Double-base synergistic flame-retardant polyformaldehyde composite material and preparation method thereof

A technology of composite materials and polyoxymethylene, which is applied in the field of phosphaphenanthrene and polyphosphazene double base synergistic flame-retardant polyoxymethylene composite materials and its preparation, can solve the problem of decreased mechanical properties and poor compatibility of polymer matrix or reinforced materials and other issues, to achieve excellent interfacial compatibility, flame retardant performance and interfacial cohesion enhancement, and excellent flame retardant performance

Inactive Publication Date: 2020-06-02
KANGMINGYUAN GUIZHOU SCI & TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, DOPO flame retardants also have their shortcomings. The compatibility between this type of flame retardant and the polymer matrix or reinforcement material is poor, so that when this type of flame retardant is used, it will cause the mechanical properties of the polymer matrix or reinforcement material. Performance drop

Method used

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  • Double-base synergistic flame-retardant polyformaldehyde composite material and preparation method thereof
  • Double-base synergistic flame-retardant polyformaldehyde composite material and preparation method thereof
  • Double-base synergistic flame-retardant polyformaldehyde composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for preparing a double-base synergistic flame-retardant polyoxymethylene composite material, comprising the following steps:

[0030] S1, 90kg of polyoxymethylene, 2.5kg of reactive phosphaphenanthrene, 2.5kg of reactive polyphosphazene, 5kg of styrene-acrylonitrile grafted glycidyl methacrylate and 0.5kg of bis(2,4 - Dicumylphenyl) pentaerythritol diphosphite was dried at 80° C. and then mixed to obtain a mixture. The drying time is 1-4h, until there is no obvious moisture.

[0031] S2. The mixture in step S1 is blended and extruded through a twin-screw extruder at 160-175 ° C, and then cooled to room temperature, followed by traction and pelletizing to obtain polylactic acid, phosphaphenanthrene and polyphosphorus Nitrile double base synergistic flame retardant composite material.

[0032] Described vapor phase flame retardant is reactive type phosphaphenanthrene, (DOPO) 2 -P-PPD-PH), the structure of which is shown below.

[0033]

Embodiment 2

[0035] The difference from Example 1 is that in step S1, 1.5 kg is used for the gas phase flame retardant, and 1.5 kg is used for the condensed phase flame retardant.

Embodiment 3

[0050] A method for preparing a double-base synergistic flame-retardant polyoxymethylene composite material, comprising the following steps:

[0051] S1, 80kg of polyoxymethylene, 2kg of reactive phosphaphenanthrene, 2kg of reactive polyphosphazene, 5kg of polyethylene grafted glycidyl methacrylate and 0.5kg of bis(2,4-dicumylbenzene Base) pentaerythritol diphosphite was dried at 75°C and then mixed to obtain a mixture. The drying time is 1-4h, until there is no obvious moisture.

[0052] S2. The mixture in step S1 is blended and extruded through a twin-screw extruder at 160-175 ° C, and then cooled to room temperature, followed by traction and pelletizing to obtain polylactic acid, phosphaphenanthrene and polyphosphorus Nitrile double base synergistic flame retardant composite material.

[0053] Described vapor phase flame retardant is reactive type phosphaphenanthrene, (DOPO) 2 -P-PPD-PH), the structure of which is shown below.

[0054]

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Abstract

The invention discloses a double-base synergistic flame-retardant polyformaldehyde composite material. The composite material comprises, by mass, 80-95 parts of polyformaldehyde, 2-5 parts of a gas-phase flame retardant, 2-5 parts of a condensed-phase flame retardant, 5-10 parts of a compatibilizer and 0.5 part of an antioxidant. A preparation method of the composite material comprises the following steps: S1, drying polyformaldehyde, the gas-phase flame retardant, the condensed-phase flame retardant, the compatibilizer and the antioxidant at 75-85 DEG C, and uniformly mixing to obtain a mixture; and S2, carrying out blending extrusion processing on the mixture obtained in step S1 through a double-screw extruder at 160-175 DEG C, cooling to room temperature, and sequentially carrying out traction and dicing to obtain the phosphaphenanthrene and polyphosphazene double-base synergistic flame-retardant polyformaldehyde composite material. The modified polyformaldehyde material has the advantages of favorable flame retardancy, favorable compatibility between the flame retardant and a matrix and favorable mechanical properties. In addition, the preparation method is simple.

Description

technical field [0001] The invention belongs to the field of polyoxymethylene composite materials, and in particular relates to a double-base synergistic flame-retardant polyoxymethylene composite material of phosphaphenanthrene and polyphosphazene and a preparation method thereof. Background technique [0002] Polyoxymethylene is a linear polymer with no side chains, high density and high crystallinity. It has excellent comprehensive properties and is used in the fields of electronics, machinery, instrumentation, daily light industry, automobiles, building materials, and agriculture. But polyoxymethylene is easy to burn. The halogen-containing flame retardants used in polyoxymethylene resins are mainly polybrominated biphenyl compounds. This type of halogen-containing flame retardants has a good flame-retardant effect in polyoxymethylene materials, but the halogen-containing flame retardants will burn or process at high temperatures. Gives off toxic and corrosive gases and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L59/02C08L85/02C08L51/00C08K5/5397C08K5/527C08L51/06C08K5/5398
CPCC08L59/02C08L2201/02C08L2205/03C08L85/02C08L51/003C08K5/5397C08K5/527C08L51/06C08K5/5398
Inventor 王华周成立
Owner KANGMINGYUAN GUIZHOU SCI & TECH DEV CO LTD
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