A kind of PVC pellet composition with low volatile precipitation and its preparation method and application

Abstract

The invention provides a low-volatile-separation PVC (Polyvinyl Chloride) particle composition and a preparation method and an application thereof. Based on every 100 parts by weight of PVC, the composition comprises the following components in parts by weight: 46-60 parts of dioctyl terephthalate serving as a PVC100 plasticizing agent, 3-5 parts of a thermal stabilizer, 2-4 parts of a gelatinizing aid, 10-30 parts of powder nitrile rubber, 0.4-1.0 part of an external lubricant and 0.4-1.0 part of an internal lubricant. The preparation method comprises the following steps of: weighing component raw materials according to a formula; mixing at a high speed to 125 DEG C; performing cold mixing at a low speed to a temperature below 40 DEG C; extruding with a single screw; pelletizing; and cooling and packaging with a fan. The low-volatile-separation PVC particle composition is suitable for manufacturing an automobile sealing strip which requires low volatile separation of a plasticizing agent.

Description

technical field [0001] The invention relates to a PVC pellet composition, especially a PVC pellet composition with low volatile precipitation; it also relates to its preparation method and specific application; it belongs to the technical field of polymer compound compositions. Background technique [0002] PVC is the English abbreviation of polyvinyl chloride. PVC is cheap and widely used. It is one of the plastic products with the largest output in the world. [0003] Ordinary soft PVC modified materials, in the high temperature environment, the ordinary plasticizer in PVC will slowly volatilize and precipitate on the surface of the product. In this way, on the one hand, due to the precipitation of the plasticizer, the surface of the product will be polluted; on the other hand, due to the loss of the plasticizer, the PVC product will gradually harden and its elasticity will decrease, which will affect the performance of its finished product. [0004] PVC modified material...

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Problems solved by technology

In this way, on the one hand, the surface of the product will be polluted due to the precipitation of the plasticizer; on the other hand, due to the loss of the plasticizer, the PVC product will gradually harden and the elasticity will decrease, which will affect the performance of its finished product.

[0004] PVC modified material is the main raw material for manufacturing automobile sealing strips. Some automobile OEMs require that the plasticizer precipitation of soft PVC elastic materials be controlled in a very low range. Usually, the American ASMTD1203-A standard is adopted, and the standard is tested according to its specified The method requires PVC modified materials to have thermal volatilization loss of plasticizer ≤ 2.5% within the specified time of simulating high temperature environment. At present, domestic ordinary PVC modified materials in the market are far from meeting this requirement, and their high temperature volatilization loss is generally 5-7% %

Although some imported PVC modified materials can meet the requirements of the American ASMTD1203-A standard, the use of imported PVC modified materials will lose competitiveness due to the long procurement cycle and high product prices.

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