Degradable polymer composite material, preparation method and food packaging film
A food packaging film and composite material technology, applied in the fields of preparation, food packaging film, and degradable polymer composite materials, can solve the problems of incomplete degradation of degradable plastics, difficulty in degradation, and aggravating the difficulty of recycling waste plastics, etc., to achieve Excellent biodegradability and cost reduction effect
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Examples
Embodiment 1
[0042] In Example 1, the effect of the addition amount of sodium carboxymethyl cellulose and polystyrene on the performance of the filling layer was studied.
[0043] Mix polyvinyl alcohol with sodium carboxymethyl cellulose and polystyrene according to the ratio in Table 1 to obtain a degradable composite resin, and blow mold the degradable composite resin to obtain degradable PVA composite sheet samples 1 to 1 respectively. 6.
[0044] Table 1
[0045]
[0046] The degradable PVA composite sheet samples 1-6 were tested as follows.
[0047] Mechanical property test
[0048] The test of mechanical properties is carried out according to the GB / T1040-1992 standard. The strip-shaped standard sample with a size of 150mm×10mm×0.4mm is placed under constant temperature and humidity conditions for 5 days, and then the tensile test is carried out with a universal electronic tensile machine. The tensile rate 10mm / min, test the tensile strength and elongation at break, and take th...
Embodiment 2
[0068] In Example 2, the effect of the addition amount of polyhydroxyheptanoate on the performance of the outer layer was studied.
[0069] Use a plastic extrusion casting machine, mix polypropylene and polyhydroxyheptanoate, and process separately according to the mixing ratio in Table 3. The processing temperature is: extruder 120-200 °C, head 180-200 °C, extrude Processed into degradable CPP film samples 1 to 5 with a thickness of 30 μm.
[0070] table 3
[0071]
[0072]
[0073] The following tests were performed on the CPP film samples 1 to 5.
[0074] Mechanical property test
[0075] The test of mechanical properties is carried out according to the GB / T1040-1992 standard. The strip-shaped standard sample with a size of 150mm×10mm×0.4mm is placed under constant temperature and humidity conditions for 5 days, and then the tensile test is carried out with a universal electronic tensile machine. The tensile rate 10mm / min, test the tensile strength and elongation a...
Embodiment 3
[0090] In Example 3, the effect of the addition amount of polyhydroxyheptanoate and vinyl acetate on the performance of the inner layer was studied.
[0091]Mix polyethylene with polyhydroxyheptanate and vinyl acetate according to the ratio in Table 5, and then extrude and tape-cast to obtain degradable PE film samples 1-10.
[0092] table 5
[0093]
[0094]
[0095] The PE film samples 1-10 were tested as follows.
[0096] Mechanical property test
[0097] The test of mechanical properties is carried out according to the GB / T1040-1992 standard. The strip-shaped standard sample with a size of 150mm×10mm×0.4mm is placed under constant temperature and humidity conditions for 5 days, and then the tensile test is carried out with a universal electronic tensile machine. The tensile rate 10mm / min, test the tensile strength and elongation at break, and take the average value of 5 samples.
[0098] Degradability test
[0099] The test of degradation rate is carried out acco...
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