I believe that many people are very worried that such problems will occur in EVA products. In fact, EVA appears in home life as the current core material. It often acts as sound insulation material, floor material, buffer material, etc. in decoration projects. EVA material has many advantages as a carpet, for example, good shock resistance, waterproof, anti-electric and so on. So today Gundam Products summarizes the four major reasons for the fading of plastic EVA products: Factors that affect the fading of plastic EVA products. The fading of plastic colored products is related to the light resistance, oxidation resistance, heat resistance, acid and alkali resistance of pigments and dyes and the characteristics of the resin used. According to the processing conditions and use requirements of plastic products, the above properties of the required pigments, dyes, surfactants, dispersants, carrier resins and anti-aging additives should be comprehensively evaluated before the masterbatch can be selected. First, the four major reasons for the fading of plastic EVA products: 1. The fading of acid and alkali resistant colored plastic products is related to the chemical resistance (acid and alkali resistance, redox resistance) of the colorant. For example, molybdenum-chromium red is resistant to dilute acid, but is sensitive to alkali, and cadmium yellow is not acid-resistant. These two kinds of pigments and phenolic resin have a strong reducing effect on some colorants, which seriously affects the heat resistance and weather resistance of the colorant and fades. 2. Antioxidant Some organic pigments will gradually fade due to the degradation of macromolecules or other changes after oxidation. This process is one of high-temperature oxidation during processing, and the other is the oxidation of strong oxidants (such as chromate in chrome yellow). When lakes, azo pigments are mixed with chrome yellow, the red color will gradually decrease. 3. The thermal stability of heat-resistant pigments refers to the degree of thermal weight loss, discoloration and fading of pigments at processing temperature. Inorganic pigments are composed of metal oxides and salts, with good thermal stability and high heat resistance. The pigments of organic compounds will undergo changes in molecular structure and a small amount of decomposition at a certain temperature. Especially for PP, PA, PET products, the processing temperature is above 280 °C. When selecting colorants, on the one hand, we should pay attention to the heat resistance of the pigment, and on the other hand, consider the heat resistance time of the pigment. Usually, the heat resistance time is 4-10rain. . 4. The light resistance of lightfast colorants directly affects the fading of products. For outdoor products exposed to strong light, the light fastness (light fastness) grade requirement of the colorant used is an important indicator. The light fastness grade is poor, and the product will fade quickly during use. The light resistance grade selected for weather-resistant products should not be lower than grade 6, preferably grade 7 or grade 8, and grade 4 or grade 5 for indoor products. The light resistance of the carrier resin also has a great influence on the color change. After the resin is irradiated by ultraviolet rays, its molecular structure changes and the color fades. Adding light stabilizers such as UV absorbers to the masterbatch can improve the light resistance of colorants and colored plastic products. Second: EVA materials usually have the following 6 characteristics 1. Water resistance: closed cell structure, non-absorbent, moisture-proof and water-resistant. 2. Corrosion resistance: It is resistant to corrosion by chemicals such as seawater, grease, acid, and alkali, and is antibacterial, non-toxic, odorless, and non-polluting. 3. Processability: There are no joints, and it is easy to process such as hot pressing, cutting, gluing, and lamination. 4. Anti-vibration: high resilience and tensile strength, high toughness, good shock-proof and buffering performance. 5. Thermal insulation: excellent thermal insulation, thermal insulation and cold protection and low temperature performance, can withstand severe cold and exposure. 6. Sound insulation: closed cells, good sound insulation effect. The four major reasons for the fading of plastic Eva Bag are shared here. Paying attention to the above points can avoid unfavorable factors such as fading of EVA products; due to the advantages of EVA materials, it is currently used more and more widely in daily life. Dongguan Junkai Packaging Products Co., Ltd was established in 2015 and is located in Liaobu Town, Dongguan City, Guangdong Province. Its main business scope: production and sales of various bags. We specialize in the production of Eva Bags, all carefully crafted with high quality ,Waterproof and dustproof. We also have the Diamond Painting Bottle Storage Bag on sale. Although this bag is a storage bag for painting tools, it is also widely used in electronic equipment, electrical products, hardware tools, small toys, gifts and artworks, holiday travel crafts, stationery, and skin care products. , communications, packaging, medical equipment manufacturing industries, etc. If you are interested, Eva Package Eva Box and other bags are on sale, you can contact us.
