Application of nano zinc oxide aqueous dispersion in textile sizing

  Application of nano zinc oxide aqueous dispersion in textile sizing
 
 
Textile size is an indispensable polymer material in the process of textile production

 
In recent years, starch size accounts for about 70% of the textile size we consume every year, PVA size accounts for about 20%, and polyacrylic acid (ester) size is about 10%。
 
 
PVA slurry has excellent film-forming, adhesion and compatibility with other materials
However, PVA has high COD value (oxygen consumption) and poor solubility, so it needs to be cooked at high temperature 2〜 3 hours, time-consuming and energy consuming; The fluidity of the slurry is very poor, the adhesion is insufficient, it is easy to crust and form slurry spots, and it is difficult to desize
A large amount of PVA enters rivers and lakes with desizing wastewater, polluting the water ecological environment

 
 
The starch mixed size modified by nano zinc oxide dispersion partially replaces PVA and reduces the amount of PVA used for pure cotton yarn sizing, so as to solve the problem that it is difficult to weave without or less PVA for pure cotton warp sizing, so as to solve the related environmental problems

 
Effect of adding nano zinc oxide dispersion on slurry viscosity
The viscosity of nano size is much lower than that of conventional size
Although the decrease of PVA content is a factor of viscosity reduction, the decrease of a small amount of PVA will not greatly change the viscosity properties of the size
Moreover, due to the same concentration, the amount of starch is increased while reducing the content of PVA
The amount of starch in nano size is higher than that of conventional formula, The viscosity is lower than the conventional formula, indicating that one of the main reasons for the decrease of viscosity is the addition of nanoparticles

 
 
Comparison of slurry adhesion
Compared with the conventional slurry formula, the breaking strength of nano formula is better than that of conventional formula, and the strength is also improved a lot, This is because the viscosity is also a factor affecting the adhesion
If the viscosity of the slurry is low, the fluidity of the slurry is good, which is conducive to spreading the fiber, forming close contact at the molecular level and improving the adhesion strength

 
 
 
 
Comparison of yarn hairiness index
The main purpose of yarn sizing is to lay down hairiness
If there are many hairiness, the yarns are easy to tangle with each other

 
The sizing of nano size plays a great role in the lodging of hairiness
It is better when the amount of nano zinc oxide aqueous dispersion is 2
5%
(the content of nano zinc oxide dispersion is 5%)
 
Comparison of yarn wear resistance
Nano size has good wear-resistant effect
The three indexes of hairiness and wear-resistant are better than the conventional formula, so the sizing performance of nano size is better than the conventional formula
Under the condition of greatly reducing PVA, the slurry performance is similar or even better by adding nano inorganic nanoparticles

 
In the nano slurry, the nano zinc oxide dispersion (content 5%) was added with 2
5%, PVA 50% (25% less than the conventional formula) formula has better sizing performance than other nano formulas