Polyformamine treatment thermal stabilizing method

A technology of thermal stabilization and formaldehyde amine, applied in the field of thermal stabilization of polyoxymethylene amine treatment, can solve the problems of increasing the amount of formaldehyde, increasing the process of cleaning, purifying and drying POM, and the surface deterioration of molded products.

Inactive Publication Date: 2007-01-10
YUNNAN YUNTIANHUA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN1196073A discloses that the existing POM resin cannot meet the thermal stability requirements, and deposits are produced on the mold, which deteriorates the surface of the molded product. The reason is that the POM resin is oxidized and decomposed due to a small amount of oxygen during molding, which increases the The amount of formaldehyde decomposed, because the generated formaldehyde

Method used

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  • Polyformamine treatment thermal stabilizing method
  • Polyformamine treatment thermal stabilizing method
  • Polyformamine treatment thermal stabilizing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Example 1 POM 10Kg, triethylamine 100g, water 100g, tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol 10g, magnesium oxide 5g, bis stearamide Mix 20g evenly, melt and knead with a vented twin-screw extruder, extrude and granulate. The barrel temperature of the extruder is 170-220°C, the screw speed is 40 rpm, and dried at 90°C for 3 hours.

Embodiment 2

[0059] POM 10Kg, triethanolamine 5g, water 600g, bis[3-(3-tert-butyl-5-methyl-4-hydroxyphenyl) triethylene glycol propionate 50g, calcium silicate 30g, pentaerythritol tris Stearic acid ester 5g is mixed evenly, adopts exhaust type twin-screw extruder to melt kneading, extrudes granulation. The barrel temperature of the extruder is 140-190° C., the screw speed is 90 rpm, and dried at 80° C. for 5 hours.

Embodiment 3

[0061] POM 10Kg, ammonia water (27wt%) 1000g, N,N'-hexylidene bis(3,5-di-tert-butyl-4-hydroxyl-hydrocinnamic amide) 50g, calcium carbonate 50g, glycerol monostearate 10g Mix evenly, use a vented twin-screw extruder to melt and knead, and extrude to granulate. The barrel temperature of the extruder is 150-220° C., the screw speed is 150 rpm, and it is dried at 90° C. for 3 hours.

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PUM

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Abstract

This invention relates to a thermal-stabilizing method for paraformaldehyde-amine including: mixing paraformaldehyde with the melt index 9~27g/10min of 100 amounts by weight, antioxidants 0.1~0.5 of amounts by weight, formic acid absorber of 367 amounts by weight, lubricant of 367 amounts by weight, amine compounds of 0.05 amounts by weight and water of 1-10 amounts by weight, then melt-mixing the mixture in the exhaust twin-screw extruder, extruding the materials in the form of granulation and the temperature of the barrel extruder is set at 140~220 deg. C, screw speed is set at 30 - 180 rpm, the materials are dried for 3~5h at 80-90deg.C or mixing the paraformaldehyde, antioxidants, formic acid absorber and lubricant, then extruding the materials in the form of granulation, feeding amide solution in the feeding throat of the extruder at the same time and the melt temperature, screw speed, drying process are the same with the former.

Description

technical field [0001] The invention relates to a method for thermally stabilizing polyformaldehyde amine, which belongs to the field of polymer processing. Background technique [0002] Polyoxymethylene (POM) is [-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 special molecular structure of POM, its thermal stability is poor, so the thermal stabilization of POM is the most important and basic key technology in its synthesis or processing application. Yu Jian et al., Application of Engineering Plastics...

Claims

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Application Information

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IPC IPC(8): C08L59/02C08K5/20B29C47/40B29B9/12C08K5/103C08K5/17C08K3/26C08K3/32
Inventor 叶林孙天举
Owner YUNNAN YUNTIANHUA
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