Dyed foaming particle and preparation method and application thereof

Abstract

The invention belongs to the field of chemical foaming high polymer materials, and particularly relates to a dyeing foaming particle and a preparation method and application thereof. The dyeing foaming particle is characterized in that a polymer dyeing layer is adhered to the surface of the foaming particle, and the thickness of the polymer dyeing layer is 0.1 [mu]m to 2 mm. According to the invention, a layer of a coloring adhesive is uniformly cured on the surface of the foaming particle; and the coloring adhesive has the characteristics of uniform dyeing, high color fastness, good performance, simple operation, wide applicability and the like.

Description

technical field [0001] The invention belongs to the field of chemical foaming polymer materials, and in particular relates to a dyed foaming particle and a preparation method and application thereof. Background technique [0002] Using plastic resin particles as the matrix, a large number of air bubbles are filled inside the plastic particles by extrusion foaming granulation or autoclave foaming to obtain polymer foamed particles. The foam material has a series of advantages such as low density, heat insulation, high specific strength, high elasticity, cushioning, etc., so it is widely used in the fields of packaging, industry, agriculture, transportation, military industry, aerospace industry, and daily necessities. application. Commonly used foamed plastic particles are thermoplastic polyurethane foamed particles (ETPU), thermoplastic polyester foamed particles (ETPEE), polyamide elastomer foamed particles (ETPAE), polypropylene foamed particles (EPP), polyethylene foamed...

AI Technical Summary

Problems solved by technology

Due to the shortcomings of white foamed particles such as single color, easy to change color, easy to pollute and difficult to clean, people's demand for colored plastic foamed particles is increasing day by day

[0004] The traditional method of preparing colored foamed particles is to use colored plastic matrix particles for foaming, but it has major disadvantages: First, due to volume expansion after foaming, it is necessary to add a large amount of pigments to the plastic base material to ensure the amount of color, The addition of excessive pigments will reduce the performance of the plastic; second, for the autoclave foaming method, the colored plastic matrix particles need to stay at high temperature for a long time, which will cause the interface migration of the color of the colored plastic matrix particles

Patent document ZL201410196699.3 discloses the method of using colored TPU resin as raw material, supercritical CO2 as foaming agent, adopting autoclave foaming method, and adopting high-pressure fluid low-temperature impregnation method to solve the problem of color migration, but in TPU resin During the foaming and expansion process, the toner will not become larger with the same level, because the mixing of toner and TPU cannot reach the molecular level, thus affecting the color uniformity of the colored foamed particles

Patent document CN107501592A discloses a preparation method of colored TPU foam beads, which is to add the pigment into the heating medium water through the method of autoclave foaming, and bring the pigment into the TPU under the entrainment of high-pressure and high-temperature fluid, so that Realize the dispersion at the molecular level, but this molecular level dispersion means that the pigment molecules enter the interior of the TPU molecular chain, which will inevitably cause the distance between the TPU molecular chains to expand and the force between the molecular chains to decrease, thereby affecting the physical properties of the foamed particles and products.

Patent document WO2007 / 082838 discloses a hybrid material of foamed thermoplastic polyurethane elastomer and polyurethane, which discloses that pigments are added to the hybrid system when the product is molded. Due to the high viscosity and poor dispersibility of the toner pigment, this method It is not easy to dye evenly. In addition, the method prepared by this method is a one-piece molded product, which cannot be processed by secondary molding.

Patent document CN106283750A discloses a dyed ETPU and its dyeing process, which uses an organic solvent to dilute the colorant. First, the addition of an organic solvent will corrode the foamed particles of the polymer, destroy the cell structure of the foamed particles, and affect the performance. Solvents can cause environmental pollution

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