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Low-corrosion and low-formaldehyde-release polyformaldehyde composition and preparation method and application thereof

A technology of composition and formaldehyde, applied in the field of low-corrosion and low-formaldehyde-releasing polyoxymethylene composition and its preparation, can solve the problems of POM resin discoloration, inability to significantly suppress, poor long-term acid removal effect, etc., to avoid discoloration, Good absorption of formic acid

Active Publication Date: 2015-07-15
CHINA NAT OFFSHORE OIL CORP +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The formic acid absorbers reported in Chinese patent CN1256381C and CN101357973A are all alkaline earth metal carboxylates, alkaline earth metal oxides and hydroxides thereof, but there are also problems such as poor long-term acid removal effect and discoloration of POM resin
However, increasing the amount of traditional formaldehyde absorbents (such as melamine, etc.) alone cannot significantly suppress the generation of free formaldehyde during the processing of polyoxymethylene, and will bring about negative effects such as discoloration and emigration.

Method used

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  • Low-corrosion and low-formaldehyde-release polyformaldehyde composition and preparation method and application thereof

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Effect test

Embodiment 1

[0065] Add 100 parts by weight of polyoxymethylene copolymer resin, 0.2 parts by weight of organic formaldehyde absorbent, 0.2 parts by weight of inorganic formaldehyde / formic acid absorbent, 0.6 parts by weight of antioxidant, 0.15 parts by weight of lubricant and 0.2 parts by weight of crystallization nucleating agent into a high-speed mixer Pre-mixing in the middle, and then use a twin-screw extruder for melt mixing and extrusion granulation, the processing temperature is 170 ° C, 200 ° C, 220 ° C and 230 ° C, the residence time of each temperature is not more than 5s, the screw speed It is 120r / min. The used twin-screw extruder belongs to the large-capacity evaporation (multi-stage exhaust) devolatilization twin-screw unit, the aspect ratio is 44, and the vacuum degree of each exhaust section of the twin-screw extruder is -0.07MPa during operation.

[0066] The melt index of polyoxymethylene resin used in this embodiment is 9.0g / 10min, and the weight percent content of dio...

Embodiment 2

[0073] Add 100 parts by weight of polyoxymethylene copolymer resin, 0.7 parts by weight of organic formaldehyde absorbent, 0.9 parts by weight of new inorganic formaldehyde / formic acid absorbent, 0.8 parts by weight of antioxidant, 0.6 parts by weight of lubricant and 0.1 part by weight of crystallization nucleating agent into the high-speed Pre-mixing in the mixer, and then using a twin-screw extruder for melt mixing and extrusion granulation, the processing temperature is 160 ° C, 215 ° C, 230 ° C and 240 ° C, the residence time of each temperature is not more than 5s, the screw The rotating speed is 20r / min. The twin-screw extruder used is a large-capacity evaporation (multi-stage exhaust) devolatilization twin-screw unit with an aspect ratio of 15, and the vacuum degree of each exhaust section of the twin-screw extruder is -0.08MPa during operation.

[0074] The melt index of polyoxymethylene resin used in this embodiment is 2.5g / 10min, and the weight percent content of di...

Embodiment 3

[0081] Add 100 parts by weight of polyoxymethylene copolymer resin, 3 parts by weight of organic formaldehyde absorbent, 2.5 parts by weight of new inorganic formaldehyde / formic acid absorbent, 2 parts by weight of antioxidant, 1.5 parts by weight of lubricant and 1 part by weight of crystallization nucleating agent into the high-speed Pre-mixing in the mixer, and then using a twin-screw extruder for melt mixing and extrusion granulation, the processing temperature is 175 ° C, 210 ° C, 230 ° C and 245 ° C, the residence time of each temperature is not more than 5s, the screw The rotating speed is 400r / min. The used twin-screw extruder belongs to the large-capacity evaporation (multi-stage exhaust) devolatilization twin-screw unit, the aspect ratio is 65, and the vacuum degree of each exhaust section of the twin-screw extruder is -0.09MPa during operation.

[0082] The melt index of polyoxymethylene resin used in this embodiment is 27.0g / 10min, and the weight percent of dioxola...

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Abstract

The invention discloses a low-corrosion and low-formaldehyde-release polyformaldehyde composition and a preparation method and an application thereof. The composition includes copolymerized polyformaldehyde resin, an organic formaldehyde absorbent, an inorganic formaldehyde and formic acid absorbent, an antioxidant, a lubricant and a crystallization nucleating agent. The composition can be used in application occasions having extremely harsh requirements on the formaldehyde release amount and corrosivity, avoids the problems of discoloration, volatilization and emigration brought by a traditional formaldehyde absorbent, and besides, also has an excellent effect on absorbing formic acid; and the preparation method is simple and convenient to operate, and is quite easily applied to the polyformaldehyde technical field.

Description

technical field [0001] The invention belongs to the technical field of polymer material modification technology and processing technology, and relates to a polyoxymethylene composition with low corrosion and low formaldehyde release, a preparation method and application thereof. Background technique [0002] Polyoxymethylene (POM) is one of the five major engineering plastics. It has excellent properties such as high strength, high modulus, self-lubrication, and friction resistance. It is more and more widely used in electronics, mechanical transmission, automobile industry, and daily chemical industry. However, polyoxymethylene has poor thermal stability and is also corrosive to processing equipment. Formic acid is the main cause of equipment corrosion during the processing of polyoxymethylene, and formic acid will reduce the thermal stability of polyoxymethylene resin at the same time. During the synthesis and processing of polyoxymethylene, under the combined action of h...

Claims

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Application Information

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IPC IPC(8): C08L59/04C08K13/02C08K3/22C08K5/315C08K5/3492C08K5/134C08K3/34C08K3/26C08K3/36B29C47/92B29C48/92
Inventor 王亮亮周涛操斌杨文峰商亚东吕纯泰张爱民付玉娥陈科宇王志伟吴桂波王岩
Owner CHINA NAT OFFSHORE OIL CORP
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