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Weather-resistant polyformaldehyde composition and preparation method thereof

A polyoxymethylene compound and weather-resistant technology, applied in the field of weather-resistant polyoxymethylene compound and its preparation, can solve problems such as poor effect, and achieve the effects of reducing loss, improving weather resistance and improving stability

Active Publication Date: 2015-03-18
KAILUAN ENERGY CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent Publication CN 1196073A discloses a method of mixing polyoxymethylene with a vinyl polymer having primary amide groups and imide groups to improve the weather resistance of polyoxymethylene, but the effect is not good

Method used

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  • Weather-resistant polyformaldehyde composition and preparation method thereof
  • Weather-resistant polyformaldehyde composition and preparation method thereof
  • Weather-resistant polyformaldehyde composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: The weather-resistant polyoxymethylene compound adopts the following raw material formulation and preparation method.

[0028] Preparation steps: (1) Add the dispersant and polyoxymethylene into the mixer according to the following mass fractions, and stir at room temperature for 2 to 3 minutes until the mixture is uniform; separately add the ultraviolet absorber, light stabilizer, antioxidant, ultraviolet shielding agent, The free radical quencher and the formaldehyde absorbent are placed in a mixer and mixed evenly. (2) Put the mixed material into the twin-screw extruder through the hopper for melt blending and extrusion, and turn on the vacuum pump of the extruder. The temperature of each section from the barrel to the head is 170°C, 175°C, 175°C, 180°C, 185°C, 180°C, 178°C, 175°C, 170°C, the die temperature is 170°C, and the screw speed is 170 rpm , Feeding speed 10rpm. (3) The extruded melt strands are water-cooled, granulated, sieved, and fully dri...

Embodiment 2

[0038] Embodiment 2: The weather-resistant polyoxymethylene compound adopts the following raw material formulation and preparation method.

[0039] Preparation steps: The weather-resistant polyoxymethylene compound was prepared according to the method steps described in Example 1. After xenon lamp aging, thermo-oxygen aging and hydrothermal aging of the standard test sample for 1200h, the mechanical properties were compared with those of unaged POM. The results are shown in Tables 2, 3 and 4.

[0040] Each raw material is weighed according to the following mass fraction:

[0041] Polyoxymethylene copolymer 96.3wt.%;

[0042] Polymeric UV absorber: phenyl-5-methacrylate methyl salicylate vinyl acetate copolymer 0.6wt.%;

[0043] Polymeric stabilizer: 1,2,2,6,6-pentamethyl-4-pyridinol grafted styrene maleic anhydride copolymer 0.1wt.%;

[0044] Antioxidant: tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester 0.03wt.%, 1,3,5-tris(3,5-di-tert-butyl-...

Embodiment 3

[0049] Embodiment 3: The weather-resistant polyoxymethylene compound adopts the following raw material formulation and preparation method.

[0050] Preparation steps: except that the extrusion process conditions in step (2) are different, the rest is prepared according to the method described in Example 1 to prepare weather-resistant polyoxymethylene composites. The process conditions of step (2) in this example are: the screw speed is 150 rpm, the feeding speed is 12 rpm, the die temperature is 175 °C; the temperature of each section from the barrel to the machine head is 165 °C, 170 °C, 175 °C, and 180 °C , 185°C, 178°C, 175°C, 170°C, 165°C.

[0051] After xenon lamp aging, thermo-oxygen aging and hydrothermal aging of the standard test sample for 1200h, the mechanical properties were compared with those of unaged POM. The results are shown in Tables 2, 3 and 4.

[0052] Each raw material is weighed according to the following mass fraction:

[0053] Polyoxymethylene copoly...

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Abstract

The invention discloses a weather-resistant polyformaldehyde composition which is prepared from following raw materials, in a fusion manner, by mass, 91.5-97.5% of a copolymerized polyformaldehyde resin, 0.1-0.6% of a polymerization-type ultraviolet absorbent, 0.1-1.0% of a polymerization-type light stabilizer and 1.0-5.0% of an ultraviolet shield agent. In the polyformaldehyde composition, the large-molecularized ultraviolet absorbent and the large-molecularized light stabilizer are employed with addition of the ultraviolet shield agent, so that the polyformaldehyde composition can effectively absorb, shield and reflect ultraviolet in sun and prevent the ultraviolet from entering the polyformaldehyde, thereby effectively stopping photo-degradation of the polyformaldehyde, avoiding molecule chain interruption to form hydroxyl groups and carboxyl groups, so that the weather resistance of the polyformaldehyde composition is enhanced. In the invention, the ultraviolet absorbent and the light stabilizer are both large-molecularized ultraviolet absorbents so that the polyformaldehyde composition is excellent in weather resistance and meanwhile volatilization and migration of small molecules in an additive can be prevented. The polyformaldehyde composition is prolonged in service life under an illumination environment and a wet and hot environment, is increased in use value and can satisfy requirement in special fields.

Description

technical field [0001] The invention relates to a polyoxymethylene compound, in particular to a weather-resistant polyoxymethylene compound and a preparation method thereof. Background technique [0002] Polyoxymethylene contains -CH in the molecular chain 2 O-linked linear high molecular polymer, is a kind of high crystallinity, high density thermoplastic engineering plastics. Compared with polyethylene, polyoxymethylene has short carbon-oxygen bonds and high cohesive energy density, so it has a large density; polyoxymethylene molecular chains have greater flexibility and chain structure regularity, so they have high crystallinity and strong crystallization ability. Due to the high crystallinity of polyoxymethylene, polyoxymethylene is endowed with high rigidity, fatigue resistance, wear resistance, excellent dielectric properties, low friction coefficient, creep tendency, and has "super steel" and "sai steel" Wait for the reputation. Therefore, polyoxymethylene is widel...

Claims

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Application Information

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IPC IPC(8): C08L59/04C08L33/12C08L33/06C08L35/06C08L67/02C08K13/02C08K3/22C08K3/04B29B9/06B29C47/92B29C48/92
Inventor 王亚涛李建华郭学华杨大志马小丰汪晓东陶兆增武德珍
Owner KAILUAN ENERGY CHEM
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