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Polypropylene molded article, sheet-like polypropylene molded article, and method for production of polypropylene thermally molded article

A manufacturing method and technology of polypropylene, applied in the direction of flat products, applications, household appliances, etc., can solve the problems of difficulty in satisfying rigidity and transparency, difficulty in obtaining molded products, and high dimensional accuracy, and achieve transparency, cost reduction, and thickness The effect of size reduction

Active Publication Date: 2010-03-31
IDEMITSU UNITECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, in the various conventional methods described in Patent Document 1 to Patent Document 5, it is difficult to satisfy both higher rigidity and transparency.
That is, it is difficult to obtain a molded product that maintains high transparency and has high rigidity that has not been achieved before. In addition, in the case of a thermoformed product, it is difficult to obtain a green sheet for thermoforming with less deformation and high dimensional accuracy.

Method used

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  • Polypropylene molded article, sheet-like polypropylene molded article, and method for production of polypropylene thermally molded article
  • Polypropylene molded article, sheet-like polypropylene molded article, and method for production of polypropylene thermally molded article
  • Polypropylene molded article, sheet-like polypropylene molded article, and method for production of polypropylene thermally molded article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、4、5、7、8、9

[0208] Examples 1, 4, 5, 7, 8, 9 (based on the melt extrusion flow rapid cooling condition A of the test machine)

[0209] Specifically, under the conditions described below, an extrusion step using a screw-type single-screw extruder was implemented.

[0210] ·Screw: Full thread type, compression ratio of 3.5, 65mmФ

[0211] ·Screw speed: 70rpm (the discharge rate is about 45kg / hour constant)

[0212] ·T mold: coat hanger type (width 800mm, mold lip opening 1.5mm)

[0213] ·Extrusion temperature: 240℃

[0214] ·Extrusion speed (V 0 ): 0.57m per minute

[0215] ·Air gap (La): 150mm

[0216] The cooling process including the metal belt and the metal roll is the conditions described below.

[0217] ·Temperature: 20℃

[0218] ·Roller diameter: 270mmФ

[0219] ·Roll angle with contact part: 50°

[0220] Here, the angle of the roller with contact part is based on Japanese Patent Laid-Open No. 9-136346 figure 1 The sum of θ1 and θ2 disclosed in.

[0221] ·Pulling speed (V): (1.2 / t)m / min

[0222] Here, ...

Embodiment 2、3、6、10、11、14、15、16

[0226] Examples 2, 3, 6, 10, 11, 14, 15, 16 (using the melt extrusion flow rapid cooling condition B of the testing machine)

[0227] Specifically, under the conditions described below, an extrusion step using a screw-type single-screw extruder was implemented.

[0228] ·Screw: Full thread type, compression ratio of 3.5, 65mmФ

[0229] ·Screw speed: 125rpm (discharge rate: about 80kg / hour)

[0230] ·T mold: clothes hanger type (width 800mm, mold lip opening 2.0mm)

[0231] ·Extrusion temperature; 240℃

[0232] ·Extrusion speed (V 0 ): 1.2m per minute

[0233] ·Air gap (La): 150mm

[0234] The cooling process including the metal belt and the opposing metal roll is the conditions described below.

[0235] ·Temperature: 20℃

[0236] ·Roller diameter: 270mmФ

[0237] ·Roll angle with contact part: 50°

[0238] ·Pulling speed (V): (2.1 / t)m / min

[0239] Here, t represents the sheet thickness (mm).

[0240] ·Cooling time: 0.68[sec]×t / 0.1

[0241] Here, the cooling time is obtained by dividing the circum...

Embodiment 12、13

[0242] Example 12, 13 (Using the melt extrusion flow rapid cooling condition C of commercial equipment)

[0243] Specifically, under the conditions described below, an extrusion step using a screw-type single-screw extruder was implemented.

[0244] ·Screw: Full thread type, compression ratio of 3.5, 65mmФ

[0245] ·Screw speed: 86rpm (about 540kg / hour)

[0246] ·T mold: clothes hanger type (width 1100mm, mold lip opening 1.5mm)

[0247] ·Extrusion temperature: 240℃

[0248] ·Extrusion speed (V 0 ): 6.1m per minute

[0249] ·Air gap (La): 150mm

[0250] The cooling process including the metal belt and the opposing metal roll is the conditions described below.

[0251] ·Temperature: 18℃

[0252] ·Roller diameter: 600mmФ

[0253] ·Roll angle with contact part: 50°

[0254] ·Average pulling speed: (9.0 / t)m / min

[0255] Here, t represents the sheet thickness (mm).

[0256] ·Cooling time: 0.367[sec]×t / 0.1

[0257] Here, t represents the sheet thickness (mm).

[0258] (Heat treatment process)

[0259] Th...

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Abstract

A molten polypropylene having such a stereoregularity that the isotactic pentad fraction is 95% by mole or more is allowed to flow. The molten polypropylene is cooled to a temperature of -200 to 50 DEG C (inclusive), and is maintained at that temperature for 0.1 to 100 seconds (inclusive), thereby producing a rapidly cooled polypropylene high-order structure mainly composed of a mesophase or monoclinic domain having a size of 100 nm or smaller and an amorphous phase. The rapidly cooled polypropylene high-order structure is heated to a temperature that falls within a temperature range in which endothermic transfer occurs and that is equal to orlower than the melting temperature of the polypropylene.

Description

Technical field [0001] The present invention relates to a polypropylene molded product having stereoregularity with an isotactic pentad fraction of 95 mol% or more, and a sheet-like polypropylene molded product for thermoforming the polypropylene molded product And a method for producing polypropylene thermoformed products. Background technique [0002] In the past, in the field of transparent sheets, polyvinyl chloride (hereinafter abbreviated as PVC) resins were mostly used. However, in recent years, awareness of environmental temperature has increased, and new transparent sheets that replace PVC resins are being demanded. As such a sheet, a sheet containing polypropylene (hereinafter abbreviated as PP) has attracted attention. [0003] However, PP is a crystalline resin, and therefore, it may be insufficient in terms of transparency. In addition, even when the transparent sheet is mainly used in the field of packaging various articles, in terms of the characteristics of the sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/00B29C47/14B29C47/88B29K23/00B29L7/00B29C71/02B29C48/08B29C48/09B29C48/305
CPCB29C43/46B29C47/885B29C47/14B29C2043/5816B29C2043/486B29C47/8845B29C47/0021B29K2105/256B29C59/04B29C71/02B29C2043/463B29C43/222B29K2023/12B29C48/07B29C48/08B29C48/305B29C48/914B29C48/9145B29C48/9155Y10T428/24942Y10T428/1397B29C48/09
Inventor 藤原健一小高博
Owner IDEMITSU UNITECH CO LTD
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