环氧化天然橡胶对豆粕胶黏剂性能的影响

doi:10.11707/j.1001-7488.LYKX20220440

摘要/Abstract

摘要：

目的: 以豆粕（SM）为主要原料，通过构建双交联网络结构，提升豆粕胶黏剂的耐水胶合性能和固化胶层韧性，为豆粕胶黏剂的产业化应用提供理论依据和技术指导。方法: 利用环氧化天然橡胶（ER）和丙三醇三缩水甘油醚（PTGE），在豆粕胶黏剂体系构建双交联网络结构，研究不同环氧值ER对豆粕胶黏剂化学成分、黏度、吸湿性、残留率、热稳定性、断面形态等的影响，表征所制备杨木胶合板的耐水胶合强度。结果: 1）环氧值为50%的ER-50协同环氧交联剂PTGE改性豆粕胶黏剂（SMP/ER-50），其耐水胶合强度为1.02 MPa，相比对照组提升292.3%，达到国家II类杨木胶合板标准；2）扫描电子显微镜显示，SMP/ER-50胶黏剂的固化胶层断面出现均匀相分离结构，可有效提升胶黏剂的韧性；3） SMP/ER-50胶黏剂具有优异的耐水性能，其残留率为90.54％，较对照组提升26.65%；吸湿性为19.28%，较对照组降低14.99%。结论: SMP/ER-50胶黏剂耐水胶合性能和固化胶层韧性显著提高的主要原因是PTGE和ER-50在豆粕胶黏剂体系中形成致密的双交联网络结构，阻止水分浸入，提高胶黏剂的耐水胶合强度；双交联网络中，当受到外力作用时，ER吸收部分应力，可起到能量耗散作用，进而实现豆粕胶黏剂的增韧增强。

关键词: 豆粕胶黏剂, 环氧化天然橡胶, 增强增韧, 耐水胶合强度, 双交联网络

Abstract:

Objective: With soybean meal (SM) as the main raw material, the double cross-linked network structure was constructed to improve the water-resistant bonding performance and the toughness of the cured adhesive layer of SM adhesive, which provided theoretical basis and technical guidance for the industrial application of soybean meal adhesive. Method: Epoxidized natural rubber (ER) and glycerol triglycidyl ether (PTGE) were used to construct a double cross-linked network structure in soybean meal adhesive system. The effects of ER with different epoxy values on the chemical composition, viscosity, moisture uptake, residual rate, thermal stability, and cross-section morphology of modified SM adhesive were studied, and the wet shear strength of the prepared poplar plywood was characterized. Result: 1) ER-50 with 50% epoxy value and PTGE (epoxy crosslinking agent) were used to modify SM adhesive. The wet shear strength of the modified SM adhesive (SMP/ER-50) was 1.02 MPa, which was 292.3% higher than that of the control group and reached the national standard of class II poplar plywood. 2) It was observed by scanning electron microscope that the cross-section of the cured adhesive layer of SMP/ER-50 adhesive appeared to have a uniform phase separation structure, which effectively improved the toughness of the adhesive. 3) SMP/ER-50 adhesive had excellent water resistance, and its residual rate was 90.54%, which was 26.65% higher than that of the control group. The moisture uptake was 19.28%, which was 14.99% lower than that of the control group. Conclusion: The main reason for the improvement of water resistance and toughness of SMP/ER-50 adhesive was that PTGE and ER-50 formed a dense double cross-linking network structure in the adhesive system, which prevented water immersion and improved the water resistance of SMP/ER-50 adhesive. In the double cross-linking network, ER absorbs part of the stress and dissipates the energy when subjected to external force, thus achieving the toughening and strengthening of the SMP/ER-50 adhesive.

Key words: soybean meal adhesive, epoxidized natural rubber, strengthening and toughening, wet shear strength, double crosslinked network

中图分类号:

TQ432

刘晓蓉,俞振宇,王开立,董友明,李延军,詹先旭,李建章. 环氧化天然橡胶对豆粕胶黏剂性能的影响[J]. 林业科学, 2024, 60(6): 128-135.

Xiaorong Liu,Zhenyu Yu,Kaili Wang,Youming Dong,Yanjun Li,Xianxu Zhan,Jianzhang Li. Effect of Epoxidized Natural Rubber on the Performance of Soybean Meal Adhesives[J]. Scientia Silvae Sinicae, 2024, 60(6): 128-135.

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试样Sample	T_max1^a/℃	T_max2/℃	T_max3/℃	T_10%^b/℃	T_30%/℃	T_50%/℃
SM	58.33	235.47	307.20	228.38	291.17	332.69
SMP	59.37	225.59	330.73	230.98	302.35	343.12
SMP/ER-30	55.08	224.29	331.76	230.40	301.55	342.69
SMP-ER-40	58.20	225.07	331.63	230.58	302.48	343.48
SMP-ER-50	63.79	225.48	331.51	230.66	303.46	344.91
SM/ER-50	57.29	252.36	305.64	226.79	290.36	333.37

试样Sample	T_d1/°C	ΔH/(J·g^?1)	T_p/°C	T_d2/°C
SM	101.99	133.92	169.13	204.66
SMP	91.86	134.76	166.68	200.06
SMP/ER-30	97.32	129.36	172.36	199.52
SMP-ER-40	94.75	136.13	169.02	197.08
SMP-ER-50	106.33	147.29	181.99	193.03
SM/ER-50	98.73	144.15	167.28	203.58

原材料Materials	SM	水Water	PTGE	ER-50
价格Cost（yuan·t^?1）	2800	2.8	40000	25000