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By Admin

Dec 24 24

How to avoid discoloration caused by heat, oxygen and light aging during the production process of PVC Profiles?

During the production process of PVC Profiles, heat, oxygen and light aging are the main causes of discoloration. In order to effectively avoid these problems, it is necessary to start from multiple aspects, including optimizing formula design, improving production processes, strengthening quality control and adopting advanced protection technologies.

PVC resin is the main component of PVC profiles, and its quality directly affects the performance of the product. Selecting PVC resin with excellent thermal stability and light stability is the basis for avoiding heat, oxygen and light aging discoloration.

Attention should be paid to the molecular weight distribution and branched structure of the resin, which will affect its thermal stability and processing performance.

Adding high-efficiency stabilizers

Stabilizers are the key to preventing heat, oxygen and light aging of PVC profiles. According to the specific application scenario and processing conditions, it is crucial to choose the appropriate type and amount of stabilizer.

Heat stabilizers such as calcium zinc stabilizers, organic tin stabilizers, etc. can effectively prevent thermal degradation of PVC during processing and use.

Antioxidants can inhibit the free radical reaction of PVC molecular chains in the presence of oxygen, thereby delaying the oxidative aging process.

Light stabilizers such as UV absorbers and hindered amine light stabilizers can absorb or reflect UV rays, reducing their destructive effects on PVC molecules.

Reasonable use of whitening agents and anti-light aging agents

Whitening agents can improve the whiteness and glossiness of PVC profiles, but excessive use may cause uneven color or yellowing. Therefore, the amount of whitening agent should be reasonably controlled according to actual conditions.

Anti-light aging agents can further enhance the light stability of PVC profiles, but attention should also be paid to the selection of dosage and type.

Accurately control processing temperature

Processing temperature is an important factor affecting the thermal stability of PVC profiles. Excessive temperature will accelerate the thermal degradation and oxidation reaction of PVC molecules, leading to discoloration.

Therefore, the processing temperature should be accurately controlled during the production process to avoid long-term exposure to high temperature. At the same time, the appropriate processing temperature range should be adjusted according to the characteristics of different formulas and raw materials.

Optimize extrusion and injection molding processes

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Extrusion and injection molding are the main processes for the production of PVC profiles. During the extrusion process, the material should be uniformly plasticized and extruded in the screw to avoid local overheating or excessive shear stress causing discoloration.

During the injection molding process, parameters such as mold temperature and injection pressure should be set reasonably to ensure the dimensional stability and surface quality of the product.

Strengthen production environment management

Factors such as oxygen, humidity and light in the production environment may affect the discoloration of PVC profiles. Therefore, environmental management should be strengthened during the production process, such as keeping the production workshop dry and ventilated, avoiding direct sunlight, etc.

Raw material quality control

The quality of raw materials directly affects the performance and stability of PVC profiles. Therefore, when purchasing raw materials, suppliers with good reputation and reliable quality should be selected, and strict quality inspections should be carried out on the raw materials.

Production process monitoring

During the production process, key processes and parameters should be monitored and recorded in real time, such as extrusion temperature, injection pressure, mold temperature, etc. Once an abnormality is found, measures should be taken immediately to adjust and deal with it.

Finished product quality inspection

Strict quality inspection of the produced PVC profiles, including appearance inspection, dimensional measurement, performance testing, etc. Ensure that the products meet relevant standards and customer requirements.

Fourth, use advanced protection technology

Surface coating technology

Coating a layer of coating with excellent weather resistance and anti-aging properties on the surface of PVC profiles can effectively improve its light stability and service life. Commonly used coating materials include polyurethane, acrylic, etc.

Blending modification technology

The performance and stability of PVC profiles can be improved by blending and modifying with other polymer materials. For example, blending with polyolefins, polyesters, etc. can improve its heat resistance and anti-aging properties.

Nanocomposite technology

Nanocomposite materials can be formed by adding nanoparticles to the PVC matrix. This material has excellent mechanical properties and thermal stability, and can effectively prevent the heat, oxygen, and light aging and discoloration of PVC profiles.

To avoid the discoloration problem of PVC Profiles caused by heat, oxygen, and light aging during the production process, it is necessary to start from multiple aspects such as formula design, production process, quality control, and protection technology. By comprehensively applying these measures, the stability and service life of PVC profiles can be effectively improved to meet the actual needs of customers.