Preparation method of expanded polyolefin beads, expanded polyolefin sheet and application thereof

Abstract

The invention relates to the technical field of environmentally friendly new materials, and specifically discloses a preparation method of foamed polyolefin beads, including the following steps: adding polyolefin resin and additives to a high-speed mixer, stirring and mixing evenly, and passing through a screw extruder , to obtain uniformly mixed polyolefin resin particles; using supercritical CO 2 As a foaming agent, add polyolefin resin particles into the foaming tank, add water and dispersant at the same time, and then heat and pressurize the reactor to obtain primary foamed polyolefin beads; inject primary foamed polyolefin beads into the carrier Pressurize the tank, and pass compressed air into the tank, and after the pressure loading is completed, inject the primary expanded polyolefin beads into the foaming machine to obtain the expanded polyolefin beads. The invention also discloses the foamed polyolefin plate and its application. The foamed polyolefin beads and foamed polyolefin boards prepared by the preparation method of the present invention have excellent shock absorption and sound insulation properties, and are widely used in thermal insulation and sound insulation systems of building floors.

Description

technical field [0001] The invention relates to the technical field of environmentally friendly new materials, in particular to a preparation method of foamed polyolefin beads, a foamed polyolefin plate and applications thereof. Background technique [0002] Polyolefin foam material has excellent properties such as low density, good shock absorption, excellent heat insulation, good sound insulation effect, non-toxic, and excellent physical and chemical stability. At present, polyolefin foaming materials are widely used in auto parts, packaging, home furnishing and other fields, and the application of polyolefin foaming materials is gradually opening up in other application fields. [0003] In recent years, in construction and other fields, as people have higher and higher requirements for the comfort and safety of life, a variety of floor slabs are used for shock absorption and sound insulation, room energy saving and heat preservation, and at the same time have flame retard...

AI Technical Summary

Problems solved by technology

Among them, EPS material can effectively improve the thermal insulation performance of commercial buildings, but EPS has the following disadvantages: 1. Hydrochlorofluorocarbon compounds or butane will be used in the foaming process, and the product is difficult to degrade and easy to form "white pollution", which is harmful to the environment. 2. The sound insulation performance and flame retardancy of this material are poor; 3. The toughness of the EPS formed sheet is poor, and its impact resistance and repeated impact compression will cause a large permanent deformation; As far as polyethylene products are concerned, the production and construction of the products are complicated, the construction is difficult, and the requirements for construction personnel are high. At the same time, its flame retardancy is also poor.

[0006] The expanded particles prepared by the above-mentioned technical scheme obtains the primary expanded particles after extrusion and foaming, and then performs secondary foaming. The cycle of its production is longer, and the final expanded particle density is higher (can only reach 50g / L), and it is not easy to achieve stable control; at the same time, due to the heavy density of the primary foamed particles obtained by using this production process technology, if the secondary foaming obtains low-density foamed particles, it needs to be realized at a higher temperature. , which determines that the closed cell rate of this kind of secondary foamed particles will be greatly reduced, so that the sound insulation performance and thermal insulation performance of the product will be greatly affected

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