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Resin composition having excellent recoverability and multilayer structure using same

A resin composition and multi-layer structure technology, applied in recycling technology, synthetic resin layered products, packaging recycling, etc., can solve the problems of adhesion of deteriorated products, insufficient impact resistance, difficult continuous melt forming, etc. Good melt formability and excellent impact resistance

Pending Publication Date: 2022-07-12
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when recycling the recycled material of the multilayer structure including the PO layer and the EVOH layer, gelation occurs due to thermal deterioration during melt molding, or the deteriorated product adheres to the inside of the extruder, and it is difficult to carry out long-term continuous melt forming
In addition, there is also a problem that the appearance deteriorates due to the incorporation of such deteriorated products into the molded product.
Furthermore, the multilayer structure having the resin composition layer containing such recyclables may not have sufficient impact resistance.

Method used

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  • Resin composition having excellent recoverability and multilayer structure using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0105] Hereinafter, the present invention will be described in more detail using examples, but the present invention is not limited to these examples.

[0106]

[0107] (1) MFR

[0108] For resins used in Examples and Comparative Examples, MFR (g / 10 minutes) was measured using a melt index meter in accordance with JIS K 7210:2014. The temperature and load vary according to the kind of resin.

[0109] (2) Glass transition temperature

[0110] For resins used in Examples and Comparative Examples, using RHEOGEL E 4000 manufactured by UBM, the glass transition temperature was measured under the following conditions by a dynamic viscoelasticity measurement method. In addition, the peak temperature of Tan (delta) was made into glass transition temperature.

[0111] Temperature range: -100℃~+40℃

[0112] Heating rate: 3°C / min (step size 3°C)

[0113] Fundamental frequency: 11Hz (sine wave)

[0114] Clamp Gap: 20mm

[0115] Test piece size: width 5 mm, thickness 200 μm, lengt...

Embodiment 2～12、 comparative example 1～5

[0184] Except that the types of PO (A), EVOH (B), acid-modified PO (C) and acid-modified PO (D) and the amounts of each component were changed as described in Table 1, the same 1 The recovery aid and resin composition pellets were prepared and evaluated in the same manner. The evaluation results are shown in Table 1. It should be noted that, in the case of blending a plurality of resins with the recovery aid, after dry blending in advance, granulation was performed under the same conditions as in Example 1 to prepare the recovery aid.

Embodiment 13

[0186] Using PO (A-1), EVOH (B-1), and acid-modified PO (C1-1), extruded at 210°C using a blow molding machine "TB-ST-6T" manufactured by Suzuki Works (inside) PO(A-1) layer / acid-modified PO(C1-1) layer / EVOH(B-1) layer / acid-modified PO(C1-1) layer / PO(A-1) layer (outside) 3 types 5-layer parison, blow-molded in a mold at 15°C, cooled for 20 seconds, and the entire layer thickness was 3450 μm [(inside) PO (A-1) layer / acid-modified PO (C1-1) layer / EVOH (B- 1) A 500 ml container of layer / acid-modified PO(C1-1) layer / PO(A-1) layer (outside)=1500 / 150 / 150 / 150 / 1500] was formed. After the obtained container was pulverized, 2 parts by mass of the recovery aid (particles of acid-modified PO (D-1)) produced in Example 1 was added to 115 parts by mass of the obtained pulverized product, and the same method as in Example 1 was used. Method Resin composition pellets were produced and evaluated. The results are shown in Table 1.

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Abstract

A resin composition containing 0.1-20 parts by mass of an ethylene-vinyl alcohol copolymer (B), 0.1-20 parts by mass of an acid-modified polyolefin (C), and 0.1-10 parts by mass of an acid-modified polyolefin (D) per 100 parts by mass of a polyolefin (A), the ethylene unit content of (B) being 15-60 mol%, the degree of saponification being 85 mol% or more, the density of (A) being 0.89 g / cm3 or more and less than 0.97 g / cm3, the density of (C) being 0.89 g / cm3 or more and less than 0.97 g / cm3, and the density of (D) being 0.85 g / cm3 or more and less than 0.89 g / cm3 or more and less than 0.89 g / cm3 or more, and the glass transition temperature measured by dynamic viscoelasticity measurement is-30 DEG C or less. The resin composition has good melt moldability, and the amount of deteriorated substances adhering to a screw or a die head is small even when melt molding is continuously performed for a long time. In addition, by using this resin composition, a molded article having excellent impact resistance at low temperatures can be obtained.

Description

technical field [0001] The present invention relates to a resin composition containing a polyolefin and an ethylene-vinyl alcohol copolymer, a method for producing the same, and a multilayer structure, a molded article, and a fuel container using the resin composition. Moreover, it relates to the recovery aid used for manufacture of the multilayer structure using the said resin composition, etc.. Background technique [0002] At present, for a multilayer structure comprising a polyolefin (hereinafter abbreviated as "PO") layer and an ethylene-vinyl alcohol copolymer (hereinafter sometimes abbreviated as "EVOH") layer having excellent barrier properties, it has been effectively utilized. Barrier properties are used for various applications such as food packaging containers and fuel containers. Such multilayer structures are used as various molded articles such as films, sheets, cups, trays, and bottles. In this case, edges, defective products, etc., which are generated when...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/02C08L23/26C08L29/04B32B1/02B32B7/027B32B27/32B65D65/40B32B1/00
CPCB32B7/027B32B27/32B65D65/40C08L23/02C08L23/26C08L29/04B32B1/00
Inventor 伊藤优清水裕司铃木真
Owner KURARAY CO LTD
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