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End-capped modified polyformaldehyde resin and preparation method thereof

A polyoxymethylene resin and modification technology, which is applied in the field of end-capped modified polyoxymethylene resin and its preparation, can solve the problems of difficult further reduction of end group content and molecular weight reduction, and achieve good end group stabilization effect, end group The effect of reducing content and reducing formaldehyde emission

Inactive Publication Date: 2012-07-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using this method to stabilize the end group, on the one hand, it cannot completely avoid the chain scission of the main chain of polyoxymethylene due to residual catalyst and thermal oxygen degradation, resulting in a decrease in molecular weight.
On the other hand, molecules with broken chains will also form new unstable end groups, which makes it difficult to further reduce the content of unstable end groups.

Method used

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  • End-capped modified polyformaldehyde resin and preparation method thereof
  • End-capped modified polyformaldehyde resin and preparation method thereof
  • End-capped modified polyformaldehyde resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 10Kg of polyoxymethylene powder, 4,4'-diphenylmethane diisocyanate (MDI) 50g, tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid] pentaerythritol ester 10g, Calcium stearate 10g, melamine 10g, and glyceryl monostearate 10g are evenly mixed and then melted and extruded by a vented twin-screw extruder. The extrusion temperature is 180°C-220°C, and the screw speed is 100 rpm. After pelleting, dry at 80°C for 3 hours.

Embodiment 2

[0036] Polyoxymethylene powder 10Kg, 4,4'-diphenylmethane diisocyanate (MDI) 100g, β-(3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate 30g, Calcium hydroxide 20g, melamine 30g, polyamide PA610g, glyceryl monostearate 50g 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 rpm After granulation, dry at 80°C for 3 hours.

Embodiment 3

[0038] 10Kg of polyoxymethylene powder, 4,4'-diphenylmethane diisocyanate (MDI) 200g, tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid] pentaerythritol ester 50g, β-(3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate 5g, magnesium hydroxide 50g, melamine 50g, bis stearamide 30g are uniformly mixed and then extruded by vented twin-screw Extrusion machine melt extrusion, the extrusion temperature is 180 ℃ ~ 220 ℃, the screw speed is 100 rpm, after granulation, it is dried at 80 ℃ for 3 hours.

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PUM

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Abstract

The invention discloses end-capped modified polyformaldehyde resin and a preparation method of the resin. The resin mainly comprises polyformaldehyde, polyfunctional group isocyanate end capping agent, antioxidant, formic acid absorbent, formaldehyde absorbent, lubricating agent and the like. The end-capped modified polyformaldehyde resin is characterized in that isocyanate compounds are used as the end capping agent, polyformaldehyde can directly react with isocyanate group in extrusion process by using the reaction of the isocyanate compounds with the compounds containing active hydrogen and adopting a melt extrusion manner of an exhaust double-screw extruder, so as to form stable carbamic acid ester bonds to carry out end capping on original unstable group ends and newly-generated unstable group ends in the resin, thus reaching a better stabilization effect of end groups, improving heat stability of the resin, being capable of effectively preventing breakage of molecular chains in the end group stabilization process, and being beneficial to keeping resin molecular weight.

Description

technical field [0001] The invention relates to polyoxymethylene resin modification technology, more specifically, relates to a polyoxymethylene resin with end-blocking modification 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. It has the hardness, strength and rigidity similar to metal, and it has good self-lubrication, good fatigue resistance and elasticity in a wide range of temperature and humidity. In addition, it has good chemical resistance sex. With a lower cost than many other engineering plastics, polyoxymethylene is replacing some markets traditionally occupied by metals, such as replacing metals such as zinc, brass, aluminum and steel as engineering structural materials, making engineering equipment components, and widely used in electronics Elect...

Claims

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Application Information

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IPC IPC(8): C08L59/00C08L77/02C08L77/06C08G2/30C08K13/02C08K5/29C08K5/098C08K5/3492C08K3/22
Inventor 杨锋曾伟蔡燎原蓝方曹亚向明
Owner SICHUAN UNIV
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