Polyacetal resin composition and molded article thereof

A technology of polyacetal resin and polyacetal copolymer, applied in the field of polyacetal resin composition and its molded products, can solve the problem of reducing formaldehyde, reducing the amount of trioxane elution and the amount of trioxane volatile organic compounds, etc. problems, to achieve the effect of improving weather resistance and improving the surrounding environment

Inactive Publication Date: 2006-12-06
POLYPLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in these conventional polyacetal resin compositions or molded articles thereof, it is difficult to reduce the eluted amount of trioxane or the amount of volatile organic compounds containing trioxane at a high level.
In addition, it is difficult to greatly reduce the amount of formaldehyde generated, especially the amount of formaldehyde generated from molded products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4、6～7、12～22、26～30

[0206] In 100 parts by weight of a polyacetal copolymer having a specific trioxane content, antioxidants, formaldehyde inhibitors, processing stabilizers, heat-resistant stabilizers, colorants, Weather-resistant (light) stabilizer, processing aid (water), then drop into the main feed port of a twin-screw extruder with a diameter of 1 vent (vent), carry out melt mixing (extrusion conditions: L / D=35, extrusion temperature=300°C, screw speed=100rpm, vent vacuum degree=70cmHg, ejection amount=15kg / hr, average residence time=100 seconds), prepare granular composition. This granule composition was heat-processed at 140 degreeC for 3 hours using the blast dryer in air atmosphere.

[0207] These pellets were molded into predetermined test pieces by an injection molding machine, and the amount of trioxane elution, the amount of volatile organic compounds, and the amount of formaldehyde generated from the predetermined test pieces were evaluated. The results are shown in Tables 1 to 3. ...

Embodiment 5、8～11、23

[0209] In 95 parts by weight of a polyacetal copolymer having a specific trioxane content, antioxidants, processing stabilizers, heat-resistant stabilizers, weather-resistant (light) stabilizers, Coloring agent, processing aid (water), prepare the premixed material, then use a twin-screw extruder with a diameter of 1 ventilating port to be a 30mm twin-screw extruder, drop into the premixed material from the main feed port, and carry out melt mixing (extrusion condition : L / D=35, extrusion temperature=200°C, screw speed=100rpm, vent vacuum=70cmHg, ejection amount=15kg / hr, average residence time=100 seconds), and then from the vent of extruder The last side feed port is fed with the mixed material of 5 parts by weight of polyacetal copolymer powder and formaldehyde inhibitor with the same trioxane content to prepare a granular composition. This granule composition was heat-processed at 140 degreeC for 3 hours using the blast dryer in air atmosphere.

[0210] These pellets were ...

Embodiment 24

[0212] The method shown below and heat treatment at 140° C. for 3 hours were repeated again to prepare a granular composition having a total residence time of 200 seconds. Described method is that the polyacetal resin composition particle that obtains in embodiment 7 is dropped into the main feed port that has the diameter of 1 ventilating port to be the main inlet of the twin-screw extruder of 30mm, carry out melt mixing (extrusion condition : L / D=35, extrusion temperature=200°C, screw speed=100rpm, vent vacuum degree=70cmHg, ejection amount=15kg / hr).

[0213] These pellets were molded into predetermined test pieces by an injection molding machine, and the amount of trioxane eluted from the test piece, the amount of volatile organic compounds, and the amount of formaldehyde produced were evaluated. The elution amount of trioxane is 0.38mg / kg, and the amount of formaldehyde generated is dry formula = 0.08μg / cm 2 , wet = 0.15μg / cm 2 , the amount of volatile organic compounds ...

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Abstract

A polyacetal resin composition which comprises a polyacetal resin having a trioxane content of 100 ppm or lower (desirably 50 ppm or lower, preferably 10 ppm or lower) and at least one stabilizer selected among an antioxidant, formaldehyde depressant, processing stabilizer, and heat stabilizer. The polyacetal resin may be a polyacetal resin (especially a copolyacetal) whose trioxane content has been reduced by a solvent treatment and / or heat treatment. The polyacetl resin composition may further contain at least one additive selected among a weathering (light) stabilizer, impact modifier, gloss control agent, sliding modifier, colorant, and filler. This polyacetal resin composition can give a molded article significantly reduced in trioxane extraction and / or volatile-organic amount.

Description

technical field [0001] The present invention relates to a polyacetal resin composition having a significantly reduced trioxane content, a method for producing the same, and a polyacetal formed from the resin composition and having a significantly reduced amount of eluted trioxane and / or volatile organic compounds Resin moldings. Background technique [0002] As polyacetal resins, polyacetal resin homopolymers and polyacetal resin copolymers (polyacetal copolymers) are known, and especially polyacetal resin copolymers excellent in thermal stability are used in many fields. The polyacetal resin copolymer can be manufactured through the following steps, that is, using trioxane as a monomer raw material, in the presence of a cationic polymerization catalyst, ethylene oxide, 1,3-dioxolane, diglycol Alcohol formal, 1,4-butanediol formal and other cyclic ethers or cyclic formals are copolymerized, followed by a post-polymerization catalyst deactivation process, terminal stabilizat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L59/00C08K3/00C08K5/00C08J5/00
CPCC08K5/005C08L59/00B29B11/10B29B9/06C08J5/00
Inventor 原科初彦栗田早人
Owner POLYPLASTICS CO LTD
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