JOURNAL OF TEXTILE RESEARCH ›› 2017, Vol. 38 ›› Issue (11): 68-72.doi: 10.13475/j.fzxb.20170300405

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Preparation and properties of acetoacetylated starch used as sizing agent

  

  • Received:2017-03-03 Revised:2017-06-11 Online:2017-11-15 Published:2017-11-15

Abstract:

In order to make up for the lack of natural starch used as sizing agent in properties, a series of acetoacetylated starches (AASs) with different degree of substitution were prepared by changing the weight ratio of diketene to acid-thinned starch (ATS). The viscosity of sizing liquor, mechanical properties of sizing film, adhesion properties and sizing properties of AAS were studied. The results showed that esterifying modification of acetoacetate is capable of enhancing the mechanical properties of starch sizing film, enhancing the adhesion to fibers. When the degree of substitution is in a range of 0.014 - 0.085, with the increase in the degree of modification, the breaking elongation of AAS film and the adhesion to fibers first increase and then reduce, the tensile strength of AAS film first reduces and then increases. When the degree of substitution is 0.056, the breaking elongation of AAS film reaches the maximum value of 3.88%, the adhesion to polyester fibers and cotton fibers reaches the maximum value of 137.54 N and 69.32 N respectively. The suitable degree of substitution is 0.028-0.071 when AAS is used as sizing agent. Compared with ATS, AAS can further enhance the sizing properties of 13 tex polyyester/cotton ( 65/35) warp yarn.

Key words: acetoacetylated starch, size liquor, substitution degree, sizing film, adhesion property

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