Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (06): 76-80.doi: 10.13475/j.fzxb.20190904705

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Preparation and sizing properties of caproylated starch

LI Wei1(), JING Yuanwei1, ZHANG Zhengqiao1, NI Qingqing2, XU Zhenzhen1, LIU Xinhua1   

  1. 1. College of Textiles and Garments, Anhui Polytechnic University, Wuhu, Anhui 241000, China
    2. Faculty of Textile Science and Technology, Shinshu University, Nagano 3868567, Japan
  • Received:2019-09-17 Revised:2020-02-28 Online:2020-06-15 Published:2020-06-28

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Abstract:

In order to provide a suitable modified starch for warp sizing of hydrophobic fibers especially for polylactic acid (PLA) fibers, caproylated starch (CS) samples with different degrees of substitution were prepared by using caproic anhydride as esterifying agent. The structure of CS was characterized by Fourier transform infrared analysis. The influence of the caproylation on paste and film properties was investigated. The results show that the caproylation could enhance viscosity stability of gelatinized starch paste, its adhesion to polylactic acid and polyester fibers, and breaking elongation of starch film. In addition, the modification causes decrease in tensile strength of starch film. When the degrees of substitution are below 0.025, the adhesion demonstrats a gradual increase, and it reaches the highest value at 0.025 and then gradually decreases. The elongation of CS film rose gradually but the strength reduced. The stabilities of the CS pastes are worsened as the degree of substitution is increased, but are higher than that of acid-converted corn starch paste.

Key words: starch, sizing agent, caproylation, adhesion, film property, sizing property

CLC Number: 

  • TS103.846

Fig.1

Reaction equation of starch caproylation for synthesis of CS"

Fig.2

FT-IR spectra of ACS and CS"

Fig.3

SEM image of CS sample(×2 000)"

Fig.4

Viscosity and its stability of gelatinized CS paste"

Fig.5

Effect of caproylation on adhesion of starch"

Fig.6

Effect of caproylation on surface tension of cooked starch paste"

Fig.7

Effect of caproylation on tensile properties of starch film"

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