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Polyacetal resin composition

A technology of polyacetal resin and polyacetal copolymer, which can be used in machines/engines, fuel injection pumps, mechanical equipment, etc., can solve the problems of deterioration of polyacetal resin, huge cost of desulfurization equipment, etc., and achieve long-term heat resistance. Good properties and the effect of suppressing the generation of mold fouling

Active Publication Date: 2020-11-27
POLYPLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, desulfurization equipment consumes huge costs, so high-sulfur fuels are still in circulation in some countries
These high-sulfur fuels tend to deteriorate polyacetal resins more easily than low-sulfur fuels

Method used

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Embodiment

[0075] Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to them.

[0076] The various ingredients in Table 1 are shown below. The units in the table are parts by mass.

[0077] ●Polyacetal copolymer (A)

[0078] A-1: Polyacetal copolymer [hemiformal terminal group amount = 0.4 mmol / kg, melt index = 9 g / 10 minutes]

[0079] A-2: Polyacetal copolymer [hemiformal terminal group amount = 0.7 mmol / kg, melt index = 9 g / 10 minutes]

[0080] A-3: Polyacetal copolymer [hemiformal terminal group amount = 1.0 mmol / kg, melt index = 9 g / 10 minutes]

[0081] Polyacetal copolymers A-1 to A-3 were prepared as follows.

[0082] A-1: A mixture of 96.7% by mass of trioxane and 3.3% by mass of 1,3-dioxolane is continuously supplied to a twin-screw paddle type continuous polymerizer, and boron trifluoride is added as a catalyst 10ppm for polymerization. In addition, the mixture of trioxane and 1,3-dioxolane used for polymerization contain...

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Abstract

Provided is a polyacetal resin composition capable of minimizing degradation when a molded body thereof comes into contact with an acidic detergent. The present invention provides a polyacetal resin composition containing, with respect to (A) 100 parts by mass of a polyacetal copolymer in which the amount of a hemiformal terminal group is 0.8 mmol / kg or less, (B) more than 1.0 parts by mass and atmost 5.0 parts by mass of a hindered phenol-based antioxidant, and (C) more than 4.0 parts by mass and at most 30 parts by mass of magnesium oxide.

Description

technical field [0001] The present invention relates to a polyacetal resin composition having high resistance to acid components. Background technique [0002] Polyacetal resins are excellent in chemical resistance, and therefore molded articles made of polyacetal resins are widely used as automotive components. For example, it is used as a large component such as a fuel delivery unit represented by a fuel contact body such as a fuel pump module that directly contacts fuel oil. [0003] In recent years, low-sulfurization of fuel has been promoted in response to environmental regulations of various countries. However, desulfurization equipment consumes huge costs, so high-sulfur fuels are still in circulation in some countries. These high-sulfur fuels tend to deteriorate the polyacetal resin more easily than low-sulfur fuels. [0004] With regard to these problems, the present applicant reported that polyacetal resins contained alkaline earth metal oxides, polyalkylene gly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L59/00C08G2/24C08K3/22C08K5/134C08L59/04F02M59/44
CPCC08K3/22C08L59/00F02M59/44C08K2003/222C08K5/134C08L71/02C08L59/04C08K5/005C08G2/24C08K5/13F02M59/445F02M2200/9015
Inventor 荒井博树门间智宏
Owner POLYPLASTICS CO LTD
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