高替代率木质素酚醛树脂在胶合板中的应用性能比较

doi:10.3969/j.issn.0253-2417.2022.04.011

Abstract

Abstract:

Lignin-based phenolic resin(LPF)with high phenol substitution rate(≥70%) were synthesized based on alkali lignin(UL)from black liquor of kraft pulping of spruce, or based on demethylated lignin(DUL) and hydroxymethylated lignin(HUL) obtained from the modification of UL. The effects of the hydroxyl content of three types of lignin on the adhesive strength and free formaldehyde content of LPF adhesives were compared and analyzed in this paper. The results of structure analysis of lignin showed that the hydroxyl ratios of DUL and HUL increased by 26.41% and 72.35%, respectively, while compared to raw UL. UL, DUL and HUL were separately used to replace phenol for the preparation of LPF that were applied in the bonding experiment of poplar veneer. The experimental results showed that demethylation of UL could further improve the heat-resistant water-based bonding strength((σ_HWT). At 30% lignin substitution rate, DUL showed the largest σ_HWT of 1.09 MPa, which was 39.39% higher than PF(0.78 MPa). The replacement rate of lignin increased from 30% to 70%. Meanwhile, the content of free formaldehyde in plywood decreased from 0.33 mg/L to 0.29 mg/L, which was still less than the requirement of national standard GB 9846.2—2004(< 0.5 mg/L). The bonding strength of LPF prepared from HUL was significantly improved after modification of UL by hydroxymethylation. At 30% lignin replacement rate, the dry bonding strength(σ_dry) and wet bonding strength(σ_WST) were 2.55 MPa and 1.99 MPa which increased by 79.02% and 135.31% respectively, while compared those with PF(1.43 MPa and 0.84 MPa).

Key words: lignin, lignin modification, bonding strength, free formaldehyde content

CLC Number:

TQ35

Hui ZHAO, Yanru XU, Hao REN. Application Performance Comparison of Lignin-based Phenolic Resin with High Phenol Substitution Rate in Plywood[J]. Chemistry and Industry of Forest Products, 2022, 42(4): 75-80.

Figures/Tables 6

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Table 4

References 17

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原料raw material	M_n	M_w	M_w/M_n(PDI)
碱木质素(UL)	1 631	6 348	3.89
脱甲基化木质素(DUL)	1 468	4 468	3.04
羟甲基化木质素(HUL)	3 266	27 332	8.36

样品 sample	脂肪族羟基 aliphatic hydroxyl	缩合酚羟基 condensed phenolic hydroxyl	愈创木基酚羟基 guaiacyl OH	对羟基苯基酚羟基 p-hydroxyphenyl OH	总酚羟基 total phenolic hydroxyl	羧基 carboxyl
UL	2.93	1.39	2.95	0.28	4.62	0.39
DUL	3.01	2.55	3.01	0.28	5.84	0.41
HUL	5.05	3.77	0.63	0.28	4.68	0.42

木质素替代率/% lignin substitution rate	σ_dry/MPa			σ_WST/MPa			σ_HWT/MPa
木质素替代率/% lignin substitution rate	UL	DUL	HUL	UL	DUL	HUL	UL	DUL	HUL
0	1.43	1.43	1.43	0.84	0.84	0.84	0.78	0.78	0.78
10	2.18	2.33	2.25	0.97	1.14	1.77	0.77	1.21	1.23
30	2.28	2.43	2.55	1.04	1.16	1.99	0.89	1.09	1.02
50	1.99	2.18		0.72	1.04		0.64	0.79
70	1.28	1.34		0.62	0.68		0.62	0.64

木质素 lignin	不同替代率下的游离甲醛/(mg·L^-1) free formaldehyde under different substitution rates
木质素 lignin	0	10%	30%	50%	70%
UL	0.13	0.15	0.16	0.25	0.33
DUL	0.13	0.14	0.15	0.17	0.29
HUL	0.13	0.16	0.17

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Application Performance Comparison of Lignin-based Phenolic Resin with High Phenol Substitution Rate in Plywood

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