Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (04): 93-100.doi: 10.13475/j.fzxb.20200400208

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Preparation and properties of succinic anhydride acylated gelatin sizing agent for wool yarn sizing

YANG Wenjing1, WU Hailiang1(), MA Jianhua2,3, YAO Yijun1, SHEN Yanqin1   

  1. 1. School of Textile Science and Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, China
    2. School of Materials Science and Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, China
    3. Shaoxing Keqiao West-Tex Textile Industry Innovative Institute, Shaoxing, Zhejiang 312030, China
  • Received:2020-04-01 Revised:2021-01-05 Online:2021-04-15 Published:2021-04-20
  • Contact: WU Hailiang E-mail:whl@xpu.edu.cn

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Abstract:

To address the problems of gelatin gelling at room temperature and poor toughness of size film when gelatin is used to sizing wool yarns, the modified gelatin protein (Gel-C4H4O3) for sizing at room temperature was prepared by acylation of gelatin with succinic anhydride (C4H4O3). The structure and glass transition temperature of Gel-C4H4O3 sizing agent were tested and characterized by infrared spectroscopy, X-ray diffraction, scanning electron microscope and differential scanning calorimeter. The relationship between the acylation degree and the size liquid and membrane properties of Gel-C4H4O3 was systematically studied. The results show that C4H4O3 can react with the amino groups on the gelatin molecular chain. Compared with the existing acrylic, acrylamide or acrylate monomers-grafted gelatin, Gel-C4H4O3 exhibited no gel at room temperature. When the acylation degree is 0.96, Gel-C4H4O3 size liquid showed excellent adhesion to wool yarn and the fracture strength and toughness of Gel-C4H4O3 size membrane are significantly increased. It provides an excellent sizing agent preparation method for wool yarn sizing at room temperature.

Key words: modified gelatin protein sizing agent, wool yarn sizing, acylation degree, size liquid property, size membrane property, succinic anhydride

CLC Number: 

  • TS103.846

Fig.1

Modification mechanism of Gel-C4H4O3 sizing agent"

Fig.2

Infrared spectroscopy of gelatin and Gel-C4H4O3 sizing agent"

Tab.1

Amino acid composition and content of gelatin and Gel-C4H4O3 sizing agent%"

氨基酸种类 氨基酸含量
明胶 Gel-C4H4O3浆料
天冬氨酸(Asp) 6.716 8.121
苏氨酸(Thr) 2.465 2.441
丝氨酸(Ser) 5.465 6.989
谷氨酸(Glu) 15.746 15.311
脯氨酸(Pro) 4.136 4.166
甘氨酸(Gly) 6.046 6.465
丙氨酸(Ala) 4.565 5.798
胱氨酸(Cys) 2.065 2.465
缬氨酸(Val) 6.444 6.426
甲硫氨酸(Met) 2.798 2.793
异亮氨酸(Ile) 3.313 3.465
亮氨酸(Leu) 5.265 7.465
酪氨酸(Tyr) 4.999 5.444
苯丙氨酸(Phe) 6.124 6.989
赖氨酸(Lys) 2.999 1.835
组氨酸(His) 2.466 2.311
精氨酸(Arg) 7.456 6.591

Fig.3

Effect of mass ratio of C4H4O3 and gelatin on acylation degree"

Fig.4

Rheological properties of gelatin and Gel-C4H4O3 size liquid with different acylation degrees. (a)Gelatin;(b) Acylation degree is 0.43; (c) Acylation degree is 0.81;(d) Acylation degree is 0.91; (e) Acylation degree is 0.93;(f) Acylation degree is 0.96"

Tab.2

Molecular weight of Gel-C4H4O3 size liquid with different acylation degrees"

酰化度 重均分子量 酰化度 重均分子量
0.43 92 934 0.93 105 436
0.81 93 652 0.96 116 253
0.91 95 943

Fig.5

Viscosity and temperature curves of gelatin and Gel-C4H4O3 size liquid with different acylation degrees"

Fig.6

Effect of acylation degree on adhesion of Gel-C4H4O3 size liquid"

Fig.7

Mechanical properties of gelatin and Gel-C4H4O3 size membrane with different acylation degrees"

Fig.8

DSC spectra of gelatin and Gel-C4H4O3 sizing agent"

Fig.9

X-ray diffraction spectra of gelatin and Gel-C4H4O3 sizing agent"

Fig.10

Cross section morphology of gelatin and Gel-C4H4O3 size membrane with different acylation degree (×5 000). (a) Gelatin; (b)Acylation degree is 0.43; (c) Acylation degree is 0.81; (d)Acylation degree is 0.91; (e)Acylation degree is 0.93; (f) Acylation degree is 0.96"

Fig.11

Contact angle and water soluble time of gelatin and Gel-C4H4O3 size membrane with different acylation degrees"

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