Environment-friendly, low-smoke and lead-free PVC electrical tube and preparation method thereof

Abstract

The invention discloses an environment-friendly, low-smoke and lead-free PVC electrical tube and a preparation method thereof. The electrical tube comprises the following components in mass part: 100 parts of PVC resin, 20-25 parts of calcium carbonate, 3.0-5.0 parts of organic composite heat stabilizer, 8-12 parts of impact-resistant agent, 2-3 parts of hydrotalcite, 5-8 parts of reinforcing agent, 2-4 parts of halogen-free anti-smoke flame retardant, 1-2 parts of internal and external lubricants, and 0.7-1.3 parts of TiO2. According to a formula ratio, the calcium carbonate is added firstly to be mixed at a high speed, and water in the calcium carbonate is removed. After that, the PVC resin is added to be mixed at a high speed for 2-3 min, and then other components are added to be thermally mixed and kneaded at a high speed for 10-15 mins. In this way, the temperature of an obtained product is up to 120-130 DEG C. Later, the product is cooled with the provision of cooling water at a stirring speed of 10-15 r / min to be discharged at 40-50 DEG C. Finally, the product is reheated to be plasticized, extruded and molded at 150-220 DEG C. The electrical tube is good in rigidness, anti-bending performance, heat resistance, aging resistance and insulativity, low in manufacturing cost and simple in machining process.

Description

technical field [0001] The invention relates to the field of polyvinyl chloride electrical pipe materials, in particular to an environment-friendly low-smoke lead-free polyvinyl chloride electrical pipe and a preparation method thereof. Background technique [0002] Polyvinyl chloride (PVC) is one of the five general-purpose resins (PE, PVC, PP, PS, ABS) in the world. However, the structure of PVC is unstable, and it is easy to degrade during processing and molding. When the processing temperature reaches 90°C, a slight thermal decomposition reaction occurs; when the temperature reaches 120°C, an obvious thermal decomposition reaction occurs, making the color of PVC gradually deepen. Therefore, heat stabilizers must be used to prevent thermal decomposition of PVC during processing. [0003] Commonly used heat stabilizers mainly include lead salts, metal soaps, organotins, rare earths, and calcium-zinc stabilizers. With the further enhancement of people's awareness of envir...

AI Technical Summary

Problems solved by technology

If this type of flame retardant is used alone, the flame retardant effect is not ideal, and the addition amount is large, which not only increases the cost of the product but also affects the bending properties of the material

[0005] Moreover, the current production of PVC electrical pipes uses a large amount of lead salt stabilizers, which not only may cause great harm to the producers during the production process but also cause heavy metal deposition to the surrounding environment, including water, soil and air, thus affecting the quality of life in this environment. Immeasurable health hazards to humans and animals

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