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Stretching body made of polyoxymethylene resin and its preparation method

A technology of polyoxymethylene resin and drawing body, applied in the field of drawing body and preparation, can solve the problems of poor drawing processability and good productivity of homopolymer.

Inactive Publication Date: 2004-06-16
POLYPLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the technologies disclosed in these documents, in order to improve stretchability, the method of stretching in a pressurized fluid such as silicone oil is mainly used. In order to keep the fluid in a pressurized state, special stretching processing equipment is required. It is a process of washing and removing pressurized fluid such as silicone oil from the stretched body after stretching, so it cannot be said to be a technique with good productivity
In the examples of these documents, polyoxymethylene homopolymer was used. Due to the high crystallinity of the homopolymer, its stretching processability is poor, so it is speculated that it can only be applied to the special stretching in a pressurized fluid. Processing technology

Method used

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  • Stretching body made of polyoxymethylene resin and its preparation method
  • Stretching body made of polyoxymethylene resin and its preparation method
  • Stretching body made of polyoxymethylene resin and its preparation method

Examples

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Embodiment 1～11

[0033] Use a continuous mixing reactor with a jacket that passes through a hot (cold) medium on the outside, a barrel with two partially overlapping circular shapes in cross section and a rotating shaft with a stirring paddle. The rotating shafts are rotated at 150 rpm each, and liquid trioxane, cyclic ether or cyclic formal (1,3-dioxolane, 1,4-butanediene, etc. Alcohol methylal, ethylene glycol methylal), further add methylal as a molecular weight regulator, and at the same time continuously supply 50ppm of boron trifluoride (relative to all monomers) as a catalyst in the polymerizer for bulk Polymerization was prepared into polymers with the amount of comonomers shown in Table 1. The reaction product discharged from the polymerizer immediately passed through a crusher, and was added to an aqueous solution containing 0.05% by weight of triethylamine at 60° C. to deactivate the catalyst. Further, after separation, washing and drying, a crude polyoxymethylene copolymer was obt...

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Abstract

A stretched product comprising a polyoxymethylene copolymer and having high strength and high elastic modulas is provided. A polyoxymethylene copolymer having a melt index (190 DEG C., load: 2160 g) of from 0.3 to 20 g / 10 min and containing, in the polymer chain mainly comprising an oxymethylene repeating unit, a specific oxyalkylene unit in an amount of from 0.5 to 10 mol per 100 mol of the oxymethylene unit is melt-extruded to obtain a rod-like or hollow molded article and then the molded article is stretched under heating, thereby obtaining a stretched product having a sectional area of from 0.003 to 700 mm2.

Description

technical field [0001] The invention relates to a stretched body made of polyoxymethylene copolymer and a preparation method. Background technique [0002] Conventional stretched resin bodies are mostly formed of polyolefin resins such as polypropylene and polyethylene. Since they are relatively inexpensive, they are widely used for various purposes such as building materials. However, due to the low crystallinity of polyolefin resin, the stretched body has limited strength after stretching, and the strength may not be sufficient depending on the application. Furthermore, it is not enough to cope with the demand for higher-strength stretched bodies in recent years, and the demand for secondary processed products such as textiles and geogrids made of such stretched bodies. [0003] On the other hand, as it is known, polyoxymethylene resin is a polymer with a polymer skeleton with formaldehyde as the main repeating unit. The advantages. Therefore, due to its fast crystalli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C55/00B29K59/00C08G2/18C08G2/20C08G2/24C08L59/04
CPCC08L59/04C08G2/20C08G2/24C08G2/18Y10T428/1352
Inventor 大川秀俊
Owner POLYPLASTICS CO LTD