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Halogen-free expansible flame-retardant thermoplastic resin composition

A technology of thermoplastic resin and intumescent flame retardant, which is applied in the field of flame retardant thermoplastic resin, can solve the problems of poor thermal stability, large amount of addition, poor resin compatibility, etc., and achieve excellent processing performance, enhanced mechanical properties, and good flame retardancy performance effect

Inactive Publication Date: 2010-08-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, resins flame-retardant by halogen-antimony-based flame retardants will release a large amount of toxic and corrosive gases when burning, such as hydrogen halides, dioxins and other highly toxic substances, which seriously pollute the environment and endanger human health. Even if it is not burned, its recycling and disposal will cause problems for the environment. In view of this, many countries and regions represented by the European Union have issued laws and regulations to prohibit the production and use of such flame retardants and their corresponding flame-retardant products.
However, aluminum hydroxide, magnesium hydroxide, etc., which are inorganic hydroxide flame retardants, have a large amount of addition (usually 50-60% to meet the flame-retardant requirements), and poor compatibility with resins, thus affecting the mechanical properties of the material. etc. have a great influence
Although phosphorus-containing flame retardants such as red phosphorus have a good flame-retardant effect on polyamide 6 and polyamide 66, they have disadvantages such as poor thermal stability and dark colors that cannot be used to obtain light-colored products.
In addition, melamine polyphosphate, etc. also have a certain flame-retardant effect on polyamide 6 and polyamide 66, but when used alone, the addition amount is large, which has a relatively large impact on the mechanical properties of the material.
At the same time, due to the "wick effect" of glass fiber reinforced products of polyamide 6 and polyamide 66, their flame retardancy is even worse, which makes the flame retardancy of glass fiber reinforced polyamide a difficult point in the field of flame retardancy
The flame retardant research reports on polylactic acid are also mainly concentrated on halogenated flame retardants, inorganic hydroxide flame retardants, and phosphate esters (salts), which also have disadvantages such as high toxicity and large additions.

Method used

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  • Halogen-free expansible flame-retardant thermoplastic resin composition
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  • Halogen-free expansible flame-retardant thermoplastic resin composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] First put 24% ammonium polyphosphate and char-forming agent CA1 (mass ratio 5:1) into a high-speed mixer and mix evenly, then add 1% di(dioctylpyrophosphoryloxy)isopropyl titanate The coupling agent continues to mix uniformly in the high-speed mixer; the flame retardant mixture after vacuum drying, 74% polyamide 6 and 1% composite antioxidant (the mass ratio of antioxidant 1010 and 168 is 1: 1) is mixed After uniformity, put it into a twin-screw extruder to melt, blend and extrude, then cool naturally and cut into pellets.

[0048] The LOI of the obtained halogen-free intumescent flame-retardant polyamide 6 composition was 29.0, and the vertical combustion was rated as V-0.

Embodiment 2

[0050] First, put 22% of inorganic aluminum hypophosphite (average particle size less than 20 μm, maximum particle size less than 50 μm) and carbon forming agent CA1 (mass ratio: 1:1) into a high-speed mixer and mix evenly; vacuum-dry the flame retardant The mixture, 5% organically modified montmorillonite (OMMT), 72% polyamide 6 and 1% composite antioxidant (the mass ratio of antioxidant 1010 and 168 is 4:1) were mixed evenly, and put into the double After melt blending and extruding in a screw extruder, it is naturally cooled and cut into pellets.

[0051] The LOI of the obtained halogen-free intumescent flame-retardant polyamide 6 composition was 30.5, and the vertical combustion was rated as V-0.

Embodiment 3

[0053] First put 18% of inorganic aluminum hypophosphite and charcoal agent CA1 (mass ratio 1:1) into a high-speed mixer and mix evenly, then add 2% of γ-diethylenetriaminopropyltriethoxysilane The coupling agent continues to mix uniformly in the high-speed mixer; the flame-retardant mixture after vacuum drying, 49.5% polyamide 6 and 0.5% composite antioxidant (the mass ratio of antioxidant 1010 and 168 is 1: 1) is mixed uniformly Finally, it is fed into the main feeding port of the twin-screw extruder, and 30% E-glass fiber is fed into the side feeding port after vacuum drying, and then melted, blended and extruded, and then naturally cooled and cut into pellets.

[0054] The LOI of the obtained halogen-free intumescent flame-retardant glass fiber reinforced polyamide 6 composition is 30.5, and the vertical burning is V-0 grade.

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Abstract

The invention discloses a halogen-free expansible flame-retardant thermoplastic resin composition, which is prepared by fusing and blending the following components in percentage by weight: 40 to 80 percent of thermoplastic resin, 18 to 25 percent of halogen-free expansible flame retardant, 0 to 5 percent of flame-retardant synergetic agent, 0 to 30 percent of glass fiber, 0 to 2 percent of coupling agent and 0.5 to 1 percent of antioxidant, wherein the thermoplastic resin is any one of polyamide 6, polyamide 66 and polylactic acid or glass fiber reinforced product thereof. The halogen-free expansible flame retardant in the flame-retardant thermoplastic resin composition has low additive amount and good flame retardancy, and the compound flame-retardant synergetic agent does not affect various inherent properties of the resin and can improve the flame retardancy of the material and reduce the cost of the material so as to fill the blank that the prior art has no thermoplastic resin compositions of halogen-free expansible flame-retardant polyamide, polylactic acid and the like.

Description

technical field [0001] The invention belongs to the technical field of flame-retardant thermoplastic resins, and in particular relates to a high-efficiency halogen-free intumescent flame-retardant thermoplastic resin composition, including halogen-free intumescent flame-retardant polyamide 6 (PA6), polyamide 66 (PA66), polylactic acid ( PLA) and their glass fiber reinforced products. Background technique [0002] Polyamide and polylactic acid are two typical classes of thermoplastic resins. Polyamide is commonly known as nylon (Nylon), English name Polyamide (PA), polyamide 6 and polyamide 66 are two of the most important varieties. Although they have become the preferred materials for the electrical and electronic industry and the automotive industry because of their good mechanical properties, chemical resistance, oil resistance, and good electrical insulation, but because these fields now require high flame retardancy, polymers The flame retardancy of amide and its glas...

Claims

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Application Information

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IPC IPC(8): C08L77/02C08L77/06C08L67/04C08K13/06C08K3/32C08K5/3492C08K7/14
Inventor 王玉忠赵斌赵婧魏连连陈力刘云
Owner SICHUAN UNIV
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