Easily-molded polypropylene foaming bead and preparation method thereof
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A technology of foaming beads and molding, which is applied in the field of polypropylene foaming beads, can solve the problems of high steam pressure of EPP beads and hinder the mutual fusion of foamed particles, so as to achieve good fusion and save energy consumption , The effect of less inorganic barrier
Inactive Publication Date: 2017-02-08
WUXI HI TEC ENVIRONMENTAL MATERIAL CO LTD
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[0004] The technical problem to be solved by the present invention is to overcome that when the existing EPP beads are molded, a certain amount of dispersant will still adhere to the surface of the foamed beads after being washed in a water tank, which hinders the interaction of the foamed particles during the steam molding process. Sintering leads to higher steam pressure of EPP bead molding, and at the same time, it can greatly improve the surface defects of products, and provide a production method of expanded polypropylene beads that is easy to mold.
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Embodiment 1
[0019] An easily moldable polypropylene foam bead comprising the following components:
[0020] Dispersant, the dispersant particle size is the kaolin of hydrated aluminosilicate of 20 μm, consumption is 3kg;
[0034] Aqueous dispersion medium deionized water 1000kg;
[0035] Physical blowing agent CO 2 .
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Abstract
The invention discloses a preparation method of an easily-molded polypropylene foaming bead. The easily-molded polypropylene foaming bead comprises a dispersant which is inorganic matter particles with the particle size of 0.01-60 [mu]m, a polypropylene polymer which is a propylene and copolymerization monomer copolymer with the propylene mol fraction being not lower than 60%, an aqueous disperse medium, and a physical foaming agent. The preferable dispersant is hydrated aluminosilicate kaolin with the particle size of 0.1-15 [mu]m, and 0.01-5 parts by weight of the hydrated aluminosilicate kaolin are added to every 100 parts by weight of the disperse medium . The dispersant has good suspension performance in water, and can be easily removed from the surface of foaming particles in the cleaning process after foaming completion, inorganic matter barrier on the surface of the foaming particles in the molding process is less, and the foaming particles can be well molten under a low steam pressure, so the energy consumed in the molding of the foaming bead is saved.
Description
technical field [0001] The invention relates to a polypropylene foamed bead, in particular to a polypropylene foamed bead which is easy to be molded and a preparation method thereof. Background technique [0002] Polypropylene foam material has excellent mechanical properties and is easy to recycle and reuse. It is gradually replacing polystyrene foam material and is more and more widely used. Polypropylene expanded beads (EPP) not only have a high expansion ratio, but also can be molded into products with complex shapes and high dimensional accuracy, which greatly expands the application fields of foam materials. EPP parts are used in packaging and automobile manufacturing Industry and other fields are increasingly used. [0003] At present, the industry adopts the batch reactor foaming method to produce polypropylene foam beads, and then sinters the EPP beads into various products by steam molding. Production of foamed beads: Polypropylene resin particles, aqueous disper...
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