A kind of polyvinyl chloride flame retardant board and its production process

Abstract

The invention relates to a polyvinyl chloride flame-retardant plate and a production process thereof. The polyvinyl chloride flame-retardant plate is prepared from the raw materials, including 45 to 55 parts of polyvinyl chloride resin, 10 to 20 parts of polyethylene resin, 0.1 to 3 parts of a glutinous rice glue powder, 5 to 15 parts of a plasticizer, 0.1 to 2 parts of a bubble nucleating agent, 5 to 15 parts of liquid chlorine, 2 to 4 parts of a foaming promoter, 0.01 to 0.1 part of an initiator, 0.5 to 1.5 parts of a heat stabilizer, 0 to 1 part of an anti-ageing agent, 0.3 to 0.8 part of a lubricating agent, 2 to 4 parts of a flame retardant, 0 to 3 parts of pigment and 0 to 0.5 part of a compatilizer, by the steps of completing mixing and chlorination reaction by using a foaming extruder, performing extrusion molding by a second extruder, and performing calendaring, cooling molding, traction and cutting to prepare the finished product. The production process provided by the invention is simple in equipment, convenient to operate and low in processing temperature; the polyvinyl chloride flame-retardant plate prepared by the process is excellent in ageing resistance, flame retardance, tensile resistance and impact resistance.

Description

technical field [0001] The invention belongs to the field of flame-retardant board preparation, and in particular relates to a production process of a polyvinyl chloride flame-retardant board. Background technique [0002] Polyvinyl chloride is a general-purpose plastic with excellent comprehensive performance, low price and wide source of raw materials. Its output is second only to polyethylene and ranks second in the world's resin output. Its application in various fields of life will also become more and more extensive. The processing and production of PVC flame retardant boards is usually made by adding flame retardants, lubricants and other functional additives to polyvinyl chloride resin and extruding them through an extruder. However, in order to ensure the hardness (tensile resistance) of the PVC flame-retardant board, it is often not possible to add plasticizers that affect the hardness and softening temperature of the PVC flame-retardant board, and not adding plast...

AI Technical Summary

Problems solved by technology

Its application in various fields of life will also become more and more extensive. The processing and production of PVC flame retardant boards is usually made by adding flame retardants, lubricants and other functional additives to polyvinyl chloride resin and extruding them through an extruder. However, in order to ensure the hardness (tensile resistance) of the PVC flame-retardant board, it is often not possible to add plasticizers that affect the hardness and softening temperature of the PVC flame-retardant board, and not adding plasticizers often leads to polyvinyl chloride The uneven mixing between PVC and other additives (such as flame retardants, lubricants) during the processing of vinyl chloride flame retardant boards will affect the mechanical strength and performance of the finished product. To solve this problem, it usually needs to be heated to a high temperature. High temperature (often exceeding 170°C) can make PVC in a viscous flow state to meet the requirements of uniform mixing with tougheners, flame retardants and other additives. However, when PVC resin reaches 170°C, it is easy to decompose and release chlorine gas , so that the practice of raising the temperature is unfeasible; therefore, how to complete the mixing of polyvinyl chloride resin and various additives at a lower temperature, and extrude it into a polyvinyl chloride flame-retardant board processing is the most important important issues;

[0003] In addition, polyvinyl chloride products are used as structural materials, and strength and toughness are two important mechanical properties. However, polyvinyl chloride has a high glass transition temperature, is usually brittle, and has disadvantages such as low impact strength and poor processability. It is necessary to add a toughening agent to the PVC flame-retardant board during the production process to enhance the impact resistance of the PVC flame-retardant board. However, due to the limitation of the processing temperature, it can be used for the toughening of the production of the hardness PVC flame-retardant board. The types of additives are limited and the effect is not good. Therefore, how to improve the impact resistance of PVC flame-retardant panels is also an important issue in the production and processing of PVC flame-retardant panels.

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