Low-odor low-VOC (volatile organic compound)-content styrene polymer composition and preparation method thereof

Abstract

The invention discloses a low-odor low-VOC (volatile organic compound)-content styrene polymer composition and a preparation method thereof. The composition is prepared from the following components in percentage by weight: 70-99% of styrene polymer, 0.5-29% of strippant master batch and 0.01-1% of antioxidant. The preparation method comprises the following steps: preparing a strippant master batch, mixing the components in a high-speed mixer, adding the mixture into a screw extruder, carrying out melt extrusion, and granulating. The invention has the advantages of simple production technique and lower production cost, and effectively lowers the order and VOC content of the styrene polymer; and the prepared styrene polymer composition can be used in the field of materials with strict environmental requirements in packaging materials, daily necessities, home appliances, OA, toys, sports equipment, shoe materials, cables, instruments and meters, electronic components and equipment, construction materials and automobile materials.

Description

technical field [0001] The invention relates to a styrene polymer composition, in particular to a styrene polymer composition with low odor and low VOC content and a preparation method thereof. Background technique [0002] As the public's awareness of environmental protection and health increases, people put forward higher requirements for indoor odor and air quality. Styrene polymers are widely used as home appliances, OA, packaging materials, daily necessities, toys, sports equipment, shoe materials, cables, instruments and meters, electronic components and equipment, building materials and automotive materials. Household appliances, OA, toys and automotive materials have stricter requirements on odor and VOC. [0003] In the process of synthesis, preparation, modification and molding, styrene-based polymers will contain some volatiles. The sources generally include residual monomers, solvents, additives, and small molecular substances produced by degradation. The above-...

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Problems solved by technology

Chinese patent 98124504.8 discloses a method for removing volatile materials, including discharging the foaming aid with a nozzle device, adding it in the direction opposite to the flow of the composition, and decomposing the composition under pressure that does not generate foaming. Introduce it into a mixing device for mixing, and then use an extrusion device to extrude the mixture into a devolatilization tank, so that the polymer becomes a foamed product at a pressure and temperature with a foaming coefficient B of 1.4 or higher, thereby removing volatile Material, although the above-mentioned method can obtain the low polymer composition of volatile material amount, because when stripping agent is directly added to raw material, a large amount of stripping agent can not be immersed in raw material, adds screw extruder operation difficulty on the one hand, On the other hand, even if it is added to the screw extruder, due to the high temperature of the extruder, the stripping agent is easy to vaporize and overflow at the feeding port, and the effect of air stripping cannot be achieved, so a special adjustable flow rate is required. And the injection nozzle with ejection function, at the same time, it is necessary to add a pressurized mixing zone to improve the distribution of the stripping agent and limit the overflow of the stripping agent steam from the target exhaust section, resulting in high cost and difficult operation of the above methods.