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Halogen-free flame-resistant glass fiber reinforced polyformaldehyde composite material and preparation method thereof

A composite material and polyoxymethylene technology, applied in the field of flame-retardant polyoxymethylene composite material and its preparation, can solve the complex preparation process of coated red phosphorus micropowder, accelerate the melting and dripping of polyoxymethylene system, and the scope of application of polyoxymethylene system. Limitation and other problems to achieve the effect of improving thermal stability, avoiding severe degradation, and improving quality

Active Publication Date: 2011-05-18
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the flame retardant of glass fiber reinforced polyoxymethylene system is generally more difficult to flame retard than non-glass fiber reinforced system of polyoxymethylene, the reason is that the glass fiber produces a similar "candle wick" effect, thus accelerating the melting flame dripping and burning of the polyoxymethylene system
There are few reports in the literature on the flame retardancy of glass fiber reinforced polyoxymethylene systems. At present, only US patent 3884867 reports the use of 5-15% coated red phosphorus powder and 1-40% coupling agent pretreated glass fiber and polyoxymethylene. Formaldehyde is compounded to prepare self-extinguishing polyoxymethylene, but due to the dark color of the added red phosphorus, the scope of application of the flame-retardant polyoxymethylene system is greatly limited. In addition, the preparation process of coated red phosphorus micropowder is complicated, which solves the problem to a certain extent. The glass fiber "candle wick" effect problem in the flame retardant glass fiber reinforced polyoxymethylene system, its flame retardant performance can only reach the level of horizontal combustion HB level (self-extinguishing) according to the American standard ASTM D 635-63, so the improvement of its flame retardant performance is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] First put 60 g of melamine, 240 g of type II ammonium polyphosphate with a degree of polymerization of 1000, 5 g of melamine formaldehyde resin, 10 g of silicone oil (number average molecular weight 10000), 10 g of phthalimide and 264 5 g of antioxidant in a high-speed mixer Mix for 2 minutes, then add 470 g of polyoxymethylene and continue mixing for 5 minutes. Then the obtained mixture is added to a twin-screw extruder and melted and extruded at a temperature of 180 ° C. At the same time, 200 g of chopped glass fibers are evenly added to the side feeding port in front of the main feeding port of the extruder, and the extruder rotates at a speed of 30 rpm. , The extrudate was cooled by water, cut into pellets, and dried at 60°C for 4 hours to obtain the flame-retardant composite material pellets. The pellets were injection molded into standard test specimens through an injection molding machine, and the injection molding temperature was 190°C. After testing, the verti...

Embodiment 2

[0036] First, 10 g of melamine, 190 g of type I ammonium polyphosphate with a degree of polymerization of 10, 8 g of thermoplastic phenolic resin, 2 g of melamine formaldehyde resin, 1 g of silicone powder (number average molecular weight 1,500,000), 20 g of succinimide, and phthalamide Imine 10g, antioxidant 245 6g and antioxidant 1010 4g were mixed in a high-speed mixer for 3 minutes, then polyoxymethylene copolymer 649g, POE 45g and ET-TPU 5g were added and mixed for 4 minutes. Then, the obtained mixture is added to a twin-screw extruder and melted and extruded at a temperature of 190°C. At the same time, 50 g of continuous long glass fibers are evenly added to the side feeding port in front of the main feeding port of the extruder, and the extruder rotates at 100 rpm. , The extrudate was cooled by water, cut into pellets, and dried at 80°C for 8 hours to obtain the flame-retardant composite material pellets. The pellets were injection molded into standard test specimens th...

Embodiment 3

[0038] First, 50 g of melamine, 300 g of type II ammonium polyphosphate with a polymer degree of 1500, 50 g of urea-formaldehyde resin, 20 g of silicone rubber (number-average molecular weight 1,000,000), 1 g of bismaleimide, and 1 g of N-phenylmaleimide , Antioxidant 264 4g and antioxidant 719 4g were mixed in a high-speed mixer for 4 minutes, then added homopolyoxymethylene 200g, copolymerized polyoxymethylene 150g, PEO 60g and POE 40g and continued to mix for 6 minutes. Then, the obtained mixture was added to a twin-screw extruder and melted and extruded at a temperature of 195°C. At the same time, 120 g of chopped glass fibers were evenly added to the side feeding port in front of the main feeding port of the extruder, and the extruder rotated at 500 rpm. , The extrudate was cooled by water, cut into pellets, and dried at 90°C for 6 hours to obtain the flame-retardant composite material pellets. Take the pellets and inject them into standard test specimens through an injec...

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Abstract

The invention discloses a halogen-free flame-resistant glass fiber reinforced polyformaldehyde composite material and a preparation method thereof. The preparation method is characterized by comprising the following steps of: firstly and proportionally mixing tripolycyanamide, ammonium polyphosphate, a polymer carbon-forming agent, polysiloxane, an imide compound and a polyformaldehyde heat stabilizer in a high-speed mixer for 2-4 minutes, then adding polyformaldehyde and a flexibilizer to the mixture and continuously mixing for 3-6 minutes; and adding the mixture to a double-screw extruder for melt extrusion at the temperature of 165-200 DEG C, simultaneously adding glass fiber from a side feeding port of the extruder, and then drying a granulated extrudate. The preparation method provided by the invention has the advantages of simple process, lower cost and easiness enforcement; raw materials are easy to obtain; and the prepared halogen-free flame-resistant glass fiber reinforced polyformaldehyde composite material has the advantages of excellent flame resistance and physical property, environmental friendliness, no halogen and wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of flame-retardant polyoxymethylene composite material and its preparation, and in particular relates to a halogen-free flame-retardant glass fiber reinforced polyoxymethylene composite material and a preparation method thereof. Background technique [0002] The structural characteristics of engineering plastic polyoxymethylene (POM) are good molecular chain flexibility, high chain structure regularity, easy crystallization and high crystallinity, which endow it with high hardness, high modulus, good dimensional stability and good thermoelectric properties. , Excellent fatigue resistance, good wear resistance and self-lubricating properties, strong coloring, wide temperature range and many other advantages. However, because the oxygen content in the polyoxymethylene molecule is as high as 53%, the limiting oxygen index is low (only 15%), and it is extremely flammable, thereby greatly limiting its application...

Claims

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Application Information

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IPC IPC(8): C08L59/02C08L59/04C08L83/04C08L61/28C08L61/24C08L61/06C08L23/00C08L71/00C08L75/08C08L75/06C08K13/04C08K7/14C08K5/3492C08K3/32C08K5/3417C08K5/3415B29B9/06B29C47/92B29C48/92
CPCB29B9/14B29B7/46B29B7/72B29B7/7461B29B7/90B29B9/06B29B9/12B29C48/04B29C48/92B29C2948/92561B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895C08J3/12C08J3/20C08J2359/02C08J2461/28C08K5/34922C08K7/14C08L59/02C08L61/28C08L79/085C08L83/04C08L85/02C09K21/14
Inventor 陈英红王琪刘渊于奋飞华正坤
Owner SICHUAN UNIV
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