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1. Function of silicone additive in engineering plastics
The role of silicone release agent in engineering plastic injection molded parts mainly includes the following points:
1. * * Improve demolding efficiency * *: Silicone demolding agents can effectively reduce the friction coefficient between plastic parts and molds, improve smoothness, and make it easier for plastic parts to detach from molds, thereby improving production efficiency.
2. * * Improving the surface quality of products * *: The use of silicone release agents can reduce adhesion on the mold surface, resulting in a smoother and more aesthetically pleasing plastic part surface and avoiding surface damage caused by difficult demolding.
3. * * Reduce mold wear * *: silicone additive provides a protective layer to reduce mold wear caused by direct contact and extend the service life of the mold.
4. High temperature resistance: Silicone release agents have excellent heat resistance and are suitable for high-temperature injection molding processes. They will not decompose or burn due to high temperatures.
5. * * Chemical Stability * *: Silicone release agents have good chemical stability, are not easily reacted with plastics, and do not affect the chemical properties and secondary processing performance of plastic parts.
6. * * Environmental Characteristics * *: Silicone release agents usually meet environmental requirements, are non-toxic, have low odor, and are friendly to operators and the environment.
7. Wide applicability: silicone additive are suitable for injection molding release of various engineering plastics, including but not limited to PP, PE, EVA, ABS, PA, PC, etc.
8. * * Durability * *: After coating with silicone release agent, a durable release film can be formed on the surface of the mold, reducing the number of recoating times and improving production efficiency.
9. * * Easy to apply and maintain * *: Silicone release agent is usually provided in the form of spray, solution or lotion, which is easy to apply evenly on the mold surface and easy to maintain.
10. * * Improve product filling capacity and extrusion volume * *: Silicone release agents can improve the fluidity of engineering plastics, thereby enhancing product filling capacity and extrusion volume, and improving production efficiency.
2. Choosing the appropriate silicone additive to meet specific injection molding process requirements requires consideration of the following key factors:
1. Material and performance of molded products: Consider the polarity of the product, melt viscosity, and adhesion to the mold material. Silicone release agents should be compatible with plastic materials and not cause chemical reactions.
2. * * Product molding process conditions * *: including processing temperature, film retention time, and the direction of the product’s detachment from the mold. Silicone release agents should be able to work stably within the temperature range of the injection molding process without affecting the molding accuracy of the product.
3. Technical requirements for molded products: processing batch size, dimensions, workpiece accuracy requirements, surface adhesion and coating requirements, etc. Silicone release agent should provide good release effect without affecting the secondary processing performance of the product.
4. * * Mold conditions * *: Mold material, shape, specifications, dimensions, working surface condition, etc. Silicone release agent should be suitable for the material of the mold and form a uniform isolation film on the surface of the mold.
5. * * Process performance and usage performance of release agent * *: including the use and removal process limitations of release agent, working temperature, processing life, product peeling force requirements, etc. Silicone additive should be easy to apply and remove, and maintain consistent performance during repeated use.
6. Environmental Protection and Safety: Choose non-toxic, low odor, and environmentally friendly silicone additive to ensure the health and safety of operators.
7. Cost effectiveness: Considering the cost-effectiveness of release agents while meeting technical requirements, choose products with high cost-effectiveness.
8. * * Specific application requirements * *: For special applications such as products with high transparency requirements, silicone release agents that do not affect the transparency of the product should be selected.
9. * * Ease of use * *: Select a silicone additive that is easy to operate, such as a spray can, to improve work efficiency.
3. Certificate of silicone additive
1. * * Environmental performance testing * *: mainly examines whether the silicone additive causes environmental pollution during use and production, including but not limited to solvent residue, heavy metal content, and whether it contains harmful substances. Qualitative and quantitative analysis can be performed using instruments such as gas chromatography-mass spectrometry (GC-MS) to ensure that the product meets environmental standards.
2. * * Safety testing * *: Safety testing mainly evaluates the toxicity, irritability, and whether there are substances harmful to the human body of release agents. Its safety can be evaluated through skin irritation testing, eye irritation testing, and inhalation toxicity testing. In addition, its physical and chemical properties such as flash point, freezing point, pH value, etc. should be tested to ensure the safe use of the product.
3. * * Chemical property testing * *: Chemical property testing includes solid content, viscosity, specific gravity, moisture content, etc., which directly affect the application effect and performance of silicone additive.
4. * * Physical property testing * *: Physical property testing mainly evaluates the appearance, color, uniformity, etc. of the release agent, and can be preliminarily judged through visual observation.
5. * * Stability testing * *: Stability testing evaluates the chemical and physical stability of release agents under different environmental conditions, ensuring that the product’s performance does not undergo significant changes during storage and use.
6. Testing for Specific Application Requirements: Depending on the specific application field of silicone additive, specific requirements such as high temperature resistance, acid and alkali resistance may also need to be tested.
7. Compliance with industry standards and regulations: Ensure that silicone release agents meet relevant industry standards and regulatory requirements, such as SAE AMS3091C-1993 (R2000), 21CFR 181.28-2018, etc.
