2009 Medium Density Fiberboard, respectively. The freezing activation treatment could destroy the hydrogen bond between the cellulose in the wood fiber, improve the reaction activity of hydroxyl and increase the number of active hydroxyl, produce new crystals while expanding the cellulose lattice, and reduce the thermal stability of the wood fiber.

Key words: binder-free bonding, freezing activation, wood fiber

CLC Number:

TQ35

Zixu GUO, Han WANG, Mingwei DI, Jianing ZHAO. Freezing Activation of Wood Fibers and Preparation of Binder-free Boards[J]. Biomass Chemical Engineering, 2022, 56(3): 16-22.

Figures/Tables 7

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References 27

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活化条件 activated condition		吸水厚度膨胀率/% thickness swelling ratio of water absorption	内结合强度/MPa internal bond strength	静曲强度/MPa static bending strength	弹性模量/MPa elastic modulus
m(PEG)∶m(NaOH)	0.0∶1	24.3	0.80	56.4	4531
	0.4∶1	21.4	0.95	58.3	4563
	0.6∶1	19.3	1.52	60.2	4672
	0.8∶1	20.1	1.46	55.8	4147
	1.0∶1	19.9	1.39	52.5	4134
m(活化剂)∶m(纤维) m(activator)∶m(fiber)	1∶18	26.2	0.99	58.8	4851
	1∶16	26.1	1.15	62.7	4963
	1∶14	25.9	1.15	59.9	4917
	1∶12	19.1	1.59	59.4	4883
	1∶10	20.6	1.28	54.7	4458
冷冻温度 freezing temperature	-6 ℃	24.5	1.12	52.1	4361
	-9 ℃	24.4	1.37	57.9	4349
	-12 ℃	22.3	1.57	57.6	4477
	-15 ℃	19.5	1.85	62.2	4611
	-18 ℃	19.9	1.68	60.0	4880
冷冻时间 freezing time	0 min	24.4	0.89	64.8	5268
	30 min	22.4	1.71	65.8	5211
	45 min	19.2	2.03	72.0	5961
	60 min	19.2	2.04	67.2	4883
	75 min	19.6	1.90	59.5	4669

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Freezing Activation of Wood Fibers and Preparation of Binder-free Boards

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