Anti-mold Coating Of Starch-based Materials Research

China is a starch producing countries, are produced a large number of starch products each year. So that the starch was a wide variety of sources, low price and has the dvantages of a renewable and biodegradable materials, which are used in many industries widely. The prevalence of the use of starch coating materials has become a trend in the future. However, starch coating material has its own shortcomings, likely to be used by micro-organisms, mildew and rot, which will destroy the starch-based coating material of the original performance. Preventing Starch-based coating material to mildew is now an urgent problem.Sloving this problem can improve the utilization of starch-based coating material, so that starch-based coating material has broad application prospects.In this paper, contrast resistant starch on the original mold and mildew resistant starch, regular observation, selected the best mildew resistant starch. Then by adding a preservative antifungal agent in the starch medium, selected the best materials to prevent mold starch-based coating formulations. Finally, the coating applied to fruit and vegetable preservation, and interior paint. The results were as follows:1. The experiment shows, the concentration of 10% compared to 5% starch solution have a greater generation gap, the concentration of water loss rate of starch solution in general larger, so it is not conducive to doing film material. The concentration of 5% film-forming starch solution is relatively good, the choice the 5% concentration of native starch coating. The concentration of 5% original starch coating material advantages and disadvantages of anti-mildew properties as follows:sweet potato starch, pea starch mold which the most serious. Among them, the most serious moldy was sweet potato starch, followed by the pea starch; then was corn starch, potato starch, cassava starch. Mildew resistant starch in the original was 3 days.2. The experimental results show that the anti-mildew properties of modified starch is the best carboxymethyl starch. Carboxymethyl starch was less prone to mildew at room temperature and culture twenty-one days. It still does not mildew until the conclusion of medium evaporation.3. Starch-based materials mildew spoilage film, the main growth out of the mold is Penicillium, Mucor, BlackBerry, Aspergillus, Rhizopus.4. Coating applications in fruits and vegetables, strawberry carboxymethyl potato on the film. The concentration of 1.50% carboxymethyl potato coating materials inhibition of strawberry mildew and rot was the best by coating the concentration of five different compared with the control group, the decay rate was 12.5% in the sixth day.5. Additing the appropriate antimicrobial agent in the mold coating materials, coating materials to prevent mildew on the effect of a greatly improved. Balm in fruits and vegetables, add the phytic acid and sodium acetate as preservatives dehydrogenation when compared with the control group, the effect is increased, the effect of sodium acetate dehydrogenation obvious. Add dehydrogenation of sodium acetate concentration of 0.05% of the coating solution, the smallest weight loss, weight loss rate was 14.68% in the sixth day. Decay rate of 0 in the fourth day. In the sixth day, the decay rate is still low, 15.63%. Used Chitosan coating materials and the experimental group as the control film, added 0.05% sodium acetate dehydrogenation of carboxymethyl potato antibacterial and antifungal preservative coating material is better than the control group with chitosan coating.6. The concentration of 5% of the balm from the skin is serious by coating the walls with 5% and 2.5% of carboxymethyl potato starch coating solution. Through experiments, the selected concentration of 2.5% of the concentration of the experimental was plastic wall concentration. To further study the growth of the wall of plastic mold, manufacturing, extreme conditions, observe the situation of the wall plastic mold, mold growth in the most suitable temperature of 250C and humidity of 90%, there is still no mildew phenomenon.