环氧化木质素增强三聚氰胺-尿素-甲醛共缩聚树脂研究

doi:10.3969/j.issn.0253-2417.2023.06.007

Abstract

Abstract:

Epoxidized lignin(EL) was prepared by epoxidation of epichlorohydrin with the hydroxyl and carboxyl groups in lignin molecules. EL was used as a formaldehyde-free cross-linking agent for melamine-urea-formaldehyde(MUF) co-condensation resins to improve the bonding strength of MUF resin, and the reaction between EL and free formaldehyde in the MUF resin decreased the formaldehyde emissions of resin. With the increase of ring-opening reaction temperature between lignin and epichlorohydrin, the epoxy group content of EL showed a trend of increasing and then decreasing, which was determined by the infrared spectroscopy and chemical titration methods. The EL epoxy index reached the highest value of 2.6 mol/kg at 100 ℃. Compared with the MUF resin without EL, the modulus of elasticity(5.94 MPa) of added 5% EL-100 MUF resin increased by 117% after curing, and shear strength(1.11 MPa) increased by 33.7% and the formaldehyde emission(0.206 mg/L) decreased by 27.0%.

Key words: lignin, epoxidation, urea-formaldehyde(UF) resin, plywood

CLC Number:

TQ35

Shishuai GAO, Yitong XIE, Xiulan CHEN, Chunpeng WANG, Fuxiang CHU, Daihui ZHANG. Investigation on the Epoxidized Lignin for Reinforcing Melamine-Urea-Formaldehyde Co-condensation Resins[J]. Chemistry and Industry of Forest Products, 2023, 43(6): 51-56.

Figures/Tables 5

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Table 1

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References 17

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样品 sample	开环温度/℃ ring opening temperature	S₉₀₇/S_{1 500}¹⁾/%	环氧指数/(mol·kg^-1) epoxy value	初始热解温度/℃ initial degradation temperature	最大热解温度/℃ maximum degradation temperature	最大热解速率/(%·min^-1) maximum degradation rate	残炭率/% residual carbon ratio
EL-60	60	19.67	1.9	217.7	302.2	3.52	38.09
EL-80	80	30.44	2.4	262.8	306.9	3.32	39.39
EL-100	100	36.68	2.6	272.6	361.7	4.43	38.05
EL-110	110	29.24	2.5	254.0	307.5	3.05	42.71

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Investigation on the Epoxidized Lignin for Reinforcing Melamine-Urea-Formaldehyde Co-condensation Resins

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