Polyethylene resin foaming particles and preparation method thereof, and polyethylene resin foaming molding body
A polyethylene-based resin and expanded particle technology, which is applied in the field of polyethylene-based resin foamed moldings, can solve the problems of difficult to obtain moldings with good appearance, narrow heating temperature range, low expansion ratio, etc., and achieve excellent in-mold Effects of formability, wide molding processing conditions, and low bulk density
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[0059]
[0060] As a method of manufacturing the polyethylene-type resin particle in this invention, the following manufacturing process (it is also called a "granulation process") is mentioned, for example. First, a polyethylene-based resin and, if necessary, additives such as a hydrophilic compound, a foaming nucleating agent, and the like are blended by a mixing method such as a dry blending method, a masterbatch method, or the like. Next, the resulting mixture is melt-kneaded using an extruder, kneader, Banbury mixer, etc., extruded, and chopped using a cutter, granulator, etc., into cylindrical, oval, or spherical shapes. Polyethylene-based resin particles having desired shapes such as cubes and cuboids. Alternatively, the blend may be cut into pellets and cooled immediately after extruding the above-mentioned blend into water directly from a die.
[0061] Without limitation, in one embodiment of the invention a method using an extruder such as a twin screw extruder. Sp...
Embodiment 1-2
[0122] [Preparation of polyethylene-based resin particles]
[0123] Using MI=2g / 10min, melting point 123°C, density 0.926g / cm3 A linear low density polyethylene containing 8.2% by weight of 4-methyl-1-pentene as a comonomer was used as the base resin. Take 100 parts by weight of the base resin, add 0.25 parts by weight of the hydrophilic compound glycerin, and 0.05 parts by weight of the foaming nucleating agent talc, and dry mix them. Then put the mixture obtained by dry mixing into a twin-screw extruder, melt and knead at a resin temperature of about 280°C, and extrude it into a linear shape through a circular die installed at the front end of the extruder. After water cooling, use a cutting machine Cut to obtain polyethylene-based resin particles. The average particle weight of the polyethylene-based resin particles was 1.8 mg.
[0124] [Preparation of polyethylene-based resin primary foam particles]
[0125] In a capacity of 0.3m 3 In the pressure-resistant autoclave o...
Embodiment 3-4
[0135] By controlling the cutting machine, change the average grain weight of polyethylene-based resin particles, and change the internal pressure and vapor pressure of two-stage foaming and three-stage foaming, and prepare polyethylene-based resin particles in the same manner as in Example 1-2. and polyethylene-based resin expanded particles to obtain a polyethylene-based resin expanded molded body. Table 1 shows the evaluation results of polyethylene resin expanded particles and polyethylene resin expanded molded articles.
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