White cardboard for food packaging and its production process
A technology of food packaging and production technology, applied in the field of white cardboard, can solve the problems of high anti-counterfeiting cost of ordinary white cardboard, no waterproof performance of white cardboard, inconvenient use process, etc., achieve high toughness, eliminate the problem of bacterial flow and reproduction Possibility, easy molding effect
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preparation example 1
[0044] Modified PET polyester fibers are made by the following methods:
[0045] (1) 30%wt nano titanium nitride is dispersed in ethylene glycol, terephthalic acid and antimony trioxide are mixed uniformly and then added to the polymerization kettle. The mass ratio of ethylene glycol, terephthalic acid and antimony trioxide is The ratio is 1:2.75:0.02, the polymerization kettle is sealed and then pressurized to 0.25MPa, heated to 250℃, the stirring speed is 100r / min, and the esterification reaction is performed for 1.5h to obtain the intermediate product;
[0046] (2) performing polycondensation treatment on the intermediate product, raising the vacuum degree to 20MPa, controlling the temperature at 270°C, adjusting the stirring speed to 240r / min, and reacting for 1.5h to obtain the nano-titanium nitride / PET polycondensate;
[0047] (3) Adjust the pressure back to normal pressure, adjust the temperature to 50° C., adjust the stirring speed to 130 r / min, and add polybutyl acryl...
Embodiment 1
[0050] The production process of white cardboard for food packaging. The white cardboard includes the bottom layer and the waterproof film. The production process of the white cardboard includes the following steps:
[0051] S1, prepare the toughening component, weigh the required weight parts in proportion, mix 60 parts of polyvinyl alcohol, 10 parts of n-butyl isocyanate acetate, 1 part of titanium tert-butoxide, 90 parts of modified PET polymer Ester fiber, 0.5 part of cetyltrimethylsilver ammonium bromide, 2 parts of sodium methylenebismethylbenzenesulfonate, 3 parts of o-hydroxyacetophenone and 0.4 part of zinc glutarate, stir and mix well, Preparation of toughening components for use;
[0052] S2. Preparation of bottom layer: the bottom layer is obtained by using 60 parts of bleached hardwood kraft pulp chemical softwood pulp and 15 parts of bleached softwood kraft pulp of the bottom layer after beating, adding 40 parts of toughening components, and sending it to the bot...
Embodiment 2
[0056] The production process of white cardboard for food packaging. The white cardboard includes the bottom layer and the waterproof film. The production process of the white cardboard includes the following steps:
[0057] S1, prepare the toughening component, weigh the required weight parts in proportion, mix 80 parts of polyvinyl alcohol, 12 parts of n-butyl isocyanate acetate, 2 parts of titanium tert-butoxide, 100 parts of modified PET polymer Ester fiber, 1 part cetyltrimethylsilver ammonium bromide, 5 parts sodium methylene bismethylbenzene sulfonate, 4 parts o-hydroxyacetophenone and 0.5 part zinc glutarate, stir and mix well, Preparation of toughening components for use;
[0058] S2. Preparation of bottom layer: the bottom layer is obtained by using 60 parts of bleached hardwood kraft pulp chemical softwood pulp and 15 parts of bleached softwood kraft pulp of the bottom layer after beating, adding 40 parts of toughening components, and sending it to the bottom net fo...
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