Preparation method of low-VOC glass fiber reinforced polypropylene halogen-free flame-retardant composite material

Abstract

The invention discloses a method for preparing a low-VOC glass fiber reinforced polypropylene halogen-free flame-retardant composite material, which comprises the following steps: firstly drying the raw materials; secondly using a twin-screw extruder to melt and blend to prepare glass fiber reinforced polypropylene respectively Masterbatch and hollow glass microbead masterbatch; then the two are mixed and injected through a single-screw injection molding machine to obtain a low-VOC and low-density glass fiber reinforced polypropylene composite material. The composite material obtained by the preparation method of the present invention can catalyze and degrade the VOC in the car efficiently, energy-savingly and environmentally friendly without external ultraviolet light source or equipment; at the same time, hollow glass microspheres coated with a compatibilizer are added, without reducing the strength of the composite material Under the premise, it has good compatibility with glass fiber reinforced PP and can effectively reduce the density. The preparation method provided by the invention is simple and reliable.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a method for preparing a low-VOC glass fiber reinforced polypropylene halogen-free flame-retardant composite material. Background technique [0002] With the rapid development of social economy, cars have become indispensable in people's lives. Since modern people stay in the car for a long time every day, the air quality inside the car is closely related to human health. There are two main factors that affect the air quality in the car: one is the release of harmful gases from the interior of the car itself; the other is the release of harmful gases from the car decorations selected by the car owner. In the final analysis, these two aspects are the volatilization of harmful gases in automobile interior decoration parts. The harmful gases are mainly volatile organic compounds (volatile organic compounds), that is, VOC. WHO defines VOC as volatile compounds with a boi...

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Problems solved by technology

However, reducing VOC by controlling the source of raw materials only solves one factor of VOC generation, and cannot solve the newly generated VOC substances in the process

The adsorption method, whether it is physical adsorption or chemical adsorption, has the problem of selectivity and balance of adsorption.

Chinese patent CN105001525A by adding at least one of activated carbon, molecular sieve, zeolite powder and nano inorganic powder (TiO 2 or ZnO) to reduce odor and VOC, the former is mainly used for adsorption, and the latter is mainly used for adsorption and degradation of VOC, but the 20-80nm nano-inorganic powder is easy to agglomerate, and its ability to absorb and degrade is greatly reduced. And without modification, it needs to be excited by ultraviolet light to play a role, so the effect is very limited

However, the low-molecular organic repellant used in this method has compatibility problems with the polypropylene resin and the carbonates and their decomposition products, and water and fatty alcohols with a boiling point lower than 200°C, due to their low boiling point and And the premix is ​​added to the extruder in the main feed, then there are problems with the durability and uniformity of the melt of the modified polypropylene material

The above invention only improves a certain factor that generates VOC, and cannot solve the problem of VOC generated in both raw materials and production processes at the same time

[0005] On the other hand, polypropylene PP is very easy to burn, has a large calorific value and is prone to produce a large number of molten droplets, which is very easy to spread flames, so flame retardant modification is required

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