Chain-extended modified and copolymerized formaldehyde resin and preparation method thereof

A formaldehyde resin and modification technology, which is applied in the field of chain-extended modified polyoxymethylene resin and its preparation, can solve the problems of restricting the application field of polyoxymethylene copolymer, difficulty in realizing industrial production, and harsh control conditions, etc., so as to enrich the variety of polyoxymethylene resin, Reduce the melt index and implement the effect of convenience

Inactive Publication Date: 2012-07-11
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This undoubtedly limits the application field of polyoxymethylene copolymer, especially in blow molding, pipe extrusion and other processing methods and fields that require high resin viscosity
U.S. Patent No. 5,458,839 prepares linear high-molecular-weight polyoxymethylene by controlling the polymerization process conditions, but it is difficult to realize industrial production due to the complex process and harsh control conditions

Method used

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  • Chain-extended modified and copolymerized formaldehyde resin and preparation method thereof
  • Chain-extended modified and copolymerized formaldehyde resin and preparation method thereof
  • Chain-extended modified and copolymerized formaldehyde resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Copolyoxymethylene (MI: 27g / 10min) 10Kg, 4,4'-diphenylmethane diisocyanate (MDI) 100g, tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid ]Pentaerythritol ester 10g, calcium stearate 10g, melamine 20g, glycerol monostearate 10g are uniformly mixed and then melted and extruded by a vented twin-screw extruder at an extrusion temperature of 180°C to 220°C and a screw speed of 100 After granulation, dry at 80°C for 3 hours to obtain a chain-extended modified polyoxymethylene resin.

Embodiment 2

[0025] Copolyoxymethylene (MI: 27g / 10min) 10Kg, 4,4'-diphenylmethane diisocyanate (MDI) 200g, tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid ] 30g of pentaerythritol ester, 30g of magnesium hydroxide, 40g of melamine, and 10g of bisstearamide are evenly mixed and then melted and extruded by a vented twin-screw extruder. The extrusion temperature is 180°C to 220°C, and the screw speed is 100 rpm , After granulation, dry at 80°C for 3 hours to obtain a chain-extended modified polyoxymethylene resin.

Embodiment 3

[0027] Copolyoxymethylene (MI: 27g / 10min) 10Kg, 4,4'-diphenylmethane diisocyanate (MDI) 500g, β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate octadecanoic acid Carbon alcohol ester 50g, calcium stearate 50g, polyamide PA650g, glyceryl monostearate 50g are uniformly mixed and then melted and extruded by vented twin-screw extruder, the extrusion temperature is 180℃~220℃, the screw speed 100 rpm, after granulation, dry at 80°C for 3 hours to obtain chain extension modified polyoxymethylene resin.

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Abstract

The invention discloses chain-extended modified and copolymerized formaldehyde resin and a preparation method thereof. The resin mainly comprises polyoxymethylene, polyfunctional isocyanate chain extender, antioxidant, formic acid absorbent, formaldehyde absorbent, lubricant, and the like. The chain-extended modified and copolymerized formaldehyde resin is characterized in that a polyfunctional isocyanate compound is adopted as the chain extender, isocyanate is utilized to react with a compound containing active hydrogen and a melt extrusion manner is adopted, so that the polyfunctional isocyanate and terminal hydroxyl of different molecular chains of the copolymerized formaldehyde are enabled to directly conduct a chain-extending reaction in the extrusion process, thereby increasing the molecular weight of the formaldehyde and achieving the aims of reducing a melt index and increasing the resin viscosity. After the copolymerized formaldehyde resin is melt-extruded to realize chain extension, a resin variety with a melt index within a range of 0.5 to 27g/10min, particularly a copolymerized formaldehyde resin variety with a low melt index below 2.5g/10min and high viscosity can be obtained.

Description

technical field [0001] The invention relates to a modification technology of polyoxymethylene resin, more specifically, relates to a modified polyoxymethylene resin with chain extension and a preparation method thereof. Background technique [0002] Polyoxymethylene (POM) is a molecular backbone composed of oxymethylene [-CH 2 O-] repeating units of linear, high melting point, high density, high crystallinity thermoplastic engineering plastics. Polyoxymethylene resin has excellent rigidity and mechanical strength, good dimensional stability of products, and excellent water resistance, oil resistance, chemical resistance and wear resistance. Polyoxymethylene is one of the varieties of plastics whose mechanical properties are closest to metals, and can replace non-ferrous metals such as zinc, brass, and aluminum as engineering structural materials. It can be used for a long time at -40 ~ 100 ℃, and has good fatigue resistance. Therefore, it is widely used in the fields of m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L59/04C08L77/02C08L77/06C08K5/29C08K5/3492C08K5/098C08K3/22
Inventor 杨锋蔡燎原蓝方曹亚曾伟向明
Owner SICHUAN UNIV
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