A kind of natural plant-based regenerated cellulose coated paper for food packaging and its preparation method and application
A technology for regenerated cellulose and food packaging, applied in the directions of wrapping paper, wrapping paper, packaging, etc., can solve the problems of poor waterproof and oil-proof performance, insufficient physical performance, etc., and achieve improved ink absorption performance, improved physical performance, and good waterproof performance. Effect
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Embodiment 1
[0049] A preparation method of natural plant-based regenerated cellulose coated paper for food packaging, comprising the following steps:
[0050] S1. Dissolving pulp: after dissolving the pre-hydrolyzed sulfate dissolving pulp of softwood with a beating degree of 55°SR and a lignin content of less than 0.2%, the mass concentration of the sodium hydroxide solution is 8%, and the pulp concentration is 7%. After alkaline hydrolysis treatment at 110°C for 40min, washing to neutrality, a dissolving pulp with α-cellulose content of 96% and a degree of polymerization of 1100 was obtained;
[0051] S2. Regenerated cellulose: take the dissolving pulp with α cellulose content of 95% and polymerization degree of 1100, mix and dissolve it with N-methylmorpholine-N-oxide aqueous solution with a concentration of 88-90%, and wash with water Then the regenerated cellulose suspension is obtained; the ratio of the dissolving pulp to the N-methylmorpholine-N-oxide aqueous solution is 14g:86L; t...
Embodiment 2～3
[0057] The preparation steps of the natural plant-based regenerated cellulose coated paper for food packaging of Examples 2 to 3 are the same as those of Example 1, except that the following process conditions are as follows, see Table 1 for details, and the prepared coated paper is related to performance testing.
[0058] Table 1
[0059] Example 2 Example 3 Beating degree °SR 50 60 Alpha cellulose content 96％ 94％ degree of aggregation 1000 1200 NMMO aqueous solution concentration 88％ 90％ Dissolving slurry: NMMO aqueous solution 14g: 86L 15g: 85L Reactor process 108℃，3h 105℃，4h Mass ratio of citrate starch to regenerated cellulose in S2 62:38 67:33 The amount of glycerol and citric acid in S2 10％ 15％ The amount of glue applied to one side in S2 is g / m 2
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