Pre-expanded particles or crystalline aromatic polyester-based resin, and in-mold expanded product and expanded laminated using the same

A foam molding and aromatic technology, applied in the direction of synthetic resin layered products, layered products, chemical instruments and methods, etc., can solve the problems of fast crystallization of resin and inability to manufacture in-mold foam moldings, etc. Achieve the effect of smooth surface, good appearance and superior mechanical strength

Inactive Publication Date: 2002-01-30
SEKISUI PLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, since general-purpose PET is used in the above-mentioned in-mold foam molding method, the crystallization rate of the resin is very fast.
[0017] Therefore, although the weldability can be improved to a certain extent (the weld rate is about 30%), and an in-mold foam molded article can be produced, it is impossible to manufacture a mold with excellent mechanical strength and the like that can increase the weld rate to 40% or more. Inner foam molding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0240] Except for using 100 parts by weight of No. 2 resin described in Table 1 above as the aromatic polyester resin, pre-expanded particles were produced in the same manner as in Example 1, and an in-mold expanded molded article was obtained.

[0241] The bulk density of pre-expanded particles is 0.12g / cm 3 , the degree of crystallinity is 2.6%, and the crystallization peak temperature is 154.3°C. Moreover, the content rate of the said pre-expanded particle IPA unit was 5.8 weight%, and the content rate of the CHDM unit was 0 weight%.

[0242] In-mold foaming molding is a good molding without gaps between particles, and its apparent density is 0.12g / cm 3 , The welding rate is 92%, showing good welding property, the bending strength is 1.19MPa, and the deflection is 10.6mm, which is high strength.

Embodiment 3

[0244] Except using 85 parts by weight of No. 1 resin and 15 parts by weight of No. 3 resin described in Table 1 above as the aromatic polyester resin, the same operation as in Example 1 was used to manufacture pre-expanded particles and obtain in-mold foam molding. body.

[0245] The bulk density of pre-expanded particles is 0.12g / cm 3 , the degree of crystallinity is 4.0%, and the crystallization peak temperature is 136.7°C. Moreover, the content ratio of the said pre-expanded particle IPA unit was 0 weight%, and the content ratio of the CHDM unit was 2.6 weight%.

[0246] The apparent density of the in-mold foam molding is 0.12g / cm 3 , The welding rate is 68%, showing good welding property, the bending strength is 1.02MPa, and the deflection is 3.42mm, which is high strength.

[0247] In the bending test of the in-mold foamed molded body obtained in the above-mentioned Embodiments 1 to 3, when the fracture surface of the broken molded body was observed, since each weldin...

Embodiment 4

[0249] Extrude the sheet-shaped extruded foam [apparent density: 0.2 g / cm3 before cutting] manufactured in the same manner as in Example 2 3 , Thickness: 1.0mm] Formed in food containers by hot plate forming machine. The molding conditions at this time were that the temperature of the hot plate was 120° C., the heating time was 4 seconds, the temperature of the molding die was 25° C., and the molding time was 6 seconds. Moreover, the shape of a container is 120 mm in width, 150 mm in length, and 25 mm in height.

[0250] This container was cut into a sheet shape of about 5×3 mm by a cutting machine, and used as pre-expanded particles, and the same procedure as in Example 2 was used to obtain an in-mold expanded molded product.

[0251] The bulk density of pre-expanded particles is 0.08g / cm 3 , the degree of crystallinity is 2.9%, and the crystallization peak temperature is 154.5°C. Moreover, the content rate of the said pre-expanded particle IPA unit was 5.8 weight%, and th...

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Abstract

Pre-expanded particles of crystalline aromatic polyester-based resin which is excellent in expansion fusion bonding during expansion molding, and an in-mold expanded product being improved particularly in fusion bonding ratio and mechanical strength and an expanded laminate using the pre-expanded particles. The pre-expanded particles have a bulk density of 0.01 to 1.0 g/cm<3> and a peak temperature of crystallization of 130 to 180 DEG C, and can be suitably used in in-mold expansion molding. The in-mold expanded product is formed by the in-mold expansion molding of the above pre-expanded particles, and the expanded laminate is prepared by laminating a film or sheet of an aromatic polyester-based resin directly on the above in-mold expanded product and forming them in one piece.

Description

[technical field] [0001] The present invention relates to pre-expanded particles of crystalline aromatic polyester resin excellent in foaming weldability during in-mold foam molding, and in-mold foaming capable of improving welding rate and mechanical strength by using the pre-expanded particles Molded bodies and foam laminates. [Background technique] [0002] Aromatic polyester resins have excellent properties such as high rigidity, good shape stability, heat resistance and chemical resistance, which are not possessed by polystyrene or polyolefin. [0003] Through the foaming of aromatic polyester-based resins, it is expected to produce in-mold foamed molded articles that are lightweight and excellent in heat resistance, heat insulation, cushioning, and chemical resistance. [0004] Conventionally used aromatic polyester resins (general-purpose PET) are mainly synthesized by polycondensation reaction of terephthalic acid, which is a dicarboxylic acid, and ethylene glycol, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C44/14B29C44/34B29C44/44B32B5/18B32B27/36C08J9/16
CPCB29C44/3415B29C44/14C08J9/16B32B5/18B32B27/36C08J2367/00B29C44/445B29C44/3426
Inventor 平井孝明藤岛稔上野裕之松村英保森冈郁雄中山新平
Owner SEKISUI PLASTICS CO LTD
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