Lignin Impacts on the Preparation of Phenolic-resin/Lignin Block Copolymer Resin and the Reaction Mechanism†

doi:10.7503/cjcu20160517

Abstract

Abstract:

Phenolic-resin/lignin block copolymer resin was in-situ prepared using alkali lignin under different extraction conditions, phenol and formaldehyde as reactants, industrial xylose production residue as raw material. To obtain the minimum formaldehyde release, the best extraction conditions of alkali lignin are as following: the sodium hydroxide concentration is 5%(mass fraction), the mass ratio of solid/liquid is 1:12, and the reaction time is 3 h. The formaldehyde release is 0.115% and boiling water soaked bonding strength is 1.197 MPa, which are superior to the GB/T14074-2006(≤0.3%, ≥0.7 MPa). TG, FTIR and SEM results show that alkali lignin involved in the reaction. It improved the thermal stability and bonding strength of phenolic-resin/lignin block copolymer resin, at the same time it decreases the formaldehyde release. All of them improved the storage and application of resin significantly. According to our experimental results, possible reaction mechanism was proposed.

Key words: Phenolate, Phenolic-resin, Formaldehyde, Lignin

CLC Number:

TrendMD:

CHAO Wei, YANG Xiaomin, ZHOU Yu, ZHU Yanchao, WANG Zichen. Lignin Impacts on the Preparation of Phenolic-resin/Lignin Block Copolymer Resin and the Reaction Mechanism^†[J]. Chem. J. Chinese Universities, 2017, 38(2): 312.

Figures/Tables 9

Table 1 Influence of the NaOH concentration on formaldehyde release

Mass fraction of NaOH(%)	Solid/liquid volume ratio	Time/h	Formaldehyde release(%)
3	1:12	3	0.179
4	1:12	3	0.153
5	1:12	3	0.115
6	1:12	3	0.241
7	1:12	3	0.249

Fig.1 Influence of the NaOH concentration on bonding strength and phenol release

Fig.2 TG curves of lignin(a), phenolic-resin(b) and lignin-phenolic-resin(c)

Fig.3 FTIR spectra of lignin(a), phenolic-resin(b) and lignin-phenolic-resin(c)

Fig.4 SEM images of lignin(A), phenolic-resin(B) and lignin-phenolic-resin(C)

Fig.5 Three kinds basic structures of lignin

Scheme 1 Reaction equation of phenolic resin polymerization

Scheme 2 Reaction equation of lignin phenolation

Scheme 3 Reaction equation of lignin-phenolic-resin

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