Injection molding problem: plastic fades easily
author: Universe plastic
2024-03-29
Plastic products produced by injection molding are subject to various factors during the injection molding process, causing them to fade easily. It is mainly related to the light resistance, oxygen resistance, heat resistance, acid and alkali resistance of coloring pigments and dye additives during injection molding, as well as the characteristics of the injection molding materials used.
The easy fading of injection molded plastics will affect the appearance quality and market acceptance of the product. The following Universe Plastics engineers analyzed several reasons and solutions for the easy fading of injection molded plastics:
Reasons why injection molded plastics fade easily
1. Lightfastness grade of colorants
The light resistance of the colorant will directly affect the fading effect of the product. If you are manufacturing outdoor plastic products that are exposed to strong light, it is very important to choose the light fastness level of the colorant. Plastic products with a low light fastness level will fade quickly during use.
2. Light resistance of plastic materials
The light resistance of plastic product materials has a great influence on fading changes. After ultraviolet irradiation, the structure of plastic materials changes, leading to fading.
3. Temperature parameters during injection molding
When setting the temperature parameters of the injection molding machine, the thermal stability of the plastic pigment needs to be considered. Plastic pigments at high temperatures can easily cause oxidative discoloration, weight loss discoloration, fading and other problems.
4. Chemical resistance of colorants
Acid and alkali resistant plastic products are prone to fading, which is related to the chemical 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 pigments and phenolic resin have a strong reducing effect on certain colorants, resulting in poor heat resistance.
Prevent injection molded plastic from fading
1. When making outdoor plastic products by injection molding, it is recommended that the light resistance level of the colorant should be no less than level six, and it is best to use level seven or eight. For indoor plastic products, level four or five can be selected.
2. Adding UV absorbers to injection molding materials can improve the UV resistance of the product.
3. When selecting colorants, pay attention to the heat resistance of the pigment, such as whether the heat resistance time and heat resistance temperature match the injection molding temperature to meet the requirements of injection molding production.
Summarize
The factors that lead to the fading of injection molded plastics are complex, among which plastic colorants, plastic light resistance, plastic oxidation resistance, etc. are all related to a certain extent. Pigments, colorants, additives, plastic materials, etc. should be used after comprehensive evaluation based on the processing environment and usage scenarios of plastic products.
Dongguan Universe Plastic Factory has more than 15 years of injection molding production experience, a professional team and material supply channels, and can provide injection molding services with high-quality color molding and long-term colorfastness.
If you are looking for a high-quality injection molding factory, please contact us to get the latest service prices.
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