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...

AI Technical Summary

Problems solved by technology

However, starch-based plastics have many shortcomings that are difficult to overcome by themselves.

If the mechanical strength is not enough, it cannot meet the actual application requirements, the water resistance is poor, the performance of the material is greatly affected by the ambient humidity, and it cannot meet its all-weather application conditions, etc.