Low-diffusion polypropylene composition and preparation method thereof

Abstract

The invention relates to a low-diffusion polypropylene composition which comprises the following components in percentage by weight: 55-99.8 percent of polypropylene composite material and 0.2-5 percent of organopolysiloxane silicone oil, wherein the organopolysiloxane silicone oil comprises one or a plurality of hydrogen-type polysiloxane, hydroxyl polysiloxane, methyl polysiloxane, ethenyl polysiloxane, amino polysiloxane, epoxy polysiloxane and methoxyl polysiloxane silicone oil. A preparation method of the low-diffusion polypropylene composition comprises the following steps of: weighing the components of polypropylene, talcum powder, a toughening agent, an antioxidant, a light stabilizer and the organopolysiloxane silicone oil in percentage by weight; mixing the polypropylene, the toughening agent, the antioxidant, the light stabilizer and the organopolysiloxane silicone oil for 1-2 minutes in a high speed mixer firstly and then adding the talcum powder and mixing for 3-5 minutes; and extruding and pelletizing the mixed materials by using a double screw extruder, wherein the process conditions are that: the temperature of a first area is 200-210 DEG C, the temperature of a second area is 210-220 DEG C, the temperature of a third area is 210-220 DEG C and the temperature of a fourth area is 200-215 DEG C, the retention time is 1-2 minutes, and the pressure is 10-20MPa. Thelow-diffusion polypropylene composition has the advantages that: the organopolysiloxane silicone oil forms a layer of even film on the surface of the talcum powder, which can block up a TVOC (Total Volatile Organic Compound) of the polypropylene material so as to reduce the pollution.

Description

technical field [0001] The present invention relates to a polypropylene composition, especially a low emission polypropylene composition. The invention also provides a preparation method of the low emission polypropylene composition. Background technique [0002] Because the car compartment is often in a closed state, the internal air quality is often affected by free formaldehyde, alkanes, benzene, toluene and other organic compounds (TVOC) produced by interior products such as leather seat covers or cloth seat covers, which have adverse effects on the human body . In order to reduce the TVOC content in the material, it is necessary to control the source of raw materials, processing technology, additives, etc., or add substances that can react with these small molecule volatile substances to form a larger molecular weight, which is less volatile and can be stably stored in the material. Compounds that are not easily volatile, so as to achieve the purpose of reducing TVOC....

AI Technical Summary

Problems solved by technology

[0003] However, the method of reducing TVOC through chemical reaction is often only aimed at one factor that produces TVOC, and cannot solve the TVOC problem produced by various factors at the same time; physical adsorption does not have specific selectivity, and can adsorb all small molecules produced, but Adding molecular sieves to prepare low TVOC polypropylene materials has a disadvantage: no oily substances can be added to the system