Polyvinylidene chloride (PVDC)-based composite having core-shell structure and method for manufacturing same
The present invention relates to a polyvinylidene chloride (PVDC)-based composite and a method for preparing the same. The PVDC-based composite includes a core including a PVDC-based polymer; and a shell surrounding the core and including wax. The wax is nano-sized particles.
1 . A polyvinylidene chloride (PVDC)-based composite comprising:
a core comprising a PVDC-based polymer; and
a shell surrounding the core and comprising wax,
wherein the wax is nano-sized particles.
2 . The PVDC-based composite of claim 1 , wherein a particle size of the wax is 30 to 280 nm.
3 . The PVDC-based composite of claim 1 , wherein the wax is one or more selected from the group consisting of petroleum/coal-derived wax extracted from petroleum or coal, animal and vegetable wax, amide-based synthetic wax, olefin-based synthetic wax, organosilicon polymer wax, and modified wax thereof.
4 . The PVDC-based composite of claim 3 , wherein the wax is two or more types of wax including acrylic wax.
5 . The PVDC-based composite of claim 1 , wherein a thickness of the shell is 30 nm to 10 μm.
6 . The PVDC-based composite of claim 1 , wherein the PVDC-based polymer is one or more selected from the group consisting of a homopolymer and a copolymer that comprise vinylidene chloride (VDC).
7 . The PVDC-based composite of claim 6 , wherein the PVDC-based polymer is a copolymer comprising one or more comonomers selected from the group consisting of vinyl chloride (VC) and methyl acrylate (MA).
8 . The PVDC-based composite of claim 7 , wherein the PVDC-based polymer comprises 2 to 25 wt % of the comonomers.
9 . The PVDC-based composite of claim 1 , wherein the core is a spherical particle having a size of 150 to 350 μm.
10 . The PVDC-based composite of claim 1 , wherein an angle of repose of a powder comprising a plurality of PVDC-based composites is 28 or less.
11 . The PVDC-based composite of claim 10 , wherein the PVDC-based composite further satisfies the following Relational Expression 1:
0.8< B/A< 0.92 [Relational Expression 1]
in Relational Expression 1, A is an angle of repose of a powder comprising a plurality of PVDC-based polymer particles that do not comprise the shell, and B is an angle of repose of a powder comprising a plurality of PVDC-based composites.
12 . A method for preparing a polyvinylidene chloride (PVDC)-based composite, the method comprising the steps of:
a) preparing a first mixed solution comprising a PVDC-based polymer;
b) preparing a second mixed solution by adding wax to the first mixed solution; and
c) drying the second mixed solution,
wherein the wax is nano-sized particles.
13 . The method of claim 12 , wherein the wax is two or more types of wax including acrylic wax.
14 . The method of claim 13 , wherein step c) is performed at a temperature higher than a glass transition temperature (Tg) of the acrylic wax.
15 . The method of claim 12 , wherein a temperature in the drying is 80 to 140° C.
16 . A food packaging film comprising the PVDC-based composite of claim 1 .