Low-odor low-TVOC polypropylene composite material and preparation method thereof

Abstract

The invention provides a low-odor low-TVOC polypropylene composite material and a preparation method thereof. The low-odor low-TVOC polypropylene composite material is characterized by comprising thefollowing raw materials in parts by weight: 30-99% of polypropylene, 0-30% of an elastomer; 0-40% of mineral powder; 0.5%-10% of an odor adsorbent; 0.5 to 4% of other auxiliary agents; wherein the odor adsorbent is prepared from the following raw materials in parts by weight: 10 to 75% of ethylene-monoolefine copolymer; 10-40% of a microporous substance; 10-40% of a porous substance; 1-5% of a metal oxide; 1-4% of a metallic soap; 1-4% of a bicarbonate; 5-20% of a liquid filler; 0.2 to 1.0% of an antioxidant; and 0.2 to 1.0% of a lubricant. The low-odor low-TVOC polypropylene composite material disclosed by the invention has relatively low odor and TVOC value.

Description

technical field [0001] The invention relates to the technical field of polymer modification, in particular to a low-odor and low-TVOC polypropylene composite material and a preparation method thereof. Background technique [0002] With the increasingly stringent environmental protection regulations, the automotive industry has become an inevitable development trend for the emission of materials such as odor and TVOC. Major automobile manufacturers and material manufacturers have invested a lot of manpower and material resources in research, and have achieved good results. A large number of patents and documents have been published. The main methods to reduce odor and TVOC include: using adsorbents, adding antibacterial agents, adding covering agents, using desorbents, baking, etc. Such as patent CN108329578A uses porous calcium phosphate powder as adsorbent, CN109096598A uses diatomite and its derivatives as adsorbent, CN109651711A uses magnesium silicate as adsorbent; Sod...

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Problems solved by technology

Such as patent CN108329578A uses porous calcium phosphate powder as adsorbent, CN109096598A uses diatomite and its derivatives as adsorbent, CN109651711A uses magnesium silicate as adsorbent; Sodium polyacrylate adsorbs alcohol aqueous solution as a desorbent, etc.; although these methods can achieve good results, they also show many defects in the actual production process. The main reason is that many types of small particles are produced during the processing of polypropylene. Molecular substances, including aldehydes, ketones, acids, esters, benzenes, alkanes, alkenes, amines, sulfur, etc., all of these substances will produce odor, and the threshold for odor generation is very small, so remove these substances Targeted measures need to be studied separately, a single measure cannot remove all odor substances, resulting in poor odor stability of the produced materials during the production process

Taking the adsorption of porous substances as an example, porous substances can only adsorb substances with a molecular diameter smaller than the pore diameter. Due to the large difference in volume of small molecules that produce odors, there is selectivity in the adsorption of porous substances to small molecules that produce odors, and porous substances During the transportation and storage process before use, the odorous substances in the air have been adsorbed, resulting in the inability of the porous substances to discharge the previously adsorbed gaseous substances in the processing process of just a few tens of seconds after being added to the extruder, and thus cannot or cannot be mass-produced. Adsorbs small molecular substances that produce odor in polypropylene, so it cannot achieve a stable adsorption effect, and sometimes even has no effect at all

Similarly, antibacterial agents can only remove odors produced by bacterial decomposition; odor desorbents, usually water, low-molecular alcohols or low-molecular ketones, have poor compatibility with polypropylene and organic matter. For low-molecular alkanes or The desorption effect of olefins (including TVOC) is relatively poor; while baking has no effect on odor substances with large molecular weight and high boiling point

[0003] Due to the complexity of odor sources, the effect of a single targeted odor removal method is limited, so it is necessary to develop a new odor removal method with a wide range of targets

In addition, since the plastic processing process only takes a few tens of seconds, how to ensure the stability of the material's odor is also a difficult point

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