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Polyvinylidene fluoride resin expanded beads, method for producing polyvinylidene fluoride resin expanded beads, and molded articles of polyvinylidene fluoride resin expanded beads

A technology of polyvinylidene fluoride and expanded particles, which is applied in the field of polyvinylidene fluoride-based resin expanded particle moldings, which can solve the problems of lack of freedom in the shape of foams, and achieve excellent in-mold formability and not easy to shrink , the effect of low apparent density

Inactive Publication Date: 2014-06-25
JSP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the foam obtained in Patent Document 2 is also in the form of a sheet, and the degree of freedom in the shape of the foam is still lacking.

Method used

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  • Polyvinylidene fluoride resin expanded beads, method for producing polyvinylidene fluoride resin expanded beads, and molded articles of polyvinylidene fluoride resin expanded beads
  • Polyvinylidene fluoride resin expanded beads, method for producing polyvinylidene fluoride resin expanded beads, and molded articles of polyvinylidene fluoride resin expanded beads
  • Polyvinylidene fluoride resin expanded beads, method for producing polyvinylidene fluoride resin expanded beads, and molded articles of polyvinylidene fluoride resin expanded beads

Examples

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preparation example Construction

[0043] The present invention relates to a polyvinylidene fluoride resin expanded particle using polyvinylidene fluoride resin as base resin and a preparation method thereof.

[0044] The polyvinylidene fluoride-based resin expanded particle of the present invention is a polyvinylidene fluoride-based polyvinylidene fluoride-based resin having a flexural modulus of 450 MPa or more and a melt flow rate (MFR) of 1 g / 10 minutes or more at 230° C. and a load of 2.16 kg. Resin is used as the base resin.

[0045] In addition, the apparent density of the expanded particles is 25 to 150 g / L, and the closed cell ratio is 80% or more.

[0046] The expanded polyvinylidene fluoride-based resin particles of the present invention are preferably prepared by a method of dispersing the resin particles using the above-mentioned polyvinylidene fluoride-based resin as a base resin in a dispersion medium in an airtight container, and heating the particles to disperse them in a dispersion medium. Af...

Embodiment 1

[0149] (Preparation of resin particles)

[0150] To the polyvinylidene fluoride-based resin (Resin 1) shown in Table 1, 0.15 parts by weight of a cell regulator PTFE (polytetrafluoroethylene) was added with respect to 100 parts by weight of the polyvinylidene fluoride-based resin, and the inner diameter was 40 mm. The single-screw extruder is melt-kneaded, and the kneaded product is extruded into a strand-like shape (strand-like) from a small hole of a joint (pin) attached to the front end of the extruder, and the strand is cooled and cut to obtain a The resin particle weight is about 1.3 mg of resin particles.

[0151] (Preparation of expanded particles)

[0152] 1 kg of the above-mentioned resin particles was put into a 5 L pressure-resistant airtight container equipped with a stirrer together with 3 L of water as a dispersion medium. Further, 0.3 part by weight of kaolin as a dispersant, 0.004 part by weight of sodium alkylbenzenesulfonate as a surfactant, and 0.01 part b...

Embodiment 2

[0158] Resin particles and expanded particles (primary foaming) were obtained in the same manner as in Example 1, except that the conditions shown in Table 2 were changed to those shown in Table 3. Further, after applying the internal pressure shown in Table 3, secondary foaming was performed under the conditions shown in Table 3, and expanded particles with a low apparent density were obtained. The internal pressure shown in Table 3 is applied to this expanded particle, the expanded particle having applied this internal pressure is filled into the cavity of the above-mentioned flat-plate molding die, and a mold based on steam heating with the steam pressure shown in Table 3 is carried out. Internal molding was performed to obtain a plate-shaped expanded particle molded body having the same shape as in Example 1. The expanded particle molded body was maintained in an oven at 80° C. for 12 hours to obtain a polyvinylidene fluoride-based resin expanded particle molded body.

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Abstract

There is provided polyvinylidene fluoride resin expanded beads which have a high expansion ratio, do not shrink easily, and are capable of obtaining a molded article of the expanded beads that is excellent in mold reproducibility and dimensional stability. The polyvinylidene fluoride resin expanded beads include a polyvinylidene fluoride resin as a base resin, in which a flexural modulus of the polyvinylidene fluoride resin is 450 MPa or more, a melt flow rate (MFR) of the polyvinylidene fluoride resin is 1 g / 10 min or more at 230 DEG C and 2.16 kg load, an apparent density of the expanded beads is 25 to 150 g / L, and a closed cell content of the expanded beads is 80% or more.

Description

technical field [0001] The invention relates to a polyvinylidene fluoride resin expanded particle, a preparation method of the polyvinylidene fluoride resin expanded particle, and a polyvinylidene fluoride resin expanded particle molded body. Background technique [0002] Polyvinylidene fluoride-based resins are used as non-polluting raw materials, and are used as components of clean rooms or components of high-performance analytical instruments. Further, since the polyvinylidene fluoride-based resin has excellent weather resistance, it can also be used for exterior paints. In addition, polyvinylidene fluoride-based resins are excellent in flame retardancy, and are also used in the field of flame retardant applications. [0003] As a polyvinylidene fluoride-based resin foam, it is known that after a polyvinylidene fluoride-based resin as a raw material is subjected to a cross-linking treatment, a decomposable foaming agent that decomposes at the melting temperature of the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08J9/18
CPCC08J9/18C08F214/22C08F14/22C08L27/16C08J9/122C08J9/125C08J9/232C08J2201/034C08J2203/06C08J2203/10C08J2205/044C08J2205/052C08J2327/16
Inventor 篠原充及川政春
Owner JSP CORP
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