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Thermo-oxidative aging resistant polyformaldehyde

A polyoxymethylene and homopolyoxymethylene technology, applied in the field of polyoxymethylene, can solve the problems of easy migration and precipitation, and achieve the effects of avoiding excessive reduction in strength, slowing down the acceleration effect, and improving the toughness of polyoxymethylene.

Pending Publication Date: 2021-04-30
甘肃泰尔精细化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that existing formaldehyde absorbents are generally small molecular substances such as melamine and 2-imidazolidinone, which are prone to migration or even precipitation after long-term use, the invention discloses a heat-resistant oxygen aging polyoxymethylene. The modifier used to modify nano-silica contains 2-imidazolidinone. This structure acts as a formaldehyde absorber and nano-silica medium, which can be better anchored in the system and play a long-term role.

Method used

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Examples

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Effect test

Embodiment 1

[0025] Preparation of modified nano-silica: Add 3 parts of heat-resistant oxygen aging modifier into ethanol aqueous solution (720 parts of ethanol, 80 parts of water) for ultrasonic dispersion for 20 minutes, then add 100 parts of nano-silica to disperse evenly, and stir for 1 hour. Filtration, washing, blast drying at 50°C for 8 hours, and vacuum drying at 40°C for 24 hours to obtain modified nano-silica.

[0026] Preparation of polyoxymethylene: take 100 parts of Shenhua MC90 polyoxymethylene, 2 parts of modified nano-silica, 10 parts of TPU, 0.6 part of antioxidant 1010, 0.5 part of polyethylene wax, mix in a high-speed mixer at 500r / min for 20min, and then turn Put it into a twin-screw extruder for melt blending, the screw speed is 350r / min, and the temperature of each section from the barrel to the head is set to 165°C, 170°C, 175°C, 180°C, 180°C, 180°C, 180°C, 180°C, 180°C, head temperature is 180°C, cooling, drying, pelletizing and sieving after extrusion to obtain pol...

Embodiment 2

[0028] Preparation of modified nano-silica: Add 3 parts of heat-resistant oxygen aging modifier into ethanol aqueous solution (720 parts of ethanol, 80 parts of water) for ultrasonic dispersion for 20 minutes, then add 100 parts of nano-silica to disperse evenly, and stir for 1 hour. Filtration, washing, blast drying at 50°C for 8 hours, and vacuum drying at 40°C for 24 hours to obtain modified nano-silica.

[0029] Preparation of polyoxymethylene: Take 80 parts of Shenhua MC90 polyoxymethylene, 0.5 part of modified nano-silica, 8 parts of TPU, 0.2 part of antioxidant 1010, 0.1 part of polyethylene wax, mix in a high-speed mixer at 400r / min for 20min, and then transfer to Put it into a twin-screw extruder for melt blending, the screw speed is 350r / min, and the temperature of each section from the barrel to the head is set to 165°C, 170°C, 175°C, 180°C, 180°C, 180°C, 180°C, 180°C, 180°C, head temperature is 180°C, cooling, drying, pelletizing and sieving after extrusion to obta...

Embodiment 3

[0031] Preparation of modified nano-silica: Add 3 parts of heat-resistant oxygen aging modifier into ethanol aqueous solution (720 parts of ethanol, 80 parts of water) for ultrasonic dispersion for 20 minutes, then add 100 parts of nano-silica to disperse evenly, and stir for 1 hour. Filtration, washing, blast drying at 50°C for 8 hours, and vacuum drying at 40°C for 24 hours to obtain modified nano-silica.

[0032] Preparation of polyoxymethylene: take 90 parts of Shenhua MC90 polyoxymethylene, 3 parts of modified nano-silica, 9 parts of TPU, 0.7 part of antioxidant 168, and 0.3 part of polyethylene wax, mix them in a high-speed mixer at 800r / min for 10min, and then transfer to Put it into a twin-screw extruder for melt blending, the screw speed is 350r / min, and the temperature of each section from the barrel to the head is set to 165°C, 170°C, 175°C, 180°C, 180°C, 180°C, 180°C, 180°C, 180°C, head temperature is 180°C, cooling, drying, pelletizing and sieving after extrusion ...

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Abstract

The invention belongs to the technical field of polyformaldehyde, and particularly relates to thermo-oxidative aging resistant polyformaldehyde which comprises the following components in parts by weight: 100 parts of polyformaldehyde, 0.5-10 parts of modified nano silicon dioxide, 8-15 parts of a flexibilizer, 0.2-1 part of an antioxidant and 0.1-0.5 part of a lubricant. In the thermo-oxidative aging resistant polyformaldehyde, the modifier used for modifying the nano silicon dioxide contains 2-imidazolidone, and the structure can be better anchored in a system to play a role for a long time as a formaldehyde absorbent and a nano silicon dioxide medium.

Description

technical field [0001] The invention belongs to the technical field of polyoxymethylene, and in particular relates to a heat-resistant oxygen aging polyoxymethylene. Background technique [0002] Polyoxymethylene (POM), also known as acetal resin, polyoxymethylene, polyacetal, is a thermoplastic crystalline polymer, because its molecular chain has a very high degree of regularity, it is the mechanical properties of polyoxymethylene, Abrasion resistance, creep resistance, chemical corrosion resistance, water resistance, etc. are very beneficial, and it is known as "super steel" or "race steel". However, just because of the very high degree of regularity, the crystallinity of polyoxymethylene is as high as 80-90%, resulting in low notched impact strength and poor toughness of polyoxymethylene. In order to improve the toughness and aging resistance of polyoxymethylene materials, it is usually necessary to add additional plasticizers to improve the thermal properties of polyoxy...

Claims

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Application Information

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IPC IPC(8): C08L59/02C08L59/04C08L75/04C08L23/06C08K9/06C08K3/36C08K5/134C08K5/526C08K5/544
CPCC08L59/02C08L59/04C08K2201/011C08L2201/08C08L2205/03C08L2205/24C08L75/04C08L23/06C08K9/06C08K3/36C08K5/1345C08K5/526C08K5/544
Inventor 曹洪宇赵悌军周德波董建平冯启夫
Owner 甘肃泰尔精细化工有限公司