Method for preparing granules of copolymer of ethylene - vinyl alcohol
A technology of vinyl alcohol copolymer and ethylene, applied in the direction of coating, etc., can solve the problems of uneven particle size, breakage of strip precipitates, unstable operation, etc., and achieve the effect of uniform shape and size, and excellent heat resistance
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[0017] According to the method for preparing ethylene-vinyl alcohol copolymer particles according to the present invention, acetic acid and / or phosphate additives can be added to the condensed fluid used to condense the ethylene-vinyl alcohol copolymer to simultaneously improve the ethylene-vinyl alcohol copolymer The heat resistance of the material.
[0018] The present invention also provides an ethylene-vinyl alcohol copolymer particle, which is prepared by the method of the present invention, wherein the particle shape is such that the track formed by any connection point on the particle surface is arc-shaped, and the overall surface of the particle is A curved surface.
[0019] In the present invention, "the overall surface of the particle is a curved surface" means that there is no obvious adjacent boundary between the surface and the surface on the surface of the particle, for example, it can be spherical, elongated, elliptical, and teardrop-shaped. .
[0020] In the method...
Embodiment 1
[0040] The ethylene-vinyl acetate copolymer (EVOAc) with an ethylene content of 32 mol% is saponified to become an ethylene-vinyl alcohol copolymer (EVOH) with a saponification degree greater than 99.5 mol%, which is dissolved in methanol and water. In the mixed solution, the weight percentage of methanol and water is 70:30, and the weight percentage of EVOH in the dissolved solution is 39%. The EVOH solution is stored in a storage tank, and the temperature of the solution is maintained at 60° C. as the feed source of the granulation system used in the subsequent method of the present invention.
[0041] The aforementioned EVOH solution was transported to the feed pipe via a gear pump at a speed of 100 liters / min, and the EVOH solution was passed through a die with 8 die holes and a diameter of 2.8 mm, and the temperature of the die was controlled at 70°C. After passing through the die, the EVOH solution is immediately cut by a cutter with a rotating speed of 1500 rpm, and then pa...
Embodiment 2
[0044] Except that the weight percentage of EVOH contained in the EVOH solution is 44%, the preparation method of the rest of the EVOH particles and the calculation of the shape factor S value are the same as in Example 1.
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