Analysis of the causes of AKD sizing system on adverse sizing of the surface of the recycled paper

doi:10.16085/j.issn.1000-6613.2020-2397

Abstract

Abstract:

Aiming at the quality problem that the water resistance of alkyl ketene dimer (AKD) surface sizing recycled paper is not significantly improved in the actual paper making project of a paper mill, the paper samples of AKD sizing produced by paper mill were characterized by contact angle, infrared spectra (FTIR), thermogravimetry (TG), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy spectrum (EDS) research methods. The results show that the change in paper-like contact angle shows two-sided difference, the initial contact angle of the positive surface of the sizing paper is 114.5°, and the reverse surface is 118.5°, the positive urban wetting contact angle (≥90°) is less than 9 minutes, and the negative direction is 9 minutes. The paper sample does not have long-lasting water resistance, and the contribution of the AKD sizing system on the long-acting water resistance of paper is not obvious. After the application, the AKD feature functional group β-vinyl propyl lactone disappears, the weight loss behavior of the sizing paper sample and the sizing extraction paper sample were different in different atmosphere, the atomic composition and the atomic valence chemical environment are different. The sizing paper sample contained soluble substance that could be extracted by tetrahydrofuran (THF) (AKD hydrolysate ketone), and the relative content of the hydrolysate ketone was higher than 99%. The main reason for the adverse sizing of AKD is the improper compatibility of sizing system, which leads to the shortage of long-term water-resistant products in the esterification grafting reaction of AKD and cellulose.

Key words: paper chemicals, alkyl ketene dimer sizing agent, surface sizing, recycled paper, water resistance of paper, adverse sizing

摘要：

针对某造纸厂再生纸抄造工程实际中，烷基烯酮二聚体（AKD）表面施胶挂面再生纸耐水性能提高不明显的质量问题，采用接触角、红外光谱（FTIR）、热重（TG）、X射线光电子能谱技术（XPS）、扫描电镜（SEM）、能谱（EDS）等研究方法，对纸厂生产的AKD施胶挂面再生纸纸样进行表征研究。结果表明，纸样接触角变化表现两面性差异，施胶纸样正面初期接触角为114.5°，反面初期接触角为118.5°，正面临界润湿接触角（≥90°）时间不足9min，反面临界润湿接触角为9min，纸样不具备长效耐水性，AKD施胶体系对纸张长效耐水性的贡献不明显；施胶后AKD特征官能团β-乙烯基丙内酯消失，施胶纸样和施胶萃取纸样在不同氛围下的失重行为不同，原子组成和原子价态化学环境不同，施胶纸样中含有可被四氢呋喃（THF）抽出的可溶物（AKD水解产物酮），水解产物酮相对含量高于99.0%。AKD不良施胶的主要原因在于施胶体系配伍不当，导致AKD与纤维素酯化接枝反应的具有长效耐水产物的量不足。

关键词: 造纸化学品, 烷基烯酮二聚体施胶剂, 表面施胶, 挂面再生纸, 纸张耐水性, 不良施胶

CLC Number:

TS753.9

LI Ting, CUI Jinfeng, GUO Runlan, DU Shaohui, YU Le, WANG Zhenjun, LI Hulin, YAN Yinpeng. Analysis of the causes of AKD sizing system on adverse sizing of the surface of the recycled paper[J]. Chemical Industry and Engineering Progress, 2021, 40(S1): 357-365.

李婷, 崔锦峰, 郭润兰, 杜少辉, 于乐, 王振军, 李虎林, 阎银鹏. 烷基烯酮二聚体施胶体系对挂面再生纸表面不良施胶的成因剖析[J]. 化工进展, 2021, 40(S1): 357-365.

Figures/Tables 12

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耐水时间/min	施胶		施胶萃取
耐水时间/min	正面	反面	正面	反面
0	114.5°	118.5°	102.3°	112.7°
3	109.4°	111.5°	96.6°	108.9°
6	97.1°	105.3°	93.7°	102.4°
9	69.8°	93.7°	77.6°	89.9°
12	31.3°	84.6°	42.8°	81.1°
15	0°	77.6°	0°	60.0°

耐水时间/min	施胶		施胶萃取
耐水时间/min	正面	反面	正面	反面
0	114.5°	118.5°	102.3°	112.7°
3	109.4°	111.5°	96.6°	108.9°
6	97.1°	105.3°	93.7°	102.4°
9	69.8°	93.7°	77.6°	89.9°
12	31.3°	84.6°	42.8°	81.1°
15	0°	77.6°	0°	60.0°

纸样	谱峰	结合能/eV	面积/cps×10^-4	灵敏度因子	相对原子质量	原子摩尔分数/%	元素质量分数/%
未施胶	C1s	285.00	32078.60	0.28	12.01	64.74	56.84
	O1s	532.00	43123.76	0.72	16.00	33.84	39.59
	S2p	169.00	168.81	0.58	32.06	0.17	0.39
	Al2p	72.00	0	0.18	26.98	0	0
	Si2p	102.00	257.80	0.27	28.09	0.54	1.11
	Ca2p	348.00	1167.04	0.93	40.08	0.71	3.07
未施胶萃取	C1s	285.00	44178.57	0.28	12.01	61.32	53.23
	O1s	532.00	68178.62	0.72	16.00	37.2	43.17
	S2p	169.00	0	0.58	32.06	0	0
	Al2p	72.00	0	0.18	26.98	0	0
	Si2p	102.00	679.84	0.27	28.09	0.98	1.99
	Ca2p	348.00	1190.16	0.93	40.08	0.5	1.44
施胶	C1s	285.00	35831.42	0.28	12.01	64.13	56.38
	O1s	532.00	49397.33	0.72	16.00	34.38	40.27
	S2p	169.00	57.73	0.58	32.06	0.05	0.12
	Al2p	72.00	189.18	0.18	26.98	0.53	1.04
	Si2p	102.00	301.13	0.27	28.09	0.56	1.15
	Ca2p	348.00	1655.89	0.93	40.08	0.35	1.04
施胶萃取	C1s	285.00	26299.03	0.28	12.01	58.64	49.07
	O1s	532.00	41821.56	0.72	16.00	36.27	40.42
	S2p	169.00	0	0.58	32.06	0	0
	Al2p	72.00	165.04	0.18	26.98	0.57	1.08
	Si2p	102.00	1640.97	0.27	28.09	3.8	7.43
	Ca2p	348.00	1071.41	0.93	40.08	0.72	2.0

纸样	谱峰	结合能/eV	面积/cps×10^-4	灵敏度因子	相对原子质量	原子摩尔分数/%	元素质量分数/%
未施胶	C1s	285.00	32078.60	0.28	12.01	64.74	56.84
	O1s	532.00	43123.76	0.72	16.00	33.84	39.59
	S2p	169.00	168.81	0.58	32.06	0.17	0.39
	Al2p	72.00	0	0.18	26.98	0	0
	Si2p	102.00	257.80	0.27	28.09	0.54	1.11
	Ca2p	348.00	1167.04	0.93	40.08	0.71	3.07
未施胶萃取	C1s	285.00	44178.57	0.28	12.01	61.32	53.23
	O1s	532.00	68178.62	0.72	16.00	37.2	43.17
	S2p	169.00	0	0.58	32.06	0	0
	Al2p	72.00	0	0.18	26.98	0	0
	Si2p	102.00	679.84	0.27	28.09	0.98	1.99
	Ca2p	348.00	1190.16	0.93	40.08	0.5	1.44
施胶	C1s	285.00	35831.42	0.28	12.01	64.13	56.38
	O1s	532.00	49397.33	0.72	16.00	34.38	40.27
	S2p	169.00	57.73	0.58	32.06	0.05	0.12
	Al2p	72.00	189.18	0.18	26.98	0.53	1.04
	Si2p	102.00	301.13	0.27	28.09	0.56	1.15
	Ca2p	348.00	1655.89	0.93	40.08	0.35	1.04
施胶萃取	C1s	285.00	26299.03	0.28	12.01	58.64	49.07
	O1s	532.00	41821.56	0.72	16.00	36.27	40.42
	S2p	169.00	0	0.58	32.06	0	0
	Al2p	72.00	165.04	0.18	26.98	0.57	1.08
	Si2p	102.00	1640.97	0.27	28.09	3.8	7.43
	Ca2p	348.00	1071.41	0.93	40.08	0.72	2.0

纸样	碳化物面积/%	C—C/H 面积/%	C—OH/C—O—C面积/%	C=O 面积/%	O—C=O面积/%
未施胶	32.47	44.33	20.61	0	2.59
未施胶萃取	33.19	47.78	16.55	0	2.48
施胶	38.95	46.29	10.65	3.73	0.38
施胶萃取	35.20	42.57	19.74	0	2.49