JPS58145424A - Manufacture of molded product from polypropylene type resin prefoamed particle in mold - Google Patents

Abstract

PURPOSE:To eliminate a necessity to provide a drying equipment separately and make unnecessary an operation of carrying in and out a molded product to and from a drying chamber, by sucking and drying the inside of a mold after molding a foamed molded product. CONSTITUTION:The prefoamed particle 5 of a polypropylene type resin is filled in a mold 1 having a hole 25 through which a heating medium such as a water vapor etc. passes through. Then, after it is heat-foamed by using, for example, the water vapor of 1.0-6.5kg/cm<2>G, it is sucked and dried. The sucking operation in a drying process is preferably performed while the temperature of a molded product is above 100 deg.C. The foamed molded product is taken out from the mold after drying by sucking and it is packed with a heat insulation material while the temperature of the molded product is above 50 deg.C and cooled slowly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing pre-expanded pyrene-based resin particles.

Traditionally, P-foam shoes are made of foamed polystyrene.

Ii pond polyethylene etc. are used, these OIi
For example, beads using the extrusion I# method and pre-expanded particles have been obtained. However, the disadvantages of foamed polystyrene are that it is brittle and has inferior IsI resistance, and that it is inferior to T**Ike polyethylene in terms of mechanical strength and heat resistance. Since polypropylene resin itself has high mechanical strength and heat resistance, and is excellent in chemical resistance, oil resistance, buffering properties, and low temperature properties, it is desired to produce a foamed product OII. Although simple molded products in the form of plates or sheets can be obtained by extrusion, complex shapes can also be obtained.

However, the present applicant has proposed a method for obtaining pre-foamed particles with high p-foaming, and a foamed material with good p-foaming properties was obtained by the bead welding method using pre-expanded particles of c. iru. KoO
That's how you get it! Although the stratified body has excellent physical properties, the drying process after taking out the stratified body from the Ikeiyokai requires complicated work and equipment, and consumes a lot of energy. There is still room for improvement in that point and layered NiL lines occur.

An object of the present invention is to provide a method for manufacturing a poly-10-pyrene resin pre-produced/II-particle crossbody which eliminates the drawbacks of the prior art described above. As a result of intensive research to achieve this goal, 2. After wearing the foamed laminate, the foam was dehydrated by suction without being removed from the shoe. 9. Then, if necessary, the laminate was wrapped in heat insulating material and slowly cooled. It was discovered that the drying process was simplified and a laminate without shrinkage could be obtained, and the inventors succeeded in developing a method for producing the same, thereby completing the present invention.

That is, pre-formed #1 particles of vA#i polypropylene resin are filled into a gold layer for lamination, heated and foamed, and then dried by suction, after which the laminated body is prepared as described above.

Pre-expanded particles of the other pre-expanded polyglobylene resin of the present invention are filled into a molding layer 1, heated and foamed, pulled to a thickness of 9 mm, and dried. 2. A method for producing a polypropylene j1 & resin pre-expanded particle Takiuchi body, which is characterized in that the laminated body is then packaged with a heat insulating material at a temperature of 50° C. or higher and slowly cooled.

The polyglobylene-based 411fir pre-expanded particles used in the present invention can be produced, for example, by the following pre-expanding method. That is, a step of incorporating a volatile foaming agent into the bipolymer particles, a step of dispersing the polymer particles in a dispersion medium in a honeycomb container and heating them to a predetermined temperature fK11J, and a step of releasing one end of the container and dispersing the above-mentioned particles. It can be produced by a preparatory method consisting of a step of simultaneously releasing the dispersion medium into air at a lower pressure than the inside of the container.

Examples of the material for the pre-expanded particles include ethylene-propylene random copolymer, ethylene-10-pyrene block copolymer, and 10-pyrene homopolymer, which may or may not be crosslinked. Fruitless things are beneficial. Among the nine polymers mentioned above, ethylene-g-q-pyrentsundum A polymer is preferred, especially with an ethylene component of 0.5
~1O heavy picture section is preferable.

Volatile blowing agents used in this pre-foaming method include aliphatic hydrocarbons such as propane, butane, beetane, hequinane, hepkune, and the like.

Large-volume aliphatic hydrocarbons such as cyclobutane, cyclopentane, etc. and trichlorofluoromethane.

Dichlorosifluoromethane, dichlorotetrafluoroethane, methyl chlorophyte, ethyl chloride.

/S halogenated hydrogen chloride, etc., exemplified by methylene chloride, etc., are used. The amount of foaming agent added is not limited to tatami mats, but is usually 5 to 40 parts by weight per 100 parts by weight of the polymer particles.
Weight part S can be used directly.

In this method, the polymer particles and the volatile blowing agent are separately dispersed after the volatile blowing agent is incorporated into the polymer particles.
If appropriate, dispersants 9 such as finely divided aluminum oxide and titanium oxide, basic magnesium carbonate, basic zinc sulfate, calcium carbonate, etc. can be used.

O Dispersant OIi Addition amount: Polymer rice grains 100 weight 11
The amount is 0.01 to 10 parts by weight. Any lacquer medium that does not dissolve the nine-dispersed polymer particles will suffice.

Examples include water, ethylene glycol, glycerin, methanol, ethanol, etc., and mixtures of two or more thereof, with preference given to water.

9. In this method, one end of the container is opened and the polymer particles and dispersion medium are released into an atmosphere at a lower pressure than in the simultaneous KIF vessel, but at this time, the pressure inside the container and the volatile blowing agent are eliminated. The atmosphere to be released may be either above or below the atmospheric pressure, and the atmosphere to be released is usually one at normal pressure.

The pre-expanded particles obtained in this way have a temperature at the time of expansion,
Pressure 2 Although it varies depending on the amount of foaming agent O, etc., it usually has an apparent foaming strength of 3 to 60 times.

Once the pre-expanded particles are folded, they are ripened at room temperature and pressure.

Next, the mixture is aged under pressure at a predetermined temperature and pressure using a combined inorganic gas, a volatile blowing agent, and an Os gas. Inorganic gases include air and nitrogen.

Argon, helium, etc. are used.

In the present invention, the above-mentioned pre-expanded particles are filled into a forming mold having small holes through which a heating medium such as water vapor passes.
For example, a foamed laminate of 1.0 to t s kg/ai (G) is obtained by heating and foaming using 4D water vapor, followed by drawing and IILIIA. The suction in the drying process is usually preferably carried out while the temperature of the body is 100° C. or higher, and is preferably carried out using a vacuum pump such as an ejector or booster.

A general outline of the above layering and drying process is shown in FIG. 111111, 1a Seihou Kinuma.

2 is the line, S is the second constituent layer, and 4Fi is aiii.

sHiro polypropylene-based IIIljIm preliminary particles,
L7a steam wealth, I is ^ pressure steam pipe, ■, 1, 嬬 steam pressure needle.

11・l! is the steam supply valve, II, 14 is the steam supply pipe, II, l@ is the drain pipe, 17.1, the drain valve, 191 is the intermittent pipe,! 1. ! 2 Hiro dialect.

! s company vacuum needle, 24 is a suction device, 2B#i steam passage hole.

In the present invention, after suction drying, the foamed laminate is taken out from the gold layer, and while the laminate is at a temperature of 50° C. or higher, it is wrapped with a heat insulating material and slowly cooled. Examples of heat insulating materials that can be used include foamed polyolefin sheets.

Foamed beads inner weifeng body sugar manufacturing 2 expanded polystyrene board a
S, single cardboard box, etc., usually 0.02 ~
It has a thermal conductivity of 0.50 kalE/m-hr·'to. When wrapped with heat insulating material, 1 body of temperature ore 5
11. The temperature is preferably 0°C or higher. <The temperature is 70°C or higher. When this temperature is less than 50° C., the laminate becomes ineffective when wrapped with wire insulation material. When the laminated body is removed from the gold mass, the contact pressure (1 m pressure) between the stratified body and the gold mass is 1.2 Y/-.
It is preferable to deposit the following.

According to the present invention), the materials used in the storage of the polypyrene-based resin reserve particles are 1. For example, cushioning materials, thermal materials, packaging materials, 1. food materials, flotation materials, toys, etc. It can be used for.

That’s all! As a matter of fact, according to the present product wAK, the weight of the laminated foam is 1 *, and since the inside of the foam is suctioned and dried, drying equipment must be installed separately! There is no need to carry out the work of transporting the stratified material into and out of the drying stage 11. te.

Since the poly 1 μ pyrene resin preformed fIA particles have a high molding temperature, the residual heat of the gold layer can be used for drying, resulting in less energy consumption. Furthermore, according to the present invention, after suction drying the foamed laminate, the laminate is wrapped with a heat insulating material in a cage at a temperature of 50° C. or higher and slowly cooled, so that a good foamed laminate with little shrinkage can be obtained. It is possible.

Hereinafter, the present invention will be explained in more detail by referring to Example II and Comparative Examples.

Example 111 Add 5 parts by weight of ethylene-propylene random copolymer 100 parts by weight to 0 parts by weight of ethylene-propylene random copolymer.
20 parts by weight of methane, 0.5 parts by weight of finely divided aluminum oxide, and 30 parts by weight of water were placed in a container, and the temperature was raised to 145°C at a moderate rate of 2°C/min while stirring, and the pressure within +5nrt was set to 30. While maintaining #/j (Q), one end of the SS was opened and the polymer particles and water were released into the atmosphere at the same time to obtain pre-expanded particles with an expansion ratio of 30 times. The obtained pre-expanded particles were incubated in air at t 5 kIi/aj (G) for 50 hours, and after drying, the particles had a thickness of 60 mg, 300 m, and a length of 3005 m.
Fill the gold layer to avoid the risk of wetting.

Bone) Pressure L5~4.5kg/W steam 9 Heat and foam. Then, the supply of steam was stopped, and the mixture was dehydrated for 2 minutes in a 11001H oven to obtain a dry Li-foam layered footwear.

Examples f12 to 8 and Comparative Examples 1 to 3 After the foamed laminate obtained by performing the same operation as in Example 1 was taken out from the mold, the temperature of the welding body was different and the condition was good, and the thermal conductivity was 0.0. ! It was packaged in a 5° thick polypropylene resin power generator container of 14 kaE/m-le·°C and slowly cooled.

Obtained 9 shots and observed 0 contraction condition. In addition, the foamed laminate was cooled without being wrapped in iimi material taken out from the shoe, and the state of the round object was observed.

The results are shown in table s1.

纂　l＃I

[Brief explanation of the drawing]

Figure Ii Tsumagi shows an embodiment of the present invention,
1 is a schematic diagram showing the layering process and drying process of the present invention. 1-111 abused gold resin 5--Polypropylene resin pre-expanded particles

Claims (1)

[Claims] (1) Fill the pre-expanded resin particles into the punching metal tube, and after the heat foaming process, dry the particles by pulling the foam. A method for producing a pre-expanded polypropylene resin particle in-fill body, characterized by: (Fill the polypropylene-based am pre-foamed particles into the molding machine, and after foaming, dry it by pulling 1.) Then take out the molded body from the molding machine. 2. A method for producing a pre-expanded polypropylene resin pre-expanded particle interlayer structure, which comprises slowly cooling the laminate at a temperature of 50° C. or higher at a temperature of 50° C. or higher.