Fruit and vegetable preservative film and preparation method thereof
A technology for preserving freshness of fruits and vegetables and herbs, applied in the field of plastic wrap, can solve problems such as affecting the freshness of food
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preparation example Construction
[0015] The present invention provides a preparation method of antibacterial plastics, comprising: polyvinyl acetate, low-density polyethylene resin, bacteriostatic filler, ethyl acetate, vinyltrimethoxysilane, tricresyl phosphate and the grade KH550 The silane coupling agent is mixed to obtain colloids; the colloids are added to the extruder and extruded to obtain the antibacterial plastic; wherein, the antibacterial filler is composed of herbal plants, chitosan sugar, seaweed fiber, attapulgite, calcium stearate, sodium alginate, montmorillonite, iron stearate and silicon oxide; the extruder includes a feeding section, a middle section and an extruder head connected in sequence , and the working temperature of the extruder is: feeding section 90-100°C, middle section 110-115°C, extruder head 165-175°C.
[0016] In the above technical solution, the mixing conditions can be selected in a wide range, but in order to improve the mixing effect, preferably, the mixing at least meet...
preparation example 1
[0032] The mixture M1 was prepared by stirring and mixing Ophiopogon japonicus, chitosan, seaweed fiber and attapulgite at 3000 rpm for 1.5 h, and heat-treated at 100 °C for 6 h;
[0033] Calcium stearate, sodium alginate, montmorillonite, iron stearate and silicon oxide were added to the mixture M1, stirred and mixed at 3000rpm for 1.5h, heat-treated at 160°C for 2h, dried, ground and sieved to obtain The antibacterial filler is denoted as W1;
[0034] Among them, the weight ratio of Ophiopogon japonicus, chitosan, seaweed fiber, attapulgite, calcium stearate, sodium alginate, montmorillonite, iron stearate and silicon oxide is 100:6:11:5:10: 3:1:1:2.
preparation example 2
[0036] The mixture M1 was prepared by stirring and mixing Folium Folium Folium, chitosan, seaweed fiber and attapulgite at 4000 rpm for 1.2 h, and heat-treating at 105 °C for 5 h;
[0037] Add calcium stearate, sodium alginate, montmorillonite, iron stearate and silicon oxide to the mixture M1, stir and mix at 4000rpm for 1.2h, heat treat at 160°C for 1.5h, dry, grind and sieve Obtain the antibacterial filler, denoted as W2;
[0038] Wherein, the weight ratio of the Folium Folium Folium, chitosan, seaweed fiber, attapulgite, calcium stearate, sodium alginate, montmorillonite, iron stearate and silicon oxide is 100:8:13:10 :13:4:2:2:3.
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