Preparation method of degradable food fresh-keeping bag taking fish scale gelatin as matrix

Abstract

The invention discloses a preparation method of a degradable food fresh-keeping bag taking fish scale gelatin as a matrix. The invention is prepared from the following components in parts by weight: 15 to 20 parts of fresh water scale gelatin, 25 to 35 parts of polyvinyl alcohol, 10 to 15 parts of calcium carbonate, 15 to 25 parts of lignocellulose aerogel, 5 to 10 parts of antioxidant, 10 to 15 parts of glycerinum and 5 to 10 parts of chitosan. Preparation of a solution includes mixing polyvinyl alcohol and deionized water in a mass ratio of 1: 1 to form a solution; then sequentially adding gelatin, lignocellulose aerogel, and calcium carbonate, and evenly mixing; carrying out ultrasonic treatment for 15 minutes, putting the mixed solution into a high-temperature steam oven at 110-120 DEGC, carrying out hot steam treatment, adding the antioxidant, glycerol and chitosan again, uniformly stirring, homogenizing for 2-3 times by using a microjet homogenizer (220-30MPa), finally putting the material into an extruder, and pressing to form a film. The degradation degree of the fish scale gelatin matrix food fresh-keeping bag within 50 days is greater than 30%. The invention can providea food plastic fresh-keeping bag with good degradability, antibiosis and antioxidation.

Description

technical field

[0001] The invention belongs to the technical field of aquatic product processing, and in particular relates to a degradable food plastic fresh-keeping bag with fish scale gelatin as the matrix and a manufacturing method thereof. Background technique

[0002] At present, the annual consumption of plastics in the world is 240 million tons, with an annual growth rate of about 4%. China's annual consumption of plastics is more than 40 million tons, and it will continue to grow at an average rate of at least 8% in the next few years. However, only a small percentage of plastics are recyclable or compostable. At present, most of the research on degradable plastics focuses on starch modification, and the research on protein-based plastics is relatively less. However, starch-based plastics have many shortcomings that are difficult to overcome by themselves. For example, the mechanical strength is not enough to meet the actual application requirements, the water re...