Microspherical highly hydrophobic starch and its preparation method and application
A technology of high hydrophobicity and starch, which is applied in the field of microsphere type high hydrophobic starch and its preparation, can solve the problems of affecting the compatibility of synthetic resins, high energy consumption, low energy consumption, etc., and achieves simple process, energy saving, environmental protection and low energy consumption. , the effect of increasing the specific surface area, easy dispersion and mutual compatibility
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Embodiment 1
[0031] Step 1: Prepare dry starch: dry corn starch at 150°C for 1.5 hours;
[0032] The second step: preparing micronized starch: take 100 mass parts of dried cornstarch in an ultrasonic oscillator, frequency 60KHz, room temperature, ultrasonic oscillation for 2 hours;
[0033]Step 3: Preparation of highly hydrophobic starch: transfer 100 parts by mass of the micronized starch above to a high-speed mixer: stir at 3000 rpm, add 0.5 parts by mass of peanut acidified oil, and stir at 80° C. for 0.5 h. 3000 rpm, add 1 mass part of swill waste oil, and stir at 80°C for 0.5h. Dry at 150°C for 2 hours to obtain microspherical highly hydrophobic starch.
[0034] Unrefined corn starch granules are irregularly arranged and agglomerated into lumps (see figure 2 ), while microspherical highly hydrophobic jade
[0035] The agglomeration phenomenon of rice starch disappeared obviously, the particles became smaller and evenly arranged, and the surface showed a bright hydrophobic layer (s...
Embodiment 2
[0038] Step 1: Prepare dry starch: dry wheat starch at 120°C for 3 hours;
[0039] The second step: prepare micronized starch: take 100 mass points of dried wheat starch in an ultrasonic oscillator, 80KHz,
[0040] At room temperature, ultrasonic oscillation for 1h;
[0041] The third step: preparing starch with a surface hydrophobic layer: transfer the above-mentioned 100 parts by mass of micronized starch to a high-speed mixer. Under stirring at 2500 rpm, at 60°C, add 1 mass part of soy acidified oil, and stir for 1 hour. Under stirring at 2500 rpm, add 0.5 mass fraction of lard waste oil, and stir at 60°C for 1 hour. Dry at 120°C for 3 hours to obtain microspherical highly hydrophobic starch.
[0042] The particle size of unmodified wheat starch is mostly distributed between 5 and 12 microns, and the contact angle is about 20°. The modified wheat starch
[0043] The particle size is mostly distributed between 0.1 and 3 microns, and the contact angle is 154°.
Embodiment 3
[0045] The first step: preparing dry starch: drying potato starch at 100°C for 4 hours;
[0046] The second step: preparing micronized starch: take 100 parts by mass of dried potato starch in an ultrasonic oscillator, 100KHz, room temperature, ultrasonic oscillation for 1h;
[0047] Step 3: Preparation of starch with a surface hydrophobic layer: transfer the above 100 mass fractions of micronized potato starch to a high-speed mixer, stir at 2000 rpm, and add 0.8 mass fractions of rapeseed acidified oil / sunflower acidified oil at 40°C (1 / 1 mass ratio), stirring for 2h. Under stirring at 2000 rpm, at 40°C, add 0.7 parts by mass of vegetable oil waste oil, and stir for 2 hours.
[0048] Dry at 110°C for 4 hours to obtain microspherical highly hydrophobic potato starch.
[0049] The particle size of unmodified potato starch is mostly distributed in 25-39 microns, and the contact angle is about 5°. The particle size of modified potato starch is mostly distributed in 5-8 microns, ...
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