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Polybutylenes resin, tubing and pipe fitting made from it

A polybutene and resin-like technology, applied in the direction of pipes/pipe joints/fittings, pipes, rigid pipes, etc., can solve problems such as poor appearance, unsatisfactory high-speed formability, narrowness, etc.

Inactive Publication Date: 2002-10-16
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the molecular weight distribution of poly-1-butene resin generally represented by the ratio of weight average molecular weight (Mw) to number average molecular weight (Mn) (Mw / Mn) is narrow below 3. When making pipes with a diameter of 30mm or less, it is considered as When the molding speed is low (below 3m / min), it can be molded well, but when it is molded at a high speed, the inner and outer surfaces of the obtained pipe are rough and the appearance is not good. In short, there is a problem with high-speed moldability
[0005] In order to improve the high-speed formability, the inventor once proposed to contain molecular weight distribution Mw / Mn below 6, and MFR is the poly-1-butene resin (A) of 0.01-5 and MFR is poly-1-butene resin ( A) The resin composition of poly-1-butene resin (B) more than 20 times (JP-A 5-9352), but the high-speed moldability of this polybutene resin is still unsatisfactory

Method used

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Examples

Experimental program
Comparison scheme
Effect test

reference example 2

[0107] [Preparation of solid titanium catalyst component (1)]

[0108] 6.0kg (63mol) of anhydrous magnesium chloride, 26.6L decane and 29.2L (189mol) of 2-ethylhexyl alcohol were heated and reacted at 140°C for 4 hours to form a uniform solution, and 2-isopropyl-2 - 1.59 kg (7.88 mol) of isobutyl-1,3-dimethoxypropane, stirred and mixed at 110° C. for 1 hour to obtain a uniform solution.

[0109] The obtained homogeneous solution was cooled to room temperature, and 37.0 kg of the solution was added dropwise to 120 L (1080 mol) of titanium tetrachloride maintained at -24° C. within 2.5 hours, and the resulting solution was heated to 110° C. within 6 hours. 0.68 kg (3.37 mol) of 2-isopropyl-2-isobutyl-1,3-dimethoxypropane was added.

[0110] The solution was stirred at 110° C. for 2 hours to react, and the solid was filtered out from the resulting mixture, and the solid was added to 132 L of titanium tetrachloride, and the obtained slurry was heated and reacted at 110° C. for 2 ...

Embodiment 1-5

[0128] The physical properties of the polybutene resin (5) are listed in Table 1. [Example 1-5, Comparative Example 1-2]

[0129] The polybutene resins 1-5 and the nucleating agent high-density polyethylene were mixed according to the ratio in Table 2 with a single-roll extruder to prepare polybutene resins with the physical properties shown in Table 2.

[0130] The obtained resin was extruded with an extruder (manufactured by Ikegai Iron Works Co., Ltd.; SX-90) through a die (inner diameter 18.8 mm, hole outer diameter 12.8 mm, die edge length 50 mm). The temperature conditions are set as follows, the extrusion rate is 10kg / h, and the pipe is melted and extruded from the mold.

[0131] C1 / C2 / C3 / C4 / C5 / Coupler / Gear Pump / D1 / D2 / D3=170 / 180 / 190 / 190 / 190 / 190 / 190 / 190 / 190 / 190.

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PUM

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Abstract

The present invention provides polybutene resin, which is characterized by: (1) more than 80-100 mol% of 1-butene units and 20 mol% of α-alkene (except 1-butene) units with 2-10 carbon atoms The following composition; (2) The melt flow rate (MFR) is 0.01-10g / 10min; (3) The molecular weight distribution represented by the ratio (Mw / Mn) of the weight average molecular weight (Mw) to the weight average molecular weight (Mn) is above 6 and (4) when the molecular weight distribution curve is drawn according to the chromatogram of gel permeation chromatography (GPC), measure the total area enclosed by the curve and the abscissa, and the part whose weight average molecular weight is 6×105 or more accounts for the total area More than 20%. The present invention also provides pipes and pipe fittings made of the above resin.

Description

technical field [0001] The present invention relates to polybutene resins, pipes and fittings made of them, especially polybutene resins with excellent creep resistance, pressure resistance and high-speed formability, and pipes and fittings made of them. pipe fittings. Background technique [0002] Traditionally, metal pipes such as steel pipes, copper pipes, or lead pipes mixed with lead have been used as piping materials for water supply and hot water supply. Steel pipes produce red water and black water due to rust, and copper pipes are prone to perforation and blue water due to electrical corrosion. In addition, it is difficult to reduce weight and manufacture large-diameter pipes, so pipes that do not cause the above problems are needed. At present The used pipes made of synthetic resins such as vinyl chloride resin, polyethylene and poly-1-butene have partially solved the problems of rust, electric corrosion and perforation. [0003] However, vinyl chloride resin has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L9/12C08F10/08C08F110/08C08F210/08C08L23/06C08L23/20F16L9/127
CPCC08F10/08C08F110/08C08F210/08C08L23/06C08L23/20F16L9/127C08F4/6543C08F4/651C08L2666/04C08F2500/12C08F2500/15C08F2500/04C08F210/06
Inventor 得居伸小宫干
Owner MITSUI CHEM INC
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