Processing method of disposable lunch box
A disposable, lunch box technology, applied to other household appliances, hollow items, household appliances, etc., can solve the problems of high cost and low output of polylactic acid, and achieve the effect of improving migration resistance, low migration rate, and enhancing binding ability.
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Embodiment 1
[0043] Preparation method of fumaric acid-vinyl acetate copolymer: stir fumaric acid and toluene at 70°C until fumaric acid is completely dissolved, then add vinyl acetate and benzoyl peroxide, and toluene is fumaric acid and acetic acid 1.5wt% of the total mass of vinyl ester, benzoyl peroxide is 1.5wt% of the total mass of fumaric acid and vinyl acetate, continue the constant temperature reaction for 4.0h, then distill the product under reduced pressure to remove toluene, and then wash with absolute ethanol To neutrality, liquid separation, suction filtration after cooling to obtain the final product fumaric acid-vinyl acetate copolymer. The mass ratio of fumaric acid to vinyl acetate was 1:1.4.
[0044] The polylactic acid composition containing polylactic acid and fumaric acid-vinyl acetate copolymer is kneaded and granulated to obtain polylactic acid composition particles, and the kneading temperature is 85° C. for 30 minutes.
Embodiment 2
[0046] The preparation method of styrene-maleic anhydride copolymer is as follows: adding maleic anhydride into a mixed solvent of butyl acetate and n-heptane with a volume ratio of 1:3, stirring under nitrogen protection until it is completely dissolved, and then preheating at 80 °C. Heat for 12min, add 5% of the total monomer weight of azobisisobutyronitrile and 2% of the total monomer weight of 3-mercaptopropionic acid, and start dropwise addition of styrene monomer, complete the dropwise addition within 60min, continue After 3 hours of reaction, it was cooled to room temperature, filtered with suction, and the obtained solid was washed with absolute ethanol and dried to constant weight. Wherein, the material ratio of styrene and maleic anhydride is 1:1; the number average molecular weight of styrene-maleic anhydride copolymer is 5382g / mol
Embodiment 3
[0048] a) place the bagasse with a particle size of 200 meshes in a sodium hydroxide solution with a mass concentration of 17wt% to carry out alkali treatment for 15min, remove small molecular substances, then wash with clean water and dry, and get final product;
[0049] b) The polylactic acid composition containing polylactic acid, bagasse, toughening agent and erucamide is kneaded and granulated to obtain polylactic acid composition particles, and the kneading temperature is 85°C for 30 minutes; 100 parts by weight of the polylactic acid resin, the content of bagasse is 50 parts by weight, the content of toughening agent is 2.0 parts by weight and the content of erucamide is 0.28 parts by weight; the toughening agent is acetyl lemon with a weight ratio of 1:0.12 tributyl acid and Example 1 fumaric acid-vinyl acetate copolymer;
[0050] c) injection molding the polylactic acid composition particles at an injection temperature of 163° C., a pressure of 45 MPa, and a speed of ...
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