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Reinforced and toughened polyformaldehyde and preparation method thereof

A technology of strengthening and toughening polyoxymethylene, applied in the field of strengthening and toughening polyoxymethylene and its preparation, can solve the problems of increasing the impact toughness of POM, weakening the toughening effect, and reducing the mechanical strength, so as to improve the overall performance and enhance the interface interaction , the effect of large aspect ratio

Active Publication Date: 2012-09-19
YANKUANG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor thermal stability of thermoplastic polyurethane elastomers, molding at higher temperatures (>200°C) can easily cause its molecular degradation, thereby weakening its toughening effect
On the other hand, although a higher amount of polyurethane elastomer can significantly increase the impact toughness of POM, it will lead to a significant decrease in its mechanical strength; the improvement of its comprehensive mechanical properties by using granular fillers is not obvious

Method used

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  • Reinforced and toughened polyformaldehyde and preparation method thereof
  • Reinforced and toughened polyformaldehyde and preparation method thereof
  • Reinforced and toughened polyformaldehyde and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Preparation of reinforced and toughened polyoxymethylene

[0027] Mix 10Kg of POM resin with 30g of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, 20g of melamine, 20g of calcium carbonate, 2Kg of thermoplastic polyester elastomer, surface treatment hydroxylation Add 100 g of multi-walled carbon nanotubes and 10 g of glycerol monostearate into a high-speed mixer for mixing, then melt and knead with a vented twin-screw extruder, extrude and granulate, and obtain reinforced and toughened polyoxymethylene, wherein, The screw speed is 50 rpm; the temperature of each section of the barrel is 140-200°C. The notched impact strength of this product can reach 18KJ / m 2 Around, and maintain a high tensile strength, up to 41MPa.

Embodiment 2

[0028] Example 2 Preparation of reinforced and toughened polyoxymethylene

[0029] Mix 10Kg of POM resin with 40g of N,N'-bis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hexamethylenediamine, 10g of dicyandiamide, 10g of magnesium oxide, thermoplastic polymer Add 3Kg of ester elastomer, 200g of surface-treated carboxylated multi-walled carbon nanotubes, and 20g of bisstearamide into a high-speed mixer for mixing, then melt and knead with a vented twin-screw extruder, extrude and granulate, and then strengthen Toughened polyoxymethylene, wherein, the screw speed is 150 rpm; the temperature of each section of the barrel is 160-220°C. The notched impact strength of this product can reach 25KJ / m 2 Around, and maintain a high tensile strength, up to 45MPa.

Embodiment 3

[0030] Example 3 Preparation of reinforced and toughened polyoxymethylene

[0031] Mix 10Kg of POM resin with 10g of β-(4-hydroxy-3,5-di-tert-butylphenyl) octadecyl propionate, 70g of urea, 7g of calcium silicate, 2.5Kg of thermoplastic polyester elastomer, surface treated hydroxyl 400g of multi-walled carbon nanotubes and 30g of pentaerythritol tristearate are added in a high-speed mixer and mixed, then melted and mixed with a vented twin-screw extruder, extruded and granulated, to obtain reinforced and toughened polyoxymethylene, wherein , Screw speed, 100 rpm; barrel temperature, 170 ~ 210 ℃. The notched impact strength of this product can reach 18KJ / m 2 Around, and maintain a high tensile strength, up to 42MPa.

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Abstract

The invention discloses reinforced and toughened polyformaldehyde, which is prepared from the following components through a preparation method comprising the following steps: adding 10 parts of POM (polyoxymethylene) resin, 0.1-0.3 part of antioxidant, 0.05-2 parts of formaldehyde absorber, 0.05-0.5 part of formic acid absorber, 15-30 parts of thermoplastic polyester elastomer, 0.05-5 parts of functionalized multi-wall carbon nano tube subjected to surface treatment and 0.05-0.5 part of lubricant into a high-speed mixer and mixing, melting and mixing by an exhaust type double-screw extruder, extruding and pelleting to obtain the reinforced and toughened polyformaldehyde, wherein a rotating speed of screws is 50-200 revolutions per minute, and temperature of a charging barrel is 140-220 DEG C. The thermoplastic polyester elastomer with higher heat stability and excellent strength and toughness is adopted, and the functionalized multi-wall carbon nano tube with higher length-diameter ratio and better compatibility with a POM matrix, is composited with the POM so as to realizing reinforcing and toughening for the POM, so that a notch impact strength of the polyformaldehyde reaches about 25 KJ / m<2>, and a higher tensile strength is kept and reaches 41-45 MPa.

Description

technical field [0001] The invention relates to a reinforced and toughened polyoxymethylene and a preparation method thereof, belonging to the field of polymer material processing. Background technique [0002] Polyoxymethylene (POM) is based on [-CH 2 -O-] main chain, unbranched, high melting point, high density, high crystalline thermoplastic engineering plastics, with high strength and rigidity, excellent creep resistance, fatigue resistance, inherent lubricity, wear resistance It is the closest to metal in engineering plastics, and can be used to replace copper, aluminum, zinc and other non-ferrous metals and alloy products. It is widely used in electronics, automobiles, light industry, machinery, chemicals, building materials, etc. field. [0003] Due to the high crystallinity of POM, the high notch sensitivity, and the residual internal stress of the product, the toughening modification of POM has always been a topic of concern to the polymer academic and industrial ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L59/00C08L67/00C08K13/06C08K9/06C08K9/04C08K7/00C08K5/3492C08K5/31C08K5/21C08K5/25C08K3/22C08K3/34C08K5/521C08K3/26C08K5/103C08K5/20
Inventor 娄兰亭叶林叶盛芳赵晓文张钊李政秋何闯候世荣张海松
Owner YANKUANG GRP CO LTD
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