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Polyacetal resin composition

一种聚缩醛树脂、组合物的技术，应用在聚缩醛树脂组合物领域，能够解决很难耐候性外观、热稳定性或耐光性降低、加成性不成立等问题，达到耐候(光)性优异、抑制氧化分解、抑制解聚的效果

Active Publication Date: 2009-09-23
POLYPLASTICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, simply combining the above-mentioned technologies does not result in additive effects. Especially when hindered phenols and hindered amines are used in combination, thermal stability or light resistance will be reduced due to antagonism, and it is difficult to obtain excellent weather resistance. Resin material that significantly suppresses the generation of formaldehyde and has no problems such as poor appearance caused by bleeding of mixed components

Method used

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Embodiment 1～13

[0136] In accordance with the ratio shown in Table 1, hindered phenol antioxidants, guanamine compounds, and piperidine derivatives whose nitrogen is a tertiary nitrogen hindered amine stabilizer, ultraviolet absorber, fatty acid formed from fatty acid and polyalkylene glycol Ester, polyalkylene glycol, and other compounds are premixed with 100 parts by weight of polyacetal copolymer with specific polymer quality indicators, and then put into a twin-screw extruder with a vent and a diameter of 30 mm The main feed port is melted and mixed (extrusion conditions: L / D=35, extrusion temperature=200°C, screw rotation=120rpm, exhaust vacuum=-700mmHg, output=18kg / hour) to prepare pellets状的Composition. In addition, for weathering (light) resistance and exudation evaluation, 0.3 parts by weight of the pigment (iron iron) and 100 parts by weight of the granular composition were mixed, and then put into a double vent with a diameter of 30 mm. The main feed port of the screw extruder is melted...

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Abstract

The present invention provides a polyacetal resin composition having an excellent processability and stability, significantly suppressing the generation of formaldehyde from molded articles thereof, preventing exudation of components, and being excellent in weathering (light) resistance. Specifically, (A) a polyacetal copolymer having 1.0 mmol / kg or smaller quantity of a hemiformal terminal group, 2.0 mmol / kg or smaller quantity of a formyl terminal group, and 0.5% by weight or smaller quantity of an unstable terminal group is blended with (B) a hindered phenol-based antioxidant; (C) at least one compound selected from (c-1) a guanamine compound and (c-2) a hydrazide compound; (D) a hindered amine stabilizer in which the nitrogen in a piperidine derivative having a steric hindrance group is tertiary; and (E) a UV absorber in specified quantities and mixing ratios.

Description

Technical field [0001] The present invention relates to a polyacetal resin composition that has excellent processability and stability, significantly suppresses the amount of formaldehyde generated from its molded product, prevents bleeding of mixed components, and is excellent in weathering (light) resistance. Background technique [0002] Polyacetal resin has various excellent characteristics, and its molded products are used in a wide range of fields, but from the point of view of its chemical structure characteristics, it has the property of being easily decomposed under heating oxidizing atmosphere and acidic or alkaline conditions. Therefore, examples of the problems of polyacetal resins include high thermal stability and suppression of formaldehyde generation from molding processes or molded products. When the thermal stability is low, the polymer is decomposed by heating during processing steps such as extrusion or molding, and deposits (mold deposits) are generated on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L59/04C08K5/13C08K5/20C08K5/24C08K5/3432C08K5/3475C08K5/3477
CPCC08L59/00C08K5/005C08K2201/014
Inventor 长谷宽之
Owner POLYPLASTICS CO LTD
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